Linear variable differential transformer (LVDT) displacement sensor

Abstract

The utility model discloses a linear variable differential transformer (LVDT) displacement sensor, which is characterized in that a plurality of groups of guide bearings and reset springs are arranged in a shell of the LVDT displacement sensor, and high-temperature-resistant epoxy resin is filled in an induction coil; the problems that the measurement precision is reduced and the reliability is insufficient due to thermal expansion and mechanical vibration of a traditional sensor in a high-temperature environment are solved. Specifically, the filling of the high-temperature-resistant epoxy resin effectively prevents the deformation of the induction coil at a high temperature and the reduction of the insulation performance, and the structural design of the guide bearing and the reset spring ensures the stable movement and accurate reset of the iron core in the measurement process. Therefore, compared with a traditional displacement sensor, the displacement sensor has higher performance stability, reliability and measurement accuracy in a high-temperature environment.

Description

Technical Field

[0001] This utility model relates to the field of power transformers, and in particular to an LVDT displacement sensor. Background Technology

[0002] In fields such as industrial automation, machining, aerospace, automotive manufacturing, and precision measurement, there is an extremely important need for accurate measurement of object displacement. Currently, in these scenarios, displacement sensors are generally used to detect and control key parameters such as the position and motion state of an object, thereby measuring its displacement.

[0003] Traditional displacement sensors suffer from problems such as thermal expansion, mechanical vibration, and decreased insulation performance in high-temperature environments due to their structure. These problems seriously affect the measurement accuracy and reliability of the sensors.

[0004] Therefore, how to design a displacement sensor that has higher performance stability, reliability and measurement accuracy than traditional displacement sensors in high-temperature environments is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This invention provides an LVDT displacement sensor, which has higher performance stability, reliability and measurement accuracy than traditional displacement sensors in high-temperature environments.

[0006] In a first aspect, this utility model provides an LVDT displacement sensor, comprising:

[0007] Housing, induction coil, scale;

[0008] The scale is connected to the housing, and multiple sets of induction coils are arranged in a hollow ring structure inside the housing. Each set of hollow induction coils is filled with high-temperature resistant epoxy resin.

[0009] Multiple sets of guide bearings are installed inside the housing, and a return spring is installed between the guide bearings. An iron core is installed at the center of the guide bearing. The first end of the iron core is designed with a threaded structure, and the second end of the iron core is inserted into the induction coil.

[0010] Optionally, the housing has an open, detachable structure, and the open portion of the housing is connected to a cover plate via a detachable connection, the cover plate being used to close the open portion of the housing.

[0011] Optionally, the bottom of the cover plate has a connector mounting hole, and the connector is fixed in the connector mounting hole.

[0012] Optionally, the housing is connected to the cover plate by screws.

[0013] Optionally, the scale is connected to the housing by screws.

[0014] Optionally, the induction coil is connected to the circuit board by soldering.

[0015] Optionally, the core is made of alloy steel.

[0016] This utility model has the following effects:

[0017] This utility model discloses a linear variable differential transformer (LVDT) displacement sensor. By installing multiple sets of guide bearings and return springs inside the LVDT displacement sensor housing and filling the induction coil with high-temperature resistant epoxy resin, it solves the problems of decreased measurement accuracy and insufficient reliability of traditional sensors caused by thermal expansion and mechanical vibration in high-temperature environments. Specifically, the filling with high-temperature resistant epoxy resin effectively prevents deformation and degradation of insulation performance of the induction coil at high temperatures, while the structural design of the guide bearings and return springs ensures stable movement and accurate resetting of the iron core during the measurement process. Therefore, compared with traditional displacement sensors, it has higher performance stability, reliability, and measurement accuracy in high-temperature environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of an LVDT displacement sensor provided for an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that the LVDT displacement sensor provided by this utility model is only an example and does not limit the application field of the sensor provided by this utility model.

[0022] In fields such as industrial automation, machining, aerospace, automotive manufacturing, and precision measurement, there is an extremely important need for accurate measurement of object displacement. Currently, in these scenarios, displacement sensors are generally used to detect and control key parameters such as the position and motion state of an object, thereby measuring its displacement.

