Urban inland inundation water level detection device and detection method thereof

Abstract

The invention relates to the technical field of water level detection, and discloses an urban inland inundation water level detection device and a detection method thereof.The urban inland inundation water level detection device comprises a detection module, a power generation module and a power transmission cable, and the detection module comprises a barrel; the connector is fixed at the top of the barrel; the alarm is mounted at the top of the connector; the rod body is fixed at the bottom end of the connector and extends into the barrel body; the heavy ball is fixed at the end part of the rod body; the hollow bottle sleeves the rod body in a sliding manner; the lantern ring is fixed at the opening of the hollow bottle; the water level sensor and the barrel are arranged in the lantern ring and fixedly placed in urban sewer flow in a vertical posture, a Karman vortex street is formed on the side, opposite to the impact of the water flow, of the barrel, the power generation module is arranged in a vortex of the Karman vortex street, and a pendulum bob in the power generation module can swing around a second vertical rod in a reciprocating mode along with the action of the water flow. And the electromagnetic induction power generation unit and the piezoelectric power generation unit are continuously hit to supply power to the alarm and the water level sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of water level detection, and more specifically, to a device and method for detecting urban waterlogging water level. Background Art

[0002] Urban waterlogging refers to the accumulation of water in urban areas due to poor drainage systems or exceeding system capacity during heavy rain or continuous rainfall. Urban waterlogging may have serious impacts on transportation, residents' lives, infrastructure and the environment.

[0003] Water level detection can help urban management departments monitor the operating status and efficiency of rainwater drainage systems in real time. By monitoring the water level, risk areas that may cause waterlogging can be discovered and warned in a timely manner, so that preventive measures can be taken to reduce the losses caused by waterlogging to citizens' lives and property.

[0004] Water level detection devices used for urban waterlogging are generally deployed around urban underground water pipes to detect water level changes in real time and provide feedback data. Some water level detection devices are also equipped with sound and light alarm systems to give warnings by whistling or flashing lights when the water level exceeds the warning line. These facilities, whether they are sensors for detecting water levels and providing feedback data, signal transmitters, or sound and light alarms that can sound alarms, all require power support to function.

[0005] However, under current conditions, it is unrealistic to equip each water level detection device with a dedicated power transmission line. Therefore, water level detection devices used for urban flooding are generally powered by batteries. However, battery power supply has the disadvantages of limited power and large volume. It is very troublesome to manually check and replenish the detector regularly. Summary of the invention

[0006] The present invention provides a device for detecting water level in urban waterlogging and a detection method thereof, which solve the technical problem of inconvenient power supply to water level detection elements in the related art.

[0007] The present invention provides a device for detecting water level in urban waterlogging, comprising a detection module, a power generation module and a power transmission cable;

[0008] The detection module comprises a cylinder; a connector fixed on the top of the cylinder; an alarm installed on the top of the connector; a rod fixed at the bottom of the connector and extending into the cylinder; a heavy ball fixed at the end of the rod; a hollow bottle slidably sleeved on the rod; a collar fixed at the mouth of the hollow bottle; a water level sensor arranged in the collar, and a plurality of filters arranged at the bottom of the cylinder;

[0009] The cylinder is fixedly placed in a vertical position in the urban sewage flow, forming a Karman vortex street on the side facing away from the impact of the water flow, and the power generation module is arranged in the vortex of the Karman vortex street;

[0010] The alarm is electrically connected to the water level sensor, and the power generation module supplies power to the alarm and the water level sensor via a power transmission cable;

[0011] The power generation module comprises a first vertical pole; a first carrier plate rotatably mounted on the first vertical pole; a mass fixed on the first carrier plate; a second carrier plate fixed on the mass block; a second vertical pole fixed at the center of the second carrier plate; a pendulum rotatably mounted on the second end of the vertical pole; a bluff body fixed on the mass block; an electromagnetic induction power generation unit arranged on the top of the inner side of the mass block; and a piezoelectric power generation unit arranged on the bottom of the inner side of the mass block;

[0012] Under the Karman vortex street effect, the pendulum deflects back and forth relative to the vertical rod, and the end of the pendulum hits the electromagnetic induction power generation unit and the piezoelectric power generation unit, generating current that converges into the transmission cable.

