Oil abrasive particle multichannel detection device based on Helmholtz coil

Abstract

The invention discloses an oil abrasive particle multi-channel detection device based on Helmholtz coils, and belongs to the technical field of oil abrasive particle detection, the detection structure comprises an excitation assembly and an induction assembly, the excitation assembly comprises excitation coils and a tubular outer-layer skeleton, the excitation coils are wound around the two ends of the outer portion of the tubular outer-layer skeleton, and the induction assembly is wound around the tubular outer-layer skeleton. And a uniform magnetic field is generated. The induction assembly comprises a plurality of induction units arranged side by side. According to the invention, the Helmholtz excitation coil and the multiple groups of differential induction coils are designed, and the multiple induction units are arranged side by side to form a multi-channel detection system; the Helmholtz excitation coil generates a uniform magnetic field in a detection area, so that the detection system can keep consistent sensitivity to metal abrasive particles at different radial positions, and meanwhile, the throughput of mechanical oil is ensured by parallel connection of multiple channels; the problem of inaccurate detection caused by non-uniform radial magnetic field of an induction type oil abrasive particle detection system in a large-circulation pipeline is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil wear particle detection, and in particular to an oil wear particle multi-channel detection device based on a Helmholtz coil. Background Art

[0002] Lubricating oil is an indispensable part of mechanical work. The size of wear particles in machine lubricating oil is closely related to the degree of wear of mechanical parts. The online inductive wear particle sensor, which can monitor the wear particles in lubricating oil in real time, has attracted widespread attention. The inductive wear particle sensor uses the principle of electromagnetic induction to detect wear metal particles in lubricating oil.

[0003] The traditional differential probe structure usually consists of three coils, which are wound side by side on the magnetic inert oil pipeline. The coils at both ends are wound in opposite directions as excitation coils to generate an alternating magnetic field, and the middle coil is used as an induction coil. When no wear particles flow through the probe, the magnetic fields generated by the ideally symmetrical excitation coils at the middle coil cancel each other out, and the output voltage is zero. When metal particles pass through, this balance is broken, causing changes in magnetic flux, which in turn causes changes in the output signal, and realizes the detection of ferromagnetic and non-ferromagnetic metal wear particles. This differential probe structure can improve the stability of the measurement and effectively detect metal particles in lubricating oil.

[0004] However, due to the uneven distribution of the radial magnetic field generated by the excitation coil, the same metal particle will cause different degrees of magnetic flux changes when passing through different radial positions. The sensor will output different induction signals and cannot accurately judge the size of the metal particles according to the signal size, which may cause false alarms of equipment wear. Therefore, a multi-channel detection device for oil wear particles based on Helmholtz coils is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to enable the sensor to accurately and efficiently judge the particle size in the oil without being affected by the radial position of the metal particles. A multi-channel detection device for oil wear particles based on Helmholtz coils is provided, and a new inductive sensor probe structure is designed. The sensor uses a Helmholtz coil as an excitation coil to provide a uniform detection magnetic field, and places multiple groups of differential induction coils at different radial positions inside the excitation coil, so that the induction signal size of each group of induction units for the same metal wear particle is the same, which is crucial to improving the reliability of the sensor detection results.

[0006] The present invention solves the above technical problems through the following technical solutions. The present invention includes an excitation component and an induction component. The excitation component includes an excitation coil and a tubular outer layer skeleton. The excitation coil is wound around the two outer ends of the tubular outer layer skeleton to generate a uniform magnetic field. The induction component includes multiple groups of induction units arranged side by side, which are axially parallel to the excitation coil and built into the tubular outer layer skeleton, so that the induction component as a whole is located in the uniform magnetic field detection area. The multiple induction units work together to form a multi-channel detection system, which can perform the same sensitivity detection on wear particles passing through different radial positions.

[0007] Furthermore, the excitation coils at two ends of the outside of the tubular outer layer skeleton are coaxially placed and the center distance between the coils is equal to the radius of the coils.

[0008] Furthermore, each group of induction units includes a tubular inner layer frame and an induction coil; the differential induction coil is symmetrically and reversely wound on the tubular inner layer frame.

