A high-response, low-delay self-inductance sensor coil structure
By improving the structure of the self-inductance sensor coil and adopting a delay reduction mechanism and low-friction design, the problems of slow response speed and large delay of traditional sensors have been solved, achieving high response speed and high-precision measurement performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUYAO ZHONGCHI ELECTRIC CO LTD
- Filing Date
- 2025-09-26
- Publication Date
- 2026-06-30
Smart Images
Figure CN224435434U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of inductive displacement sensor technology, and in particular relates to a high-response, low-delay self-inductance sensor coil structure. Background Technology
[0002] Inductive displacement sensors are widely used in industrial automation, precision measurement, and vibration monitoring due to their high precision and reliability. Their basic principle is to sense changes in the distance between the sensor and the object being measured by detecting changes in the inductance of a coil. Traditional self-inductance sensor coil structures typically consist of a coil, a magnetic core, and a movable armature. External displacement triggers a rod that changes the magnetic reluctance of the armature, thus causing a change in inductance.
[0003] In existing technologies, methods such as optimizing coil design, reducing the mass of moving parts, or improving signal processing circuits are commonly used to improve response speed. However, these methods often have limitations: for example, simply reducing the mass of moving parts may affect structural strength and stability; while circuit optimization can partially compensate for delay, it cannot fundamentally solve the response lag problem caused by mechanical structure. In particular, in the magnetic circuit system of a sensor, the frictional resistance experienced by moving parts (such as magnetic gate plates or iron cores) during operation is one of the key factors causing motion lag and increased delay. High frictional resistance not only increases the driving load but also easily causes component wear, further deteriorating dynamic response characteristics and restricting the application of sensors in high-speed and high-precision applications. To solve the above problems, a high-response, low-delay self-inductance sensor coil structure is proposed. Utility Model Content
[0004] The purpose of this invention is to provide a high-response, low-delay self-inductance sensor coil structure to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0006] This utility model relates to a high-response, low-delay self-inductance sensor coil structure, comprising a base and a coil body. The coil body is fixedly mounted on the upper surface of the base, and the upper surface of the base is provided with a shell. Multiple fixing components are fixedly connected between the shell and the base. The shell forms a magnetic circuit and provides shielding. Inside the shell is a resettable mechanism for reducing the delay of the coil body. A compensation block is fixedly connected to the upper end of the delay reduction mechanism, and a detection body is fixedly connected to the upper surface of the compensation block. When the detection body is pressed down, it pushes the delay reduction mechanism closer to the coil body to reduce the delay of the coil body.
[0007] Preferably, the delay reduction mechanism includes two trigger rods and a magnetic door plate. The upper end of the trigger rod is fixedly connected to the compensation block, and a plurality of springs are fixedly connected to the upper surface of the magnetic door plate. The upper ends of the springs are fixedly installed on the top surface of the inner wall of the outer casing.
[0008] Preferably, the upper surface of the housing has two annular grooves, and a bushing is fixedly installed in the annular groove, with the trigger rod passing through the bushing.
[0009] Preferably, the compensation block is arranged in an "I" shape.
[0010] Preferably, a gap is provided between the trigger rod and the magnetic door plate.
[0011] Preferably, a plurality of limiting rods are fixedly connected to the periphery of the inner wall of the outer shell, and a sliding groove is provided on both sides of the limiting rods. A plurality of limiting grooves are provided on the periphery of the magnetic door plate, and a ball is provided on both sides of the inner wall of the limiting groove. One end of the ball extends into the sliding groove, and a baffle is fixedly connected to the periphery of the limiting rods.
[0012] Preferably, the ball bearing is in a rolling connection with the magnetic door plate, and the ball bearing is in a rolling engagement with the slide groove.
[0013] This utility model has the following beneficial effects:
[0014] 1. This utility model can effectively reduce latency and has an extremely fast response speed. Specifically, by setting up a magnetic gate plate and a trigger rod, when the detection body is displaced, the trigger rod will be pushed to move by the compensation block. The trigger rod will further push the magnetic gate plate to move. The magnetic circuit is changed by the rapid movement of the magnetic gate plate. Its moment of inertia is much smaller than that of the traditional moving iron core or coil structure. Furthermore, by using the limit rod and the ball in the limit groove and the application of low friction bushing, the sliding friction during the movement is transformed into rolling friction, which greatly reduces the frictional resistance when the magnetic gate plate and the trigger rod move. This allows the magnetic gate plate to move quickly when the signal changes, fundamentally reducing the lag caused by mechanical movement, significantly reducing the overall latency of the sensor, and achieving a high response speed.
