Underground pipeline path detection and leakage point detection method, device, equipment and system

Abstract

The invention discloses an underground pipeline path detection and leakage point detection method. The method comprises the steps that continuous compressed air flow is injected into the starting end of an underground pipeline; collecting a first sound signal in real time, and recording a sound transmission path; identifying an extension path of the underground pipeline so as to detect the path of the underground pipeline; positioning and closing the tail end of the underground pipeline; pulse type compressed air flow is injected into the starting end of the underground pipeline, so that periodic air pressure fluctuation occurs in the underground pipeline; judging whether a second sound signal is captured or not; if yes, judging that a leakage point exists; the second sound signal is collected and processed in real time, and the position of the leakage point is positioned, so that detection of the leakage point is realized; the invention further discloses an underground pipeline path detection and leakage point detection device, equipment, a system and a computer readable storage medium. The signal strength is detected by causing the inner wall of the underground pipeline or the leakage point to send out the first sound signal or the second sound signal, so that the position of the underground pipeline path or the leakage point is positioned.

Description

Technical Field

[0001] This invention relates to the field of pipeline inspection technology, specifically to a method, apparatus, equipment, and system for detecting underground pipeline routes and leak points. Background Technology

[0002] Pipelines are the most commonly used transportation carriers for oil, natural gas, water supply, and chemicals, and are vital infrastructure in people's lives and production. Therefore, pipeline maintenance and repair are of paramount importance. However, existing pipeline leak detection technologies suffer from problems such as low sensitivity, inaccurate location, and complex operation. Therefore, the market urgently needs a high-efficiency, accurate, and easy-to-operate pipeline leak detection device. Summary of the Invention

[0003] To overcome the above-mentioned technical problems, the present invention discloses a method, apparatus, equipment and system for underground pipeline path detection and leak point detection.

[0004] The technical solution adopted by the present invention to achieve the above objectives is as follows: A method for detecting underground pipeline routes and leak points, the method comprising the following steps: Inject a continuous stream of compressed air into the starting end of the underground pipeline; The first sound signal is acquired in real time, and the sound propagation path is recorded; Based on the sound propagation path, the extension path of the underground pipeline is identified to achieve the detection of the underground pipeline path; Locate the end of the underground pipeline based on its extension path. Seal off the end of the underground pipeline; A pulsed compressed air flow is injected into the starting end of the underground pipeline to cause periodic air pressure fluctuations inside the underground pipeline; Determine whether the second sound signal has been captured; If so, then it is determined that there is a leak in the underground pipeline; The second sound signal is collected and processed in real time to locate the leak point and thus detect the leak.

[0005] The above-mentioned method for detecting underground pipeline routes and leak points includes the following steps when injecting a pulsed compressed air flow into the starting end of the underground pipeline: A first air pressure value and a second air pressure value are detected simultaneously at a first time interval, wherein the first air pressure value is the air pressure value at the beginning of the underground pipeline and the second air pressure value is the air pressure value at the end of the underground pipeline. Determine whether the first air pressure value is greater than the second air pressure value; If not, then stop injecting the continuous compressed air stream; If so, continue injecting a continuous stream of compressed air; The first air pressure value is detected at the second time interval; Determine whether the current first air pressure value has reached the first threshold; If not, continue injecting a continuous stream of compressed air; If so, the injection of continuous compressed air flow is stopped, and the first air pressure value is detected again after the second time interval, so as to form periodic air pressure fluctuations inside the underground pipeline.

[0006] An underground pipeline path detection and leak detection device, the device comprising: The first injection unit is used to inject a continuous stream of compressed air into the starting end of the underground pipeline; The first acquisition unit is used to acquire the first sound signal in real time; The first recording unit is used to record the sound propagation path; The first identification unit is used to identify the extension path of the underground pipeline based on the sound propagation path, so as to realize the detection of the underground pipeline path; The first positioning unit is used to locate the end of the underground pipeline according to the extension path of the underground pipeline; The first sealing unit is used to seal the end of the underground pipeline; The second injection unit is used to inject a pulsed compressed air flow into the starting end of the underground pipeline to cause periodic air pressure fluctuations inside the underground pipeline. The first judgment unit is used to determine whether the second sound signal has been captured; The first determination unit is used to determine that there is a leak in the underground pipeline when the first determination unit determines that the second sound signal has been captured. The second acquisition unit is used to acquire the second sound signal in real time; The first processing unit is used to process the second audio signal; The second positioning unit is used to locate the position of the leak point in order to detect the leak point.

