A rainwater harvesting tank

Abstract

The utility model relates to water resource recycling equipment technical field more specifically, relate to a rainwater collecting pool, include: pool body, be located in the road surface below, support module, be located in the middle part of pool body to the pool body is divided out and uses the pool, support module is equipped with the water storage pool in, the water inlet of water storage pool links to each other with the water inlet pool, the water outlet of water storage pool links to each other with the water pool, water inlet, the water inlet pool is connected, is used for connecting rainwater collecting pipeline, the drain, the water inlet pool is connected, the water inlet is located in the below of drain. The utility model has solved the problem that the water purification effect is not good in the prior art rainwater collecting process, limits the use of the rainwater after recycling.

Description

Technical Field

[0001] This utility model relates to the technical field of water resource recycling equipment, and more specifically, to a rainwater collection tank. Background Technology

[0002] The recycling of various water resources is an important part of green and environmentally friendly construction. Among the many water resources, rainwater, as a free resource, is relatively cleaner than domestic wastewater and is easy to collect using existing municipal pipeline networks, thus having a clear advantage in promoting rainwater recycling.

[0003] Currently, rainwater harvesting ponds are typically built in non-vehicle or pedestrian areas, such as under green spaces. Due to space constraints, their internal filtration structures are limited, with existing technology usually employing a filter screen at the inlet. However, if the filter pores are too fine, the inlet is prone to clogging, requiring frequent cleaning. Otherwise, during rainy days, clogging can lead to slow drainage and road flooding. Conversely, if the filter pores are too large, insoluble or floating debris, such as styrofoam particles, sand, and cigarette butts, can easily enter the harvesting pond directly. Especially small floating objects and oil films cannot be filtered by the screen, severely impacting rainwater purification. This not only leads to a large accumulation of impurities in the difficult-to-clean harvesting pond, increasing maintenance frequency and costs, but also results in poor rainwater cleanliness, limiting the uses of the collected rainwater. Utility Model Content

[0004] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide a rainwater collection tank to solve the problem of poor water purification effect in the existing rainwater collection process, which limits the use of the collected rainwater.

[0005] The technical solution adopted by this utility model is a rainwater collection tank, which includes:

[0006] The pool is located below the road surface;

[0007] A support module is located in the middle of the pool body, dividing the pool body into an inlet pool and a water consumption pool; a water storage pool is provided inside the support module, the inlet of the water storage pool is connected to the inlet pool; the outlet of the water storage pool is connected to the water consumption pool.

[0008] The inlet is connected to the water inlet pool and is used to connect to the rainwater collection pipeline;

[0009] A drain outlet is connected to the water inlet pool, and the water inlet is located below the drain outlet.

[0010] In this invention, a support module and partition wall are installed within the large-span storage tank in the middle of the pool body, dividing the rainwater collection tank into three functional chambers. This provides internal support for the rainwater collection tank and expands its construction location, allowing it to be placed in pedestrian areas or even vehicular areas (such as roads, parking lots, and green areas). The division of functional chambers ensures that rainwater entering the collection tank from external rainwater collection pipes undergoes effective filtration while adapting to different rainfall amounts. In cases of excessive rainfall, the water can be immediately discharged into the municipal pipe network through the inlet tank, ensuring the quality of the filtered rainwater. Only rainwater that has been completely filtered—that is, after initial filtration in the inlet tank and subsequent settling in the storage tank—is utilized after entering the inlet tank. This ensures the quality of the treated rainwater, resulting in higher purity, greater applicability, and wider applications. Furthermore, after initial dynamic sedimentation in the inlet tank, the rainwater undergoes further static sedimentation filtration in the storage tank, thus improving the quality of the rainwater through double filtration. By placing the inlet below the outlet, it can effectively address the problem of excessive water flow, first discharge floating debris in the inlet pool, and also filter rainwater entering the pool from the outside rainwater pipe, so that the water passing through the collection pool can remove sediment and impurities to a certain extent.

[0011] Preferably, the inlet and the outlet are located on the upper part of the water inlet pool and have different orientations; the inlet is located above the side of the water storage pool near the water inlet pool, and is located below the outlet and the inlet.

