Rainwater purification, regulation and storage system

Abstract

The invention provides a rainwater purification, regulation and storage system, and relates to the technical field of rainwater treatment. The well body is divided into a first cylinder part and a second cylinder part, an adsorption unit is arranged in a seepage storage space defined by the second cylinder part and is communicated with the outside of the well body, a sewage interception hanging basket is arranged on an opening of the first cylinder part, and a filtering unit is arranged in the first cylinder part; a filtering part of the filtering unit wraps an outflow pipe and is attached to the mounting plate, a communicating hole is formed in the outflow pipe, the filtering part is covered with a housing, gaps are formed between the bottom end of the housing and the mounting plate and between the inner side wall of the housing and the outer side wall of the filtering part, a one-way exhaust valve is arranged at the top end of the outflow pipe, and the upper portion of the one-way exhaust valve is covered with an exhaust valve cap; a first floating body and a second floating body are arranged in an outflow pipe of the filtering unit, the bearing part is fixed to the inner side wall of the outflow pipe and bears the second floating body, and the first floating body can block the outflow pipe. A deep shaft type structure is adopted, and the occupied area is small; and the filtering unit realizes unpowered backwashing by utilizing a siphonic effect, so that the blockage of the filtering part is relieved, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of rainwater treatment, and in particular to a rainwater purification and storage system. Background Art

[0002] The direct discharge of rainwater runoff not only causes pollution to the water environment, but also causes waste of water resources. By recycling and reusing rainwater, sustainable utilization of rainwater resources can be achieved.

[0003] For areas such as green spaces, rivers and lakes, it is relatively simple to purify, absorb and utilize rainwater on site. However, the urban surface is highly hardened and green space is limited, which easily generates a large amount of rainwater runoff. Therefore, a rainwater purification and storage system is an indispensable facility.

[0004] The Chinese patent with the announcement number CN111359294A discloses a sponge city rainwater collection and purification system with low energy consumption, which includes a water collection device, a water purification device and a water storage device. The height of the vertical filter cylinder is less than the water collection device and greater than the water storage device. A scum collection net is set up in the filter cylinder, and a mud discharge pipe is provided at the bottom of the filter cylinder. The water inlet pipe is arranged along the tangent direction of the filter cylinder, and the scum collection net is located between the water inlet pipe and the water outlet pipe. However, the water collection device, the water purification device and the water storage device are arranged horizontally, occupying a large area, which is not suitable for high-density urban areas with tight land resources. At the same time, during the working process, the sedimentation of solid impurities is achieved by forming a vortex in the filter cylinder. However, during the use of the rainwater collection system, the scum collection net will retain the scum after collecting it. As the scum increases, the water permeability of the scum collection net decreases, affecting the rotation speed of the vortex in the water purification device, and even affecting the formation of the vortex, which may easily cause the water purification device to fail to work. Summary of the invention

[0005] In view of this, the present application provides a rainwater purification and storage system to solve the problem that the existing rainwater purification devices occupy a large area and are not suitable for high-density urban areas with tight land resources, and the problem that with the use of the rainwater purification and storage system, the filtering performance of the rainwater purification and storage system drops sharply, and even causes the device to fail to work normally.

[0006] The present application provides a rainwater purification and storage system, which includes a well body, a mounting plate, a pollution interception hanging basket and a filter unit, wherein the mounting plate is connected to the inner side wall of the well body to divide the well body into a first cylinder part and a second cylinder part which are sequentially arranged along the gravity direction, the second cylinder part encloses a seepage storage space, an adsorption unit is arranged in the seepage storage space, the seepage storage space is communicated with the outside of the well body, the first cylinder part has an opening, the pollution interception hanging basket is arranged at the opening, and the filter unit is arranged inside the first cylinder part;

[0007] The filter unit comprises a casing, a filter part, an outlet pipe, a one-way exhaust valve, an exhaust valve cap, a supporting part, a first float and a second float, the filter part is covered on the outside of the outlet pipe, a connecting hole is provided on the side wall of the outlet pipe, the casing is arranged on the outside of the filter part, the filter part is fitted with the mounting plate, the end of the casing is spaced apart from the mounting plate, a gap is provided between the inner side wall of the casing and the outer side wall of the filter part, the top of the outlet pipe extends out from the casing, the one-way exhaust valve is provided at the top end of the outlet pipe, and the exhaust valve cap covers the one-way exhaust valve;

[0008] The second float and the first float are sequentially arranged inside the outlet pipe along the gravity direction, the supporting portion is fixed on the inner wall of the outlet pipe, the supporting portion can support the second float, and the first float can block the outlet pipe.

[0009] Preferably, the interior of the outlet pipe is divided into a first cavity and a second cavity arranged in sequence along the gravity direction, the second cavity is connected to the seepage storage space, the diameter of the second cavity gradually decreases in the gravity direction, and the first float can block the second cavity.

[0010] Preferably, the first floating body is provided with a limiting hole, the limiting hole extends along the gravity direction, and a portion of the second floating body is located in the limiting hole.

[0011] Preferably, the first float includes a blocking portion, a supporting portion and a limiting portion, one end of the supporting portion is connected to the blocking portion, the other end of the supporting portion is connected to the limiting portion, the limiting portion is provided with the limiting hole, and the blocking portion can block the second cavity.