[0023] With the continuous development of industrial technology, the performance requirements for displacement sensors are becoming increasingly stringent, especially in terms of stability and reliability under high-temperature environments.

[0024] Traditional displacement sensors suffer from several drawbacks. Firstly, in high-temperature environments, the induction coil and iron core undergo thermal expansion, causing changes in the gap between the coils and affecting the sensor's measurement accuracy. Secondly, the combined effects of thermal expansion and mechanical vibration at high temperatures can lead to unstable movement of the iron core within the induction coil, further degrading measurement accuracy. Simultaneously, the iron core's reset accuracy is also affected, further reducing the sensor's reliability.

[0025] In summary, traditional LVDT displacement sensors suffer from thermal expansion and mechanical vibration issues in high-temperature environments, which severely impact their measurement accuracy and reliability. Therefore, a newer displacement sensor offers superior performance stability, reliability, and measurement accuracy in high-temperature environments compared to traditional sensors.

[0026] This invention provides a linear variable differential transformer (LVDT) displacement sensor. By installing multiple sets of guide bearings and return springs within the sensor's housing and filling the induction coil with high-temperature resistant epoxy resin, it solves the problems of decreased measurement accuracy and insufficient reliability of traditional sensors caused by thermal expansion and mechanical vibration in high-temperature environments. Specifically, the high-temperature resistant epoxy resin filling effectively prevents deformation and insulation degradation of the induction coil at high temperatures, while the structural design of the guide bearings and return springs ensures stable movement and precise resetting of the core during measurement. Therefore, compared to traditional displacement sensors, it exhibits higher performance stability, reliability, and measurement accuracy in high-temperature environments.

[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following description uses the method provided in an embodiment of the present invention, executed by a first device, as an example.

[0028] Figure 1 This is a structural diagram of an LVDT displacement sensor provided for an embodiment of the present invention. Figure 1 As shown, it includes:

[0029] 1. Iron core; 2. Guide bearing; 3. Housing; 5. Induction coil; 6. Scale; 7. Circuit board; and 8. Connector.

[0030] Specifically, the housing here may include housing 3 and housing 4;

[0031] The scale 6 is installed inside the open housing 4 and connected to the sliding iron core 1;

[0032] The scale 6 is connected to the housing 3. At least a plurality of induction coils 5 are arranged in a hollow ring structure inside the housing 3, and each hollow induction coil 5 is filled with high-temperature resistant epoxy resin. In this embodiment, at least three sets of induction coils can be used as an example.

[0033] High-temperature resistant epoxy resin encapsulation provides thermal stability: High-temperature resistant epoxy resin has a low coefficient of thermal expansion, resulting in minimal changes in its physical properties at high temperatures. By filling the induction coil with high-temperature resistant epoxy resin, heat exchange between the coil and the external environment can be effectively isolated, reducing changes in coil resistance and inductance caused by temperature variations. According to the thermal expansion formula ΔL=αL0*ΔT (where ΔL is the length change, α is the coefficient of thermal expansion, L0 is the initial length, and ΔT is the temperature change), the low coefficient of thermal expansion of high-temperature resistant epoxy resin can significantly reduce the length change of the coil, thereby reducing temperature drift.

[0034] In addition, it also has mechanical stability: epoxy resin can provide good mechanical support, reduce the deformation of the coil under vibration or impact, and further improve the stability and reliability of the sensor.

[0035] A hollow-ring structure with multiple sets of induction coils enables error compensation: Arranging at least three sets of induction coils in a hollow-ring structure allows for error compensation. The output signals of multiple coils can mutually correct each other, reducing measurement errors caused by temperature variations. Signal processing algorithms can average or weight the output signals of multiple coils, further reducing the impact of temperature drift. Uniform distribution is also achieved: the hollow-ring structure ensures a more uniform magnetic field distribution, reducing measurement errors caused by magnetic field inhomogeneity and further improving measurement accuracy.

[0036] Circuit board 7 is connected to induction coil 5 and connector 8. Induction coil 5 is one of the core components of the LVDT sensor, its main function being to convert mechanical displacement into an electrical signal. When the iron core moves within the induction coil, the inductance of the coil changes, generating a voltage signal proportional to the displacement. Signal processing circuitry, such as amplifiers, filters, and analog-to-digital converters (ADCs), can be mounted on circuit board 7. These circuits amplify, filter, and digitize the weak signal generated by the induction coil, enabling it to be recognized and processed by subsequent monitoring systems.

