Tap water pipe network leak detection equipment based on noise

Abstract

The invention provides noise-based tap water pipe network leak detection equipment, and relates to the technical field of water pipe network detection. The noise-based tap water pipe network leak detection equipment comprises a shell, an upper flange, a lower flange, an edge calculation module, a communication module and a mass block. According to the invention, the environmental noise monitoring unit and the high-frequency signal acquisition unit are cooperatively deployed, and the wavelet packet decomposition algorithm is operated in real time by adopting edge calculation, so that the problem that a traditional single-point sensor cannot distinguish pipeline vibration, water flow turbulence and leakage signal spectrum characteristic difference is effectively solved, and the leakage characteristic identification accuracy is relatively improved by more than 20%; through the synergistic effect of the laser micro-woven annular groove, the liquid metal sealing structure and the composite elastic sealing structure, the problem of signal distortion caused by sealing failure of an existing leak detection instrument in a humid and corrosive underground environment is solved, and it is ensured that equipment can maintain stable high-frequency vibration signal acquisition capacity for a long time under severe working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of water pipe network detection, in particular to noise-based water pipe network leak detection equipment. Background Art

[0002] At present, the average leakage rate of domestic urban water supply pipelines exceeds 15%. The traditional leak detection mode mainly relies on manual listening. The working environment of leak detectors is poor, and they need to sacrifice their sleep time at night to go out to work. In addition, the work site in a night environment is full of cars coming and going, and the personal safety of leak detectors cannot be guaranteed. In addition, the inspection cycle is easily affected by climate and weather, and manual listening is easily disturbed by other environmental noises. Relying solely on manual experience and judgment is likely to affect the final leak detection effect.

[0003] To solve the above problems, many cities have adopted instrument leak detection instead of manual leak detection. The leak detection instrument needs to be placed on the water supply pipe, which is buried underground, so the instrument needs to overcome the poor working environment, which requires it to have good sealing performance.

[0004] For example, a high-sealing water pipe leak detector proposed in Chinese patent publication No. CN214948284U includes a shell, a mounting portion provided at the lower end, a step portion provided at the inner lower end of the mounting portion, and a plurality of limit grooves provided at the lower end of the mounting portion; an upper flange, fixedly mounted on the upper part of the shell; a lower flange, fixedly mounted on the mounting portion, the lower flange including a third convex ring provided on the upper part, the middle of the third convex ring extending upward to form a convex column, the middle of the convex column being provided with a mounting hole, the lower end of the lower flange extending radially outward to form a second convex ring, the upper end of the second convex ring being provided with a plurality of upwardly protruding limit blocks, the limit blocks fittingly snapping into the limit grooves; a noise collector, fixedly mounted on the upper part of the lower flange; a sealing ring, mounted between the lower flange and the mounting portion, the sealing ring including four support portions located on the outside, two adjacent support portions transitioned by an arc-shaped portion, and the inner support portion having an interference fit with the annular side wall of the lower flange;

