Shock tube test system for pressure sensor multi-angle measurement method verification

Abstract

The utility model provides a kind of for the shock tube test system of multi-angle measurement method verification of pressure sensor, the structure of normal pressure chamber is improved, high pressure chamber is separated by diaphragm in one end of normal pressure chamber, and multiple ports are opened in the other end of normal pressure chamber and the lateral wall of normal pressure chamber. For the test reliability of verifying pressure sensor in different positions, only need to set up measuring end cap on one port, set up pressure sensor on the measuring end cap, for other ports, by setting up sealing end cap, to realize the purpose of plugging. Specifically, sensor mounting hole for installing pressure sensor is set up on the measuring end cap. The present application improves the shock tube experimental platform for the actual pressure measurement position inside arc-extinguishing chamber, designs shock tube transverse and longitudinal test position, to verify the test reliability of sensor in different positions, improve the effectiveness of pressure measurement.

Description

Technical Field

[0001] This utility model belongs to the field of high voltage electrical equipment design and testing, and specifically relates to a shock tube testing system for verifying multi-angle measurement methods of pressure sensors. Background Technology

[0002] The structural design of the arc-extinguishing chamber of an SF6 circuit breaker is one of the key factors determining its breaking performance, directly influencing the efficiency of arc energy dissipation during current interruption. Therefore, to improve arc energy dissipation efficiency and enhance the breaking performance of circuit breakers, extensive theoretical and simulation studies have been conducted focusing on arc phenomena and mechanisms. During the breaking process of an SF6 gas circuit breaker, the pressure change inside the arc-extinguishing chamber directly determines whether it can successfully interrupt the circuit.

[0003] Currently, research on pressure measurement methods inside the arc-extinguishing chamber of gas circuit breakers primarily utilizes pressure sensors. The selection of the pressure sensor and the measurement method are crucial to the reliability of the arc-extinguishing chamber pressure measurement. A shock tube device, commonly used for pressure sensor calibration, is employed; its structural schematic diagram is shown below. Figure 1 A thin film divides a long tube into two sections: a high-pressure chamber S1 and a low-pressure chamber S2. Pressure sensors are primarily installed at the nozzle and compressor cylinder, but their measurement positions are not aligned with the airflow direction within the arc-extinguishing chamber. A perforation is made in the nozzle or compressor cylinder wall to implant a piezoresistive or piezoelectric miniature pressure sensor to acquire transient pressure waveforms. The inventors discovered that pressure sensor calibration using existing shock tube experimental platforms mainly involves testing in the same direction. The pressure measurement results do not directly reflect changes in pressure within the arc-extinguishing chamber, potentially leading to biases in subsequent analysis and design.

[0004] Therefore, it is necessary to improve the design of the shock tube experimental platform to intuitively reflect the pressure measurement results, develop appropriate measurement and correction methods, and improve the effectiveness of pressure measurement. Utility Model Content

[0005] The purpose of this invention is to provide a shock tube testing system for verifying multi-angle measurement methods of pressure sensors, which can verify the testing reliability of sensors at different positions and improve the effectiveness of pressure measurement.

[0006] To solve the above-mentioned technical problems, this utility model provides a shock tube testing system for verifying multi-angle measurement methods of pressure sensors, including a high-pressure gas chamber and an atmospheric pressure gas chamber. Both the high-pressure gas chamber and the atmospheric pressure gas chamber are tubular structures. One end of the atmospheric pressure gas chamber is connected to one end of the high-pressure gas chamber. The atmospheric pressure gas chamber and the high-pressure gas chamber are separated by a thin film. The other end of the high-pressure gas chamber is used to introduce gas.

[0007] Multiple ports are provided at the other end of the atmospheric pressure chamber and on the side wall of the atmospheric pressure chamber. The port to be tested is used to connect to the measuring end cover, and the other ports are used to connect to the sealing end cover. The measuring end cover is provided with a sensor mounting hole for installing a pressure sensor, and the sealing end cover is used to block the ports.

[0008] Optionally, the shock tube test system for verifying the multi-angle measurement method of the pressure sensor described above also includes a signal conditioning unit, a data acquisition unit, and an analysis unit. The pressure sensor is electrically or signal-connected to the analysis unit through the signal conditioning unit, the data acquisition unit, and the analysis unit in sequence.