[0012] Preferably, the second float includes a main body, an insertion part and a transfer rod, the main body and the insertion part are connected by the transfer rod, the supporting part can support the main body, and part of the insertion part is located in the limiting hole.

[0013] Preferably, the limiting portion includes a surrounding plate and a limiting plate, the surrounding plate surrounds the supporting portion, one end of the limiting plate is connected to the supporting portion, the other end of the limiting plate is connected to the surrounding plate, and the limiting hole is provided on the limiting plate.

[0014] Preferably, the rainwater purification and storage system further comprises a baffle, which is fixed on the mounting plate and is higher than the filter unit;

[0015] The baffle is connected to the inner wall of the first cylinder portion, and the baffle and the inner wall of the first cylinder portion enclose a first overflow space. The mounting plate is provided with a discharge port, and the seepage storage space is connected to the first overflow space through the discharge port. The first overflow space can be connected to the outside of the well body.

[0016] Preferably, the rainwater purification and storage system further comprises an overflow weir and an external discharge pipe, the overflow weir is fixed on the mounting plate, the overflow weir is higher than the filter unit, and the baffle is higher than the overflow weir;

[0017] The overflow weir is connected to the inner side wall of the first cylinder portion, the overflow weir, the baffle plate and the inner side wall of the first cylinder portion enclose a second overflow space, and the outer discharge pipe is connected to the second overflow space.

[0018] Preferably, the rainwater purification and storage system further comprises a water baffle plate, an overflow port is formed on the baffle plate, the water baffle plate is arranged on the overflow port, and the water baffle plate is arranged to only allow rainwater in the first overflow space to enter the second overflow space.

[0019] Preferably, a water seepage hole is provided on the second cylinder portion, and the seepage storage space is connected with the outside of the second cylinder portion through the water seepage hole.

[0020] In the rainwater purification and storage system of the present application, the well body adopts a deep wellbore structure, and the mounting plate, the sewage interception basket and the filter unit are all installed in the well body. The entire rainwater purification and storage system occupies a small area, which makes the rainwater purification and storage system of the present application applicable to high-density urban areas with tight land resources. At the same time, during the use of the rainwater purification and storage system, the rainwater filtered by the sewage interception basket enters the outlet pipe through the connecting hole after being filtered by the filter unit, and then enters the seepage storage space through the outlet pipe. After the adsorption unit in the seepage storage space absorbs pollutants, it flows out of the well body into the soil to replenish groundwater. When the water level in the first cylinder is lower than the lower end of the housing, rainwater enters from the gap between the housing and the mounting plate, and enters the outlet pipe through the filtration part. The first float floats up under the action of the water flow, slowly opens the outlet pipe, and allows rainwater to enter the infiltration storage space through the lower end of the outlet pipe. When the water level rises to be flush with the lower end of the housing, the rainwater and the housing block the outside air from entering the filtration part. As the water level continues to rise, the water level is higher than the lower end of the housing, and the rainwater is evenly distributed through the gap between the inner wall of the housing and the outer wall of the filtration part. At this time, the speed at which rainwater accumulates in the outlet pipe is faster than the outflow rate, and the water level in the outlet pipe increases. When the water level increases to a predetermined depth, the second float floats up, thereby increasing the outflow rate again. At the same time, as rainwater enters the outlet pipe and occupies the air space, the air is discharged from the one-way exhaust valve. When the outflow rate of the outlet pipe is greater than the flow rate of the rainwater filtered into the outlet pipe, negative pressure will be generated under the housing, thereby generating a siphon effect. Since the external air cannot enter the housing of the filter unit through the one-way exhaust valve, a fixed water column will be established under the housing. When the filtered water is discharged through the outlet pipe, it will attract the rainwater in the first cylinder to pass through the entire filter part. When the rainwater entering the first cylinder decreases, as the filtered outflow continues, the water level outside the filter unit drops to the lower end of the housing, air enters the outlet pipe, the internal and external pressures are balanced, and the siphon effect is broken. At this time, the rainwater in the filter part falls under the action of gravity, flushing the internal filler of the filter part. The filter unit of the present application can use the mechanical energy of rainwater itself and the siphon effect to achieve self-cleaning of the filter part, which can effectively remove the runoff particles accumulated in the filter part, slow down the blockage of the filter part, and extend the service life of the rainwater purification and storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram showing the structure of a rainwater purification and storage system according to an embodiment of the present invention;

[0023] Figure 2 A cross-sectional view showing a rainwater purification and storage system according to an embodiment of the present invention from one perspective;

[0024] Figure 3 A cross-sectional view showing a filter unit;

[0025] Figure 4 A schematic diagram showing the structure of the outlet pipe is shown;

[0026] Figure 5 A schematic structural diagram of a second floating body is shown;

[0027] Figure 6 A schematic structural diagram of a first floating body is shown;

[0028] Figure 7 A schematic diagram showing the structure of the supporting part;

[0029] Figure 8 A diagram showing the relative positions of the baffle and the overflow weir;

[0030] Fig. 9 A cross-sectional view showing another perspective of the rainwater purification and storage system of an embodiment of the present invention;

[0031] Fig.10 A cross-sectional view showing the rainwater purification and storage system of the present invention in combination with a bioretention facility;

[0032] Fig.11 A schematic structural diagram showing the portion of the top of the outlet pipe used to connect with the exhaust valve cap.

