Rainwater vertical pipe system and intelligent diversion method

Abstract

The application provides a rainwater vertical pipe system and an intelligent distribution method, and belongs to the technical field of water conservancy facilities. The rainwater vertical pipe system comprises a water inlet cylinder, a vertical pipe, a siphon pipe, a filter cylinder and a floating ball assembly. The water inlet cylinder is vertically or obliquely buried in a working surface, and the lower end is closed, the upper end is provided with a water inlet, and the middle part is provided with a drainage port. The upper end of the vertical pipe is connected with the drainage port of the water inlet cylinder for drainage. The siphon pipe crosses the drainage port, and the two ends are located in the bottom of the drainage port and the vertical pipe respectively. The filter cylinder is slidingly arranged in the water inlet cylinder, and the top is provided with a sundry containing pocket structure for containing sundries. The containing pocket structure closes the top of the filter cylinder. The floating ball assembly is arranged in the water inlet cylinder and connected with the lower part of the filter cylinder. The intelligent distribution method applies the above rainwater vertical pipe system. The application can effectively ensure smooth drainage of the rainwater vertical pipe, avoid sundries entering the rainwater vertical pipe, realize intelligent distribution of rainwater, and reasonably utilize.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water conservancy facilities, and more particularly to a rainwater vertical pipe system and an intelligent diversion method. BACKGROUND

[0002] At present, many buildings are provided with rainwater vertical pipes to drain rainwater on the ground of the roof or terrace. However, due to the long-term exposure of the roof or ground, a large amount of dust, leaves, plastic bags and other sundries are often accumulated. When it rains, the rainwater that washes the roof or ground will flush these sundries into the rainwater vertical pipe. On the one hand, these sundries entering the rainwater vertical pipe can easily cause blockage, affecting drainage. On the other hand, many rainwater vertical pipes are connected with rainwater pipe networks for collecting rainwater. These sundries entering the rainwater pipe network can not only cause blockage of the rainwater pipe network, but also increase the difficulty of rainwater purification treatment.

[0003] In order to solve these problems, a grating is usually arranged at the water inlet of the rainwater vertical pipe to filter out some large sundries. However, once the rainwater is a little more, these sundries will be attached to the grating due to water pressure, thereby blocking the water inlet of the rainwater vertical pipe and affecting drainage. In addition, regular cleaning of the roof or ground can also solve this problem to some extent. However, this method is labor-intensive, and it is difficult to clean some roofs and floors without access. SUMMARY

[0004] The present application aims to provide a rainwater vertical pipe system and an intelligent diversion method to solve the technical problem that there is no better way to effectively ensure smooth drainage of the rainwater vertical pipe while avoiding sundries from entering the rainwater vertical pipe in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide a rainwater vertical pipe system, which comprises a water inlet cylinder, a vertical pipe, a siphon pipe, a filter cylinder and a floating ball assembly. The water inlet cylinder is vertically or obliquely buried in a working surface, and the lower end is closed, the upper end is provided with a water inlet, and the middle part is provided with a drainage port. The upper end of the vertical pipe is connected with the drainage port of the water inlet cylinder for drainage. The siphon pipe crosses the drainage port, and the two ends are located at the bottom of the drainage port and in the vertical pipe, respectively. The filter cylinder is slidingly arranged in the water inlet cylinder, and the top is provided with a sundry containing pocket structure for containing sundries. The containing pocket structure closes the top of the filter cylinder. The floating ball assembly is arranged in the water inlet cylinder and connected with the lower part of the filter cylinder. When the water level in the lower part of the water inlet cylinder rises, the upper part of the filter cylinder protrudes out of the water inlet. When the water level in the lower part of the water inlet cylinder falls, the upper part of the filter cylinder enters the water inlet.