[0012] In this invention, by placing the inlet and outlet on the inlet pool, rainwater is ensured to flow directly into the pool through the inlet. In cases of insufficient rainwater, sedimentation occurs first, initially reducing sediment. In cases of sufficient rainwater, the rainwater is promptly filtered and converted into relatively high-quality recycled water. When rainwater is excessive, it is discharged promptly through the outlet, preventing the slow filtration in the collection pool from obstructing rainwater drainage from the road surface. This not only helps ensure water quality but also prevents excessive water flow from affecting the purification effect, guaranteeing the water quality in the pool. The inlet flows into the storage tank, achieving a second stage of sedimentation and settling. A PP material support module quickly reduces the water flow rate, further improving purification efficiency and providing a more stable sedimentation and storage space to separate tiny suspended impurities. By rationally designing the positions of the inlet, outlet, and outlet, the water flow path is optimized, naturally separating floating debris and grease from the stored water, thus improving the rainwater purification effect.

[0013] Preferably, the inlet is equipped with a valve, the valve including a buoyancy triggering structure, the buoyancy triggering structure is used to drive the valve to open after the water level is higher than the valve opening, so as to ensure that the valve inlet is always below the water surface.

[0014] By installing a valve on the inlet and a buoyancy triggering structure above the valve, the automatic opening and closing control of the inlet based on water level changes is achieved. This allows the inlet to draw water from below the water surface, removing floating debris and effectively preventing floating impurities from entering the water storage tank with the water flow and affecting the rainwater purification effect. The inlet tank simultaneously achieves dual filtration of floating debris and sediment, further improving the water purification effect.

[0015] Preferably, the valve is a gate valve that moves up and down to open, and the gate valve is opened by buoyancy and closed by gravity; the buoyancy triggering structure is a float, which is located at the top of the gate valve and connected to the gate plate of the gate valve; the maximum position of the float is lower than the drain outlet.

[0016] By setting the buoyancy triggering structure to a low-density float and controlling its maximum rising position to be below the drain outlet, the valve limiting device ensures the stability of the float itself. Secondly, it can automatically adjust its height according to water level changes, quickly responding to rises and falls in water level, achieving precise valve control without the need for electrical control detection. Since the float is located above the gate, when the water level in the inlet pool reaches the inlet, the valve does not open, effectively preventing surface impurities from entering the storage tank. When the water level in the inlet pool exceeds the inlet but does not exceed the drain outlet, the valve will slowly open from bottom to top under the action of the buoyancy triggering structure. At this time, the area below the water surface in the inlet pool is connected to the storage tank. Regardless of the situation, as long as the water level drops, the buoyancy triggering structure will promptly adjust the gate height to prevent floating impurities from entering. When the water level exceeds the drain outlet, floating debris is discharged from the inlet pool's drain outlet into the municipal sewer network. This inlet valve features a simple and reliable structure that enables automatic water intake from below the water surface. This effectively prevents floating impurities from entering the water storage tank with the water flow, thus avoiding impacting the rainwater purification effect. It also reduces maintenance costs and enhances the stability and long-term benefits of the system.

[0017] Preferably, the water outlet is located at the lower part of the water storage tank, and there is a gap between it and the bottom of the water storage tank.

[0018] During the settling process, solid impurities and sediments in the water storage tank naturally settle to the bottom. If the outlet were in direct contact with the bottom, these sediments might be carried into the water tank with the water flow, affecting water quality. Therefore, an intermittent outlet is designed to raise the outlet height and prevent bottom sediments from entering the water tank, thus ensuring water quality in the water tank. The outlet design ensures that only the cleaner upper layer of water is output, leaving sediments at the bottom of the storage tank. This helps improve water purification efficiency and prevents impurities from being carried out with the water flow, optimizing the water purification process.

[0019] Preferably, the rainwater collection tank further includes a drain outlet with a control valve, the drain outlet being located at the lower part of the support module and connecting the bottom of the inlet tank and the storage tank.

[0020] The drainage outlet allows sediment and impurities at the bottom of the storage tank to be discharged, ensuring that the water flowing into the water tank from the outlet is clean. This effectively prevents sediment from accumulating at the bottom of the storage tank and entering the water tank through the outlet, thus affecting the rainwater purification effect. Furthermore, placing the drainage outlet in the inlet further maintains the cleanliness of the water tank, concentrating maintenance efforts in the inlet and reducing the maintenance required for the water tank, which also facilitates the cleaning of the rainwater harvesting tank.

[0021] Preferably, the rainwater collection tank is further provided with a basket, which is located at the bottom of the inlet tank and is used to collect the sediment discharged from the outlet.

