Acceleration sensor

Abstract

The invention provides an acceleration sensor. The acceleration sensor comprises a high-temperature piezoelectric sensitive element and a three-coaxial mineral insulated cable, the high-temperature piezoelectric sensitive element is used for converting a vibration signal into a charge signal and ensuring that the acceleration sensor stably works in a high-temperature environment; and the three coaxial mineral insulated cables are used for outputting charge signals and shielding electromagnetic interference. According to the integrated high-temperature acceleration sensor based on the three coaxial mineral insulated cables, the high-temperature piezoelectric sensitive element in the acceleration sensor is combined, so that the acceleration sensor has the advantages of high temperature resistance, electromagnetic interference resistance, high reliability and high measurement precision; the problems that an existing acceleration sensor is poor in working stability, low in measurement precision and the like in the high-temperature and strong-electromagnetic-interference environment are solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sensors, and in particular to an acceleration sensor. Background Art

[0002] In the fields of nuclear industry, aerospace, petrochemical industry, etc., it is often necessary to monitor the vibration of equipment in high temperature, high radiation, and strong electromagnetic interference environments. Traditional accelerometers are difficult to work stably in high temperature environments due to material and structural limitations, and are easily affected by electromagnetic interference, resulting in poor working stability, reduced measurement accuracy, and even failure. Summary of the invention

[0003] The technical problem to be solved by the present disclosure is to provide an acceleration sensor to overcome the defects of the acceleration sensor in the prior art, such as poor working stability and low measurement accuracy under high temperature and strong electromagnetic interference environment.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A first aspect of the present disclosure provides an acceleration sensor, comprising a high-temperature piezoelectric sensitive element and a triaxial mineral insulated cable;

[0006] The high-temperature piezoelectric sensitive element is used to convert the vibration signal into a charge signal and ensure that the acceleration sensor works stably in a high-temperature environment;

[0007] The triaxial mineral insulated cable is used to output the charge signal and shield electromagnetic interference.

[0008] Preferably, it also includes a three-coaxial sealed connector;

[0009] The triaxial sealed connector is used to connect the triaxial mineral insulated cable with the flexible cable.

[0010] Preferably, the material of the high-temperature piezoelectric sensitive element includes high-temperature piezoelectric ceramic material.

[0011] Preferably, the core wire of the triaxial mineral insulated cable is welded to the positive electrode of the acceleration sensor, the inner shield layer of the triaxial mineral insulated cable is welded to the negative electrode of the acceleration sensor, and the outer shield layer of the triaxial mineral insulated cable is welded to the shell of the acceleration sensor.

[0012] Preferably, it also includes a housing;

[0013] The housing is used to encapsulate the high-temperature piezoelectric sensitive element, shield electromagnetic interference and protect the machine.

[0014] Preferably, it also includes a housing;

[0015] The material of the shell includes high temperature resistant alloy material.

[0016] Preferably, it also includes a housing;

[0017] The shell and the triaxial mineral insulated cable are sealed by a high-temperature sealing material.

[0018] Preferably, the operating temperature range of the acceleration sensor is -50°C to 500°C.

[0019] Preferably, the frequency response range of the acceleration sensor is 0.2 Hz to 10 kHz.

[0020] Preferably, the sensitivity range of the acceleration sensor is 50mV / g~100mV / g;

[0021] and / or,

[0022] The anti-electromagnetic interference performance index range of the acceleration sensor is 100V / m~200V / m.

[0023] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0024] The positive and progressive effects of this disclosure are:

[0025] The present invention discloses an integrated high-temperature acceleration sensor based on a triaxial mineral insulated cable, which is combined with a high-temperature piezoelectric sensitive element in the acceleration sensor, so that the acceleration sensor has the advantages of high temperature resistance, anti-electromagnetic interference, high reliability and high measurement accuracy, and solves the problems of poor working stability and low measurement accuracy of existing acceleration sensors in high temperature and strong electromagnetic interference environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the acceleration sensor provided in Example 1 of the present disclosure. DETAILED DESCRIPTION

[0027] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0028] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0029] In the embodiments of the present disclosure, the collection, storage, use, processing, transmission, provision and disclosure of user personal information involved are in compliance with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0030] Example 1

[0031] Figure 1 A schematic diagram of the structure of an acceleration sensor provided in Embodiment 1 of the present disclosure is shown in FIG. Figure 1 As shown, the acceleration sensor includes a high-temperature piezoelectric sensitive element and a triaxial mineral insulated cable;

[0032] High-temperature piezoelectric sensitive elements are used to convert vibration signals into charge signals and ensure that the acceleration sensor works stably in high-temperature environments;

[0033] In this embodiment, the acceleration sensor includes a high-temperature piezoelectric sensitive element, so that the acceleration sensor has the advantage of high temperature resistance.