[0006] In one possible implementation, based on the above technical solutions, the inlet cylinder is provided with a limiting claw. The filter cylinder includes a receiving pocket structure, a limiting ring, and multiple sliding rods. The multiple sliding rods are arranged circumferentially, and their upper ends are connected to the receiving pocket structure, while their lower ends are connected to the limiting ring. There is a gap between adjacent sliding rods to accommodate the limiting claw, so that the filter cylinder and the inlet cylinder can form a sliding degree of freedom. The limiting claw limits the limiting ring to prevent the limiting ring from going upward over the limiting claw.

[0007] In one possible implementation, combining the above technical solutions, the receiving pocket structure and the slide rod are integrated into one structure, and the receiving pocket structure is a filter screen structure recessed at the top of the filter cartridge.

[0008] In one possible implementation, in conjunction with the above technical solutions, the inner side of the filter cartridge is also provided with an inner lining mesh, which is connected to the slide rod and the receiving pocket structure.

[0009] In one possible implementation, based on the above technical solutions, the upper part of the water inlet cylinder is provided with multiple limiting claws, and there is a gap between adjacent limiting claws for accommodating the slide rod. Each limiting claw is provided with a guide slope at its lower part.

[0010] In one possible implementation, based on the above technical solutions, the float assembly includes a connecting bracket and at least one float, with the float connected to the filter cartridge via the connecting bracket.

[0011] In one possible implementation, based on the above technical solutions, the float assembly includes three floats located on the same plane and connected to the support. The outer ends of the three floats are used to abut against the side wall of the water inlet cylinder to form a limiting position.

[0012] In one possible implementation, based on the above technical solutions, there are two risers, each equipped with a siphon pipe and a valve. The upper parts of both risers are connected to the inlet cylinder, and the lower parts are used to connect to the sewage pipe network and the rainwater pipe network, respectively.

[0013] In one possible implementation, in conjunction with the above technical solutions, the rainwater downpipe system also includes a water level sensor, a controller, and a power supply. The water level sensor is located at the bottom of the inlet cylinder, the valve is an electrically controlled valve, and the controller is connected to the valve, the water level sensor, and the power supply respectively. It is used to control the opening and closing of the valves on the two downpipes based on the signal transmitted by the water level sensor, so as to automatically discharge rainwater into the sewage network or the rainwater network as needed.

[0014] To achieve the above objectives, the present invention further adopts the following technical solution: providing an intelligent diversion method, applying the above-mentioned rainwater downpipe system, comprising the following steps:

[0015] Obtain water level information in the inlet tank, and estimate the estimated rainfall based on the changes in water level information over time;

[0016] When the estimated rainfall is less than the first threshold, indicating that it is currently in the early stage of rainfall, open the valve on the riser connected to the sewage network and close the valve on the riser connected to the stormwater network to allow rainwater containing silt and impurities in the early stage of rainfall to enter the sewage network, preventing the relatively dirty water in the early stage of rainfall from flowing into the stormwater network. When the estimated rainfall is more than the first threshold but less than the second threshold, close the valve on the riser connected to the sewage network and open the valve on the riser connected to the stormwater network to allow the relatively clean rainwater to enter the stormwater network and prevent it from entering the sewage network. When the estimated rainfall is more than the second threshold, open both the valves on the riser connected to the stormwater network and the valves on the riser connected to the sewage network to drain water quickly.

[0017] The beneficial effects of the rainwater downpipe system provided by this invention are as follows: Compared with the prior art, this invention, through the cooperation of the inlet cylinder, downpipe, siphon pipe, filter cylinder and float ball assembly, enables the filter cylinder to move up and down during the drainage process, so that large debris carried by rainwater can be slowly collected into the receiving pocket structure, instead of sticking to the side wall of the filter cylinder, thus not having too much impact on normal drainage, so that the rainwater can be slowly drained away in the end, and the entire drainage process does not require manual intervention, which saves manpower and is safe and reliable.

