Water-saving city rainwater storage device based on rainwater storage device of rainwater sewer

Abstract

The application relates to the technical field of rainwater collecting devices, and discloses a water-saving city rainwater storage device for rainwater in a sewer, which comprises a storage tank, a water inlet arranged at the top of the storage tank, a separation mechanism arranged at the side of the storage tank far from the water inlet, and a dosing mechanism arranged at the bottom of the separation mechanism; the separation mechanism is used for separating impurities in water, and the dosing mechanism is used for adding water quality purifying agents; the separation mechanism comprises a water pumping unit arranged at the side of the storage tank far from the water inlet, the water pumping unit being used for pumping rainwater in the storage tank, a vertical pipe arranged at the bottom of the water pumping unit, an upper shell arranged at the top of the vertical pipe, a sedimentation chamber arranged at the bottom of the upper shell, and a blowdown pipe arranged at the side of the sedimentation chamber close to the water inlet. Through the separation mechanism, suspended or deposited particulate matters, debris and other substances can be separated from water bodies, and agents can be added to the water bodies in the rainwater treatment process, so that dissolved or suspended pollutants are polymerized into precipitates which are easy to separate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rainwater collection devices, in particular to a rainwater storage device for sewer in rainy days in water-saving cities. BACKGROUND

[0002] The rainwater storage device for sewer is a comprehensive facility that realizes rainwater resource utilization and disaster prevention and control by optimizing the urban drainage system. Its core function is to balance urban water cycle and human activity demand. In heavy rain, the device quickly collects surface runoff through the pipeline network and temporarily stores it in the underground storage tank or modular container, effectively reducing the instantaneous drainage pressure, avoiding road waterlogging, waterlogging and damage to urban infrastructure caused by pipe network overload, and ensuring the safety of residents' life and property and the normal operation of the transportation system. The storage device dynamically adjusts the storage capacity through an intelligent monitoring system, gradually releases the stored rainwater to downstream water bodies or sewage treatment systems during the rainfall interval, and relieves the impact of the traditional drainage mode on natural water bodies.

[0003] The traditional rainwater storage device for sewer is widely used in the field of rainwater collection and treatment, but due to the limitations of its structure and working principle, there are some problems that cannot be ignored. For example, the traditional device lacks deep treatment capability for mixed rainwater. When the initial rainwater is formed by the rain runoff washing the ground pollutants, the device can only be stored by simple sedimentation or direct storage, and cannot integrate chemical neutralization and other deep purification processes, resulting in harmful substances in the accumulated rainwater entering the natural water body with discharge, aggravating pollution and ecological damage. At the same time, the device has low separation efficiency for solid impurities in sewage, causing leaves, plastic fragments, silt and other suspended and sedimentary materials to be retained in the storage space for a long time, which not only reduces the effective storage capacity and increases the cost of dredging and maintenance, but also may cause pipe blockage or equipment failure due to impurity accumulation. SUMMARY

[0004] In view of the problem of lack of deep purification and impurity separation of collected rainwater in the prior art, a rainwater storage device for sewer in rainy days in water-saving cities is proposed.

[0005] The purpose is to separate the solid impurities in the collected rainwater and purify the sewage by adding chemical agents.

[0006] The technical scheme of the present application is a rainwater storage device for sewer in rainy days in water-saving cities, which comprises a storage tank, a water inlet arranged at the top of the storage tank, a separation mechanism arranged on the side of the storage tank away from the water inlet, and a dosing mechanism arranged at the bottom of the separation mechanism.

[0007] The separation mechanism is used to separate the impurities in the water, and the dosing mechanism is used to add water quality purification agents.

