Roof rainwater collection and utilization system for building

Abstract

The invention discloses a roof rainwater collection and utilization system for a building, and relates to the technical field of buildings, the roof rainwater collection and utilization system comprises a wall body and a building roof, and the system is mainly composed of a collection mechanism, a water guide mechanism, an overflow mechanism, a filtering mechanism and a water storage mechanism; the collecting mechanism comprises a supporting plate, a water storage fence and a protective net and is used for intercepting and collecting roof rainwater. The water guide mechanism guides rainwater downwards through a water leakage hole, a connecting water pipe, a bearing water pipe and a water guide pipe; the overflow mechanism is arranged between the connecting water pipe and the bearing water pipe, and automatic drainage and blocking prevention are achieved through an overflow pipe and a drainage pipe when the water amount is too large. The filtering mechanism comprises a filtering box internally provided with a first filtering plate and a second filtering plate, and multi-stage filtering is achieved to improve water quality; the water storage mechanism conveys the filtered rainwater to a water storage tank for storage through a collecting water pipe; the system is reasonable in structure, flexible to install and suitable for areas lack of water resources, can efficiently collect, purify and store rainwater, and has the advantages of overflow prevention, easiness in maintenance and sustainable utilization.

Description

Technical Field

[0001] This invention relates to the field of building technology, and more specifically to a roof rainwater harvesting and utilization system for buildings. Background Technology

[0002] In vast rural areas, due to natural geography and historical settlement patterns, the population distribution is generally highly dispersed. Especially for remote, complex, and arid mountainous areas and villages, water resources are not only a basic necessity for life, but also an extremely precious and often scarce strategic necessity. In these areas, surface water sources are scarce, groundwater extraction is difficult or extremely deep, and conventional centralized water supply systems are difficult to cover. Therefore, the local residents' domestic and production water use largely depends on natural rainfall. In order to cope with long-term drought and seasonal water shortage, they store as much rainwater as possible during the limited rainy season each year for use in the dry season.

[0003] Currently, the most common and traditional method of rainwater harvesting in practice is to use ordinary containers that are already in use at home or that have been specially purchased, such as jars, buckets, basins, and urns, to collect rainwater directly under the eaves, in the yard, or on the side of a slope. Although this method is simple, easy to implement, and inexpensive, it has many and significant limitations that seriously restrict the efficient use of rainwater resources. Therefore, the simple container rainwater collection method widely used in rural areas is limited by its inherent storage capacity, time-dependent nature, water quality control problems, and low system efficiency, making it difficult to achieve efficient use of limited rainfall resources. Summary of the Invention

[0004] The purpose of this invention is to provide a roof rainwater harvesting and utilization system for buildings, in order to solve the problem that it is difficult to efficiently collect and reuse rainwater in rural areas in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a roof rainwater collection and utilization system for buildings, comprising a wall on which a building roof is fixedly mounted, and further comprising: a collection mechanism fixedly mounted on the wall for rainwater collection, the collection mechanism comprising a support plate fixedly mounted on the wall, a water-storing enclosure fixedly mounted on the support plate, and a protective net fixedly mounted between the water-storing enclosure and the building roof; and a water guiding mechanism fixedly mounted at the bottom of the support plate for guiding the rainwater collected by the collection mechanism, the water guiding mechanism comprising a plurality of drainage holes formed on the support plate, and a plurality of connecting water pipes fixedly mounted at the bottom of the support plate below the drainage holes. A receiving pipe is fixedly installed at the bottom of the connecting water pipe, and a guide pipe is fixedly installed at the bottom of the receiving water pipe; an overflow mechanism is fixedly installed between the connecting water pipe and the receiving water pipe, the overflow mechanism includes a sealing pipe fixedly installed between the connecting water pipe and the receiving water pipe, and an overflow pipe is fixedly installed on the sealing pipe; a filtration mechanism is fixedly installed between the receiving water pipe and the guide pipe, the filtration mechanism includes a filter box fixedly installed between the receiving water pipe and the guide pipe, and a first filter plate and a second filter plate are slidably installed inside the filter box; a water storage mechanism is installed below the guide pipe, the water storage mechanism includes a collecting water pipe fixedly installed on the guide pipe, and a water tank is fixedly installed at the end of the collecting water pipe.