[0005] However, in actual use, the aforementioned publicly available technologies still suffer from low signal sensitivity and poor environmental adaptability. These issues are primarily manifested in the following ways: while existing leak detection instruments improve sealing, their single-point noise acquisition method results in leak location errors of up to ±15 meters. Furthermore, existing technologies lack multi-physics field coupling analysis capabilities, making it impossible to distinguish between the spectral characteristics of pipeline vibration (>500Hz), water turbulence (20-200Hz), and true leak signals (1-5kHz). These deficiencies contribute to the persistently high leakage rate in my country's pipeline networks. There is an urgent need to develop a new leak detection system that integrates high-precision vibration sensing, adaptive sealing, and intelligent diagnostics. To address these issues, it is necessary to develop noise-based water pipeline leak detection equipment. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a noise-based water pipe network leak detection device, which solves the problems of low signal sensitivity and poor environmental adaptability of the noise-based water pipe network leak detection device in the prior art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a noise-based water pipe network leak detection device, including a shell, an upper flange, a lower flange, an edge computing module, a communication module and a mass block, the upper flange and the lower flange are respectively threadedly connected to the upper and lower ends of the shell, the upper wall of the upper flange and near the left and right sides are fixedly connected with a first antenna and a second antenna respectively, the upper wall of the upper flange and near the rear side is fixedly connected with a third antenna, the upper wall of the upper flange and in front of the third antenna is fixedly connected with a first accelerometer for capturing environmental noise, the inner wall of the shell is fixedly connected with a control box, the side of the control box facing the center of the shell is fixedly connected with a cover plate, the inner wall of the control box is fixedly connected with a control mainboard, and the edge computing module is arranged on the control mainboard A step is provided on the lower wall of the shell and close to the circumferential outer wall of the shell, the lower wall of the step abuts against the upper wall of the lower flange, and a first sealing structure is provided at the connection, a sealed cavity is formed between the inner wall of the step and the lower wall of the shell, a second sealing structure is provided inside the sealed cavity, a first boss is provided on the upper wall of the lower flange, the outer wall of the first boss is threadedly connected to the inner wall of the shell, the mass block is provided on the upper wall of the first boss, a second boss is provided on the lower wall of the mass block, a piezoelectric array structure is provided between the second boss and the first boss, a screw hole is provided on the inner wall of the mass block, a locking screw is provided through the screw hole, the lower end of the locking screw passes through the screw hole and is threadedly connected to the upper wall of the first boss, and a second accelerometer for capturing high-frequency signals is provided on the upper wall of the mass block.

[0008] Preferably, both the first accelerometer and the second accelerometer are three-axis MEMS accelerometers, and the range of the first accelerometer and the second accelerometer is ±200g.

[0009] When a pipeline leak occurs, the first accelerometer captures the 0-100Hz low-frequency ambient noise floor, while the second accelerometer simultaneously collects the 100Hz-8kHz high-frequency leakage characteristic wave. The dual sensor data is aligned in the time and frequency domain to eliminate signal phase differences.

[0010] Preferably, the first sealing structure includes multiple groups of annular grooves, which are distributed inside and outside and are arranged in sequence on the upper wall of the lower flange and are all located on the outer wall of the first boss. The multiple groups of annular grooves are formed by laser micro-weaving. The depth of the annular grooves is 50 microns. The inside of the annular grooves is filled with a liquid metal filling layer. The liquid metal filling layer is a gallium-indium alloy. The gallium-indium alloy is in a liquid flow state above 25°C. An airtight barrier is formed between the upper wall of the lower flange and the lower wall of the step through the liquid metal filling layer.

[0011] Through the above structure, multiple groups of annular grooves form a labyrinthine sealing channel. When the pipeline temperature is greater than 25°C, the gallium-indium alloy melts and fills the micro-texture gaps, forming a metal liquid sealing ring that resists 10MPa water pressure penetration.

[0012] Preferably, the second sealing structure includes a sealing ring, a corrugated metal spring and two groups of annular baffles. The two groups of annular baffles and the sealing ring are arranged in sequence on the inner wall of the sealing cavity in an upper and lower distribution. The corrugated metal spring is arranged between the two groups of annular baffles, and the lower wall of the sealing ring abuts against the upper wall of the lower flange.

[0013] Preferably, the outer wall of the sealing ring is coated with a nanographene coating.

[0014] When the pipeline vibrates violently, the compression deformation of the corrugated metal spring offsets the axial impact force, and the nanographene coating reduces the friction coefficient between the sealing ring and the annular baffle, allowing the sealing ring to maintain sealing surface fit within a displacement range of 0.5mm.

[0015] Preferably, the piezoelectric array structure includes four groups of piezoelectric ceramic sheets, which are equally divided into a circle between the first and second bosses with the axis of the first boss as the middle layer, and the piezoelectric ceramic sheets are connected to the control mainboard via shielded wires.

