Modular rainwater collection and purification system

Abstract

The application relates to the technical field of rainwater collection and purification, and discloses a modular rainwater collection and purification system, which comprises a treatment box, the front side of the treatment box is provided with a purification assembly extending to the inner side of the treatment box, the inner top wall of the treatment box is provided with a rainwater receiving assembly extending to the top of the treatment box, the inner top wall of the rainwater receiving assembly is provided with a filter grid, the inner wall left side of the treatment box is fixedly installed with a discharge pipe extending to the left side of the treatment box, the outer side of the treatment box is provided with an anti-backflow mechanism penetrating through the inner top wall of the treatment box and extending to the lower side of the rainwater receiving assembly, the inner side of the rainwater receiving assembly is provided with a cleaning mechanism extending to the upper side of the filter grid and abutting against the filter grid, and the outer side of the rainwater receiving assembly is provided with a protruding block. The modular rainwater collection and purification system realizes the purpose of being provided with the anti-backflow mechanism, and realizes the purpose of the filter grid being self-cleaning through the setting of the protruding block and the cleaning mechanism.

Description

Technical Field

[0001] This invention relates to the field of rainwater harvesting and purification technology, specifically a modular rainwater harvesting and purification system. Background Technology

[0002] A modular rainwater harvesting and purification system is a complete set of environmental protection equipment that adopts a modular design, can be flexibly combined, and is adaptable to different scenarios. It is used to collect natural rainwater, purify it through multiple stages, and realize the resource utilization of rainwater. Existing technical solutions have the following defects: the risk of backflow is prominent, as there is no corresponding anti-backflow structure. External sewage, groundwater, and pipeline return water can easily backflow into the system through rainwater inlets and pipe interfaces, contaminating the purification modules, damaging the equipment, and even causing the entire system to malfunction. Furthermore, the filter screen is prone to clogging because it lacks a self-cleaning structure. Fallen leaves, debris, and fine particles carried by rainwater can easily adhere to the surface of the screen, requiring frequent manual cleaning. This not only increases maintenance costs but also prevents rainwater from being collected normally due to screen clogging, affecting water resource utilization. Therefore, a modular rainwater harvesting and purification system is proposed to solve the above-mentioned problems. Summary of the Invention

[0003] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a modular rainwater harvesting and purification system with the advantages of an anti-backflow structure and a self-cleaning filter grille, thus solving the problems mentioned in the background section.

[0004] (II) Technical Solution To achieve the aforementioned purpose of having an anti-backflow structure and a self-cleaning filter grille, the present invention provides the following technical solution: a modular rainwater collection and purification system, including a treatment box, a purification component extending to its inner side on the front side of the treatment box, a rain-collecting component extending to its top on the inner top wall of the treatment box, a filter mesh on the inner top wall of the rain-collecting component, a discharge pipe extending to its left side fixedly installed on the left side of the inner wall of the treatment box, an anti-backflow mechanism penetrating the inner top wall of the treatment box and extending to the bottom of the rain-collecting component on the outer side of the treatment box, a cleaning mechanism extending to and fitting the filter mesh on the inner side of the rain-collecting component, and a protrusion on the outer side of the rain-collecting component; The purification assembly includes a purification plate, and the purification plate is movably installed on the front side of the treatment box and fits against the treatment box. A handle is fixedly installed on the front side of the purification plate.

[0005] Preferably, the rain-collecting assembly includes a rain-collecting hopper, the inner top wall of the treatment box is fixedly installed with a rain-collecting hopper extending to its top, the filter mesh is movably installed on the inner top wall of the rain-collecting hopper, the inner bottom wall of the rain-collecting hopper is fixedly installed with a sealing inner ring, the protrusion is fixedly installed on the periphery of the rain-collecting hopper, and the inner top wall of the treatment box is fixedly installed with two positioning plates located on the left and right sides of the rain-collecting hopper respectively.