[0033] Icons: 1-well body; 11-first barrel; 12-second barrel; 121-seepage hole; 13-seepage storage space; 2-installation plate; 3-traffic interception basket; 4-filter unit; 41-filter part; 42-outflow pipe; 421-connecting hole; 422-thread; 43-cover; 431-top plate; 432-side plate; 441-first cavity; 442-second cavity; 45-first floating body; 451-blocking part; 452-support part; 453-limiting part; 4531-enclosing plate; 45 32-limiting plate; 4533-limiting hole; 46-second floating body; 461-main body; 462-insertion part; 463-transfer rod; 47-supporting part; 471-first ring; 472-second ring; 473-fixing rod; 48-one-way exhaust valve; 49-exhaust valve cap; 5-overflow weir; 61-external discharge pipe; 62-water retaining plate; 63-seepage pipe; 7-baffle; 71-first baffle; 72-second baffle; 8-adsorption unit; 91-biological retention facility; 92-gravel layer. DETAILED DESCRIPTION

[0034] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0035] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0036] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0037] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0038] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0039] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0040] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0041] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0042] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0043] The present application provides a rainwater purification and storage system, such as Figure 1 , Figure 2 and Figure 3As shown, the rainwater purification and storage system includes a well body 1, a mounting plate 2, a sewage interception hanging basket 3 and a filter unit 4. The mounting plate 2 is connected to the inner wall of the well body 1 to divide the well body 1 into a first cylinder 11 and a second cylinder 12 arranged in sequence along the gravity direction. The second cylinder 12 encloses a seepage storage space 13, and an adsorption unit 8 is arranged in the seepage storage space 13. The seepage storage space 13 is communicated with the outside of the well body 1. The first cylinder 11 has an opening, the sewage interception hanging basket 3 is arranged at the opening, and the filter unit 4 is arranged inside the first cylinder 11; the filter unit 4 includes a cover shell 43, a filter part 41, an outlet pipe 42, a one-way exhaust valve 48, an exhaust valve cap 49, a supporting part 47, a first float 45 and a second float 46. The filter part 41 is covered on the outlet pipe 42, a one-way exhaust valve 48, an exhaust valve cap 49, a supporting part 47, a first float 45 and a second float 46. Outside the tube 42, a connecting hole 421 is opened on the side wall of the outlet pipe 42, and the cover shell 43 is covered on the outside of the filter part 41. The filter part 41 is fitted with the mounting plate 2, and the end of the cover shell 43 is spaced apart from the mounting plate 2. There is a gap between the inner wall of the cover shell 43 and the outer wall of the filter part 41. The top of the outlet pipe 42 extends out from the cover shell 43, and a one-way exhaust valve 48 is arranged at the top of the outlet pipe 42. The exhaust valve cap 49 is connected to the outlet pipe 42 and covers the one-way exhaust valve 48; the second float 46 and the first float 45 are sequentially arranged inside the outlet pipe 42 along the direction of gravity, and the supporting part 47 is fixed on the inner wall of the flow pipe. The supporting part 47 can support the second float 46, and the first float 45 can block the outlet pipe 42.

[0044] In the rainwater purification and storage system of the present application, the well body adopts a deep wellbore structure, and the mounting plate 2, the sewage interception hanging basket 3 and the filter unit 4 are all installed in the well body 1. The entire rainwater purification and storage system occupies a small area, which makes the rainwater purification and storage system of the present application applicable to high-density urban areas with tight land resources. At the same time, during the use of the rainwater purification and storage system, the rainwater filtered by the sewage interception hanging basket 3 enters the outlet pipe 42 through the connecting hole 421 after being filtered by the filter part 41, and then enters the seepage storage space 13 through the outlet pipe 42. After the adsorption unit 8 in the seepage storage space 13 absorbs pollutants, it flows out of the well body 1 and enters the soil to replenish groundwater.