[0016] Through the above structure, four groups of piezoelectric ceramic sheets form a fully symmetrical sensing array. The pipeline vibration drives the mass block to squeeze the piezoelectric ceramic sheets to generate a charge signal. The circular layout eliminates signal distortion caused by single-point stress concentration.

[0017] Preferably, the locking screw consists of a head and a rod, and a disc-shaped thermal compensation washer is provided on the lower wall of the head and on the outer wall of the rod.

[0018] When the ambient temperature rises, the disc-shaped thermal compensation washer absorbs the thermal expansion difference between the locking screw and the mass block by deformation, maintaining a constant prestress (0.8-1.2MPa) on the piezoelectric ceramic.

[0019] Preferably, the surface of the control main board is sprayed with a nanoporous silica aerogel coating, and the control main board is protected from short circuits caused by condensation at low temperatures by the nanoporous silica aerogel coating.

[0020] Through this coating structure, the hydrophobic micropores of the nanoporous silica aerogel block the penetration of water molecules, maintaining the motherboard surface impedance at >10GΩ when the pipeline temperature drops sharply.

[0021] Preferably, the edge computing module has a built-in ARM Cortex-M7 processor, and the edge computing module distinguishes between water leakage and external environmental vibration interference through a wavelet packet decomposition algorithm and a pre-trained model.

[0022] Through the above structure, the ARM Cortex-M7 processor completes vibration signal feature extraction locally, reducing the data transmission bandwidth requirement.

[0023] Preferably, the first antenna, the second antenna and the third antenna are respectively a near-field antenna, a remote transmission antenna and a Beidou satellite positioning antenna.

[0024] When the device is located in an underground tunnel, the first antenna establishes a Bluetooth connection with the inspection terminal to download parameters; the second antenna uploads alarm data to a base station within 3km via the LoRa protocol; and the third antenna synchronously records the device's geographic coordinates and writes them into the data frame header.

[0025] The present invention provides a noise-based water pipe network leak detection device, which has the following beneficial effects:

[0026] 1. Compared with existing technologies, this noise-based water pipe network leak detection equipment, by collaboratively deploying environmental noise monitoring units and high-frequency signal acquisition units, and using edge computing to run a wavelet packet decomposition algorithm in real time, effectively solves the problem that traditional single-point sensors cannot distinguish between pipeline vibration, water turbulence and the differences in leakage signal spectral characteristics, and improves the accuracy of leakage feature identification by more than 20%.

[0027] 2. Compared with existing technologies, this noise-based water pipe network leak detection equipment solves the signal distortion problem caused by seal failure in humid and corrosive underground environments of existing leak detection instruments through the synergistic effect of laser micro-woven annular grooves, liquid metal seals and composite elastic sealing structures, ensuring that the equipment can maintain stable high-frequency vibration signal acquisition capabilities for a long time under harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a cross-sectional view of the internal structure of the housing of the present invention;

[0030] Figure 3 For the present invention Figure 2 A partial enlarged view of point A in the middle;

[0031] Figure 4 For the present invention Figure 2 A partial enlarged view of point B in the middle;

[0032] Figure 5 For the present invention Figure 2 A partial enlarged view of point C in the middle;

[0033] Figure 6 This is a schematic diagram of the structure of the control box, cover plate and control main board of the present invention;

[0034] Figure 7 It is a partial cross-sectional view of the connection structure between the shell and the step of the present invention.

[0035] Among them, 1. Shell; 101. Step; 2. Upper flange; 3. Lower flange; 301. First boss; 302. Annular groove; 4. Strong magnetic block; 5. First antenna; 6. Second antenna; 7. Third antenna; 8. First accelerometer; 9. Control box; 901. Cover; 902. Control main board; 10. Piezoelectric ceramic piece; 11. Mass block; 1101. Second boss; 1102. Screw hole; 12. Second accelerometer; 13. Liquid metal filling layer; 14. Sealing ring; 15. Annular baffle; 16. Corrugated metal spring; 17. Locking screw; 18. Disc-shaped thermal compensation washer. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example:

[0038] like Figures 1 to 7 As shown, an embodiment of the present invention provides a noise-based water pipe network leak detection device, including a housing 1, an upper flange 2, a lower flange 3, an edge computing module, a communication module, and a mass block 11. The upper flange 2 and the lower flange 3 are respectively threadedly connected to the upper and lower ends of the housing 1;

[0039] In the field of leakage control in urban water supply networks, DMA (District Metered Area) zoning technology has been maturely applied to macro-leakage location (see "Technical Regulations for Leakage Control in Water Supply Networks" T / CUWA 20058-2022). It achieves preliminary judgment of leakage areas by monitoring changes in zone flow and pressure. The device described in the present invention can complement this existing technology. When deployed in a pipe section where DMA zoning has been implemented, leak detection efficiency can be enhanced by: receiving zone flow anomaly alarm signals issued by the DMA system (such as minimum flow exceeding a threshold at night); automatically triggering the wavelet packet decomposition algorithm parameter optimization module to focus the feature extraction frequency band on the high-frequency range of 1-4kHz; uploading vibration feature data to the DMA platform through the communication module for multi-source data fusion analysis;

[0040] This device can achieve high-precision point leak location when operating independently, and can further shorten the leak diagnosis time when working in conjunction with the existing DMA system;

[0041] To ensure stable operation of the core computing unit, a control box 9 is fixedly connected to the inner wall of the housing 1. A cover plate 901 is fixedly connected to the side of the control box 9 facing the center of the housing 1. A control mainboard 902 is fixedly connected to the inner wall of the control box 9. The edge computing module is mounted on the control mainboard 902. The edge computing module has a built-in ARM Cortex-M7 processor and uses a wavelet packet decomposition algorithm and a pre-trained model to distinguish between water leakage and external environmental vibration interference.

[0042] The cover 901 and the control box 9 form an electromagnetic shielding cavity, blocking the interference of pipeline stray current on the control mainboard 902. At the same time, the ARM Cortex-M7 processor completes the vibration signal feature extraction locally, reducing the data transmission bandwidth requirement;

[0043] In order to prevent condensation from causing circuit failure, the surface of the control motherboard 902 is sprayed with a nanoporous silica aerogel coating. The control motherboard 902 is protected from short circuits caused by condensation at low temperatures by the nanoporous silica aerogel coating.

[0044] The hydrophobic micropores of the nanoporous silica aerogel block the penetration of water molecules, maintaining the surface impedance of the control main board 902 > 10GΩ when the pipeline temperature drops sharply;

[0045] To achieve wide-band vibration signal acquisition, a first accelerometer 8 for capturing ambient noise is fixedly connected to the upper wall of the upper flange 2 and located in front of the third antenna 7. A second accelerometer 12 for capturing high-frequency signals is provided on the upper wall of the mass block 11. Both the first accelerometer 8 and the second accelerometer 12 are triaxial MEMS accelerometers with a range of ±200g.

[0046] When a pipeline leaks, the first accelerometer 8 captures the 0-100 Hz low-frequency ambient noise floor, while the second accelerometer 12 simultaneously collects the 100 Hz-8 kHz high-frequency leakage characteristic wave. The dual sensor data are aligned in the time-frequency domain to eliminate the signal phase difference.

[0047] To establish a multi-mode communication link, a first antenna 5 and a second antenna 6 are fixedly connected to the upper wall of the upper flange 2, near the left and right sides, respectively. A third antenna 7 is fixedly connected to the upper wall of the upper flange 2, near the rear side. The first antenna 5, the second antenna 6, and the third antenna 7 are respectively a near-field antenna, a remote transmission antenna, and a Beidou satellite positioning antenna.

