WO2020057080A1

WO2020057080A1 - Multi-parameter lc sensor for monitoring state of rotating structure

Info

Publication number: WO2020057080A1
Application number: PCT/CN2019/079133
Authority: WO
Inventors: 王立峰; 董蕾; 黄庆安
Original assignee: 东南大学
Priority date: 2018-09-18
Filing date: 2019-03-21
Publication date: 2020-03-26
Also published as: CN109238313B; CN109238313A

Abstract

A multi-parameter LC sensor for monitoring the state of a rotating structure (4), comprising a plurality of capacitive sensors (2) and an inductive unit (1) which are provided on the rotating structure (4), the inductive unit (1) comprises a plurality of single-turn coils (11, 12, 13) connected in sequence, two ends of each single-turn coil (11, 12, 13) are respectively connected to a capacitive sensor (2), an output coil (3) is provided on the outer periphery of the inductive unit (1), the output coil (3) is used for passively and wirelessly outputting a plurality of resonant frequencies generated by the plurality of capacitive sensors (2), and each resonance frequency corresponds to a different state parameter of the rotating structure (4). Said sensor implements real-time monitoring of a plurality of state parameters of the rotating structure (4), can be used for a long period of time without maintenance, and is suitable for use in harsh environments such as a high-temperature environment and an oil polluted environment.

Description

Multi-parameter LC sensor for condition monitoring of rotating structure

Technical field

The invention relates to the field of pressure sensors, in particular to a multi-parameter LC sensor for monitoring the state of a rotating structure.

Background technique

A large number of rotating structures are used in various industrial production equipment and transportation equipment, such as bearing structures and gear structures. These rotating structures work under severe conditions such as high loads and high speeds for a long time, and are one of the most prone to failure in mechanical equipment. Therefore, it is very necessary to monitor the working condition of the rotating structure.

Because the rotating structure is in a rotating state when working, the traditional wired sensor is not suitable for real-time monitoring of the state of the rotating structure. At present, wireless active sensor systems are mainly used for condition monitoring of rotating structures at critical locations. Wireless active sensors generally use RF transceiver circuits for data transmission, and their transceiver circuits rely on batteries for power. Due to the battery, this sensor system cannot work for a long time without interruption. And because it contains active components, its operating temperature should not be too high.

Mechanical rotating parts are usually in high temperature or oily environments. In such harsh environments, active circuits and batteries should not be used in sensors. The wireless passive LC sensor uses the principle of inductive near-field coupling to transmit data and does not require battery power. At the same time, the LC sensor system is composed of passive components, which is especially suitable for the harsh environment of high temperature oil pollution. Therefore, the wireless passive multi-parameter LC sensor system is an ideal solution for the condition monitoring of rotating structures.

Summary of the Invention

In view of the problems existing in the prior art, the present invention proposes a multi-parameter LC sensor for monitoring the state of a rotating structure. A multi-resonance point LC resonance circuit is formed by a plurality of capacitive sensors and an inductance unit, and the difference is wirelessly and passively read. The resonance frequency value obtains the real-time status of the rotating structure, and realizes real-time monitoring of multiple state parameters of the rotating structure. In addition, it adopts wireless passive reading mode, which can be used for long-term maintenance-free use, suitable for use in harsh environments such as high temperature and oil pollution.

In order to achieve the above technical objectives, the embodiments of the present invention adopt the following technical solutions:

A multi-parameter LC sensor for monitoring the state of a rotating structure. The sensor includes an inductive unit and a plurality of capacitive sensors provided on the rotating structure. The inductive power supply includes a plurality of single-turn coils connected in sequence. Capacitive sensors are connected at both ends, and an output coil is provided on the periphery of the inductive unit. The output coil is used for passive wireless output of multiple resonant frequencies generated by multiple capacitive sensors, each resonant frequency and different state parameters of the rotating structure. Corresponding.

Further, the inductance unit includes a first single-turn coil, a second single-turn coil, and a third single-turn coil connected in order, and the sizes of the first single-turn coil, the second single-turn coil, and the third single-turn coil are sequentially increased.

Further, the shape of each single-turn coil is an arc shape.

Further, each single-turn coil includes a metal layer, an insulation layer, and an adhesion layer which are sequentially arranged from top to bottom.

Further, each single-turn coil is fixed on the rotating structure through an adhesive layer.

Further, the plurality of capacitive sensors include a first capacitive sensor, a second capacitive sensor, and a third capacitive sensor, two ends of the first capacitive sensor are fixed to both ends of the first single-turn coil, and the second capacitive sensor Both ends of the sensor are fixed to both ends of the second single-turn coil, and both ends of the third capacitive sensor are fixed to both ends of the third single-turn coil.

Further, the output coil outputs a first resonant frequency generated by the first capacitive sensor, a second resonant frequency generated by the second capacitive sensor, and a third resonant frequency generated by the third capacitive sensor.