[0007] The aforementioned underground pipeline path detection and leak detection device, wherein the second injection unit includes: The first detection unit is used to simultaneously detect a first air pressure value and a second air pressure value at a first time interval, wherein the first air pressure value is the air pressure value at the beginning of the underground pipeline and the second air pressure value is the air pressure value at the end of the underground pipeline. The second judgment unit is used to determine whether the first air pressure value is greater than the second air pressure value; The first stop unit is used to stop the injection of continuous compressed air flow by the first injection unit when the second judgment unit determines that the first air pressure value is not greater than the second air pressure value. The first continuing unit is used to continue injecting a continuous compressed air flow when the second judging unit determines that the first air pressure value is greater than the second air pressure value; The second detection unit is used to detect the first air pressure value according to a second time interval; The third judgment unit is used to determine whether the current first air pressure value has reached the first threshold. The second continuing unit is used to continue injecting a continuous compressed air flow when the third judging unit determines that the current first air pressure value has not reached the first threshold. The second stop unit is used to stop injecting continuous compressed air flow when the third judgment unit determines that the current first air pressure value has reached the first threshold. The first notification unit is used to notify the second detection unit to re-detect the first air pressure value after waiting for the second time interval when the second stop unit stops injecting the continuous compressed air flow, so as to form periodic air pressure fluctuations inside the underground pipeline.

[0008] An underground pipeline path detection and leak detection device, the device comprising a transmitter and a receiver; The transmitter device includes a pressure gauge and a gas injection mechanism, which are detachably connected to an underground pipeline to inject a continuous or pulsed compressed air flow into the underground pipeline to generate a first or second sound signal. The receiver device includes a sensor module, a conditioning circuit, an A / D conversion module, and an embedded system connected in sequence. The embedded system is electrically connected to the conditioning circuit to capture and process the first or second sound signal to achieve path detection or leak detection.

[0009] The aforementioned underground pipeline path detection and leak detection equipment, wherein the gas injection mechanism includes an air pump, a gas storage tank, and a pipe joint, the pipe joint being detachably connected to the starting end of the underground pipeline; The gas storage tank includes an air inlet, an air outlet, and an air exhaust. The air pump is connected to the air inlet. An air outlet valve and an air exhaust valve are respectively provided at the air outlet and the air exhaust, and the air outlet valve is connected to the pipe joint.

[0010] The aforementioned underground pipeline path detection and leak detection equipment, wherein the conditioning circuit includes an electrically connected signal amplification module, a frequency selection module, and a filtering module, the signal amplification module being electrically connected to the sensor module, and the filtering module being electrically connected to the A / D conversion module.

[0011] The aforementioned underground pipeline path detection and leak detection equipment, wherein the embedded system includes an electrically connected MCU, DSP, and RAM, and the A / D conversion module is electrically connected to the MCU.

[0012] An underground pipeline path detection and leak detection system, the system comprising: Memory, used to store computer programs; A processor is used to execute the computer program to implement the underground pipeline path detection and leak detection method described above.

[0013] A computer-readable storage medium storing a program configured to perform the underground pipeline path detection and leak detection method described above.

[0014] The beneficial effects of this invention include the following: (1) Inject a continuous compressed air flow or a pulsed compressed air flow into the underground pipeline to cause the inner wall of the underground pipeline or the leak point to emit the first sound signal or the second sound signal. By detecting the strength of the first sound signal or the second sound signal, the direction of the underground pipeline path or the location of the leak point can be located. (2) A continuous flow of compressed gas is injected into the underground pipeline with the end open. As the continuous compressed air is injected into the underground pipeline, the rapid change in air pressure causes the pipeline to vibrate and emit the first sound signal. The compressed air is finally discharged from the end of the underground pipeline. The first sound signal also propagates along the end of the underground pipeline, thereby identifying and detecting the extension path of the underground pipeline. (3) Injecting pulsed compressed air into an underground pipeline that is closed at the end and has a leak point, the internal air pressure of the underground pipeline undergoes periodic pressure fluctuations due to the injection of pulsed compressed air into the underground pipeline that is closed at the end. The increase in air pressure causes the airflow to be ejected rapidly from the leak point, which causes the leak point to vibrate and emit the second sound signal until the air pressure decreases and the leak point stops emitting air and no longer emits the second sound signal. This causes the leak point to emit the second sound signal periodically, thereby locating and detecting the leak point of the underground pipeline. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1This is a front view schematic diagram of the transmitter device in this invention; Figure 2 This is a schematic diagram of the circuit principle of the receiver device in this invention; Figure 3 This is a schematic diagram illustrating the principle of underground pipeline path detection in this invention; Figure 4 This is a schematic diagram illustrating the principle of underground pipeline leak detection in this invention. Detailed Implementation