[0048] When the device is located in an underground tunnel, the first antenna 5 establishes a Bluetooth connection with the inspection terminal to download parameters; the second antenna 6 uploads alarm data to a base station within 3km via the LoRa protocol; the third antenna 7 synchronously records the device's geographic coordinates and writes them into the data frame header;

[0049] To address the issue of seal failure in the split housing, a step 101 is provided on the lower wall of the housing 1, near the circumferential outer wall of the housing 1. The lower wall of the step 101 abuts against the upper wall of the lower flange 3, and a first sealing structure is provided at the connection. The first sealing structure includes multiple groups of annular grooves 302, which are distributed inwards and outwards and sequentially arranged on the upper wall of the lower flange 3 and are all located on the outer wall of the first boss 301. The multiple groups of annular grooves 302 are formed by laser micro-weaving. The depth of the annular grooves 302 is 50 microns. The interior of the annular grooves 302 is filled with a liquid metal filling layer 13, which is a gallium-indium alloy. The gallium-indium alloy is in a liquid flow state above 25°C. The liquid metal filling layer 13 forms an airtight barrier between the upper wall of the lower flange 3 and the lower wall of the step 101.

[0050] Multiple groups of annular grooves 302 form a labyrinth-type sealing channel. When the pipe temperature is greater than 25°C, the gallium-indium alloy melts and fills the micro-texture gaps, forming a metal liquid sealing ring that resists 10 MPa water pressure penetration.

[0051] To provide dynamic sealing compensation, a sealed cavity is formed between the inner wall of the step 101 and the lower wall of the housing 1. A second sealing structure is provided within the sealed cavity. The second sealing structure includes a sealing ring 14, a corrugated metal spring 16, and two sets of annular baffles 15. The two sets of annular baffles 15 and the sealing ring 14 are arranged in an upper and lower arrangement on the inner wall of the sealed cavity. The corrugated metal spring 16 is arranged between the two sets of annular baffles 15. The lower wall of the sealing ring 14 abuts the upper wall of the lower flange 3, and the outer wall of the sealing ring 14 is coated with a nanographene coating.

[0052] When the pipeline vibrates violently, the corrugated metal spring 16 compresses and deforms to offset the axial impact force. The nanographene coating reduces the friction coefficient between the sealing ring 14 and the annular baffle 15, allowing the sealing ring 14 to maintain sealing surface contact within a 0.5mm displacement range.

[0053] In order to achieve efficient conversion of mechanical vibration into electrical signals, a first boss 301 is provided on the upper wall of the lower flange 3. The outer wall of the first boss 301 is threadedly connected to the inner wall of the shell 1. The mass block 11 is provided on the upper wall of the first boss 301. The lower wall of the mass block 11 is provided with a second boss 1101. A piezoelectric array structure is provided between the second boss 1101 and the first boss 301. The piezoelectric array structure includes four groups of piezoelectric ceramic sheets 10. The four groups of piezoelectric ceramic sheets 10 are all arranged between the first boss 301 and the second boss 1101 in a circular shape with the axis of the first boss 301 as the middle layer. The piezoelectric ceramic sheets 10 are connected to the control mainboard 902 through shielded wires.

[0054] Four groups of piezoelectric ceramic sheets 10 form a fully symmetrical sensing array. The pipeline vibration drives the mass block 11 to squeeze the piezoelectric ceramic sheets 10 to generate a charge signal. The circular layout eliminates signal distortion caused by single-point stress concentration.

[0055] In order to overcome the failure of the preload force caused by temperature deformation, a screw hole 1102 is provided on the inner wall of the mass block 11. A locking screw 17 is provided inside the screw hole 1102. The lower end of the locking screw 17 passes through the screw hole 1102 and is threadedly connected to the upper wall of the first boss 301. The locking screw 17 consists of a head and a rod. A disc-shaped thermal compensation washer is provided on the lower wall of the head and on the outer wall of the rod.

[0056] When the ambient temperature rises, the disc-shaped thermal compensation washer absorbs the thermal expansion difference between the locking screw 17 and the mass block 11 by deformation, maintaining a constant prestress (0.8-1.2 MPa) on the piezoelectric ceramic plate 10.

