CN216898727U

CN216898727U - Probe of inductive displacement sensor and inductive displacement sensor

Info

Publication number: CN216898727U
Application number: CN202220153558.3U
Authority: CN
Inventors: 易孟良; 吴剑锋; 易华南; 邓华; 曾亮
Original assignee: Zhuzhou Catic Science And Technology Development Co ltd
Current assignee: Zhuzhou Catic Science And Technology Development Co ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-07-05
Anticipated expiration: 2032-01-20

Abstract

The utility model discloses a probe of an inductive displacement sensor and the inductive displacement sensor, wherein the probe comprises: the detection coil comprises a plurality of detection coils and a mesh shielding cover arranged between the detection coils, wherein an insulation distance d is arranged between the detection coils and the mesh shielding cover. The probe of the inductance type displacement sensor is internally provided with the plurality of detection coils, each detection coil is isolated by the mesh shield cover, the distance between the detection coils can be effectively reduced, the signal interference between the detection coils is eliminated, the insulation distance d is arranged between the detection coils and the mesh shield cover, and the mesh shield cover is prevented from influencing the measurement range of the detection coils.

Description

Probe of inductive displacement sensor and inductive displacement sensor

Technical Field

The utility model relates to the field of sensors, in particular to a probe of an inductive displacement sensor and the inductive displacement sensor.

Background

Most existing inductive displacement sensor probes adopt a single-coil structure, when the probes are in failure or a controller circuit is aged, drifted in temperature and subjected to cold welding, output signals of the sensors are completely invalid or distorted, so that the authenticity of the signals is influenced, and monitored equipment cannot be started normally or operated normally or real equipment faults cannot be judged.

The most effective and direct method for improving the measurement reliability is to adopt a mode of simultaneously carrying out parallel measurement on one measurement point by a plurality of coils, and when signals detected by the plurality of coils are the same, the measurement signal of the measurement point is considered to be real and credible. However, when a common inductive displacement sensor is used for vibration and displacement measurement, the size of a target surface of a metal measured body is required to be more than 3 times of the diameter of a probe coil, when multi-probe redundancy measurement is carried out, the center distance between probes is required to be more than 3 times of the diameter of the probes, otherwise, mutual coupling interference can occur between the probe coils due to the self-resonance frequency or the high-frequency characteristic of the excitation frequency of the probe coils. The same-frequency synchronous driving type eddy current displacement sensor can shorten the center distance between the two probes to about 1.5 times of the diameter of the probes, but cannot be used redundantly in places with severely limited target surface size of a measured body.

SUMMERY OF THE UTILITY MODEL

The utility model provides a probe of an inductive displacement sensor and the inductive displacement sensor, which are used for solving the technical problem that a redundant probe coil cannot be used when the size of a target surface of a measured object is severely limited by the existing inductive displacement sensor.

In order to solve the above technical problem, in a first aspect, the present invention provides a probe of an inductive displacement sensor, including: the detection coil comprises a plurality of detection coils and mesh shielding covers arranged between the detection coils, wherein an insulation distance d is arranged between the detection coils and the mesh shielding covers.

As a further improvement of the above technical solution: the detection coils are specifically three and respectively comprise a first detection coil, a second detection coil and a third detection coil.

As a further improvement of the above technical solution: mesh shield specifically is two, is first mesh shield and second mesh shield respectively, first mesh shield is located first detection coil with between the second detection coil, second mesh shield is located second detection coil with between the third detection coil.

As a further improvement of the above technical solution: the first detection coil, the second detection coil, the third detection coil, the first mesh shielding cover and the second mesh shielding cover are concentrically nested, and the diameters of the first detection coil, the first mesh shielding cover, the second detection coil, the second mesh shielding cover and the third detection coil are sequentially from small to large.

As a further improvement of the above technical solution: the first detection coil, the second detection coil, the third detection coil, the first mesh shield and the second mesh shield are arranged in parallel, and the diameters of the first detection coil, the second detection coil and the third detection coil are the same.

As a further improvement of the above technical solution: mesh shield cover is including the radial surface, axial bottom surface and the axial sensitive face that are equipped with a plurality of through-holes, the detection coil with be equipped with insulation distance d between the radial surface, the detection coil with distance between the axial sensitive face is less than the detection coil with the distance of axial bottom surface.

As a further improvement of the above technical solution: the aperture of the radial surface is the same as that of the axial bottom surface, and the aperture of the axial sensitive surface is larger than that of the axial bottom surface.