[0006] Preferably, the anti-backflow mechanism includes a limiting frame. The limiting frame extending to the inner side of the inner top wall of the treatment box is fixedly installed. The limiting frame is located on the right side of the right positioning plate. A U-shaped plate that penetrates the limiting frame and extends to the right side of the treatment box is movably installed on the inner side of the treatment box. A guide frame is fixedly installed on the right side of the inner wall of the treatment box. A horizontal plate that is fixedly connected to one end of the U-shaped plate is slidably installed on the inner side of the guide frame. An outer cylinder is fixedly installed on the top of the horizontal plate. An inner plug block located directly below the sealing inner ring is fixedly installed on the inner side of the outer cylinder. A movable frame that is slidably connected to the outer side of the treatment box is fixedly installed on one end of the U-shaped plate. Three floats are movably installed on the bottom of the movable frame.

[0007] Preferably, the cleaning mechanism includes a support plate. A support plate located below the filter mesh is fixedly installed between the front and rear sides of the inner wall of the rain collecting hopper. The top of the support plate has an installation groove. A motor is fixedly installed inside the installation groove. A rotating shaft extending to the top of the filter mesh is fixedly installed at the output shaft of the motor. A brush plate located above the filter mesh is fixedly installed outside the rotating shaft. A cleaning brush that fits against the top of the filter mesh is fixedly installed at the bottom of the brush plate. A box is fixedly installed at the top right end of the brush plate. A movable frame extending to the right side of the box is slidably installed on the left side of the box. A telescopic spring fixedly connected to the right side of the inner wall of the box is fixedly installed on the left side of the inner wall of the movable frame. A vertical plate is fixedly installed at the right end of the movable frame. A striking block that fits against the outside of the rain collecting hopper is fixedly installed on one side of the vertical plate.

[0008] Preferably, a control valve is provided on the outside of the discharge pipe, and the control valve is used to control the discharge flow rate of the collected rainwater.

[0009] Preferably, the striking block is made of rubber, the cleaning brush is made of nylon, and the inner wall of the box has through holes that are adapted to the movable frame.

[0010] Preferably, the float is made of foam material, and the three floats are equidistantly distributed at the bottom of the moving frame.

[0011] Preferably, the outer diameter of the inner plug is adapted to the inner diameter of the sealing inner ring, a rubber sealing gasket is provided on the top of the inner plug, and the protrusions are distributed in a ring at equal intervals around the periphery of the rain hopper.

[0012] Preferably, the purification plate is filled with multiple layers of filter material, including an activated carbon layer, a quartz sand layer, and a PP cotton layer.

[0013] (III) Beneficial Effects Compared with the prior art, the present invention provides a modular rainwater harvesting and purification system, which has the following beneficial effects: 1. This modular rainwater harvesting and purification system incorporates an anti-backflow mechanism. Limiting frames and guide frames constrain the movement of the U-shaped plate and horizontal plate, preventing deviation that could lead to sealing failure. Rubber sealing gaskets fill the tiny gaps between the inner plug and the inner sealing ring, ensuring zero leakage. Foam floats, made of low-density material, are triggered by even minor water level changes, providing a fast response. Evenly distributed floats balance the force, preventing unilateral tilting that could cause jamming. When the external water level rises to the height of the floats, the floats rise due to buoyancy, causing the moving frame to rise. When the water level reaches its highest point, the inner plug extends to the inner side of the inner sealing ring, forming a closed structure to prevent backflow of external rainwater, thus achieving the purpose of the anti-backflow structure.

[0014] 2. This modular rainwater collection and purification system, through the setting of protrusions and a cleaning mechanism, starts with a motor, which drives the brush plate to rotate via a rotating shaft. The nylon bristles of the cleaning brush adhere to the pores of the filter mesh, scraping away attached debris. As the brush plate rotates, the telescopic spring inside the box pushes the moving frame to reciprocate. The moving frame, through the upright plate, drives the striking block to strike the outer wall of the rainwater collection hopper. The vibration is transmitted to the filter mesh, causing the small particles stuck in the pores to fall off. The nylon cleaning brush is wear-resistant and flexible, which can scrape away debris without damaging the filter mesh. The rubber striking block absorbs shock and prevents damage, avoiding breakage of the rainwater collection hopper due to long-term striking. The telescopic spring provides elasticity, making the striking action buffered, extending the life of the components, and achieving the purpose of self-cleaning of the filter grille. Attached Figure Description

