Roof rainwater collecting system

Abstract

The utility model relates to the technical field of rainwater collection, in particular to a roof rainwater collection system which comprises a rainwater collection unit, a turbidity detection unit, a water storage unit and a filtering unit which are sequentially connected. The turbidity detection unit further comprises a plurality of stirring devices located in the detection cavity, a turbidity sensor, a flow abandoning valve and a water inlet valve, the flow abandoning valve is arranged at the flow abandoning channel, the water inlet valve is arranged at a pipeline between the turbidity detection unit and the water storage unit, the turbidity sensor is electrically connected with the flow abandoning valve and the water inlet valve, and the stirring devices are used for stirring rainwater. The stirring device is arranged in the detection cavity, so that the turbidity of the rainwater in the detection cavity becomes uniform, the turbidity detection accuracy is improved, and the situation that the rainwater with the excessive turbidity is discharged or the rainwater with the excessive turbidity is fed into the water storage unit to affect the quality of used water due to deviation of a detection result caused by precipitation of the rainwater is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to rainwater collection technical field, more specifically, relate to a roof rainwater collection system. BACKGROUND

[0002] In modern society, water resource management and sustainable utilization become important issues, traditional water supply system faces the challenge of high energy consumption and operating cost, therefore rainwater collection system as a kind of alternative water resource utilization method gradually attracts attention, these systems collect and utilize precipitation, convert rainwater into renewable water resources for multiple purposes, including irrigation, flushing and landscape water, the advantage of rainwater collection system is to save water resources, reduce energy consumption and cost, reduce flood risk, and promote environmental protection and sustainable development.

[0003] Prior art discloses a kind of roof rainwater collection system, including inlet pipeline, water purification device and water storage container, inlet pipeline is equipped with inlet, flow discharge port and water collecting pipeline, inlet is used to connect with the drain of roof, water purification device and water storage container are connected on water collecting pipeline;Rainwater turbidity detection element and flow discharge valve are provided on inlet pipeline, flow discharge valve is arranged at flow discharge port, rainwater turbidity detection element is electrically connected with flow discharge valve;Rainwater turbidity detection element is used to detect the turbidity of circulating rainwater, to control flow discharge valve to open when the detected turbidity is greater than turbidity set value, and to control flow discharge valve to close when the detected turbidity is less than turbidity set value.Rainwater turbidity detection element can effectively detect the turbidity of circulating rainwater in inlet pipeline, to truly and accurately judge whether the rainwater can be used as raw water, and the control accuracy of flow discharge and water collection is higher.

[0004] But because other small impurities and particles are mixed in rainwater, these impurities are easy to produce sediment in turbidity detection unit, cause uneven water quality, uneven water quality can affect detection result, cause rainwater with turbidity to be discarded, cause waste, or water with turbidity to enter water storage pool, affect the quality of use water. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the problems of rainwater easy to sediment, uneven turbidity and inaccurate detection of prior art rainwater collection system when doing turbidity detection, provide a kind of roof rainwater collection system, can make the rainwater turbidity in detection unit uniform, improve detection precision.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0007] The utility model provides a roof rainwater collection system, including rainwater collection unit, turbidity detection unit connected with the water outlet of rainwater collection unit, water storage unit connected with the water outlet of turbidity detection unit and filter unit connected with the water outlet of water storage unit, the turbidity detection unit inside is equipped with detection cavity and the abandoned flow channel who communicates with detection cavity, the turbidity detection unit still includes a plurality of stirring device, turbidity sensor, abandoned flow valve and inlet valve in detection cavity respectively, the abandoned flow valve sets up at abandoned flow channel, the inlet valve sets up at the pipeline between turbidity detection unit and water storage unit, turbidity sensor is electrically connected with abandoned flow valve and inlet valve respectively, and the stirring device is used for stirring rainwater.