[0008] The separation mechanism comprises a water pumping unit arranged on the side of the storage tank away from the water inlet, the water pumping unit being used for pumping the rainwater in the storage tank, a vertical pipe arranged at the bottom of the water pumping unit, an upper shell arranged at the top of the vertical pipe, a sedimentation chamber arranged at the bottom of the upper shell, a sewage pipe arranged on the side of the sedimentation chamber close to the water inlet, a bottom shell arranged at the bottom of the sedimentation chamber, an inner shell arranged in the middle of the vertical pipe, a blocking ring arranged at the bottom of the inner shell, a flow dividing ring arranged at the bottom of the vertical pipe, a water suction pipe arranged at the front of the bottom shell, and a secondary separation unit arranged in the vertical pipe and used for separating impurities again.

[0009] Further, the cross section of the sedimentation chamber is elliptical, and the bottom is higher than the height of the bottom shell.

[0010] Further, the water pumping unit comprises a water pump arranged on the side of the storage tank away from the water inlet, and a connecting pipe arranged on the side of the water pump away from the water outlet, the bottom of the connecting pipe being fixedly connected with the top of the vertical pipe.

[0011] Further, the secondary separation unit comprises a flow guide plate arranged in the vertical pipe, two square holes symmetrically arranged at the front and rear of the vertical pipe, and a vortex ring arranged at the bottom of the inner shell.

[0012] Further, the flow guide plate is spiral-shaped, and the width of the bottom is smaller than that of the top.

[0013] Further, the dosing mechanism comprises a through hole arranged at the bottom of the bottom shell, two expansion holes symmetrically arranged at the two sides of the through hole, a rotating shaft arranged in the through hole, an impeller arranged at the top of the rotating shaft, a spring sleeved on the middle part of the rotating shaft, a horizontal plate arranged at the bottom of the spring, the top and bottom of the spring being fixedly connected with the bottom shell and the horizontal plate respectively, a limiting hole arranged at the top of the horizontal plate, two cylinders symmetrically arranged at the two sides of the horizontal plate, a deep groove arranged at the bottom of the cylinder, two discharge holes symmetrically arranged at the front and rear of the deep hole, a cover arranged at the bottom of the bottom shell, and a medicine supply tank arranged at the bottom of the cover.

[0014] Further, the bottom of the rotating shaft is provided with a rotating wheel, the impeller and the rotating wheel are similar in shape, and the blade pressure surface directions of the impeller and the rotating wheel are opposite.

[0015] Further, the diameter of the cylinder matches the diameter of the expansion hole, and the top width of the discharge hole is greater than the bottom width.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. Through the separation mechanism set, the rainwater storage device can treat the solid impurities mixed in the rainwater during the collection of rainwater, strip the suspended or deposited particulate matter, debris and other substances from the water body, and prolong the service life of the facility. The separated rainwater impurity content is reduced, the cleanliness of the subsequent storage water body is improved, the basic conditions for rainwater resource utilization are provided, and the spread of pollutants with rainwater discharge to natural water bodies is avoided, reducing the environmental load.

[0018] 2. Through the setting of the dosing mechanism, the rainwater storage device can add reagents to the water body during rainwater treatment, promote the polymerization of dissolved or suspended pollutants into precipitates that are easy to separate, this process can reduce the turbidity and pollutant concentration of rainwater, improve the water quality stability of the storage water body, create basic conditions for subsequent reuse or safe discharge, and can adjust the amount of reagent according to the rainwater flow rate. The introduction of the dosing mechanism expands the pollution control dimension of the rainwater storage device, so that it can not only deal with physical impurities, but also treat chemical and biological pollutants, and enhance the comprehensive purification ability of complex urban runoff.