[0015] Figure 1 This is a three-dimensional view of the structure of the present invention; Figure 2 This is a left-side perspective view of the structure of the present invention; Figure 3 This is a bottom-view sectional perspective view of the structure of the present invention; Figure 4 This is a partial sectional perspective view of the anti-backflow mechanism of the present invention; Figure 5 This is a perspective view of the anti-backflow mechanism of the present invention, viewed from the left and from below. Figure 6 This is a partial sectional perspective view of the rain-collecting component of the present invention; Figure 7 This is a partial exploded perspective view of the cleaning mechanism of the present invention; Figure 8 This is a partial cross-sectional perspective view of the cleaning mechanism of the present invention.

[0016] In the diagram: 1. Processing box; 2. Purification component; 21. Purification plate; 22. Handle; 3. Rain collection component; 31. Rain collection hopper; 32. Sealing inner ring; 33. Positioning plate; 4. Filter mesh; 5. Anti-backflow mechanism; 51. Limiting frame; 52. U-shaped plate; 53. Guide frame; 54. Horizontal plate; 55. Outer cylinder; 56. Inner block; 57. Moving frame; 58. Floating block; 6. Cleaning mechanism; 601. Support plate; 602. Mounting slot; 603. Motor; 604. Rotating shaft; 605. Brush plate; 606. Cleaning brush; 607. Box body; 608. Moving frame body; 609. Telescopic spring; 610. Vertical plate; 611. Striking block; 7. Protrusion; 8. Discharge pipe. Detailed Implementation

[0017] 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, and 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.

[0018] Please see Figure 1-8 The present invention provides a technical solution: a modular rainwater collection and purification system, including a treatment box 1, a purification component 2 extending to the inside of the front side of the treatment box 1, a rain-receiving component 3 extending to the top of the inner top wall of the treatment box 1, a filter mesh 4 on the inner top wall of the rain-receiving component 3, a discharge pipe 8 extending to the left side of the inner wall of the treatment box 1, an anti-backflow mechanism 5 penetrating the inner top wall of the treatment box 1 and extending to the bottom of the rain-receiving component 3 on the outer side of the treatment box 1, a cleaning mechanism 6 extending to the top of the filter mesh 4 and fitting with it on the inner side of the rain-receiving component 3, and a protrusion 7 on the outer side of the rain-receiving component 3.

[0019] A control valve is installed on the outside of the discharge pipe 8. The control valve is used to control the discharge flow rate of the collected rainwater.

[0020] The treatment box 1 serves as the core container for rainwater collection, purification, and storage. It provides a sealed environment to prevent external pollution and is connected to the rainwater receiving component 3 to form a rainwater inflow channel. The purified rainwater is discharged through the discharge pipe 8 on the left side, and the flow rate is regulated by the control valve.

[0021] The purification component 2 includes a purification plate 21. The purification plate 21 is movably installed on the front side of the treatment box 1 and fits against the treatment box 1. A handle 22 is fixedly installed on the front side of the purification plate 21.

[0022] The interior of the purification plate 21 is filled with multiple layers of filter material, including an activated carbon layer, a quartz sand layer, and a PP cotton layer.

[0023] The purification plate 21 uses multiple layers of filter materials to intercept impurities, odors, and harmful substances in rainwater. The PP cotton layer is for primary filtration, intercepting large particles such as mud, sand, and leaves (pore size approximately 5-10μm). The quartz sand layer is for secondary filtration, adsorbing suspended solids and some heavy metals (pore size approximately 0.5-1mm). The activated carbon layer is for deep purification, removing residual chlorine, organic matter, and odors (pore size approximately 0.01-0.1mm). The filter plate 21 can be quickly pulled out via the handle 22, facilitating filter material replacement and reducing maintenance costs. The handle 22 also provides a leverage point, making it convenient for users to install or remove the purification plate 21, especially suitable for non-professionals.