[0008] The rainwater collection system can collect rainwater when it rains, and then the collected rainwater enters the turbidity detection unit through the water collection channel. The detection cavity is provided in the turbidity detection unit and can store a certain amount of rainwater. The stirring device in the detection cavity is started to stir the rainwater, so that the turbidity of the rainwater in the detection cavity is uniform, thereby improving the accuracy of turbidity detection. The turbidity sensor can detect the turbidity of the rainwater in the detection cavity. If the turbidity is too high, the abandoned flow valve will be opened to discharge the rainwater in the detection cavity. If the turbidity is low, the inlet valve will be started, and the rainwater will exit from the inlet valve and enter the water storage unit. The water storage unit can store a large amount of rainwater. When water is needed, the stored rainwater will pass through the filter unit. The filter unit filters the rainwater, and then the rainwater can be used for toilet flushing, greening water, and other non-drinking water purposes. The setting of the stirring device makes the turbidity of the rainwater in the detection cavity uniform through stirring, improves the accuracy of turbidity detection, avoids deviations in the detection results caused by rainwater sedimentation, and thereby discharges rainwater with a passable turbidity or sends rainwater with an unpassable turbidity into the water storage unit, affecting the quality of the used water.

[0009] Further, the stirring device includes a driving member fixed to the inner wall of the detection cavity, a rotating shaft connected to the output end of the driving member, and a plurality of stirring wheels fixed to the rotating shaft. The driving member drives the rotating shaft to rotate when it is started, thereby driving the stirring wheels to rotate. The rotation of the stirring wheels stirs the rainwater in the detection cavity, thereby realizing the stirring of the rainwater.

[0010] Further, the turbidity detection unit is located at the bottom of the detection chamber; the axis of the rotating shaft is parallel to the horizontal plane. Since the impurities and particles carried by the rainwater are prone to deposit at the bottom of the detection chamber, the stirring device is arranged at the bottom of the detection chamber, so that the vortex brought by the rotation of the stirring wheel can better lift the deposit, and the rotating axis of the stirring wheel is parallel to the horizontal line, so that the vortex in the detection chamber can uniformly distribute the particles in the vertical direction, so that the detection result is more accurate.

[0011] Further, the water storage unit comprises a water storage tank, an external ladder installed on the side of the water storage tank, an internal ladder installed inside the water storage tank, and a skylight opened on the top of the water storage tank. The water storage tank can store rainwater discharged from the turbidity detection unit, the external ladder facilitates climbing to the top of the water storage tank, the skylight facilitates observing the internal condition of the water storage tank, and the internal ladder facilitates climbing into the water storage tank.

[0012] Further, the water storage unit is further provided with an overflow pipe, one end of the overflow pipe is installed on the side of the water storage tank, and the distance between the end and the bottom of the water storage tank accounts for three-fifths to four-fifths of the height of the water storage tank, and the other end is connected to the drainage pipeline. When the water level in the water storage tank reaches the water inlet of the overflow pipe, the excess water will be discharged from the overflow pipe to the drainage pipeline, avoiding excessive flow and causing pressure on the system, resulting in system collapse and equipment damage.

[0013] Further, the water storage unit is further provided with a vent pipe and a backwashing pipe, one end of the vent pipe is connected to the bottom of the water storage tank, the other end is connected to the drainage pipeline, the vent pipe is provided with a vent valve, the backwashing pipe is fixed to the bottom of the water storage tank, one end of the backwashing pipe is located in the water storage tank, and the other end extends to the outside of the water storage tank. After the water storage tank is used for a period of time, particles and impurities in the water may accumulate at the bottom of the water storage tank, affecting water quality and storage capacity. By opening the vent valve, the sediment can be discharged from the vent pipe. When cleaning the water storage tank, a certain amount of clean water or wastewater can be injected into the water storage tank through the backwashing pipe to help remove the sediment and maintain the water quality and storage space in the water storage tank.

[0014] Further, the filter unit comprises a filter container, a filter medium and a blind plate, the water inlet pipe of the filter unit is located at the top of the filter container, the water outlet pipe is located at the bottom of the filter container, the filter medium is located between the water inlet pipe and the water outlet pipe of the filter unit, and the blind plate is installed in the filter container and located at the bottom of the filter medium. When water is needed, the water in the water storage tank will be released into the filter unit and flow from top to bottom in the filter container. The rainwater passes through the filter medium to remove part of the impurities, so that the rainwater reaches the usable level. When the filter medium is saturated and needs to be replaced, the medium can be replaced by disassembling the blind plate.

[0015] Further, the filter medium is gravel layer, quartz sand layer and anthracite layer from top to bottom. The gravel, quartz sand and anthracite are used for removing large particle impurities, organic matter and odor in water respectively.

