Listening device for pipeline leakage detection

Abstract

The invention provides a pipeline leakage detection listening device, which comprises a pickup rod, a steering gear, a sound transmission rod, an analysis terminal and an earphone, and is characterized in that the sound transmission rod is fixedly connected with the steering gear, the pickup rod is rotatably connected with the steering gear, the earphone is electrically connected with the analysis terminal, and the pickup rod comprises a pickup sensor; the analysis terminal is configured to receive the audio acquired by the pickup rod, analyze the audio, generate a sound spectrum and a dynamic schematic diagram of the virtual pipeline and display the sound spectrum and the dynamic schematic diagram; the analysis terminal is used for carrying out noise reduction processing on an original audio, and splitting the original audio after noise reduction into a plurality of frequency divisions according to a preset frequency interval; screening a target frequency division which is not adaptive to the known frequency spectrum from the plurality of frequency divisions, and if the target frequency division is not found, displaying that leakage does not occur; and finally calculating the position or direction of the leakage point and the distance between the leakage point and the detection point. According to the invention, a wider detection range is taken into account, the limitation of noise interference and users is broken through, and the detection accuracy and practicability of the detection listening device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline detection equipment, and in particular to a pipeline leakage detection listening device. Background Art

[0002] The pipe listening device is an existing device for detecting pipeline leakage. It uses the propagation characteristics of sound in a confined space. After the film on the head of the listening device contacts the surface of the pipeline, the sound is converted into mechanical vibration, and the vibration effect is transmitted, and finally the sound is obtained by the inspector. Common listening devices generally include a listening end that contacts the listener's ear and a pickup end that contacts the pipeline. Between the pickup end and the listening end is a metal rod-shaped structure that conducts sound. This listening device mainly relies on the listener's experience to obtain the location of the leak in multiple tests. The general public cannot distinguish between the sound of flowing water and the sound of leaking water, which makes it difficult to determine the leak point, that is, there is a limitation on the user group; in addition, it needs to be detected clearly in a relatively quiet environment, that is, there is a defect of noise interference detection; and the pickup end of the detection needs to be in a straight line with the listening end, that is, the detection equipment cannot take into account the detection of special positions, that is, there is a limitation that it cannot take into account a wider detection range. For pipeline leakage detection equipment, it is urgent to solve these technical problems in order to optimize the detection equipment and improve the accuracy and practicality of leakage detection. Summary of the invention

[0003] An embodiment of the present invention provides a pipeline leakage detection listening device, which is used to solve the relevant technical problems in the aforementioned background technology, so as to optimize the detection equipment and improve the accuracy and practicality of leakage detection.

[0004] The present invention provides a pipeline leakage detection listening device, comprising a sound pickup rod, a deflector, a sound transmission rod, an analysis terminal, and an earphone, wherein the sound transmission rod is fixedly connected to the deflector, the sound pickup rod and the deflector are rotatably connected, the earphone and the analysis terminal are electrically connected, and the sound pickup end of the sound pickup rod comprises a sound pickup sensor; The analysis terminal is configured to receive and analyze the audio acquired by the pickup rod, and generate and display a dynamic schematic diagram of a sound spectrum and a virtual pipeline; The analyzing terminal analyzing the audio includes: Obtain the original audio of the detection point and perform noise reduction processing on it to remove the noise spectrum with preset characteristics; Splitting the original audio after noise reduction according to preset frequency intervals to obtain a first frequency division, a second frequency division, and a third frequency division; According to the preset spectrum, the known spectrum is screened from the first frequency division, the second frequency division and the third frequency division, and a target frequency division that is not compatible with the known spectrum is determined, and the period T and amplitude Q of the target frequency division are obtained; if the target frequency division is not found, it is displayed that there is no leakage; Calculate at least two detection points along the pipeline direction, determine the position or direction of the leakage point according to the amplitude Q of different detection points, and calculate the distance of the leakage point relative to the detection point according to the period T of different detection points.

