Artificial groundwater recharge system and method based on roof rainwater collection

Abstract

The present invention proposes an artificial groundwater recharge system and method based on rooftop rainwater collection, and relates to the field of groundwater recharge technology. The system includes a rainwater recovery unit, a rainwater purification unit and a rainwater recharge unit connected in sequence, wherein the rainwater recovery unit is used to collect roof rainwater; the rainwater purification unit is used to purify the collected rainwater, and the rainwater recharge unit is used to input the purified rainwater into the underground aquifer. The present invention constructs a feasible artificial recharge and recharge technology system, which can improve the water quality of recharged rainwater, effectively ensure the quality of groundwater recharge, maintain or improve the recharge efficiency of artificial recharge projects, reduce the risk of blockage, and extend the time for artificial recharge to maintain high-efficiency recharge, thereby increasing the amount of recharged water.

Description

Technical Field

[0001] The invention relates to the technical field of groundwater recharge, and in particular to an artificial groundwater recharge system and method based on roof rainwater collection. Background Art

[0002] Artificial groundwater recharge is an internationally recognized technology for water resource recycling and water quality safety based on a natural-artificial coupling system. It is currently regarded as one of the effective methods to solve problems such as groundwater overexploitation and promote water resource regulation and management. The so-called artificial groundwater recharge means that surface water that is unevenly distributed in time, dispersed in space, and lacks storage space, including river water, rainwater and flood water, upstream reservoir waste water, recycled water, etc., is consciously and purposefully injected into underground aquifers through artificial control to transform it into more stable groundwater.

[0003] Among them, using urban rainwater and flood water to carry out artificial groundwater recharge can effectively replenish groundwater resources, alleviate environmental geological problems such as ground subsidence and seawater intrusion caused by over-exploitation of groundwater, and reduce urban flood control and drainage pressure while realizing the effective utilization of urban rainwater resources. Collecting part of the rainwater directly from the roof and pre-treating it before artificial recharge can not only alleviate the drainage pressure of rainwater and flood water, but also reduce the subsequent treatment pressure because the rainwater on the roof is cleaner than the rainwater on the ground. It is a new idea for the reuse of rainwater and flood water resources that "kills two birds with one stone".

[0004] The solutions adopting this idea in the prior art generally directly use the flat roof of the building as the rainwater collection surface, and the rainwater collection surface is connected to the collection device through a rain pipe. However, there are the following problems: the system fails to achieve the initial rainwater abandonment (the initial rainwater is seriously polluted by suspended particles in the air, dust on the ground, etc. and cannot be directly used, so the initial rainwater needs to be abandoned), the collected rainwater is relatively dirty, and the purification pressure after the rainwater is collected is relatively high.

[0005] Another method is to cast the rainwater unit pool and the building roof as an integral structure, but this structure is suitable for newly built buildings. It is difficult and costly to renovate existing buildings.

[0006] In summary, although the existing rooftop rainwater collection and utilization can be realized, the following problems still exist: 1) The existing rooftop rainwater collection device has high requirements for the rooftop environment, and it is difficult and costly to renovate the already built buildings; 2) There is a lack of rainwater utilization measures that take into account the initial rainwater abandonment and realize water quality classification, which cannot reduce the purification pressure during the subsequent rainwater recharge. Summary of the invention

[0007] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention proposes an artificial groundwater recharge system and method based on roof rainwater collection.

[0008] The technical solution of the present invention to solve the technical problem is:

[0009] On the one hand, the technical solution proposes an artificial groundwater recharge system based on rooftop rainwater collection, comprising a rainwater recovery unit, a rainwater purification unit and a rainwater recharge unit connected in sequence, wherein the rainwater recovery unit is used to collect rooftop rainwater; the rainwater purification unit is used to purify the collected rainwater, and the rainwater recharge unit is used to input the purified rainwater into an underground aquifer; the rainwater recovery unit comprises at least one group of slope surfaces arranged on the flat roof of the building, a water collection trough is arranged below the slope surface, and the water collection trough is connected to the rainwater purification unit arranged on the ground through a rainwater downpipe The water collection tank is a box structure with an opening on the top, and the right side of the water collection tank is a flippable baffle with filter holes on it; the baffle is movably connected to the water collection tank to form a deformable structure that can switch from vertical to horizontal state; the baffle is connected to a driving assembly to realize the flipping of the baffle; when the baffle is in a horizontal state fastened to the top of the water collection tank, a sewage outlet is formed on the right side of the water collection tank to realize the discharge of initial rainwater and the interception and cleaning of garbage; when the baffle is in a vertical state blocking the sewage outlet, the water collection tank forms a water collection tank structure to collect rainwater flowing down from the slope surface.