[0009] The signal conditioning unit is a pressure amplification and conversion circuit. The data acquisition unit is used to acquire the signal from the signal conditioning unit and feed it back to the analysis unit. The analysis unit is used to perform real-time analysis and processing on the acquired signal waveform.

[0010] Optionally, in the shock tube test system for verifying the multi-angle measurement method of pressure sensors described above, there are multiple pressure sensors, one pressure sensor corresponds to one data acquisition unit, and all data acquisition units are electrically or signal-connected to one analysis unit through one data acquisition unit.

[0011] Optionally, the shock tube test system for verifying the multi-angle measurement method of pressure sensor described above also includes an oscilloscope, which contains the signal conditioning unit, the data acquisition unit, and the analysis unit.

[0012] Optionally, in the shock tube test system described above for verifying the multi-angle measurement method of pressure sensors, the ports are provided on both the upper and lower sides of the sidewall of the atmospheric pressure chamber.

[0013] Optionally, in the shock tube test system described above for verifying the multi-angle measurement method of pressure sensors, the ports on the upper side of the sidewall of the atmospheric pressure chamber are staggered with the ports on the lower sidewall.

[0014] Optionally, the shock tube test system for verifying the multi-angle measurement method of pressure sensor described above also includes a gas storage cylinder, which is connected to the high-pressure gas chamber via a gas guide pipe.

[0015] Optionally, in the shock tube test system described above for verifying the multi-angle measurement method of pressure sensors, the gas in the gas storage bottle is nitrogen or compressed air.

[0016] Optionally, in the shock tube test system described above for verifying the multi-angle measurement method of pressure sensor, a pressure reducing valve is connected in series on the air guide tube.

[0017] And / or, the air guide tube is connected to the end cap of the high-pressure air chamber via an air nozzle.

[0018] Optionally, the shock tube test system for verifying the multi-angle measurement method of the pressure sensor described above also includes a support platform, which is used to support the high-pressure gas chamber and the normal-pressure gas chamber.

[0019] This invention provides a shock tube testing system for verifying multi-angle measurement methods of pressure sensors, and its advantages are as follows:

[0020] By improving the structure of the atmospheric pressure chamber, a high-pressure chamber is separated from the atmospheric pressure chamber at one end by a thin film, and multiple ports are provided at the other end of the atmospheric pressure chamber and on its side wall. When verifying the reliability of the pressure sensor at different locations, only one port needs a measuring end cap, on which the pressure sensor is mounted. For the other ports, sealing end caps are used to achieve the purpose of sealing. Specifically, the measuring end cap has sensor mounting holes for installing the pressure sensor.

[0021] This solution addresses the actual pressure measurement location inside the arc-extinguishing chamber by improving the shock tube experimental platform and designing transverse and longitudinal test positions for the shock tube. This is done to verify the reliability of the sensor at different locations and improve the effectiveness of pressure measurement. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a high-pressure gas chamber and a low-pressure gas chamber in the prior art;

[0024] Figures 2-3 This is a schematic diagram of a shock tube testing system for verifying a multi-angle measurement method of a pressure sensor, provided as an embodiment of the present invention; (the atmospheric pressure chamber in the figure is only a schematic diagram and the ports on the side wall of the atmospheric pressure chamber are not shown).

[0025] Figure 4 A schematic diagram of the atmospheric pressure chamber provided in an embodiment of this utility model; (the measuring end cap and sealing end cap are not shown in the figure).

[0026] Figures 5-6 A schematic diagram of a pressure signal conditioning and acquisition system provided in an embodiment of this utility model.

[0027] exist Figure 1 middle:

[0028] S1 - High-pressure chamber; S2 - Low-pressure chamber;

[0029] exist Figures 2-6 middle:

[0030] 100 - Gas cylinder; 110 - Pressure reducing valve; 120 - Gas delivery tube; 130 - Gas nozzle;

[0031] 200 - High-pressure gas chamber; 210 - Membrane;

[0032] 300 - Atmospheric pressure chamber; 310 - Chamber body; 320 - Port;

[0033] 400 - Pressure sensor;

[0034] 500-Oscilloscope;

[0035] 600 - Support platform;

[0036] 700 - Signal Conditioning Unit;

[0037] 800 - Data Acquisition Unit;

[0038] 900 - Analysis Unit. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] The core of this invention is to provide a shock tube testing system for verifying multi-angle measurement methods of pressure sensors. This system can verify the reliability of the sensor at different locations and improve the effectiveness of pressure measurement.