[0017] The present invention will be further described below through specific embodiments, so as to make the technical solution of the present invention easier to understand and master, rather than to limit the present invention.

[0018] In this embodiment, unless otherwise specified, all methods used are conventional methods.

[0019] Example: See Figures 3 to 4 This embodiment provides a method for detecting underground pipeline routes and leak points, the method comprising the following steps: A continuous stream of compressed air is injected into the starting end of the underground pipeline; the continuous stream of compressed air is a continuously injected stream of compressed air to increase the air pressure inside the underground pipeline. The system collects a first sound signal in real time and records the sound propagation path. The first sound signal is the sound signal emitted by the vibration caused by the rapid change in internal air pressure of the underground pipeline. The sound propagation path is the direction and location of the first sound signal. As compressed air is continuously injected into the underground pipeline, the rapid change in air pressure causes the pipeline to vibrate and emit the first sound signal. The compressed air is finally discharged from the end of the underground pipeline, and the first sound signal also propagates along the end of the underground pipeline. Based on the sound propagation path, the extension path of the underground pipeline is identified to achieve the detection of the underground pipeline path; Locate the end of the underground pipeline based on its extension path. Seal off the end of the underground pipeline; specifically, a valve can be used to close the end of the underground pipeline. A pulsed compressed air flow is injected into the starting end of the underground pipeline to cause periodic air pressure fluctuations inside the underground pipeline; the pulsed compressed air flow is an intermittently injected compressed air flow to cause the air pressure inside the underground pipeline to repeatedly rise and fall, thus causing periodic air pressure fluctuations. The system determines whether a second sound signal has been captured. The second sound signal is caused by the periodic air pressure fluctuations in the underground pipeline, which is closed at the end and has a leak, causing the leak point to emit a sound signal periodically. As a pulsed compressed air flow is injected into the underground pipeline, which is closed at the end, the air pressure inside the underground pipeline fluctuates periodically. The increase in air pressure causes the airflow to be rapidly ejected from the leak point, causing the leak point to vibrate and emit the second sound signal. This continues until the air pressure decreases and the leak point stops emitting air and no longer emits the second sound signal. This process causes the leak point to emit the second sound signal periodically, and its principle is similar to the sound production principle of a flute. If not, it is determined that there is no leak in the underground pipeline, that is, there is no leak and a second sound signal is emitted; If so, it is determined that there is a leak in the underground pipeline, that is, a second sound signal is emitted when there is a leak. The second sound signal is acquired and processed in real time to locate the leak point and detect it. After the second sound signal is captured, useful signal information is extracted through data processing methods, and then the signal information is converted into leak point location information through a corresponding algorithm.

[0020] Preferably, injecting a pulsed compressed air flow into the starting end of the underground pipeline includes the following steps: The first air pressure value and the second air pressure value are detected simultaneously at a first time interval, wherein the first air pressure value is the air pressure value at the beginning of the underground pipeline and the second air pressure value is the air pressure value at the end of the underground pipeline. The first time interval can be set by the user according to the actual usage. Determine whether the first air pressure value is greater than the second air pressure value; If not, then stop injecting continuous compressed air flow, meaning that the air pressure difference between the beginning and end of the underground pipeline is not significant and there is no leak point; If so, continue to inject a continuous stream of compressed air, meaning that the air pressure at the beginning of the underground pipeline is greater than the air pressure at the end, which means that there may be a leak in the underground pipeline. The first air pressure value is detected at a second time interval; the second time interval can be set according to actual usage. Determine whether the current first air pressure value has reached the first threshold; the first threshold can be set according to the actual usage, and in this embodiment the first threshold is set to 0.4 MPa; If not, continue to inject a continuous stream of compressed air, that is, if the air pressure at the beginning of the underground pipeline is in a low pressure range, continue to inject a continuous stream of compressed air to gradually increase the air pressure. If so, then stop injecting continuous compressed air flow, that is, when the air pressure at the beginning of the underground pipeline is in the high pressure range, stop injecting continuous compressed air flow so that the air pressure gradually decreases; After waiting for the second time interval, the first air pressure value is detected again to create periodic air pressure fluctuations inside the underground pipeline.