[0045] The filter unit 4 usually relies on hydraulic pressure to force rainwater to pass through the filter part 41. When the water level in the first cylinder part 11 is lower than the lower end of the cover shell 43, rainwater enters from the gap between the cover shell 43 and the mounting plate 2, is filtered through the filter part 41 and enters the outlet pipe 42, and the first float 45 floats up under the action of the water flow and slowly opens the outlet pipe 42. At this time, the outflow rate can be self-regulated by the buoyancy of the first float 45; when the water level rises to be flush with the lower end of the cover shell 43, the rainwater and the cover shell 43 block the outside air from entering the filter part 41; as the water level continues to rise, the water level is higher than the lower end of the cover shell 43, and the rainwater is evenly distributed through the gap between the inner wall of the cover shell 43 and the outer wall of the filter part 41. At this time, the speed at which rainwater accumulates in the outlet pipe 42 is faster than the outflow rate, and the water level in the outlet pipe 42 increases. When the water level increases to a predetermined depth, the second float 46 floats up, thereby increasing the outflow rate again. At the same time, as the rainwater enters the outlet pipe 42 and occupies the air space, the air is discharged from the one-way exhaust valve 48. When the outflow rate of the outlet pipe 42 is greater than the flow rate of the rainwater filtered into the outlet pipe 42, a negative pressure will be generated under the cover 43, thereby generating a siphon effect. Since the external air cannot enter the cover 43 of the filter unit 4 through the one-way exhaust valve 48, a fixed water column will be established under the cover 43. When the filtered water is discharged through the outlet pipe 42, it will attract the rainwater in the first cylinder 11 to pass through the entire filter part 41; when the rainwater entering the first cylinder 11 decreases, as the filtering outflow continues, the external water level of the filter unit 4 drops to the lower end of the cover 43, and the air enters the outlet pipe 42. The internal and external pressures are balanced, and the siphon effect is broken. At this time, the rainwater in the filter part 41 falls under the action of gravity, and the internal filler of the filter part 41 is flushed. The filter unit of the present application can utilize the mechanical energy and siphon effect of rainwater itself to achieve self-cleaning of the filter part, which can effectively remove the runoff particles accumulated in the filter part 41, reduce the clogging of the filter part 41, and extend the service life of the rainwater purification and storage system.

[0046] Optionally, in an implementation form of the rainwater purification and storage system, Figure 1 and Figure 2 As shown, the second cylinder 12 is provided with a seepage hole 121, and rainwater after pollutants are adsorbed by the adsorption unit 8 can flow out through the seepage hole 121 and enter the soil. The second cylinder 12 can be provided with seepage holes 121 at both the bottom and the side, or only at the side.

[0047] In another embodiment of the rainwater purification and storage system, the second cylinder 12 may not have the seepage hole 121. In this case, a pumping pipe may be provided at the bottom of the second cylinder 12, a water pump may be provided on the pumping pipe, and a nozzle may be connected to the end of the pumping pipe so that the filtered rainwater can be used to irrigate the green space. In addition, a solar panel may be placed on the ground, and the solar panel is connected to a battery to provide energy for the operation of the water pump. Rainwater can be stored in the seepage storage space 13, and when it is necessary to irrigate the green space, the water pump is started so that the purified rainwater can be used to irrigate the green space.

[0048] In addition, the rainwater passes through the pollution interception basket 3 before entering the interior of the first cylinder 11 , so that large particles of pollutants in the rainwater are intercepted, thereby reducing the burden on the subsequent filtering unit 4 and the adsorption unit 8 .

[0049] Further, the filter section 41 is capable of removing heavy metals, oils and fats from the rainwater flowing through. The filter section 41 can select one or more filter media according to the composition and content of local rainwater pollutants. For example, the filter medium can be vermiculite, activated carbon, zeolite or perlite. When the filter section 41 includes only one filter medium, the filter medium can be fixed to the outside of the outlet pipe 42 by a stainless steel mesh. When the filter section 41 includes multiple filter media, the multiple filter media are arranged in sequence along the radial direction of the outlet pipe 42, and each filter medium can be fixed by a stainless steel mesh. The adsorption unit 8 is capable of removing heavy metals, oils and fats from the rainwater flowing through. The adsorption unit 8 can select a suspended adsorption material according to the composition and content of local rainwater pollutants.

[0050] Optionally, the well body 1 can be formed by assembling and connecting a plurality of cylinder units, and two adjacent cylinder units among the plurality of cylinder units are flatly butted together to achieve assembly. The height of each cylinder unit and the number of cylinder units can be selected according to the amount of rainwater required to be stored by the rainwater purification and storage system and the groundwater level of the location. The mounting plate 2 is connected to the inner side wall of the well body 1, thereby dividing the interior of the well body 1 into a first cylinder portion 11 and a second cylinder portion 12.

[0051] In the embodiments of the present application, Figure 2 and Figure 3As shown, the housing 43 may include a top plate 431 and a side plate 432, the side plate 432 is arranged around the top plate 431, the upper end of the filter 41 is fitted with the top plate 431, the lower end of the filter 41 is fitted with the mounting plate 2, and the lower end of the side plate 432 is spaced from the mounting plate 2, so that a gap for rainwater to flow in is formed between the side plate 432 and the mounting plate 2, and there is also a gap between the inner side wall of the housing 43 and the outer side wall of the filter 41. When the water level in the first cylinder 11 is lower than the lower end of the side plate 432, rainwater can directly enter the filter 41 through the gap between the side plate 432 and the mounting plate 2. When the water level in the first cylinder 11 is higher than the lower part of the side plate 432, rainwater is evenly distributed through the gap between the side plate 432 and the filter 41. After being filtered by the filter 41, the rainwater flows into the seepage storage space 13 enclosed by the second cylinder 12 through the outflow pipe 42.