[0005] Optionally, the diverter includes: a bolt, two nested and relatively movable sound-receiving spheres, an upper shell, a lower shell, and interfaces respectively arranged on the sides of the upper shell and the lower shell, the interface is in contact with the sound-receiving sphere, the upper shell and the lower shell are closed to each other after passing through the bolt, and the sound-receiving sphere is arranged in a cavity formed by the closure of the upper shell and the lower shell; the interface is used to dock with the sound pickup rod and the sound transmission rod respectively.

[0006] Optionally, a regulating valve is further included, wherein the regulating valve is passed through the bolt, one end of the regulating valve is connected to one of the sound-receiving spheres, and the regulating valve is rotated to control the interface of the upper shell and the interface of the lower shell to move closer to or farther away from each other.

[0007] Optionally, the pickup end of the pickup rod is provided with a magnetic coating.

[0008] Optionally, the surface of the sound pickup rod other than the sound pickup end is wrapped with self-luminous fibers.

[0009] Optionally, the sound pickup end of the sound pickup rod further includes an imaging device, and the imaging device is signal-connected to the analysis terminal.

[0010] Optionally, the earphone includes a noise reduction layer, the noise reduction layer is covered outside the auricle, and the noise reduction layer is made of rubber material; the sound receiving sphere is made of aluminum alloy.

[0011] Optionally, the pickup rod further includes a shielding cover near the end thereof, and an accordion sealing tube is provided at the point where the bottom end of the shielding cover contacts the pipe.

[0012] Optionally, an audio amplifier is provided in the analysis terminal, and an output end of the audio amplifier is connected to the earphone.

[0013] Optionally, the analysis terminal also includes a USB interface or a network interface, and the USB interface or the network interface is used to connect to the digital monitoring equipment through the smart pipe network GIS system.

[0014] The beneficial effects of the present invention are: 1) The diverter makes the pickup end more flexible, breaking through the limitation of the existing technology that cannot take into account more detection ranges; 2) By processing the audio, noise is removed, so that even if there is noise in the detection environment, normal detection will not be affected, breaking through the limitation of existing technologies that cannot break through noise interference; 3) The present invention makes the detection effect more accurate by intelligently analyzing the audio, breaking through the dependence on the listener's detection experience during manual detection, that is, breaking through the limitation of the user group; 4) The magnetic coating of the pickup rod allows the pickup rod to be adsorbed on valve plugs or iron-containing pipes, ensuring that the pickup rod can stably collect audio and improve the practicality of the pickup device; 5) The pickup rod is equipped with self-luminous fiber and imaging equipment, so that the pickup rod can collect data in a dark environment, which is convenient for the inspector to check the position and direction of the pipeline in the dark environment, and improves the visualization of the dark environment and the practicality of the listening detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram showing the structure of a pipeline leakage detection listening device provided in an embodiment of the present application; Figure 2 A schematic diagram showing the analysis principle of the terminal and the analysis principle of the audio in this application; Figure 3 A front schematic diagram of a steering gear in an embodiment of the present application is shown.

[0016] In the figure: 1: pickup rod; 11: shielding cover; 2: Steering gear; 21: Upper housing; 22: Lower housing; 23: Regulating valve; 3: Sound transmission rod; 4: Analysis terminal; 5: Headphones. DETAILED DESCRIPTION

[0017] The technical solutions in the application embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the application embodiments. In addition, the phrases "in one embodiment" or "in an embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable manner.

[0018] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0019] The pipe listening device is an existing device for detecting pipe leaks. It uses the propagation characteristics of sound in a confined space. After the film on the head of the listening device contacts the pipe surface, the sound is converted into mechanical vibration, and the vibration effect is propagated, and finally the sound is captured by the inspector. Since the characteristics of the sound at the leak point are different from those at the non-leak point, the frequency of the leakage is usually below 2000Hz, while the range that the human ear can hear is 20Hz~20kHz, so the leak detector can find the location of the leak. However, in actual projects, due to the diversity and complexity of the operating conditions of underground media and water supply pipelines, the listening effect is often affected, because the sound signal generated by the leakage can often only be recognized by experienced leak detectors.