[0021] This embodiment also discloses an underground pipeline path detection and leak point detection device, the device comprising: The first injection unit is used to inject a continuous compressed air flow into the starting end of the underground pipeline; the continuous compressed air flow is a continuously injected compressed air flow to increase the air pressure inside the underground pipeline. The first acquisition unit is used to acquire a first sound signal in real time; wherein the first sound signal is the sound signal emitted by the vibration caused by the rapid change in internal air pressure of the underground pipeline. The first recording unit is used to record the sound propagation path; wherein the sound propagation path is the propagation direction and position of the first sound signal; due to the continuous injection of compressed air into the underground pipeline, the rapid air pressure change causes the pipeline to vibrate and emit the first sound signal, and the compressed air is finally discharged from the end of the underground pipeline, and the first sound signal also propagates along the end direction of the underground pipeline. The first identification unit is used to identify the extension path of the underground pipeline based on the sound propagation path, so as to realize the detection of the underground pipeline path; The first positioning unit is used to locate the end of the underground pipeline according to the extension path of the underground pipeline; The first sealing unit is used to seal the end of the underground pipeline; The second injection unit is used to inject a pulsed compressed air flow into the starting end of the underground pipeline to cause periodic air pressure fluctuations inside the underground pipeline; the pulsed compressed air flow is an intermittently injected compressed air flow to cause the air pressure inside the underground pipeline to repeatedly rise and fall, thus causing periodic air pressure fluctuations. The first judgment unit is used to determine whether the second sound signal is captured; wherein, the second sound signal is the sound signal periodically emitted by the leak point caused by the periodic air pressure fluctuation of the underground pipeline with a closed tail end and a leak point. The first determination unit is used to determine that there is a leak in the underground pipeline when the first determination unit determines that the second sound signal is captured. Due to the injection of pulsed compressed air into the underground pipeline with the tail end sealed, the air pressure inside the underground pipeline undergoes periodic pressure fluctuations. The increase in air pressure causes the airflow to be rapidly ejected from the leak point, causing the leak point to vibrate and emit the second sound signal until the air pressure decreases and the leak point stops emitting air and no longer emits the second sound signal. This achieves the effect of causing the leak point to periodically emit the second sound signal, and its principle is similar to the sound production principle of a flute. The second determination unit is used to determine that there is no leak in the underground pipeline when the first determination unit determines that the second sound signal has not been captured. The second acquisition unit is used to acquire the second sound signal in real time; The first processing unit is used to process the second sound signal; after the second sound signal is captured, useful signal information is extracted through data processing methods, and then the signal information is converted into leakage point location information through a corresponding algorithm; The second positioning unit is used to locate the position of the leak point in order to detect the leak point.

[0022] Preferably, the second injection unit includes: The first detection unit is used to simultaneously detect a first air pressure value and a second air pressure value at a first time interval, wherein the first air pressure value is the air pressure value at the beginning of the underground pipeline and the second air pressure value is the air pressure value at the end of the underground pipeline. The first time interval can be set according to actual usage. The second judgment unit is used to determine whether the first air pressure value is greater than the second air pressure value; The first stop unit is used to stop the injection of continuous compressed air flow by the first injection unit when the second judgment unit determines that the first air pressure value is not greater than the second air pressure value, that is, the air pressure difference between the beginning and end of the underground pipeline is not large and there is no leakage point. The first continuing unit is used to continue injecting a continuous compressed air flow when the second judging unit judges that the first air pressure value is greater than the second air pressure value, that is, the air pressure at the beginning of the underground pipeline is greater than the air pressure at the end, which means that there may be a leak in the underground pipeline. The second detection unit is used to detect the first air pressure value at a second time interval; the second time interval can be set according to actual usage. The third judgment unit is used to determine whether the current first air pressure value has reached the first threshold; the first threshold can be set according to the actual use situation, and in this embodiment the first threshold is set to 0.4 MPa; The second continuing unit is used to continue injecting a continuous compressed air flow when the third judgment unit determines that the current first air pressure value has not reached the first threshold. That is, when the air pressure at the beginning of the underground pipeline is in a low air pressure range, a continuous compressed air flow is continued to be injected so that the air pressure gradually increases. The second stop unit is used to stop injecting continuous compressed air flow when the third judgment unit determines that the current first air pressure value has reached the first threshold, that is, when the air pressure at the beginning of the underground pipeline is in the high air pressure range, stop injecting continuous compressed air flow so that the air pressure gradually decreases. The first notification unit is used to notify the second detection unit to re-detect the first air pressure value after waiting for the second time interval when the second stop unit stops injecting the continuous compressed air flow, so as to form periodic air pressure fluctuations inside the underground pipeline.