[0024] The rain-collecting assembly 3 includes a rain-collecting hopper 31. The rain-collecting hopper 31 extending to the top of the inner top wall of the treatment box 1 is fixedly installed. The filter mesh 4 is movably installed on the inner top wall of the rain-collecting hopper 31. A sealing inner ring 32 is fixedly installed on the inner bottom wall of the rain-collecting hopper 31. A protrusion 7 is fixedly installed on the periphery of the rain-collecting hopper 31. Two positioning plates 33 are fixedly installed on the inner top wall of the treatment box 1, located on the left and right sides of the rain-collecting hopper 31 respectively.

[0025] The rain hopper 31 expands the rainwater collection area and guides rainwater into the treatment tank 1. The top opening maximizes the amount of rainfall received, and the sloping inner wall accelerates the convergence of rainwater to the inner bottom wall, reducing stagnation. The movable filter mesh 4 intercepts large particles of debris to prevent clogging of subsequent purification components. The filter mesh 4 physically intercepts debris such as leaves and branches, protecting the purification plate 21 from rapid clogging. It is made of stainless steel or high-strength plastic, which is corrosion-resistant and easy to clean. The sealing inner ring 32 cooperates with the inner plug 56 of the anti-backflow mechanism 5 to form a sealing structure, blocking the backflow of external sewage. After the inner plug 56 rises, its top rubber pad fits tightly against the inner wall of the sealing inner ring 32, forming a one-way valve effect. The ring-shaped distribution of protrusions 7 enhances the connection strength between the rain hopper 31 and the inner top wall of the treatment tank 1. It cooperates with the positioning plate 33 to prevent the installation of the rain hopper 31 from being offset. The positioning plate 33 restricts the horizontal movement of the rain hopper 31 to ensure its accurate relative position with the anti-backflow mechanism 5.

[0026] The anti-backflow mechanism 5 includes a limiting frame 51. The limiting frame 51 extending to the inner side is fixedly installed on the inner top wall of the treatment box 1. The limiting frame 51 is located on the right side of the right positioning plate 33. A U-shaped plate 52 that passes through the limiting frame 51 and extends to the right side of the treatment box 1 is movably installed on the inner side of the treatment box 1. A guide frame 53 is fixedly installed on the right side of the inner wall of the treatment box 1. A horizontal plate 54 that is fixedly connected to one end of the U-shaped plate 52 is slidably installed on the inner side of the guide frame 53. An outer cylinder 55 is fixedly installed on the top of the horizontal plate 54. An inner block 56 located directly below the sealing inner ring 32 is fixedly installed on the inner side of the outer cylinder 55. A movable frame 57 that is slidably connected to the outer side of the treatment box 1 is fixedly installed on one end of the U-shaped plate 52. Three floats 58 are movably installed on the bottom of the movable frame 57.

[0027] The float 58 is made of foam. The three floats 58 are evenly distributed at the bottom of the moving frame 57. The outer diameter of the inner block 56 is matched with the inner diameter of the sealing inner ring 32. A rubber sealing gasket is provided on the top of the inner block 56. The protrusions 7 are evenly distributed in a ring around the periphery of the rain hopper 31.

[0028] The limiting frame 51 constrains the movement trajectory of the U-shaped plate 52 to prevent it from deviating and causing the backflow prevention function to fail. The U-shaped plate 52 transmits the buoyancy of the float 58 to the horizontal plate 54, driving the inner block 56 to rise and fall. It passes through the limiting frame 51 to ensure smooth up and down movement. The guide frame 53 is fixed to the inner wall of the treatment box 1 to provide a vertical sliding track for the horizontal plate 54. The horizontal plate 54 connects the U-shaped plate 52 and the outer cylinder 55, converting horizontal movement into vertical movement. The outer cylinder 55 protects the inner block 56 to prevent it from being deviated by rainwater impact. The inner block 56 is the core sealing element. After rising, it blocks the sealing inner ring 32 and blocks the backflow path. The top rubber pad fills the tiny gaps to ensure zero leakage. The moving frame 57 connects the U-shaped plate 52 and the float 58 to transmit buoyancy. The float 58 has a low density, and a slight rise in water level can generate sufficient buoyancy. It is evenly distributed to balance the force and avoid unilateral tilting that causes jamming. The trigger condition is that when the external water depth is greater than or equal to the height of the float 58, the backflow prevention mechanism is activated.

