A filtering system

Abstract

A filtering system, comprising a filtering pool, a sedimentation tank, a diversion well and a water collection pipe network. The water collection pipe network is directly or indirectly connected to the diversion well. The diversion well is connected to the sedimentation tank through an electric control valve. The diversion well is connected to a waste flow pipe through an electric control valve. The sedimentation tank is connected to the filtering pool. The diversion well is provided with a detection channel. The detection channel includes an inlet, an outlet, a first channel and a second channel. Both ends of the second channel are respectively connected to the inlet and the outlet. At least a partial area of the first channel and the second channel is separated by a filter screen near the inlet. The first channel is directly or indirectly connected to the outlet. The first channel is provided with a photoelectric sensor capable of judging the impurity content of rainwater through the light transmittance and scattering effect of rainwater. When the impurity content of rainwater is relatively high, the electric control valve connected to the waste flow pipe is opened. When the impurity content of rainwater is relatively low, the electric control valve connected to the sedimentation tank is opened. In this way, the utilization rate of rainwater can be improved, the maintenance interval time can be extended, and the maintenance cost can be reduced.

Description

Technical Field

[0001] The present invention belongs to the field of water treatment, and particularly relates to a filtration system. Background Art

[0002] In the case of heavy rain, waterlogging is likely to occur in many low-lying areas. Therefore, more and more cities are building rainwater collection and filtration systems. For factories, collecting and filtering rainwater can recycle water resources, greatly improving the utilization rate of rainwater, and increasing the water absorption function of the city can reduce waterlogging.

[0003] However, the rainwater collected at the beginning of each rain will carry a lot of impurities, and the filtration and precipitation are relatively complex. Generally, direct flow rejection is selected, that is, the water is discharged into the sewage pipe and collected in the sewage treatment station for unified treatment. After that, the impurities in the rainwater will be less for a period of time, but how to judge the content of rainwater impurities is a major problem.

[0004] Chinese Patent Publication No. "CN114396108B", with the patent name "Sponge City Rainwater Collection and Purification Treatment System", discloses a rainwater collection and filtration system. Although it has designed a flow rejection channel, it decides whether to reject the flow according to the amount of rainfall. If it rains continuously and lightly for a long time, although there is a lot of rainwater, it cannot be collected.

[0005] Chinese Patent Publication No. "CN112814122A", with the patent name "An Ecological Rainwater Regulation and Storage System for Sponge City", discloses a collection system. Although it has also designed a flow rejection channel, it also decides whether to reject the flow according to the amount of rainfall. If it rains continuously and lightly for a long time, although there is a lot of rainwater, it cannot be collected. For the existing technologies, they all decide whether to reject the flow based on the amount of rainfall. For factories, the utilization rate of rainwater is low, and the cost of building a large-scale rainwater filter is high. If it cannot bring greater economic benefits, it is very difficult to be widely promoted and used in factories.

[0006] Chinese Patent Publication No. "CN107217723B", with the patent name "A Runoff Rainwater Quality Interception Device and Method Based on Light Sensing Technology", discloses a diversion device that uses a photoelectric sensor to detect the turbidity of rainwater to achieve the diversion of rainwater. However, its detection structure is complex, the cost is high, and the water pump needs to be continuously started during detection. When the content of fine impurities such as sediment in the rainwater is relatively high, the water pump is easily blocked or damaged and cannot work normally, and the detection stability is poor. Summary of the Invention

[0007] Aiming at the above-mentioned existing technologies, the purpose of the present invention is to provide a filtration system with higher and more stable rainwater collection efficiency.