[0041] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] For details, please refer to Figures 2-6 The present invention provides a shock tube testing system for verifying the multi-angle measurement method of pressure sensor, including a high-pressure gas chamber 200 and an atmospheric pressure gas chamber 300.

[0043] Both the high-pressure chamber 200 and the normal-pressure chamber 300 are tubular structures. One end of the normal-pressure chamber 300 is connected to one end of the high-pressure chamber 200. The normal-pressure chamber 300 and the high-pressure chamber 200 are separated by a membrane 210. The other end of the high-pressure chamber 200 is used to introduce gas.

[0044] Multiple ports 320 are provided at the other end of the atmospheric pressure chamber 300 and on the side wall of the atmospheric pressure chamber 300. Each port 320 is equipped with a measuring end cover for the port to be tested and a sealing end cover for the other ports. The measuring end cover is provided with a sensor mounting hole for installing the pressure sensor 400, and the sealing end cover is used to block the port.

[0045] It should be noted that the pressure sensor 400 is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to a certain rule. The pressure sensor 400 typically consists of a pressure-sensitive element and a signal processing unit. Depending on the type of pressure being tested, the pressure sensor 400 in this case can be classified as a gauge pressure sensor, a differential pressure sensor, and an absolute pressure sensor. These types are common in the prior art and will not be further limited here.

[0046] This solution provides a shock tube testing system for verifying multi-angle measurement methods of pressure sensors. By improving the structure of the atmospheric pressure chamber 300, a high-pressure chamber 200 is separated from the atmospheric pressure chamber 300 by a membrane 210 at one end. Multiple ports 320 are provided at the other end of the atmospheric pressure chamber 300 and on its side wall. When verifying the reliability of the pressure sensor 400 at different locations, only one port needs a measuring end cap, on which the pressure sensor 400 is mounted. For the other ports, sealing end caps are used to achieve the purpose of sealing. Specifically, the measuring end cap has sensor mounting holes for mounting the pressure sensor 400.

[0047] This solution addresses the actual pressure measurement location inside the arc-extinguishing chamber by improving the shock tube experimental platform and designing transverse and longitudinal test positions for the shock tube. This is done to verify the reliability of the sensor at different locations and improve the effectiveness of pressure measurement.

[0048] This solution also includes a signal conditioning unit 700, a data acquisition unit 800, and an analysis unit 900. The pressure sensor 400 is electrically or signal-connected to the analysis unit 900 through the signal conditioning unit 700, the data acquisition unit 800, and the analysis unit 900 in sequence.

[0049] The signal conditioning unit 700 is a pressure amplification and conversion circuit. This circuit serves as an interface for the sensor, amplifying the weak signal output by the sensor to a level suitable for measurement and control. Sensors typically output relatively small voltages or currents; the pressure amplification and conversion circuit can amplify these signals to a range suitable for measurement and control, enabling precise measurement and control and facilitating processing by subsequent circuits. Using a suitable pressure amplification and conversion circuit can meet the testing and calibration requirements of various pressure sensors.

[0050] The data acquisition unit 800 acquires signals from the signal conditioning unit 700 and feeds them back to the analysis unit 900. The analysis unit 900 performs real-time analysis and processing of the acquired signal waveforms. This design can be applied not only to pressure measurement inside the arc-extinguishing chamber of gas circuit breakers, but also to pressure measurement needs during short-circuit tests and internal arc tests of equipment such as switchgear, instrument transformers, and surge arresters.

[0051] It should be explained that the pressure change inside the arc-extinguishing chamber during the short-circuit breaking process of a gas circuit breaker directly affects its success. Pressure sensors are used to measure the pressure inside the arc-extinguishing chamber. Considering the high temperature, high pressure, and strong magnetic field environment inside the arc-extinguishing chamber during short-circuit breaking, it is necessary to select appropriate pressure sensors and measurement methods. The pressure sensor is tested and calibrated using a shock tube high- and low-pressure chamber to simulate pressure changes. This scheme improves the structure of the atmospheric pressure chamber 300 based on the actual pressure measurement location inside the arc-extinguishing chamber, designing test positions in both the transverse and longitudinal directions to achieve transverse and longitudinal pressure testing and comparative analysis.

