阅读说明：本技术 线位移传感器 (Linear displacement sensor ) 是由 聂泳忠 陈文堤 吴晓东 林明超 于 2021-07-26 设计创作，主要内容包括：本申请公开了一种线位移传感器。该线位移传感器包括：包括传感器本体,所述传感器本体包括：铁芯,位于所述传感器本体内的中空腔内；激励线圈,位于所述中空腔外,且绕设于所述铁芯上；感应线圈,所述感应线圈包括第一感应线圈和第二感应线圈,所述第一感应线圈和所述第二感应线圈分别间隔设置且分别绕设于所述激励线圈上,所述第一感应线圈包括具有第一预设匝数的绕线,所述第二感应线圈包括具有第二预设匝数的绕线,所述第一预设匝数大于或者小于所述第二预设匝数。采用本申请提供的线位移传感器能够解决现有技术中传感器的线性度较差的问题。(The application discloses a linear displacement sensor. The linear displacement sensor includes: including the sensor body, the sensor body includes: an iron core positioned within a hollow cavity within the sensor body; the excitation coil is positioned outside the hollow cavity and is wound on the iron core; induction coil, induction coil includes first induction coil and second induction coil, first induction coil with second induction coil sets up and respectively winds the interval and locates respectively on the excitation coil, first induction coil is including having the first wire winding of predetermineeing the number of turns, second induction coil is including having the second wire winding of predetermineeing the number of turns, first predetermineeing the number of turns and is greater than or be less than the second predetermines the number of turns. Adopt the relatively poor problem of the linearity of sensor among the prior art can be solved to the linear displacement sensor that this application provided.)

1. A linear displacement sensor, comprising a sensor body, characterized in that the sensor body comprises:

an iron core positioned within a hollow cavity within the sensor body;

the excitation coil is positioned outside the hollow cavity and is wound on the iron core;

induction coil, induction coil includes first induction coil and second induction coil, first induction coil with second induction coil sets up and respectively winds the interval and locates respectively on the excitation coil, first induction coil is including having the first wire winding of predetermineeing the number of turns, second induction coil is including having the second wire winding of predetermineeing the number of turns, first predetermineeing the number of turns and is greater than or be less than the second predetermines the number of turns.

2. A linear displacement sensor according to claim 1, wherein the windings in the first and second induction coils are each distributed in a stack;

the windings in the second induction coil are a preset number of layers greater than the windings in the first induction coil.

3. A linear displacement sensor according to claim 1, wherein the first and second induction coils are of equal length.

4. A linear displacement sensor according to claim 1, wherein the first and second predetermined number of turns are determined in dependence on a predetermined output voltage of the induction coil and/or a size of the displacement sensor.

5. A linear displacement sensor according to claim 1, wherein the core is biased towards the side of the first and second induction coils where there are fewer turns.

6. A linear displacement sensor according to any of claims 1 to 5, wherein the sensor body further comprises a spacer member for spacing the excitation coil from the induction coil.

7. A linear displacement sensor according to claim 6, wherein the sensor body further comprises a spacer for spacing the first and second induction coils.

8. A linear displacement sensor according to claim 7, wherein the blocking portion is provided on an outer peripheral wall of the blocking member.

9. A linear displacement sensor according to claim 7 or claim 8, wherein the blocking portion is located in a central position of the first and second induction coils.

10. A linear displacement sensor according to any of claims 1 to 5, wherein the material of the induction coil and the excitation coil is a metallic material.

Technical Field

The application relates to a sensor technology, in particular to a linear displacement sensor.

Background

With the rapid development of sensor technology, sensors are provided in many objects, such as heat-sensitive sensors, pressure sensors, etc. on airplanes. Sensors play an important role in military, life and other various aspects.