[0018] The beneficial effects of the intelligent diversion method provided by this invention are as follows: Compared with the prior art, this invention can discharge rainwater containing mud and sand impurities after washing the roof or ground into the sewage pipe network in the early stage of rainfall, and discharge relatively pure rainwater into the rainwater pipe network in the later stage, thereby reducing the difficulty of purifying rainwater in the later stage; moreover, when the rainfall is relatively heavy, the risers of both the rainwater pipe network and the sewage pipe network can be opened to drain water quickly and avoid excessive water accumulation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a rainwater downpipe system provided in one embodiment of the present invention;

[0021] Figure 2 This is a vertical sectional view of a rainwater downpipe system provided in one embodiment of the present invention.

[0022] Figure 3 A comparative schematic diagram of the usage status of a rainwater downpipe system provided in another embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a rainwater downpipe system provided in another embodiment of the present invention;

[0024] Figure 5 This is a vertical sectional view of a rainwater downpipe system provided in another embodiment of the present invention.

[0025] The labels for the attached figures are as follows:

[0026] 10. Water inlet cylinder; 11. Limiting claw;

[0027] 20. Riser; 21. Valve;

[0028] 30. Siphon tube;

[0029] 40. Filter cartridge; 41. Receiving pocket structure; 42. Limiting ring; 43. Slide rod;

[0030] 50. Float assembly; 51. Connecting bracket; 52. Float;

[0031] 61. Water level sensor; 62. Controller; 63. Power supply; 64. Communication module;

[0032] 71. Rainwater drainage network; 72. Sewage drainage network; 73. Roof;

[0033] 81. Rainwater; 82. Miscellaneous items. Detailed Implementation

[0034] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0036] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0037] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0039] The rainwater downpipe system and intelligent diversion method provided by this invention will now be described.

[0040] like Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a rainwater downpipe system, including an inlet cylinder 10, a downpipe 20, a siphon pipe 30, a filter cylinder 40, and a float assembly 50. The inlet cylinder 10 is vertically or obliquely buried on the working surface such as the roof or terrace floor, and its lower end is closed, with an inlet at the upper end and a drain outlet in the middle. The upper end of the downpipe 20 is connected to the drain outlet of the inlet cylinder 10 for drainage. The siphon pipe 30 spans the drain outlet, and its two ends are located at the bottom of the drain outlet and inside the downpipe 20, respectively. The filter cylinder 40 is slidably disposed inside the inlet cylinder 10, and its top is provided with a debris-receiving pocket structure 41, which closes the top of the filter cylinder 40. The float assembly 50 is disposed inside the inlet cylinder 10 and connected to the lower part of the filter cylinder 40, so that when the water level in the lower part of the inlet cylinder 10 rises, the upper part of the filter cylinder 40 protrudes out of the inlet, and when the water level in the lower part of the inlet cylinder 10 falls, the upper part of the filter cylinder 40 enters the inlet.

[0041] A specific usage process of the rainwater downpipe system provided by the present invention is as follows: Figure 3 As shown in the figure, the solid arrows indicate the direction of water flow.

[0042] When it is not raining, as shown in state (a) in the figure, debris 82 is scattered on the working surface, and since there is no rainwater in the water inlet cylinder 10, the filter cylinder 40 and the float assembly 50 are submerged in the water inlet cylinder 10.

[0043] Then, when it starts to rain, as shown in state (b) in the figure, rainwater gradually gathers in the inlet cylinder 10, and causes the filter cylinder 40 and the float assembly 50 to gradually rise. Under the influence of the water, the debris 82 enters the receiving pocket structure 41 or is blocked on the side wall of the filter cylinder 40.

[0044] Until, as shown in state (c) in the figure, the water level in the inlet cylinder 10 exceeds the top of the siphon tube 30, causing the siphon tube 30 to start drawing water;

[0045] Subsequently, as shown in state (d) in the figure, under the water absorption action of the siphon pipe 30, the water level of the rainwater in the inlet cylinder 10 gradually drops, causing the filter cylinder 40 and the float assembly 50 to gradually drop, and the debris 82 blocked on the side wall of the filter cylinder 40 is blocked by the working surface and moves relative to the filter cylinder 40.

