Piston type variable-water-level rapid constant outflow device for rainwater storage pond

Abstract

The utility model discloses a piston type variable-water-level rapid constant outflow device for a rainwater storage pond. The piston type variable-water-level rapid constant outflow device comprises an overflow pipe, a water collecting pipe, a buoy, a sealing piece and a drainage pipe. The lower end of the overflow pipe is slidably inserted into the water collecting pipe, a sealing part is arranged at the joint, a buoy is arranged at the upper end of the overflow pipe, and the water collecting pipe is hermetically connected with the bottom surface of the rainwater storage pond and is also provided with a drainage pipe; a limiting device is further arranged to horizontally limit the overflow pipe, so that the overflow pipe vertically slides; according to the device, an overflow pipe and a water collecting pipe are combined to form a piston type outflow device, a buoy is arranged on the overflow pipe, the vertical position of the overflow pipe is adjusted through buoyancy of the buoy, constant outflow of different regulation and storage water levels of the rainwater regulation and storage pool is achieved, and a limiting device is adopted to improve the stability of the overflow pipe and restrain horizontal displacement of the overflow pipe. The device has the advantages of simple structure, small engineering quantity, low failure rate, energy conservation, carbon reduction, convenience in management and maintenance and the like, and has engineering application value.

Description

Technical Field

[0001] The utility model relates to the technical field of rainwater storage tanks, and particularly relates to a piston-type variable water level and rapid constant outflow device for rainwater storage tanks. Technical Background

[0002] Due to the "incompressibility" of water and the characteristic of "flowing from high to low", building a moderately sized storage tank in urban depressions to store peak flow is one of the very effective methods to solve urban waterlogging. It can effectively reduce the scale of downstream drainage facilities, and is widely used in the transformation of waterlogging points in built-up areas and the planning, design and construction of rainwater drainage systems in new urban areas, improving the drainage capacity of the region and reducing waterlogging disasters.

[0003] The storage tank can be designed as a reinforced concrete tank, or can be reasonably transformed by using natural water bodies such as rivers, ponds, artificial lakes, landscape ponds, etc. Since the storage tank generally occupies a large area, existing facilities or natural sites should be utilized as much as possible to build rainwater storage tanks, which can reduce construction costs and achieve good social benefits. In places where conditions permit, multi-functional storage tanks integrating rainwater purification, rainwater storage, wetland landscape, leisure and entertainment, etc. can be built in combination with sports fields, wetland parks, etc. according to topographical and geomorphic conditions. At this time, it is often necessary to control the water level at a suitable position on sunny days to ensure the landscape and amusement effects, and the water level can rise on rainy days to play a role in storing peak flow. After the rainfall decreases, it is then slowly discharged to downstream drainage facilities.

[0004] Currently, the following several methods are usually adopted to achieve the discharge of stored water bodies:

[0005] (1) Discharge through an overflow outlet. This method requires no power, has a simple structure and low cost, but cannot achieve uniform outflow, and has a greater impact on the downstream drainage facilities.

[0006] (2) Discharge through a stratified overflow outlet. This method achieves the goal of relatively balanced outflow through stratified overflow outlets. Compared with the first scheme, the outflow effect is better, but it is necessary to open and close the drainage ports layer by layer according to the water level, and the management workload is relatively large.

[0007] (3) Effluent discharge of the electric decanting device. The electric decanting device is a specialized device with a constant effluent flow at variable water levels, which can better achieve the goal of effluent control. It is usually composed of a decanting pipe, a drain pipe, a 360° rotating slewing support, a driving device, an automatic control device, etc. Compared with the two methods in (1) and (2), this method has obvious improvements. It can not only better control the effluent, but also achieve full automatic control, which is convenient for management. However, there are also some deficiencies, mainly including: 1) It requires electric drive, the device is relatively complex, and higher requirements are imposed on maintenance personnel in case of failures; 2) It requires a slewing support, which is a very important component determining the overall quality of the device; 3) It is commonly used for the effluent of SBR tanks. For the effluent of rainwater storage tanks, since the rising process of the water level in the storage water body is not very regular, it is difficult to scientifically determine its control logic, or it needs to be used in conjunction with a level gauge, and the system is relatively complex; 4) When multiple electric decanting devices work simultaneously, there are often certain deviations in their operating paces, and higher requirements are imposed on the overall commissioning.