The linear displacement sensor is a differential transformer in the form of a solenoid having two induction coils and an excitation coil, wherein the two induction coils are connected in a butt joint and are wound with copper wires, so that the two coils form a coil due to the winding relationship. However, in the process of winding, because the winding width and the wire diameter of the enameled wire are not in integral multiple relation between two butted cross sections of two induction coils, and because of various problems such as accuracy and process level limitation of a winding machine, winding defects such as staggered layers, bulges, unevenness and the like easily occur near the central point of the coil (assuming that two induction coils are the same length, after two coils form one coil based on winding, near the central point of the coil), so that the linearity of the linear displacement sensor is poor, and the accuracy of the whole sensor is affected. Meanwhile, due to the fact that the severity of the winding defects near the central point of the coil is random, the winding defects of the linear displacement sensors are possibly different, the consistency among the individual sensors is poor, debugging personnel are required to debug the sensors one by one, great troubles are caused to the debugging personnel, and batch production is not facilitated.

Disclosure of Invention

The embodiment of the application aims to provide a linear displacement sensor, which can solve the problem of poor linearity of the sensor in the prior art.

The technical scheme of the application is as follows:

the embodiment of the application provides a linear displacement sensor, this linear displacement sensor includes the sensor body, and this sensor body includes:

an iron core positioned within a hollow cavity within the sensor body;

the excitation coil is positioned outside the hollow cavity and is wound on the iron core;

induction coil, induction coil includes first induction coil and second induction coil, first induction coil with second induction coil sets up and respectively winds the interval and locates respectively on the excitation coil, first induction coil is including having the first wire winding of predetermineeing the number of turns, second induction coil is including having the second wire winding of predetermineeing the number of turns, first predetermineeing the number of turns and is greater than or less than the number of turns is predetermineeing to the second.

In some embodiments of the present application, the windings in the first induction coil and the windings in the second induction coil are respectively distributed in a laminated manner; the windings in the second induction coil are a preset number of layers greater than the windings in the first induction coil.

In some embodiments of the present application, the first and second induction coils are equally long.

In some embodiments of the present application, the first and second preset number of turns are determined according to a preset output voltage of the induction coil and/or a size of the displacement sensor.

In some embodiments of the present application, the core is biased toward a side of the first and second induction coils where a number of turns of the wire is small.

In some embodiments of the present application, the sensor body further comprises a separation member for separating the excitation coil and the induction coil.

In some embodiments of the present application, the sensor body further comprises a barrier separating the first and second inductive coils.

In some embodiments of the present application, the blocking portion is provided on an outer circumferential wall of the partition member.

In some embodiments of the present application, the blocking portion is located at a middle position of the first and second induction coils.

In some embodiments of the present application, the material of the induction coil and the excitation coil is a metallic material.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

according to the technical scheme of the embodiment of the application, the linear displacement sensor comprises a sensor body, an iron core, an exciting coil and an induction coil, wherein the iron core is positioned in a hollow cavity in the sensor body, the exciting coil is positioned outside the hollow cavity and wound on the iron core, and the induction coil comprises a first induction coil and a second induction coil; the first induction coil and the second induction coil are arranged at intervals respectively and are wound on the excitation coil respectively, the first induction coil comprises a disturbing wire with a first preset number of turns, the second induction coil comprises a disturbing wire with a second preset number of turns, and the first preset number of turns is larger than or smaller than the second preset number of turns. Through setting up the wire-wound sensor of different turns on first induction coil and the second induction coil, like this, the iron core will be partial to one side induction coil that the number of turns of wire winding is few, and two induction coil's output voltage just can equal to avoid the position region of first induction coil and second induction coil handing-over, based on the removal of iron core like this, the voltage of linear displacement sensor output can present better linear relation with the iron core, has improved linear displacement sensor's linearity. Meanwhile, the two induction coil connection positions are bypassed, the influence of the windings of the two induction coil connection positions on the line displacement sensor is reduced, the debugging time of debugging personnel is reduced when the line displacement sensor is debugged, the working efficiency is improved, the consistency between the sensors is improved, and the mass production is facilitated.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application and are not to be construed as limiting the application.