[0013] As a further solution of the present invention: the electromagnetic induction power generation unit comprises: a substrate; a coil fixed in the substrate; a cable connected to the coil; a collector connected between the cable and the power transmission cable; a spring fixed to one side of the substrate to convert the alternating current generated from the two poles of the coil into a pulse current transmitted to the alarm and the water level sensor; a top plate fixed to the end of the spring; and a magnetic block fixed to the inner side of the top plate;

[0014] The coil, cable one and current collector one form a closed loop;

[0015] The magnetic block is directly opposite to the cavity of the coil;

[0016] The top plate is in compression contact with the end of the pendulum.

[0017] As a further solution of the present invention: the piezoelectric power generation unit comprises a piezoelectric block; two cables respectively fixed to the two poles of the piezoelectric block; and a collector connected between the two cables and the power transmission cable;

[0018] The piezoelectric block is made of piezoelectric material.

[0019] As a further solution of the present invention: a cover is fixedly provided on the second vertical pole, and the power transmission cable is partially wrapped in the cavity of the cover.

[0020] As a further solution of the present invention: a plurality of water holes for accommodating filter elements are provided at the bottom of the cylinder.

[0021] As a further solution of the present invention: a vent hole is provided on the top of the cylinder.

[0022] As a further solution of the present invention: columns are symmetrically arranged on the outside of the cylinder, and the columns are fixedly connected to the top of the cylinder with a connecting frame. The columns are consistent in size with the cylinder and are arranged on the side of the cylinder facing away from the impact of the water flow, and are arranged in a triangular shape between the columns and the cylinder.

[0023] As a further solution of the present invention: the end of the bluff body is in an arc shape.

[0024] As a further solution of the present invention: both ends of the pendulum are in an expanded diameter shape relative to the center thereof.

[0025] A detection method, using the above-mentioned urban water level detection device, comprises the following steps:

[0026] S1, water level change feedback: Due to the setting of the filter element and the water hole, the inner cavity of the cylinder and the external water flow environment form a communicating vessel. After the external water flow is filtered by the filter element, it enters the inner cavity of the cylinder, and the water level in the cylinder is consistent with the external water level;

[0027] S2. Water level detection: As the water level changes, the hollow bottle slides along the rod under the action of buoyancy, and the water level sensor in the collar at the mouth of the hollow bottle detects the water level in real time;

[0028] S3, over-limit alarm: set the alarm program in advance in the alarm device to alarm when the water level exceeds the warning water level line. When the height data detected by the water level sensor exceeds the warning water level line, the alarm device will sound an alarm.

[0029] S4. Power supply: The Karman vortex effect formed on the back side of the cylinder directly acts on the power generation module, driving the pendulum in the power generation module to swing up and down, hitting the electromagnetic induction power generation unit and the piezoelectric power generation unit, generating current that converges into the transmission cable to provide power for the water level sensor and alarm.

[0030] The beneficial effects of the present invention are:

[0031] The present invention sets a cylinder to isolate the water level detection area from the external water area, and sets a water through hole at the bottom of the cylinder to form a communicating vessel, so that the water level inside the cylinder is consistent with the water level of the external water area, and the influence of floating debris on the water surface is isolated by the outer shell of the cylinder, and the influence of debris carried in the water body is isolated by the filter element, so that the detection area formed inside the cylinder has only a pure water environment, ensuring that the accuracy of the detection result will not be affected by the debris in the water flow.

[0032] The present invention aims at cleverly avoiding the adverse effect of a layer of silt on the floating effect at the bottom of the water body by cooperating with the mouth of the hollow bottle and the heavy ball. Moreover, even when the thickness of the silt layer exceeds that of the heavy ball, the hollow bottle of the present invention can be subjected to the buoyancy of relatively more parts in the depth direction compared with the traditional floating ball and floating plate, and is less likely to be restricted by the silt.