Has the advantages that: the probe of the inductive displacement sensor is internally provided with the detection coils, and each detection coil is isolated by the mesh shield, so that the distance between the detection coils can be effectively reduced, the signal interference between the detection coils is eliminated, and the insulation distance d is arranged between each detection coil and the mesh shield, so that the mesh shield is prevented from influencing the measurement range of the detection coils.

In a second aspect, the present invention further provides an inductive displacement sensor, comprising a signal processing circuit, and further comprising the probe of the first aspect,

each of the detection coils is electrically connected to one of the signal processing circuits and one of the excitation sources through an extension cable, respectively, and the signal processing circuit includes a detection circuit electrically connected to the detection coil and a normalization circuit electrically connected to the detection circuit.

Has the advantages that: the inductive displacement sensor provided by the utility model provides an independent excitation source and a signal processing circuit for each detection coil, simultaneously enables all the detection coils to detect the same target point, does not affect each other among the monitoring coils, can realize the redundant detection of the same target point by a plurality of detection coils, can avoid the influence on data measurement caused by the damage of the detection coils, and can also improve the data reliability through mutual verification of a plurality of groups of data.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic cross-sectional view of a probe head of an inductive displacement sensor in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an inductive displacement sensor probe according to another preferred embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of an inductive displacement sensor probe according to yet another preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of the configuration of the mesh shield of the inductive displacement sensor probe of the preferred embodiment of the present invention;

FIG. 5 is a schematic view of the configuration of the radial face of the mesh shield of the preferred embodiment of the present invention;

FIG. 6 is a schematic view of the axial underside of a mesh shield of a preferred embodiment of the present invention;

FIG. 7 is a schematic view of the axially sensitive face of the mesh shield of the preferred embodiment of the utility model;

FIG. 8 is a schematic signal transmission diagram of the inductive displacement sensor of the present invention.

The reference numerals in the figures denote:

1. a detection coil; 11. a first detection coil; 12. a second detection coil; 13. a third detection coil; 2. a mesh shield; 21. a first mesh shield; 22. a second mesh shield; 23. a radial surface; 24. an axial bottom surface; 25. an axially sensitive face.

Detailed Description

The embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways as defined and covered by the claims.

In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The use of the terms "comprising" or "including" and the like in the description of the present application is intended to indicate that the element or item preceding the term covers the element or item listed after the term and its equivalents, without excluding other elements or items.

It should also be noted that, unless expressly stated or limited otherwise, the words "mounted," "connected," and the like in the description of the present application are to be construed broadly and encompass, for example, connections that may be fixed or removable or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.

Example 1, a probe of an inductive displacement sensor.

The probe of the inductive displacement sensor of the embodiment comprises: the detection coil comprises a plurality of detection coils 1 and mesh shielding cases 2 arranged between the detection coils 1, wherein an insulation distance d is arranged between the detection coils 1 and the mesh shielding cases 2.

According to design requirements, the number of the detection coils 1 of the present embodiment may be any number, specifically, in the present embodiment, three detection coils are specifically provided, namely, a first detection coil 11, a second detection coil 12 and a third detection coil 13, and in other embodiments, as shown in fig. 3, six detection coils 1 may be provided, and all six detection coils 1 are separated by a mesh shield 2 in a shape of a Chinese character 'jing'.

Since the mesh shields 2 are provided between each of the detection coils 1 for partitioning the detection coils 1, and since the number of the detection coils 1 of the present embodiment is three, in the present embodiment, the mesh shields 2 are specifically two, that is, a first mesh shield 21 and a second mesh shield 22, respectively, the first mesh shield 21 is provided between the first detection coil 11 and the second detection coil 12, and the second mesh shield 22 is provided between the second detection coil 12 and the third detection coil 13.

The first mesh shield 21 is located between the first detection coil 11 and the second detection coil 12 and used for shielding and isolating the high-frequency mutual coupling interference between the first detection coil 11 and the second detection coil 12, and the second mesh shield 22 is located between the second detection coil 12 and the third detection coil 13 and used for shielding and isolating the high-frequency mutual coupling interference between the second detection coil 12 and the third detection coil 13.

In the probe of the inductive displacement sensor of this embodiment, the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shielding case 21, and the second mesh shielding case 22 are concentrically nested, and the diameters of the first detection coil 11, the first mesh shielding case 21, the second detection coil 12, the second mesh shielding case 22, and the third detection coil 13 are sequentially from small to large.