[0006] Furthermore, the collection mechanism also includes a reinforcing base plate fixedly installed at the bottom of the water storage enclosure, the water storage enclosure being fixedly installed on the support plate via the reinforcing base plate; and a waterproof material is fixedly installed between the reinforcing base plate and the support plate.

[0007] Furthermore, the collection mechanism also includes several support frames fixedly installed between the bottom of the reinforced base plate and the side wall of the wall.

[0008] Furthermore, the water guiding mechanism also includes several fixed brackets fixedly installed on the connecting water pipe, the receiving water pipe and the guiding water pipe, and the fixed brackets are fixedly installed on the wall.

[0009] Furthermore, the overflow mechanism also includes a drain pipe fixedly installed on the overflow pipe, and the overflow pipe and the drain pipe are internally connected.

[0010] Furthermore, the overflow mechanism also includes a connecting water pipe with its bottom inserted into the receiving water pipe, and the receiving water pipe has an open structure at its top.

[0011] Furthermore, the filtration mechanism also includes several mounting slots inside the filter box, and the first filter plate and the second filter plate are slidably disposed inside the filter box through the mounting slots; each of the first filter plate and the second filter plate has a limiting groove, the first filter plate is fixedly disposed with a first filter screen through the limiting groove, and the second filter plate is fixedly disposed with a second filter screen through the limiting groove.

[0012] Furthermore, the filtration mechanism also includes connection ports at the top and bottom of the filter box. The filter box is fixedly connected to the receiving water pipe through the connection port at the top, and the filter box is fixedly connected to the water guide pipe through the connection port at the bottom. A sealing door is rotatably provided on the side wall of the filter box.

[0013] Furthermore, the water storage mechanism also includes a sealing cap screwed onto the top of the water tank.

[0014] Compared with existing technologies, the present invention provides a roof rainwater collection and utilization system for buildings. The system comprises a building roof, a water storage enclosure, and a protective net to form a collection mechanism, which initially intercepts and collects rainwater. Rainwater enters the connecting water pipe through drainage holes on the support plate, flows sequentially through a receiving water pipe, a filter box, and a guide pipe, and finally enters a storage tank through a collection pipe. The filter box contains a sliding, removable first filter plate and a second filter plate, each equipped with a first and second filter screen, respectively, achieving multi-stage filtration to improve water quality. An overflow mechanism automatically drains excess water through a sealed pipe, an overflow pipe, and a drain pipe to prevent clogging. The storage tank is equipped with a sealed cover to maintain water cleanliness. This system has a reasonable structure, flexible installation, and can effectively collect, filter, and store rainwater. It is particularly suitable for water-scarce rural or remote areas, possessing advantages such as anti-clogging, easy maintenance, and expandability, thus contributing to the sustainable utilization of rainwater. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the building roof rainwater harvesting and utilization system provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the water storage enclosure connection structure provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the reinforced base plate connection structure provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the water collection pipe connection structure provided in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the internal structure of the sealing tube provided in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the internal structure of the filter box provided in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Building roof; 2. Water storage enclosure; 3. Connecting water pipe; 4. Receiving water pipe; 5. Filter box; 6. Water guide pipe; 7. Water collection pipe; 8. Drainage pipe; 9. Water storage tank; 10. Sealing cover; 11. Wall; 12. Support plate; 13. Reinforced base plate; 14. Protective net; 15. Support frame; 16. Leakage hole; 17. Fixing frame; 18. Sealing pipe; 19. Overflow pipe; 20. Sealing door; 21. Connection port; 22. Installation groove; 23. First filter plate; 24. Second filter plate; 25. Limiting groove; 26. No. 1 filter screen; 27. No. 2 filter screen. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] As attached Figure 1 To be continued Figure 6 As shown:

[0026] Example 1:

[0027] This invention provides a roof rainwater harvesting and utilization system for buildings, including a wall 11, on which a building roof 1 is fixedly installed. It also includes: a collection mechanism fixedly installed on the wall 11 for rainwater collection; the collection mechanism includes a support plate 12 fixedly installed on the wall 11, a water-storing enclosure 2 fixedly installed on the support plate 12, and a protective net 14 fixedly installed between the water-storing enclosure 2 and the building roof 1; and a water guiding mechanism fixedly installed at the bottom of the support plate 12 for guiding the rainwater collected by the collection mechanism. The water guiding mechanism includes a plurality of drainage holes 16 opened on the support plate 12, and a plurality of connecting water pipes 3 fixedly installed at the bottom of the support plate 12 below the drainage holes 16. A receiving water pipe 4 is fixedly installed, and a guide water pipe 6 is fixedly installed at the bottom of the receiving water pipe 4; an overflow mechanism is fixedly installed between the connecting water pipe 3 and the receiving water pipe 4, and the overflow mechanism includes a sealing pipe 18 fixedly installed between the connecting water pipe 3 and the receiving water pipe 4, and an overflow pipe 19 is fixedly installed on the sealing pipe 18; a filtration mechanism is fixedly installed between the receiving water pipe 4 and the guide water pipe 6, and the filtration mechanism includes a filter box 5 fixedly installed between the receiving water pipe 4 and the guide water pipe 6, and a first filter plate 23 and a second filter plate 24 are slidably installed inside the filter box 5; a water storage mechanism is installed below the guide water pipe 6, and the water storage mechanism includes a collecting water pipe 7 fixedly installed on the guide water pipe 6, and a water storage tank 9 is fixedly installed at the end of the collecting water pipe 7.

[0028] refer to Figure 1 , Figure 2 and Figure 3 The collection mechanism includes a support plate 12, a water storage enclosure 2, a reinforced base plate 13, and a protective net 14;

[0029] A support plate 12 is fixedly connected to the side wall of the wall 11, and steel bars are poured into the support plate 12. This allows the support plate 12 to be stably supported and installed on the wall 11 for stable support. A water storage enclosure 2 is fixedly connected to the support plate 12, and a reinforcing base plate 13 is fixedly connected to the bottom of the water storage enclosure 2. This allows the water storage enclosure 2 to be fixedly installed on the support plate 12 through the reinforcing base plate 13. The reinforcing base plate 13 can reinforce and support the bottom of the water storage enclosure 2. After the reinforcing base plate 13 is fixedly connected to the support plate 12, a waterproof material is fixedly connected between the reinforcing base plate 13 and the support plate 12 to prevent rainwater from seeping out from between the support plate 12 and the reinforcing base plate 13.

[0030] Meanwhile, a protective net 14 is fixedly connected between the water storage enclosure 2 and the building roof 1, so that when the water storage enclosure 2 is in use, rainwater can flow along the building roof 1 into the enclosure of the water storage enclosure 2 during rainy weather, and rainwater can also fall directly into the enclosure of the water storage enclosure 2, thereby achieving the purpose of collecting rainwater. The protective net 14 can block and filter debris in the rainwater flowing on the building roof 1, as well as debris floating in the air, to prevent too much debris from entering the enclosure of the water storage enclosure 2 and causing blockage inside the water storage enclosure 2.

[0031] Secondly, several support frames 15 are fixedly connected between the bottom of the reinforced base plate 13 and the side wall of the wall 11, so that the several support frames 15 can support the water storage enclosure 2 between the wall 11 and the reinforced base plate 13, thereby improving the stability of the water storage enclosure 2.

[0032] refer to Figure 1 , Figure 3 and Figure 4 The water guiding mechanism includes a water leakage hole 16, a connecting water pipe 3, a receiving water pipe 4, a water guiding pipe 6, and a fixing frame 17;

[0033] By providing several drainage holes 16 on the support plate 12, the rainwater collected by the water storage enclosure 2 can be discharged through the drainage holes 16 for collection and treatment. A connecting water pipe 3 is fixedly connected to the bottom of the support plate 12, directly below the drainage holes 16, so that the rainwater discharged from the drainage holes 16 can be discharged by the receiving water pipe 4. A receiving water pipe 4 is fixedly connected to the bottom of the connecting water pipe 3, and a guide pipe 6 is fixedly connected to the bottom of the receiving water pipe 4, so that the rainwater discharged from the connecting water pipe 3 can be discharged and collected by the receiving water pipe 4 and the guide pipe 6 in sequence, thereby achieving the purpose of convenient rainwater collection.

[0034] Meanwhile, several fixing brackets 17 are fixedly connected to the connecting water pipe 3, the receiving water pipe 4, and the guiding water pipe 6, and the fixing brackets 17 are fixedly connected to the wall 11, so that the connecting water pipe 3, the receiving water pipe 4, and the guiding water pipe 6 can be stably supported by several fixing brackets 17 during use, thereby improving the stability of the connecting water pipe 3, the receiving water pipe 4, and the guiding water pipe 6.