[0033] The present invention arranges a cylinder to form a barrier to the water flow, forming a Karman vortex street, so that the pendulum inside the power generation module can generate a reciprocating swing motion around the second vertical pole under the action of the water flow, continuously hitting the electromagnetic induction power generation unit and the piezoelectric power generation unit, and supplying power to the alarm and the water level sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a device for detecting water level in urban waterlogging proposed by the present invention;

[0035] Figure 2 It is a schematic diagram of a partially exploded structure of a device for detecting water level in urban waterlogging proposed by the present invention;

[0036] Figure 3 It is a schematic diagram of the action of the detection module in the urban water level detection device proposed by the present invention as the water level changes;

[0037] Figure 4 It is a schematic diagram of the decomposition structure of a detection module in a device for detecting water level in urban waterlogging proposed by the present invention;

[0038] Figure 5 It is a detailed structural diagram of a detection module in a device for detecting water level in urban waterlogging proposed by the present invention;

[0039] Figure 6 It is a schematic diagram of the Karman vortex street effect formed when a single column structure is subjected to water flow;

[0040] Figure 7 It is a schematic diagram of the Karman vortex street effect formed when three column structures are arranged in a triangle and subjected to the action of water flow;

[0041] Figure 8 It is a schematic diagram of the overall structure of a power generation module in a device for detecting water level in urban waterlogging proposed by the present invention;

[0042] Fig. 9 It is a detailed structural diagram of a power generation module in a device for detecting water level in urban waterlogging proposed by the present invention;

[0043] Fig.10 It is a schematic diagram of the structure of an electromagnetic induction power generation unit in a device for detecting water level in urban waterlogging proposed by the present invention;

[0044] Fig.11 It is a schematic diagram of the structure of a piezoelectric power generation unit in a device for detecting water level in urban flooding proposed by the present invention.

[0045] In the figure: 1. detection module; 11. cylinder; 111. water hole; 112. vent hole; 12. connector; 13. alarm; 14. rod; 15. heavy ball; 16. hollow bottle; 17. collar; 18. water level sensor; 19. filter; 2. power generation module; 21. pole one; 22. carrier plate one; 23. mass block; 24. carrier plate two; 25. pole two; 251. cover; 26. pendulum; 27. bluff body; 28. electromagnetic induction power generation unit; 281. substrate; 282. coil; 283. cable one; 284. collector one; 285. spring; 286. top plate; 287. magnetic block; 29. ​​piezoelectric power generation unit; 291. piezoelectric block; 292. cable two; 293. collector two; 3. column; 4. connecting frame; 5. transmission cable. DETAILED DESCRIPTION

[0046] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0047] At least one embodiment of the present invention discloses a device for detecting urban flooding water level, such as Figure 1 - Fig.11 As shown, it includes a detection module 1, a power generation module 2 and a transmission cable 5;

[0048] The detection module 1 includes a cylinder 11; a connector 12 fixed to the top of the cylinder 11; an alarm 13 installed on the top of the connector 12; a rod 14 fixed to the bottom of the connector 12 and extending into the cylinder 11; a heavy ball 15 fixed to the end of the rod 14; a hollow bottle 16 slidably sleeved on the rod 14; a collar 17 fixed to the mouth of the hollow bottle 16; a water level sensor 18 arranged in the collar 17, and a plurality of filters 19 arranged at the bottom of the cylinder 11;

[0049] The cylinder 11 is fixedly placed in a vertical position in the urban sewage flow, and a Karman vortex street is formed on the side facing away from the impact of the water flow. The power generation module 2 is arranged in the vortex of the Karman vortex street;

[0050] The alarm 13 is electrically connected to the water level sensor 18, and the power generation module 2 supplies power to the alarm 13 and the water level sensor 18 through the power transmission cable 5;