The first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 21 and the second mesh shield 22 are concentrically nested, since the detection coils 1 and the mesh shields 2 are each provided with an insulating distance d therebetween, the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 21, and the second mesh shield 22 have the same shape, may have a circular, elliptical, square or the like shape, and the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 21 and the second mesh shield 22 in the present embodiment are described as circular shapes, therefore, as shown in fig. 1, the cross sections of the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 21, and the second mesh shield 22 are one concentric circle.

As shown in fig. 4-7, in the probe of the inductive displacement sensor of the present embodiment, the mesh shield 2 includes a radial surface 23, an axial bottom surface 24 and an axial sensitive surface 25, and since the detection coil 1 is made of a metal material, which may affect the measurement range of the coil, an insulation distance d needs to be provided between the detection coil 1 and the radial surface 23, and the distance between the detection coil 1 and the axial sensitive surface 25 is smaller than the distance between the detection coil 1 and the axial bottom surface 24.

Wherein, the aperture of the radial surface 23 is the same as that of the axial bottom surface 24, and the aperture of the axial sensitive surface 25 is larger than that of the axial bottom surface 24.

The mesh shielding case 2 adopts an omnibearing three-dimensional shielding structure through a radial surface 23, an axial bottom surface 24 and an axial sensitive surface 25, and the protected detection coil 1 is positioned near the axial sensitive surface 25.

As shown in fig. 5, the radial surface 23 of the mesh shield 2 is used to shield the lateral electromagnetic interference of the protected detection coil 1, and tests prove that the mutual interference of the adjacent detection coils 1 mainly comes from the radial surface 23, and because the eddy current loss of the protected detection coil 1 in this direction is smaller or the direction can be set farther from the edge of the detection coil 1, the influence on the measuring range of the sensor is smaller, the aperture is set tighter, the mesh opening is smaller, and the wall thickness is thicker.

As shown in fig. 6, the axial bottom surface 24 of the mesh shield 2 is used to shield and isolate the electromagnetic wave from the rear end of the adjacent detection coil 1, and since the two directions can be set far from the edge of the detection coil 1, which is far greater than the range of the sensor, the arrangement of the aperture is very compact, the mesh opening is smaller, the wall thickness is thicker, and a better shielding effect can be achieved.

As shown in fig. 7, the axial sensitive surface 25 of the mesh shield 2 is the working sensitive surface and the eddy current detection surface of the protected detection coil 1, in order to reduce the eddy current loss of the metal mesh in this direction, the mesh aperture can be set to be sparse, the wall thickness can be as thin as possible, the size of the mesh opening can be adjusted in response according to the actual excitation frequency of the probe, or the opening can be in a longitudinal or transverse cord shape to ensure the measurement range.

Since the detection coil 1 cannot contact the radial surface 23, the axial bottom surface 24, and the axial sensitive surface 25 of the mesh shield 2, it is necessary to fill an insulating material, such as a material such as polyester resin, between the mesh shield 2 and the detection coil 1 to fix the detection coil 1.

In this embodiment, the first detection coil 11, the second detection coil 12 and the third detection coil 13 use high-frequency excitation signals with different frequencies, and since the penetration depth of the eddy current of the high-frequency excitation signals with different frequencies on the target surface of the measured metal increases with the decrease of the frequency, when cracks occur on the surface or inside of the target surface of the measured metal, the signal values output by the three coils will be different, so that the structure and the parallel operation excitation method can also monitor the surface cracks or the internal cracks of the measured metal.

The probe of the inductive displacement sensor of the present embodiment shields and isolates the high-frequency mutual coupling interference between the first detection coil 11 and the second detection coil 12 by the first mesh shield 21, shields and isolates the high-frequency mutual coupling interference between the second detection coil 12 and the third detection coil 13 by the second mesh shield 22, and the insulation distance d is arranged between the detection coil 1 and the mesh shield 2, so that the mesh shield 2 is prevented from influencing the measurement range of the detection coil 1, the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 21 and the second mesh shield 22 are concentrically nested and are all round, the detection surface area of the probe is greatly reduced, therefore, the redundancy of the detection coils 1 is realized while the area of the detection surface of the probe is reduced, the measurement range of the detection coils 1 is not influenced, and the reliability and the stability of the probe of the inductive displacement sensor are greatly improved.