[0029] The cleaning mechanism 6 includes a tray 601. The tray 601, located below the filter mesh 4, is fixedly installed between the front and rear sides of the inner wall of the rain-collecting hopper 31. A mounting groove 602 is formed at the top of the tray 601. A motor 603 is fixedly installed inside the mounting groove 602. A rotating shaft 604 extending to the top of the filter mesh 4 is fixedly installed at the output shaft of the motor 603. A brush plate 605 located above the filter mesh 4 is fixedly installed on the outer side of the rotating shaft 604. A component is fixedly installed at the bottom of the brush plate 605... A cleaning brush 606 is attached to the top of the filter mesh 4. A box 607 is fixedly installed on the top right side of the brush plate 605. A movable frame 608 extending to the right side of the box 607 is slidably installed on the left side of the box 607. A telescopic spring 609 fixedly connected to the right side of the inner wall of the box 607 is fixedly installed on the left side of the inner wall of the movable frame 608. A vertical plate 610 is fixedly installed on the right side of the movable frame 608. A tapping block 611 that fits against the outside of the rain hopper 31 is fixedly installed on one side of the vertical plate 610.

[0030] The striking block 611 is made of rubber, the cleaning brush 606 is made of nylon, and the inner wall of the box 607 has through holes that are compatible with the movable frame 608.

[0031] The support plate 601 and mounting slot 602 fix the motor 603 to ensure stable operation and prevent vibration from causing it to fall off. The motor 603 and the rotating shaft 604 drive the brush plate 605 to rotate, realizing the automatic cleaning of the filter mesh 4. The motor 603 is located below the rain hopper 31 to prevent rainwater from directly wetting it. The brush plate 605 supports the cleaning brush 606 and transmits rotational power. The cleaning brush 606 has the following characteristics: wear resistance: it is not easily deformed by long-term scraping of the filter mesh 4; flexibility: it fits the mesh surface and removes fine particles. The box 607 accommodates the telescopic spring. Spring 609 limits the sliding range of the movable frame 608. The movable frame 608 reciprocates through the telescopic spring 609, driving the striking block 611 to vibrate. The telescopic spring 609 provides elastic force, causing the movable frame 608 to periodically extend and retract when the brush plate 605 rotates, producing a vibration effect. The upright plate 610 transmits the displacement of the movable frame 608 to the striking block 611. The striking block 611 (made of rubber) prevents excessive striking force from damaging the rain collection hopper 31. The vibration causes dirt in the pores of the filter mesh 4 to fall off.

[0032] When in use, place the treatment box 1 on a flat, open surface, ensuring the top of the rain hopper 31 is unobstructed. Check the anti-backflow mechanism 5, confirming that the float 58 is undamaged and the moving frame 57 slides smoothly. Manually lift the moving frame 57 and test the seal between the inner block 56 and the inner sealing ring 32. Push the purification plate 21, filled with PP cotton, quartz sand, and activated carbon, into the front slot of the treatment box 1, ensuring a tight fit with the box body. Select the pipe diameter according to the usage scenario, install the control valve, and adjust it to the closed position. During natural rainfall, rainwater passes through the rain hopper 31, filter mesh 4, treatment box, and purification plate 21, completing purification and storage. After rain, check if the moving frame 57 has reset. If it has not reset, clean the debris around the float 58. Connect the motor 603 to the power supply and run for 5- Observe the impact frequency of the striking block 611 for 10 minutes. If abnormal, check whether the telescopic spring 609 is stuck. Close the control valve and rinse the inner wall of the rain collection hopper 31 with a high-pressure water gun. Every three to six months, pull out the handle 22, remove the purification plate 21, and replace the PP cotton layer, quartz sand layer, and activated carbon layer in sequence. After reinstallation, test the sealing performance. Check the corrosion of the U-shaped plate 52 and guide frame 53 every year, apply waterproof lubricant, and replace the aged float 58 (standard: buoyancy drops to below 70% of the initial value). In case of emergency, close the control valve in advance, drain the rainwater in the treatment box 1, and reduce the load on the anti-backflow mechanism. When the filter screen is clogged, in an emergency, the filter screen 4 can be rotated counterclockwise (if designed to be detachable), removed, cleaned, and then reset.