[0051] The power generation module 2 includes a vertical pole 21; a carrier plate 22 rotatably mounted on the vertical pole 21; a mass 23 fixed on the carrier plate 22; a carrier plate 24 fixed on the mass 23; a vertical pole 25 fixed at the center of the carrier plate 24; a pendulum 26 rotatably mounted on the end of the vertical pole 25; a bluff body 27 fixed on the mass 23; an electromagnetic induction power generation unit 28 arranged on the top of the inner side of the mass 23; and a piezoelectric power generation unit 29 arranged on the bottom of the inner side of the mass 23;

[0052] Under the Karman vortex street effect, the pendulum 26 deflects back and forth relative to the vertical rod 25 , and the end of the pendulum 26 hits the electromagnetic induction power generation unit 28 and the piezoelectric power generation unit 29 , generating current that converges into the transmission cable 5 .

[0053] The present invention is used for water level detection of urban waterlogging, which requires that the detection device be set in the water flow of urban sewage. The water level detection is realized based on the buoyancy principle. Under the aforementioned special detection environment, floating objects and garbage impurities carried in the urban sewage will cover the detection part. When the water level changes, these debris will affect the floating of the detection part, resulting in inaccurate detection results. To solve this drawback, the present invention firstly performs an isolation design in the water level detection device, specifically:

[0054] Different from the traditional detection method of directly contacting the detection sensing part with the water body, the present invention first sets up a cylinder 11 to isolate the water level detection area from the external water body, and sets a water hole 111 at the bottom of the cylinder 11 to form a communicating vessel, so that the water level inside the cylinder 11 is consistent with the water level of the external water body, and the outer shell of the cylinder 11 is used to isolate the influence of floating debris on the water surface, and the filter element 19 is used to isolate the influence of debris carried in the water body, so that the detection area formed inside the cylinder 11 has only a pure water environment, ensuring that the accuracy of the detection result will not be affected by the debris in the water flow.

[0055] The filter element 19 can be implemented in the form of a filter net or a filter membrane and can be set according to the specific water environment.

[0056] The principle of water level detection is that as the water level changes, under the action of buoyancy, the hollow bottle 16 slides along the rod 14, and the water level sensor 18 arranged in the ring 17 at the bottle mouth of the hollow bottle 16 detects the water level in real time. Here, the buoyancy action part is set in the form of a combination of the hollow bottle 16, the heavy ball 15 and the rod 14. When the water level is low, Figure 3As shown in the figure on the left side, the mouth of the hollow bottle 16 is pressed against the upper part of the heavy ball 15. At this time, there is still a certain distance between the mouth of the hollow bottle 16 (the part where the water level sensor 18 is installed) and the bottom of the water. Compared with the single floating ball and floating plate form, this distance maintenance has a special improvement significance. The reason is that as mentioned above, the detection environment of the present invention is in the city's sewage, not a clean water environment. In this water body, there will be a layer of silt at the bottom of the water body. If the traditional single floating ball and floating plate form is used, the water level will be When at the lowest point, the float and the floating plate will sink into the mud, which may easily cause the float and the floating plate to get stuck, making it difficult for them to float again when the water level rises. In response to this reality, the present invention uses a hollow bottle 16 with a bottle mouth that cooperates with the heavy ball 15 to cleverly circumvent this problem. Even when the thickness of the mud layer exceeds that of the heavy ball 15, the hollow bottle 16 of the present invention, compared with the traditional float and floating plate, can be affected by buoyancy in the depth direction. It is difficult to be restricted by the mud.

[0057] Under existing conditions, it is unrealistic to equip each water level detection device with a dedicated power transmission line. Therefore, water level detection devices used for urban flooding are generally powered by batteries. However, battery power supply has the disadvantages of limited power and large volume, and manual inspection and power replenishment of the detector are required at regular intervals. To solve this dilemma, the present invention realizes the use of water flow to power the alarm 13 and the water level sensor 18.