[0023] See Figures 1 to 2 The present invention also discloses an underground pipeline path detection and leak detection device, the device comprising a transmitter device and a receiver device; The transmitter device includes a pressure gauge 11 and a gas injection mechanism, which are detachably connected to an underground pipeline to inject a continuous or pulsed compressed air flow into the underground pipeline to generate a first or second sound signal. The receiver device includes a sensor module, a conditioning circuit, an A / D conversion module, and an embedded system connected in sequence. The embedded system is electrically connected to the conditioning circuit to capture and process the first or second sound signal to achieve path detection or leak detection.

[0024] Specifically, the transmitter device injects compressed air into the underground pipeline through the gas injection mechanism, causing the inner wall of the underground pipeline or the leak point to emit the first sound signal or the second sound signal. The receiver device located on the ground detects the strength of the first sound signal or the second sound signal to locate the direction of the underground pipeline or the location of the leak point.

[0025] Preferably, the gas injection mechanism includes an air pump 12, a gas storage tank 13, and a pipe joint 14, wherein the pipe joint 14 is detachably connected to the starting end of the underground pipeline; the air pump 12 converts low-pressure gas into high-pressure gas and stores it in the gas storage tank 13; The air storage tank 13 includes an air inlet, an air outlet, and an exhaust outlet. The air pump 12 is connected to the air inlet. An air outlet valve 15 and an exhaust valve 16 are respectively provided at the air outlet and exhaust outlet, and the air outlet valve 15 is connected to the pipe joint 14.

[0026] Specifically, the sensor module employs a high-sensitivity sound sensor to locate the underground pipeline by capturing the first sound signal emitted by the underground pipeline.

[0027] Specifically, the conditioning circuit includes a signal amplification module, a frequency selection module, and a filtering module that are electrically connected. The signal amplification module is electrically connected to the sensor module, and the filtering module is electrically connected to the A / D conversion module. The main function of the conditioning circuit is to receive the first sound signal or the second sound signal at a specific frequency and to filter the first sound signal or the second sound signal to obtain the target analog signal.

[0028] Specifically, the A / D conversion module converts the preprocessed analog signal into a digital signal, and transmits the digital signal in binary code to the embedded system for processing.

[0029] Specifically, the embedded system includes an electrically connected MCU, DSP, and RAM, and the A / D conversion module is electrically connected to the MCU. The embedded system is the core of processing, execution, calculation, operation, and control, and has excellent performance and low power consumption characteristics. It can support complex algorithms, high-speed processing, and multi-tasking capabilities, and can meet many different application requirements.

[0030] Specifically, the principle of underground pipeline path detection is as follows: the end of the underground pipeline to be detected is open, the air pump 12 works to inject a continuous flow of compressed air, at this time the air pressure at the beginning and end of the underground pipeline is the same, and the air pressure gauge 11 detects that the air pressure hardly rises, the air outlet valve 15 is closed to allow the air pressure inside the air storage tank 13 to rise, when the air pressure rises to the second threshold, the air outlet valve 15 is opened, at this time the continuous compressed gas is injected into the underground pipeline, due to the continuous injection of compressed air into the underground pipeline, the rapid air pressure change causes the pipeline to vibrate and emit the first sound signal, the compressed air is finally discharged from the end of the underground pipeline, and the first sound signal also propagates along the end direction of the underground pipeline, wherein the second threshold can be set by itself according to the actual use situation, in this embodiment the second threshold is set to 0.4Mpa; The sensor module captures the first sound signal, the conditioning circuit filters the first sound signal to obtain an analog signal, the A / D conversion module converts the pre-processed analog signal into a digital signal, and transmits the digital signal in binary code to the embedded system for processing to obtain the location and extension path of the underground pipeline, thereby realizing the detection of the underground pipeline path.