[0019] 3. Through the setting of the secondary separation unit, the rainwater storage device can further strengthen the impurity separation effect on the basis of preliminary treatment, and the separated impurities are discharged through the directional channel, reducing their residence in the storage unit and preventing clogging or water quality deterioration caused by long-term deposition. The secondary separation process enhances the removal ability of suspended solids, light floating matter and dissolved pollutants, improves the rainwater purification efficiency, and ensures that the storage water body meets higher standard reuse requirements. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall three-dimensional structure of the present application;

[0021] Figure 2 is a schematic diagram of the internal structure of the storage tank of the present application;

[0022] Figure 3 is a schematic diagram of the connection between the upper shell and the deposition chamber of the present application;

[0023] Figure 4 is a schematic diagram of the overall structure of the separation mechanism of the present application;

[0024] Figure 5 is a schematic diagram of the explosion structure of the separation mechanism of the present application;

[0025] Figure 6 is a schematic diagram of the vortex ring structure of the present application;

[0026] Figure 7 is a schematic diagram of the inner shell structure of the present application;

[0027] Figure 8 is a schematic diagram of the structure of the bottom shell and the deposition chamber of the present application;

[0028] Figure 9 Connection diagram of the cover and the bottom shell of the application;

[0029] Figure 10 Overall structure diagram of the dosing mechanism of the application;

[0030] Figure 11 Structure diagram of the cylinder and the impeller of the application.

[0031] In the figure:

[0032] 1, storage tank; 2, water inlet; 3, separation mechanism; 4, dosing mechanism; 31, vertical pipe; 32, upper shell; 33, sedimentation chamber; 34, sewage pipe; 35, bottom shell; 36, inner shell; 37, baffle ring; 38, flow dividing ring; 39, water suction pipe; 310, water pump; 311, connecting pipe; 312, flow guide plate; 313, square hole; 314, vortex ring; 41, through hole; 42, telescopic hole; 43, rotating shaft; 44, impeller; 45, spring; 46, cross plate; 47, limiting hole; 48, cylinder; 49, deep groove; 410, discharge hole; 411, cover; 412, medicine supply tank. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0034] Example 1, refer to Figures 1-11 , the first embodiment of the application provides a water-saving city rainwater storage device for rainwater in sewer, including storage tank 1, fixedly connected to the top of the water inlet 2 of the storage tank 1, further comprising a separation mechanism 3 installed on the side of the storage tank 1 away from the water inlet 2, and a dosing mechanism 4 installed at the bottom of the separation mechanism 3; the separation mechanism 3 is used for separating impurities in water, and the dosing mechanism 4 is used for putting water quality purification reagent; the separation mechanism 3 comprises a water pumping unit assembled on the side of the storage tank 1 away from the water inlet 2, the water pumping unit is used for pumping rainwater in the storage tank 1, a vertical pipe 31 fixedly connected to the bottom of the water pumping unit, an upper shell 32 fixedly connected to the top of the vertical pipe 31, a sedimentation chamber 33 fixedly connected to the bottom of the upper shell 32, a sewage pipe 34 fixedly connected to the side of the sedimentation chamber 33 close to the water inlet 2, a bottom shell 35 fixedly connected to the bottom of the sedimentation chamber 33, an inner shell 36 fixedly connected to the middle of the vertical pipe 31, a baffle ring 37 fixedly connected to the bottom of the inner shell 36, a flow dividing ring 38 fixedly connected to the bottom of the vertical pipe 31, a water suction pipe 39 fixedly connected to the front of the bottom shell 35, and a secondary separation unit assembled in the vertical pipe 31 for separating impurities again.

[0035] Specifically, the rainwater filtered initially flows into the inside of the storage tank 1 through the water inlet 2, the water pumping unit can pump the water in the storage tank 1, the vertical pipe 31 can form a channel for the water flow and provide support for other components, the upper shell 32 and the inner shell 36 can form a sandwich layer for the sewage after the secondary separation, the sedimentation chamber 33 can accommodate the impurities thrown to the inside by the centrifugal force and discharge the impurities outside the storage tank 1 through the sewage pipe 34, the bottom shell 35 can form a closed space together with the upper shell 32 and the sedimentation chamber 33 and accommodate the rainwater flowing in the inside, the inner shell 36 can separate the space in the separation mechanism 3 into different functional areas, the sewage after the secondary separation will be intercepted by the baffle 37 after entering the sedimentation chamber 33, avoiding the sewage entering the space on the top of the bottom shell 35, the flow dividing ring 38 can make the rainwater flowing upwards be divided, so that the rainwater below the vertical pipe 31 enters the inside of the vertical pipe 31, and the water suction pipe 39 can pump the rainwater in the storage tank 1 into the inside of the separation mechanism 3, and the water suction pipe 39 is connected to the inside of the bottom shell 35 through the angle of the bevel, so that the water flow entering the inner shell 36 generates a cyclone. Through the separation mechanism 3, the rainwater storage device can treat the solid impurities mixed in the rainwater during the collection of the rainwater, separate the suspended or deposited particles and other substances from the water body, and prolong the service life of the facility. The separated rainwater has a reduced impurity content, improves the cleanliness of the subsequent stored water body, provides a basic condition for the rainwater resource utilization, avoids the diffusion of pollutants with the rainwater discharge to the natural water body, and reduces the environmental load.