[0035] Secondly, the number of drainage holes 16, as well as the connecting water pipes 3, receiving water pipes 4, and water guiding pipes 6, is determined according to the actual usable area of ​​the building roof 1, so that they can be used according to the actual building conditions, which not only saves building construction costs, but also improves rainwater collection efficiency.

[0036] refer to Figure 1 The collection mechanism includes a water collection pipe 7, a water storage tank 9, and a sealing cover 10;

[0037] By fixing a collection pipe 7 to the ends of several water pipes 6, the collected rainwater from the connecting pipe 3, receiving pipe 4 and water pipe 6 is collected in the collection pipe 7 and then transported to the storage tank 9 for storage. The size of the storage tank 9 can be selected according to the local rainfall and household water consumption, so as to facilitate the reuse of rainwater.

[0038] Meanwhile, a sealing cover 10 is screwed onto the top of the water storage tank 9, which makes it easy to protect the inside of the water storage tank 9 through the sealing cover 10 when in use, and also makes it easy to screw the sealing cover 10 open when in use to utilize the rainwater stored in the water storage tank 9.

[0039] Secondly, valves can be installed on the water collection pipe 7 according to usage requirements. Mechanical valves can be selected for manual opening based on rainy weather conditions, or electromagnetic valves can be selected for automatic opening in conjunction with a rainfall monitoring sensor, thereby improving the ease of use of the water storage tank 9.

[0040] Example 2:

[0041] refer to Figure 1 , Figure 4 and Figure 5 The overflow mechanism includes a sealing pipe 18, an overflow pipe 19, and a drain pipe 8;

[0042] By fixing a sealing pipe 18 between the connecting water pipe 3 and the receiving water pipe 4, the sealing pipe 18 can seal and protect the connection between the connecting water pipe 3 and the receiving water pipe 4. Inside the sealing pipe 18, the bottom of the connecting water pipe 3 is inserted into the inside of the receiving water pipe 4, and the top of the receiving water pipe 4 is in an open state. This allows the collected rainwater to be conducted from the connecting water pipe 3 into the inside of the receiving water pipe 4, and the sealing pipe 18 can prevent external debris from entering the receiving water pipe 4.

[0043] Meanwhile, when the water storage tank 9 is full of rainwater, or the valve at the water collection pipe 7 is closed, or the water volume in the receiving pipe 4 is too large and the conduction is insufficient, the excess rainwater in the receiving pipe 4 will overflow from the top of the receiving pipe 4. At the same time, an overflow pipe 19 is fixedly connected to the side wall of the sealing pipe 18, and a drain pipe 8 is fixedly connected to the overflow pipe 19, so that the rainwater overflowing from the top of the receiving pipe 4 will be discharged from the overflow pipe 19 and the drain pipe 8, thereby avoiding serious blockage caused by excessive rainwater in the connecting pipe 3 and the receiving pipe 4.

[0044] Example 3:

[0045] refer to Figure 1 , Figure 4 and Figure 6The filtration mechanism includes a filter box 5, a sealing door 20, a first filter plate 23, a second filter plate 24, a limiting groove 25, a first filter screen 26, and a second filter screen 27.

[0046] By fixing a filter box 5 between the receiving pipe 4 and the guiding pipe 6, and by providing connection ports 21 at both the top and bottom of the filter box 5, the filter box 5 is fixedly connected to the receiving pipe 4 through the connection port 21 at the top and to the guiding pipe 6 through the connection port 21 at the bottom. This allows the receiving pipe 4 and the guiding pipe 6 to pass through the interior of the filter box 5 when conducting rainwater, thus facilitating the filtration of rainwater by the filter box 5.

[0047] Meanwhile, several mounting slots 22 are provided inside the filter box 5, allowing the filter box 5 to be slidably connected to the first filter plate 23 and the second filter plate 24 through the mounting slots 22 respectively. Limiting grooves 25 are provided on both the first filter plate 23 and the second filter plate 24. A first filter screen 26 is fixedly connected in the limiting groove 25 of the first filter plate 23, and a second filter screen 27 is fixedly connected in the limiting groove 25 of the second filter plate 24. The aperture of the first filter screen 26 is larger than that of the second filter screen 27, so that when rainwater passes through the inside of the filter box 5, the first filter screen 26 and the second filter screen 27 can perform secondary and tertiary filtration on the collected rainwater respectively. The primary filtration is completed by the protective net 14, thereby improving the cleanliness of the collected rainwater and facilitating the reuse of the collected rainwater.