[0008] The technical solution of the present invention is realized as follows: A filtering system includes a filtering pool, a sedimentation tank, a diversion well, and a collecting pipe network. The collecting pipe network is directly or indirectly connected to the diversion well. The diversion well is connected to the sedimentation tank through an electric control valve. The diversion well is connected to a waste flow pipe through an electric control valve. The sedimentation tank is connected to the filtering pool. The diversion well is provided with a detection channel. The detection channel includes an inlet, an outlet, a first channel, and a second channel. Both ends of the second channel are respectively connected to the inlet and the outlet. At least part of the first channel and the second channel are separated by a filter screen near the inlet. The first channel is directly or indirectly connected to the outlet. The first channel is provided with a photoelectric sensor capable of judging the impurity content of rainwater through the light transmittance and scattering effect of rainwater. When the impurity content of rainwater is relatively high, the electric control valve connected to the waste flow pipe is opened. When the impurity content of rainwater is relatively low, the electric control valve connected to the sedimentation tank is opened.

[0009] The beneficial effects of such a design are as follows: The impurity content of rainwater can be judged according to the light transmittance of rainwater. By setting a filter screen in the diversion well, the photoelectric sensor can be directly arranged in the diversion well, which simplifies the installation and use of the photoelectric sensor, improves the stability of detection. The filter screen can be disassembled, cleaned or replaced. Maintaining the water flow velocity in the first channel can improve the accuracy of rainwater detection and keep it consistent with the actual water flow situation in a timely manner. Without a filter screen, impurities in the water have a great impact on the photoelectric sensor. If the rainwater in the entire diversion well is filtered, the resistance is relatively large, or in other words, to meet the use requirements during heavy rain, a very large diversion well needs to be designed. Local sampling detection can reduce the size of the diversion well. Sedimentation and filtration are implemented through subsequent devices, so the diversion efficiency is higher. Once the impurities in the rainwater are less and it has utilization value, the water flow direction can be changed through the electric control valve. In this way, the utilization rate of rainwater can be improved, the maintenance interval time can be extended, and the maintenance cost can be reduced.

[0010] Further, the transmitter and receiver of the photoelectric sensor are arranged on the same side of the first channel and judge the turbidity degree of rainwater through the light scattering effect. Large particulate impurities are easy to remove, while fine particles forming turbid rainwater are more difficult to handle. The scattering effect of turbid liquid is obvious. Therefore, by detecting the scattered light, the turbidity degree of rainwater can be determined. No scattering occurs when there is no water, and different degrees of scattering may occur when there is water depending on the situation.

[0011] Further, the transmitter and receiver of the photoelectric sensor are arranged on both sides of the first channel. The receiver has two, which are respectively located at the light refraction position and the light direct irradiation position of the transmitter. In this way, it can be judged in advance by the receiver that there is rainwater. Secondly, the turbidity degree of rainwater can be judged according to the intensity of the received light. Different electric control valves can be opened according to specific situations to connect different structures.

[0012] Furthermore, the cross-section of the first channel is smaller than that of the second channel. The second channel is provided with a flow guide plate that can guide rainwater to flow towards the first channel, such that the maximum water flow velocity in the first channel is greater than that in the second channel. The photoelectric sensor is arranged at the position with a faster water flow velocity.

[0013] Furthermore, the first channel is provided with an arc-shaped and transparent flow channel plate. The longitudinal depth of the first channel is greater than that of the second channel. The photoelectric sensor is isolated from the rainwater by the flow channel plate. The arc-shaped structure can reduce the flow resistance. The design of the flow channel plate can better protect the photoelectric sensor and improve the stability of the system. The flow channel plate is designed as a detachable structure for convenient cleaning and maintenance.

[0014] Furthermore, the first channel is arranged below the second channel such that rainwater first passes through the first channel. The outlet of the detection channel is lower than the first channel, which can avoid water accumulation in the first channel. The absence of water accumulation in the first channel can prevent the water accumulation from rotting and polluting the transparent flow channel plate after the rain stops, reducing the light transmittance of the flow channel plate. In this way, setting the photoelectric sensor in the first channel can accurately and timely feedback the turbidity of the rainwater.