[0020] Common listening devices generally include a listening end that contacts the listener's ear, a sound pickup end that contacts the pipe, and a metal rod-shaped structure that conducts sound between the sound pickup end and the listening end. This type of listening device mainly relies on the listener's experience to obtain the location of the leak in multiple tests. Most people cannot distinguish between the sound of flowing water and the sound of leaking water, which makes it difficult to determine the leak point, that is, it has limitations on the user population; in addition, it requires a relatively quiet environment to be clearly detected, that is, there is a defect of noise interfering with the detection; and the detection pickup end needs to be in a straight line with the listening end, that is, the detection equipment cannot take into account the detection of special positions, that is, it has the limitation of not being able to take into account a wider detection range. Therefore, the present invention proposes a pipeline leak detection listening device to solve the above-mentioned technical problems.

[0021] The present invention will be described in detail below: Please refer to Figures 1 to 3 The present invention provides a pipeline leakage detection listening device, comprising a sound pickup rod 1, a deflector 2, a sound transmission rod 3, an analysis terminal 4, and an earphone 5, wherein the sound transmission rod 3 is fixedly connected to the deflector 2, the sound pickup rod 1 is rotatably connected to the deflector 2, the earphone 5 is electrically connected to the analysis terminal 4, and the sound pickup end of the sound pickup rod 1 comprises a sound pickup sensor; The analysis terminal 4 is configured to receive and analyze the audio acquired by the sound pickup rod 1, and generate and display a dynamic schematic diagram of a sound spectrum and a virtual pipeline; The analysis terminal 4 analyzes the audio including: Obtain the original audio of the detection point and perform noise reduction processing on it to remove the noise spectrum of the preset characteristics; Splitting the original audio after noise reduction according to preset frequency intervals to obtain a first frequency division, a second frequency division, and a third frequency division; According to the preset spectrum, the known spectrum is screened from the first frequency division, the second frequency division and the third frequency division, and a target frequency division that is not compatible with the known spectrum is determined, and the period T and amplitude Q of the target frequency division are obtained; if the target frequency division is not found, it is displayed that there is no leakage; Calculate at least two detection points along the pipeline direction, determine the position or direction of the leakage point according to the amplitude Q of different detection points, and calculate the distance of the leakage point relative to the detection point according to the period T of different detection points.

[0022] like Figure 1 As shown, the detection listening device provided by the present invention includes a sound pickup rod 1 for contacting with the detection pipeline or the detection surface, and a deflector 2 is arranged at the other end of the sound pickup rod 1, and the sound transmission rod 3 is connected with the sound pickup rod 1 through the deflector 2. By setting the deflector 2, the angle between the sound pickup rod 1 and the sound transmission rod 3 can be easily adjusted, thereby increasing the flexibility of the sound pickup rod 1, and facilitating the penetration of smaller or other detection spaces that cannot be directly entered, so as to break through the limitation that the prior art cannot take into account more detection ranges. Then the sound transmission rod 3 transmits the detection audio obtained by the sound pickup rod 1 to the analysis terminal 4, and the analysis terminal 4 analyzes the audio and generates a sound spectrum and a virtual pipeline dynamic map, wherein the sound spectrum facilitates the detector to intuitively observe the detected audio, and the virtual pipeline dynamic map facilitates the detector to judge the leakage point and the water flow parameters of the pipeline, etc. The present invention realizes intelligent analysis of audio, making the detection effect more accurate, breaking through the dependence on the listener's detection experience during manual detection, that is, breaking through the limitation of the user population.

[0023] For details, see Figure 2 As shown, the analysis principle and analysis method of the analysis terminal 4 are explained here: Taking two detection points as an example, namely detection point A and detection point B in the figure, the analysis terminal 4 obtains the original detection audio of detection point A and detection point B respectively, and then removes the noise in the two original audios. The principle of noise removal is to compare with the noise spectrum of the preset characteristics, so as to identify which audio belongs to the noise, and then strip it and delete it. Among them, the noise spectrum of the preset characteristics includes: human voice, only one sound, and those spectra without a certain period. After removing these noises, only the audio with a specific period related to the pipe water flow is left.