[0033] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0034] In summary, this modular rainwater harvesting and purification system, through the setting of an anti-backflow mechanism 5, and the constraint of the movement trajectory of the U-shaped plate 52 and the horizontal plate 54 by the limiting frame 51 and the guide frame 53, prevents deviation that could lead to sealing failure. The rubber sealing gasket fills the tiny gap between the inner plug 56 and the inner sealing ring 32, ensuring zero leakage. The foam float 58, made of low-density material, can be triggered by even a slight change in water level, resulting in a fast response. The equidistantly distributed floats balance the force and prevent jamming caused by unilateral tilting. When the external water level rises to the height of the float 58... The float 58 rises due to buoyancy, causing the moving frame 57 to rise. When the water level reaches its highest value, the inner block 56 extends to the inner side of the sealing inner ring 32, thus forming a closed structure to prevent backflow of rainwater and achieve the purpose of having an anti-backflow structure. By setting the protrusion 7 and the cleaning mechanism 6, the motor 603 starts and drives the brush plate 605 to rotate through the rotating shaft 604. The nylon bristles of the cleaning brush 606 adhere to the pores of the filter mesh 4 and scrape off the attached debris. When the brush plate 605 rotates, the telescopic spring 609 inside the box 607... The moving frame 608 reciprocates, and the moving frame 608 drives the striking block 611 to impact the outer wall of the rain collection hopper 31 via the upright plate 610. The vibration is transmitted to the filter mesh 4, causing the small particles stuck in the pores to fall off. The nylon cleaning brush 606 is wear-resistant and flexible, which can scrape away debris without damaging the filter mesh 4. The rubber striking block 611 absorbs shock and prevents damage, avoiding breakage of the rain collection hopper 31 due to long-term impact. The telescopic spring 609 provides elastic force, making the impact action buffered, extending the component life, and realizing the self-cleaning of the filter grille. The purpose is to address the prominent risk of backflow, the lack of corresponding anti-backflow structures, and the fact that external sewage, groundwater, and pipe return water can easily flow back into the system through rainwater inlets and pipe interfaces, contaminating the purification modules, damaging equipment, and even paralyzing the entire system. Furthermore, the filter screens are prone to clogging due to the absence of self-cleaning structures, allowing rainwater-carried leaves, debris, and fine particles to adhere to the screen surface, requiring frequent manual cleaning. This not only increases maintenance costs but also prevents proper rainwater collection due to screen blockage, affecting water resource utilization.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular rainwater harvesting and purification system, comprising a treatment tank (1), wherein a purification component (2) extending to the inside of the front side of the treatment tank (1), a rain-collecting component (3) extending to the top of the inner top wall of the treatment tank (1), a filter mesh (4) being provided on the inner top wall of the rain-collecting component (3), and a discharge pipe (8) extending to the left side of the inner wall of the treatment tank (1) being fixedly installed, characterized in that: The outer side of the treatment box (1) is provided with an anti-backflow mechanism (5) that penetrates the inner top wall of the treatment box (1) and extends to the bottom of the rain receiving component (3). The inner side of the rain receiving component (3) is provided with a cleaning mechanism (6) that extends to the top of the filter mesh (4) and fits therewith. The outer side of the rain receiving component (3) is provided with a protrusion (7). The purification component (2) includes a purification plate (21). The purification plate (21) is movably installed on the front side of the treatment box (1) and fits against the treatment box (1). A handle (22) is fixedly installed on the front side of the purification plate (21).