[0046] Afterwards, as shown in state (e) in the figure, after the siphon tube 30 empties the water in the water inlet cylinder 10, the filter cylinder 40 and the float assembly 50 sink into the water inlet cylinder 10, and the siphon tube 30 also stops sucking water, while the debris 82 enters the receiving pocket structure 41 under the drive of the water flow.

[0047] Next, as shown in state (f) in the figure, as rainwater continues to be injected into the working surface, the water level in the inlet cylinder 10 begins to rise again. Since the side wall of the filter cylinder 40 is no longer blocked by the debris 82, the rainwater will quickly enter the inlet cylinder 10 and drain through the riser pipe 20 and siphon pipe 30.

[0048] Subsequently, if rainwater continues to bring debris that blocks the side wall of the filter cartridge 40, the water intake in the inlet cartridge 10 will decrease, and the process will repeat from state (c) to state (f), continuously gathering the debris in the receiving pocket structure 41. Finally, the debris can be removed when it has accumulated to a certain extent or when it is convenient for maintenance.

[0049] The above state sequence is only one typical usage process. In actual use, it may cycle through different states depending on the specific situation.

[0050] Compared with the prior art, the rainwater downpipe system provided in this embodiment, through the cooperation of the inlet cylinder 10, downpipe 20, siphon pipe 30, filter cylinder 40 and float assembly 50, allows the filter cylinder 40 to move up and down during drainage. This allows large debris carried by rainwater to be slowly collected into the receiving pocket structure 41 instead of adhering to the side wall of the filter cylinder 40, thus not having too much impact on normal drainage. This ensures that the rainwater is eventually drained away slowly, and the entire drainage process requires no manual intervention, saving manpower and ensuring safety and reliability.

[0051] like Figures 1 to 3 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0052] The inlet cylinder 10 is provided with a limiting claw 11. The filter cylinder 40 includes a receiving pocket structure 41, a limiting ring 42, and multiple sliding rods 43. The multiple sliding rods 43 are arranged circumferentially, and their upper ends are connected to the receiving pocket structure 41, and their lower ends are connected to the limiting ring 42. There is a gap between adjacent sliding rods 43 to accommodate the limiting claw 11, so that the filter cylinder 40 and the inlet cylinder 10 can form a sliding degree of freedom. The limiting claw 11 limits the limiting ring 42 to prevent the limiting ring 42 from going up over the limiting claw 11, so as to prevent the filter cylinder 40 from floating up and detaching from the inlet cylinder 10 when there is too much water in the inlet cylinder 10.

[0053] The receiving pocket structure 41 and the slide rod 43 are integrated into one structure, and the receiving pocket structure 41 is a filter screen structure recessed at the top of the filter cylinder 40 to receive debris and filter drainage.

[0054] The filter cartridge 40 is also provided with an inner lining mesh, which is connected to the slide bar 43 and the receiving pocket structure 41 to improve the filtration effect of the filter cartridge 40 and block more debris.

[0055] The upper part of the water inlet cylinder 10 is provided with multiple limiting claws 11, and there is a gap between adjacent limiting claws 11 for accommodating the slide rod 43. Each limiting claw 11 is provided with a guide slope at the bottom so that when the filter cylinder 40 rises, the slide rod 43 can smoothly enter the gap between adjacent limiting claws 11.

[0056] The float assembly 50 includes a connecting bracket 51 and at least one float 52, which is connected to the filter cartridge 40 via the connecting bracket 51.

[0057] The float assembly 50 includes three floats 52, which are located on the same plane and are connected to the bracket 51. The outer ends of the three floats 52 are used to abut against the side wall of the water inlet cylinder 10 to form a limit and prevent the float assembly 50 from swaying left and right, which would cause the filter cartridge 40 to get stuck when it rises and falls, thus ensuring the stability of the filter cartridge 40 when it rises and falls.