[0008] (4) Effluent discharge of the self-floating decanting device. This method can better control the position of the decanting pipe relying on its own buoyancy (without electricity), thus better achieving the goal of effluent control for rainwater storage tanks. It is usually composed of a decanting pipe, a floating drum, a drain pipe, a 360° rotating slewing support, etc. Compared with (3), this method has more advantages in controlling the effluent of rainwater storage tanks, mainly manifested in the following points: 1) It does not require power, saving energy and reducing carbon emissions; 2) The control method is simple, and it can better adjust the position relying on its own buoyancy to achieve the goal of stable effluent; 3) The structure is relatively simple, the failure rate is relatively low, and it is convenient for management and maintenance; 4) When multiple units work simultaneously, their paces are naturally consistent, and no complex commissioning and calibration are required. However, there are also some deficiencies, mainly including: 1) It requires a 360° rotating slewing support, which is exactly the position prone to failures, and higher requirements are imposed on the quality of components; 2) The overall landscape effect is relatively poor, and due to its large size, the engineering quantity of overall enclosure and decoration is large; 3) Since there are certain differences in the water heads on the left and right overflow weirs of the decanting pipe at different rotating positions of the decanting device, there are certain differences in the effluent flow rates at different water levels.

[0009] Generally speaking, the two methods in (1) and (2) have simple structures and low costs, but it is difficult to meet the requirements of stable effluent for rainwater storage tanks; the two methods in (3) and (4) have relatively complex structures and high costs, but can achieve the goal of stable effluent for rainwater storage tanks; the fourth method is relatively more suitable for the effluent control of rainwater storage tanks, but still requires a high-quality slewing support.

[0010] In the field of sewage treatment, the Chinese utility model patent CN208327514U also discloses a self-floating water decanter, which includes a floating cylinder, a water decanting collector, a guide rod and a drain pipe. The floating cylinder is an annular sealed hollow floating cylinder. The water decanting collector is located below the floating cylinder and is connected to the floating cylinder. The guide rod is fixed in the sewage tank. The guide rod passes through the water decanting collector, and the water decanting collector can move freely up and down relative to the guide rod. The drain pipe is located below the water decanting collector. This water decanter can automatically lift and lower without external power, making the water decanter match the water level in the sewage tank. However, due to the limitation of the hose size, its discharge capacity and discharge speed far cannot meet the requirements of the rainwater storage tank, and it is impossible to achieve rapid and stable water outflow of the water body. Utility Model Content

[0011] To solve the above technical problems, the present utility model ingeniously designs a piston-type non-powered variable water level rapid constant outflow device for a rainwater storage tank by utilizing the buoyancy of the water body. Since this device does not require electric drive, nor does it adopt a slewing support, and can automatically achieve rapid and stable rainwater outflow by utilizing the buoyancy of the water body. Comparatively speaking, it is a more ideal constant outflow device for a rainwater storage tank.

[0012] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0013] A piston-type variable water level rapid constant outflow device for a rainwater storage tank, which includes an overflow pipe, a collecting pipe, a floating cylinder, a seal, a limiting device, and a drain pipe; the lower end of the overflow pipe is slidably inserted into the collecting pipe, a seal is provided at the connection between the overflow pipe and the collecting pipe, a floating cylinder is provided at the upper end of the overflow pipe, the collecting pipe is hermetically connected to the bottom surface of the rainwater storage tank, and a drain pipe communicating with the collecting pipe is also provided on the collecting pipe;

[0014] The floating cylinder drives the overflow pipe to perform piston-type variable water level movement in the collecting pipe under the buoyancy of the rainwater storage tank water body. The overflow pipe rises as the storage water level rises and drops as the storage water level drops, so that the overflow port of the overflow pipe remains unchanged from the storage water level of the storage tank, and further makes the overflow volume of the overflow pipe remain constant.

[0015] As a preferred solution of the present utility model, the elevation of the overflow port at the upper end of the overflow pipe is lower than the storage water level of the rainwater storage tank, preferably 0.02 - 0.20 m lower, and further preferably 0.05 - 0.10 m lower.