[0052] Optionally, the outlet pipe 42 can be divided into a first section, a second section and a third section from top to bottom. The first section and the second section are both provided with a connecting hole 421. The first section is a structure of equal inner diameter, thereby enclosing a cylindrical first cavity 441; the inner diameter of the second section gradually decreases from top to bottom, thereby enclosing a second cavity 442 with a gradually decreasing diameter in the gravity direction. A thread 422 is provided on the outer wall of the third section, and a threaded hole adapted to the outlet is provided on the mounting plate 2, so that the outlet pipe 42 can be connected to the mounting plate 2 in the form of a thread, and at the same time, the outlet pipe 42 can be connected to the seepage storage space 13 enclosed by the second barrel 12. The first float 45 can block the lower opening of the second cavity 442. As rainwater enters the first barrel 11 and enters the outlet pipe 42 after filtration, the first float 45 gradually floats up to open the lower opening of the second cavity 442. As the amount of rainwater entering the outlet pipe 42 increases, the buoyancy of the first float 45 increases, and the first float 45 gradually floats up. In this way, the outflow rate of rainwater flowing out of the outlet pipe 42 can be self-regulated by the buoyancy.

[0053] like Figure 4 and Figure 6 As shown, the first floating body 45 includes a blocking portion 451, a supporting portion 452 and a limiting portion 453. The supporting portion 452 is cylindrical, one end of the supporting portion 452 is connected to the blocking portion 451, and the other end of the supporting portion 452 is connected to the limiting portion 453. The limiting portion 453 is provided with a limiting hole 4533, and the limiting hole 4533 extends along the gravity direction. Part of the second floating body described below can extend into the limiting hole 4533. In this way, the floating of the first floating body 45 can be guided by the second floating body 46. The blocking portion 451 is semi-ellipsoidal, and the blocking portion 451 can block the lower opening of the second cavity 442.

[0054] Optionally, the limiting portion 453 includes a surrounding plate 4531 and a plurality of limiting plates 4532, the surrounding plate 4531 surrounds the support portion 452, one end of the limiting plate 4532 is connected to the support portion 452, and the other end of the limiting plate 4532 is connected to the surrounding plate 4531, and a limiting hole 4533 is provided at a position corresponding to the insertion portion 462 described below on each limiting plate 4532, and a portion of the second floating body 46 described below can be located in the limiting hole 4533. Preferably, the number of the limiting plates 4532 is 4, that is, the limiting portion 453 includes 4 limiting plates 4532 and 1 surrounding plate 4531, and the 4 limiting plates 4532 are arranged at intervals along the circumference of the support portion 452.

[0055] In the embodiments of the present application, Figure 3 , Figure 4 and Figure 5 As shown, the second float 46 is arranged in the outlet pipe 42, the second float 46 is suspended relative to the outlet pipe 42, and the supporting portion 47 can support the second float 46. Part of the second float 46 is located in the limiting hole 4533. When the supporting portion 47 supports the second float 46, the first float 45 can float relative to the second float 46. In this way, when the water level of rainwater in the outlet pipe 42 is low, only the first float 45 floats. Since the supporting portion 47 supports and part of the second float 46 is located in the limiting hole 4533, the second float 46 will not generate resistance to the floating of the first float 45. When the water level of rainwater in the outlet pipe 42 is high, both the first float 45 and the second float 46 can float.

[0056] Alternatively, if Figure 7 As shown, the supporting part 47 includes a first ring 471, a second ring 472 and a fixing rod 473. The diameter of the first ring 471 is larger than the diameter of the second ring 472. The first ring 471 is fixed on the inner wall of the outlet pipe 42. One end of the fixing rod 473 is connected to the first ring 471, and the other end of the fixing rod 473 is connected to the second ring 472. The second ring 472 can support the second float 46.

[0057] Furthermore, if Figure 4 and Figure 5As shown, the second float 46 includes a main body 461 and an inserting part 462, the main body 461 and the inserting part 462 are connected by a transfer rod 463, the main body 461 is cylindrical, the diameter of the transfer rod 463 is smaller than the diameter of the main body 461, so that the connection between the main body 461 and the transfer rod 463 is stepped, and the supporting part 47 can fit with the lower end of the main body 461, so as to support the second float 46. The inserting part 462 can be "C" shaped, the upper end of the inserting part 462 is aligned with the lower end of the transfer rod 463, and part of the inserting part 462 is located in the limiting hole 4533, and the lower end of the inserting part 462 is located at the lower side of the limiting plate 4532. The number of the inserting parts 462 can be multiple, and the multiple inserting parts 462 are arranged at intervals along the circumference of the transfer rod 463, and the number of the inserting parts 462 is the same as the number of the limiting holes 4533. Preferably, the number of the insertion portions 462 is four, and the four insertion portions 462 are respectively located in the four limiting holes 4533 .

[0058] Furthermore, if Figure 3 , Figure 4 and Fig.11 As shown, the exhaust valve cap 49 is connected to the upper end of the outlet pipe 42 by a partially threaded connection. The upper end of the outlet pipe 42 is arranged with threads and non-threads in a circumferential direction. The threaded part fits the inner wall of the exhaust valve cap 49, and there is a gap between the non-threaded part and the inner wall of the exhaust valve cap 49, so that the air discharged by the one-way exhaust valve 48 flows out from the gap. When the water level of rainwater is higher than the lower end of the cover 43, the outside air no longer enters the filter unit 4, and the air in the filter unit 4 can be discharged through the one-way exhaust valve 48, thereby providing conditions for the filter unit 4 to form a siphon effect, so as to achieve flushing of the filter unit 4 and extend the service life of the filter unit 4.