Further, the inductance unit, the output coil and the rotating structure are arranged coaxially.

Further, the shape of the output coil is a circular ring.

Compared with the prior art, the present invention has the following technical effects:

The present invention provides a multi-parameter LC sensor for monitoring the state of a rotating structure. The sensor includes an inductive unit and a plurality of capacitive sensors provided on the rotating structure. The inductive power source includes a plurality of single-turn coils connected in sequence. Capacitive sensors are connected to both ends of the single-turn coil, and an output coil is provided on the periphery of the inductive unit. The output coil is used for passive wireless output of multiple resonant frequencies generated by multiple capacitive sensors, each resonant frequency and rotation structure. Corresponding to the different status parameters. The above sensor is provided with a plurality of interconnected capacitive sensors and inductive units on the rotating structure. When the capacitive sensor detects a change in the state of the rotating structure, the corresponding resonant frequency will be changed accordingly, and different resonances can be read passively through wireless. The frequency value can obtain the real-time status of the rotating structure, so as to realize the real-time status monitoring of the rotating structure. In addition, the wireless passive reading method is used. The sensor has no leads connected and no battery is required. It can be used for long-term maintenance-free use after installation. Use in harsh environments such as high temperature and oil pollution.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a multi-parameter LC sensor for condition monitoring of a rotating structure according to an embodiment of the present invention; FIG.

2 is a plan structural view of an inductor unit according to an embodiment of the present invention;

Among them: 1. Inductive unit; 11. First single-turn coil; 12. Second single-turn coil; 13. Third single-turn coil; 14. Metal layer; 15. Insulation layer; 16. Adhesive layer; 2. Capacitive Sensor; 21, first capacitive sensor; 22, second capacitive sensor; 23, third capacitive sensor; 3, output coil; 4, rotating structure.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In addition, the term "and / or" in this article is only an association relationship describing the associated object, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, and A and B exist simultaneously, There are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

As shown in FIG. 1, an embodiment of the present invention proposes a multi-parameter LC sensor for monitoring the state of a rotating structure. The sensor includes an inductive unit 1 and a plurality of capacitive sensors 2 provided on the rotating structure. Multiple single-turn coils connected in sequence, each end of each single-turn coil is connected to a capacitive sensor, an output coil 3 is provided on the periphery of the inductance unit, and the output coil 3 is used for passive wireless output of multiple capacitive sensors. Multiple resonance frequencies, each of which corresponds to a different state parameter of the rotating structure.

The above-mentioned multi-parameter LC sensor is provided with a plurality of interconnected capacitive sensors and inductive units on the rotating structure. When the capacitive sensor detects a change in the state of the rotating structure, the corresponding resonant frequency will be changed accordingly. The real-time status of the rotating structure can be obtained by taking different resonance frequency values, so as to realize the real-time status monitoring of the rotating structure. In addition, the wireless passive reading method is used. The sensor has no leads connected and no battery is required. It can be maintenance-free for a long time after installation Use, suitable for use in harsh environments such as high temperature and oil pollution.

Preferably, the inductance unit 1 includes a plurality of first single-turn coils, and the number of single-turn coils is greater than or equal to two, such as three, four, five, and the like.

Preferably, the inductance unit 1 includes a first single-turn coil 11, a second single-turn coil 12 and a third single-turn coil 13, a first single-turn coil 11, a second single-turn coil 12, and a third single-turn coil connected in this order. The size of 13 increases in sequence, and the three single-turn coils are connected end to end.

Preferably, the shape of each single-turn coil is a shape such as an arc, a square, a pentagon, or a triangle.

Preferably, the shape of each single-turn coil is an arc shape, that is, the radius of the arc gradually increases from one end to the other end, and is arranged coaxially with the rotating structure so that each single-turn coil can rotate around the rotating structure. Or rotate synchronously with the rotating structure.

Preferably, as shown in FIG. 2, each single-turn coil includes a metal layer 14, an insulating layer 15, and an adhesive layer 16 which are disposed in this order from top to bottom. The material of the metal layer 14 is any kind of conductive material; the material of the insulating layer 15 is a resin material capable of performing an insulating function; and the adhesive layer 16 functions as a connection.

Preferably, each single-turn coil is fixed on the rotating structure through the adhesive layer 16.

Preferably, the plurality of capacitive sensors include a first capacitive sensor 21, a second capacitive sensor 22, and a third capacitive sensor 23. Both ends of the first capacitive sensor 21 are fixed to both ends of the first single-turn coil 11. Both ends of the second capacitive sensor 12 are fixed to both ends of the second single-turn coil 22, and both ends of the third capacitive sensor 23 are fixed to both ends of the third single-turn coil 13.