[0015] 2. This utility model can significantly suppress temperature drift and improve measurement accuracy and stability. Specifically, it uses two symmetrically arranged trigger rods of identical material and specifications, with their upper ends fixed to the same compensation block and their lower ends symmetrically acting on the magnetic gate plate. This provides a passive and highly reliable temperature compensation method from the mechanical structure's origin, effectively reducing the sensor's temperature coefficient and enabling it to maintain excellent zero-point stability and measurement accuracy under variable temperature conditions. It significantly improves the sensor's anti-interference ability and reliability in complex installation environments, completely avoiding measurement errors, response delays, or permanent jamming damage caused by tilting or friction of internal moving parts, and extending its service life.
[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.
[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0019] Figure 2 This is a schematic diagram of the bottom three-dimensional structure of this utility model;
[0020] Figure 3 This is a cross-sectional structural diagram of the present invention;
[0021] Figure 4 This is an exploded structural diagram of the partial magnetic door plate and the limiting rod of this utility model.
[0022] The components represented by each number in the attached diagram are listed below: 1. Base; 2. Housing; 3. Coil body; 4. Detector; 5. Trigger rod; 6. Bushing; 7. Fixing component; 8. Compensating block; 9. Spring; 10. Magnetic door plate; 11. Limiting rod; 12. Baffle; 13. Limiting groove; 14. Ball bearing; 15. Slide groove. Detailed Implementation
[0023] 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements 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 of this utility model.
[0025] Please see Figures 1-4As shown, this utility model is a high-response, low-delay self-inductance sensor coil structure, including a base 1 and a coil body 3. The coil body 3 is fixedly mounted on the upper surface of the base 1 by high-strength epoxy resin glue or screws. The base 1 is preferably made of ceramic or Invar alloy material with extremely low thermal expansion coefficient to ensure the thermal stability of the overall structure. The upper surface of the base 1 is provided with a shell 2, which is made of permalloy material with high magnetic permeability. Multiple fasteners 7 are fixedly connected between the shell 2 and the base 1. The shell 2 and the base 1 together form a complete sealed magnetic circuit, while providing efficient electromagnetic shielding for the internal mechanism and effectively isolating external interference.
[0026] The outer casing 2 contains a resettable mechanism for reducing the delay of the coil body 3. This mechanism includes two trigger rods 5 and a magnetic door plate 10. The trigger rods 5 are made of stainless steel alloy or high-strength stainless steel, and the magnetic door plate 10 is made of silicon steel sheet with high saturation magnetic induction intensity. The two trigger rods 5 are symmetrically arranged about the center of the magnetic door plate 10, with a gap between them. This gap ensures that the trigger rods 5 and the magnetic door plate 10 are in a non-contact state at room temperature. The upper end of the trigger rod 5 is fixedly connected to a compensation block 8, which is in an "I" shape. Made of titanium alloy or high-strength aluminum alloy by precision CNC machining, its hollowed-out web structure achieves extreme lightweight while ensuring extremely high rigidity. It can transmit displacement synchronously to two trigger rods 5 without deformation. Several springs 9 are fixedly connected to the upper surface of the magnetic door plate 10. The springs 9 can provide the magnetic door plate 10 with precise and strong reset force. The upper end of the springs 9 is fixedly installed on the top surface of the inner wall of the outer shell 2. The upper surface of the compensation block 8 is fixedly connected to the detection body 4. The detection body 4 is pressed down to push the delay reduction mechanism to bring it close to the coil body 3, which is used to reduce the delay of the coil body 3.
[0027] Two annular grooves are formed on the upper surface of the outer casing 2. A bushing 6 is fixedly installed in the annular groove. The bushing 6 is made of PTFE (Teflon) based composite material. This material has self-lubricating properties and an extremely low coefficient of friction. It can also reduce delay. The trigger rod 5 passes through the bushing 6.
[0028] A number of limiting rods 11 are fixedly connected to the periphery of the inner wall of the outer casing 2. The two sides of the limiting rods 11 are provided with sliding grooves 15. The periphery of the magnetic door plate 10 is provided with a number of limiting grooves 13. The two sides of the inner wall of the limiting grooves 13 are provided with balls 14. The balls 14 are constrained in the limiting grooves 13 by a precision nylon retainer (not shown in the figure). The balls 14 are in rolling connection with the magnetic door plate 10. One end of the balls 14 extends into the sliding grooves 15. The balls 14 and the sliding grooves 15 are in rolling cooperation. A baffle 12 is fixedly connected to the periphery of the limiting rods 11. The magnetic door plate 10 "rides" on the limiting rods 11 through the balls 14, completely converting possible sliding friction into rolling friction. The baffle 12 is used to prevent the magnetic door plate 10 from detaching from the limiting rods 11 under overload conditions, and plays a limiting protection role.
