Ultrasonic vibration fusion sensor

Abstract

The invention relates to an ultrasonic vibration fusion sensor which is characterized by comprising a signal processing module, and a broadband sensing coil module and an adjustable magnetic field module which are respectively connected with the signal processing module, the broadband sensing coil module is located at one end, attached to a tested device, of the fusion sensor and used for receiving a fusion signal of the tested device from a low-frequency vibration signal to a high-frequency ultrasonic wave signal, and the fusion signal comprises an ultrasonic wave signal and a vibration signal; the adjustable magnetic field module receives fusion signals from the broadband induction coil module and comprises magnets which are fixed on the inner surface of a fusion sensor shell and are opposite in polarity, coils are wound on the magnets, one end of a lead is connected with the signal processing module, the other end of the lead is connected with the fusion sensor shell to be grounded, a closed loop is formed, and electromagnetic induction is achieved. Compared with the prior art, the method has the advantages of simultaneously realizing real-time fusion detection of ultrasonic and vibration signals, being more accurate in detection, improving the acquisition efficiency and the like.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment defect detection, and in particular to an ultrasonic vibration fusion sensor. Background Art

[0002] Gas-Insulated Switchgear (GIS) has been widely used in power systems due to its high reliability, low maintenance cost and long service life. GIS equipment has a complex internal structure, so it is prone to problems such as partial discharge and mechanical vibration during operation. If these problems are not detected and resolved in time, they may lead to equipment failures, and in severe cases, power outages, affecting the safe and stable operation of the power system.

[0003] However, there are currently the following problems in GIS equipment defect detection:

[0004] 1) Traditional ultrasonic and vibration signal detection methods usually rely on a single type of sensor and are unable to simultaneously perform fusion measurements of multiple signals, resulting in incomplete data collection and an inability to accurately reflect the complex state within the GIS.

[0005] 2) Due to the curved surface structure of GIS equipment, it is difficult for conventional flat sensors to achieve good contact with the equipment surface during installation and use, and the measurement efficiency and accuracy are low, and local discharge and vibration signals at the curved surface cannot be effectively detected.

[0006] At present, most ultrasonic or vibration sensors on the market are mainly designed for flat structures and are difficult to adapt to the curved surface structure inside GIS equipment. Traditional sensors are difficult to fix on curved surfaces and cannot guarantee a stable measurement state. At the same time, since the sensor cannot completely fit the curved surface, the signal acquisition efficiency is low and the sensitivity is insufficient.

[0007] In addition, a single ultrasonic or vibration detection method cannot provide sufficient information to comprehensively judge the operating status and potential fault locations of GIS equipment, which seriously affects the effectiveness and timeliness of detection and maintenance work.

[0008] After searching, Chinese invention patent publication number CN116796127A discloses a GIS mechanical property detection method and system based on acoustic-vibration combination, in which the device used to collect the sound signal is a non-contact sound sensor, and the device used to collect the vibration signal is an IEPE acceleration sensor. This existing patent has the problem of requiring two sensors to collect the sound signal and vibration signal of the GIS equipment.

[0009] How to realize ultrasonic vibration fusion sensor for GIS equipment detection has become a technical problem that needs to be solved. Summary of the invention

[0010] The purpose of the present invention is to provide an ultrasonic vibration fusion sensor in order to overcome the defects of the above-mentioned prior art.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] According to one aspect of the present invention, an ultrasonic vibration fusion sensor is provided, the sensor comprising a signal processing module, and a broadband sensing coil module and an adjustable magnetic field module respectively connected to the signal processing module;

[0013] The broadband sensing coil module is located at one end of the fusion sensor attached to the device under test, and includes a low-frequency coil and a high-frequency coil, and is used to receive a fusion signal from the low-frequency vibration signal of the device under test to a high-frequency ultrasonic wave, wherein the fusion signal includes an ultrasonic wave signal and a vibration signal;

[0014] The adjustable magnetic field module receives the fusion signal from the broadband sensor coil module, and includes a magnet with opposite polarities fixed to the inner surface of the fusion sensor housing, a coil wound around the magnet, and generates a magnetic field inside the fusion sensor;

[0015] One end of the lead wire of the adjustable magnetic field module is connected to the signal processing module, and the other end is connected to the housing of the fusion sensor to be grounded, forming a closed loop to achieve electromagnetic induction.

[0016] Preferably, the low-frequency coil is wound on the outside, and the high-frequency coil is wound on the inside.

[0017] Preferably, the diameter of the low-frequency coil is at least 50 mm, and the number of turns is not more than 100; the diameter of the high-frequency coil is not more than 20 mm, and the number of turns is at least 200.

[0018] Preferably, the coil of the broadband sensing coil module is a densely wound coil wound in a circular spiral.

