Diversion device and bioretention facility with initial rainwater discarding function

Abstract

The utility model relates to a shunting device and a bioretention facility with an initial rainwater discarding function. The flow dividing device is provided with a water dividing disc, a first water outlet, a second water outlet and a water inlet are formed in the water dividing disc, a first water conveying channel is formed between the water inlet and the first water outlet, a second water conveying channel is formed between the water inlet and the second water outlet, and a blocking baffle is arranged in the first water conveying channel. A driving mechanism capable of driving the blocking baffle to move is arranged in the water distribution disc. A biological retention facility with an initial rainwater discarding function is provided with a retention pond, a drainage layer, a filter layer and a planting layer are arranged in the retention pond, a water inlet connected to a first water outlet of a water distribution disc is formed in the top of the retention pond, and a drainage port is formed in the bottom of the retention pond. Initial rainwater enters the water distribution disc and then is discharged from the second water outlet, when the rainwater flow is increased, the blocking baffle is driven to move towards the second water conveying channel, medium-term rainwater is discharged into the detention pond through the first water outlet, and the medium-term rainwater treated by the detention pond is collected.

Description

Technical Field

[0001] The utility model relates to a diversion device and a biological retention facility with an initial rainwater discarding function, and is applicable to the technical field of rainwater treatment equipment. Background Art

[0002] Urban stormwater runoff, initially carrying a large amount of pollutants such as organic matter, suspended solids, heavy metals, and oils due to scouring, is a typical example of non-point source pollution. The accumulated pollutant concentrations can exceed the standard influent quality of sewage treatment plants. If these pollutants are collected through rainwater collection systems and ultimately discharged into water bodies, they will pollute the receiving water bodies and seriously affect the water quality. If they enter rainwater treatment and reuse systems, the treatment process will be complicated and the treatment cost will increase. Therefore, it is necessary to discard the initial rainwater and enter the sewage network. However, in the middle and late stages of rainfall, the amount of rainwater is larger and the pollutant concentration is lower. It can be collected, treated, and reused, thus realizing the resource utilization of rainwater and alleviating the water crisis. Utility Model Content

[0003] The technical problem to be solved by the present invention is: in order to solve the above technical problem, the present invention provides a diversion device and a biological retention facility with an initial rainwater discharge function.

[0004] The technical solution adopted by the present invention is: a diversion device, comprising a water diversion tray, on which a first water outlet, a second water outlet, and a water inlet are arranged, the water inlet being arranged between the first water outlet and the second water outlet, a first water supply channel being formed between the water inlet and the first water outlet, and a second water supply channel being formed between the water inlet and the second water outlet, a blocking baffle being arranged in the first water supply channel, and a driving mechanism being arranged in the water diversion tray to drive the blocking baffle to move into the second water supply channel. Thus, when the blocking baffle is arranged in the first water supply channel, the blocking baffle blocks the first water supply channel, and liquid entering the water diversion tray from the water inlet can only flow out from the second water supply channel; when the driving mechanism drives the blocking baffle to move into the second water supply channel, the blocking baffle can block the second water supply channel, and liquid entering the water diversion tray from the water inlet can only flow out from the first water supply channel.

[0005] The first water supply channel and the second water supply channel are both fan-shaped. A rotating shaft is provided in the water distribution plate, and the rotating shaft is arranged at the center position of the fan-shaped first water supply channel and the second water supply channel. The blocking baffle is rotatably mounted on the rotating shaft. The driving mechanism has a push plate fixedly mounted on the blocking baffle, and the push plate is arranged in the second water supply channel.

[0006] A fixed baffle is provided in the second water delivery channel, and a spring is connected between the fixed baffle and the push plate.

[0007] Limiting plates are arranged in the first water delivery channel and the second water delivery channel.

[0008] A biological retention facility with the function of discarding initial rainwater includes the above-mentioned diversion device and has a retention pool. The retention pool is provided with a drainage layer, a filter layer, and a planting layer from bottom to top. A water inlet is provided at the top of the retention pool, and the water inlet is connected to the first water outlet of the water diversion tray through an inlet pipe. A drainage outlet is provided at the bottom of the retention pool.

[0009] A first drain pipe is connected to the drain outlet of the retention tank, and the first drain pipe is communicated with the clean water tank.