[0034] Triaxial mineral insulated cable, used to output charge signals and shield electromagnetic interference.

[0035] In this embodiment, the triaxial mineral insulated cable is used to transmit the charge signal from the acceleration sensor to the preamplifier and plays a role in shielding electromagnetic interference. The triaxial mineral insulated cable uses inorganic insulating materials such as magnesium oxide or aluminum oxide as an insulator.

[0036] This embodiment integrates the high-temperature piezoelectric sensitive element and the triaxial mineral insulated cable together, reducing the risk of air leakage at the connection causing the mineral insulated cable to become damp and the insulation to deteriorate, thereby improving the quality and service life of the acceleration sensor.

[0037] In an optional embodiment, it also includes a three-coaxial sealed connector;

[0038] Triaxial sealed connector, used to connect triaxial mineral insulated cable with flexible cable.

[0039] In this embodiment, the three-coaxial TRT sealed connector uses high temperature resistant and radiation resistant materials. The connector uses a sealing structure to prevent moisture from entering and reducing the insulation of the mineral insulated cable. It is also used to connect the three-coaxial mineral insulated cable with the flexible cable, providing mechanical protection and electromagnetic interference shielding.

[0040] The acceleration sensor and the three-coaxial sealed connector of this embodiment are both made of high-temperature resistant and radiation resistant materials and have an integrated design, which improves the reliability and service life of the acceleration sensor and reduces maintenance costs.

[0041] In an optional embodiment, the material of the high-temperature piezoelectric sensitive element includes a high-temperature piezoelectric ceramic material.

[0042] In this embodiment, the high temperature piezoelectric sensitive element is made of high temperature piezoelectric ceramic material, such as lead zirconate titanate (PZT) or lithium niobate (LiNbO3).

[0043] In an optional embodiment, the core wire of the triaxial mineral insulated cable is welded to the positive electrode of the acceleration sensor, the inner shield layer of the triaxial mineral insulated cable is welded to the negative electrode of the acceleration sensor, and the outer shield layer of the triaxial mineral insulated cable is welded to the outer shell of the acceleration sensor.

[0044] In this embodiment, the acceleration sensor and the three-coaxial mineral insulated cable are connected by three welding methods and a double shielding structure is adopted. Specifically, the core wire of the three-coaxial mineral insulated cable is welded to the positive electrode of the acceleration sensor, the inner shield layer of the three-coaxial mineral insulated cable is welded to the negative electrode of the acceleration sensor, and the outer shield layer of the three-coaxial mineral insulated cable is welded to the outer shell of the acceleration sensor, forming a complete electromagnetic shielding structure to effectively suppress external electromagnetic interference.

[0045] In this embodiment, the acceleration sensor and the triaxial mineral insulated cable are integrated together by welding, which reduces the risk of air leakage at the connection causing the mineral insulated cable to become damp and the insulation to deteriorate, thereby improving the quality and service life of the acceleration sensor.

[0046] In an optional embodiment, it also includes a housing;

[0047] The housing is used to encapsulate high-temperature piezoelectric sensitive components, shield electromagnetic interference and protect machinery.

[0048] In an optional embodiment, it also includes a housing;

[0049] The material of the shell includes high temperature resistant alloy material.

[0050] In this embodiment, the housing of the acceleration sensor is generally a metal housing made of a high temperature resistant alloy material, such as stainless steel or nickel-based alloy.

[0051] In an optional embodiment, it also includes a housing;

[0052] The casing and the triaxial mineral insulated cable are sealed by high-temperature sealing material.

[0053] In this embodiment, a high-temperature sealing material, such as ceramic glue or metal welding, is used to seal the housing of the acceleration sensor and the triaxial mineral insulated cable to prevent external media from invading or moisture from entering under high temperature conditions to affect the insulation of the mineral insulated cable and further affect the performance of the acceleration sensor.