[0058] like Figure 4 and Figure 5As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0059] There are two risers 20, and each riser 20 is equipped with a siphon pipe 30 and a valve 21. The upper part of each riser 20 is connected to the inlet cylinder 10, and the lower part is used to connect to the sewage pipe network and the rainwater pipe network respectively, so that the received water can be discharged into the sewage pipe network or the rainwater pipe network as needed.

[0060] Furthermore, the rainwater downpipe system also includes a water level sensor 61, a controller 62, and a power supply 63. The water level sensor 61 is located at the bottom of the inlet cylinder 10, and the valve 21 is an electrically controlled valve. The controller 62 is connected to the valve 21, the water level sensor 61, and the power supply 63 respectively, and is used to control the opening and closing of the valve 21 on the two downpipes 20 according to the signal transmitted by the water level sensor 61, so as to automatically discharge rainwater into the sewage network or the rainwater network as needed.

[0061] Furthermore, the controller 62 is also equipped with a communication module 64, which is used to communicate with the data analysis platform to transmit data and obtain remote instructions.

[0062] Meanwhile, this invention provides an intelligent diversion method, applying the above-mentioned rainwater downpipe system, including the following steps:

[0063] The water level information in the inlet cylinder 10 is obtained, and the estimated rainfall is calculated based on the change of water level information over time.

[0064] When the estimated rainfall is less than the first threshold, it indicates that the rainfall is in its initial stage. Open valve 21 on the riser 20 connected to the sewage network and close valve 21 on the riser 20 connected to the rainwater network to allow rainwater containing sediment and impurities to enter the sewage network, preventing the relatively dirty water from flowing into the rainwater network. When the estimated rainfall is greater than the first threshold but less than the second threshold, close valve 21 on the riser 20 connected to the sewage network and open valve 21 on the riser 20 connected to the rainwater network to allow relatively clean rainwater to enter the rainwater network, preventing it from entering the sewage network. When the estimated rainfall is greater than the second threshold, indicating a relatively heavy rainfall, open both valve 21 on the riser 20 connected to the rainwater network and valve 21 on the riser 20 connected to the sewage network to quickly drain the water.

[0065] Compared with the prior art, the intelligent diversion method provided in this embodiment can discharge rainwater containing mud and sand impurities after washing the roof or ground into the sewage pipe network in the early stage of rainfall, and discharge the relatively pure rainwater into the rainwater pipe network in the later stage, thereby reducing the difficulty of purifying rainwater in the later stage; and when the rainfall is relatively heavy, the risers 20 of both the rainwater pipe network and the sewage pipe network can be opened to drain water quickly and avoid excessive water accumulation.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rainwater standpipe system characterized by, The utility model provides a filter device for water inlet cylinder, which comprises: a water inlet cylinder (10) vertically or obliquely buried in a working surface, with a closed lower end, a water inlet at the upper end, and a drain outlet in the middle; a vertical pipe (20) connected to the drain outlet of the water inlet cylinder (10) for draining water; a siphon pipe (30) spanning the drain outlet and having two ends respectively located at the bottom of the drain outlet and inside the vertical pipe (20); a filter cylinder (40) slidingly arranged in the water inlet cylinder (10) and having a top part provided with a sundry containing pocket structure (41) for enclosing the top part of the filter cylinder (40); a floating ball assembly (50) arranged in the water inlet cylinder (10) and connected to the lower part of the filter cylinder (40) to drive the upper part of the filter cylinder (40) to protrude out of the water inlet when the water level in the lower part of the water inlet cylinder (10) rises, and to drive the upper part of the filter cylinder (40) to enter the water inlet when the water level in the lower part of the water inlet cylinder (10) drops; the water inlet cylinder (10) is provided with a limiting claw (11), the filter cylinder (40) comprises the containing pocket structure (41), a limiting ring (42), and a plurality of sliding rods (43), the plurality of sliding rods (43) are circumferentially arranged, and the upper ends of the sliding rods (43) are connected to the containing pocket structure (41), and the lower ends of the sliding rods (43) are connected to the limiting ring (42); gaps for containing the limiting claw (11) are arranged between adjacent sliding rods (43) to form a sliding freedom degree between the filter cylinder (40) and the water inlet cylinder (10), and the limiting claw (11) limits the limiting ring (42) to prevent the limiting ring (42) from going up beyond the limiting claw (11).