[0010] Preferably, the rainwater purification unit comprises a regulating tank and a purification tank connected in sequence, a purification layer is arranged in the purification tank, and the purification layers are, from bottom to top, a zeolite gravel layer, a coarse limestone gravel layer, a fine limestone gravel layer, and a quartz sand layer; the purification tank has an inlet pipe and an outlet pipe on both sides, the inlet pipe is connected to the regulating tank, and the outlet pipe is connected to the rainwater recharge unit.

[0011] Preferably, the slope surface is composed of photovoltaic components, and the photovoltaic components include a photovoltaic bracket arranged on the roof, and a photovoltaic panel is installed on the photovoltaic bracket. The photovoltaic panel is inclined, and the upper surface of the photovoltaic panel forms a slope surface for collecting water.

[0012] Preferably, the baffle is movably connected to the water collecting trough through a flip guide, the flip guide includes a flip bracket, a cross beam is provided on the top of the water collecting trough, one end of the flip bracket is rotatably connected to the cross beam; a guide rail is provided on the bottom surface of the baffle, and the other end of the flip bracket is slidably connected to the guide rail.

[0013] Preferably, the driving assembly includes a rotating shaft rotatably connected to the water collecting tank, one end of the rotating shaft passes through the water collecting tank and is connected to a gear, the gear is meshed with a rack, the rack is slidably connected to the outer wall of the water collecting tank, and one end of the rack is connected to an electric push rod; the other end of the rotating shaft is fixedly connected to a swing arm, the other end of the swing arm is rotatably connected to a shaft seat, and the shaft seat is fixedly connected to the bottom of the baffle.

[0014] Preferably, when the baffle is in a vertical state, the top of the baffle is higher than the top surface of the sump to form an extension portion.

[0015] Preferably, the baffle is divided into three parts as a whole, namely a guide part, a filtering and intercepting part and a water blocking part; the guide part is used to guide the rainwater flowing down the slope surface into the filtering and intercepting part; the filtering and intercepting part has a plurality of filter holes for filtering the rainwater; the water blocking part is used to close the sewage outlet.

[0016] Preferably, the flip guide member includes a sleeve and a slide seat, and the sleeve and the slide seat are connected as a whole via a connecting arm; the slide seat has a slide groove adapted to the guide rail; the connecting arm is tilted, and when the baffle is in a horizontal state, the position of the slide seat is higher than the position of the sleeve; when the baffle is in a vertical state, the position of the slide seat is lower than the position of the sleeve.

[0017] On the other hand, the present technical solution also proposes an artificial groundwater recharge method based on roof rainwater collection, using the artificial groundwater recharge system based on roof rainwater collection, including the following steps:

[0018] S1: Installation and construction:

[0019] Install a rainwater recovery unit on an existing or newly built flat roof; construct a rainwater purification unit on the ground; construct a recharge well by drilling holes to form a rainwater recharge unit, and the bottom of the recharge well extends into the underground aquifer; connect the rainwater recovery unit, the rainwater purification unit and the rainwater recharge unit through pipelines;

[0020] S2: Rainwater Harvesting:

[0021] When it is not raining, the baffle is in a horizontal position buckled on the top of the sump, and the sewage outlet is in an open position;

[0022] When it starts to rain, the initial rainwater falls on the slope surface, and after being collected by the slope surface, the initial rainwater carries garbage and impurities and flows to the baffle, and then flows into the water collection tank after being filtered through the filter holes; the garbage and impurities carried in the initial rainwater are intercepted above the filter holes; the filtered initial rainwater washes the bottom of the water collection tank, and the garbage and impurities attached to the water collection tank are washed away by the initial rainwater and discharged through the sewage outlet, realizing the abandonment of the initial rainwater, and at the same time, the abandoned initial rainwater is used to clean the inside of the water collection tank;