[0052] A shock tube testing system is used to simulate dynamic pressure changes to verify the performance of the pressure sensor and the measurement method. To verify whether the pressure sensor's specifications meet the requirements of actual pressure measurement, equivalent measurement methods used in tests on equipment such as arc-extinguishing chambers, switchgear, and instrument transformers are selected to avoid damage to the pressure sensor from direct measurement.

[0053] The membrane 210 is a PVC membrane. During the experiment, gas is introduced into the two chambers as background pressure, at which point the gas pressure in both chambers is the same. The gas in the high-pressure chamber 200 is the high-pressure driving gas, and the gas in the normal-pressure chamber 300 is the low-pressure driven experimental gas. The membrane 210 separates the high-pressure chamber 200 and the normal-pressure chamber 300 into two sections.

[0054] The valve is then closed, and gas is introduced only into the high-pressure chamber 200. When the pressure difference between the two chambers ruptures the membrane 210, the high pressure drives the gas to expand, generating a shock wave that propagates rapidly through the low-pressure experimental gas to the right and an expansion wave that propagates to the left. The compression effect of the shock wave causes corresponding changes in the parameters of the experimental gas, such as a significant increase in pressure p and temperature T, thus obtaining operating conditions that meet the simulation requirements. The shock wave produces a pressure step change with an extremely steep rise time, typically on the order of microseconds. This step wave can simulate the transient pressure signal inside the arc-extinguishing chamber during circuit breaker interruption.

[0055] The gas flow obtained using a shock tube can be used for aerodynamic experimental research for various purposes.

[0056] Meanwhile, considering the calibration requirements of different types of pressure sensors, the shock tube test system needs to be improved and designed accordingly. A corresponding signal conditioning unit 700 and a data acquisition unit 800 are designed based on this, and data acquisition and analysis can be easily realized on the analysis unit 900 (e.g., a computer).

[0057] In a further specific embodiment, the number of pressure sensors 400 can be one, such as... Figure 2 and Figure 5 As shown, a lead wire of a pressure sensor 400 is connected to a data acquisition unit 800, and the data acquisition unit 800 is electrically or signal-connected to an analysis unit 900.

[0058] like Figure 3 and Figure 6 As shown, there can be multiple pressure sensors 400, i.e., multiple sensor mounting holes are provided on the measuring end cap. One pressure sensor 400 is connected to a data acquisition unit 800 via its lead wire. All data acquisition units 800 are connected to the same data acquisition unit 800 via a lead wire, and this data acquisition unit 800 is connected to an analysis unit 900 via its lead wire. Using multiple pressure sensors 400 allows for more accurate detection results.

[0059] In order to display the analysis results of the analysis unit 900 intuitively, this solution also includes an oscilloscope 500. The oscilloscope 500 is equipped with a signal conditioning unit 700, a data acquisition unit 800 and an analysis unit 900, so as to display the corresponding pressure measurement waveform on the oscilloscope 500 and perform real-time analysis and processing on the acquired waveform.

[0060] Furthermore, by improving the design of the sensor mounting holes on the measuring end cap, matching sensor mounting holes can be designed for pressure sensors of different sizes, thus meeting the installation and testing needs of different types and specifications of pressure sensors.

[0061] In a specific embodiment, the atmospheric pressure chamber 300 includes a tubular chamber body 310, which is horizontally positioned. Ports 320 are provided on both its upper and lower side walls, providing transverse and longitudinal test positions for the shock tube to verify the reliability of the pressure sensor at different locations. Furthermore, to ensure a more uniform distribution of pressure test positions across the atmospheric pressure chamber 300, the ports 320 on the upper and lower side walls (especially in the vertical projection direction) are staggered. This arrangement creates more uniform pressure test points, improves the verification effect of the pressure sensor during multi-angle measurements, and thus enhances the accuracy of the testing system.

[0062] This scheme also includes a gas storage cylinder 100, which is connected to the high-pressure gas chamber 200 via a gas delivery pipe 120. As mentioned above, the gas inside the high-pressure gas chamber 200 is a high-pressure driving gas, and the gas storage cylinder 100 serves as a device for supplying this high-pressure driving gas. The high-pressure driving gas can be nitrogen or compressed air. The operation procedure for the high-pressure gas chamber involves introducing high-pressure driving gas into the high-pressure gas chamber 200, gradually adjusting the gas pressure, and observing the rupture point of the membrane 210 and the generation of the shock wave.