[0048] Secondly, during the use of the first filter plate 23 and the second filter plate 24, the debris filtered by the first filter screen 26 and the second filter screen 27 can be collected in the limiting groove 25. After the first filter plate 23 and the second filter plate 24 have been used for a long time, the sealing door 20 on the side wall of the filter box 5 can be opened to slide the first filter plate 23 and the second filter plate 24 out of the mounting groove 22 and clean the debris in the limiting groove 25. This facilitates the long-term filtration work of the first filter plate 23 and the second filter plate 24. When the first filter plate 23 and the second filter plate 24 are damaged, they can also be easily disassembled and replaced by opening the sealing door 20 and sliding through the mounting groove 22.

[0049] Working principle: Rainwater is collected on the surface of the building roof 1 and falls naturally down the slope to a collection mechanism fixed to the outside of the wall 11. This mechanism mainly consists of a water-storing enclosure 2 supported by a support plate 12. A protective net 14 is installed between the enclosure and the edge of the building roof 1 to intercept larger debris such as leaves and branches before the rainwater enters the enclosure area, completing the initial filtration. The collected rainwater is temporarily stored in the shallow pool formed by the water-storing enclosure 2, and then discharged downwards through multiple drainage holes 16 evenly opened on the support plate 12. A connecting water pipe 3 is vertically connected directly below the drainage holes 16, through which the rainwater is introduced into a vertically arranged pipe system. The bottom of the connecting water pipe 3 extends into the larger diameter receiving water pipe 4 below, and the connection between the two is sealed by a sealing pipe 18. The enclosure forms a sealed space to prevent debris from entering and constitutes a key part of the overflow structure. When water flows into the receiving pipe 4 through the connecting water pipe 3, if the downstream flow is smooth, the rainwater will continue to flow downwards. If the downstream flow is obstructed due to the water tank 9 being full or the valve installed on the collecting water pipe 7 being closed, or if the instantaneous rainfall is too large and exceeds the drainage capacity of the downstream pipe, the water level in the receiving pipe 4 will rise until it overflows from its top opening. The overflowing rainwater then enters the cavity of the sealed pipe 18 and is safely discharged from the system through the overflow pipe 19 connected to its side wall and the drain pipe 8 connected to it. This effectively avoids the risk of blockage caused by excessive internal pressure or backflow of water in the pipeline system. The rainwater that flows smoothly downwards flows out from the bottom of the receiving pipe 4 and enters the fixed connection. The filter box 5 has a top connection port 21. As the core filtration unit, the filter box 5 has a first filter plate 23 and a second filter plate 24 that are slidably installed inside along the water flow direction. The first filter screen 26 and the second filter screen 27 are fixed by limiting grooves 25, respectively. The pore size of the first filter screen 26 is larger than that of the second filter screen 27, thus achieving gradient precision filtration of rainwater: firstly, the first filter screen 26 intercepts medium-sized particulate impurities, and then the second filter screen 27 filters out finer suspended solids, thereby significantly improving water quality. The filtered clean water enters the water guide pipe 6 through the bottom connection port 21 of the filter box 5. Multiple water guide pipes 6 can collect rainwater from different collection points into the collection water pipe 7, and finally deliver it to the water storage tank 9. The water storage tank 9 is sealed with a cap 10 on top to prevent contamination and facilitate water access. The entire piping system is secured to the wall 11 by multiple brackets 17. The water storage enclosure 2 is reinforced to the wall 11 and support plate 12 by a reinforced base plate 13 and additional support frame 15, ensuring the stability and safety of the overall structure during long-term use. When the filter screen needs to be cleaned or replaced, the sealed door 20 on the side wall of the filter box 5 can be opened to slide out the first filter plate 23 and the second filter plate 24 along the mounting groove 22 for maintenance. The system has a coherent process design, integrating collection, diversion, overflow protection, multi-stage filtration and storage, realizing efficient, controllable and clean collection and utilization of roof rainwater.