[0059] In the embodiments of the present application, Figure 1 , Figure 8 and Fig. 9 As shown, the rainwater purification and storage system also includes a baffle 7, which is fixed on the mounting plate 2. The baffle 7 is higher than the filter unit 4. The baffle 7 may include a first baffle 71 and a second baffle 72 arranged vertically. The first baffle 71, the second baffle 72 and the inner wall of the first barrel 11 enclose a first overflow space, and the first baffle 71, the overflow weir 5 described below and the inner wall of the first barrel 11 enclose a second overflow space described below. The mounting plate 2 is provided with a discharge port, and the seepage storage space 13 is connected to the first overflow space through the discharge port, and the first overflow space can be connected to the outside of the well body 1. When there is too much rainwater in the seepage storage space 13, the rainwater enters the first overflow space through the discharge port, and the first overflow space is connected to the second overflow space described below, so that the rainwater is discharged into the municipal pipe network through the second overflow space described below and the external discharge pipe 61.

[0060] Optionally, the portion of the mounting plate 2 corresponding to the first overflow space may be hollowed out to ensure that when there is too much rainwater in the seepage storage space 13, the rainwater can enter the first overflow space through the discharge port.

[0061] Furthermore, the rainwater purification and storage system also includes an overflow weir 5 and an external discharge pipe 61. The overflow weir 5 is fixed on the mounting plate 2. The overflow weir 5 is higher than the filter unit 4. The baffle 7 is higher than the overflow weir 5. The overflow weir 5 is connected to the inner wall of the first cylinder 11. The overflow weir 5, the baffle 7 and the inner wall of the first cylinder 11 enclose a second overflow space. The external discharge pipe 61 is connected to the second overflow space. When the rainwater runoff exceeds the flow capacity of the filter unit 4 and the water level of the rainwater is higher than the overflow weir 5, the rainwater flows over the overflow weir 5 into the second overflow space, and is then discharged into the municipal rainwater pipe network through the external discharge pipe 61.

[0062] In addition, the baffle 7 is higher than the overflow weir 5 , which can prevent rainwater that has not been filtered by the filter unit 4 from entering the first overflow space, thereby preventing rainwater that has not been filtered by the filter unit 4 from entering the seepage storage space 13 enclosed by the second cylinder 12 .

[0063] Optionally, the rainwater purification and storage system further includes a water baffle 62, an overflow port is provided on the first baffle 71 of the baffle 7, the water baffle 62 is arranged on the overflow port, and the water baffle 62 is arranged to only allow rainwater in the first overflow space to enter the second overflow space, in other words, the water baffle 62 can only be opened in one direction. In this way, after the rainwater enters the first overflow space through the discharge port, the water flow impacts the water baffle 62, causing the water baffle 62 to open, and the rainwater in the first overflow space enters the second overflow space, and then is discharged into the municipal rainwater pipe network through the external discharge pipe 61.

[0064] The parameter design of the rainwater purification and storage system can be determined based on the local specific conditions. The design recurrence period of the filtration unit 4 can generally be 0.25 to 0.5 years, and 0.5 to 1 year in arid areas. The design recurrence period of the second overflow weir 5 can generally be 3 to 5 years.

[0065] The rainwater flow rate under the design return period can be calculated according to the formula method. The filtration capacity of the rainwater purification and storage system needs to exceed the rainwater flow rate under the design return period, so that the rainwater purification and storage system can meet the purification needs of rainwater. Specifically, the rainwater flow rate under the design return period Q 1 It can be calculated by the following formula:

[0066] Q 1 =ΨqF

[0067] In the formula, Q 1 -Rainwater flow rate under the design return period (L / s);

[0068] q-design rainstorm intensity (L / s·ha), calculated by the local rainstorm intensity formula;

[0069] F-catchment area (ha), that is, the area of ​​the area where the rainwater purification and storage system is responsible for treating rainwater;

[0070] Ψ-the comprehensive flow runoff coefficient of the catchment area.

[0071]

[0072] Where, q-design rainstorm intensity (L / s·ha), taking Jiujiang City as an example;

[0073] P-design return period (years), the filtration unit 4 can take P as 0.25-0.5, and the overflow weir 5 can take P as 3-5;

[0074] t-rainfall duration (min);

[0075] Optionally, the stormwater flow rate Q under the design return period 1 Hydrological and hydrodynamic model simulation can also be used for calculation.

[0076] Filter capacity Q of filter unit 4 2 It can be calculated by Darcy's law, that is, the filtration capacity Q 2 It can be calculated by the following formula:

[0077]

[0078] In the formula, Q 2 - Filtration capacity of filtration unit 4 (m 3 / s);

[0079] k - permeability of the filter medium in the filter unit 41 (m 2 );

[0080] A-filtration area (m 2 ), A = πDH, D is the outer diameter of the filter portion 41, (m), H is the height of the filter portion 41, (m);

[0081] Δp-pressure difference between the inside and outside of the filter 41 (pa);

[0082] μ-dynamic viscosity of rainwater (pa·s);

[0083] L-flow path length, i.e., thickness of the filter portion 41 (m);

[0084] The filtering capacity Q of the filtering unit 4 can be calculated by the above formula: 2 Based on the number of filtering units 4 in the rainwater purification and storage system, the filtering capacity Q' of the rainwater purification and storage system can be obtained.

