Diversion device and bioretention facility with initial rainwater discarding function

Abstract

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

[0002] Since urban rainwater runoff carries a large amount of pollutants such as organic matter, suspended solids, heavy metals and oils due to scouring in the early stage, it is one of the typical non-point source pollution, and the concentration of accumulated pollutants may exceed the regular influent water quality of the sewage treatment plant. If these pollutants converge with the rainwater collection system and are eventually discharged into the water body, they will pollute the receiving water body and seriously affect the environmental quality of the water body. If it enters the rainwater treatment and reuse system, the treatment process will be complicated and the treatment cost will increase. Therefore, it is necessary to abandon the initial rainwater and enter the sewage network. However, in the middle and late stages of rainfall, the amount of rainwater is large and the concentration of pollutants is low. It can be collected and treated for reuse, thereby realizing the resource utilization of rainwater and alleviating the water resource crisis. Summary of the invention

[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 the function of discarding initial rainwater.

[0004] The technical solution adopted by the present invention is: a diversion device, having a water diversion plate, a first water outlet, a second water outlet and a water inlet are arranged on the water diversion plate, the water inlet is arranged between the first water outlet and the second water outlet, a first water transfer channel is between the water inlet and the first water outlet, a second water transfer channel is between the water inlet and the second water outlet, a blocking baffle is arranged in the first water transfer channel, and a driving mechanism capable of driving the blocking baffle to move into the second water transfer channel is arranged in the water diversion plate. In this way, when the blocking baffle is arranged in the first water transfer channel, the blocking baffle blocks the first water transfer channel, and the liquid entering the water diversion plate from the water inlet can only flow out from the second water transfer channel; when the driving mechanism drives the blocking baffle to move into the second water transfer channel, the blocking baffle can block the second water transfer channel, and the liquid entering the water diversion plate from the water inlet can only flow out from the first water transfer channel.

[0005] The first water conveying channel and the second water conveying channel are both fan-shaped. A rotating shaft is provided in the water dividing plate, and the rotating shaft is arranged at the center position of the fan-shaped first water conveying channel and the second water conveying 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 conveying channel.

[0006] A fixed baffle is arranged 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 conveying channel and the second water conveying channel.

[0008] A biological retention facility with an initial rainwater discharge function comprises the above-mentioned diversion device, and has a retention pool, in which a drainage layer, a filtration layer, and a planting layer are arranged from bottom to top, a water inlet is arranged at the top of the retention pool, the water inlet is connected to the first water outlet of the water diversion tray through an inlet pipe, and a drainage outlet is arranged 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 connected to the clean water tank.

[0010] An overflow port is arranged 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 arranges a fan-shaped first water delivery channel and a second water delivery channel on the water distribution plate, the first water delivery channel and the second water delivery channel are connected at the same water inlet, and a blocking baffle arranged in the first water delivery channel is arranged in the water distribution plate, the blocking baffle can rotate along the center of the fan-shaped first 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 distribution plate through the water inlet, the initial rainwater flow The amount of rainwater is small, and 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 the rainwater in the middle and late stages pushes the push plate to rotate toward the second water outlet when flowing through the second water transfer channel, 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, thereby preventing the blocking baffle from rotating toward the first water transfer channel and blocking the first water transfer channel. The present invention provides a fixed baffle in the water diversion plate, and connects a spring between the fixed baffle and the push plate. When the water flow pushes When the push plate is moved and drives the blocking baffle to rotate toward the second water transfer channel, the spring is in a state of storing force. When the flow rate of rainwater flowing into the water diversion plate becomes smaller, the push plate and the blocking baffle can be driven to rotate toward the first water transfer channel under the resetting action of the spring, and the first water transfer channel is blocked by the blocking baffle to prevent rainwater from directly flowing into the first water transfer channel when it flows into the water diversion plate next time. In this way, rainwater is discharged from the second water outlet when the water volume is small in the initial stage, and is discharged from the first water outlet when the water volume is large in the middle and late stages. The present invention connects the first water outlet of the water diversion plate to the water inlet at the top of the retention tank through the water inlet pipe, so that rainwater in the middle and late stages can be discharged into the retention tank. A drainage layer, a filtration layer, and a planting layer are arranged in the retention tank from bottom to top. A first drainage pipe is connected to the drainage port 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 port at the bottom of the retention tank, thereby collecting the treated rainwater. The present invention provides 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 transfer channel when blocked in the first embodiment of the present invention.