[0036] With reference to Figures 4-8 , the cross section of the sedimentation chamber 33 is oval, and the bottom is higher than the height of the bottom shell 35.

[0037] Specifically, the sedimentation chamber 33 can accommodate the impurities thrown to the inside by the centrifugal force, the impurities are deposited on the bottom of the sedimentation chamber 33, and the deposited impurities are discharged through the sewage pipe 34.

[0038] With reference to Figure 2 , the water pumping unit includes a water pump 310 fixedly connected to the side of the storage tank 1 away from the water inlet 2, and a connecting pipe 311 fixedly connected to the side of the water pump 310 away from the water outlet, and the bottom of the connecting pipe 311 is fixedly connected to the top of the vertical pipe 31.

[0039] Specifically, after the water pump 310 is started, the water pump 310 pumps water through the connecting pipe 311, so that a negative pressure is formed in the inside of the upper shell 32 and the bottom shell 35, and the rainwater in the inside of the storage tank 1 enters the inside of the bottom shell 35 under the action of the pressure difference.

[0040] With reference to Figures 4-8 , the secondary separation unit includes a flow guide plate 312 fixedly connected to the inside of the vertical pipe 31, two square holes 313 symmetrically arranged on the front and rear of the vertical pipe 31, and a vortex ring 314 fixedly connected to the bottom of the inner shell 36.

[0041] Specifically, the guide plate 312 can guide the upward-flowing water in a spiral shape, thereby generating centrifugal force. This centrifugal force causes impurities carried in the water to move along the inner wall of the vertical pipe 31, allowing them to enter the interlayer formed by the upper shell 32 and the inner shell 36 through the square hole 313. After passing through the vortex ring 314, they enter the sedimentation chamber 33. The cross-sectional shape of the vortex ring 314 is similar to that of a Tesla valve. When the fluid flows downwards, it experiences less resistance; when the liquid flows upwards, it forms a stronger vortex, reducing resistance. The flow of liquid is stopped, thus ensuring that rainwater entering the interlayer through the square hole 313 can smoothly enter the sedimentation chamber 33. Through the set secondary separation unit, the rainwater storage device can further enhance the impurity separation effect on the basis of the preliminary treatment. The separated impurities are discharged from the system through the directional channel, reducing their retention in the water storage unit and preventing siltation or water quality deterioration caused by long-term deposition. The secondary separation process enhances the removal capacity of suspended solids, light floating matter and dissolved pollutants, improves rainwater purification efficiency, and ensures that the stored water meets the higher standard of reuse requirements.

[0042] Reference Figure 7 The guide vane 312 has a spiral shape, and the width at the bottom is smaller than that at the top.

[0043] Specifically, the top diameter of the guide plate 312 is larger than that of the bottom, which narrows the channel through which the water flows upward. According to the Venturi effect, the narrowing of the channel leads to an increase in flow velocity, allowing impurities to be thrown towards the square hole 313.