[0058] The above-mentioned arrangement of the cylinder 11 to block the water flow is not only conducive to improving the accuracy of detection, but also extends in the power generation direction. Specifically:

[0059] The cylinder 11 is fixedly placed in the urban sewage flow in an upright posture, and a Karman vortex street is formed on the side facing away from the impact of the water flow. The Karman vortex street effect is that when the incoming flow bypasses certain objects, the two sides of the object will periodically shed double-row line vortices with opposite rotation directions and arranged in a regular pattern. At the beginning, the two rows of line vortices maintain their own movement and move forward respectively, and then they interfere with each other and attract each other, and the interference becomes larger and larger, forming a nonlinear so-called vortex street, such as Figure 6 Realistic water flow effect shown in medium gray.

[0060] In the power generation module 2, the carrier plate 22 forms a rotating structure relative to the vertical rod 21, and combined with the design of the baffle body 27, the various structures installed on the carrier plate 22 rotate in the vortex of the Karman vortex street, which further promotes the vortex street effect. The Karman vortex street can not only produce rotation, but also produce up and down fluctuations. The formation and shedding of the vortex will produce a periodic force on the object, causing the object to vibrate. Under specific conditions, this periodic force can not only cause the object to produce rotational motion, but also cause the object to fluctuate up and down. Specifically in the power generation module 2, the rotatable connection between the pendulum 26 and the vertical rod 25 is a specific representation of the above-mentioned specific conditions. Therefore, in the power generation module 2 in the vortex, the pendulum 26 inside it can produce a reciprocating swinging motion around the vertical rod 25 with the action of the water flow.

[0061] The power generation module 2 of the present invention generates electricity based on the above-mentioned reciprocating swinging motion. When the pendulum 26 reciprocates, its end will continuously hit the electromagnetic induction power generation unit 28 and the piezoelectric power generation unit 29.

[0062] The electromagnetic induction power generation unit 28 includes: a substrate 281; a coil 282 fixed in the substrate 281; a cable 283 respectively connected to the coil 282; a collector 284 connected between the cable 283 and the transmission cable 5; a spring 285 fixed to one side of the substrate 281; a top plate 286 fixed to the end of the spring 285; and a magnetic block 287 fixed to the inner side of the top plate 286; the coil 282, the cable 283 and the collector 284 form a closed loop, the magnetic block 287 is opposite to the cavity of the coil 282, and the top plate 286 is in compression contact with the end of the pendulum 26;

[0063] The part of the electromagnetic induction power generation unit 28 that is struck back and forth is the top plate 286. When the pendulum 26 strikes the top plate 286, the magnet 287 extends into the coil 282. At this time, the spring 285 is compressed. When the pendulum 26 no longer strikes the top plate 286, the magnet 287 separates from the coil 282. The magnetic field reciprocates in the conductor formed by the coil 282, causing the magnetic flux passing through the closed circuit (the closed loop formed by the coil 282, the cable 283 and the collector 284) to change, thereby inducing electricity. Then the collector 284 converts the alternating current generated from the two poles of the coil 282 into a pulse current that is transmitted to the alarm 13 and the water level sensor 18 for power supply.

[0064] The piezoelectric power generation unit 29 includes a piezoelectric block 291; a cable 292 respectively fixed at the two poles of the piezoelectric block 291; and a collector 293 connected between the cable 292 and the transmission cable 5. The piezoelectric block 291 is made of piezoelectric material. When the piezoelectric material is struck back and forth by the pendulum 26, the positive and negative charges inside the two poles will move and rearrange, thereby generating an electric potential difference. By connecting the collector 293 to form a loop, an electric current is generated. Similarly, the collector 293 converts the alternating current generated from the two poles of the piezoelectric block 291 into a pulse current that is transmitted to the alarm 13 and the water level sensor 18 for power supply.

[0065] A cover 251 is fixedly provided on the second vertical pole 25 , and the power transmission cable 5 is partially covered in the cavity of the cover 251 . The cover 251 can provide waterproof protection for the portion of the power transmission cable 5 extending into the water body.

[0066] A vent hole 112 is provided at the top of the cylinder 11 to ensure that the pressure inside the cylinder 11 is balanced with the external atmospheric pressure.