[0031] Specifically, the principle of underground pipeline leak detection is as follows: the end of the underground pipeline to be tested is sealed, the air pump 12 operates to inject a continuous flow of compressed air. At this time, the air pressure at the beginning of the underground pipeline is greater than the air pressure at the end, and the pressure gauge 11 detects the rise in air pressure. The compressed air flow continues to be injected. When the air pressure rises to the first threshold, the air pump 12 stops working, the exhaust valve 16 is opened to release the air pressure, and the above operation is repeated so that the air pressure inside the underground pipeline rises and falls periodically, ultimately causing the leak point to periodically emit the second sound signal. The first threshold can be set according to the actual use. In this embodiment, the first threshold is set to 0.4 MPa. The sensor module captures the second sound signal, the conditioning circuit filters the second sound signal to obtain an analog signal, and the A / D conversion module converts the pre-processed analog signal into a digital signal and transmits the digital signal in binary code to the embedded system for processing to determine the location of the leak point and realize the detection of the leak point location.

[0032] This embodiment also discloses an underground pipeline path detection and leak point detection system, the system comprising: Memory, used to store computer programs; A processor is used to execute the computer program to implement the underground pipeline path detection and leak detection method described above.

[0033] This embodiment also discloses a computer-readable storage medium storing a program configured to execute the underground pipeline path detection and leak point detection method described above.

[0034] The method for underground pipeline path detection and leak point detection of the present invention has the following advantages: (1) Inject a continuous compressed air flow or a pulsed compressed air flow into the underground pipeline to cause the inner wall of the underground pipeline or the leak point to emit the first sound signal or the second sound signal. By detecting the strength of the first sound signal or the second sound signal, the direction of the underground pipeline path or the location of the leak point can be located. (2) A continuous flow of compressed gas is injected into the underground pipeline with the end open. As the continuous compressed air is injected into the underground pipeline, the rapid change in air pressure causes the pipeline to vibrate and emit the first sound signal. The compressed air is finally discharged from the end of the underground pipeline. The first sound signal also propagates along the end of the underground pipeline, thereby identifying and detecting the extension path of the underground pipeline. (3) Injecting pulsed compressed air into an underground pipeline that is closed at the end and has a leak point, the internal air pressure of the underground pipeline undergoes periodic pressure fluctuations due to the injection of pulsed compressed air into the underground pipeline that is closed at the end. The increase in air pressure causes the airflow to be ejected rapidly from the leak point, which causes the leak point to vibrate and emit the second sound signal until the air pressure decreases and the leak point stops emitting air and no longer emits the second sound signal. This causes the leak point to emit the second sound signal periodically, thereby locating and detecting the leak point of the underground pipeline.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention, using the disclosed technical means and content. Therefore, all equivalent changes made based on the shape, structure, and principle of the present invention without departing from the scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for detecting underground pipeline routes and leak points, characterized in that, The method includes the following steps: Inject a continuous stream of compressed air into the starting end of the underground pipeline; The first sound signal is acquired in real time, and the sound propagation path is recorded; Based on the sound propagation path, the extension path of the underground pipeline is identified to achieve the detection of the underground pipeline path; Locate the end of the underground pipeline based on its extension path. Seal off the end of the underground pipeline; A pulsed compressed air flow is injected into the starting end of the underground pipeline to cause periodic air pressure fluctuations inside the underground pipeline; Determine whether the second sound signal has been captured; If so, then it is determined that there is a leak in the underground pipeline; The second sound signal is collected and processed in real time to locate the leak point and thus detect the leak.

2. The method for detecting underground pipeline routes and leak points according to claim 1, characterized in that, When injecting a pulsed compressed air flow into the starting end of the underground pipeline, the following steps are included: A first air pressure value and a second air pressure value are detected simultaneously at a first time interval, wherein the first air pressure value is the air pressure value at the beginning of the underground pipeline and the second air pressure value is the air pressure value at the end of the underground pipeline. Determine whether the first air pressure value is greater than the second air pressure value; If not, then stop injecting the continuous compressed air stream; If so, continue injecting a continuous stream of compressed air; The first air pressure value is detected at the second time interval; Determine whether the current first air pressure value has reached the first threshold; If not, continue injecting a continuous stream of compressed air; If so, the injection of continuous compressed air flow is stopped, and the first air pressure value is detected again after the second time interval, so as to form periodic air pressure fluctuations inside the underground pipeline.