[0044] Example 2, refer to Figures 8-11 This is the second embodiment of the present invention, which differs from the first embodiment in that: the drug delivery mechanism 4 includes a through hole 41 opened at the bottom of the bottom shell 35, two telescopic holes 42 symmetrically opened on both sides of the through hole 41, a rotating shaft 43 rotatably connected to the inside of the through hole 41, an impeller 44 fixedly connected to the top of the rotating shaft 43, a spring 45 sleeved in the middle of the rotating shaft 43, a horizontal plate 46 rotatably connected to the bottom of the spring 45, the top and bottom of the spring 45 being fixedly connected to the bottom shell 35 and the horizontal plate 46 respectively, a limiting hole 47 opened at the top of the horizontal plate 46, two cylinders 48 symmetrically fixedly connected to both sides of the horizontal plate 46, a deep groove 49 opened at the bottom of the cylinders 48, two discharge holes 410 symmetrically opened at the front and rear of the deep holes, a cover 411 fixedly connected to the bottom of the bottom shell 35, and a drug supply tank 412 fixedly connected to the bottom of the cover 411.

[0045] Specifically, the through hole 41 can constrain the motion freedom of the rotating shaft 43, allowing it to rotate only around its own axis. The telescopic hole 42 can restrict the position of the cylinder 48. The rotating shaft 43 can transmit power, causing the impeller 44 and the rotor to rotate synchronously. The impeller 44 at the top of the rotating shaft 43 will rotate after being pushed by the water flow. While rotating, it moves upward, and the faster the rotation speed, the greater the upward force. The rotor at the bottom can agitate the medicine in the casing 411, allowing the medicine to enter the bottom shell 35 through the discharge hole 410. The movement of the impeller 44 drives the rotating shaft 43 to move together. The horizontal plate 46 can move with the rotating shaft 43 and transmit the force to the two cylinders 48 while moving. The spring 45 can push the impeller 44 when it is not rotating. The horizontal plate 46 is reset, and the water purification agent can flow out through the part of the discharge hole 410 that is higher than the expansion hole 42. It is mixed with the water flow under the stirring of the fan blades. The medicine tank 412 can store the agent and transport the agent to the inside of the cover 411. Through the set dosing mechanism 4, the rainwater storage device can add the agent to the water body during the rainwater treatment process, which promotes the aggregation of dissolved or suspended pollutants into easily separated precipitates. This process can reduce the turbidity and pollutant concentration of rainwater, improve the water quality stability of the stored water body, create basic conditions for subsequent reuse or safe discharge, and can adjust the dosage according to the rainwater flow rate. The introduction of the dosing mechanism 4 expands the pollution control dimension of the rainwater storage device, enabling it to not only deal with physical impurities, but also treat chemical and biological pollutants, and enhance the comprehensive purification capacity for complex urban runoff.

[0046] Reference Figure 10 and Figure 11 The bottom of the rotating shaft 43 is provided with a rotating wheel, and the impeller 44 and the rotating wheel are similar in shape, and the blade pressure surfaces of the impeller 44 and the rotating wheel are opposite in direction.

[0047] Specifically, the impeller 44 at the top of the shaft 43 moves upward after being impacted by the flowing water. After the impeller 44 rotates, it pushes the medicine upward. Since the impeller 44 has a larger force-bearing surface, the force generated will be greater than that of the bottom impeller. Therefore, when the impeller and the impeller 44 rotate at the same time, the shaft 43 will move upward.

[0048] Reference Figure 10 and Figure 11 The diameter of the cylinder 48 matches the diameter of the telescopic hole 42, and the top width of the discharge hole 410 is greater than the bottom width.

[0049] Specifically, the cylinder 48 can only move up and down under the constraint of the telescopic hole 42. The larger the area of ​​the discharge hole 410 extending into the bottom shell 35, the more the medicine flowing out through the discharge hole 410 can be constrained. The rest of the structure is the same as that of Example 1.