[0016] As a preferred solution of the present utility model, the seal adopts a corrugated inflatable rubber hose. The outer side of the rubber hose is bonded to the inner wall of the collecting pipe, and the inner side abuts against and seals the outer wall of the overflow pipe; the fitting degree between it and the overflow pipe is regulated by adjusting the air pressure in the rubber hose, and it should be appropriate to stop water, and should not be too large.

[0017] As a preferred embodiment of the present utility model, a limiting device is further included. The limiting device includes a limiting guide rail and a sliding support member. The lower end of the limiting guide rail is fixed to the bottom surface of the rainwater storage tank, and the upper end is fixed to the top surface of the rainwater storage tank. One end of the sliding support member is slidably sleeved on the limiting guide rail, and the other end is fixedly connected to the inner wall of the overflow pipe to horizontally limit the overflow pipe and enable the overflow pipe to slide in the vertical direction. The limiting guide rail is preferably located inside the water collecting pipe. Preferably, the sliding support member includes a sleeve and a plurality of support rods. The sleeve is slidably sleeved on the limiting guide rail, and a plurality of support rods are arranged on the sleeve and connected to the inner wall of the overflow pipe.

[0018] As a preferred embodiment of the present utility model, the minimum sleeved length of the overflow pipe and the water collecting pipe is not less than 0.1 - 0.2 m, preferably 0.1 - 0.15 m.

[0019] As a preferred embodiment of the present utility model, the diameter of the overflow pipe is 0.1 - 1.2 m, preferably 0.2 - 0.6 m.

[0020] As a preferred embodiment of the present utility model, both the overflow pipe and the water collecting pipe are made of stainless steel.

[0021] As a preferred embodiment of the present utility model, the bottom elevation of the overflow pipe is not lower than the bottom elevation of the drain pipe, preferably the axis elevation of the drain pipe.

[0022] As a preferred embodiment of the present utility model, the upper overflow opening of the overflow pipe is a flared opening, and the shape of the flared opening is preferably circular or rectangular.

[0023] As a preferred embodiment of the present utility model, a blind flange is provided at the bottom of the water collecting pipe, and the blind flange is fixed to the bottom plate of the rainwater storage tank by bolts.

[0024] Compared with the prior art, the main advantages of the present utility model are as follows:

[0025] (1) The present utility model combines a lifting overflow pipe with a fixed receiving water collecting pipe to form a piston-type outflow device. By arranging a float on the lifting overflow pipe and using the buoyancy of the float to adjust the vertical position of the overflow pipe, rapid and constant outflow at different storage levels of the rainwater storage tank is achieved. A limiting device is used to improve the stability of the lifting overflow pipe and restrict its horizontal displacement.

[0026] (2) Without any power, it can save energy and reduce carbon emissions, and can well control the constant outflow of the storage tank only by buoyancy; without the slewing bearing that needs to rotate 360°, the structure is simple, the failure rate is low, and the management and maintenance are convenient; the overflow pipe lifts vertically, with a compact size, small floor area, small engineering quantity of the overall enclosure structure (outflow well), and good landscape effect; according to different requirements, the overflow port can be designed into a circular shape or a rectangular shape, and a combined design can be adopted according to different overflow needs. The water heads at different positions of the overflow port are basically the same, and the discharged water flow is fast and constant, having good engineering application value. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of a rapid constant outflow device with a circular overflow port.

[0028] Figure 2 It is a plan schematic diagram of a rainwater storage tank with a circular overflow port.

[0029] Figure 3 It is a sectional schematic diagram of a rainwater storage tank with a circular overflow port.

[0030] Figure 4 It is a plan schematic diagram of a rainwater storage tank with a square overflow port.

[0031] In the figure: 1. Overflow pipe, 2. Collection pipe, 3. Bell mouth, 4. Float, 5. Limit guide rail, 6. Seal, 7. Drain pipe, 8. Fixed support, 9. Storage tank outlet pipe, 10. Inlet grille, 11. Storage tank top plate, 12. Galvanized steel grille cover plate, 13. Storage tank bottom plate, 14. Highest water level, 15. Lowest water level, 16. Flange, 17. Natural water body revetment. Specific Embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model.