FIG. 1 is a schematic diagram of a prior art linear displacement sensor;

FIG. 2 is a schematic diagram of the operation of a prior art linear displacement sensor;

FIG. 3 is a schematic diagram of the relationship between the output voltage and the position of the iron core of a prior art linear displacement sensor;

FIG. 4 is a schematic structural diagram of a linear displacement sensor provided in an embodiment of the present application;

fig. 5 is a schematic diagram of a relationship between an output voltage and a position of an iron core of a linear displacement sensor according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present application better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples consistent with certain aspects of the present application, as detailed in the appended claims.

As is known in the art, the conventional linear displacement sensor is a toroidal differential transformer, and referring to the schematic structure of the prior art linear displacement sensor shown in fig. 1, as shown in fig. 1, the linear displacement sensor has two induction coils 10, i.e. an induction coil 11 and an induction coil 12 in fig. 1, the induction coil 11 and the induction coil 12 may be separated by a barrier 13, the induction coil 11 and the induction coil 12 are wound with a wire of a metal material, such that the two coils form one coil due to the winding relationship, but during the winding process, between two cross sections of two induction coils which are butted, because the winding width and the wire diameter of the enameled wire are not in integral multiple relation, and because of various problems of the accuracy of the winding machine, the process level limitation and the like, winding defects such as a dislocation, a bulge, and an unevenness (such as the winding defect region 40 framed by a square frame in fig. 1) tend to occur near the center point of the coil. The linear displacement sensor also has an excitation coil 20 and a core 30, and the linear displacement sensor is operable by the cooperation of the induction coil, the excitation coil and the core.

Referring to the schematic diagram of the operation principle of the linear displacement sensor shown in fig. 2, an alternating current e1 is applied to the exciting coil to generate an alternating magnetic field, and two induction coils (the induction coil 11 and the induction coil 12) generate voltages of induced electromotive forces e21 and e22, respectively. Two induction coils are connected in series in an opposite direction according to the potential, the current common design is that the number of turns of the windings of the two induction coils is completely equal, when a moving iron core (the iron core is located in the hollow cavity 50 of the linear displacement sensor) is located in the middle position of the two induction coils, the induction voltages e21 and e22 generated by the two induction coils are equal in size and opposite in direction, and the output voltage Usc is 0. When the iron core deviates from the middle position, e21 and e22 are not equal in size any more, and Usc has a voltage signal output, and the voltage is converted into direct current voltage through a converter.

In an ideal situation, the output direct current voltage Usc has a good linear relationship with the offset position of the iron core. However, the output voltage of the linear displacement sensor shown in fig. 3 and the deviation position of the iron core cannot be in a linear relationship due to the winding defect, so that the linearity of the linear displacement sensor is poor, and the accuracy of the whole sensor is affected.

Meanwhile, the severity of the winding defects near the central point of the coil is random, and the winding defects of each linear displacement sensor are possibly different, so that the consistency among individual sensors is poor, debugging personnel are required to debug one by one, great troubles are caused to the debugging personnel, and batch production is not facilitated.

In order to solve the above problems, the present application provides a new linear displacement sensor, which can be seen in the following embodiments.

Referring to fig. 4, the present application provides a linear displacement sensor, which includes a sensor body, where the sensor body may specifically include the following units:

and the iron core 300 is positioned in the hollow cavity 500 in the sensor body.

The exciting coil 200 is located outside the hollow cavity 500 and wound around the iron core 300.

An induction coil 100, comprising: first induction coil 110 and second induction coil 120, first induction coil 110 is including having the first wire winding of predetermineeing the turn, and second induction coil 120 is including having the wire winding of the second predetermined turn, first predetermined turn is greater than or less than the second predetermined turn.

Wherein the first preset number of turns may be a preset number of turns of the wire wound on the first induction coil.

The second preset number of turns may be a preset number of turns of the wire wound on the second induction coil.

In some embodiments of the present application, the first predetermined number of turns and the second predetermined number of turns may be determined according to a predetermined output voltage of the induction coil and/or a size of the displacement sensor.

In some embodiments of the present application, the first predetermined number of turns is greater than or less than the second predetermined number of turns, i.e., the first predetermined number of turns and the second predetermined number of turns are different, i.e., the number of turns of the wire on the first induction coil is different from the number of turns of the wire on the second induction coil.

