LVDT (Linear Variable Differential Transformer) displacement sensor for adjusting type valve actuator

Abstract

The utility model provides an LVDT displacement sensor for an adjusting type valve actuator, and relates to the field of sensors.The LVDT displacement sensor for the adjusting type valve actuator comprises a coil framework, the coil framework is hollow, a connecting rod is installed in the middle of the coil framework, and the two ends of the connecting rod extend out of the coil framework; a first coil and a second coil are arranged on the side portion of the coil framework, a spring tray is arranged at the upper end of the connecting rod, a spring is arranged in the spring tray, and the bottom of the connecting rod is connected with an adjusting type valve actuator. The device is simple, stable and reliable in structure and high in measurement precision, and the control precision of the adjusting type valve can be greatly improved.

Description

Technical Field

[0001] This application relates to the field of sensors, and more specifically, to an LVDT displacement sensor for a regulating valve actuator. Background Technology

[0002] Existing technologies, mostly resistive displacement sensors, suffer from problems such as poor linearity and low accuracy, resulting in poor valve control precision. Using the displacement sensor of this invention can significantly improve the accuracy of displacement sensors used in actuators, thereby enhancing valve control precision. Existing LVDT displacement sensors generally have complex structures, high costs, large installation space requirements, and cannot be miniaturized. In other words, resistive displacement sensors have poor accuracy, and existing LVDT sensors are difficult to integrate into valve actuators. Summary of the Invention

[0003] The purpose of this application is to provide an LVDT displacement sensor for a regulating valve actuator, which can solve the above-mentioned technical problems.

[0004] This application provides an LVDT displacement sensor for a regulating valve actuator, including a coil frame, which is hollow. A connecting rod is installed in the middle of the coil frame, and both ends of the connecting rod extend out of the coil frame. A first coil and a second coil are provided on the side of the coil frame. A spring tray is provided at the upper end of the connecting rod, and a spring is provided inside the spring tray. The bottom of the connecting rod is connected to the regulating valve actuator.

[0005] Preferably, one of the first coil and the second coil is an excitation coil and the other is an magnetizing coil, and the first coil and the second coil are wound in the same direction and have the same number of turns.

[0006] Preferably, a first baffle is provided in the middle of the coil frame, a second baffle is provided at the upper end of the coil frame, and a third baffle is provided at the lower end of the coil frame. The first coil is installed between the first baffle and the second baffle, and the second coil is installed between the first baffle and the third baffle.

[0007] Preferably, heat shrink tubing is provided on the outer side of the first coil and the outer side of the second coil.

[0008] Preferably, the coil frame, the first baffle, the second baffle, and the third baffle are integrally formed.

[0009] Preferably, the spring tray and the connecting rod are connected by snap-fit ​​or thread.

[0010] Preferably, an iron core is provided between the coil frame and the connecting rod, and the iron core is press-fitted into the connecting rod.

[0011] Preferably, the connecting rod is connected to the regulating valve actuator via a threaded connection, a snap ring connection, or an end face contact connection.

[0012] The beneficial effects of this utility model are:

[0013] This utility model provides an LVDT displacement sensor for a regulating valve actuator, comprising a coil frame, the coil frame being hollow, a connecting rod mounted in the middle of the coil frame, both ends of the connecting rod extending out of the coil frame, a first coil and a second coil being disposed on the side of the coil frame, a spring tray being disposed at the upper end of the connecting rod, a spring being disposed inside the spring tray, and the bottom of the connecting rod being connected to a regulating valve actuator. This utility model has a simple, stable, reliable structure and high measurement accuracy, and can significantly improve the control accuracy of regulating valves. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the coil frame structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the coil frame structure from another perspective of the present invention.

[0018] The reference numerals in the attached figures are as follows:

[0019] 1. Coil frame; 2. Connecting rod; 3. First coil; 4. Second coil; 5. Spring tray; 6. Spring; 7. First baffle; 8. Second baffle; 9. Third baffle; 10. Iron core. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] like Figure 1-3As shown, an LVDT displacement sensor for a regulating valve actuator includes a coil frame 1, which is hollow. A connecting rod 2 is installed in the middle of the coil frame 1, with both ends of the connecting rod 2 extending out of the coil frame 1. A first coil 3 and a second coil 4 are arranged on the side of the coil frame 1. A spring tray 5 is arranged at the upper end of the connecting rod 2, and a spring 6 is arranged inside the spring tray 5. The bottom of the connecting rod 2 is connected to the regulating valve actuator. This utility model has a simple, stable, reliable structure and high measurement accuracy, which can significantly improve the control accuracy of regulating valves.

[0027] like Figure 1 As shown, in this embodiment, one of the first coil 3 and the second coil 4 is an excitation coil and the other is an excitation coil. The first coil 3 and the second coil 4 have the same winding direction and the same number of turns.