[0010] An overflow port is provided at the top of the retention tank, and a second drainage pipe is connected to the overflow port of the retention tank, and the second drainage pipe is connected to the municipal rainwater pipe network.

[0011] A third drain pipe is connected to the second water outlet of the water distribution tray, and the third drain pipe is connected to the sewage pipe network.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a fan-shaped first water delivery channel and a second water delivery channel on the water diversion plate, the first water delivery channel and the second water delivery channel are connected at the same water inlet, a blocking baffle arranged in the first water delivery channel is provided in the water diversion plate, the blocking baffle can be rotated along the center of the first fan-shaped water delivery channel and the second water delivery channel, so that the blocking baffle can move between the first water delivery channel and the second water delivery channel, the blocking baffle can block the first water delivery channel and the second water delivery channel, a push plate is fixedly installed on the blocking baffle, and the push plate is arranged in the second water delivery channel, so that after rainwater flows into the water diversion plate through the water inlet, the initial rainwater When the flow rate is small, under the action of the blocking baffle, the initial rainwater is discharged through the second water transfer channel; the flow rate of rainwater in the middle and late stages is large, and when the rainwater in the middle and late stages flows through the second water transfer channel, it pushes the push plate to rotate toward the second water outlet, and drives the blocking baffle to rotate toward the second water transfer channel. When the blocking baffle rotates to the water inlet position on the water diversion plate, the rainwater flowing into the water diversion plate from the water inlet will flow toward the first water transfer channel. At this time, the rainwater will push the blocking baffle to continue to rotate toward the second water transfer channel, preventing the blocking baffle from rotating toward the first water transfer channel and blocking the first water transfer channel. The utility model provides a fixed baffle in the water diversion plate and connects a spring between the fixed baffle and the push plate. When the push plate is pushed and the blocking baffle is driven to rotate toward the second water transfer channel, the spring is in a charged state. When the flow of rainwater flowing into the water diversion tray becomes smaller, the push plate and the blocking baffle can be driven to rotate toward the first water transfer channel under the reset action of the spring, and the first water transfer channel is blocked by the blocking baffle, preventing the next rainwater from flowing directly into the first water transfer channel when it flows into the water diversion tray. In this way, rainwater is discharged from the second water outlet when the initial water volume is small, and from the first water outlet when the middle and late water volume is large. The utility model connects the first water outlet of the water diversion tray to the water inlet at the top of the retention tank through the water inlet pipe, so that the middle and late rainwater can be discharged into the retention tank. The retention tank is provided with a drainage layer, a filtration layer and a planting layer from bottom to top. A first drainage pipe is connected to the drainage outlet of the retention tank, and the first drainage pipe is connected to the clean water tank. After the rainwater flows into the retention tank, it is processed and filtered in the retention tank, and finally discharged into the clean water tank from the drainage outlet at the bottom of the retention tank, which collects the treated rainwater. The utility model is provided with an overflow port at the top of the retention tank, and a second drainage pipe is connected to the overflow port of the retention tank, and the second drainage pipe is connected to the municipal rainwater pipe network. In this way, when the flow rate of rainwater flowing into the retention tank is large, the excess rainwater can be directly discharged into the municipal rainwater pipe network through the overflow port. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : A schematic structural diagram of the first water supply channel when blocked in Example 1 of the present invention.

[0014] Figure 2: A schematic structural diagram of the second water supply channel when blocked in Example 1 of the present invention.

[0015] Figure 3 : A plan view of a second embodiment of the present invention.

[0016] Figure 4 : The structural diagram of embodiment 2 of the present utility model.

[0017] Figure 5 : Force analysis diagram of the blocking baffle when the water flow rate into the water distribution plate in Example 1 of the present invention is small.

[0018] Figure 6 : Force analysis diagram of the blocking baffle when the blocking baffle rotates to the position corresponding to the water inlet in Example 1 of the present invention.

[0019] Figure 7 : Force analysis diagram of the blocking baffle when the blocking baffle rotates into the second water supply channel in Example 1 of the present invention.