[0009] Furthermore, when no particles pass through, the induced electromotive forces generated by the differential induction coils in each group of induction units cancel each other out, and the output signal is zero; when particles flow out of the induction channel, the magnetic field is disturbed, the magnetic flux changes, resulting in a difference in the induced electromotive force, and the output signal changes, thereby realizing the detection of wear particles.

[0010] Compared with the prior art, the present invention has the following advantages: the multi-channel oil wear particle detection device based on the Helmholtz coil utilizes the unique advantages of the Helmholtz coil and provides a highly uniform magnetic field by using it as an excitation coil; the induction component is composed of a plurality of differential induction units, and this design not only improves the sensitivity and throughput of the sensor, but also effectively reduces the influence of external interference; the induction coil is in the uniform magnetic field generated by the excitation coil, so that the sensor can accurately judge the particle size in the oil without being affected by the radial position of the metal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The excitation coil is wound around a tubular outer frame in the embodiment of the present invention;

[0012] Figure 2 is a schematic structural diagram of a single sensing unit in an embodiment of the present invention;

[0013] Figure 3 is a schematic diagram of a structure in which a plurality of sensing units are supported and fixed by a fixing block in an embodiment of the present invention;

[0014] Figure 4 is a schematic diagram of an inductive wear particle sensor according to an embodiment of the present invention;

[0015] Figure 5Schematic diagram of the overall structure of the inductive wear particle sensor in an embodiment of the present invention.

[0016] In the figure: 1. tubular outer frame; 2. excitation coil; 3. induction coil; 4. tubular inner frame; 5. fixing block; 6. induction unit. DETAILED DESCRIPTION

[0017] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0018] This embodiment provides a technical solution: a multi-channel oil wear particle detection device based on Helmholtz coils, which is used to accurately detect lubricating oil wear particles to ensure the evaluation of equipment operation status and fault prevention. Its mechanical structure is divided into two parts. The first part is an excitation component, which is composed of Helmholtz coils; the other part is an induction component, which is composed of multiple differential induction coils. The Helmholtz coil is wound on the tubular outer layer skeleton 1 as an excitation coil 2. The two excitation coils 2 are coaxially placed and the center distance between the coils is equal to the radius of the coil, thereby forming a detection area of ​​a uniform magnetic field. The induction coil 3 is arranged side by side with multiple induction units in a built-in differential manner, parallel to the axial direction of the excitation coil 2, and built into the tubular outer layer skeleton 1 of the excitation coil 2. The overall structure is made of inert magnetic material. This structure can not only make full use of the magnetic field and effectively couple the excitation magnetic field and the induction end, but also remain stable during long-term operation.

[0019] The present invention is based on the working principle of the Helmholtz coil and generates a uniform detection magnetic field. In order to detect metal particles more reliably, a new mechanical mechanism is designed, including a differential induction coil, an excitation coil, and a skeleton. When metal particles pass through the induction coil from different radial positions, the magnetic field is disturbed, and the induction coil converts the changing magnetic field into an electrical signal. Since a uniform magnetic field is formed between the Helmholtz coils, when wear particles pass through from different radial positions, the amount of magnetic field disturbance is consistent, so the induced voltage is also the same. The induction coil is composed of multiple built-in induction units, which work together to form a multi-channel detection system, realizing accurate monitoring of particles passing through different positions in the oil.

[0020] In this embodiment, if Figure 1The figure shows a schematic diagram of the structure of the excitation coil wound around the tubular outer frame. A pair of excitation coils 2 are wound on the tubular outer frame 1, located at both ends of the tubular outer frame 1. The two excitation coils 2 are coaxially placed and the center distance between the coils is equal to the radius of the coils, forming a uniform magnetic field. The inner wall of the tubular outer frame 1 is hexagonal, which is convenient for installation and fixation. It can be changed to other shapes according to the actual scene needs, such as circle, ellipse, etc.

[0021] In this embodiment, if Figure 2 As shown, it is a schematic diagram of the structure of a single induction unit 6. A pair of induction coils 3 are wound on a tubular inner layer skeleton 4 in opposite directions. The positions of the induction coils need to be adjusted so that the induced electromotive forces in the induction coils can be offset.

[0022] In this embodiment, if Figure 3 As shown, it is a schematic diagram of the structure of a sensing component assembled from a plurality of sensing units 3. Seven sensing units 6 are supported and fixed by two coaxially symmetrically arranged fixing blocks 5, and the axis of each sensing unit 3 remains parallel to the axis of the tubular outer layer skeleton 1.