[0023] When the initial rainwater is abandoned, the baffle is controlled to flip from a horizontal state to a vertical state, and the baffle closes the sewage outlet; the clean rainwater in the middle and late stages flows into the sump through the slope surface, and then is introduced from the roof to the ground through the rainwater downpipe to complete the collection of rainwater;

[0024] S3: Rainwater purification and recharging:

[0025] The rainwater collected by the rainwater collection unit enters the rainwater purification unit to complete further purification of the rainwater; the purified rainwater is introduced into the rainwater recharge unit and input into the underground aquifer.

[0026] The above technical solution has the following advantages or beneficial effects:

[0027] 1. The present invention achieves the abandonment of initial rainwater by designing a rainwater collection unit, a rainwater purification unit and a rainwater recharge unit, so that the collected rainwater is relatively clean. Through further processing by the rainwater purification unit, the water quality of the recharged rainwater can be improved, and the quality of groundwater recharge can be effectively guaranteed. The present invention constructs a feasible artificial recharge and recharge technology system. By organically integrating and connecting various aspects of artificial recharge, it can maintain or improve the recharge efficiency of artificial recharge projects, reduce the risk of blockage, and extend the time for artificial recharge to maintain high-efficiency recharge, thereby increasing the amount of recharge water. In addition, the system is not only applicable to new buildings, but also to existing buildings, with low modification difficulty and low cost.

[0028] 2. The rainwater collection unit of the present invention adopts a structure of a water collection trough and a baffle. By turning over the baffle, it can switch between horizontal and vertical states. When the baffle is in a horizontal state, it is used to divert and discard the initial rainwater, and intercept the garbage sliding down the slope surface, playing a filtering and blocking role, reducing the dirt and grime inside the water collection trough; when the baffle is in a vertical state, the sewage and drainage outlet is closed, so that the water collection trough forms a water collection trough structure for receiving rainwater. In addition, when the baffle is turned from horizontal to vertical, the garbage and impurities intercepted on the surface of the baffle can be dumped down, realizing the self-cleaning of the baffle.

[0029] 3. The rainwater purification unit in the present invention adopts natural mineral materials to construct a terrace binary structure, simulating the principle of rainwater purification in nature. The purification process is ecological, environmentally friendly, and effective, and can effectively control the water quality of the recharge water source, thereby effectively preventing blockage problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of the groundwater recharge system proposed by the present invention.

[0032] Figure 2 yes Figure 1 Structural cross-section view of the rainwater purification unit.

[0033] Figure 3 yes Figure 1 A partial enlarged view of the rainwater recovery unit.

[0034] Figure 4 yes Figure 3 Schematic diagram of the structure of the central water collection tank.

[0035] Figure 5 This is a schematic diagram of the structure of the baffle during the flipping process. Figure 1 .

[0036] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of the Y region in the middle.

[0037] Figure 7 This is a schematic diagram of the structure of the baffle during the flipping process. Figure 2 .

[0038] Figure 8 yes Figure 7 The structural stereogram of the middle flip bracket after enlargement.

[0039] Fig. 9 yes Figure 5 The structural front view of the middle baffle during the flipping process.

[0040] Fig.10 It is the main structural view of the baffle in the vertical state.

[0041] Fig.11 It is the structural front view when the baffle is in the horizontal state.

[0042] Fig.12It is a three-dimensional diagram of the baffle in the vertical state.

[0043] Fig.13 It is a structural schematic diagram of the rainwater recovery unit during the initial rainwater abandonment.