[0063] To better regulate the gas flow and pressure in the gas cylinder 100, a pressure reducing valve 110 is connected in series on the gas delivery pipe 120. A nozzle 130 can also be connected between the gas delivery pipe 120 and the end cap of the high-pressure chamber 200, allowing for more uniform gas flow into the high-pressure chamber 200. A support platform 600 is used to stably support the high-pressure chamber 200 and the atmospheric pressure chamber 300. The system uses the propagation of shock waves between the high-pressure chamber 200 and the atmospheric pressure chamber 300 to perform multi-angle measurement calibration on the pressure sensor installed in the atmospheric pressure chamber 300.

[0064] The shock tube testing system provided in this solution for verifying multi-angle measurement methods of pressure sensors can be directly applied to the internal pressure measurement of the arc-extinguishing chamber of gas circuit breakers, exhibiting high equivalence and providing effective data support for the structural design and improvement of gas circuit breakers. Simultaneously, this technical solution is also applicable to the pressure measurement verification needs during short-circuit tests and internal arc tests of equipment such as switchgear, instrument transformers, and surge arresters, expanding the application scenarios and scope of this method. It is of great significance to the design of subsequent products in related systems and to the safe and reliable operation of power systems. It also aligns with the development needs of my country's industrial policies and plays a major strategic role in the future construction of ultra-high voltage and extra-high voltage transmission lines in my country.

[0065] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0066] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0067] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0068] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0069] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A shock tube testing system for calibrating multi-angle measurement methods of pressure sensors, characterized in that, It includes a high-pressure gas chamber (200) and an atmospheric pressure gas chamber (300), both of which are tubular structures. One end of the atmospheric pressure gas chamber (300) is connected to one end of the high-pressure gas chamber (200), and the atmospheric pressure gas chamber (300) and the high-pressure gas chamber (200) are separated by a membrane (210). The other end of the high-pressure gas chamber (200) is used to introduce gas. Multiple ports (320) are provided at the other end of the atmospheric pressure chamber (300) and on the side wall of the atmospheric pressure chamber (300). The port to be tested in each port (320) is used to connect to the measuring end cover, and the remaining ports are used to connect to the sealing end cover. The measuring end cover is provided with a sensor mounting hole for installing a pressure sensor (400), and the sealing end cover is used to block the port.

2. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 1, characterized in that, It also includes a signal conditioning unit (700), a data acquisition unit (800) and an analysis unit (900), wherein the pressure sensor (400) is electrically or signal-connected to the analysis unit (900) in sequence through the signal conditioning unit (700), the data acquisition unit (800); The signal conditioning unit (700) is a pressure amplification and conversion circuit. The data acquisition unit (800) is used to acquire the signal from the signal conditioning unit (700) and feed it back to the analysis unit (900). The analysis unit (900) is used to perform real-time analysis and processing on the acquired signal waveform.

3. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 2, characterized in that, There are multiple pressure sensors (400), one pressure sensor (400) corresponds to one data acquisition unit (800), and all data acquisition units (800) are electrically or signal-connected to one analysis unit (900) through one data acquisition unit (800).

4. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 2, characterized in that, It also includes an oscilloscope (500), in which the signal conditioning unit (700), the data acquisition unit (800) and the analysis unit (900) are disposed.

5. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 1, characterized in that, The port (320) is provided on both the upper and lower sides of the side wall of the atmospheric pressure chamber (300).

6. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 5, characterized in that, The ports (320) on the upper side of the sidewall of the atmospheric pressure chamber (300) and the ports (320) on the lower sidewall are staggered.

7. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 1, characterized in that, It also includes a gas storage cylinder (100), which is connected to the high-pressure gas chamber (200) via a gas guide pipe (120).

8. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 7, characterized in that, The gas in the gas storage cylinder (100) is nitrogen or compressed air.

9. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 7, characterized in that, A pressure reducing valve (110) is connected in series on the air duct (120). And / or, the air duct (120) is connected to the end cap of the high-pressure air chamber (200) via an air nozzle (130).

10. The shock tube testing system for verifying multi-angle measurement methods of pressure sensors according to claim 1, characterized in that, It also includes a support platform (600) for supporting the high-pressure chamber (200) and the normal-pressure chamber (300).

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