[0050] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A roof rainwater harvesting and utilization system for buildings, comprising a wall (11) on which a building roof (1) is fixedly installed, characterized in that, Also includes: The collection mechanism is fixedly installed on the wall (11) for rainwater collection. The collection mechanism includes a support plate (12) fixedly installed on the wall (11), a water storage enclosure (2) fixedly installed on the support plate (12), and a protective net (14) fixedly installed between the water storage enclosure (2) and the building roof (1). A water guiding mechanism is fixedly installed at the bottom of the support plate (12) for collecting rainwater collected by the mechanism. The water guiding mechanism includes several drainage holes (16) opened on the support plate (12). Several connecting water pipes (3) are fixedly installed at the bottom of the support plate (12) below the drainage holes (16). A receiving water pipe (4) is fixedly installed at the bottom of the connecting water pipes (3). A water guiding pipe (6) is fixedly installed at the bottom of the receiving water pipe (4). An overflow mechanism is fixedly installed between the connecting water pipe (3) and the receiving water pipe (4). The overflow mechanism includes a sealing pipe (18) fixedly installed between the connecting water pipe (3) and the receiving water pipe (4). An overflow pipe (19) is fixedly installed on the sealing pipe (18). The filtration mechanism is fixedly installed between the receiving water pipe (4) and the guiding water pipe (6). The filtration mechanism includes a filter box (5) fixedly installed between the receiving water pipe (4) and the guiding water pipe (6). A first filter plate (23) and a second filter plate (24) are slidably installed inside the filter box (5). A water storage mechanism is located below the water pipe (6). The water storage mechanism includes a water collection pipe (7) fixedly installed on the water pipe (6), and a water storage tank (9) is fixedly installed at the end of the water collection pipe (7).

2. The roof rainwater harvesting and utilization system for buildings according to claim 1, characterized in that, The collection mechanism also includes a reinforcing base plate (13) fixedly installed at the bottom of the water storage enclosure (2), and the water storage enclosure (2) is fixedly installed on the support plate (12) by the reinforcing base plate (13); Furthermore, a waterproof material is fixedly installed between the reinforced base plate (13) and the support plate (12).

3. A roof rainwater harvesting and utilization system for buildings according to claim 2, characterized in that, The collection mechanism also includes several support frames (15) fixedly installed between the bottom of the reinforced base plate (13) and the side wall of the wall (11).

4. A roof rainwater harvesting and utilization system for buildings according to claim 1, characterized in that, The water guiding mechanism also includes several fixing frames (17) fixedly installed on the connecting water pipe (3), the receiving water pipe (4) and the guiding water pipe (6), and the fixing frames (17) are fixedly installed on the wall (11).

5. A roof rainwater harvesting and utilization system for buildings according to claim 1, characterized in that, The overflow mechanism also includes a drain pipe (8) fixedly installed on the overflow pipe (19), and the overflow pipe (19) and the drain pipe (8) are internally connected.

6. A roof rainwater harvesting and utilization system for buildings according to claim 5, characterized in that, The overflow mechanism also includes a connecting water pipe (3) whose bottom is inserted into the receiving water pipe (4), and the receiving water pipe (4) has an open structure at the top.

7. A roof rainwater harvesting and utilization system for buildings according to claim 1, characterized in that, The filtration mechanism also includes several mounting slots (22) opened inside the filter box (5), and the first filter plate (23) and the second filter plate (24) are slidably disposed inside the filter box (5) through the mounting slots (22); The first filter plate (23) and the second filter plate (24) are provided with limiting grooves (25). The first filter plate (23) is fixedly provided with a first filter screen (26) through the limiting groove (25), and the second filter plate (24) is fixedly provided with a second filter screen (27) through the limiting groove (25).

8. A roof rainwater harvesting and utilization system for buildings according to claim 7, characterized in that, The filtration mechanism also includes connection ports (21) at the top and bottom of the filter box (5). The filter box (5) is fixedly connected to the receiving water pipe (4) through the connection port (21) at the top, and the filter box (5) is fixedly connected to the water guide pipe (6) through the connection port (21) at the bottom. The filter box (5) is provided with a rotatable sealing door (20) on its side wall.

9. A roof rainwater harvesting and utilization system for buildings according to claim 1, characterized in that, The water storage mechanism also includes a sealing cap (10) screwed onto the top of the water storage tank (9).

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