[0054] In an optional embodiment, the operating temperature range of the acceleration sensor is -50°C to 500°C.

[0055] In this embodiment, the high-temperature piezoelectric sensitive element adopts high-temperature piezoelectric ceramic material (such as PZT, LiNbO3), and the shell of the acceleration sensor adopts high-temperature alloy material (such as stainless steel, nickel-based alloy) to ensure that the acceleration sensor can work stably in the temperature range of -50℃~500℃ or even higher.

[0056] In an optional embodiment, the frequency response range of the acceleration sensor is 0.2 Hz to 10 kHz.

[0057] In this embodiment, the frequency response range of the acceleration sensor can reach 0.2 Hz to 10 kHz, or even wider, which can meet the measurement requirements of vibration signals of different frequencies.

[0058] In an optional embodiment, the sensitivity range of the acceleration sensor is 50mV / g~100mV / g;

[0059] In this embodiment, by using high-performance piezoelectric materials and an optimized signal conditioning circuit, the sensitivity of the acceleration sensor can reach 50mV / g~100mV / g, or even higher, and it can accurately measure weak vibration signals.

[0060] In an optional embodiment, the anti-electromagnetic interference performance index range of the acceleration sensor is 100V / m~200V / m.

[0061] In this embodiment, the acceleration sensor can resist electromagnetic interference up to 100V / m~200V / m, or even higher, to meet the measurement requirements in a strong electromagnetic environment.

[0062] In the specific implementation process, the present disclosure provides an integrated high-temperature acceleration sensor based on a three-coaxial mineral insulated cable. The acceleration sensor includes a high-temperature piezoelectric sensitive element, a three-coaxial mineral insulated cable, a housing and a three-coaxial sealed connector. The high-temperature piezoelectric sensitive element is made of high-temperature resistant piezoelectric material and is used to convert vibration signals into electrical signals; the three-coaxial mineral insulated cable is used to transmit the charge signal output by the sensor and plays a role in shielding electromagnetic interference; the housing is used to encapsulate the sensitive element and provide mechanical protection and electromagnetic interference shielding. The acceleration sensor disclosed in the present disclosure has the advantages of high temperature resistance, electromagnetic interference resistance, radiation resistance, high reliability, high accuracy, and wide frequency response. It can meet the needs of aerospace, petrochemical, nuclear industry and other fields for high-reliability vibration monitoring, and can be widely used in high temperature, high humidity, high radiation, and electromagnetically complex environments. It solves the problems of poor working stability and low measurement accuracy of existing acceleration sensors in high temperature and strong electromagnetic interference environments. Specifically, the purposes of the present disclosure include the following aspects:

[0063] 1. Improve the working stability of the acceleration sensor in high temperature environment:

[0064] Traditional acceleration sensors usually use organic materials or ordinary metal materials, which are difficult to withstand high temperature environments and are prone to performance degradation or even failure.

[0065] The acceleration sensor disclosed herein uses high-temperature resistant piezoelectric ceramic materials, high-temperature resistant electronic components and high-temperature alloy metal casings, ensuring that the acceleration sensor can work stably in high-temperature environments, such as vibration monitoring of high-temperature equipment such as aerospace engines and petrochemical reactors.

[0066] 2. Enhance the anti-electromagnetic interference capability of the acceleration sensor:

[0067] Strong electromagnetic interference environment will cause the acceleration sensor signal to be distorted, affecting the measurement accuracy. The present invention utilizes a double shielding structure of triaxial mineral insulated cable and metal casing to effectively suppress electromagnetic interference and improve the measurement accuracy of the acceleration sensor in strong electromagnetic environments, such as vibration monitoring in nuclear power plants, high-voltage transmission lines and other strong electromagnetic environments.

[0068] 3. Realized the integrated design of acceleration sensor:

[0069] The present invention integrates the acceleration sensor and the three-coaxial mineral insulated cable by welding, thereby reducing the risk of air leakage at the connection causing the three-coaxial mineral insulated cable to become damp and the insulation to decrease, and improving the quality and service life of the acceleration sensor.

[0070] 4. Improve the reliability and service life of the acceleration sensor:

[0071] Traditional acceleration sensors are prone to failure in harsh environments and have a short service life. The acceleration sensor disclosed herein uses high temperature resistant and corrosion resistant materials and an integrated design, which improves the reliability and service life of the acceleration sensor and reduces maintenance costs.