[0023] It should be noted that for the convenience of installation, the outer contour of the multiple sensing units 3 combined side by side matches the inner contour of the fixed block 5, and the outer contour of the fixed block 5 matches the inner contour of the tubular outer skeleton 1. The outer contour of the multiple sensing units 3 combined side by side and the shape of the fixed block 5 can be changed to other shapes according to the actual scene needs.

[0024] In this embodiment, if Figure 4 As shown in the figure, it is a schematic diagram of the inductive wear particle sensor of the present invention, and the dotted line and arrow in the figure represent the detection area and the direction of the magnetic field, respectively. The Helmholtz coil is used as the excitation coil 2 to generate a uniform magnetic field, and the built-in induction component is used to detect the size and properties of the particles. In the detection area, since the iron particles are magnetic materials, they are affected by the magnetization effect in the magnetic field, and the generated induced magnetic field enhances the original magnetic field strength; the copper particles are non-magnetic materials, and eddy current effects will be generated in the magnetic field, generating a magnetic field in the opposite direction of the original magnetic field, weakening the magnetic field strength of the original magnetic field. When no particles pass through, the induced electromotive force generated by the induction coil 3 cancels each other out, and the output signal is zero. When the particles pass through the inside of the induction coil 3, the magnetic flux changes, resulting in a change in the induced electromotive force, thereby realizing the detection of the particle properties. When the same particle passes through different induction channels, the induction signal size of the induction unit 3 for the same metal abrasive is the same, thereby realizing the detection of wear particles passing through different radial positions.

[0025] In this embodiment, if Figure 5The figure shows the exploded structure schematic diagram of the inductive wear particle sensor of the present invention. The excitation coil 2 is wound around the two ends of the tubular outer layer skeleton 1 to generate a uniform magnetic field. The induction assembly consisting of a plurality of differential induction units 3 is placed inside the excitation coil 2 and arranged coaxially with the excitation coil 2. When the same metal particle passes through different radial positions, each induction unit 3 will generate the same output signal, thereby solving the influence of uneven radial magnetic field distribution on the accuracy of particle size detection.

[0026] In summary, the built-in differential induction wear particle sensor based on the Helmholtz coil of the above embodiment utilizes the unique advantages of the Helmholtz coil and provides a highly uniform magnetic field by using it as an excitation coil; the induction component is composed of multiple induction units, and the induction coil of each induction unit adopts a differential design. This structure not only improves the sensitivity and throughput of the sensor, but also effectively reduces the influence of external interference; the induction coil is in the uniform magnetic field generated by the excitation coil, so that the sensor can accurately judge the particle size in the oil without being affected by the radial position of the metal particles.

[0027] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A multi-channel detection device for oil wear particles based on Helmholtz coils, characterized in that: It includes an excitation component and an induction component. The excitation component includes an excitation coil and a tubular outer frame. The excitation coil is wound around the two outer ends of the tubular outer frame to generate a uniform magnetic field. The induction component includes multiple groups of induction units arranged side by side, which are axially parallel to the excitation coil and built into the tubular outer frame, so that the induction component as a whole is located in the uniform magnetic field detection area. Multiple induction units work together to form a multi-channel detection system, which can perform the same sensitivity detection on wear particles passing through different radial positions.

2. The multi-channel detection device for oil wear particles based on Helmholtz coils according to claim 1 is characterized in that: The excitation coils at two ends of the outside of the tubular outer layer skeleton are coaxially placed and the center distance between the coils is equal to the radius of the coils.

3. The multi-channel detection device for oil wear particles based on Helmholtz coils according to claim 2 is characterized in that: Each group of induction units includes a tubular inner layer frame and an induction coil; the differential induction coil is symmetrically and reversely wound on the tubular inner layer frame.

4. The oil wear particle multi-channel detection device and method according to claim 3, characterized in that: When no particles pass through, the induced electromotive forces generated by the differential induction coils in each group of induction units cancel each other out and the output signal is zero; when particles flow out of the induction channel, the magnetic field is disturbed, the magnetic flux changes, resulting in a difference in the induced electromotive force and a change in the output signal, thereby realizing the detection of wear particles.

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