[0014] Figure 2 : A schematic diagram of the structure when the second water transfer channel is blocked in the first embodiment of the present invention.

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

[0016] Figure 4 : A schematic structural diagram of the second embodiment of the present invention.

[0017] Figure 5 : Force analysis diagram of the blocking baffle when the water flow rate flowing into the water diversion plate in the first embodiment 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 transfer channel in Example 1 of the present invention.

[0020] In the figure: 1. water distribution plate; 1-1. first water outlet; 1-2. second water outlet; 1-3. water inlet; 2. rotating shaft; 3. blocking baffle; 4. push plate; 5. fixed baffle; 6. spring; 7. limit plate; 8. retention tank; 8-1. water inlet; 8-2. drain outlet; 8-3. overflow; 9. drainage layer; 10. filtration 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 by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0022] Embodiment 1 is a diversion device, which has a water diversion plate 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, between the water inlet 1-3 and the first water outlet 1-1 is a first water transfer channel, between the water inlet 1-3 and the second water outlet 1-2 is a second water transfer channel, a blocking baffle 3 is arranged in the first water transfer channel, and a driving mechanism capable of driving the blocking baffle 3 to move into the second water transfer channel is arranged in the water diversion plate 1. In this way, water flows into the water diversion plate 1 through the water inlet 1-3, and under the action of the blocking baffle 3 in the first water transfer channel, the water flows through the second water transfer channel and is discharged from the second water outlet 1-2, and after the blocking baffle 3 is moved to the second water transfer channel by the driving mechanism, the water flows through the first water transfer channel and is discharged from the first water outlet 1-1, thereby realizing the diversion of water flow.

[0023] In this embodiment, the first water transfer channel and the second water transfer channel are both fan-shaped, and a rotating shaft 2 is provided in the water distribution plate 1, and the rotating shaft 2 is arranged at the center position of the fan-shaped first water transfer channel and the second water transfer 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 transfer channel. In this way, when the flow rate of water flowing into the water diverter tray 1 through the water inlet 1-3 is small, the blocking baffle 3 is arranged in the first water transfer channel, and the water flows into the second water transfer channel and is discharged from the second water transfer channel, and the water with a small flow rate cannot push the push plate 4 to drive the blocking baffle 3 to rotate toward the second water transfer channel; when the flow rate of water flowing into the water diverter tray 1 through the water inlet 1-3 increases, the water flows to the second water transfer channel and pushes the push plate 4 to drive the blocking baffle 3 to rotate toward the second water transfer channel. When the blocking baffle 3 rotates to the corresponding position of the water inlet 1-3, the water flowing into the water diverter tray 1 from the water inlet 1-3 will flow to the first water transfer channel. At the same time, the water will continue to push the blocking baffle 3 to rotate toward the second water transfer channel to block the second water transfer channel. In this way, when the flow rate of water flowing into the water diverter tray 1 is large, the water will be discharged from the first water outlet 1-1 through the first water transfer channel, thereby realizing the diversion of water according to the flow rate of water flowing into the water diverter tray 1.

[0024] Furthermore, a fixed baffle 5 is provided in the second water transfer channel, and a spring 6 is connected between the fixed baffle 5 and the push plate 4. In this way, when there is no water flow in the water diversion plate 1, the spring 6 can ensure that the push plate 4 and the fixed baffle 5 are in the initial state and the blocking baffle 3 blocks the first water transfer channel. When the water flow pushes the push plate 4 to drive the blocking baffle 3 to rotate toward the second water transfer channel, the spring 6 is in a force storage state. When the water flow rate decreases, the spring 6 can drive the push plate 4 and the blocking baffle 3 to reset. And under the action of the spring 6, it can be prevented that the water flow pushes the blocking baffle 3 to rotate toward the first water outlet 1-1 when the flow rate is small, so that the water flow is discharged from the first water outlet 1-1.

