Water-saving type urban rainy day sewer rainwater storage device

Abstract

The invention relates to the technical field of rainwater collection devices, and discloses a water-saving type urban rainy day sewer rainwater storage device which comprises a storage tank, a water inlet formed in the top of the storage tank, a separation mechanism arranged on the side, away from the water inlet, of the storage tank, and a dosing mechanism arranged at the bottom of the separation mechanism. The separating mechanism is used for separating impurities in water, and the dosing mechanism is used for feeding a water quality purifying agent; the water pumping unit is arranged on the side, away from the water inlet, of the storage tank and used for pumping rainwater in the storage tank, the vertical pipe is arranged at the bottom of the water pumping unit, the upper shell is arranged on the top of the vertical pipe, the deposition chamber is arranged at the bottom of the shell, and the blow-off pipe is arranged on the side, close to the water inlet, of the deposition chamber. By arranging the separating mechanism, suspended or deposited particles, chippings and other substances can be separated from the water body, and chemicals can be added into the water body in the rainwater treatment process, so that dissolved or suspended pollutants are promoted to be polymerized into precipitates easy to separate.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater collection devices, and particularly to a rainwater storage device for sewers in a water-saving city on rainy days. Background Art

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

[0003] Traditional sewer rainwater storage devices are widely used in the field of rainwater collection and treatment. However, due to the limitations of their structures and working principles, there are often some problems that cannot be ignored. For example, traditional devices lack the ability to deeply treat mixed rainwater. When rainfall runoff scours ground pollutants to form initial rainwater, the device only performs simple precipitation or direct storage, and cannot integrate deep purification processes such as chemical neutralization, resulting in harmful substances in the stored rainwater entering natural water bodies with the discharge, exacerbating pollution and ecological damage. At the same time, the device has low separation efficiency for solid impurities in sewage, resulting in long-term retention of suspended substances and sediments such as leaves, plastic fragments, and sediment in the storage space, not only reducing the effective water storage capacity, increasing the cost of silt cleaning and maintenance, but also possibly causing pipeline blockage or equipment failure due to impurity accumulation. Summary of the Invention

[0004] In view of the problems in the prior art that there is a lack of deep purification and impurity separation of the collected rainwater, a rainwater storage device for sewers in a water-saving city on rainy days is proposed.

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

[0006] The technical solution of the present invention is a rainwater storage device for sewers in a water-saving city on rainy days, including 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 far from the water inlet, and a medicine feeding mechanism arranged at the bottom of the separation mechanism;

[0007] The separation mechanism is used to separate impurities in the water, and the medicine feeding mechanism is used to add water purification agents;

[0008] The separation mechanism includes a pumping unit arranged on the side of the storage tank away from the water inlet, which is used to pump the rainwater inside the storage tank, a vertical pipe arranged at the bottom of the pumping unit, an upper shell arranged at the top of the vertical pipe, a sedimentation chamber arranged at the bottom of the outer 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 retaining 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 inside the vertical pipe for separating impurities again.

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

[0010] Further, the pumping unit includes 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 is fixedly connected to the top of the vertical pipe.

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

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

[0013] Further, the drug delivery mechanism includes a through hole opened at the bottom of the bottom shell, two telescopic holes symmetrically opened on both sides of the through hole, a rotating shaft arranged inside the through hole, an impeller arranged at the top of the rotating shaft, a spring sleeved on the middle of the rotating shaft, a cross plate arranged at the bottom of the spring, the top and bottom of the spring are fixedly connected to the bottom shell and the cross plate respectively, a limit hole opened at the top of the cross plate, two cylinders symmetrically arranged on both sides of the cross plate, a deep groove opened at the bottom of the cylinder, two discharge holes symmetrically opened in the front and rear of the deep hole, a cover shell arranged at the bottom of the bottom shell, and a medicine supply tank arranged at the bottom of the cover shell.

[0014] Further, a runner is arranged at the bottom of the rotating shaft. The impeller and the runner are similar in shape, and the pressure surface directions of the blades of the impeller and the runner are opposite.

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

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

[0017] 1. Through the provided separation mechanism, during the process of collecting rainwater, the rainwater storage device can specifically treat the solid impurities mixed therein, stripping suspended or deposited particulate matters, debris and other substances from the water body, thereby extending the service life of the facility. The content of impurities in the separated rainwater is reduced, improving the cleanliness of the subsequent stored water body, providing a basic condition for the resource utilization of rainwater. At the same time, it prevents pollutants from being discharged and diffused into natural water bodies with rainwater, reducing the environmental load.