[0028] like Figure 1 As shown, the winding direction and number of turns of the first coil 3 and the second coil 4 are completely consistent. The close winding method of this solenoid is easy to process, the nonlinear error value of the sensor is good, and the detection result is accurate. Both the first coil 3 and the second coil 4 can be used as excitation coils or magnetizing coils.

[0029] like Figure 1-3 As shown in this embodiment, a first baffle 7 is provided in the middle of the coil frame 1, a second baffle 8 is provided at the upper end of the coil frame 1, and a third baffle 9 is provided at the lower end of the coil frame 1. The first coil 3 is installed between the first baffle 7 and the second baffle 8, and the second coil 4 is installed between the first baffle 7 and the third baffle 9. The first baffle 7, the second baffle 8, and the third baffle 9 of this utility model can facilitate winding while also providing insulation and isolation.

[0030] In this embodiment, heat shrink tubing is sleeved on the outer side of the first coil 3 and the outer side of the second coil 4. The LVDT sensor of this utility model is installed inside the actuator, and its installation and fixing method can be customized according to the actuator structure. Generally, there is no need to design a shell. It is only necessary to install a heat shrink tubing on the outer side of the first coil 3 and the outer side of the second coil 4 and heat it to shrink it so that the two coils are more secure and tight. This can effectively prevent the problem of poor measurement accuracy caused by field loosening due to factors such as vibration.

[0031] like Figure 2 , 3 As shown, in this embodiment, for ease of production and processing, the coil frame 1, the first baffle 7, the second baffle 8, and the third baffle 9 are integrally formed.

[0032] like Figure 1As shown, in this embodiment, the spring tray 5 and the connecting rod 2 are connected by snap-fit ​​or thread. The spring tray 5 at the top of the connecting rod 2 can be removed and the spring 6 can also be removed simultaneously.

[0033] like Figure 1 As shown, in this embodiment, an iron core 10 is provided between the coil frame 1 and the connecting rod 2. The iron core 10 is press-fitted to the connecting rod 2. The connecting rod 2 and the iron core 10 form a measuring rod. The measuring rod is connected to the adjusting actuator component and moves within the tightly wound coil group along with the movement of the external actuator. When a certain frequency excitation source is applied to both ends of the first coil 3, an induced electromotive force is generated between the second coil 4. As the iron core 10 moves, the magnetic circuit reluctance is changed, causing a change in the mutual inductance between the first coil 3 and the second coil 4, resulting in a change in the induced electromotive force, which is then output. The output voltage signal is output through a cable.

[0034] Furthermore, the measuring rod is constructed by press-fitting an iron core 10 and a connecting rod 2, with the iron core 10 being a hollow, thin-walled structure. This optimization effectively utilizes the air gap space of the LVDT structure and optimizes the magnetic circuit, thus reducing the manufacturing difficulty of the displacement sensor while also optimizing the sensor's nonlinear error.

[0035] In this embodiment, the connecting rod 2 and the regulating valve actuator are connected by a threaded connection, a snap ring connection, or an end face contact connection. Specifically, a suitable connection method can be selected according to the requirements.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An LVDT displacement sensor for a regulating valve actuator, characterized in that: The device includes a coil frame, which is hollow. A connecting rod is installed in the middle of the coil frame, and both ends of the connecting rod extend out of the coil frame. A first coil and a second coil are provided on the side of the coil frame. A spring tray is provided at the upper end of the connecting rod, and a spring is provided inside the spring tray. The bottom of the connecting rod is connected to a regulating valve actuator.

2. The LVDT displacement sensor for a regulating valve actuator according to claim 1, characterized in that: The first coil and the second coil are respectively an excitation coil and a magnetizing coil. The first coil and the second coil are wound in the same direction and have the same number of turns.

3. The LVDT displacement sensor for a regulating valve actuator according to claim 1, characterized in that: A first baffle is provided in the middle of the coil frame, a second baffle is provided at the upper end of the coil frame, and a third baffle is provided at the lower end of the coil frame. The first coil is installed between the first baffle and the second baffle, and the second coil is installed between the first baffle and the third baffle.

4. The LVDT displacement sensor for a regulating valve actuator according to claim 1, characterized in that: Heat shrink tubing is fitted around the outside of the first coil and the outside of the second coil.

5. The LVDT displacement sensor for a regulating valve actuator according to claim 3, characterized in that: The coil frame, the first baffle, the second baffle, and the third baffle are integrally formed.

6. The LVDT displacement sensor for a regulating valve actuator according to claim 1, characterized in that: The spring tray is connected to the connecting rod by snap-fit ​​or thread.

7. The LVDT displacement sensor for a regulating valve actuator according to claim 1, characterized in that: An iron core is provided between the coil frame and the connecting rod, and the iron core is press-fitted to the connecting rod.

8. The LVDT displacement sensor for a regulating valve actuator according to claim 1, characterized in that: The connecting rod is connected to the regulating valve actuator via a threaded connection, a snap ring connection, or an end face contact connection.

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