[0020] In the figure: 1. Water distribution tray; 1-1. First water outlet; 1-2. Second water outlet; 1-3. Water inlet; 2. Rotating shaft; 3. Sealing baffle; 4. Push plate; 5. Fixed baffle; 6. Spring; 7. Limiting plate; 8. Retention tank; 8-1. Water inlet; 8-2. Drain outlet; 8-3. Overflow; 9. Drainage layer; 10. Filter layer; 11. Planting layer; 12. First drain pipe; 13. Second drain pipe; 14. Third drain pipe. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0022] Embodiment 1 is a diversion device having a water diversion tray 1, on which a first water outlet 1-1, a second water outlet 1-2, and a water inlet 1-3 are provided. The water inlet 1-3 is arranged between the first water outlet 1-1 and the second water outlet 1-2. A first water channel is formed between the water inlet 1-3 and the first water outlet 1-1, and a second water channel is formed between the water inlet 1-3 and the second water outlet 1-2. A blocking baffle 3 is provided in the first water channel, and a driving mechanism capable of driving the blocking baffle 3 to move into the second water channel is provided in the water diversion tray 1. In this way, water flows into the water diversion tray 1 through the water inlet 1-3. Under the action of the blocking baffle 3 in the first water channel, the water flows through the second water channel and is discharged from the second water outlet 1-2. After the blocking baffle 3 is moved into the second water channel by the driving mechanism, the water flows through the first water channel and is discharged from the first water outlet 1-1, thereby achieving the diversion effect of the water flow.

[0023] In this embodiment, the first water supply channel and the second water supply channel are both fan-shaped, and a rotating shaft 2 is provided in the water distribution plate 1. The rotating shaft 2 is arranged at the center position of the fan-shaped first water supply channel and the second water supply channel. The blocking baffle 3 is rotatably mounted on the rotating shaft 2, and the driving mechanism has a push plate 4 fixedly mounted on the blocking baffle 3, and the push plate 4 is arranged in the second water supply channel. When the water flow rate of the water flowing into the water diverter tray 1 through the water inlet 1-3 is large, the water will be discharged from the first water outlet 1-1 through the first water diverter tray 1, thereby realizing the diversion of water according to the water flow rate of the water flowing into the water diverter tray 1.

[0024] Furthermore, a fixed baffle 5 is provided within the second water transfer channel, with a spring 6 connected between the fixed baffle 5 and the push plate 4. This ensures that, when there is no water flowing within the water diversion tray 1, the spring 6 maintains the push plate 4 and the fixed baffle 5 in their initial positions, allowing the blocking baffle 3 to block the first water transfer channel. As water flow pushes the push plate 4, causing the blocking baffle 3 to rotate toward the second water transfer channel, the spring 6 accumulates force. When the water flow decreases, the spring 6 resets the push plate 4 and the blocking baffle 3. Furthermore, the spring 6 prevents the water flow from pushing the blocking baffle 3 toward the first water outlet 1-1 during low flow conditions, causing water to be discharged from the first water outlet 1-1.

[0025] Furthermore, a limit plate 7 is provided in the first water channel and the second water channel. Thus, when the blocking baffle 3 rotates between the first water channel and the second water channel, the limit plate 7 limits the rotation of the blocking baffle 3.

[0026] Example 2 is a bioretention facility with an initial rainwater discharge function. It comprises a retention tank 8 with an inlet 8-1 at its top. This inlet 8-1 is connected via an inlet pipe to the first outlet 1-1 of the water diversion tray 1. As a result, after rainwater enters the water diversion tray 1, the initial flow rate is relatively low and is discharged through the second outlet 1-2 of the water diversion tray 1. Later rainwater, with a higher flow rate, is discharged through the first outlet 1-1 and flows into the retention tank 8 via the inlet pipe.

[0027] In this embodiment, a drainage layer 9, a filter layer 10, and a planting layer 11 are arranged from bottom to top in the retention tank 8. A drain outlet 8-2 is provided at the bottom of the retention tank 8. A first drain pipe 12 is connected to the drain outlet 8-2. The first drain pipe 12 is connected to the clean water tank. Plants are planted on the planting layer 11. The plants can process rainwater and at the same time maintain the planting layer 11. The thickness of the planting layer 11 is 70 cm, the thickness of the filter layer 10 is 10 cm, and the thickness of the drainage layer 9 is 20 cm. In this way, after the rainwater flows into the retention tank 8 in the middle and late stages, it is processed by the plants on the planting layer 11 and filtered by the filter layer 10, and the rainwater accumulates in the drainage layer 9, and is finally discharged from the drain outlet 8-2 and discharged into the clean water tank, so that the treated rainwater in the clean water tank can be used later. The filler particle size in the drainage layer 9 is larger than that in the filter layer 10 and larger than that in the planting layer 11 , which can effectively prevent the planting layer 11 and the filter layer 10 from flowing out and clogging the drainage port 8 - 2 .