[0067] The cylinder 11 is symmetrically provided with a column 3 outside, and a connecting frame 4 is fixedly connected to the top of the cylinder 11. The column 3 is consistent in size with the cylinder 11 and is arranged on the side of the cylinder 11 facing away from the impact of the water flow. The column 3 and the cylinder 11 are arranged in a triangular shape. The advantage of combining the column 3 with the cylinder 11 here is that the strength of the Karman vortex street effect can be increased. Figure 7 As shown, after simulation research, it was found that when the triangularly arranged columns 3 produce the Karman vortex street effect, the swing amplitude of the vortex is larger than that of a single column 3, so the frequency of driving the pendulum 26 in the power generation module 2 is higher, and the amount of electricity generated is more sufficient.

[0068] The ends of the bluff body 27 are in an arc shape, so that the water resistance is reduced when it rotates. The two ends of the pendulum 26 are in an expanded diameter shape relative to the center, which can further increase the frequency of the swinging action.

[0069] The present invention also provides a detection method, which uses the above-mentioned urban waterlogging water level detection device, comprising the following steps:

[0070] S1, water level change feedback: Due to the setting of the filter 19 and the water hole 111, a communicating vessel is formed between the inner cavity of the cylinder 11 and the external water flow environment. After the external water flow is filtered by the filter 19, it enters the inner cavity of the cylinder 11, and the water level in the cylinder 11 is consistent with the external water level;

[0071] S2. Water level detection: As the water level changes, the hollow bottle 16 slides along the rod 14 under the action of buoyancy, and the water level sensor 18 disposed in the collar 17 at the mouth of the hollow bottle 16 detects the water level in real time;

[0072] S3, over-limit alarm: a program for alarming when exceeding the warning water level line is set in advance in the alarm 13. When the height data detected by the water level sensor 18 exceeds the warning water level line, the alarm 13 will sound an alarm;

[0073] S4. Power supply: The Karman vortex effect formed on the back side of the cylinder 11 directly acts on the power generation module 2, driving the pendulum 26 in the power generation module 2 to swing up and down, hitting the electromagnetic induction power generation unit 28 and the piezoelectric power generation unit 29, generating current that converges into the transmission cable 5, and providing power for the water level sensor 18 and the alarm 13.

[0074] The above describes an embodiment of the present invention, but this embodiment is not limited to the above-mentioned specific implementation mode. The above-mentioned specific implementation mode is merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make more forms of equivalent embodiments, all of which are within the protection of this embodiment.

Claims

1. A device for detecting urban waterlogging water level, characterized in that: include: A detection module (1), a power generation module (2) and a power transmission cable (5); The detection module (1) comprises a cylinder (11); a connector (12) fixed at the top of the cylinder (11); an alarm (13) installed at the top of the connector (12); a rod (14) fixed at the bottom of the connector (12) and extending into the cylinder (11); a heavy ball (15) fixed at the end of the rod (14); a hollow bottle (16) slidably sleeved on the rod (14); a collar (17) fixed at the mouth of the hollow bottle (16); a water level sensor (18) arranged in the collar (17); and a plurality of filter elements (19) arranged at the bottom of the cylinder (11); The cylinder (11) is fixedly placed in an upright position in a city sewage flow, forming a Karman vortex street on the side facing away from the impact of the water flow, and the power generation module (2) is arranged in the vortex of the Karman vortex street; The alarm (13) is electrically connected to the water level sensor (18), and the power generation module (2) supplies power to the alarm (13) and the water level sensor (18) via a power transmission cable; The power generation module (2) comprises a first vertical pole (21); a first carrier plate (22) rotatably mounted on the first vertical pole (21); a mass (23) fixed on the first carrier plate (22); a second carrier plate (24) fixed on the mass (23); a second vertical pole (25) fixed at the center of the second carrier plate (24); a pendulum (26) rotatably mounted on the end of the second vertical pole (25); a bluff body (27) fixed on the mass (23); an electromagnetic induction power generation unit (28) arranged at the top inner side of the mass (23); and a piezoelectric power generation unit (29) arranged at the bottom inner side of the mass (23); Under the Karman vortex street effect, the pendulum (26) deflects back and forth relative to the second vertical rod (25), and the end of the pendulum (26) strikes the electromagnetic induction power generation unit (28) and the piezoelectric power generation unit (29), generating current that converges into the transmission cable (5).