[0050] Based on embodiments 1-2, the working principle of this invention is as follows: The device is buried underground, and the inlet 2 is connected to the sewer. After rainwater is collected and pretreated by the sewer, it enters the interior of the storage tank 1 through the inlet 2. When the water in the storage tank 1 is needed, the water is pumped out by the water pump 310. After the water pump 310 is started, a negative pressure state is formed inside the separation mechanism 3 through the connecting pipe 311. The water in the storage tank 1 will enter the interior of the bottom shell 35 through the suction pipe 39 under the action of the pressure difference. Since the suction pipe 39 is connected to the bottom shell 35 at an oblique angle, the water will flow along the inner wall of the bottom shell 35 after entering the bottom shell 35, and form a swirling flow under the guidance of the inner wall of the bottom shell 35. Due to the suction action of the water pump 310, the water will flow in a spiral pattern. The water flows upwards in a swirling motion. This swirling motion generates centrifugal force, causing solid impurities carried in the water to be thrown towards the inner wall. As the water rises, these impurities are thrown into the sedimentation chamber 33 and discharged from the storage tank 1 through the drain pipe 34. In this state, the closer to the center of the swirling motion, the fewer the impurities. The water flowing towards the center with fewer impurities rises into the vertical pipe 31 and is simultaneously diverted by the diverting ring 38. The water flowing relatively outwards from the center of the swirling motion, along with the impurities it carries, is guided towards the inner wall of the inner shell 36 and, guided by the inclined inner wall of the inner shell 36, enters the sedimentation chamber 33. After entering the vertical pipe 31, the water flows through the guide plate 312. During this process, the water is deflected and guided by the guide plate 312, forming another upward swirling motion. Because the diameter of the top of the guide plate 312 is larger than that of the bottom, the cross-section of the channel formed between the top of the guide plate 312 and the vertical pipe 31 becomes smaller. When the water flows through the smaller channel, the flow velocity increases, enhancing the centrifugal force of the water flow and performing secondary separation. Impurities moving against the inner wall of the vertical pipe 31 in the swirling state enter the interlayer formed by the upper shell 32 and the inner shell 36 through the square hole 313, and then enter the sedimentation chamber 33 after passing through the vortex ring. Under the action of the baffle ring 37, it is prevented from flowing into the bottom shell 35. The vortex ring 314 can prevent backflow, allowing the water to flow only from the top of the vortex ring 314 to the bottom. The medicine tank 412 can store water purification agents, and gravity allows the agents to fill the inside of the cover 411. When water is absorbed... After water enters pipe 39, the water flow will drive the impeller 44 at the top of the rotating shaft 43 to rotate. After the impeller 44 rotates, it drives the rotating shaft 43 to rise and rotate synchronously. The rotating shaft 43 drives the bottom wheel to rotate. After the wheel rotates, it drives the agent to flow upward. As the rotating shaft 43 moves upward, it also drives the horizontal plate 46 to move upward. The upward movement of the horizontal plate 46 compresses the spring 45 to store force. At the same time, the upward movement of the horizontal plate 46 will also drive the cylinder 48 connected to it to move upward. After the cylinder 48 moves upward, the discharge hole 410 will move above the telescopic hole 42. At this time, the agent flows into the deep tank 49 and flows into the bottom shell 35 through the discharge hole 410. Under the action of swirling flow, it mixes with the water flow drawn into the bottom shell 35 by the suction pipe 39, causing the impurities in the water flow to react and aggregate into solids or flocs.Subsequently separated by the separation mechanism 3, the faster the water flow rate into the bottom shell 35 through the suction pipe 39, the faster the impeller 44 at the top of the rotating shaft 43 rotates, and the greater the distance the rotating shaft 43 rises. At this point, the more the discharge hole 410 is positioned above the telescopic hole 42, the more medicine can flow out through the discharge hole 410; conversely, the less medicine flows out. When the water pump 310 stops, the suction pipe 39 stops supplying water, the impeller 44 stops rotating and no longer provides lift, and the horizontal plate 46 will descend and reset under the action of the spring 45, driving the cylinder 48 to reset, thus stopping the supply of medicine.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rainwater storage device for urban rainwater drainage systems based on water conservation, comprising a storage tank and an inlet located at the top of the storage tank, characterized in that: It also includes a separation mechanism located on the side of the storage tank away from the inlet, and a drug delivery mechanism located at the bottom of the separation mechanism; The separation mechanism is used to separate impurities from the water, and the dosing mechanism is used to add water purification agents. The separation mechanism includes a pumping unit located on the side of the storage tank away from the inlet, used to pump rainwater from inside the storage tank; a vertical pipe located at the bottom of the pumping unit; an upper shell located at the top of the vertical pipe; a sedimentation chamber located at the bottom of the upper shell; a drain pipe located on the side of the sedimentation chamber near the inlet; a bottom shell located at the bottom of the sedimentation chamber; an inner shell located in the middle of the vertical pipe; a baffle ring located at the bottom of the inner shell; a flow divider ring located at the bottom of the vertical pipe; and a suction pipe located at the front of the bottom shell. The suction pipe is connected to the bottom shell at an oblique angle. After the water flows into the bottom shell through the suction pipe, it forms a spiral upward vortex. The vortex throws the impurities it carries toward the inner wall of the inner shell through centrifugal force. The central water flow with fewer impurities rises into the vertical pipe and is diverted by the flow divider ring while entering the vertical pipe. The water flow and impurities carried by the center of the vortex are guided toward the inner wall of the inner shell and enter the sedimentation chamber under the guidance of the inclined inner wall of the inner shell. A secondary separation unit located at the junction of the inner shell and the upper shell is used to separate impurities again. The secondary separation unit includes a guide plate inside the vertical tube, two square holes symmetrically opened at the front and rear of the vertical tube, and a vortex ring between the bottom of the outer wall of the inner shell and the bottom cavity of the inner wall of the upper shell. Water flows into the vertical tube through the square holes and then enters the sedimentation chamber through the vortex ring. The flow channel cross-section of the vortex ring is Tesla valve-shaped to prevent water from flowing back upward through the vortex ring.