[0057] A traditional single-point leak detector (comparative example) and the device of the present invention (example) were set on a DN300 cast iron pipe section, and 200 sets of leakage noise samples were continuously collected.

[0058] Comparative example: The recognition accuracy rate confirmed by manual review is 72%;

[0059] Example: Through the edge computing module wavelet packet decomposition algorithm processing, the recognition accuracy rate is increased to 92%;

[0060] Therefore, the accuracy is relatively improved: (92-72) / 72×100% ≈27.8% (rounded to more than 20%).

[0061] Working Principle: This device can achieve high-precision point leak location when operating independently. When working in conjunction with an existing DMA system, it can further shorten leak diagnosis time. The cover plate 901 and the control box 9 form an electromagnetic shielding cavity, blocking the interference of pipeline stray currents on the control motherboard 902. At the same time, the ARM Cortex-M7 processor completes vibration signal feature extraction locally, reducing data transmission bandwidth requirements. The hydrophobic micropores of the nanoporous silica aerogel block the penetration of water molecules, maintaining the surface impedance of the control motherboard 902 greater than 10GΩ when the pipeline temperature drops sharply. When a pipeline leak occurs, the first accelerometer 8 captures the 0-100Hz low-frequency ambient noise floor, and the second accelerometer 12 synchronously collects the 100Hz-8kHz high-frequency leakage characteristic wave. The dual sensor data is aligned in the time and frequency domain to eliminate signal phase differences.

[0062] When the device is located in an underground pipe gallery, the first antenna 5 establishes a Bluetooth connection with the inspection terminal to download parameters; the second antenna 6 uploads alarm data to a base station within 3km via the LoRa protocol; the third antenna 7 synchronously records the device's geographic coordinates and writes them into the data frame header; multiple groups of annular grooves 302 form a labyrinthine sealing channel, and the gallium-indium alloy melts and fills the micro-texture gaps when the pipeline temperature is greater than 25°C, forming a metal liquid sealing ring to resist 10MPa water pressure penetration; when the pipeline vibrates violently, the corrugated metal spring 16 compresses and deforms to offset the axial impact force, and the nanographene coating The friction coefficient between the sealing ring 14 and the annular baffle 15 is reduced layer by layer, so that the sealing ring 14 maintains sealing surface contact within a displacement range of 0.5mm; four groups of piezoelectric ceramic sheets 10 form a fully symmetrical sensing array, and the pipeline vibration drives the mass block 11 to squeeze the piezoelectric ceramic sheets 10 to generate a charge signal. The circumferential layout eliminates signal distortion caused by single-point stress concentration; when the ambient temperature rises, the disc-shaped thermal compensation washer absorbs the thermal expansion difference between the locking screw 17 and the mass block 11 through deformation, maintaining a constant prestress (0.8-1.2MPa) of the piezoelectric ceramic sheet 10.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Noise-based water pipe network leak detection equipment, characterized by: The invention comprises a shell (1), an upper flange (2), a lower flange (3), an edge computing module, a communication module and a mass block (11), wherein the upper flange (2) and the lower flange (3) are respectively threadedly connected to the upper and lower ends of the shell (1), a first antenna (5) and a second antenna (6) are respectively fixedly connected to the upper wall of the upper flange (2) and near the left and right sides, a third antenna (7) is fixedly connected to the upper wall of the upper flange (2) and near the rear side, a first accelerometer (8) for capturing environmental noise is fixedly connected to the upper wall of the upper flange (2) and located in front of the third antenna (7), the inner wall of the shell (1) is fixedly connected to a control box (9), a cover plate (901) is fixedly connected to the side of the control box (9) facing the center of the shell (1), a control mainboard (902) is fixedly connected to the inner wall of the control box (9), and the edge computing module is arranged on the control mainboard (902), a step (101) is provided on the lower wall of the shell (1) and near the circumferential outer wall of the shell (1), and the step (101) is fixedly connected to the inner wall of the control box (9). 01) lower wall is in contact with the upper wall of the lower flange (3), and a first sealing structure is provided at the connection; a sealing cavity is formed between the inner wall of the step (101) and the lower wall of the shell (1); a second sealing structure is provided inside the sealing cavity; a first boss (301) is provided on the upper wall of the lower flange (3); an outer wall of the first boss (301) is threadedly connected to the inner wall of the shell (1); the mass block (11) is provided on the upper wall of the first boss (301); a second boss is provided on the lower wall of the mass block (11); The second boss (1101) and the first boss (301) are provided with a piezoelectric array structure, the inner wall of the mass block (11) is provided with a screw hole (1102), the screw hole (1102) is provided with a locking screw (17) running through it, the lower end of the locking screw (17) passes through the screw hole (1102) and is threadedly connected to the upper wall of the first boss (301), and the upper wall of the mass block (11) is provided with a second accelerometer (12) for capturing high-frequency signals.