[0044] Description of reference numerals:

[0045] a-Main building;

[0046] b-rainwater recovery unit; b1-photovoltaic bracket; b2-photovoltaic panel; b3-water collection tank; b31-branch pipe; b32-drainage and sewage outlet; b33-crossbeam; b331-notch; b4-baffle; b41-flow guide; b42-filter interception part; b43-water blocking part; b5-swing arm; b6-axle seat; b7-rotating shaft; b8-guide rail; b9-flip bracket; b91-axle sleeve; b92-connecting arm; b93-slide seat; b931-slideway; b71-gear; b72-rack; b73-electric push rod; b74-fixed seat;

[0047] c-rainwater purification unit; c1-zeolite gravel layer; c2-coarse limestone gravel layer; c3-fine limestone gravel layer; c4-quartz sand layer; c5-water inlet pipe; c6-water outlet pipe;

[0048] d-Rainwater recharge unit;

[0049] e1- regulating tank; e2- rainwater downpipe. DETAILED DESCRIPTION

[0050] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0052] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0053] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0054] like Figure 1-Figure 13 As shown, this embodiment proposes an artificial groundwater recharge system based on roof rainwater collection, including a rainwater recovery unit b, a rainwater purification unit c and a rainwater recharge unit d connected in sequence, wherein the rainwater recovery unit b is used to collect roof rainwater; the rainwater purification unit c is used to purify the collected rainwater; and the rainwater recharge unit d is used to input the purified rainwater into the underground aquifer.

[0055] The following is a further explanation of each of the above parts:

[0056] Part I, Rainwater Recovery Unit B:

[0057] The rainwater recycling unit b in this embodiment is suitable for the building main body a structure with a flat roof, which can be an existing flat roof or a newly built flat roof. The rainwater recycling unit b includes at least one set of sloped surfaces arranged on the flat roof of the building, and a water collecting tank b3 is arranged below the sloped surface. The water collecting tank b3 is connected to the rainwater purification unit c arranged on the ground through the rain down pipe e2; the water collecting tank b3 is a box structure with an opening on the top, and the water collecting tank b3 has five surfaces, namely the bottom surface, the left side surface, the right side surface, the front side surface, and the rear side surface; the right side surface of the water collecting tank b3 is a flippable baffle b4, and the baffle b4 has filter holes for rainwater to enter the water collecting tank b3; the baffle b4 is movably connected to the water collecting tank b3 to form a deformable structure that can switch from vertical to horizontal state; the baffle b4 can be flipped, from horizontal to vertical, and from vertical to horizontal.

[0058] When the baffle b4 is in a horizontal state fastened to the top of the sump b3, a sewage outlet b32 is formed on the right side of the sump b3, which is used to discharge initial rainwater and intercept and clean up garbage; when the baffle b4 is in a vertical state blocking the sewage outlet b32, the sump b3 forms a sump b3 structure, which is used to collect rainwater flowing down from the slope surface.

[0059] The baffle b4 is connected with a driving assembly for realizing the flipping of the baffle b4. By manipulating the driving assembly, the movement control of the baffle b4 can be realized remotely.

[0060] It should be noted that, in this embodiment, the slope surface can be constructed separately, or existing photovoltaic component components can be directly used to reduce costs and integrate the use of resources. In this embodiment, the slope surface is composed of photovoltaic components, which include photovoltaic brackets b1 arranged on the roof, photovoltaic brackets b1 are equipped with photovoltaic panels b2, photovoltaic panels b2 are inclined, and the upper surface of photovoltaic panels b2 forms a slope surface for collecting water. When it is not raining, photovoltaic panels b2 are used to collect light energy, and when it is raining, photovoltaic panels b2 are used to collect rainwater, realizing the multifunctional use of photovoltaic panels b2.

[0061] The water collecting tank b3 is connected to a branch pipe b31, which is connected to the rainwater downpipe e2. The pipe mouth of the branch pipe b31 is higher than the inner bottom of the water collecting tank b3, and a certain distance is left between the two. The purpose of this setting is to prevent initial rainwater from flowing into the branch pipe b31.

[0062] Part 2, about rainwater purification unit c:

[0063] In this embodiment, the rainwater purification unit c includes a regulating pool e1 and a purification pool connected in sequence. The regulating pool e1 is connected to the water collection tank b3 through a rainwater downpipe e2, which plays a role of storage. A purification layer is arranged in the purification pool, and the purification layers are zeolite gravel layer c1, coarse limestone gravel layer c2, fine limestone gravel layer c3, and quartz sand layer c4 from bottom to top. There are water inlet pipes c5 and water outlet pipes c6 on both sides of the purification pool. The water inlet pipe c5 is connected to the regulating pool e1, and the water outlet pipe c6 is connected to the rainwater recharge unit d. The water flows into the purification layer from the water inlet pipe c5, flows upward, and flows out through the top water outlet pipe c6.