[0018] 2. Through the provided dosing mechanism, the rainwater storage device can add chemicals to the water body during the rainwater treatment process, promoting 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 stored water body, create a basic condition for subsequent reuse or safe discharge, and can adjust the dosing amount according to the rainwater flow rate. The introduction of the dosing mechanism expands the pollution control dimension of the rainwater storage device, enabling it to not only deal with physical impurities, but also handle chemical and biological pollutants, enhancing the comprehensive purification ability for complex urban runoff.

[0019] 3. Through the provided secondary separation unit, the rainwater storage device can further enhance the impurity separation effect on the basis of preliminary treatment. The separated impurities are discharged from the system through a directional channel, reducing their retention in the storage unit, preventing blockage or water quality deterioration caused by long-term deposition. The secondary separation process strengthens the removal ability of suspended matter, light floating matter and dissolved pollutants, improves the rainwater purification efficiency, and ensures that the stored water body meets the higher standard reuse requirements. Brief Description of the Drawings

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the whole of the present invention;

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

[0022] Figure 3 It is a connection schematic diagram of the upper shell and the sedimentation chamber of the present invention;

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

[0024] Figure 5 It is an exploded structure schematic diagram of the separation mechanism of the present invention;

[0025] Figure 6 It is a schematic diagram of the eddy current ring structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the internal shell structure of the present invention;

[0027] Figure 8 It is a schematic diagram of the bottom shell and the sedimentation chamber structure of the present invention;

[0028] Figure 9 Schematic diagram of the connection between the housing and the bottom case of the present invention;

[0029] Figure 10 Schematic diagram of the overall structure of the drug delivery mechanism of the present invention;

[0030] Figure 11 Schematic diagram of the structure of the cylinder and the impeller of the present invention.

[0031] In the figure:

[0032] 1. Storage tank; 2. Water inlet; 3. Separation mechanism; 4. Drug delivery mechanism; 31. Vertical pipe; 32. Upper shell; 33. Deposition chamber; 34. Sewage discharge pipe; 35. Bottom case; 36. Inner shell; 37. Retaining ring; 38. Shunt ring; 39. Water suction pipe; 310. Water pump; 311. Connecting pipe; 312. Deflector; 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. Housing; 412. Medicine supply tank. Specific embodiments

[0033] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0034] Example 1, referring to Figures 1 - 11 , which is the first embodiment of the present invention, provides a rainwater storage device for a water-saving city sewer in rainy days, including a storage tank 1, a water inlet 2 fixedly connected to the top of the storage tank 1, and further including a separation mechanism 3 installed on one side of the storage tank 1 away from the water inlet 2, and a drug delivery mechanism 4 installed at the bottom of the separation mechanism 3; the separation mechanism 3 is used to separate impurities in the water, and the drug delivery mechanism 4 is used to put water purification agents; the separation mechanism 3 includes a pumping unit assembled on one side of the storage tank 1 away from the water inlet 2, the pumping unit is used to pump rainwater inside the storage tank 1, a vertical pipe 31 fixedly connected to the bottom of the pumping unit, an upper shell 32 fixedly connected to the top of the vertical pipe 31, a deposition chamber 33 fixedly connected to the bottom of the outer shell, a sewage discharge pipe 34 fixedly connected to the deposition chamber 33 near the water inlet 2, a bottom case 35 fixedly connected to the bottom of the deposition chamber 33, an inner shell 36 fixedly connected to the middle of the vertical pipe 31, a retaining ring 37 fixedly connected to the bottom of the inner shell 36, a shunt 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 case 35, and a secondary separation unit assembled inside the vertical pipe 31 for separating impurities again.

[0035] Specifically, the preliminarily filtered rainwater flows into the interior of the storage tank 1 through the water inlet 2. The pumping unit can pump out the water in the storage tank 1. The vertical pipe 31 can form a channel for the water flow to pass through and provide support for other components. A sandwich layer for accommodating the sewage to flow through can be formed between the upper shell 32 and the inner shell 36. The sedimentation chamber 33 can accommodate the impurities thrown to the inside by the centrifugal force and discharge them outside the storage tank 1 through the sewage discharge 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 inside. By setting the inner shell 36, the space inside the separation mechanism 3 can be divided into different functional areas. The sewage after secondary separation will be intercepted by the retaining ring 37 after entering the sedimentation chamber 33 to prevent the sewage from entering the space at the top of the bottom shell 35. The flow diversion ring 38 can divert the upward flowing rainwater so that the rainwater directly below the vertical pipe 31 enters the interior of the vertical pipe 31. The water suction pipe 39 can pump the rainwater in the storage tank 1 into the interior of the separation mechanism 3, and the water suction pipe 39 is connected to the inside of the bottom shell 35 at an oblique cut angle to generate a swirl of the water flow entering the inner shell 36. By setting the separation mechanism 3, the rainwater storage device can specifically treat the solid impurities mixed in the rainwater during the rainwater collection process, strip the suspended or deposited particulate matter, debris and other substances from the water body, and extend the service life of the facility. The content of impurities in the separated rainwater is reduced, the cleanliness of the subsequent stored water body is improved, providing a basic condition for the resource utilization of rainwater. At the same time, it avoids the diffusion of pollutants to natural water bodies with the rainwater discharge, reducing the environmental load.