[0015] Furthermore, the filtering system is provided with a silt trap. The silt trap is provided with a filter screen to separate larger debris from the rainwater. The collecting pipe network is connected to the silt trap. The collecting pipe network is higher than the outlet of the silt trap. The outlet of the silt trap is higher than the outlet of the shunt well. The outlet of the shunt well is higher than the outlet of the sedimentation tank. The outlet of the sedimentation tank is higher than the filter tank and is connected to the filter tank through a siphon. The setting of the silt trap can prevent debris from blocking other pipes or positions. The setting of the height difference enables the water to move directionally without external force during the flowing process.

[0016] Furthermore, the sedimentation tank is provided with multiple sedimentation wells and a collecting well. The multiple sedimentation wells are connected in sequence such that rainwater reaches the collecting well after passing through the multiple sedimentation wells. The collecting well is connected to the filter tank. The sedimentation well is provided with a photoelectric sensor, which can detect the turbidity of the water in the sedimentation well. The sedimentation well is provided with a channel directly connected to the collecting well and is controlled by the detection result of the photoelectric sensor. When the turbidity of the rainwater in the sedimentation well is relatively low, it is directly connected to the collecting well. The multiple sedimentation wells can ensure a larger water storage capacity and better sedimentation effect. When the rainwater impurities are relatively few and meet the requirements detected by the photoelectric sensor, the electric control valve of the direct connection channel can be opened, resulting in smaller flow resistance, faster flow velocity, and higher filtration efficiency.

[0017] Furthermore, the sedimentation tank is made of an impermeable material to form a water storage container. The sedimentation wells and the collecting well are made of permeable bricks and can have a water filtering function. In this way, the sedimentation tank has a certain filtering function, can achieve preliminary filtration of rainwater, make fewer debris enter the filter tank, and can reduce the maintenance of the filter tank.

[0018] Further, the water collection pipe network includes a ground pipe network and a roof pipe network. The roof pipe network is directly connected to the sedimentation tank, and the ground pipe network is sequentially connected to the sewage interception well, the flow diversion well, and the sedimentation tank. The amount of debris in different pipe networks is different, and separate collection and treatment can improve the treatment efficiency. The roof pipe network mainly filters some debris, and there may be a lot of mud in the ground pipe network, so sedimentation is required. Of course, if it is too turbid, it can also be directly discharged.

[0019] Further, inside the filtration tank, a plurality of hexagonal filter wells are built with permeable bricks to form a honeycomb structure. The filtration tank is provided with multiple stages of filtration and is equipped with a greening pump and a production pump. The greening has a lower requirement for water purity and can use the preliminarily filtered rainwater for irrigation. The production water has higher requirements, so it must go through multiple stages of filtration and be purified by microorganisms to reach the required water quality before being transported to the production line by the production pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional schematic diagram of a filtration system according to the present invention;

[0021] Figure 2 is Figure 1 an enlarged schematic diagram at position A in

[0022] Figure 3 is a top view schematic diagram of a filtration system according to the present invention;

[0023] Figure 4 is Figure 3 an enlarged schematic diagram at position B in

[0024] Figure 5 is an enlarged schematic diagram at position B in another embodiment Figure 3 ;

[0025] Figure 6 is a schematic diagram of a detection channel in another embodiment;

[0026] Figure 7 is Figure 3 a half-sectional schematic diagram at position A-A in DETAILED DESCRIPTION OF THE INVENTION