[0016] Further, the rainwater collecting unit is installed on the top of the building, and the rainwater collecting unit comprises a drainage plate, the drainage plate forms an angle with the horizontal plane, and the bottom end of the drainage plate is located at the water inlet of the turbidity detection unit, wherein the bottom end is the lower end in the vertical direction. Since the drainage plate forms an angle with the horizontal plane, the rainwater falling on the drainage plate can enter the water inlet of the turbidity detection unit along the drainage plate under its own gravity, and the collection efficiency is higher.

[0017] Further, the water inlet of the turbidity detection unit is funnel-shaped and is internally provided with a detachable filter screen. During the collection of rainwater, some larger impurities such as leaves and plastic bags may be brought in, and the filter screen can block these impurities to avoid blocking the pipeline.

[0018] Compared with the prior art, the rainwater collecting system has the following beneficial effects:

[0019] 1. The stirring device is arranged in the detection cavity, the rainwater turbidity in the detection cavity is made uniform through stirring, the accuracy of turbidity detection is improved, deviation of the detection result caused by rainwater precipitation is avoided, rainwater with qualified turbidity is discharged, or rainwater with unqualified turbidity is sent into the water storage unit, and the quality of the use water is affected;

[0020] 2. The overflow pipe arranged in the water storage unit avoids that the water level of the water storage tank is too high and the system pressure is too large, so that the system is damaged or the equipment is damaged, the blow-off pipe and the backwashing pipe are arranged, the two pipes cooperate with each other, water is injected and discharged, so that the sediment at the bottom of the water storage tank is taken away, and the water quality and the water storage space in the water storage tank are ensured;

[0021] 3. The water inlet of the turbidity detection unit is provided with a detachable filter screen, some larger impurities brought in during rainfall are blocked, and the pipeline is prevented from being blocked. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 is a structural schematic view of a roof rainwater collecting system;

[0023] Figure 2 Fig. 4 is a structural schematic view of a turbidity detection unit;

[0024] Figure 3 Fig. 5 is a structural schematic view of another view of the turbidity detection unit;

[0025] Figure 4 Fig. 6 is a structural schematic view of a water storage unit;

[0026] Figure 5 Structure diagram of a filtering unit.

[0027] In the drawings: 100, rainwater collection unit; 110, drainage plate; 200, turbidity detection unit; 210, filter screen; 220, detection cavity; 230, waste flow channel; 240, stirring device; 241, driving piece; 242, rotating shaft; 243, stirring wheel; 250, turbidity sensor; 260, waste flow valve; 270, water inlet valve; 300, water storage unit; 310, water storage tank; 320, outer ladder; 330, inner ladder; 340, skylight; 350, overflow pipe; 360, vent pipe; 361, vent valve; 370, backwashing pipe; 400, filtering unit; 410, filtering container; 420, filtering medium; 421, gravel layer; 422, quartz sand layer; 423, anthracite layer; 430, blind plate; 500, first water pump; 600, second water pump; 700, third water pump. DETAILED DESCRIPTION

[0028] The utility model will be further explained in connection with specific implementation. Among them, the drawings are only for example explanation, and the representation is only schematic diagram, and can not be understood as the restriction of the patent; in order to better illustrate the embodiment of the utility model, some components of the drawings will be omitted, enlarged or reduced, and the size of actual product is not represented; for those skilled in the art, some well-known structure and its description in the drawings can be omitted and understood.

[0029] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore the position relationship description in the drawings is only for example explanation, and can not be understood as the restriction of the patent, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0030] Embodiment one