[0024] Then, the audio after noise removal is split into the first frequency division, the second frequency division or the third frequency division according to the preset frequency range. Because the amplitudes of the normal sound of flowing water and the sound of leaking water in the spectrum diagram are different, and the periods are also different, according to these differences, the audio is split into two or more frequency divisions, and the frequency intervals of different frequency divisions are different. By comparing the multiple frequency divisions after splitting with the known spectrum, it can be determined whether there is a frequency division in the frequency division that is compatible with the known spectrum. If there is, it means there is a leak, and the frequency division is the target frequency division generated by the leak. If not, it means that there is no leak within the detection range of the detection point. Among them, the aforementioned known spectrum is the spectrum of normal water flow in the known pipeline, which is related to the actual parameters of the pipeline such as material, flow rate, water delivery, etc., and can be entered in advance before detection.

[0025] The last step is to calculate based on the analysis results. The calculation process includes the location of the leak point, the direction of the leak point relative to the detection point, and the distance of the leak point relative to the detection point. The principle of the above calculation process is: First, the calculation of the leakage point location or direction: Because the amplitude Q of the first frequency divider, the second frequency divider or the third frequency divider after the audio detected at each detection point is split is different, if there is a target frequency divider and there is an amplitude difference between the target frequency divider and the two detection points, it means that one of the two detection points is close to the leakage point and the other is far away from the leakage point. The leakage point is in the direction from the detection point with smaller amplitude to the detection point with larger amplitude. Therefore, the direction or position of the leakage point relative to the detection point can be known based on the distance relationship.

[0026] Second, the distance between the leakage point and the detection point is calculated: Because the period T of the target frequency division in each detection point is different, the difference in the period corresponds to the distance between the two detection points. The distance between the two detection points can be obtained by using the relationship between the sound propagation speed, time, and distance. Then, the distance relationship corresponding to one period can be known based on the proportional relationship. Based on this, the distance relationship between the leakage point and each detection point can be estimated, and then the distance of the leakage point relative to the detection point can be known.

[0027] Among them, Figure 3 As shown, the aforementioned diverter 2 comprises: a bolt, two nested relatively movable sound-receiving spheres, an upper shell 21, a lower shell 22, and interfaces respectively arranged on the sides of the upper shell 21 and the lower shell 22, the interfaces are in contact with the sound-receiving sphere, the upper shell 21 and the lower shell 22 are closed to each other after passing through the bolt, the sound-receiving sphere is arranged in a cavity formed by the closing of the upper shell 21 and the lower shell 22; the interfaces are respectively used to dock with the sound pickup rod 1 and the sound transmission rod 3. It also comprises a regulating valve 23, the regulating valve 23 is passed through the bolt, one end of the regulating valve 23 is connected to one of the sound-receiving spheres, and the regulating valve 23 is rotated to control the interface of the upper shell 21 and the interface of the lower shell 22 to approach or move away from each other.

[0028] As described above, the two nested sound-receiving balls are respectively connected to the sound pickup rod 1 and the sound transmission rod 3 to guide the audio from the sound pickup rod 1 to the sound transmission rod 3 and finally to the analysis terminal 4. The sound-receiving ball, the sound pickup rod 1 and the sound transmission rod 3 are all made of aluminum alloy, which not only reduces the attenuation of the sound transmission process, but also is light and easy to use. The regulating valve 23 can be manually controlled or automatically controlled, that is, the regulating valve 23 can be manually rotated to adjust the angle between the sound pickup rod 1 and the sound transmission rod 3, and an automatic regulating valve 23 can also be set to automatically control the angle between the sound pickup rod 1 and the sound transmission rod 3. This embodiment does not make specific limitations on this.