2. The noise-based water pipe network leak detection device according to claim 1, characterized in that: The first accelerometer (8) and the second accelerometer (12) are both three-axis MEMS accelerometers, and the range of the first accelerometer (8) and the second accelerometer (12) is ±200g.

3. The noise-based water pipe network leak detection device according to claim 2, characterized in that: The first sealing structure comprises a plurality of groups of annular grooves (302), the plurality of groups of annular grooves (302) being distributed inside and outside and arranged in sequence on the upper wall of the lower flange (3) and all being located on the outer wall of the first boss (301), the plurality of groups of annular grooves (302) being formed by laser micro-weaving, the depth of the annular grooves (302) being 50 microns, the interior of the annular grooves (302) being filled with a liquid metal filling layer (13), the liquid metal filling layer (13) being a gallium-indium alloy, the gallium-indium alloy being in a liquid flow state above 25° C., and an airtight barrier being formed between the upper wall of the lower flange (3) and the lower wall of the step (101) by the liquid metal filling layer (13).

4. The noise-based water pipe network leak detection device according to claim 3, characterized in that: The second sealing structure comprises a sealing ring (14), a corrugated metal spring (16) and two groups of annular baffles (15). The two groups of annular baffles (15) and the sealing ring (14) are sequentially arranged on the inner side wall of the sealing cavity in an upper and lower distribution manner. The corrugated metal spring (16) is arranged between the two groups of annular baffles (15). The lower wall of the sealing ring (14) abuts against the upper wall of the lower flange (3).

5. The noise-based water pipe network leak detection device according to claim 4, characterized in that: The outer wall of the sealing ring (14) is coated with a nanographene coating.

6. The noise-based water pipe network leak detection device according to claim 5, characterized in that: The piezoelectric array structure comprises four groups of piezoelectric ceramic sheets (10), each of the four groups of piezoelectric ceramic sheets (10) being arranged between the first boss (301) and the second boss (1101) in a circularly equally divided manner with the axis of the first boss (301) as the middle layer, and the piezoelectric ceramic sheets (10) are connected to the control mainboard (902) via shielded wires.

7. The noise-based water pipe network leak detection device according to claim 6, characterized in that: The locking screw (17) consists of a head and a rod, and a disc-shaped thermal compensation washer is provided on the lower wall of the head and on the outer wall of the rod.

8. The noise-based water pipe network leak detection device according to claim 7, characterized in that: The surface of the control mainboard (902) is sprayed with a nanoporous silica aerogel coating, and the control mainboard (902) is protected from low-temperature condensation short circuits by the nanoporous silica aerogel coating.

9. The noise-based water pipe network leak detection device according to claim 8, characterized in that: The edge computing module has a built-in ARM Cortex-M7 processor, and uses a wavelet packet decomposition algorithm and a pre-trained model to distinguish between water leakage and external environmental vibration interference.

10. The noise-based water pipe network leak detection device according to claim 9, characterized in that: The first antenna (5), the second antenna (6) and the third antenna (7) are respectively a near-field antenna, a remote transmission antenna and a Beidou satellite positioning antenna.

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