[0031] A roof rainwater collection system, such as Figures 1-3As shown, the rainwater collecting unit 100, the turbidity detection unit 200 connected with the water outlet of the rainwater collecting unit 100, the water storage unit 300 connected with the water outlet of the turbidity detection unit 200, and the filtering unit 400 connected with the water outlet of the water storage unit 300, the rainwater collecting unit 100, the turbidity detection unit 200, the water storage unit 300, and the filtering unit 400 are connected through pipelines, the detection cavity 220 and the abandoned flow channel 230 in communication with the detection cavity 220 are arranged in the turbidity detection unit 200, the filtering unit 400 can be connected to a water using unit through a pipeline, the water using unit can be a toilet, an irrigation device, a car washing device, etc., the rainwater collecting unit 100 comprises a drainage plate 110, the drainage plate 110 forms an angle of 3° with the horizontal plane, and the bottom end of the drainage plate 110 is located at the water inlet of the turbidity detection unit 200, wherein the bottom end is the lower end in the vertical direction, the water inlet of the turbidity detection unit 200 is funnel-shaped and internally provided with a detachable filter screen 210, the turbidity detection unit 200 further comprises three stirring devices 240, a turbidity sensor 250, an abandoned flow valve 260, and a water inlet valve 270 arranged in the detection cavity 220 respectively, the stirring device 240 is located at the bottom of the detection cavity 220, the stirring device 240 comprises a driving member 241 fixed to the inner wall of the detection cavity 220, a rotating shaft 242 connected with the output end of the driving member 241, and four stirring wheels 243 uniformly distributed on the rotating shaft 242, in this embodiment, the driving member 241 is a stirring motor, the axis of the rotating shaft 242 is parallel to the horizontal plane, the blade surface of the stirring wheel 243 is coated with a fluorinated polymer coating, the blade and the impeller of the stirring wheel 243 are detachably connected through buckles, the abandoned flow valve 260 is arranged at the abandoned flow channel 230, the water inlet valve 270 is arranged at the pipeline between the turbidity detection unit 200 and the water storage unit 300, the turbidity sensor 250 is electrically connected with the abandoned flow valve 260 and the water inlet valve 270 respectively, in this embodiment, the water inlet valve 270 and the abandoned flow valve 260 are both solenoid valves.

[0032] The working principle of the embodiment is as follows:

[0033] The utility model discloses a rainwater collecting system, the rainwater collecting unit 100 of this system is arranged at the top of building, when raining, the rainwater collecting unit 100 of this system can be used to collect rainwater, because the included angle is formed to the horizontal plane by the flow guide plate 110, so the rainwater falling on the flow guide plate 110 can enter the water inlet of turbidity detection unit 200 along the flow guide plate 110 under the gravity, and the collection efficiency is higher, the filter screen 210 can block some larger sundries such as leaves, plastic bags, avoid blocking the pipeline, then the collected rainwater enters turbidity detection unit 200 through the pipeline, and turbidity detection unit 200 is equipped with detection cavity 220, can store a certain amount of rainwater, because the impurities and particulate matters carried by rainwater are easy to deposit at the bottom of detection cavity 220, the driving element 241 arranged at the bottom of detection cavity 220 can drive rotating shaft 242 to rotate, thereby driving stirring wheel 243 to rotate, the rainwater in detection cavity 220 is agitated by the rotation of stirring wheel 243, and the vortex driven by the rotation of stirring wheel 243 lifts the deposit, and the rotating shaft 242 of stirring wheel 243 is parallel to the horizontal line, therefore the vortex in detection cavity 220 can drive particulate matters to be evenly distributed in the vertical direction, make the turbidity of rainwater in detection cavity 220 be even, thereby can improve the accuracy of turbidity detection, and turbidity sensor 250 can detect the turbidity of rainwater in detection cavity 220, if the turbidity is too high, then will control the opening of the flush valve 260, and the rainwater in detection cavity 220 is discharged, if the turbidity is lower, then starts the water inlet valve 270, and the rainwater leaves from the water inlet valve 270, enters storage unit 300, and storage unit 300 can store a large amount of rainwater, when needing to use water, the stored rainwater will pass through filter unit 400, and filter unit 400 filters rainwater, and the rainwater after that can be used for non-drinking water purposes such as toilet flushing and greening water.

[0034] The beneficial effects of the embodiment are as follows:

[0035] The stirring device 240 is arranged in the detection cavity 220, the rainwater turbidity in the detection cavity 220 is made even by stirring, the accuracy of turbidity detection is improved, deviation of the detection result caused by rainwater deposition is avoided, thereby the rainwater with qualified turbidity is discharged, or the rainwater with unqualified turbidity is sent into the storage unit, the quality of the used water is influenced, the stirring device 240 is arranged at the bottom of the detection cavity, the vortex driven by the rotation of stirring wheel 243 can better remove the deposit, the rotating axis of stirring wheel 243 is parallel to the horizontal line, therefore the vortex in the detection cavity 220 can drive particulate matters to be evenly distributed in the vertical direction, the detection result is more accurate, the blade surface is coated with fluorinated polymer coating, the adhesion of the suspended matter in water can be reduced, the self-cleaning ability of the equipment is improved, thereby the cleaning frequency is reduced, the blade and the impeller are connected through the buckle, when needing to maintain or replace the blade, the disassembly speed is faster.