[0022] By installing a basket at the bottom of the inlet tank, sediment discharged from the drain outlet can be effectively collected. When sediment in the storage tank is discharged through the drain outlet, the basket captures and collects solid impurities and dirt settling at the bottom, preventing these sediments from directly entering the inlet tank and accumulating in hard-to-clean corners. This reduces the difficulty of maintenance and cleaning, enabling rapid cleaning and effectively improving maintenance efficiency. In this way, the basket acts as a filter and collector, helping to reduce the workload of later maintenance, extend the service life of the equipment, and ensure the long-term purification effect of the water. In practice, the inlet tank can be equipped with a portal for personnel to enter and clean, or a robot can be used to enter the inlet tank along the pipes for cleaning operations.

[0023] Preferably, a sewage pump is provided in the water inlet pool, the sewage pump is connected to the bottom of the water inlet pool and the water inlet, and is used to discharge sewage in the water inlet pool. The sewage pump is located outside the basket.

[0024] By installing a sewage pump and connecting it to the bottom of the inlet tank and the inlet, the sewage and impurities collected in the inlet tank can be quickly discharged to the outside using existing pipes, enabling a certain degree of rapid cleaning and extending the maintenance cycle. Simultaneously, positioning the sewage pump outside the basket, and setting it higher than the basket but slightly lower than the drain outlet, reduces the likelihood of pump failure and prevents excessively large impurities from entering the pump, thus ensuring its normal operation.

[0025] Preferably, the water tank is equipped with a clean water pump, which is connected to an external water pipe for completely emptying the water tank.

[0026] By installing a clean water pump, the filtered rainwater in the water tank can be drained, and the water in the water tank can be pressurized and supplied to the greywater network. This ensures that the collected rainwater can be better used for non-potable purposes such as irrigation, toilet flushing, landscaping, and ground cleaning, thus achieving the goals of water conservation and sustainable development.

[0027] Preferably, the support module includes:

[0028] An outer shell, used to form the surface covering of the water storage tank;

[0029] Several supporting structures are located within the water storage tank to form a support module for the road surface.

[0030] In this application, by setting an outer shell to cover and form the surface of the water storage tank, the components inside the cavity can be protected from the influence of the external environment, ensuring their normal operation. At the same time, several support structures are set inside the water storage tank, which can provide sufficient support for the road surface, help to disperse external pressure, prevent the road surface from deforming or being damaged due to excessive load, and ensure the stability of water flow inside the cavity and the long-term durability of the water purification equipment. This improves the load-bearing capacity and safety of the entire rainwater collection tank. Furthermore, the support structure can effectively reduce the water flow velocity when water enters and exits, thereby further improving the purification effect.

[0031] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0032] In this invention, by setting a support module in the middle of the pool body, the rainwater collection pool is not only divided into three functional chambers (front and rear), but also provides internal support, expanding the construction location of the rainwater collection pool so that it can be placed in pedestrian areas or even vehicular areas. The division of functional chambers ensures that rainwater entering the collection pool from external rainwater collection pipes undergoes effective filtration while adapting to different rainfall amounts. In cases of excessive rainfall, the water can be immediately discharged through the inlet pool, ensuring the quality of the filtered rainwater. Only rainwater that has been completely filtered—that is, passed through both the inlet pool and the support module—is utilized after entering the inlet pool, thus guaranteeing the quality of the treated rainwater, resulting in higher purity, greater applicability, and wider applications.

[0033] Furthermore, the system employs a dual filtration system—an inlet tank and a storage tank—to improve rainwater quality. This ensures sufficient sedimentation space even under high flow rates, helping to remove larger particles and impurities. It also reduces flow velocity and extends sedimentation time, effectively enhancing water purification. By placing the inlet below the outlet, it effectively accommodates excessive water volume and filters rainwater entering the tank from external pipes. Utilizing buoyancy, water is drawn below the surface, preventing small floating particles from entering the storage tank and extending its sludge removal cycle. This ensures that both floating and settling impurities are removed from the water entering the tank, guaranteeing water quality. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0035] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0036] Figure 3 This is a schematic diagram of the valve structure of this utility model.