Example 2, a probe of an inductive displacement sensor.

The present embodiment differs from embodiment 1 in that the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 2, and the second mesh shield 22 of the present embodiment are arranged in this order from left to right, and the cross section thereof is as shown in fig. 2, and the first detection coil 11, the second detection coil 12, the third detection coil 13, the first mesh shield 2, and the second mesh shield 22 are arranged side by side. So as to meet the requirements of some special places.

The probe of the inductive displacement sensor of the embodiment can reduce the area of the detection surface of the probe and simultaneously realize redundancy of a plurality of detection coils 1, does not influence the measurement range of the detection coils 1, and greatly improves the reliability and stability of the probe of the inductive displacement sensor.

Embodiment 3, an inductive displacement sensor.

As shown in fig. 8, the inductive displacement sensor of this embodiment includes a signal processing circuit, and further includes the probe of embodiment 1,

each detection coil 1 is electrically connected to a signal processing circuit and an excitation source through an extension cable, respectively, and the signal processing circuit includes a detection circuit electrically connected to the detection coil and a normalization circuit electrically connected to the detection circuit.

Each detection coil 1 of the inductive displacement sensor of the embodiment, the high-frequency excitation signal, the detection circuit and the normalization circuit of the inductive displacement sensor are independent into a channel, and the channels are independent and parallel to measure the same target point and do not affect each other. The structural mode that the mesh shielding cover 2 is additionally arranged between the detection coils 1 of all layers can effectively and omnidirectionally shield high electromagnetic wave interference from the lateral side, the rear end and the sensitive end of the protected detection coil 1. A certain insulation distance d is reserved between each channel detection coil 1 and the mesh shielding case 2, and the measurement range is not influenced. When the signals monitored by a plurality of coils or coils above 2/3 are the same or within a specified fluctuation threshold range, the external judgment circuit considers the signals to be the true signals of the measuring points, so that the measuring results are true, reliable and credible. The method is suitable for special application places with high frequency response requirements, strong real-time requirements and complex electromagnetic environments.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A probe for an inductive displacement sensor, comprising: the detection coil comprises a plurality of detection coils (1) and mesh shielding cases (2) arranged between the detection coils (1), wherein an insulation distance d is arranged between the detection coils (1) and the mesh shielding cases (2).

2. The probe of an inductive displacement sensor according to claim 1, characterized in that the number of detection coils is three, respectively a first detection coil (11), a second detection coil (12) and a third detection coil (13).

3. The probe of an inductive displacement sensor according to claim 2, characterized in that said mesh shields (2) are two, respectively a first mesh shield (21) and a second mesh shield (22), said first mesh shield (21) being arranged between said first detection coil (11) and said second detection coil (12), said second mesh shield (22) being arranged between said second detection coil (12) and said third detection coil (13).

4. The probe of the inductive displacement sensor according to claim 3, wherein the first detection coil (11), the second detection coil (12), the third detection coil (13), the first mesh shield (21) and the second mesh shield (22) are concentrically nested, and the diameters of the first detection coil (11), the first mesh shield (21), the second detection coil (12), the second mesh shield (22) and the third detection coil (13) are sequentially from small to large.

5. A probe of an inductive displacement sensor according to claim 3, characterized in that said first (11), second (12), third (13) detection coils, first (2) and second (22) mesh shields are arranged in parallel, and the diameters of said first (11), second (12) and third (13) detection coils are the same.

6. The probe of an inductive displacement sensor according to claim 1, characterized in that the mesh shield (2) comprises a radial surface (23) provided with a plurality of through holes, an axial bottom surface (24) and an axial sensitive surface (25), an insulating distance d is provided between the detection coil (1) and the radial surface (23), and the distance between the detection coil (1) and the axial sensitive surface (25) is smaller than the distance between the detection coil (1) and the axial bottom surface (24).

7. The probe of an inductive displacement sensor according to claim 6, characterized in that the radial face (23) has the same aperture as the axial bottom face (24), the axial sensitive face (25) having a larger aperture than the axial bottom face (24).

8. An inductive displacement sensor comprising signal processing circuitry, and further comprising a probe according to any one of claims 1 to 7,

each detection coil (1) is electrically connected with one signal processing circuit and one excitation source through an extension cable respectively, and the signal processing circuit comprises a detection circuit electrically connected with the detection coil (1) and a normalization circuit electrically connected with the detection circuit.