2. The urban flooding water level detection device according to claim 1, characterized in that: The electromagnetic induction power generation unit (28) comprises: a substrate (281); a coil (282) fixed in the substrate (281); cables (283) respectively connected to the coils (282); a collector (284) connected between the cables (283) and the power transmission cable (5); a spring (285) fixed on one side of the substrate (281) for converting the alternating current generated from the two poles of the coil into a pulse current transmitted to the alarm (13) and the water level sensor (18); a top plate (286) fixed to the end of the spring (285); and a magnetic block (287) fixed to the inner side of the top plate (286); The coil (282), cable one (283) and current collector one (284) form a closed loop; The magnetic block (287) is directly opposite to the cavity of the coil (282); The top plate (286) is in compression contact with the end of the pendulum (26).

3. The urban flooding water level detection device according to claim 1, characterized in that: The piezoelectric power generation unit (29) comprises a piezoelectric block (291); two cables (292) respectively fixed to the two poles of the piezoelectric block (291); and a second collector (293) connected between the two cables (292) and the power transmission cable (5); The piezoelectric block (291) is made of piezoelectric material.

4. The urban flooding water level detection device according to claim 1, characterized in that: A cover body (251) is fixedly arranged on the second vertical pole (25), and the power transmission cable (5) is partially covered in the cavity of the cover body (251).

5. The urban flooding water level detection device according to claim 1, characterized in that: The bottom of the cylinder (11) is provided with a plurality of water holes (111) for accommodating the filter element (19).

6. The urban flooding water level detection device according to claim 1, characterized in that: A vent hole (112) is provided on the top of the cylinder (11).

7. The urban flooding water level detection device according to claim 1, characterized in that: A column (3) is symmetrically arranged on the outside of the cylinder (11); a connecting frame (4) is fixedly connected between the column (3) and the top of the cylinder (11); the column (3) and the cylinder (11) have the same size and are arranged on the side of the cylinder (11) facing away from the impact of the water flow; the column (3) and the cylinder (11) are arranged in a triangular shape.

8. The urban flooding water level detection device according to claim 1, characterized in that: The end of the bluff body (27) is in an arc shape.

9. The urban flooding water level detection device according to claim 1, characterized in that: The two ends of the pendulum (26) are in an expanded diameter shape relative to the center thereof.

10. A detection method, using the urban flooding water level detection device as claimed in claims 1 to 9, characterized in that: The following steps are involved: S1, water level change feedback: Due to the arrangement of the filter element (19) and the water hole (111), a communicating vessel is formed between the inner cavity of the cylinder (11) and the external water flow environment. After the external water flow is filtered by the filter element (19), it enters the inner cavity of the cylinder (11), and the water level in the cylinder (11) is consistent with the external water level; S2. Water level detection: As the water level changes, the hollow bottle (16) slides along the rod (14) under the action of buoyancy, and a water level sensor (18) disposed in a collar (17) at the mouth of the hollow bottle (16) detects the water level in real time; S3, over-limit alarm: a program for alarming when the water level exceeds the warning water level line is set in advance in the alarm device (13). When the height data detected by the water level sensor (18) exceeds the warning water level line, the alarm device (13) will sound an alarm; S4. Power supply: The Karman vortex effect formed on the back side of the cylinder (11) directly acts on the power generation module (2), driving the pendulum in the power generation module (2) to swing up and down, hitting the electromagnetic induction power generation unit (28) and the piezoelectric power generation unit (29), generating current that converges into the transmission cable (5) to provide power for the water level sensor (18) and the alarm (13).

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