[0037] Attached diagram descriptions: 1. Pool body; 2. Support module; 3. Inlet pool; 4. Water pool; 5. Storage pool; 6. Inlet; 7. Outlet; 8. Drainage outlet; 9. Inlet; 10. Valve; 11. Buoyancy triggering structure; 12. Sewage outlet; 13. Basket; 14. Sewage pump; 15. Clean water pump; 16. Outer shell; 17. Support structure. Detailed Implementation

[0038] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0039] Example 1

[0040] like Figure 1-3 As shown, the technical solution adopted in this embodiment is a rainwater collection tank, which includes:

[0041] Pool 1 is located below the road surface;

[0042] A support module 2 is located in the middle of the pool body 1 and divides the pool body 1 into an inlet pool 3 and a water tank 4; a water storage pool 5 is provided inside the support module 2, and the inlet 9 of the water storage pool 5 is connected to the inlet pool 3; the outlet 7 of the water storage pool 5 is connected to the water tank 4.

[0043] Water inlet 6 is connected to the water inlet pool 3 and is used to connect to the rainwater collection pipeline;

[0044] Drainage outlet 8 is connected to the water inlet pool 3, and water inlet 9 is located below drainage outlet 8.

[0045] In this invention, a support module 2 and partition walls are installed in the large-span water storage tank in the middle of the pool body 1, dividing the rainwater collection tank into three functional chambers. This provides internal support for the rainwater collection tank and expands its construction location, allowing it to be placed in pedestrian areas or even vehicular areas (such as roads, parking lots, green areas, etc.). The division of functional chambers ensures that after the rainwater enters the rainwater collection tank from the external rainwater collection pipes, it can be effectively filtered while adapting to different rainfall amounts. In case of excessive rainfall, it can be immediately discharged into the municipal pipe network through the inlet tank 3, while also ensuring the quality of the filtered rainwater. Only rainwater that has been completely filtered—that is, after preliminary filtration through the inlet tank 3 and then settling in the storage tank 5—is used after entering the inlet tank 3. This ensures the quality of the treated rainwater, making the filtered rainwater purer, more applicable, and more versatile.

[0046] Furthermore, after initial filtration and dynamic sedimentation in the inlet tank 3, the rainwater then enters the storage tank 5 for further static sedimentation and filtration. This double filtration helps improve the quality of the rainwater. By placing the inlet 9 below the outlet 8, it can effectively accommodate excessive water flow and also filter rainwater entering the tank from external rainwater pipes, allowing the water passing through the collection tank to remove sediment and impurities to a certain extent.

[0047] Preferably, the inlet 6 and the outlet 8 are located on the upper part of the water inlet pool 3 and have different orientations; the inlet 9 is located above the side of the water storage pool 5 near the water inlet pool 3, and is located below the outlet 8 and the inlet 6.

[0048] In this invention, by placing the inlet 6 and outlet 8 on the inlet pool 3, rainwater from the outside flows directly into the inlet pool 3 through this inlet. When rainwater is insufficient, sedimentation occurs first, initially reducing the amount of sediment in the rainwater. When rainwater is plentiful, it can be filtered in time and converted into relatively high-quality recycled water. When rainwater is excessive, it can be discharged promptly from the outlet 8, preventing the slow filtration of the collection pool from obstructing rainwater drainage from the road surface. This not only helps ensure the quality of purified water but also prevents excessive water flow from affecting the purification effect, ensuring the water quality of the water tank. The inlet 9 flows into the storage pool 5, achieving a second stage of sedimentation and settling. A PP material support module 2 is used to quickly reduce the water flow rate, further improving the water purification efficiency and providing a more stable sedimentation and storage space to separate tiny suspended impurities in the water. By rationally designing the positions of the inlet 6, outlet 8, and inlet 9, the water flow path is optimized, naturally separating floating debris and grease from the stored water, thus improving the rainwater purification effect.

[0049] Preferably, the inlet 9 is provided with a valve 10, the valve 10 including a buoyancy triggering structure 11, the buoyancy triggering structure 11 is used to drive the valve 10 to open after the water level is higher than the opening of the valve 10, so as to realize that the inlet of the valve 10 is always below the water surface.

[0050] By setting a valve 10 on the inlet 9 and a buoyancy triggering structure 11 above the valve 10, the automatic opening and closing control of the inlet 9 based on water level changes is realized. This allows the inlet 9 to draw water from below the water surface and remove floating objects, effectively preventing floating impurities from entering the water storage tank 5 with the water flow and affecting the rainwater purification effect. In the water inlet tank 3, dual filtration of floating debris and sediment is realized at the same time, further improving the water purification effect.

[0051] Preferably, the valve 10 is a gate valve that moves up and down to open, and the gate valve is opened by buoyancy and closed by gravity; the buoyancy triggering structure 11 is a float, which is located at the top of the gate valve and connected to the gate plate of the gate valve; the maximum position of the float is lower than the drain outlet 8.