In some embodiments of the present application, the wire in the first induction coil and the wire in the second induction coil may be connected together.

In some embodiments of the present application, the core and the excitation coil function the same as those of the prior art linear displacement sensor, and are described in the background, and for brevity, are not described herein.

When carrying out the wire winding to first induction coil 110 and second induction coil 120, carry out the turn design of wire winding to both and become different, like this, the iron core can be partial to the less one side of wire winding turn in first induction coil and the second induction coil, and two induction coil's output voltage just can equal, and the position that uscc equals 0 just can not be like in 1 in two induction coil's intermediate position, but be partial to one side that the turn is few to can avoid the less region 400 of coil central point position linearity. This can easily improve the linearity of the linear displacement sensor. Meanwhile, the two induction coil connection positions are bypassed, the influence of the windings of the two induction coil connection positions on the line displacement sensor is reduced, the debugging time of debugging personnel is reduced when the line displacement sensor is debugged, the working efficiency is improved, the consistency between the sensors is improved, and the mass production is facilitated.

Referring to fig. 5, by using the linear displacement sensor provided by the application, the output voltage of the linear displacement sensor and the deviation position of the iron core can be well in a linear relationship, the linearity of the linear displacement sensor is greatly improved, the increase of the cost can be almost ignored, and meanwhile, a large amount of manpower, material resources and financial resources are not needed to buy a high-precision winding machine and research the winding process improvement.

The technical scheme of this application embodiment, through providing a linear displacement sensor, this linear displacement sensor includes the sensor body, and this sensor body is located this internal cavity intracavity of sensor iron core to and be located well cavity outside, and around locating the exciting coil on the iron core, and induction coil, induction coil includes: a first induction coil and a second induction coil; the first induction coil and the second induction coil are arranged at intervals respectively and are wound on the excitation coil respectively, the first induction coil comprises a disturbing wire with a first preset number of turns, the second induction coil comprises a disturbing wire with a second preset number of turns, and the first preset number of turns is larger than or smaller than the second preset number of turns. Through setting up the wire-wound linear displacement sensor of different turns on first induction coil and the second induction coil, like this, the iron core will be partial to one side induction coil that the number of turns of wire winding is few, and two induction coil's output voltage just can equal to avoid the position region of first induction coil and second induction coil handing-over, based on the removal of iron core like this, the voltage of linear displacement sensor output can present better linear relation with the iron core, has improved linear displacement sensor's linearity. Meanwhile, the two induction coil connection positions are bypassed, the influence of the windings of the two induction coil connection positions on the line displacement sensor is reduced, the debugging time of debugging personnel is reduced when the line displacement sensor is debugged, the working efficiency is improved, the consistency between the sensors is improved, and the mass production is facilitated.

For a more detailed description of the difference between the first preset number of turns on the first induction coil and the second preset number of turns on the second induction coil in the linear displacement sensor provided by the present application, the present application provides another implementation manner of the linear displacement sensor, and specifically, refer to the following embodiments.

As shown in fig. 4, the windings in the first induction coil 110 and the windings in the second induction coil 120 are respectively distributed in a laminated manner, and the windings in the second induction coil 110 are more than the windings in the first induction coil 120 by a predetermined number of layers.

The preset number of layers may be a number of layers that is set in advance to be larger in the winding of the second induction coil than in the first induction coil.

As can be seen from fig. 4, the windings on the first induction coil 110 and the windings on the second induction coil 120 may be distributed in a stacked manner, specifically, the windings may be wound from the first induction coil, then wound until the second induction coil is completed, then on the basis of the first layer, the windings may continue to be wound from the first induction coil, then wound until the second induction coil is completed, and the process is repeated. And finally, winding is not performed on the first induction coil any more, and winding is performed on the second induction coil only repeatedly all the time, so that the number of the winding on the second induction coil is larger than that of the winding on the first induction coil by a preset number of layers.