[0028] In this embodiment, an overflow port 8-3 is provided at the top of the retention tank 8. A second drain pipe 13 is connected to the overflow port 8-3 of the retention tank 8. The second drain pipe 13 is connected to the municipal rainwater network. Thus, when a large amount of rainwater flows into the retention tank 8, the excess rainwater is discharged into the municipal rainwater network through the overflow port 8-3 and the second drain pipe 13.

[0029] In this embodiment, a third drain pipe 14 is connected to the second outlet 1-2 of the water distribution tray 1. This drain pipe 14 is connected to the sewage network. This allows initial rainwater to be discharged into the sewage network through the second outlet 1-2 and the third drain pipe 14, facilitating the collection and treatment of pollutants in the initial rainwater.

[0030] In this embodiment, the water inlet 1-3, the first water outlet 1-1 and the second water outlet 1-2 of the water distribution plate 1 are arranged at the same level, so as to avoid the influence of gravity on the water distribution function.

[0031] Working principle of this utility model:

[0032] At the initial stage of rainfall, rainwater enters the water distribution plate 1 through the water inlet pipe. Initially, the rainwater flow rate is low but the pollutant concentration is high, so it flows out of the second water outlet 1-2, intercepted by the blocking baffle 3. As the rainfall enters the middle and late stages, the rainwater inflow rate increases, and the impact force exerted by the rainwater on the push plate 4 also increases. When it increases to a certain level, the spring 6 contracts, driving the blocking baffle 3 toward the second water transfer channel, thereby closing the second water outlet 1-2 and opening the first water outlet 1-1. The mid-term rainwater then flows out of the first water outlet 1-1, thus achieving the separation and collection of the mid-term rainwater.

[0033] When the rainwater flow rate gradually decreases in the later stage of rainfall, the impact force of the rainwater on the push plate 4 also gradually decreases, and the spring 6 gradually drives the push plate 4 to return to its original position, preparing for the next rainwater to enter.

[0034] The force analysis of the push plate 4 in the water distribution plate 1 when it is about to rotate is as follows Figure 3 As shown, the impact force generated by the amount of rainwater on the push plate 4 at this time is:

[0035] F1=0.5ρA1v1 2

[0036] Where: ρ——density of rainwater;

[0037] A1——the area of ​​impact on the push plate 4;

[0038] v1——the water flow velocity of the push plate 4 measured by a flow meter or other flow equipment.

[0039] The water pressure on the push plate 4 is composed of dynamic water pressure and static water pressure:

[0040] P1=0.5ρv1 2 +ρgh

[0041] Since the water distribution plate 1 is placed horizontally, the hydrostatic pressure is not considered, that is, the water flow pressure is:

[0042] P1=0.5ρv1 2

[0043] The initial tension of spring 6 when it is about to be compressed:

[0044]

[0045] Where: τi——initial stress,

[0046] G——shear elastic modulus;

[0047] c——spring index,

[0048] D——average diameter of spring 1 spiral, D1 spiral inner diameter, D2 spiral outer diameter;

[0049] Pi – initial tension;

[0050] d – diameter of the material.

[0051] Critical conditions for rotation:

[0052] P1+F1>Pi*cosα

[0053] Where: α is the angle between the direction of elastic force and the direction of water flow.

[0054] The conditions for maintaining the rotation state afterwards:

[0055] P1+F>F2*cosα

[0056] F2=KL

[0057]

[0058] Where: F is the impact force generated by the amount of water on the push plate 4;

[0059] F2——Elastic force generated by spring 6

[0060] K——spring coefficient of spring 6;

[0061] L is the spring deformation length at which spring 6 begins to deform, which changes with the magnitude of the impact force; G is the shear modulus of elasticity;

[0062] d——wire diameter;

[0063] n——effective number of circles;

[0064] D——center diameter.