3. A device for detecting underground pipeline routes and leak points, characterized in that, The device includes: The first injection unit is used to inject a continuous stream of compressed air into the starting end of the underground pipeline; The first acquisition unit is used to acquire the first sound signal in real time; The first recording unit is used to record the sound propagation path; The first identification unit is used to identify the extension path of the underground pipeline based on the sound propagation path, so as to realize the detection of the underground pipeline path; The first positioning unit is used to locate the end of the underground pipeline according to the extension path of the underground pipeline; The first sealing unit is used to seal the end of the underground pipeline; The second injection unit is used to inject a pulsed compressed air flow into the starting end of the underground pipeline to cause periodic air pressure fluctuations inside the underground pipeline. The first judgment unit is used to determine whether the second sound signal has been captured; The first determination unit is used to determine that there is a leak in the underground pipeline when the first determination unit determines that the second sound signal has been captured. The second acquisition unit is used to acquire the second sound signal in real time; The first processing unit is used to process the second audio signal; The second positioning unit is used to locate the position of the leak point in order to detect the leak point.

4. The underground pipeline path detection and leak point detection device according to claim 3, characterized in that, The second injection unit includes: The first detection unit is used to simultaneously detect a first air pressure value and a second air pressure value at a first time interval, wherein the first air pressure value is the air pressure value at the beginning of the underground pipeline and the second air pressure value is the air pressure value at the end of the underground pipeline. The second judgment unit is used to determine whether the first air pressure value is greater than the second air pressure value; The first stop unit is used to stop the injection of continuous compressed air flow by the first injection unit when the second judgment unit determines that the first air pressure value is not greater than the second air pressure value. The first continuing unit is used to continue injecting a continuous compressed air flow when the second judging unit determines that the first air pressure value is greater than the second air pressure value; The second detection unit is used to detect the first air pressure value according to a second time interval; The third judgment unit is used to determine whether the current first air pressure value has reached the first threshold. The second continuing unit is used to continue injecting a continuous compressed air flow when the third judging unit determines that the current first air pressure value has not reached the first threshold. The second stop unit is used to stop injecting continuous compressed air flow when the third judgment unit determines that the current first air pressure value has reached the first threshold. The first notification unit is used to notify the second detection unit to re-detect the first air pressure value after waiting for the second time interval when the second stop unit stops injecting the continuous compressed air flow, so as to form periodic air pressure fluctuations inside the underground pipeline.

5. An underground pipeline path detection and leak detection device, characterized in that, The device includes a transmitter and a receiver. The transmitter device includes a pressure gauge and a gas injection mechanism, which are detachably connected to an underground pipeline to inject a continuous or pulsed compressed air flow into the underground pipeline to generate a first or second sound signal. The receiver device includes a sensor module, a conditioning circuit, an A / D conversion module, and an embedded system connected in sequence. The embedded system is electrically connected to the conditioning circuit to capture and process the first or second sound signal to achieve path detection or leak detection.

6. The underground pipeline path detection and leak point detection equipment according to claim 5, characterized in that, The gas injection mechanism includes an air pump, a gas storage tank, and a pipe joint, the pipe joint being detachably connected to the starting end of the underground pipeline; The gas storage tank includes an air inlet, an air outlet, and an air exhaust. The air pump is connected to the air inlet. An air outlet valve and an air exhaust valve are respectively provided at the air outlet and the air exhaust, and the air outlet valve is connected to the pipe joint.

7. The underground pipeline path detection and leak point detection equipment according to claim 5, characterized in that, The conditioning circuit includes a signal amplification module, a frequency selection module, and a filtering module that are electrically connected. The signal amplification module is electrically connected to the sensor module, and the filtering module is electrically connected to the A / D conversion module.

8. The underground pipeline path detection and leak point detection equipment according to claim 5, characterized in that, The embedded system includes an electrically connected MCU, DSP, and RAM, and the A / D conversion module is electrically connected to the MCU.

9. A system for detecting underground pipeline routes and leak points, characterized in that, The system includes: Memory, used to store computer programs; A processor is used to execute the computer program to implement the underground pipeline path detection and leak point detection method as described in claim 1 or 2.

10. A computer-readable storage medium, characterized in that, The system contains a program configured to perform the underground pipeline path detection and leak detection method as described in claim 1 or 2.

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