[0027] As needed, detailed embodiments of the present invention are disclosed herein, but it should be understood that the disclosed embodiments are only illustrative of the present invention, and the present invention can be implemented in different and alternative forms. The drawings are not necessarily drawn to scale, and some features may be exaggerated or reduced to show the details of specific components. Therefore, the specific structures and functional details disclosed herein should not be construed as having a limiting meaning, but only as a representative basis for teaching those skilled in the art to implement the present invention differently. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0028] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, a filtering system includes a filtering tank 1, a sedimentation tank 2, a diversion well 3 and a collecting pipe network 4. The collecting pipe network 4 is directly or indirectly connected to the diversion well 3. The diversion well 3 is connected to the sedimentation tank 2 through an electric control valve 5. The diversion well 3 is connected to a waste flow pipe 6 through the electric control valve 5. The sedimentation tank 2 is connected to the filtering tank 1. The diversion well 3 is provided with a detection channel 31. The detection channel 31 includes an inlet 32, an outlet 33, a first channel 34 and a second channel 35. Both ends of the second channel 35 are respectively connected to the inlet 32 and the outlet 33. At least a partial area of the first channel 34 and the second channel 35 is separated by a filter screen 36 near the inlet 32. The first channel 34 is directly or indirectly connected to the outlet 33. The first channel 34 is provided with a photoelectric sensor 7 which can judge the impurity content of rainwater through the light transmittance and scattering effect of rainwater. When the impurity content of rainwater is relatively high, the rainwater is more turbid. At this time, the electric control valve 5 connected to the waste flow pipe 6 is opened. When the impurity content of rainwater is relatively low, the rainwater is relatively clear and the electric control valve 5 connected to the sedimentation tank 2 is opened. The electric control valve 5 can be a large solenoid valve or a gas valve structure controlled by a motor, or a gate structure opened by a hydraulic structure but controlled by an electric circuit. The electric control valve 5 is designed as a three-way structure and can be switched from the connected state between the diversion well 3 and the sedimentation tank 2 to the connected state between the diversion well 3 and the waste flow pipe 6, which can simplify the structure and reduce the cost. The photoelectric sensor 7 includes a transmitter 71, a receiver 72 and a detection circuit. The transmitter 71 is a semiconductor light source, which can be a light-emitting diode, a laser diode or an infrared emitting diode. The receiver 72 can be composed of a photodiode, a phototransistor and a photovoltaic cell. The detection circuit is electrically connected to the receiver 72 and feeds back the signal of the receiver 72 to the control circuit to implement corresponding control.

[0029] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the transmitter 71 and the receiver 72 of the photoelectric sensor 7 are arranged on the same side of the first channel 34 and judge the turbidity degree of rainwater through the light scattering effect. The dotted line is the light scattering path 73.

[0030] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, the transmitter 71 and the receiver 72 of the photoelectric sensor 7 are arranged on both sides of the first channel 34. The receiver 72 has two, namely the first receiver 74 and the second receiver 75, which are respectively located at the light refraction position and the direct light position of the transmitter 71. The dotted lines in the figure are the schematic positions of the light paths. The upper part is the direct light irradiation position, that is, the direct light path 76 in the waterless state, and the lower dotted line is the light refraction path 77 in the water state.

[0031] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the cross-section of the first channel 34 is smaller than that of the second channel 35. The second channel 35 is provided with a flow guide plate 37 that can guide rainwater to flow towards the first channel 34, so that the maximum water flow speed in the first channel 34 is greater than the maximum water flow speed in the second channel 35. The photoelectric sensor 7 is arranged at a position with a faster water flow speed, that is, near the outlet 33 or other narrower positions. A rib plate is arranged behind the flow guide plate 37 to ensure strength.

[0032] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the first channel 34 is provided with an arc-shaped and transparent flow channel plate 38. The longitudinal depth of the first channel 34 is greater than the longitudinal depth of the second channel 35. The photoelectric sensor 7 is isolated from the rainwater through the flow channel plate 38.

[0033] As Figure 5 shown, the first channel 34 is arranged below the second channel 35 so that rainwater preferentially passes through the first channel 34. A filter screen 36 is arranged between the first channel 34 and the second channel 35. Transparent and detachable detection plates 39 are arranged on both sides of the first channel 34. The photoelectric sensor 7 is isolated from the first channel 34 through the detection plates 39, or a waterproof photoelectric sensor 7 can also be directly arranged on both sides of the first channel 34.