[0085] Q′=nQ 2

[0086] Where, W′ is the filtering capacity of the rainwater purification and storage system, (m 3 / s);

[0087] n-the number of filtering units 4 in the rainwater purification and storage system;

[0088] Taking the number of filtering units 4 as 3 as an example, the filtering capacity of the rainwater purification and storage system is Q'=3Q 3 The filtration capacity Q' of the rainwater purification and storage system needs to be greater than the rainwater flow Q under the design return period. 1 , that is, Q'=αQ 1 , α is the safety factor, which can be 1.1 to 1.2. In this way, the filter unit 4 can be designed first, and Q'>Q 1 A verification is performed. If the relationship is satisfied, the filter unit 4 meets the design requirements. If the relationship is not satisfied, the filter unit 4 can be redesigned and verified again until a filter unit 4 that meets the relationship is designed. At this time, the filter unit 4 meets the purification requirements for rainwater.

[0089] The infiltration storage space 13 needs to receive rainwater filtered by the filter unit 4, and its capacity V needs to be greater than the amount of water processed by the filter unit 4, that is, V ≥ Q'T;

[0090] V=V 蓄 +V 渗

[0091] V 蓄 =πr 2 h

[0092] V 渗 =NAvT

[0093] Where V is the capacity of the seepage storage space 13, (m 3 );

[0094] r is the radius of the seepage storage space 13, (m);

[0095] h is the height of the seepage storage space 13, (m);

[0096] N is the number of water seepage holes 121;

[0097] A is the area of ​​a single water seepage hole 121, (m 2 );

[0098] v is the average flow velocity of the water seepage hole 121, (m / s)

[0099] T is the total filtration time of the filtration unit 4, (s);

[0100] Furthermore, in order to ensure that all rainwater overflows when the design return period is exceeded, hydraulic calculations need to be performed on the overflow weir 5. The overflow weir 5 is designed to be a thin-walled weir, and the weir flow rate Q 3 The calculation formula is:

[0101]

[0102] In the formula, Q 3 -Weir flow rate (m 3 / s);

[0103] H-water head above weir (m);

[0104] H 1 - Height of overflow weir (m);

[0105] b-Weir width (m).

[0106] Take the design return period flow of overflow weir 5 as the weir flow flow Q 1 The critical value of b and H 1 Take the value and substitute it into the above formula, use MATLAB to solve the equation to get the value of H, and replace b, H 1 and H values ​​are brought into the rainwater purification and storage system for verification. If the verification results meet the requirements, then b, H 1 and H values ​​meet the design requirements. Otherwise, re-adjust b and H 1 Take values ​​until b, H 1 And H value meet the design requirements.

[0107] In addition, the rainwater purification and storage system of the present application can be used in conjunction with the biological retention facility 91, and the rainwater purification and storage system of the present application can be used to replace the overflow well of the biological retention facility 91 to achieve multi-objective regulation of water quality and quantity. The biological retention facility 91 can be connected to the seepage storage space 13 of the rainwater purification and storage system through the seepage and drainage pipe 63, and the seepage and drainage pipe 63 is laid with a slope of 0.5%, such as Fig.10 The outside of the second cylinder 12 needs to be filled with a gravel layer 92 to fix the rainwater purification and storage system.

[0108] The rainwater purification and storage system of the present application is used in conjunction with the bioretention facility 91, and can achieve comprehensive regulation of the water quality and water quantity of rainwater runoff through five working conditions, as follows:

[0109] Working condition 1: For the rainfall within the designed rainfall depth corresponding to the regional annual runoff total control rate, the rainwater enters the biological retention facility 91 through surface confluence in the initial stage. The rainwater infiltrates, is filtered and adsorbed in the biological retention facility 91, and is purified to meet the water quality indicators and replenish groundwater.

[0110] Working condition 2: When the design seepage corresponding to the total runoff control rate increases, a part of the rainwater enters the second cylinder 12 through the seepage pipe 63, and after being purified by the adsorption unit 8 to meet the water quality index, it replenishes the groundwater through the seepage holes 121 on the second cylinder 12.

[0111] Working condition three: When the rainfall is within the designed rainfall depth corresponding to the regional annual runoff total control rate, as the rainfall increases, the aquifer of the biological retention facility 91 reaches the highest water level and overflow occurs. The rainwater enters the unit of the first cylinder 11 through the sewage interception basket 3, is filtered by the filter unit 4 and enters the infiltration space 13 of the second cylinder 12, and is adsorbed by the adsorption unit 8 to replenish the groundwater.

[0112] Working condition 4: When the biological retention facility 91 and the storage volume in the second cylinder 12 are full, as the rainfall continues to increase, the amount of rainwater filtered through the device filtration unit 4 and the adsorption unit 8 increases, and the rainwater enters the first overflow space, then the rainwater breaks through the water retaining plate 62, and then is discharged into the municipal rainwater pipe network through the second overflow space and the external discharge pipe 61.