[0036] Embodiment two

[0037] This embodiment is a second embodiment of a roof rainwater collection system, which is similar to embodiment one, except that, as shown in Figure 1 and Figure 4 a first water pump 500 is arranged at the pipeline between the water storage unit 300 and the turbidity detection unit 200, the water storage unit 300 comprises a water storage tank 310, an external ladder 320 installed on the side of the water storage tank 310, an internal ladder 330 installed inside the water storage tank 310, a skylight 340 opened on the top of the water storage tank 310, an overflow pipe 350, a vent pipe 360, and a backwashing pipe 370, one end of the overflow pipe 350 is installed on the side of the water storage tank 310, and the distance between the end and the bottom of the water storage tank 310 accounts for four-fifths of the height of the water storage tank 310, the other end is connected to the drainage pipeline, one end of the vent pipe 360 is connected to the bottom of the water storage tank 310, the other end is connected to the drainage pipeline, and a vent valve 361 is arranged at the vent pipe 360, the backwashing pipe 370 is fixed to the bottom of the water storage tank 310, one end of the backwashing pipe 370 is located inside the water storage tank 310, and the other end extends to the outside of the water storage tank 310 and is provided with a pipe plug.

[0038] The working principle of this embodiment is as follows:

[0039] The water storage tank 310 can store rainwater discharged from the turbidity detection unit 200, the external ladder 320 facilitates climbing to the top of the water storage tank 310, the skylight 340 facilitates observing the inside of the water storage tank 310, the internal ladder 330 facilitates climbing to the inside of the water storage tank 310, when the water level in the water storage tank 310 reaches the water inlet of the overflow pipe 350, the excess water will be discharged from the overflow pipe 350 to the drainage pipeline, avoiding excessive flow causing pressure on the system, leading to system collapse and equipment damage, when the water storage tank 310 is used for a period of time, particles and impurities in the water may accumulate at the bottom of the water storage tank 310, affecting water quality and storage capacity, by opening the vent valve 361, the sediments can be discharged from the vent pipe 360, when cleaning the water storage tank 310, a certain amount of clean water or wastewater can be injected into the inside of the water storage tank 310 through the backwashing pipe 370 to help remove sediments and maintain water quality and storage space in the water storage tank 310.

[0040] The remaining working principles of this embodiment are the same as those of embodiment one.

[0041] Embodiment three

[0042] This embodiment is a third embodiment of a roof rainwater collection system, which is similar to embodiments one and two, except that, as shown in Figure 1 and Figure 5As shown, the pipeline between the water storage unit 300 and the filtering unit 400 is provided with a second water pump 600, and the water storage unit 300 and the water using unit are provided with a third water pump 700, the filtering unit 400 comprises a filtering container 410, a filtering medium 420 and a blind plate 430, the water inlet pipe of the filtering unit 400 is located at the top of the filtering container 410, the water outlet pipe is located at the bottom of the filtering container 410, the filtering medium 420 is located between the water inlet pipe and the water outlet pipe of the filtering unit 400, the blind plate 430 is installed in the filtering container 410 and located at the bottom of the filtering medium 420, and the filtering medium 420 comprises a gravel layer 421, a quartz sand layer 422 and an anthracite layer 423 from top to bottom, and the material and composition of the filtering medium 420 can also be replaced according to actual needs.

[0043] The working principle of the embodiment is as follows:

[0044] When water is needed, the water in the water storage tank 310 is extracted into the filtering unit 400 by the second water pump 600 and flows from top to bottom in the filtering container 410, and the rainwater passes through the gravel layer 421, the quartz sand layer 422 and the anthracite layer 423 to remove large particles, organic matter and odors in the water, so that the rainwater reaches the usable level, and when the filtering medium 420 is saturated and needs to be replaced, the medium can be replaced by disassembling the blind plate 430.