[0033] Embodiment 1; See Figures 1-3 ;

[0034] A piston-type variable water level rapid constant outflow device for a rainwater storage tank in this embodiment is one of the preferred embodiments of the present utility model, including an overflow pipe 1, a collection pipe 2, a seal 6, a float 4, and a drain pipe 7; the collection pipe 2 is hermetically connected to the bottom surface of the rainwater storage tank, the lower end of the overflow pipe 1 is slidably sleeved inside the collection pipe 2, a seal 6 is provided at the connection between the overflow pipe 1 and the collection pipe 2, and a float 4 is provided at the upper end of the overflow pipe 1; a drain pipe 7 communicating with the collection pipe 2 is also provided on the collection pipe 2; the rapid constant outflow device in this embodiment adopts an independent design (a single overflow pipe 1 and a single collection pipe 2).

[0035] The buoy of the pontoon 4 drives the overflow pipe 1 to move in a piston-like manner with variable water levels in the water body of the rainwater storage tank. The overflow pipe 1 rises as the storage water level increases and drops as the storage water level decreases, so that the overflow port of the overflow pipe 1 remains at the same level as the storage water level of the storage tank, and thus the overflow flow rate of the overflow pipe 1 remains constant.

[0036] Specifically, the rapid and constant outflow device mainly consists of the following parts:

[0037] The pontoon 4 is used to ensure that the piston-type overflow pipe 1 is always in a suspended state within the water level adjustment range of the rainwater storage tank, and the water head above the upper overflow port of the overflow pipe 1 always remains constant, thereby realizing the constant outflow of the stored water volume. The pontoon 4 is circular in shape and can be flexibly made of stainless steel, plastic, rubber, etc. according to requirements and budgets. The inner diameter of the pontoon is larger than the size of the bell mouth 3. The size of the pontoon is mainly determined by the buoyancy of water and the gravity of the pontoon 4 and the overflow pipe 1. The weight of the water displaced by the part of the pontoon submerged in water is approximately equal to the sum of the gravity of the overflow pipe and the pontoon. During the lifting and lowering process of the overflow pipe 1, it can also overcome the influence of the frictional resistance of the seal 6 on the overflow pipe 1; specifically, the overflow pipe 1 is dominated by water buoyancy during the rising process, and the overflow pipe 1 is dominated by the gravity of the pontoon 4 and the overflow pipe 1 during the descending process.

[0038] The piston-type overflow pipe 1 is used for overflow drainage. It is made of stainless steel and can be connected to the pontoon 4 by means of welding, bolt connection, etc. The upper overflow port of the overflow pipe 1 is a circular bell mouth 3, and the elevation of the overflow port is lower than the storage water level of the rainwater storage tank, preferably 0.02 - 0.20 m lower, and more preferably 0.05 - 0.1 m lower. The water head difference between the overflow port and the storage water level can be adjusted according to the needs of rainwater discharge.

[0039] The collecting pipe 2 is used to receive and drain the water discharged from the piston-type overflow pipe 1. It is also made of stainless steel. A flange blind plate is provided at the bottom of the collecting pipe 2 for sealing and water stoppage. The flange blind plate is fixed to the bottom plate 13 of the rainwater storage tank by bolts (embedded bolts or expansion bolts). The drain pipe 7 provided on the collecting pipe 2 can be connected to the storage tank drain pipe 9 in the form of a flange 16 to realize the external discharge of the water body in the rainwater storage tank. The minimum socketing length between the overflow pipe 1 and the collecting pipe 2 is not less than 0.1 - 0.2 m, preferably 0.1 - 0.15 m. A seal 6 is provided at the socketing part inside the collecting pipe 2 and the overflow pipe 1 for water stoppage. The tightness between the seal 6 and the overflow pipe 1 is determined according to different storage water depths, ensuring both water stoppage and minimizing frictional resistance as much as possible; the length of the collecting pipe 2 is greater than the length of the overflow pipe 1. Specifically, the seal 6 can be a corrugated inflatable rubber hose. The outer side of the rubber hose is bonded to the inner wall of the collecting pipe, and the inner wave crest abuts against the outer wall of the overflow pipe 1 for sealing. The fitting degree between the rubber hose and the overflow pipe is adjusted by regulating the air pressure inside the rubber hose.