[0113] Working condition five: when the runoff water flow rate is greater than the filtering capacity of the filter unit 4 in the first cylinder 11 , the filter unit 4 overflows, and the rainwater flows over the overflow weir 5 into the second overflow space, and then is discharged into the municipal rainwater pipe network through the external discharge pipe 61 .

[0114] In the rainwater purification and storage system of the present application, the mounting plate 2, the sewage interception basket 3 and the filter unit 4 are all installed in the well body 1, so that the entire rainwater purification and storage system occupies a small area, and the rainwater purification and storage system can be applied to high-density urban areas with intensive land use and limited green space. The filter unit 4 makes full use of the mechanical energy of the rainwater itself and uses the siphon effect to achieve self-cleaning of the filter column, thereby extending the service life of the filter unit 4. At the same time, through the deep wellbore structure and the setting of baffles 7 and overflow weirs 5 of different heights, it can be used alone or in combination with the biological retention facility 91 to achieve the regulation and collection and utilization of the water quality, water volume and peak value of rainwater runoff under different rainfall conditions.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rainwater purification and storage system, characterized in that: The rainwater purification and storage system comprises a well body, a mounting plate, a pollution interception hanging basket and a filter unit, wherein the mounting plate is connected to the inner side wall of the well body to divide the well body into a first cylinder part and a second cylinder part sequentially arranged along the gravity direction, the second cylinder part encloses a seepage storage space, an adsorption unit is arranged in the seepage storage space, the seepage storage space is communicated with the outside of the well body, the first cylinder part has an opening, the pollution interception hanging basket is arranged at the opening, and the filter unit is arranged inside the first cylinder part; The filter unit comprises a casing, a filter part, an outlet pipe, a one-way exhaust valve, an exhaust valve cap, a supporting part, a first float and a second float, the filter part is covered on the outside of the outlet pipe, a connecting hole is provided on the side wall of the outlet pipe, the casing is arranged on the outside of the filter part, the filter part is fitted with the mounting plate, the end of the casing is spaced apart from the mounting plate, a gap is provided between the inner side wall of the casing and the outer side wall of the filter part, the top of the outlet pipe extends out from the casing, the one-way exhaust valve is provided at the top end of the outlet pipe, and the exhaust valve cap covers the one-way exhaust valve; The second float and the first float are sequentially arranged inside the outlet pipe along the gravity direction, the supporting portion is fixed on the inner wall of the outlet pipe, the supporting portion can support the second float, and the first float can block the outlet pipe.

2. The rainwater purification and storage system according to claim 1 is characterized in that: The interior of the outlet pipe is divided into a first cavity and a second cavity which are arranged in sequence along the gravity direction. The second cavity is connected to the seepage storage space. The diameter of the second cavity gradually decreases in the gravity direction. The first float can block the second cavity.

3. The rainwater purification and storage system according to claim 2 is characterized in that: The first floating body is provided with a limiting hole, the limiting hole extends along the gravity direction, and a portion of the second floating body is located in the limiting hole.

4. The rainwater purification and storage system according to claim 3 is characterized in that: The first float includes a blocking portion, a supporting portion and a limiting portion, one end of the supporting portion is connected to the blocking portion, the other end of the supporting portion is connected to the limiting portion, the limiting portion is provided with the limiting hole, and the blocking portion can block the second cavity.

5. The rainwater purification and storage system according to claim 4 is characterized in that: The second float includes a main body, an inserting part and a transfer rod, the main body and the inserting part are connected by the transfer rod, the supporting part can support the main body, and part of the inserting part is located in the limiting hole.

6. The rainwater purification and storage system according to claim 5 is characterized in that: The limiting portion includes a surrounding plate and a limiting plate, the surrounding plate surrounds the supporting portion, one end of the limiting plate is connected to the supporting portion, and the other end of the limiting plate is connected to the surrounding plate, and the limiting hole is opened on the limiting plate.

7. The rainwater purification and storage system according to claim 1 is characterized in that: The rainwater purification and storage system further comprises a baffle, which is fixed on the mounting plate and is higher than the filter unit; The baffle is connected to the inner wall of the first cylinder portion, and the baffle and the inner wall of the first cylinder portion enclose a first overflow space. The mounting plate is provided with a discharge port, and the seepage storage space is connected to the first overflow space through the discharge port. The first overflow space can be connected to the outside of the well body.

8. The rainwater purification and storage system according to claim 7 is characterized in that: The rainwater purification and storage system further comprises an overflow weir and an external discharge pipe, wherein the overflow weir is fixed on the mounting plate, the overflow weir is higher than the filter unit, and the baffle is higher than the overflow weir; The overflow weir is connected to the inner side wall of the first cylinder portion, the overflow weir, the baffle plate and the inner side wall of the first cylinder portion enclose a second overflow space, and the outer discharge pipe is connected to the second overflow space.

9. The rainwater purification and storage system according to claim 8, characterized in that: The rainwater purification and storage system also includes a water baffle, an overflow port is opened on the baffle, the water baffle is arranged on the overflow port, and the water baffle is arranged to only allow rainwater in the first overflow space to enter the second overflow space.

10. The rainwater purification and storage system according to claim 1, characterized in that: The second cylinder portion is provided with a water seepage hole, and the seepage storage space is communicated with the outside of the second cylinder portion through the water seepage hole.

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