[0019] More preferably, the closely wound coil is connected to the signal processing module by two lead wires to form a closed loop, thereby realizing the electromagnetic induction function of the loop.

[0020] Preferably, the adjustable magnetic field module comprises two semi-cylindrical magnets, the two magnets have opposite polarities and are placed opposite to each other on the same plane, so as to generate an annular magnetic field inside the fusion sensor.

[0021] Preferably, the signal processing module includes a conditioning circuit and a host computer;

[0022] One end of the lead of the adjustable magnetic field module is connected to the conditioning circuit to introduce the electric energy supplied by the host computer; the other end is connected to the shell of the fusion sensor to be grounded, thereby forming a closed loop to realize electromagnetic induction.

[0023] More preferably, the host computer includes an analog-to-digital converter and a digital signal processor to process and analyze the received fusion signal.

[0024] Preferably, the sensor further comprises a flexible connector, wherein the flexible connector is a buffer structure made of a plastic material adaptable to different curved surface shapes;

[0025] The broadband sensing coil module is plugged under the flexible connector.

[0026] More preferably, the sensor further comprises a vibration isolator, which is fixed between the flexible connector and the adjustable magnetic field module and is used for buffering and absorbing vibration.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) The present invention designs a wide-band sensing coil module including a low-frequency coil and a high-frequency coil, and an adjustable magnetic field module, thereby realizing real-time fusion detection of ultrasonic and vibration signals, providing comprehensive equipment operation status data, and collecting fusion signals through a signal processing module to improve the accuracy and timeliness of fault detection.

[0029] 2) The low-frequency coil of the broadband sensing coil module of the present invention is wound on the outside, and the high-frequency coil is wound on the inside. Placing the high-frequency coil on the inside can reduce the coil layout area while increasing the number of winding turns, thereby improving the working efficiency of the coil. The coil adopts a circular spiral winding method to increase the efficiency of the induced electromotive force and enhance the ability to capture ultrasonic waves.

[0030] 3) The adjustable magnetic field module of the present invention includes two semi-cylindrical magnets with opposite polarities and are placed opposite to each other on the same plane. This design greatly enhances the induced electromotive force inside the coil surrounding the magnet, maximizes the electromagnetic induction intensity inside the fusion sensor, and thus increases the sensitivity of signal detection.

[0031] 4) The present invention adapts to the curved surface structure through flexible connectors, so that the fusion sensor can maintain good contact on the complex curved surface of the GIS equipment, improve the signal acquisition efficiency, enhance the breadth and flexibility of application, solve the problem of limited application of traditional sensors on the curved surface structure of GIS equipment, significantly improve the status detection capability of GIS equipment, and provide more effective technical means for the maintenance and fault warning of power equipment.

[0032] 5) The present invention also designs a vibration isolation component, which absorbs the vibration signal to weaken and stabilize the vibration intensity of the coil along the GIS surface, ensuring that the relative movement between the densely wound coil and the magnet is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the sensor in the present invention;

[0034] Figure 2 It is a schematic diagram of the overall layout of the sensor in the present invention;

[0035] Figure 3 A schematic top view of a densely wound coil in an embodiment of the present invention;

[0036] In the attached drawings, 1 is a broadband sensing coil module, 2 is an adjustable magnetic field module, 3 is a signal processing module, 4 is a flexible connector, 5 is a vibration isolation component, 31 is a conditioning circuit, and 32 is a host computer. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work should fall within the scope of protection of the present invention.

[0038] The fusion sensor of the present invention integrates a broadband sensing coil module and an adjustable magnetic field module. Through innovative structural design, it can simultaneously realize effective detection and processing of different frequency signals such as ultrasound (high frequency) and vibration (low frequency), thereby improving the accuracy and timeliness of fault detection. The sensor has a multi-mode signal processing function, and can fuse and analyze vibration and ultrasonic signals to more accurately determine the operating status of GIS equipment. In view of the curved surface characteristics of GIS equipment, the sensing coil uses flexible materials to ensure reliable contact and accuracy of signal measurement on the complex curved surface of GIS, thereby improving the efficiency of signal measurement. Because the fusion sensor uses flexible materials, it has multiple adjustable adaptability, and each part can be independently adjusted to adapt to the curvature of different GIS surfaces, thereby better adapting to the diversified structures of GIS equipment and improving the detection sensitivity and adaptability to partial discharge and mechanical vibration.

[0039] Example 1

[0040] This embodiment relates to an ultrasonic vibration fusion sensor, which is used for detecting the surface of gas insulated switchgear (GIS), and can simultaneously capture low-frequency vibration signals and high-frequency ultrasonic signals. The fusion sensor has the appearance of a cylindrical probe, and the overall design is compact and has multiple functions. Its internal structure is as follows: Figure 1 , including a broadband sensing coil module 1, an adjustable magnetic field module 2 and a signal processing module 3.