[0034] As Figure 1 , Figure 3 and Figure 7 shown, the filtration system is provided with a silt interception well 8. The silt interception well 8 is provided with a filter screen 36 to separate larger debris from the rainwater. The water collection pipe network 4 is communicated with the silt interception well 8. The water collection pipe network 4 is higher than the water outlet of the silt interception well 8. The water outlet of the silt interception well 8 is higher than the water outlet of the diversion well 3. The water outlet of the diversion well 3 is higher than the water outlet of the sedimentation tank 2. The water outlet of the sedimentation tank 2 is higher than the filtration tank 1 and is communicated with the filtration tank 1 through a siphon 9.

[0035] As Figure 1 , Figure 3 and Figure 7As shown in the figure, the sedimentation tank 2 is provided with a plurality of sedimentation wells 21 and a collecting well 22. The plurality of sedimentation wells 21 are connected in sequence so that rainwater reaches the collecting well 22 after passing through the plurality of sedimentation wells 21. The collecting well 22 is connected to the filtration tank 1 through a siphon tube 9. The sedimentation well 21 is provided with a photoelectric sensor 7 which can detect the turbidity of the water in the sedimentation well 21. The sedimentation well 21 is provided with a channel 23 directly connected to the collecting well and is controlled by the detection result of the photoelectric sensor 7, and is directly connected to the collecting well 22 when the turbidity of the rainwater in the sedimentation well 21 is relatively low.

[0036] As Figure 6 shown, the photoelectric sensors 7 of the sedimentation wells 21 can be arranged opposite to each other or on the same side. When arranged on the same side, the principle of light scattering needs to be utilized. When arranged opposite to each other, the intensity of transmitted light is mainly detected to judge the turbidity of the well water. When the water flow meets the standard, the water flow can be controlled by the electric control valve 5 to directly enter the collecting well 22. If the well water is relatively turbid, as the water level rises, the well water can enter the overflow pipe 24 and reach the next sedimentation well 21. The inlet 32 of the overflow pipe 24 is higher than the outlet 33, so that it is convenient for the relatively clear well water in the upper layer to enter the next sedimentation well 21 and can enter the collecting well 22 after meeting the requirements.

[0037] As Figure 1 、 Figure 3 and Figure 7 shown, the sedimentation tank 2 is made of impermeable material to form a water storage container. The sedimentation wells 21 and the collecting well 22 are made of permeable bricks and can have a water filtering function. The well water in the sedimentation well 21 can slowly penetrate into the collecting well 22.

[0038] As Figure 1 、 Figure 3 and Figure 7 shown, the water collection pipe network 4 includes a ground pipe network 41 and a roof pipe network 42. The roof pipe network 42 is directly connected to the sedimentation tank 2. The ground pipe network 41 is sequentially connected to the sewage intercepting well 8, the diversion well 3 and the sedimentation tank 2.

[0039] As Figure 1 、 Figure 3 and Figure 7 shown, the interior of the filtration tank 1 is built with a plurality of hexagonal filter wells 11 made of permeable bricks to form a honeycomb structure. The filtration tank 1 is provided with multiple stages of filtration and is provided with a greening pump and a production pump. The greening pump supplies water to the greening pipeline 12, and the production pump supplies water to the production pipeline 13.

Claims

1. A filtration system, comprising a filter tank (1), a sedimentation tank (2), a diversion well (3) and a water collection network (4), wherein the water collection network (4) is directly or indirectly connected to the diversion well (3), the diversion well (3) is connected to the sedimentation tank (2) through an electric control valve (5), the diversion well (3) is connected to a discarding pipe (6) through the electric control valve (5), and the sedimentation tank (2) is connected to the filter tank (1), characterized in that: The diversion well (3) is provided with a detection channel (31), the detection channel (31) comprises an inlet (32), an outlet (33), a first channel (34) and a second channel (35), the cross section of the first channel (34) is smaller than that of the second channel (35), the two ends of the second channel (35) are respectively connected to the inlet (32) and the outlet (33), the first channel (34) and the second channel (35) are separated by a filter screen (36) at least in part near the inlet (32), the first channel (34) is directly or indirectly connected to the outlet (33), the first channel (34) is provided with a photoelectric sensor (7) capable of judging the impurity content of rainwater by the light transmittance and scattering effect of rainwater, when the impurity content of rainwater is high, the electric control valve (5) connected to the abandoned flow pipe (6) is opened, and when the impurity content of rainwater is low, the electric control valve (5) connected to the sedimentation tank (2) is opened.