[0036] Refer 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 settle at the bottom of the sedimentation chamber 33, and the deposited impurities are discharged through the sewage discharge pipe 34.

[0038] Refer to Figure 2 , the 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. The bottom of the connecting pipe 311 is fixedly connected to the top of the vertical pipe 31.

[0039] Specifically, after starting the water pump 310, the water pump 310 will pump water through the connecting pipe 311 to form a negative pressure inside the upper shell 32 and the bottom shell 35. The rainwater inside the storage tank 1 will enter the inside of the bottom shell 35 through the water suction pipe 39 under the action of the pressure difference.

[0040] Refer to Figures 4 - 8 , the secondary separation unit includes a guide plate 312 fixedly connected inside the vertical pipe 31, two square holes 313 symmetrically opened in 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 flow guide plate 312 can make the upward flowing water flow in a spiral shape, thereby generating a centrifugal force. Under the action of the centrifugal force, the impurities carried in the water flow move along the position close to the inner wall of the vertical pipe 31, so that the impurities carried in the water flow enter the interlayer formed by the upper shell 32 and the inner shell 36 through the square hole 313, and enter the sedimentation chamber 33 after passing through the eddy current ring 314. The cross-sectional shape of the eddy current ring 314 is approximately that of a Tesla valve. When the fluid flows from top to bottom, the resistance is small. When the liquid flows from bottom to top, a strong eddy current will be formed to prevent the liquid from flowing, so as to ensure that the rainwater entering the interlayer through the square hole 313 can smoothly enter the interior of the sedimentation chamber 33. Through the set secondary separation unit, the rainwater storage device can further strengthen the impurity separation effect on the basis of preliminary treatment. The separated impurities are discharged from the system through the directional channel, reducing their retention in the storage unit and preventing blockage or water quality deterioration caused by long-term sedimentation. The secondary separation process strengthens the removal ability of suspended solids, light floating substances and dissolved pollutants, improves the rainwater purification efficiency, and ensures that the stored water body meets the higher standard reuse requirements.

[0042] Refer to Figure 7 , the outer shape of the flow guide plate 312 is spiral, and the width of the bottom is smaller than that of the top.

[0043] Specifically, the diameter of the top of the flow guide plate 312 is larger than that of the bottom, narrowing the channel for the water flow to move upward. According to the Venturi effect, the narrowing of the channel leads to an increase in the flow rate, enabling the impurities to be thrown towards the square hole 313.

[0044] Example 2, refer to Figures 8 - 11 , which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is 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 on the middle of the rotating shaft 43, a cross plate 46 rotatably connected to the bottom of the spring 45, the top and bottom of the spring 45 are fixedly connected to the bottom shell 35 and the cross plate 46 respectively, a limit hole 47 opened on the top of the cross plate 46, two cylinders 48 symmetrically and fixedly connected to both sides of the cross plate 46, a deep groove 49 opened at the bottom of the cylinder 48, two discharge holes 410 symmetrically opened at the front and rear of the deep hole, a cover shell 411 fixedly connected to the bottom of the bottom shell 35, and a medicine supply tank 412 fixedly connected to the bottom of the cover shell 411.