Preferably, the output coil 3 outputs a first resonant frequency generated by the first capacitive sensor, a second resonant frequency generated by the second capacitive sensor, and a third resonant frequency generated by the third capacitive sensor.

Preferably, the inductance unit 1, the output coil 3 and the rotating structure 4 are arranged coaxially.

Preferably, the shape of the output coil 3 is a circular ring.

The working principle of the invention is that an LC resonance circuit will be formed after the inductor and the capacitor are connected. By connecting three capacitive sensors (ie, 21, the first capacitive sensor; 22, the second capacitive sensor; 23, the third capacitive sensor) to the three-segment single-turn coil (11, the first single-turn coil) of the inductance unit, respectively 12, the second single-turn coil; 13, and the third single-turn coil) are connected to obtain an LC resonance circuit containing three resonance frequencies. When one or more of the capacitive sensors detects a change in the state of the rotating structure, a corresponding change in one or more resonant frequencies of the multi-parameter LC sensor is caused. Based on the near-field coupling principle between planar inductors, the readout coil connected to the impedance analyzer can wirelessly and passively read these resonance frequency values and their changes, thereby obtaining the real-time state of the rotating structure.

Further, in order to be able to monitor the state of the rotating structure in real time, before the measurement, the sensor of the present invention needs to be calibrated with a readout coil connected to an impedance analyzer to establish a relationship between the three resonance frequencies and the state parameters of the three capacitive sensors. During the measurement, the three resonance frequencies of the sensor of the present invention are read out using a readout coil connected to an impedance analyzer, and compared with the calibration values, three state parameters of the rotating structure to be measured can be obtained.

In summary, the present invention provides a multi-parameter LC sensor for monitoring the state of a rotating structure. The sensor includes an inductive unit and a plurality of capacitive sensors provided on the rotating structure. The inductive power supply includes a plurality of single-turn coils connected in sequence. Capacitive sensors are connected to both ends of each single-turn coil, and an output coil is provided on the periphery of the inductive unit. The output coil is used for passive wireless output of multiple resonant frequencies generated by multiple capacitive sensors. Each resonant frequency Corresponds to different state parameters of the rotating structure. The above sensor is provided with a plurality of interconnected capacitive sensors and inductive units on the rotating structure. When the capacitive sensor detects a change in the state of the rotating structure, the corresponding resonant frequency will be changed accordingly, and different resonances can be read passively through wireless. The frequency value can obtain the real-time status of the rotating structure, thereby real-time monitoring of the rotating structure. In addition, the wireless passive reading method is adopted, the sensor is connected without leads, and no battery is required. After installation, it can be maintenance-free for a long time, suitable for use in harsh environments such as high temperature and oil pollution.

Through the description of the foregoing embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of the description, only the division of the above functional units is used as an example. In practical applications, the above functions may be allocated as required. Completed by different functional units, that is, the internal structure of the device is divided into different functional units to complete all or part of the functions described above. For specific working processes of the system, device, and unit described above, reference may be made to corresponding processes in the foregoing method embodiments, and details are not described herein again.

The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present invention. It should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A multi-parameter LC sensor for monitoring the state of a rotating structure, characterized in that the sensor includes an inductive unit and a plurality of capacitive sensors provided on the rotating structure, and the inductive power supply includes a plurality of single-turn coils connected in sequence. Capacitive sensors are connected to both ends of each of the single-turn coils, and an output coil is provided on an outer periphery of the inductance unit, and the output coil is used for passively and wirelessly outputting the power generated by the multiple capacitive sensors. Resonance frequencies, each of which corresponds to a different state parameter of the rotating structure.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 1, wherein the inductance unit comprises a first single-turn coil, a second single-turn coil and a third single-turn coil connected in sequence, The sizes of the first single-turn coil, the second single-turn coil, and the third single-turn coil are sequentially increased.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 1, wherein each of the single-turn coils has an arc shape.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 1, wherein each of the single-turn coils includes a metal layer, an insulation layer, and an adhesion layer which are sequentially arranged from top to bottom.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 4, wherein each of the single-turn coils is fixed to the rotating structure through the adhesive layer.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 2, wherein the plurality of capacitive sensors include a first capacitive sensor, a second capacitive sensor, and a third capacitive sensor, The two ends of the first capacitive sensor are fixed to both ends of the first single-turn coil, the two ends of the second capacitive sensor are fixed to both ends of the second single-turn coil, and the third capacitor Both ends of the sensor are fixed to both ends of the third single-turn coil.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 6, wherein the output coil outputs a first resonant frequency generated by the first capacitive sensor and a second resonant frequency generated by the second capacitive sensor. And a third resonant frequency generated by the third capacitive sensor.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 1, characterized in that said inductance unit, said output coil and said rotating structure are arranged coaxially.
The multi-parameter LC sensor for condition monitoring of a rotating structure according to claim 1, wherein the shape of the output coil is a circular ring.