[0052] By setting the buoyancy trigger structure 11 as a low-density float and controlling its maximum rising position to be lower than the drain outlet 8, the valve disc limiting device can ensure the stability of the float itself. Secondly, it can also achieve self-adjustment of height according to water level changes, quickly responding to water level rises and falls, and achieving precise valve control without the need for electrical control detection. Since the float is located above the gate, when the water level in the inlet pool 3 reaches the inlet 9, the valve 10 does not open, effectively preventing surface impurities from entering the storage pool 5. When the water level in the inlet pool 3 exceeds the inlet 9 but does not exceed the drain outlet 8, the valve 10 will slowly open from bottom to top under the action of the buoyancy trigger structure 11. At this time, the water surface below the inlet pool 3 connects to the storage pool 5. Regardless of the situation, as long as the water level drops, the buoyancy trigger structure 11 will promptly adjust the gate height to prevent floating impurities from entering. When the water level exceeds the drain outlet 8, floating debris is discharged from the drain outlet 8 of the inlet pool 3 into the municipal pipe network. The inlet valve features a simple and reliable structure that enables automatic water intake from below the water surface. This effectively prevents floating impurities from entering the water storage tank 5 with the water flow, thus avoiding impacts on rainwater purification. It also reduces maintenance costs and enhances the stability and long-term benefits of the system.

[0053] Preferably, the water outlet 7 is located at the lower part of the water storage tank 5, and there is a gap between it and the bottom of the water storage tank 5.

[0054] During the settling process, solid impurities and sediments in the water storage tank 5 naturally settle to the bottom. If the outlet 7 were in direct contact with the bottom, these sediments might be discharged into the water tank 4 along with the water flow, affecting water quality. Therefore, an interval is designed to prevent bottom sediments from entering the water tank by raising the outlet height, thus ensuring the water quality in the water tank. The outlet 7 ensures that only the relatively clean water from the upper layer is output, leaving sediments at the bottom of the storage tank. This helps improve water purification efficiency and prevents impurities from being discharged with the water flow, optimizing the water purification process.

[0055] Preferably, the rainwater collection tank further includes a drain outlet 12 with a control valve, the drain outlet 12 being located at the lower part of the support module 2 and connecting the bottom of the inlet tank and the storage tank 5.

[0056] The drain outlet 12 is designed to remove sediment and impurities from the bottom of the water storage tank 5, ensuring that the water flowing into the water tank 4 from the outlet 7 is clean. This effectively prevents sediment from accumulating at the bottom of the water storage tank 5 and entering the water tank 4 through the outlet 7, thus affecting the rainwater purification effect. Furthermore, placing the drain outlet 12 in the inlet tank 3 further maintains the cleanliness of the water tank, concentrating maintenance efforts in the inlet tank 3, reducing the maintenance required for the water tank, and facilitating the cleaning of the rainwater harvesting tank.

[0057] Preferably, the rainwater collection tank is further provided with a basket 13, which is located at the bottom of the inlet tank and is used to collect the sediment discharged from the drain outlet 12.

[0058] By installing a basket 13 at the bottom of the inlet pool, sediment discharged from the drain outlet 12 can be effectively collected. When sediment in the storage tank 5 is discharged through the drain outlet 12, the basket 13 captures and collects the solid impurities and dirt settling at the bottom, preventing these sediments from directly entering the inlet pool 3 and accumulating in hard-to-clean corners. This reduces the difficulty of maintenance and cleaning, enables rapid cleaning, and effectively improves maintenance efficiency. In this way, the basket acts as a filter and collector, helping to reduce the workload of later maintenance, extend the service life of the equipment, and ensure the long-term purification effect of the water. In practice, the inlet pool 3 can be equipped with a portal for personnel to enter and clean it. Alternatively, a robot can enter the inlet pool 3 along the pipes for cleaning operations.

[0059] Preferably, the inlet pool is equipped with a sewage pump 14, which is connected to the bottom of the inlet pool and the inlet 6, and is used to discharge sewage in the inlet pool. The sewage pump 14 is located outside the basket 13.

[0060] By installing a sewage pump 14 and connecting it to the bottom of the inlet pool 3 and the inlet 6, the sewage and impurities collected in the inlet pool 3 can be quickly discharged to the outside using existing pipes, allowing for a certain degree of rapid cleaning and extending the maintenance cycle. Simultaneously, positioning the sewage pump 14 outside the basket 13, and setting it higher than the basket but slightly lower than the drain outlet, reduces the likelihood of pump malfunctions and prevents excessively large impurities from entering the pump, thus ensuring its normal operation.