[0045] Specifically, the through-hole 41 can restrict the degrees of freedom of movement of the rotating shaft 43 so that it can only rotate around its own axis. The telescopic hole 42 can limit the position of the cylinder 48. The rotating shaft 43 can transmit power to make the impeller 44 and the runner 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 will move upward. Moreover, the faster the rotation speed, the greater the upward moving force. The runner at the bottom can agitate the medicament in the housing 411 so that the medicament enters the inner part of the bottom shell 35 through the discharge hole 410. While the impeller 44 moves, it drives the rotating shaft 43 to move together. The cross plate 46 can move together with the rotating shaft 43 and transmit the acting force to the two cylinders 48 while moving. The spring 45 can push the cross plate 46 to reset when the impeller 44 does not rotate. The water purification medicament can flow out through the part of the discharge hole 410 higher than the telescopic hole 42 and be mixed with the water flow under the agitation of the fan blades. The medicine supply tank 412 can store the medicament and transport the medicament to the inside of the housing 411. Through the provided medicine administration mechanism 4, the rainwater storage device can add medicament to the water body during the rainwater treatment process, prompting the dissolved or suspended pollutants to polymerize into precipitates that are easy to separate. This process can reduce the turbidity and pollutant concentration of the rainwater, improve the water quality stability of the stored water body, create basic conditions for subsequent reuse or safe discharge, and can adjust the medicament dosage according to the rainwater flow rate. The introduction of the medicine administration 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, enhancing the comprehensive purification ability for complex urban runoff.

[0046] Referring to Figure 10 and Figure 11 , a runner is provided at the bottom of the rotating shaft 43. The impeller 44 and the runner are similar in shape, and the pressure surface directions of the blades of the impeller 44 and the runner are opposite.

[0047] Specifically, the impeller 44 at the top of the rotating shaft 43 moves upward after being impacted by the flowing water. After the impeller 44 rotates, it pushes the liquid medicine to flow upward. Since the force-bearing surface of the impeller 44 is larger, the generated acting force will also be greater than that of the runner at the bottom. Therefore, when the runner and the impeller 44 rotate simultaneously, the rotating shaft 43 will move upward.

[0048] Referring to 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 where the discharge hole 410 extends into the inner part of the bottom shell 35, the more the medicament that can flow out through the discharge hole 410 is restricted. The remaining structure is the same as that of Embodiment 1.

[0050] Combined with Embodiments 1-2, the working principle of the present invention is as follows: The device is buried underground, and the water inlet 2 is connected to the sewer. Rainwater enters the interior of the storage tank 1 through the water inlet 2 after being collected and pretreated by the sewer. When the water in the storage tank 1 is needed, the water in the storage tank 1 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 under the action of the pressure difference through the suction pipe 39. Since the suction pipe 39 is connected to the bottom shell 35 at an oblique cut angle, the water flow will flow along the inner wall of the bottom shell 35 after entering the bottom shell 35 and form a swirl under the guidance of the inner wall of the bottom shell 35. Due to the suction effect of the water pump 310, the water flow will flow upward in a spiral rising state. The water flow will generate a centrifugal force in the swirl state, causing the solid impurities carried in the water to be thrown towards the position close to the inner wall. As the water flow rises, the impurities will be thrown into the sedimentation chamber 33 and discharged from the storage tank 1 through the sewage pipe 34. In this state, the closer to the center of the swirl, the fewer impurities there are. The central water flow with fewer impurities rises into the vertical pipe 31 and is shunted by the shunt ring 38 while entering the vertical pipe 31. The water flow and the carried impurities relatively closer to the outside of the swirl center are guided to the inner wall of the inner shell 36 and enter the sedimentation chamber 33 under the guidance of the inclined inner wall of the inner shell 36. After the water flow enters the vertical pipe 31, it will pass through the guide plate 312. During the process of passing through the guide plate 312, the water flow will be deflected and guided by it to form an upward swirl again. And because the diameter of the top of the guide plate 312 is larger than that of the bottom, the cross-sectional area of the channel formed between the top of the guide plate 312 and the vertical pipe 31 becomes smaller. When the water flow passes through the smaller channel, the flow rate increases, enhancing the centrifugal force of the water flow and performing secondary separation on the water flow. The impurities moving along the inner wall of the vertical pipe 31 in the swirl state enter the interlayer formed by the upper shell 32 and the inner shell 36 through the square hole 313 when passing through the square hole 313, and then enter the sedimentation chamber 33 after passing through the eddy current ring. Under the action of the retaining ring 37, it is prevented from flowing into the interior of the bottom shell 35. The eddy current ring 314 can prevent backflow so that the water flow can only flow from the top to the bottom of the eddy current ring 314. The interior of the medicine supply tank 412 can store the medicine for purifying water quality, and the medicine can fill the interior of the cover 411 under the action of gravity. When water enters through the suction pipe 39, the water flow will push 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 runner at the bottom to rotate. After the runner rotates, it drives the medicine to flow upward. While the rotating shaft 43 moves upward, it drives the cross plate 46 to move upward together. The cross plate 46 moves upward to compress the spring 45 to store energy, and at the same time when the cross plate 46 moves upward, it will drive the cylinder 48 connected to it to move upward together. After the cylinder 48 moves upward, the discharge hole 410 will move above the telescopic hole 42. At this time, the medicine flows into the deep groove 49 and flows into the interior of the bottom shell 35 through the discharge hole 410, and is mixed with the water flow pumped into the bottom shell 35 by the suction pipe 39 under the swirl action, so that the impurities in the water flow react and polymerize into solids or flocs.Subsequently, it is separated by the separating mechanism 3. The faster the water flow rate entering the interior of the bottom shell 35 through the water 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 is driven to rise. At this time, the more the discharge hole 410 is located above the telescopic hole 42, the more the medicament can flow out through the discharge hole 410, and vice versa, the less the medicament flows out. When the water pump 310 stops, the water suction pipe 39 no longer intakes water, the impeller 44 stops rotating, and no more lifting force is provided. At this time, the cross plate 46 will descend and reset under the action of the spring 45, and drive the cylinder 48 to reset, stopping the medicament supply.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A rainwater storage device for a water-saving city sewer in rainy days, including a storage tank and a water inlet arranged at the top of the storage tank, characterized in that: It further includes a separation mechanism disposed on the side of the piggy bank away from the water inlet, and a dosing mechanism disposed at the bottom of the separation mechanism; The separation mechanism is used to separate impurities in the water, and the dosing mechanism is used to input water purification agents; The separation mechanism includes a pumping unit disposed on the side of the piggy bank away from the water inlet, the pumping unit is used to pump the rainwater inside the piggy bank, a vertical pipe disposed at the bottom of the pumping unit, an upper shell disposed at the top of the vertical pipe, a sedimentation chamber disposed at the bottom of the outer shell, a sewage pipe disposed on the side of the sedimentation chamber close to the water inlet, a bottom shell disposed at the bottom of the sedimentation chamber, an inner shell disposed in the middle of the vertical pipe, a retaining ring disposed at the bottom of the inner shell, a flow dividing ring disposed at the bottom of the vertical pipe, a water suction pipe disposed at the front of the bottom shell, and a secondary separation unit disposed inside the vertical pipe for separating impurities again.