2. The modular rainwater harvesting and purification system according to claim 1, characterized in that: The rain-collecting assembly (3) includes a rain-collecting hopper (31). The rain-collecting hopper (31) extending to the top of the inner top wall of the treatment box (1) is fixedly installed. The filter mesh (4) is movably installed on the inner top wall of the rain-collecting hopper (31). A sealing inner ring (32) is fixedly installed on the inner bottom wall of the rain-collecting hopper (31). The protrusion (7) is fixedly installed on the periphery of the rain-collecting hopper (31). Two positioning plates (33) are fixedly installed on the inner top wall of the treatment box (1) and located on the left and right sides of the rain-collecting hopper (31).

3. The modular rainwater harvesting and purification system according to claim 2, characterized in that: The anti-backflow mechanism (5) includes a limiting frame (51). The limiting frame (51) extending to the inner side is fixedly installed on the inner top wall of the treatment box (1). The limiting frame (51) is located on the right side of the right positioning plate (33). A U-shaped plate (52) penetrating the limiting frame (51) and extending to the right side of the treatment box (1) is movably installed on the inner side of the treatment box (1). A guide frame (53) is fixedly installed on the right side of the inner wall of the treatment box (1). A horizontal plate (54) is slidably installed on the inner side and fixedly connected to one end of the U-shaped plate (52). An outer cylinder (55) is fixedly installed on the top of the horizontal plate (54). An inner block (56) located directly below the sealing inner ring (32) is fixedly installed on the inner side of the outer cylinder (55). A movable frame (57) is fixedly installed on one end of the U-shaped plate (52) and slidably connected to the outside of the processing box (1). Three floating blocks (58) are movably installed at the bottom of the movable frame (57).

4. The modular rainwater harvesting and purification system according to claim 2, characterized in that: The cleaning mechanism (6) includes a tray (601). The tray (601) located below the filter mesh (4) is fixedly installed between the front and rear sides of the inner wall of the rain hopper (31). The top of the tray (601) is provided with a mounting groove (602). A motor (603) is fixedly installed inside the mounting groove (602). A rotating shaft (604) extending to the top of the filter mesh (4) is fixedly installed at the output shaft of the motor (603). A brush plate (605) located above the filter mesh (4) is fixedly installed on the outer side of the rotating shaft (604). The bottom of the brush plate (605) is fixedly installed. A cleaning brush (606) is installed that fits against the top of the filter mesh (4). A box (607) is fixedly installed on the top right side of the brush plate (605). A movable frame (608) extending to the right side of the box (607) is slidably installed on the left side of the box (607). A telescopic spring (609) fixedly connected to the right side of the inner wall of the movable frame (608) is fixedly installed on the left side of the inner wall. A vertical plate (610) is fixedly installed on the right side of the movable frame (608). A knocking block (611) that fits against the outside of the rain hopper (31) is fixedly installed on one side of the vertical plate (610).

5. A modular rainwater harvesting and purification system according to claim 1, characterized in that: A control valve is provided on the outside of the discharge pipe (8), which is used to control the discharge flow rate of collected rainwater.

6. A modular rainwater harvesting and purification system according to claim 4, characterized in that: The striking block (611) is made of rubber, the cleaning brush (606) is made of nylon, and the inner wall of the box (607) has a through hole that is compatible with the movable frame (608).

7. A modular rainwater harvesting and purification system according to claim 3, characterized in that: The float (58) is made of foam material, and the three floats (58) are equidistantly distributed at the bottom of the moving frame (57).

8. A modular rainwater harvesting and purification system according to claim 3, characterized in that: The outer diameter of the inner plug (56) is adapted to the inner diameter of the sealing inner ring (32). A rubber sealing gasket is provided on the top of the inner plug (56). The protrusions (7) are distributed in a ring at equal intervals around the rain hopper (31).

9. A modular rainwater harvesting and purification system according to claim 1, characterized in that: The interior of the purification plate (21) is filled with multiple layers of filter material, including an activated carbon layer, a quartz sand layer and a PP cotton layer.

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