It should be noted that, the above is described by taking an example that the winding on the second induction coil 110 is more than the winding on the first induction coil 120 by a preset number of layers, and those skilled in the art should understand that, in practical applications, the winding on the first induction coil 110 may be more than the winding on the second induction coil 120 by a preset number of layers, which may be set by a user according to the needs, and is not limited herein.

In some embodiments of the present application, the predetermined number of layers may be one layer. As shown in fig. 4, the windings on the first induction coil may be one layer less than the windings on the second induction coil.

Set up the wire winding on the first induction coil and the wire winding on the second induction coil through the mode of stromatolite like this, can be very convenient, accurate set up wire winding on the first induction coil and the wire winding on the second induction coil to different, so that improve linear displacement sensor's linearity, also be convenient for simultaneously when follow-up debugging personnel debug the line displacement sensor, can directly with wire winding increase on the induction coil or reduce the one deck can, need not the debugging of relapse, debugging personnel's debugging time has been reduced.

In some embodiments of the present application, as can be seen from fig. 4, the first induction coil and the second induction coil may be equal in length, so that when the number of turns of the windings of the two induction coils is equal, the two induction coils are connected at a position where the output voltage is 0, so as to perform subsequent debugging on the linear displacement sensor.

The application provides a linear displacement sensor, through with the wire winding on the first induction coil with wire winding on the second induction coil distributes with the mode of stromatolite respectively, can be very convenient, accurate with wire winding on the first induction coil and the wire winding on the second induction coil set up to the difference, so that improve linear displacement sensor's linearity, also be convenient for simultaneously when follow-up debugging personnel debug the linear displacement sensor, can be directly with wire winding increase on the induction coil or reduce the one deck can, need not the debugging of relapse, debugging personnel's debugging time has been reduced.

For a more detailed description of the structure of the linear displacement sensor provided in the present application, embodiments of the present application provide another implementation manner of the linear displacement sensor, and refer to the following embodiments in particular.

In some embodiments of the present application, the wire displacement sensor is in the form of a hollow cylinder structure.

As shown in fig. 4, a structural diagram of the linear displacement sensor after being parsed is shown, that is, fig. 4 is a diagram obtained after the cylinder is parsed, and specifically, the diagram may be obtained by dividing the cylinder along a center line of the cylinder. As can be seen in fig. 4, the wire displacement sensor is in the form of a hollow cylinder.

In some embodiments of the present application, the hollow cavity of the cylindrical structure in fig. 4 may be used to house the core 300.

The linear displacement sensor is arranged into a hollow cylinder structure, and the hollow cavity of the cylinder can be used for accommodating the iron core, so that the iron core can work together with the exciting coil to generate voltage for later production and use.

In some embodiments of the present application, the linear displacement sensor of fig. 4 may further include a partition member 600 for separating the excitation coil and the induction coil.

The partition member 600 may be a member that partitions the excitation coil and the induction coil. For example, a metal gasket or the like.

The effect of cutting off part 600 in this application is the same with the effect of cutting off part 60 among the linear displacement sensor among the prior art, all is in order to separate exciting coil and induction coil, avoids exciting coil and induction coil winding, produces the common telegram, burns out linear displacement sensor.

In some embodiments of the present application, the sensor body may further include a barrier 700 for separating the first and second induction coils.

In some embodiments of the present application, as shown in fig. 4, the blocking part 700 may be provided on the outer circumferential wall of the blocking member 600.

In some embodiments of the present application, the function of the blocking portion 700 is the same as that of the blocking portion 13 in fig. 1, and the description thereof is omitted.

In some embodiments of the present application, the material of the induction coil and the excitation coil may both be a metallic material.

In some embodiments of the present application, the material of the metal material may be selected to meet the sensor preparation standard, and for example, the material may be a copper material or an enameled wire.

The application provides a linear displacement sensor, with linear displacement sensor setting to hollow cylinder structure, the well cavity of cylinder can be used to hold the iron core, and the iron core can work with exciting coil jointly like this, comes the voltage to carry out the production use afterwards.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art without departing from the spirit and scope of the invention.