[0064] The purification layer simulates the principle of groundwater seepage purification in nature, uses natural mineral fillers, and effectively purifies rainwater through filtration, adsorption, ion exchange, microbial decomposition, etc. The rainwater purification unit c in the present invention uses natural mineral materials to construct a terrace binary structure, simulating the principle of rainwater purification in nature. The purification process is ecological, environmentally friendly, and effective, and can effectively control the water quality of the recharged water source, thereby effectively preventing blockage problems.

[0065] If necessary, an ultraviolet device can be installed on the water outlet pipe c6 for disinfection.

[0066] The specific setting method of baffle b4 is as follows:

[0067] The baffle b4 is movably connected to the water collecting tank b3 through a flip guide, which includes a flip bracket b9. A crossbeam b33 is provided on the top of the water collecting tank b3, and one end of the flip bracket b9 is rotatably connected to the crossbeam b33; a guide rail b8 is provided on the bottom surface of the baffle b4, and the other end of the flip bracket b9 is slidably connected to the guide rail b8. In this embodiment, the middle part of the crossbeam b33 is concave, forming a notch b331, and the notch b331 is used to install the flip bracket b9.

[0068] In this embodiment, the flip guide member includes a sleeve b91 and a slide b93, and the sleeve b91 and the slide b93 are connected as a whole through a connecting arm b92; the slide b93 has a slide groove b931 adapted to the guide rail b8; the connecting arm b92 is tilted, and when the baffle b4 is in a horizontal state, the position of the slide b93 is higher than the position of the sleeve b91; when the baffle b4 is in a vertical state, the position of the slide b93 is lower than the position of the sleeve b91.

[0069] The drive components mentioned above adopt the following structure:

[0070] The driving assembly includes a rotating shaft b7 rotatably connected to the water collecting tank b3, one end of the rotating shaft b7 penetrates the water collecting tank b3 and is connected to a gear b71, the gear b71 is meshed with a rack b72, the rack b72 is slidably connected to the outer wall of the water collecting tank b3, and one end of the rack b72 is connected to an electric push rod b73; the other end of the rotating shaft b7 is fixedly connected to a swing arm b5, the other end of the swing arm b5 is rotatably connected to a shaft seat b6, and the shaft seat b6 is fixedly connected to the bottom of the baffle b4. In this embodiment, the outer wall of the water collecting tank b3 is fixedly connected to a fixed seat b74, the rack b72 is slidably connected to the fixed seat b74, and the electric push rod b73 is installed on the outer wall of the water collecting tank b3. The electric push rod b73 is connected to a controller, and the telescopic control of the electric push rod b73 can be achieved by operating the controller.

[0071] The rainwater collection unit designed in this embodiment adopts the structural form of the water collection tank b3 and the baffle b4. By turning over the baffle b4, it can switch between the horizontal and vertical states. When the baffle b4 is in the horizontal state, it is used to realize the diversion and abandonment of the initial rainwater, and intercept the garbage sliding down the slope surface, play a filtering and blocking role, and reduce the dirt and grime inside the water collection tank b3; when the baffle b4 is in the vertical state, the sewage discharge outlet b32 is closed, so that the water collection tank b3 forms a water collection tank b3 structure for receiving rainwater. In addition, when the baffle b4 is turned from the horizontal to the vertical, the garbage and impurities intercepted on the surface of the baffle b4 can be dumped down, realizing the self-cleaning of the baffle b4.

[0072] In addition, a raindrop sensor can be set to detect whether it is raining. When in use, the raindrop sensor is connected to the controller. When it rains, the raindrop sensor sends a signal to the controller. After receiving the signal, the controller controls the electric push rod b73 to move after T time to achieve the flipping of the baffle b4. T is a parameter set in the controller in advance, which is used to reserve the time for the initial rainwater to be discarded.