2. The rainwater storage device for sewer under rainy days in a water-saving city according to claim 1, wherein: The cross-section of the sedimentation chamber is oval, and the bottom is higher than the height of the bottom shell.

3. The rainwater storage device for sewer in rainy days based on a water-saving city according to claim 1, characterized in that: The pumping unit includes a water pump disposed on the side of the piggy bank away from the water inlet, and a connecting pipe disposed on the side of the water pump away from the water outlet, and the bottom of the connecting pipe is fixedly connected to the top of the vertical pipe.

4. The rainwater storage device for sewer in rainy days based on the water-saving city according to claim 1, wherein: The secondary separation unit includes a guiding plate disposed inside the vertical pipe, two square holes symmetrically opened at the front and rear of the vertical pipe, and a vortex ring disposed at the bottom of the inner shell.

5. The rainwater storage device for sewer under rainy days in a water-saving city according to claim 4, characterized in that: The outer shape of the guiding plate is spiral, and the width of the bottom is smaller than that of the top.

6. The rainwater storage device for sewer in rainy days based on the water-saving city according to claim 1, characterized in that: The dosing mechanism includes a through hole opened at the bottom of the bottom shell, two telescopic holes symmetrically opened on both sides of the through hole, a rotating shaft disposed inside the through hole, an impeller disposed at the top of the rotating shaft, a spring sleeved on the middle of the rotating shaft, a cross plate disposed at the bottom of the spring, the top and bottom of the spring are fixedly connected to the bottom shell and the cross plate respectively, a limiting hole opened at the top of the cross plate, two cylinders symmetrically disposed on both sides of the cross plate, a deep groove opened at the bottom of the cylinder, two discharge holes symmetrically opened at the front and rear of the deep hole, a cover shell disposed at the bottom of the bottom shell, and a medicine supply tank disposed at the bottom of the cover shell.

7. The rainwater storage device for sewer in rainy days based on the water-saving city according to claim 6, characterized in that: A runner is disposed at the bottom of the rotating shaft, the impeller and the runner are similar in shape, and the pressure surface directions of the blades of the impeller and the runner are opposite.

8. The rainwater storage device for sewer under rainy days in a water-saving city according to claim 6, characterized in that: The diameter of the cylinder matches the diameter of the telescopic hole, and the top width of the discharge hole is larger than the bottom width.

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