[0040] The drain pipe 7 and the storage tank drain pipe 9. The drain pipe 7 refers to the pipe provided on the collecting pipe 2 and communicating with the collecting pipe 2. The storage tank drain pipe 9 refers to the pipe that discharges the water body in the drain pipe 7 from the rainwater storage tank and is used for discharging the overflow water. It can be made of stainless steel pipe or carbon steel pipe, etc. When using a carbon steel pipe, measures such as using a rubber gasket for isolation are adopted when the storage tank drain pipe 9 is flange-connected to the drain pipe 7 (made of stainless steel) to prevent electrochemical corrosion. The storage tank drain pipe 9 discharges the regulated water flow after passing through the natural water body revetment 17. The diameter of the storage tank drain pipe 9 is preferably greater than or equal to the diameter of the overflow pipe 1. The bottom elevation of the overflow pipe is not lower than the bottom elevation of the drain pipe (referring to the water inlet, that is, the connection with the collecting pipe 2), preferably the axis elevation of the drain pipe, and preferably not lower than the top elevation of the drain pipe.

[0041] As an improvement of this embodiment, the rapid and constant outflow device may further include a limiting device, including a limiting guide rail 5 and a sliding support member (not shown in the figure), which is used for the horizontal limitation of the lifting type overflow pipe 1, so that the overflow pipe 1 can only move up and down along the limiting guide rail 5 and is made of stainless steel. When the limiting device is located in the collecting pipe 2 and a blind flange is provided at the bottom of the collecting pipe 2 (the blind flange can be regarded as the bottom surface of the rainwater storage tank), a fixed support 8 is provided on the blind flange. The bottom of the limiting guide rail 5 is installed on the fixed support 8, and the top of the limiting guide rail 5 is fixed to the inspection cover plate of the rainwater storage tank by means of a gland. The inspection cover plate is fixed to the top plate 11 of the rainwater storage tank (the cover plate is a part of the top plate). The inspection cover plate is a galvanized steel grid cover plate 12. The top of the limiting guide rail 5 is directly fixed to the inspection cover plate for easy maintenance and replacement. One end of the sliding support member is slidably arranged on the limiting guide rail 5, and the other end is fixedly connected to the inner wall of the overflow pipe 1; specifically, the sliding support member includes a sleeve and several support rods. The sleeve is slidably sleeved on the limiting guide rail, and several support rods are arranged on the sleeve and welded to the inner wall of the overflow pipe. The support rods can be perpendicular to the inner wall of the overflow pipe. The limiting guide rail 5 is preferably located on the inner axis of the collecting pipe 2. In other embodiments, at least three limiting devices can also be evenly arranged around the collecting pipe to horizontally limit the overflow pipe 1. The setting of the limiting device can make the overflow pipe have better stability.

[0042] The utility model combines a lifting overflow pipe 1 with a fixed receiving water collecting pipe 2 to form a piston-type outflow device. By arranging a float 4 on the lifting overflow pipe 1, the buoyancy of the float 4 is used to realize the rapid and constant outflow of different regulating water levels of the rainwater storage tank, and the limit guide rail 5 is used to improve the stability of the lifting overflow pipe 1. In the utility model, the lifting and lowering of the overflow pipe 1 is mainly affected by the buoyancy of water, the friction resistance of the seal to the overflow pipe 1, and the gravity of the float 4 and the overflow pipe 1. When the regulating water level rises, the buoyancy increases, the overflow pipe 1 is lifted, and the overflow pipe 1 and the float 4 are maintained in a force balance state. On the contrary, when the regulating water level drops, the buoyancy decreases, the overflow pipe 1 drops under the action of gravity, and the overflow pipe 1 moves down, so that the overflow pipe 1 and the float 4 restore the force balance. Since the regulating water level changes relatively slowly, the up and down movement of the overflow pipe 1 can be regarded as keeping synchronization with the lifting and lowering of the regulating water level, that is, the overflow port and the regulating water level maintain a constant water head.

[0043] When the device is used in practice, it can be installed in the outflow well of a river, pond, artificial lake, landscape pool, etc., and a water inlet is installed on the side wall of the outflow well. The water inlet is provided with a water inlet grid 10 to intercept the grid residue to prevent the overflow from being blocked. The water inlet should be located below the normal water level, and its upper edge should be located at least 0.1m below the normal water level, and the lower edge should be at least 0.3m away from the bottom of the storage tank.