[0073] As a feasible embodiment, when the baffle b4 is in a vertical state, the top of the baffle b4 is higher than the top surface of the water collecting tank b3, forming an extension portion. At this time, the extension portion mainly plays a blocking role. The initial rain volume is small, while the mid-term rain volume is large. At this time, rainwater with a fast flow rate and a large flow rate will be formed on the slope surface. If the flow rate is large, the extension portion can play a good water blocking role, preventing relatively clean rainwater from failing to enter the water collecting tank b3 smoothly. With this extension portion, this problem can be well solved.

[0074] The baffle b4 is divided into three parts, namely, the flow guide part b41, the filter interception part b42 and the water blocking part b43; the flow guide part b41 is used to guide the rainwater flowing down the slope surface to the filter interception part b42; the filter interception part b42 has a plurality of filter holes for filtering the rainwater; the water blocking part b43 is used to seal the sewage outlet b32. The flow guide part b41 and the extension part are the same part, the flow guide part b41 mainly uses the upper surface of the baffle b4, and the extension part mainly uses the lower surface of the baffle b4.

[0075] Part III, Rainwater Recharge Unit d:

[0076] The rainwater recharge unit d is a recharge well, which includes a skeleton pipe, and clay is filled around the top 1 / 5 of the skeleton pipe. The top 1 / 5 of the skeleton pipe to the 1 / 10 of the bottom pipe mouth is filled with gravel after wrapping the filter, and the bottom of the filter is a sand settling section. This part can adopt a conventional structure.

[0077] Application results:

[0078] The present invention realizes the abandonment of initial rainwater by designing a rainwater collection unit, a rainwater purification unit c and a rainwater recharge unit d, so that the collected rainwater is relatively clean. Through further treatment by the rainwater purification unit c, the water quality of the recharged rainwater can be improved, and the quality of groundwater recharge can be effectively guaranteed. The present invention constructs a feasible artificial recharge and recharge technology system, which can maintain or improve the recharge efficiency of artificial recharge projects and reduce the risk of blockage by organically integrating and connecting various aspects of artificial recharge, so as to prolong the time for artificial recharge to maintain high-efficiency recharge, thereby increasing the amount of recharged water.

[0079] This embodiment also proposes an artificial groundwater recharge method based on roof rainwater collection, using the artificial groundwater recharge system based on roof rainwater collection, including the following steps:

[0080] S1: Installation and construction:

[0081] A rainwater recovery unit b is installed on an existing or newly built flat roof; a rainwater purification unit c is constructed on the ground; a rainwater recharge unit d is formed by constructing a recharge well by drilling, and the bottom of the recharge well extends into the underground aquifer; the rainwater recovery unit b, the rainwater purification unit c and the rainwater recharge unit d are connected through pipelines.

[0082] S2: Rainwater Harvesting:

[0083] When it is not raining, the baffle b4 is in a horizontal position buckled on the top of the sump b3, and the sewage outlet b32 is in an open position;

[0084] When it starts to rain, the initial rainwater falls on the slope surface. After being collected by the slope surface, the initial rainwater carries garbage and impurities and flows to the baffle b4, and flows into the water collection tank b3 after being filtered through the filter holes. The initial rainwater itself is relatively dirty and the pollution is relatively serious. There are also some garbage and impurities on the surface of the slope surface, such as bird droppings, leaves, gravel, etc. In this way, the slope surface can be washed clean by using the initial rainwater to obtain a cleaner rain collection surface.

[0085] Since the sewage outlet b32 is open, some garbage impurities will inevitably enter the water collection tank b3 and gather at the bottom. The garbage impurities carried by the initial rainwater are intercepted above the filter holes, and the filtered initial rainwater washes the inner bottom of the water collection tank b3. The garbage impurities attached to the water collection tank b3 are washed by the initial rainwater and discharged through the sewage outlet b32, realizing the abandonment of the initial rainwater. At the same time, the abandoned initial rainwater is used to wash the inside of the water collection tank b3 clean, so as to obtain a relatively clean water collection tank b3. In this way, the slope surface and the water collection tank b3 are washed clean, and the rainwater collected later will be relatively clean, with relatively high water quality, reducing the pressure of subsequent treatment.