[0065] Force analysis during rotation and reset Figure 4 , both the blocking baffle 3 and the push plate 4 generate water impact force:

[0066] F=F1+F3

[0067] F3=0.5ρA2v2 2

[0068] P2=0.5ρv2 2

[0069] Where: A2——cross-sectional area of ​​impact on blocking baffle 3;

[0070] v2: the water flow velocity of the blocking baffle 3 measured by a flow meter or other flow equipment.

[0071] P2 - the hydrostatic pressure on the blocking baffle 3.

[0072] The critical state during reset is as follows Figure 5 , the conditions are as follows:

[0073] F4=KL1

[0074] P1+P2+F <F4*cosα

[0075] Conditions for rotation during reset:

[0076] F <F2*cosα

[0077] Where: F - the water impact force at this time is provided only by the blocking baffle 3. When it starts to rotate and reset, it becomes provided by the blocking baffle 3 and the push plate 4 until the rainwater runoff stops and the initial state is restored. When facing the next rainfall, the water impact force begins to appear on the push plate 4.

[0078] L1 is the maximum distance that spring 6 in this device is compressed.

[0079] After the rainfall ends, the previously separated initial rainwater contains a higher concentration of pollutants and is collected and enters the sewage network. The separated middle and late rainwater enters the biological retention tank 8 for pollutant treatment. The middle and late rainwater passes through the planting layer 11, the filter layer 10 and the drainage layer 9 from top to bottom in turn, and can be reused after matrix interception, physical, chemical and biological treatment, thereby realizing water resource conservation management.

[0080] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A diversion device, characterized in that: The invention comprises a water distribution tray (1), on which a first water outlet (1-1), a second water outlet (1-2) and a water inlet (1-3) are arranged. The water inlet (1-3) is arranged between the first water outlet (1-1) and the second water outlet (1-2). A first water delivery channel is formed between the water inlet (1-3) and the first water outlet (1-1), and a second water delivery channel is formed between the water inlet (1-3) and the second water outlet (1-2). A blocking baffle (3) is provided in the first water delivery channel, and a driving mechanism capable of driving the blocking baffle (3) to move into the second water delivery channel is provided in the water distribution tray (1).

2. A flow diversion device according to claim 1, characterized in that: The first water delivery channel and the second water delivery channel are both fan-shaped. A rotating shaft (2) is provided in the water distribution plate (1). The rotating shaft (2) is arranged at the center position of the fan-shaped first water delivery channel and the second water delivery channel. The blocking baffle (3) is rotatably mounted on the rotating shaft (2). The driving mechanism has a push plate (4) fixedly mounted on the blocking baffle (3). The push plate (4) is arranged in the second water delivery channel.

3. A flow diversion device according to claim 2, characterized in that: A fixed baffle (5) is provided in the second water delivery channel, and a spring (6) is connected between the fixed baffle (5) and the push plate (4).

4. A flow diversion device according to claim 1, characterized in that: A limiting plate (7) is provided in the second water delivery channel.

5. A bioretention facility with an initial rainwater discharge function, comprising a diversion device according to any one of claims 1 to 4, characterized in that: The invention comprises a retention pond (8), wherein a drainage layer (9), a filter layer (10), and a planting layer (11) are arranged in sequence from bottom to top in the retention pond (8); a water inlet (8-1) is arranged at the top of the retention pond (8); the water inlet (8-1) is connected to a first water outlet (1-1) of a water distribution plate (1) through a water inlet pipe; and a drainage outlet (8-2) is arranged at the bottom of the retention pond (8).

6. The bioretention facility with the function of discarding initial rainwater according to claim 5, characterized in that: A first drainage pipe (12) is connected to the drainage port (8-2) of the retention tank (8), and the first drainage pipe (12) is connected to the clean water tank.

7. The bioretention facility with the function of discarding initial rainwater according to claim 5, characterized in that: An overflow port (8-3) is provided at the top of the retention tank (8), a second drainage pipe (13) is connected to the overflow port (8-3) of the retention tank (8), and the second drainage pipe (13) is connected to the municipal rainwater pipe network.

8. The bioretention facility with the function of discarding initial rainwater according to claim 5, characterized in that: A third drainage pipe (14) is connected to the second water outlet (1-2) of the water distribution tray (1), and the third drainage pipe (14) is connected to the sewage pipe network.

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