[0041] In order to ensure that the sensor can maintain stable contact on the complex and tortuous GIS surface, the sensor is also integrated with a flexible connector 4 and a vibration isolator 5. The design and combination of these components enable the sensor's detection surface to fit closely to the surface of the GIS equipment and ensure the stability of the relative movement between the coil and the magnet, thereby improving the detection accuracy.

[0042] 1) The broadband sensing coil module 1 is one of the cores of the fusion sensor and is used to receive sound wave signals from low-frequency vibration signals to high-frequency ultrasonic waves. Figure 3 As shown, the broadband sensing coil module 1 is composed of a densely wound coil, which is wound in a circular spiral manner to increase the efficiency of the induced electromotive force.

[0043] The densely wound coil is connected to the conditioning circuit inside the fusion sensor through two leads to form a closed loop to realize the electromagnetic induction function. The densely wound coil is plugged under the flexible connector 4 at the bottom of the sensor to ensure that the relative movement between the densely wound coil and the magnet is more stable and reliable.

[0044] 2) Adjustable magnetic field module 2 is another important functional component in the fusion sensor, which includes two semi-cylindrical magnets, which are fixed to the inner surface of the fusion sensor housing by a fastening device, and a coil is wound around the magnet. The two magnets have opposite polarities and are placed opposite to each other on the same plane, so a circular magnetic field is generated inside the sensor. This design greatly enhances the induced electromotive force inside the coil wrapped around the magnet, maximizes the electromagnetic induction intensity inside the fusion sensor, and thus increases the sensitivity of signal detection.

[0045] 3) The signal processing module 3 is connected to the broadband sensing coil module 1 and the adjustable magnetic field module 2 respectively. The signal processing module 3 includes a connected conditioning circuit 31 and a host computer 32. The conditioning circuit 31 is connected to the lead of the broadband sensing coil module 1 to form a closed loop, thereby realizing electromagnetic induction. The electromagnetic induction signal is transmitted to the host computer 32 after passing through the conditioning circuit 31. The host computer 32 receives and analyzes the ultrasound-vibration fusion signal, and also supplies power to the adjustable magnetic field module 2. One end of the adjustable magnetic field module 2 is connected to the conditioning circuit 31 to introduce the electric energy supplied by the host computer 32; the other end is connected to the housing of the fusion sensor to be grounded, thereby forming a closed loop.

[0046] 4) The flexible connector 4 is a cylindrical structure located at the bottom of the fusion sensor. It is made of a plastic material with high plasticity, and is made of a plastic material with an elongation δ greater than 300%, and can bend and adapt to the shapes of different curved surfaces. In actual use, the detection personnel only need to align the fusion sensor with the detection point on the surface of the GIS equipment and apply a certain pressure, and the flexible connector 4 will produce a moderate deformation to ensure that the sensor fits tightly with the curved GIS surface, thereby improving the accuracy of signal acquisition.

[0047] 5) The vibration isolation member 5 is fixed between the flexible connector 4 and the adjustable magnetic field module 2, and plays a role in buffering and vibration absorption. Through the vibration isolation member 5, the fusion sensor can effectively reduce the impact of vibration from the GIS surface, ensure the stability of the broadband sensing coil module 1, and ensure that the relative movement between the coil and the magnet is not disturbed by the outside world, thereby improving the reliability and accuracy of the overall detection.

[0048] Through a series of precise designs and structural optimizations, the ultrasonic vibration fusion sensor can simultaneously detect low-frequency vibration signals and high-frequency ultrasonic signals, realize accurate identification and detection of various types of defects in GIS, and thus conduct a more comprehensive assessment of the operating status of GIS equipment. It can not only adapt to complex surface shapes, but also effectively capture and process signals of various frequencies. It is an ideal choice to ensure the safe operation of GIS equipment.

[0049] Example 2

[0050] This embodiment also relates to an ultrasonic vibration fusion sensor, such as Figure 2 The fusion sensor is a cylindrical probe with a compact design and multiple functions, including:

[0051] Broadband sensor coil module 1: Figure 3 , the broadband sensing coil module 1 includes a low-frequency coil and a high-frequency coil. The low-frequency coil is specifically used to receive low-frequency vibration signals in the range of 20Hz to 2kHz. The low-frequency coil has a coil diameter of at least 50mm, is wound with a copper wire of at least 1mm thick, and has a winding number of no more than 100 turns, so as to reduce the overall resistance and self-inductance of the coil, and improve the sensitivity and response speed to the low-frequency vibration signal; the high-frequency coil is specifically used to receive ultrasonic waves above 20kHz. The high-frequency coil has a coil diameter of no more than 20mm, is wound with a silver alloy wire of 0.5mm thick, and has a winding number of at least 200 turns, so as to enhance the magnetic field strength of the coil, thereby improving the ability to capture high-frequency ultrasonic waves. The low-frequency coil is wound on the outside and the high-frequency coil is wound on the inside, so that the sensor can simultaneously receive low-frequency vibration signals and high-frequency ultrasonic signals. The high-frequency coil has a large number of turns and a small wire diameter. Placing it on the inside can reduce the coil layout area while increasing the number of winding turns, thereby improving the coil working efficiency and enhancing the ability to capture ultrasonic waves.