[0086] After the initial rainwater is abandoned, the baffle b4 is controlled to flip from the horizontal state to the vertical state, and the baffle b4 closes the sewage outlet b32; the clean rainwater in the middle and late stages flows into the sump b3 through the slope surface, and then is introduced from the roof to the ground through the rainwater downpipe e2 to complete the collection of rainwater. In this step, the controller controls the electric push rod b73 to move, and the electric push rod b73 drives the rack b72 to move. When the rack b72 moves, it drives the gear b71 to rotate, thereby realizing the rotation of the swing arm b5, and the swing arm b5 drives the baffle b4 to flip.

[0087] S3: Rainwater purification and recharging:

[0088] The rainwater collected by the rainwater collection unit enters the rainwater purification unit c to complete further purification of the rainwater; the purified rainwater is introduced into the rainwater recharge unit d and input into the underground aquifer.

[0089] Using rainwater for recharge can achieve many beneficial effects: first, it conserves groundwater and protects the ecological environment; second, rainwater can be collected and used on-site to replenish groundwater, which can not only make up for the shortage of conventional water resources, but also reduce the runoff formed by rainfall, reduce the amount of water discharged into the municipal pipe network, and reduce the pressure on the urban drainage system; third, through measures such as rainwater collection, discharge, and purification, pollutants in the water can be intercepted and adsorbed, which can prevent the recharge water from polluting the groundwater to the greatest extent.

[0090] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. An artificial groundwater recharge system based on rooftop rainwater collection, comprising a rainwater recycling unit (b), a rainwater purification unit (c) and a rainwater recharge unit (d) connected in sequence, wherein the rainwater recycling unit (b) is used to collect rooftop rainwater; the rainwater purification unit (c) is used to purify the collected rainwater; and the rainwater recharge unit (d) is used to input the purified rainwater into an underground aquifer; characterized in that: The rainwater recycling unit (b) comprises at least one group of sloped surfaces arranged on the flat roof of the building, a water collecting trough (b3) is arranged below the sloped surface, and the water collecting trough (b3) is connected to the rainwater purification unit (c) arranged on the ground through a rain down pipe (e2); the water collecting trough (b3) is a box structure with an opening on the top, and the right side of the water collecting trough (b3) is a reversible baffle (b4), and the baffle (b4) has filter holes; the baffle (b4) is movably connected to the water collecting trough (b3) to form a vertically movable baffle (b4) capable of being turned over and over. The baffle (b4) is connected to a driving assembly for realizing the flipping of the baffle (b4); when the baffle (b4) is in a horizontal state in which it is buckled on the top of the water collecting tank (b3), a sewage discharge outlet (b32) is formed on the right side of the water collecting tank (b3) for realizing the discharge of initial rainwater and the interception and cleaning of garbage; when the baffle (b4) is in a vertical state in which it is blocked at the sewage discharge outlet (b32), the water collecting tank (b3) forms a water collecting tank (b3) structure for collecting rainwater flowing down from the slope surface; The rainwater purification unit (c) comprises a regulating tank (e1) and a purification tank which are connected in sequence. A purification layer is arranged in the purification tank. The purification layers are, from bottom to top, a zeolite gravel layer (c1), a coarse limestone gravel layer (c2), a fine limestone gravel layer (c3), and a quartz sand layer (c4). The purification tank is provided with an inlet pipe (c5) and an outlet pipe (c6) on both sides. The inlet pipe (c5) is connected to the regulating tank (e1), and the outlet pipe (c6) is connected to the rainwater recharging unit (d).

2. The artificial groundwater recharge system based on roof rainwater collection according to claim 1 is characterized in that: The slope surface is composed of a photovoltaic assembly, and the photovoltaic assembly includes a photovoltaic bracket (b1) arranged on the roof, a photovoltaic panel (b2) is installed on the photovoltaic bracket (b1), and the photovoltaic panel (b2) is arranged at an angle, and the upper surface of the photovoltaic panel (b2) forms a slope surface for collecting water.

3. The artificial groundwater recharge system based on roof rainwater collection according to claim 1 is characterized in that: The baffle plate (b4) is movably connected to the water collecting trough (b3) via a flip guide, the flip guide comprises a flip bracket (b9), a crossbeam (b33) is provided on the top of the water collecting trough (b3), one end of the flip bracket (b9) is rotatably connected to the crossbeam (b33); a guide rail (b8) is provided on the bottom surface of the baffle plate (b4), the other end of the flip bracket (b9) is slidably connected to the guide rail (b8).