[0029] The diverter 2 provided in this embodiment can play its unique advantages whether it is used for leak detection inside narrow and tortuous pipelines, in building structures with complex spatial layouts, or in outdoor environments with rugged terrain and many obstacles. When the pipeline has a changeable direction and the listening rod needs to be accurately detected along the pipeline at different angles, the diverter 2 can easily adjust and rotate at multiple angles, allowing the listening rod to quickly adapt to changes in the pipeline and accurately capture possible leakage sound signals. It provides strong technical support for ensuring the safe operation of the pipeline system and the rational use of water resources.

[0030] In some embodiments, the pickup end of the pickup rod 1 is provided with a magnetic coating. The surface of the pickup rod 1 other than the pickup end is wrapped with self-luminous fibers.

[0031] In this embodiment, the magnetic coating of the sound pickup rod 1 allows the sound pickup rod 1 to be adsorbed on a valve plug or a pipe containing iron components, ensuring that the sound pickup rod 1 can stably collect audio and improve the practicality of the sound pickup device; in addition, the sound pickup rod 1 is provided with an autonomous luminous fiber and an imaging device, so that the sound pickup rod 1 can collect audio in a dark environment, making it convenient for the inspector to view the position and direction of the pipe in the dark environment, thereby improving the visualization of the dark environment and the practicality of the listening detection device.

[0032] In some embodiments, the analysis terminal 4 is provided with an audio amplifier, and the output end of the audio amplifier is connected to the earphone 5. The earphone 5 includes a noise reduction layer, which is covered outside the auricle and made of rubber material; the sound receiving sphere is made of aluminum alloy. In this embodiment, the audio amplifier is convenient for controlling the volume of the detected audio, which is convenient for the tester to listen and distinguish. In addition, the noise reduction layer made of rubber material can effectively reduce the noise around the listener when listening, and improve the practicality of the detection listening device.

[0033] like Figure 1 As shown, in some embodiments, the pickup rod 1 further includes a shielding cover 11 near the end, and an organ sealing tube is provided at the bottom of the shielding cover 11 where it contacts the pipe. The shielding cover 11 separates the outside world from the pickup end of the pickup rod 1, reduces the noise captured by the pickup rod 1, and reduces the complexity of the frequency division. In addition, the analysis terminal 4 also includes a USB interface or a network interface, and the USB interface or the network interface is used to connect to the digital monitoring device through the smart pipe network GIS system. Connecting the analysis terminal 4 to the external digital monitoring device through the interface makes it convenient for the monitor to monitor multiple detection devices on a unified monitoring device, further improving the practicality of the detection listening device.

[0034] It should be noted that, in this embodiment, the aforementioned network interface type and digital monitoring equipment are not specifically limited and can be adjusted according to actual adaptability.

[0035] Finally, the present invention provides a pipeline leakage detection listening device, including a sound pickup rod 1, a steering gear 2, a sound transmission rod 3, an analysis terminal 4, and an earphone 5. The sound transmission rod 3 is fixedly connected to the steering gear 2, the sound pickup rod 1 is rotatably connected to the steering gear 2, the earphone 5 is electrically connected to the analysis terminal 4, and the sound pickup end of the sound pickup rod 1 includes a sound pickup sensor; the analysis terminal 4 is configured to receive the audio acquired by the sound pickup rod 1 and then analyze it, and generate a sound spectrum and a dynamic schematic diagram of the virtual pipeline and then display it; wherein the analysis terminal 4 analyzes the audio including: denoising the original audio, splitting the original audio after denoising according to a preset frequency interval, and obtaining a first frequency division, a second frequency division, and a third frequency division; screening a known frequency spectrum from multiple frequency divisions and determining a target frequency division that is not compatible with the known frequency spectrum, and displaying no leakage if the target frequency division is not found; calculating the position or direction of the leakage point, and calculating the distance of the leakage point relative to the detection point. The present invention takes into account more detection ranges, breaks through the limitations of noise interference and user groups, and improves the detection accuracy and practicality of the detection listening device.