[0072] 5. Expand the application scope of acceleration sensors:

[0073] The high-temperature, electromagnetic interference-resistant acceleration sensor provided by the present disclosure can be applied to fields where traditional sensors are incapable of handling, such as:

[0074] Aerospace field: engine vibration monitoring, aircraft structural health monitoring, etc.

[0075] Petrochemical industry: reactor vibration monitoring, pipeline vibration monitoring, etc.

[0076] Nuclear industry: nuclear reactor vibration monitoring, main pump vibration monitoring, nuclear waste treatment equipment vibration monitoring, etc.

[0077] Other fields: vibration monitoring of high-voltage transmission lines, vibration monitoring of wind turbines, etc.

[0078] In summary, the purpose of the present invention is to provide an acceleration sensor that can work stably and accurately measure vibration signals in harsh environments such as high temperature and strong electromagnetic interference, so as to meet the needs of high-reliability vibration monitoring in the fields of nuclear industry, aerospace, petrochemical industry, etc., and has broad application prospects.

[0079] For example, a nuclear power unit uses the invention patent results for loose parts monitoring in the following environment:

[0080] Vibration: 100g (maximum peak); shock: 1000g (peak); sensitivity: 10~50pC / g (nominal value); flat bandwidth: 10Hz~10kHz (±10%); resonance frequency: >30kHz; temperature range: 10℃~329℃; humidity: ≤95%RH; radiation resistance: 0.487Mgy; triaxial mineral insulated cable length: 1.5m; connector: sealed type; EMC performance: Class A passed IEC61000-4-2 / 3 / 4 / 5 / 6 / 8 / 9 / 10 / 12 / 13 / 16, MIL-STD-461E CE101\CE102\RE101\RE102.

[0081] This embodiment is based on an integrated high-temperature acceleration sensor of a triaxial mineral insulated cable, and combined with a high-temperature piezoelectric sensitive element in the acceleration sensor, so that the acceleration sensor has the advantages of high temperature resistance, anti-electromagnetic interference, high reliability, and high measurement accuracy, and solves the problems of poor working stability and low measurement accuracy of existing acceleration sensors in high temperature and strong electromagnetic interference environments.

[0082] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. An acceleration sensor, characterized in that: Including high temperature piezoelectric sensitive elements and triaxial mineral insulated cables; The high-temperature piezoelectric sensitive element is used to convert the vibration signal into a charge signal and ensure that the acceleration sensor works stably in a high-temperature environment; The triaxial mineral insulated cable is used to output the charge signal and shield electromagnetic interference.

2. The acceleration sensor according to claim 1, wherein: Also included are triaxial sealed connectors; The triaxial sealed connector is used to connect the triaxial mineral insulated cable with the flexible cable.

3. The acceleration sensor according to claim 1, wherein: The material of the high-temperature piezoelectric sensitive element includes high-temperature piezoelectric ceramic material.

4. The acceleration sensor according to claim 1, wherein: The core wire of the triaxial mineral insulated cable is welded to the positive electrode of the acceleration sensor, the inner shield layer of the triaxial mineral insulated cable is welded to the negative electrode of the acceleration sensor, and the outer shield layer of the triaxial mineral insulated cable is welded to the shell of the acceleration sensor.

5. The acceleration sensor according to claim 1, wherein: Also includes a housing; The housing is used to encapsulate the high-temperature piezoelectric sensitive element, shield electromagnetic interference and protect the machine.

6. The acceleration sensor according to claim 1, wherein: Also includes a housing; The material of the shell includes high temperature resistant alloy material.

7. The acceleration sensor according to claim 1, wherein: Also includes a housing; The shell and the triaxial mineral insulated cable are sealed by a high-temperature sealing material.

8. The acceleration sensor according to claim 1, wherein: The operating temperature range of the acceleration sensor is -50°C to 500°C.

9. The acceleration sensor according to claim 1, wherein: The frequency response range of the acceleration sensor is 0.2 Hz to 10 kHz.

10. The acceleration sensor according to claim 1, wherein: The sensitivity range of the acceleration sensor is 50mV / g~100mV / g; and / or, The anti-electromagnetic interference performance index range of the acceleration sensor is 100V / m~200V / m.

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