[0037] For example, the voltage signal generated by the induction coil may be very weak (millivolt level), which can be amplified to a level suitable for transmission and processing (e.g., volt level) by an amplifier on the circuit board. Simultaneously, filters can remove noise and interference from the signal, improving the signal-to-noise ratio. Connector 8 is the interface between circuit board 7 and the external monitoring system. It transmits the processed signal from the circuit board to external monitoring equipment, such as data acquisition systems and monitoring computers. The design of connector 8 typically considers factors such as electrical isolation, interference immunity, and reliability to ensure that the signal is not affected by external interference during transmission and can be transmitted stably and accurately to the monitoring system. Circuit board 7 is connected to connector 8 by soldering or other reliable electrical connections to ensure stable signal transmission. This connection method reduces contact resistance and improves the reliability of signal transmission.

[0038] In some possible implementations, multiple sets of guide bearings 2 are installed inside the housing 3, with return springs between the guide bearings 2. An iron core 1 is mounted at the center of each guide bearing 2, with a threaded structure at one end and the other end inserted into the induction coil 5. This guide bearing design ensures the iron core maintains linear motion during sliding, reducing errors caused by friction or misalignment. The return springs quickly return the iron core to its initial position after being subjected to external force, improving the sensor's dynamic response performance. This combined design of guide bearings and return springs effectively reduces the impact of mechanical vibration on the sensor, ensuring the iron core remains stable during sliding and minimizing measurement errors caused by vibration.

[0039] This embodiment of the invention also improves stability and vibration resistance. The combined design of the return spring and guide bearing effectively reduces the impact of mechanical vibration on the sensor. This design ensures that the iron core remains stable during sliding, reducing measurement errors caused by vibration.

[0040] In some possible implementations, the housing has an open, detachable structure, with the open portion of the housing connected to a cover plate 9 via a detachable connection, the cover plate 9 being used to close the open portion of the housing.

[0041] The open portion of housing 3 can be detachably connected to a cover. This cover seals the open portion of the housing to protect the internal components and prevent dust, impurities, or external interference from entering. The advantage of this design is that when maintenance or replacement of internal components is required, the cover can be easily removed, the operation completed, and then the cover reinstalled, restoring the sensor's seal and integrity.

[0042] In some possible implementations, the bottom of the cover plate 9 has a connector 8 mounting hole. The connector 8 is fixed to the cover plate 9 through the connector mounting hole. The purpose is to: ensure electrical connection stability: by fixing the connector to the cover plate, ensure the connector remains stable during sensor operation, reduce connection loosening caused by mechanical vibration or external forces, and thus improve the reliability of signal transmission. Facilitate installation and maintenance: mounting the connector on the cover plate makes the connector's position fixed and easily accessible. This design facilitates quick connector installation during sensor assembly and also facilitates maintenance or replacement when needed. Protect the connector: the cover plate provides physical protection for the connector, preventing dust, impurities, or moisture from entering the connector's interface, extending the connector's lifespan and ensuring its long-term stable operation. Optimize space layout: mounting the connector at the bottom of the cover plate allows for efficient use of the sensor's spatial structure, making the overall sensor design more compact and facilitating installation and use in limited spaces.

[0043] In some possible implementations, the gauge is connected to the housing via screws for ease of installation: the screw connection allows for convenient installation and removal of the gauge. This connection method is simple, reliable, and facilitates quick installation or replacement of the gauge during sensor assembly or maintenance. It provides stability: the screw connection offers sufficient mechanical strength to ensure the gauge remains stable during sensor operation and will not loosen due to vibration or impact. It allows for accurate calibration: the gauge is used to visually display the sensor's measurement results. The screw connection allows for precise calibration after installation, ensuring the gauge reading matches the actual measured value. It also makes maintenance more convenient: if the gauge needs replacement or repair, the screw connection design allows for quick disassembly, reducing maintenance time and costs.