[0036] It should be noted that the above embodiments all belong to the same inventive concept, and the descriptions of the embodiments have different focuses. For the parts not described in detail in the individual embodiments, reference can be made to the descriptions in other embodiments. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0037] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pipeline leakage detection listening device, characterized in that: The invention comprises a sound pickup rod (1), a deflector (2), a sound transmission rod (3), an analysis terminal (4), and an earphone (5); the sound transmission rod (3) is fixedly connected to the deflector (2); the sound pickup rod (1) is rotatably connected to the deflector (2); the earphone (5) is electrically connected to the analysis terminal (4); and the sound pickup end of the sound pickup rod (1) comprises a sound pickup sensor; The analysis terminal (4) is configured to receive and analyze the audio acquired by the pickup rod (1), and to generate and display a dynamic schematic diagram of a sound spectrum and a virtual pipeline; The analysis terminal (4) analyzing the audio includes: Obtain the original audio of the detection point and perform noise reduction processing on it to remove the noise spectrum with preset characteristics; Splitting the original audio after noise reduction according to preset frequency intervals to obtain a first frequency division, a second frequency division, and a third frequency division; According to the preset spectrum, the known spectrum is screened from the first frequency division, the second frequency division and the third frequency division, and a target frequency division that is not compatible with the known spectrum is determined, and the period T and amplitude Q of the target frequency division are obtained; if the target frequency division is not found, it is displayed that there is no leakage; Calculate at least two detection points along the pipeline direction, determine the position or direction of the leakage point according to the amplitude Q of different detection points, and calculate the distance of the leakage point relative to the detection point according to the period T of different detection points.

2. The pipeline leakage detection listening device according to claim 1, characterized in that: The diverter (2) comprises: a bolt, two nested sound-receiving spheres that can move relatively, an upper shell (21), a lower shell (22), and interfaces respectively arranged on the sides of the upper shell (21) and the lower shell (22); the interfaces are in contact with the sound-receiving sphere; the upper shell (21) and the lower shell (22) are closed to each other after passing through the bolt; the sound-receiving sphere is arranged in a cavity formed by the closure of the upper shell (21) and the lower shell (22); the interfaces are respectively used to dock with the sound pickup rod (1) and the sound transmission rod (3).

3. The pipeline leakage detection listening device according to claim 2, characterized in that: It also includes a regulating valve (23), wherein the regulating valve (23) is inserted through the bolt, and one end of the regulating valve (23) is connected to one of the sound-receiving spheres. The regulating valve (23) is rotated to control the interface of the upper shell (21) and the interface of the lower shell (22) to move closer to or farther from each other.

4. The pipeline leakage detection listening device according to claim 1, characterized in that: The sound pickup end of the sound pickup rod (1) is provided with a magnetic coating.

5. The pipeline leakage detection listening device according to claim 4, characterized in that: The surface of the sound pickup rod (1) other than the sound pickup end is wrapped with self-luminous fibers.

6. The pipeline leakage detection listening device according to claim 5, characterized in that: The sound pickup end of the sound pickup rod (1) also includes an imaging device, and the imaging device is signal-connected to the analysis terminal (4).

7. The pipeline leakage detection listening device according to claim 1, characterized in that: The earphone (5) comprises a noise reduction layer, the noise reduction layer is arranged outside the auricle, and the noise reduction layer is made of rubber material; the sound receiving sphere is made of aluminum alloy.

8. The pipeline leakage detection listening device according to claim 1, characterized in that: The pickup rod (1) further comprises a shielding cover (11) at a position close to the pickup end, and an organ sealing tube is provided at the contact point between the bottom end of the shielding cover (11) and the pipe.

9. The pipeline leakage detection listening device according to claim 8, wherein an audio amplifier is provided in the analysis terminal (4), and an output end of the audio amplifier is connected to the earphone (5).

10. The pipeline leakage detection listening device according to claim 1, characterized in that: The analysis terminal (4) further comprises a USB interface or a network interface, and the USB interface or the network interface is used to connect to the digital monitoring equipment through the smart pipe network GIS system.

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