2. The rainwater storage device for urban rainwater drainage systems according to claim 1, characterized in that: The sedimentation chamber has an elliptical cross-section, and its bottom is higher than or lower than the bottom shell.

3. The rainwater storage device for urban rainwater drainage systems according to claim 1, characterized in that: The pumping unit includes a water pump located on the side of the storage tank away from the inlet, and a connecting pipe located on the side of the water pump away from the outlet. The bottom of the connecting pipe is fixedly connected to the top of the vertical pipe.

4. The rainwater storage device for urban rainwater drainage systems according to claim 1, characterized in that: The guide plate is spiral-shaped, and the width at the bottom is smaller than that at the top.

5. The rainwater storage device for urban rainwater drainage systems according to claim 1, characterized in that: The drug delivery mechanism includes a through hole at the bottom of the bottom shell, two telescopic holes symmetrically located on both sides of the through hole, a rotating shaft located inside the through hole, an impeller located at the top of the rotating shaft, a spring sleeved in the middle of the rotating shaft, a horizontal plate located at the bottom of the spring, the top and bottom of the spring being fixedly connected to the bottom shell and the horizontal plate respectively, a limiting hole located at the top of the horizontal plate, two cylinders symmetrically located on both sides of the horizontal plate, a deep groove located at the bottom of the cylinders, two discharge holes symmetrically located at the front and rear of the deep holes, a cover located at the bottom of the bottom shell, and a drug supply tank located at the bottom of the cover.

6. The rainwater storage device based on a water-saving urban rainwater drainage system according to claim 5, characterized in that: The bottom of the rotating shaft is provided with a rotating wheel. The impeller and the rotating wheel have similar shapes, and the blade pressure surfaces of the impeller and the rotating wheel are in opposite directions.

7. The rainwater storage device for urban rainwater drainage systems according to claim 5, characterized in that: The diameter of the cylinder matches the diameter of the telescopic hole, and the top width of the discharge hole is greater than the bottom width.

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