[0044] In some possible implementations, the housing 3 is connected to the cover plate 9 via screws. This connection aims to improve structural stability: the screw connection provides a high-strength mechanical connection, ensuring a secure bond between the housing 3 and the cover plate, capable of withstanding mechanical vibration and impact, thus improving the overall stability of the sensor. It also provides sealing: the screw connection allows for the addition of sealing gaskets or other sealing materials at the connection point, ensuring the internal seal of the housing, preventing dust, impurities, and moisture from entering, and protecting internal components. Furthermore, it provides ease of maintenance: the screw connection design allows for easy disassembly and reinstallation of the housing and cover plate. This facilitates the maintenance and adjustment of internal components, such as replacing induction coils, circuit boards, etc. Finally, it provides flexibility: the screw connection allows for adjustment and optimization of the sensor in different application scenarios. For example, the installation position of the housing can be adjusted as needed, or a cover plate of different specifications can be replaced.

[0045] In some possible implementations, the induction coil is connected to the circuit board via soldering to provide reliable electrical connections: soldering is a highly reliable electrical connection method that ensures a low-resistance connection between the induction coil and the circuit board. This connection method reduces contact resistance, improving the efficiency and stability of signal transmission. It also provides interference immunity: soldered connections reduce signal interference caused by poor contact or looseness, improving the sensor's interference immunity. This is especially important for sensors operating in high-noise environments. Furthermore, soldered connections offer good long-term stability, withstanding environmental factors such as temperature changes and mechanical vibrations, reducing failures caused by loose connections. Finally, soldering allows for more compact structural designs, reducing the sensor's size and weight, making it more suitable for use in space-constrained environments.

[0046] This utility model discloses a linear variable differential transformer (LVDT) displacement sensor. By installing multiple sets of guide bearings and return springs inside the LVDT displacement sensor housing and filling the induction coil with high-temperature resistant epoxy resin, it solves the problems of decreased measurement accuracy and insufficient reliability of traditional sensors caused by thermal expansion and mechanical vibration in high-temperature environments. Specifically, the filling with high-temperature resistant epoxy resin effectively prevents deformation and degradation of insulation performance of the induction coil at high temperatures, while the structural design of the guide bearings and return springs ensures stable movement and accurate resetting of the iron core during the measurement process. Therefore, compared with traditional displacement sensors, it has higher performance stability, reliability, and measurement accuracy in high-temperature environments.

[0047] The above provides a detailed description of the LVDY displacement sensor provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

[0048] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0049] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that elements inherent to a process, method, article, or apparatus that comprises a list of elements, or elements inherent to such processes, methods, articles, or apparatus, are also included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0051] The above description is merely an exemplary embodiment of this utility model and is not intended to limit the scope of protection of this utility model.

Claims

1. A linear variable differential transformer (LVDT) displacement sensor, characterized in that, include: Housing, induction coil, scale; The scale is connected to the housing, and multiple sets of induction coils are arranged in a hollow ring structure inside the housing. Each set of hollow induction coils is filled with high-temperature resistant epoxy resin. Multiple sets of guide bearings are installed inside the housing, and a return spring is installed between the guide bearings. An iron core is installed at the center of the guide bearing. The first end of the iron core is designed with a threaded structure, and the second end of the iron core is inserted into the induction coil.

2. The linear variable differential transformer (LVDT) displacement sensor according to claim 1, characterized in that, The housing has an open, detachable structure, and the open portion of the housing is connected to a cover plate via a detachable connection. The cover plate is used to close the open portion of the housing.

3. The linear variable differential transformer (LVDT) displacement sensor according to claim 2, characterized in that, The bottom of the cover plate has a connector mounting hole, and the connector is fixed in the connector mounting hole.

4. The linear variable differential transformer (LVDT) displacement sensor according to claim 3, characterized in that, The housing is connected to the cover plate by screws.

5. The linear variable differential transformer (LVDT) displacement sensor according to claim 1, characterized in that, The dial indicator is connected to the housing by screws.

6. The linear variable differential transformer (LVDT) displacement sensor according to claim 1, characterized in that, The induction coil is connected to the circuit board by soldering.

7. The linear variable differential transformer (LVDT) displacement sensor according to claim 1, characterized in that, The iron core is made of alloy steel.

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