[0045] The remaining working principle of the embodiment is consistent with that of the first embodiment and the second embodiment.

[0046] In the specific contents of the above specific embodiments, any inconsistent combination of technical features can be combined, and in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of these technical features does not exist, it should be considered that it is within the scope of the present application.

[0047] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A roof rainwater collecting system comprising a rainwater collecting unit (100), a turbidity detecting unit (200) connected to a water outlet of the rainwater collecting unit (100), a water storage unit (300) connected to a water outlet of the turbidity detecting unit (200), and a filtering unit (400) connected to a water outlet of the water storage unit (300), the rainwater collecting unit (100), the turbidity detecting unit (200), the water storage unit (300), and the filtering unit (400) being connected by pipes, characterized in that, The turbidity detection unit (200) is internally provided with a detection cavity (220) and a bypass channel (230) communicated with the detection cavity (220), and further comprises a plurality of stirring devices (240), a turbidity sensor (250), a bypass valve (260) and a water inlet valve (270) respectively located in the detection cavity (220), the bypass valve (260) is arranged at the bypass channel (230), the water inlet valve (270) is arranged at a pipeline between the turbidity detection unit (200) and the water storage unit (300), the turbidity sensor (250) is electrically connected with the bypass valve (260) and the water inlet valve (270) respectively, and the stirring device (240) is used for stirring rainwater.

2. A roof rainwater collection system according to claim 1, wherein, The stirring device (240) comprises a driving member (241) fixed to an inner wall of the detection cavity (220), a rotating shaft (242) connected with an output end of the driving member (241) and a plurality of stirring wheels (243) fixed on the rotating shaft (242).

3. A roof rainwater collection system according to claim 2, wherein, The turbidity detection unit (200) is located at the bottom of the detection cavity (220), and an axis of the rotating shaft (242) is parallel to a horizontal plane.

4. A roof rainwater collection system according to claim 1, wherein, The water storage unit (300) comprises a water storage tank (310), an outer ladder (320) arranged on a side surface of the water storage tank (310), an inner ladder (330) arranged in the water storage tank (310) and a skylight (340) arranged on a top of the water storage tank (310).

5. A roof rainwater collection system according to claim 4 wherein, The water storage unit (300) is further provided with an overflow pipe (350), one end of the overflow pipe (350) is arranged on a side surface of the water storage tank (310), and a distance between the one end and a bottom of the water storage tank (310) accounts for three-fifths to four-fifths of a height of the water storage tank (310), and the other end is connected to a drainage pipeline.

6. A roof rainwater collection system according to claim 5 wherein, The water storage unit (300) is further provided with a vent pipe (360) and a backwashing pipe (370), one end of the vent pipe (360) is connected to the bottom of the water storage tank (310), the other end is connected to the drainage pipeline, a vent valve (361) is arranged at the vent pipe (360), the backwashing pipe (370) is fixed to the bottom of the water storage tank (310), one end of the backwashing pipe (370) is located in the water storage tank (310), and the other end extends to an outside of the water storage tank (310).

7. A roof rainwater collection system according to claim 1 wherein, The filter unit (400) comprises a filter container (410), a filter medium (420) and a blind plate (430), a water inlet pipe of the filter unit (400) is located at a top of the filter container (410), a water outlet pipe is located at a bottom of the filter container (410), the filter medium (420) is located between the water inlet pipe and the water outlet pipe of the filter unit (400), and the blind plate (430) is arranged in the filter container (410) and located at a bottom of the filter medium (420).

8. A roof rainwater collection system according to claim 7, wherein, The filter medium (420) comprises, from top to bottom, a gravel layer (421), a quartz sand layer (422) and an anthracite layer (423).

9. A roof rainwater collection system according to any one of claims 1 to 8, wherein, The rainwater collecting unit (100) is installed on the top of a building, and comprises a drainage plate (110) which forms an angle with the horizontal plane, and the bottom end of the drainage plate (110) is located at the water inlet of the turbidity detection unit (200).

10. A roof rainwater collection system according to claim 9, wherein, The water inlet of the turbidity detection unit (200) is funnel-shaped and internally provided with a detachable filter screen (210).

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