[0044] In a specific embodiment, the designed internal clearance length of the outflow well of the rainwater storage tank is 3.4m, the width is 2.4m, and the height is 4.0m. The storage water level is about 2.1-3.3m relative to the bottom of the storage tank. The designed inner diameter of the water collecting pipe is 0.405m and the length is 2.0m. The outer diameter of the overflow pipe is 0.4m and the length is 1.5m. The minimum sleeve length is about 0.15m. The outer diameter of the drainage pipe is 0.4m, the maximum diameter of the bell mouth is 0.8m, and the expected discharge capacity is 206-547m 3 / h.

[0045] Example 2: Figure 1 , 3 , 4;

[0046] The present embodiment is one of the preferred embodiments of the present utility model. The fast and constant outflow device adopts a combined design, that is, a plurality of water collecting pipes 2 are designed in parallel, and an overflow pipe 1 is slidably sleeved on the upper end of each water collecting pipe 2. The overflow port at the upper end of each overflow pipe 1 is designed as a rectangular bell mouth 3, and the rectangular bell mouths 3 are arranged side by side. The axial spacing of the water collecting pipes 2 matches the length of the rectangular bell mouths 3. The buoys 4 are hollow cylindrical, and a buoy 4 is provided on each side of the long side of the rectangular bell mouth 3. The drain pipes 7 on each water collecting pipe 2 are connected through a total regulating tank drain pipe 9. The combined design is suitable for rainwater regulating tanks with large water discharge and faster water discharge speed requirements.

[0047] In a specific embodiment, the internal clear length of the outlet well of the rainwater storage tank is designed to be 5.0 m, the width is 3.9 m, and the height is 4.0 m. The storage water level is 2.1 - 3.3 m relative to the bottom of the storage tank. The designed inner diameter of the collecting pipe is 0.405 m and the length is 2.0 m. The outer diameter of the overflow pipe is 0.4 m and the length is 1.5 m. The minimum socket length is about 0.25 m. The outer diameter of the drain pipe is 0.4 m. The maximum size of the rectangular flared opening is 1.3 m × 0.8 m. A combined design of three collecting pipes 2 and three overflow pipes 1 is adopted, and the estimated total discharge is 213 - 566 m 3 / h.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A piston-type variable water level rapid constant outflow device for a rainwater storage tank, characterized in that: Including overflow pipe, water collecting pipe, float, seal, drain pipe; The lower end of the overflow pipe is slidably inserted in the water collecting pipe, a seal is provided at the connection between the overflow pipe and the water collecting pipe, a float is provided at the upper end of the overflow pipe, the water collecting pipe is sealed and connected to the bottom surface of the rainwater storage tank, and a drainage pipe is also provided on the water collecting pipe to communicate with the water collecting pipe.

2. The device according to claim 1, characterized in that: The overflow port at the upper end of the overflow pipe is at a lower elevation than the regulating water level of the rainwater regulating tank.

3. The device according to claim 2, characterized in that: The elevation of the overflow port at the upper end of the overflow pipe is 0.02-0.20m lower than the storage water level of the rainwater storage tank.

4. The device according to claim 2, characterized in that: The sealing element adopts a corrugated inflatable rubber hose, the outer side of the rubber hose is bonded to the inner wall of the water collecting pipe, and the inner side is abutted and sealed with the outer wall of the overflow pipe.

5. The device according to any one of claims 1 to 4, characterized in that: It also includes a limiting device, which includes a limiting guide rail and a sliding support. The lower end of the limiting guide rail is fixed to the bottom surface of the rainwater storage tank, and the upper end is fixed to the top surface of the rainwater storage tank. One end of the sliding support is slidably mounted on the limiting guide rail, and the other end is fixedly connected to the inner wall of the overflow pipe.

6. The device according to any one of claims 1 to 4, characterized in that: The minimum sleeve length between the overflow pipe and the water collecting pipe is not less than 0.1-0.2m.

7. The device according to any one of claims 1 to 4, characterized in that: The diameter of the overflow pipe is 0.1-1.2m.

8. The device according to any one of claims 1 to 4, characterized in that: The bottom elevation of the overflow pipe is not lower than the bottom elevation of the drainage pipe.

9. The device according to any one of claims 1 to 4, characterized in that: The overflow port at the upper end of the overflow pipe is a bell mouth.

10. The device according to any one of claims 1 to 4, characterized in that: A flange blind plate is provided at the bottom of the water collecting pipe, and the flange blind plate is fixed to the bottom plate of the rainwater regulating and storing tank by bolts.

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