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

[0026] Embodiment 2 is a biological retention facility with an initial rainwater discharge function, which has a retention pool 8, and a water inlet 8-1 is arranged on the top of the retention pool 8, and the water inlet 8-1 is connected to the first water outlet 1-1 of the water diversion plate 1 through a water inlet pipe. In this way, after the rainwater flows into the water diversion plate 1, the initial rainwater will be discharged from the second water outlet 1-2 of the water diversion plate 1 because of the small flow rate, and the mid- and late-stage rainwater will be discharged from the first water outlet 1-1 and flow into the retention pool 8 through the water 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 pool 8. A drainage port 8-2 is arranged at the bottom of the retention pool 8. A first drainage pipe 12 is connected to the drainage port 8-2. The first drainage pipe 12 is connected to the clean water pool. Plants are planted on the planting layer 11. The plants can process rainwater and 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 pool 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 drainage port 8-2 and discharged into the clean water pool, so as to facilitate the subsequent use of the treated rainwater in the clean water pool. 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 leaking 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, and a second drain pipe 13 is connected to the overflow port 8-3 of the retention tank 8, and the second drain pipe 13 is connected to the municipal rainwater pipe network. In this way, when a large amount of rainwater flows into the retention tank 8, the excess rainwater will be discharged into the municipal rainwater pipe 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 water outlet 1-2 of the water distribution plate 1, and the third drain pipe 14 is connected to the sewage pipe network. In this way, the initial rainwater is discharged into the sewage pipe network through the second water outlet 1-2 and the third drain pipe 14, which is convenient for collecting and treating the initial rainwater carrying pollutants.

[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 effect.

[0031] Working principle of the present invention:

[0032] At the beginning of rainfall, rainwater enters the water distribution plate 1 through the water inlet pipe. The initial rainwater flow rate is small and the pollutant concentration is high. It flows out from the second water outlet 1-2 through the interception of the blocking baffle 3. When the rainfall enters the middle and late stages, when the rainwater inflow rate increases, the impact force of the rainwater on the push plate 4 also increases. When it increases to a certain extent, the spring 6 contracts and drives the blocking baffle 3 to move toward the second water delivery channel, thereby closing the second water outlet 1-2 and opening the first water outlet 1-1. The mid-term rainwater flows out from the first water outlet 1-1, thereby realizing 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 impact area of ​​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 flow 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, D——average diameter of spring 1 spiral, D1 spiral inner diameter, D2 spiral outer diameter;

[0048] Pi – initial tension;

[0049] d – diameter of the material.

[0050] Critical conditions for rotation:

[0051] P1+F1>Pi*cosα

[0052] Where: α is the angle between the direction of elastic force and the direction of water flow.

[0053] The conditions for maintaining the rotation state afterwards:

[0054] P1+F>F2*cosα

[0055] F2=KL

[0056]

[0057] Where: F——impact force generated by water on push plate 4;

[0058] F2——Elastic force generated by spring 6

[0059] K——spring coefficient of spring 6;

[0060] L is the spring deformation length at which the spring 6 begins to deform, which changes with the magnitude of the impact force; G is the shear elastic modulus;

[0061] d——wire diameter;

[0062] n——effective number of turns;

[0063] D——center diameter.

[0064] Force analysis during rotation and resetting Figure 4 , both the blocking baffle 3 and the push plate 4 generate water impact force:

[0065] F=F1+F3

[0066] F3=0.5ρA2v2 2

[0067] P2=0.5ρv2 2

[0068] Where: A2——the cross-sectional area of ​​the impact on the blocking baffle 3;

[0069] v2: the water flow velocity of the blocking baffle 3 measured by a flow meter or other flow equipment.

[0070] P2——The hydrostatic pressure on the blocking baffle 3.

[0071] The critical state during reset is as follows Figure 5 , the conditions are as follows:

[0072] F4=KL1

[0073] P1+P2+F <F4*cosα

[0074] Conditions for rotation during reset:

[0075] F <F2*cosα

[0076] Wherein: F——the water impact force at this time is only provided by the blocking baffle 3, and 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 returns to the initial state. When facing the next rainfall, water impact force begins to appear on the push plate 4.

[0077] L1 is the maximum distance that spring 6 is compressed in this device.

[0078] 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 filtration layer 10 and the drainage layer 9 from top to bottom, and can be reused after matrix interception, physical and chemical and biological treatment, thereby realizing water resource conservation management.

[0079] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flow diversion device, characterized in that: The invention comprises a water distribution plate (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), 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 plate (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 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 arranged 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 arranged 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 provides a retention pond (8), wherein a drainage layer (9), a filtration layer (10) and a planting layer (11) are arranged in the retention pond (8) from bottom to top, 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. A bioretention facility with an initial rainwater discharge function 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 initial rainwater discarding function 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 initial rainwater discarding function 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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