2. The filtration system according to claim 1, characterized in that: The transmitter (71) and the receiver (72) of the photoelectric sensor (7) are arranged on the same side of the first channel (34) and judge the turbidity of rainwater through the light scattering effect.

3. The filtration system according to claim 1, characterized in that: The transmitter (71) and the receiver (72) of the photoelectric sensor (7) are arranged on both sides of the first channel (34), and the receiver (72) of the photoelectric sensor (7) is provided with two receivers respectively located at the light refraction position and the light directing position of the transmitter (71).

4. The filtration system according to claim 1, characterized in that: The second channel (35) is provided with a guide plate (37) capable of guiding rainwater to flow toward the first channel (34) so ​​that the maximum water flow velocity in the first channel (34) is greater than the maximum water flow velocity in the second channel (35), and the photoelectric sensor (7) is arranged at a position where the water flow velocity is faster.

5. The filtration system according to claim 4, characterized in that: The first channel (34) is provided with an arc-shaped and transparent flow channel plate (38); the longitudinal depth of the first channel (34) is greater than the longitudinal depth of the second channel (35); and the photoelectric sensor (7) is isolated from rainwater by the flow channel plate (38).

6. The filtration system according to claim 4, characterized in that: The first channel (34) is arranged below the second channel (35) so that rainwater passes through the first channel (34) first.

7. The filtration system according to claim 5 or 6, characterized in that: The filtration system is provided with a sewage interception well (8), and the sewage interception well (8) is provided with a filter net to separate larger debris from rainwater. The water collection pipe network (4) is connected to the sewage interception well (8), and the water collection pipe network (4) is higher than the water outlet of the sewage interception well (8). The water outlet of the sewage interception well (8) is higher than the water outlet of the diversion well (3), and the water outlet of the diversion well (3) is higher than the water outlet of the sedimentation tank (2). The water outlet of the sedimentation tank (2) is higher than the filter tank (1) and is connected to the filter tank (1) through a siphon (9).

8. The filtration system according to claim 7, characterized in that: The sedimentation tank (2) is provided with a plurality of sedimentation wells (21) and a collection well (22). The plurality of sedimentation wells (21) are connected in sequence so that rainwater reaches the collection well (22) after passing through the plurality of sedimentation wells (21). The collection well (22) is connected with the filtering tank (1). The sedimentation well (21) is provided with a photoelectric sensor (7). The photoelectric sensor (7) can detect the turbidity of water in the sedimentation well (21). The sedimentation well (21) is provided with a channel (23) directly connected to the collection well (22) and is controlled by the detection result of the photoelectric sensor (7). When the turbidity of rainwater in the sedimentation well (21) is low, the channel is directly connected to the collection well (22). The sedimentation tank (2) is made of impermeable material to form a water storage container. The sedimentation well (21) and the collection well (22) are made of permeable bricks and can have a water filtering function.

9. The filtration system according to claim 8, characterized in that: The water collection network (4) comprises a ground network (41) and a roof network (42); the roof network (42) is directly connected to the sedimentation tank (2); and the ground network (41) is connected in sequence to the sewage interception well (8), the diversion well (3) and the sedimentation tank (2).

10. The filtration system according to claim 9, characterized in that: The filter pool (1) has a plurality of hexagonal water filtration wells (11) formed by piling permeable bricks to form a honeycomb structure. The filter pool (1) is provided with multi-stage filtration and is provided with a greening pump and a production pump.

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