[0061] Preferably, the water tank 4 is equipped with a clean water pump 15, which is connected to an external water pipe for completely emptying the water tank 4.

[0062] By installing a clean water pump 15, the filtered rainwater in the water tank 4 can be drained, and the water in the water tank can be pressurized and supplied to the greywater network. This ensures that the collected rainwater can be better used for non-potable purposes such as irrigation, toilet flushing, landscaping, and ground cleaning, thereby achieving the goals of water conservation and sustainable development.

[0063] Preferably, the support module 2 includes:

[0064] The outer shell 16 is used to form the surface covering of the water storage tank 5;

[0065] Several support structures 17 are provided in the water storage tank 5 to form support modules for the road surface.

[0066] In this application, by setting an outer shell 16 to cover and form the surface of the water storage tank 5, the components inside the cavity can be protected from the influence of the external environment, ensuring their normal operation. At the same time, several support structures 17 are set inside the water storage tank 5, which can provide sufficient support for the road surface, help to disperse external pressure, prevent the road surface from deforming or being damaged due to excessive load, and ensure the stability of water flow inside the cavity and the long-term durability of the water purification equipment, thereby improving the load-bearing capacity and safety of the entire rainwater collection tank. Furthermore, the support structure 17 can also effectively reduce the water flow velocity when water enters and exits, thereby further improving the purification effect.

[0067] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rainwater collection tank, characterized in that, The rainwater collection tank includes: The pool body (1) is located below the road surface; A support module (2) is located in the middle of the pool body (1) and divides the pool body (1) into an inlet pool (3) and a water pool (4); a water storage pool (5) is provided inside the support module (2), and the inlet (9) of the water storage pool (5) is connected to the inlet pool (3); the outlet (7) of the water storage pool (5) is connected to the water pool (4); The inlet (6) is connected to the water inlet pool (3) and is used to connect to the rainwater collection pipeline; The drain outlet (8) is connected to the water inlet pool (3), and the water inlet (9) is located below the drain outlet (8).

2. A rainwater collection tank according to claim 1, characterized in that, The inlet (6) and the outlet (8) are located on the upper part of the water inlet pool (3) and face different directions; the inlet (9) is located on the upper side of the water storage pool (5) near the water inlet pool (3) and is located below the outlet (8) and the inlet (6).

3. A rainwater harvesting tank according to claim 2, characterized in that, The inlet (9) is equipped with a valve (10), which includes a buoyancy triggering structure (11). The buoyancy triggering structure (11) is used to drive the valve (10) to open after the water level is higher than the opening of the valve (10), so that the valve inlet is always below the water surface.

4. A rainwater harvesting tank according to claim 3, characterized in that, The valve (10) is a gate valve that moves up and down to open. The gate valve is opened by buoyancy and closed by gravity. The buoyancy triggering structure (11) is a float. The float is located at the top of the gate valve and is connected to the gate plate of the gate valve. The maximum position of the float is lower than the drain outlet (8).

5. A rainwater collection tank according to claim 1, characterized in that, The outlet (7) is located at the lower part of the water storage tank (5) and there is a gap between it and the bottom of the water storage tank (5).

6. A rainwater harvesting tank according to any one of claims 1-5, characterized in that, The rainwater collection tank also includes a drain outlet (12) with a control valve. The drain outlet (12) is located at the bottom of the support module (2) and connects to the bottom of the inlet tank and the storage tank (5).

7. A rainwater harvesting tank according to claim 6, characterized in that, The rainwater collection pool is also equipped with a basket (13), which is located at the bottom of the inlet pool and is used to collect the sediment discharged from the drain (12).

8. A rainwater harvesting tank according to claim 7, characterized in that, The inlet pool is equipped with a sewage pump (14), which connects the bottom of the inlet pool and the inlet (6) to discharge sewage from the inlet pool. The sewage pump (14) is located outside the basket (13).

9. A rainwater harvesting tank according to any one of claims 1-5, characterized in that, The water tank (4) is equipped with a clean water pump (15), which is connected to an external water pipe for completely emptying the water tank (4).

10. A rainwater harvesting tank according to any one of claims 1-5, characterized in that, The support module (2) includes: The outer shell (16) is used to form the surface covering of the water storage tank (5); Several support structures (17) are provided in the water storage tank (5) to form support modules for the road surface.

Images