[0052] Adjustable magnetic field module 2: The adjustable magnetic field module 2 includes two semi-cylindrical magnets placed opposite to each other, which are fixed to the inner surface of the sensor housing through a fastening structure. The two magnets have opposite polarities and are placed opposite to each other on the same plane, thereby generating a similar annular magnetic field inside the sensor. This design greatly enhances the induced electromotive force inside the coil, maximizes the electromagnetic induction intensity inside the sensor, and thus increases the sensitivity of signal detection.

[0053] Signal processing module 3: the host computer 32 includes:

[0054] 1) Analog-to-digital converter (ADC), used to convert received analog signals from low-frequency vibration signals (20 Hz to 2 kHz) to high-frequency ultrasonic signals (above 2 kHz) into digital signals;

[0055] 2) Digital signal processor (DSP), with advanced signal processing capabilities, performs signal filtering, amplification and frequency analysis. The DSP is designed to process low-frequency vibration and high-frequency ultrasonic signals separately according to the different frequency characteristics of the signals, to optimize their respective signal processing paths and analysis methods, and ensure accurate data analysis and result output.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An ultrasonic vibration fusion sensor, characterized in that: The sensor comprises a signal processing module (3), and a broadband sensing coil module (1) and an adjustable magnetic field module (2) respectively connected to the signal processing module (3); The broadband sensing coil module (1) is located at one end of the fusion sensor that is attached to the device under test, and comprises a low-frequency coil and a high-frequency coil, and is used to receive a fusion signal from the low-frequency vibration signal of the device under test to a high-frequency ultrasonic wave, wherein the fusion signal comprises an ultrasonic wave signal and a vibration signal; The adjustable magnetic field module (2) receives the fusion signal from the broadband sensor coil module (1), and comprises a magnet with opposite polarities fixed to the inner surface of the fusion sensor housing, a coil wound around the magnet, and generates a magnetic field inside the fusion sensor; One end of the lead of the adjustable magnetic field module (2) is connected to the signal processing module (3), and the other end is connected to the housing of the fusion sensor to be grounded, thereby forming a closed loop and realizing electromagnetic induction.

2. The ultrasonic vibration fusion sensor according to claim 1, characterized in that: The low-frequency coil is wound on the outside, and the high-frequency coil is wound on the inside.

3. The ultrasonic vibration fusion sensor according to claim 1, characterized in that: The diameter of the low-frequency coil is at least 50 mm, and the number of windings is not more than 100; the diameter of the high-frequency coil is not more than 20 mm, and the number of windings is at least 200.

4. The ultrasonic vibration fusion sensor according to claim 1, characterized in that: The coil of the broadband sensing coil module (1) is a densely wound coil wound in a circular spiral.

5. The ultrasonic vibration fusion sensor according to claim 4, characterized in that: The closely wound coil is connected to the signal processing module (3) by two lead wires to form a closed loop, thereby realizing the electromagnetic induction function of the loop.

6. The ultrasonic vibration fusion sensor according to claim 1, characterized in that: The adjustable magnetic field module (2) comprises two semi-cylindrical magnets, the two magnets have opposite polarities and are placed opposite to each other on the same plane, thereby generating a ring-shaped magnetic field inside the fusion sensor.

7. The ultrasonic vibration fusion sensor according to claim 1, characterized in that: The signal processing module (3) comprises a conditioning circuit (31) and a host computer (32); One end of the lead of the adjustable magnetic field module (2) is connected to the conditioning circuit (31) to introduce electric energy supplied by the host computer (32); the other end is connected to the housing of the fusion sensor to be grounded, thereby forming a closed loop to achieve electromagnetic induction.

8. The ultrasonic vibration fusion sensor according to claim 7, characterized in that: The host computer (32) comprises an analog-to-digital converter and a digital signal processor, and processes and analyzes the received fusion signal.

9. The ultrasonic vibration fusion sensor according to claim 1, characterized in that: The sensor further comprises a flexible connector (4), wherein the flexible connector (4) is a buffer structure made of a plastic material that can adapt to different curved surface shapes; The broadband sensing coil module (1) is plugged under the flexible connector (4).

10. The ultrasonic vibration fusion sensor according to claim 9, characterized in that: The sensor further comprises a vibration isolator (5), which is fixed between the flexible connector (4) and the adjustable magnetic field module (2) and is used for buffering and absorbing vibration.

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