4. The artificial groundwater recharge system based on roof rainwater collection according to claim 3 is characterized in that: The driving assembly comprises a rotating shaft (b7) rotatably connected to the water collecting tank (b3); one end of the rotating shaft (b7) passes through the water collecting tank (b3) and is connected to a gear (b71); the gear (b71) is meshed with a rack (b72); the rack (b72) is slidably connected to the outer wall of the water collecting tank (b3); one end of the rack (b72) is connected to an electric push rod (b73); the other end of the rotating shaft (b7) is fixedly connected to a swing arm (b5); the other end of the swing arm (b5) is rotatably connected to a shaft seat (b6); and the shaft seat (b6) is fixedly connected to the bottom of the baffle (b4).

5. The artificial groundwater recharge system based on roof rainwater collection according to claim 4 is characterized in that: When the baffle plate (b4) is in a vertical state, the top of the baffle plate (b4) is higher than the top surface of the water collecting tank (b3), forming an extension portion.

6. The artificial groundwater recharge system based on roof rainwater collection according to claim 5 is characterized in that: The baffle (b4) is divided into three parts as a whole, namely a guide part (b41), a filter interception part (b42) and a water blocking part (b43); the guide part (b41) is used to guide rainwater flowing down the slope surface to the filter interception part (b42); the filter interception part (b42) has a plurality of filter holes for filtering rainwater; the water blocking part (b43) is used to close the sewage outlet (b32).

7. The artificial groundwater recharge system based on roof rainwater collection according to claim 6 is characterized in that: The flip guide member includes a shaft sleeve (b91) and a slide seat (b93), wherein the shaft sleeve (b91) and the slide seat (b93) are connected as a whole via a connecting arm (b92); the slide seat (b93) has a slide groove (b931) adapted to the guide rail (b8); the connecting arm (b92) is tilted, and when the baffle (b4) is in a horizontal state, the position of the slide seat (b93) is higher than the position of the shaft sleeve (b91); when the baffle (b4) is in a vertical state, the position of the slide seat (b93) is lower than the position of the shaft sleeve (b91).

8. An artificial groundwater recharge method based on rooftop rainwater collection, characterized in that: The artificial groundwater recharge system based on roof rainwater collection according to any one of claims 1 to 7 comprises the following steps: S1: Installation and construction: Install a rainwater recovery unit (b) on an existing or newly built flat roof; construct a rainwater purification unit (c) on the ground; construct a recharge well by drilling holes to form a rainwater recharge unit (d), and the bottom of the recharge well extends into an underground aquifer; connect the rainwater recovery unit (b), the rainwater purification unit (c) and the rainwater recharge unit (d) through pipelines; S2: Rainwater Harvesting: When it is not raining, the baffle (b4) is in a horizontal position buckled on the top of the sump (b3), and the sewage outlet (b32) is in an open position; When it starts to rain, initial rainwater falls on the slope surface, is collected by the slope surface, and flows to the baffle (b4) with garbage and impurities, and flows into the water collection tank (b3) after being filtered by the filter holes; the garbage and impurities carried in the initial rainwater are intercepted above the filter holes; the filtered initial rainwater flushes the bottom of the water collection tank (b3), and the garbage and impurities attached to the water collection tank (b3) are flushed by the initial rainwater and discharged through the sewage outlet (b32), thereby realizing the abandonment of the initial rainwater, and at the same time, the abandoned initial rainwater is used to flush the inside of the water collection tank (b3) cleanly; When the initial rainwater is discarded, the baffle (b4) is controlled to flip from a horizontal state to a vertical state, and the baffle (b4) closes the sewage outlet (b32); the clean rainwater in the middle and late stages flows into the sump (b3) through the collection of the slope surface, and then is introduced from the roof to the ground through the rainwater downpipe (e2), completing the collection of rainwater; S3: Rainwater purification and recharging: The rainwater collected by the rainwater collection unit enters the rainwater purification unit (c) to complete further purification of the rainwater; the purified rainwater is introduced into the rainwater recharging unit (d) and input into the underground aquifer.

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