2. The rainwater standpipe system of claim 1, wherein: The containing pocket structure (41) and the sliding rod (43) are an integral structure, and the containing pocket structure (41) is a filter screen structure recessed in the top part of the filter cylinder (40).

3. The rainwater standpipe system of claim 1, wherein: The inside of the filter cylinder (40) is further provided with an inner lining screen, and the inner lining screen is connected to the sliding rod (43) and the containing pocket structure (41).

4. The rainwater standpipe system of claim 1, wherein: The upper part of the water inlet cylinder (10) is provided with a plurality of limiting claws (11), and gaps for containing the sliding rods (43) are arranged between adjacent limiting claws (11), and each limiting claw (11) is provided with a guide inclined surface at the lower part.

5. The rainwater standpipe system of claim 1, wherein: The floating ball assembly (50) comprises a connecting bracket (51) and at least one floating ball (52), and the floating ball (52) is connected to the filter cylinder (40) through the connecting bracket (51).

6. The rainwater standpipe system of claim 5, wherein: The floating ball assembly (50) comprises three floating balls (52) located on the same plane and connected to the connecting bracket (51), and the outer ends of the three floating balls (52) are used for abutting against the side wall of the water inlet cylinder (10) to form a limit.

7. The rainwater standpipe system of claim 1, wherein: The vertical pipe (20) is two, and the two vertical pipes (20) are provided with the siphon pipe (30) and a valve (21), the upper parts of the two vertical pipes (20) are connected to the water inlet cylinder (10), and the lower parts are respectively connected to a sewage pipe network and a rainwater pipe network.

8. The rainwater standpipe system of claim 7, wherein: The rainwater vertical pipe system further comprises a water level sensor (61), a controller (62) and a power supply (63), the water level sensor (61) is arranged at the bottom of the water inlet cylinder (10), the valve (21) is an electrically controlled valve, the controller (62) is connected with the valve (21), the water level sensor (61) and the power supply (63) respectively, and is used for controlling the opening and closing of the valve (21) on the two vertical pipes (20) according to the signal transmitted by the water level sensor (61), so as to automatically discharge rainwater into the sewage pipe network or the rainwater pipe network according to the need.

9. A smart offloading method, characterized in that, The rainwater vertical pipe system according to claim 8 comprises the following steps: Obtaining water level information in the water inlet cylinder (10), and estimating the estimated rainfall according to the change of the water level information with time; When the estimated rainfall is less than the first threshold value, it is indicated that the current is in the early stage of rainfall, the valve (21) on the vertical pipe (20) connected with the sewage pipe network is opened, and the valve (21) on the vertical pipe (20) connected with the rainwater pipe network is closed, so that the rainwater with silt impurities in the early stage of rainfall enters the sewage pipe network, and the relatively dirty water in the early stage of rainfall is prevented from flowing into the rainwater pipe network; when the estimated rainfall is more than the first threshold value and less than the second threshold value, the valve (21) on the vertical pipe (20) connected with the sewage pipe network is closed, and the valve (21) on the vertical pipe (20) connected with the rainwater pipe network is opened, so that the relatively pure rainwater enters the rainwater pipe network and is prevented from entering the sewage pipe network; when the estimated rainfall is more than the second threshold value, the valve (21) on the vertical pipe (20) connected with the rainwater pipe network and the valve (21) on the vertical pipe (20) connected with the sewage pipe network are both opened, so as to rapidly discharge water.

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