[0029] Working principle:
[0030] When no measurement is being performed, the magnetic gate plate 10 is supported by the spring force of the spring 9 at an initial position away from the coil body 3 (i.e., the maximum air gap position). At this time, the inductance value of the coil body 3 is at its minimum. Under the action of the compensation block 8, the gap between the lower end of the trigger rod 5 and the upper surface of the magnetic gate plate 10 remains unchanged. When the object being measured moves and pushes the detection body 4 downward, the detection body 4 drives the compensation block 8 to move downward synchronously. The compensation block 8 then pushes the two trigger rods 5 to make a precise linear motion downward along the low-friction bushing 6. After the trigger rods 5 move downward, their lower ends... The trigger rod 5 begins to contact the upper surface of the magnetic door plate 10; subsequently, the continued downward movement of the trigger rod 5 overcomes the elastic force of the spring 9, pushing the magnetic door plate 10 downward as a whole; during this process, the magnetic door plate 10 rolls within the grooves 15 of the limiting rod 11 via the balls 14 in its surrounding limiting grooves 13, achieving a near-zero frictional, strictly vertical downward translational movement, effectively avoiding any form of tilting or jamming; the downward movement of the magnetic door plate 10 rapidly reduces the air gap between it and the coil body 3, resulting in a decrease in the magnetic resistance of the entire magnetic circuit, thereby increasing the inductance of the coil body 3. The inductance change is captured in real time by the back-end fast signal processing circuit (such as a high-frequency LC oscillator and frequency discriminator) and converted into a voltage or digital signal output proportional to the displacement. Since the entire process from the movement of the magnetic gate plate to the change in inductance is almost frictionless and has minimal inertia, the sensor can achieve extremely fast response and extremely low delay in measuring the input displacement. When the measured object returns to its original position and the pressure on the detection body 4 disappears, the magnetic gate plate 10, under the strong restoring force of the spring 9, quickly rebounds upwards, pushing the trigger rod 5, compensation block 8, and detection body 4 to accurately return to their initial position. Prepare for the next measurement; when the ambient temperature changes, the two trigger rods 5 of the same material and size will generate synchronous and equal thermal expansion; this expansion will manifest as the trigger rods 5 extending downward; due to the existence of the initial gap, this extension will first offset part of the gap, rather than acting directly on the magnetic door plate 10; even if the temperature change is extremely large, causing the expansion to exceed the gap, due to the symmetry of the two rods, the force they exert on the magnetic door plate 10 is also symmetrical, mainly converted into internal stress of the magnetic door plate, and will not cause it to tilt or displace in one direction, thus passively suppressing temperature drift.
[0031] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0032] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A high-response, low-delay self-inductance sensor coil structure, comprising a base (1) and a coil body (3), wherein the coil body (3) is fixedly mounted on the upper surface of the base (1), characterized in that, The upper surface of the base (1) is provided with a housing (2), and a plurality of fixing members (7) are fixedly connected between the housing (2) and the base (1). The housing (2) forms a magnetic circuit and provides shielding; A delay reduction mechanism for the coil body (3) that can be reset is provided in the housing (2). The upper end of the delay reduction mechanism is fixedly connected with a compensation block (8). The upper surface of the compensation block (8) is fixedly connected with a detection body (4). When the detection body (4) is pressed down, it pushes the delay reduction mechanism to make it close to the coil body (3) for reducing the delay of the coil body (3).
2. The high-response, low-delay self-inductance sensor coil structure according to claim 1, characterized in that, The delay reduction mechanism includes two trigger rods (5) and a magnetic door plate (10). The upper ends of the trigger rods (5) are fixedly connected with the compensation block (8). A plurality of springs (9) are fixedly connected to the upper surface of the magnetic door plate (10), and the upper ends of the springs (9) are fixedly installed on the top surface of the inner wall of the housing (2).
3. The high-response, low-delay self-inductance sensor coil structure according to claim 2, characterized in that, Two annular grooves are formed in the upper surface of the housing (2), and bushings (6) are fixedly arranged in the annular grooves. The trigger rods (5) penetrate through the bushings (6).
4. The high-response, low-delay self-inductance sensor coil structure according to claim 1, characterized in that, The compensation block (8) is arranged in an "I" shape.
5. The high-response, low-delay self-inductance sensor coil structure according to claim 2, characterized in that, A gap is provided between the trigger rod (5) and the magnetic door plate (10).
6. The high-response, low-delay self-inductance sensor coil structure according to claim 2, characterized in that, A plurality of limiting rods (11) are fixedly connected to the circumferential side surface of the inner wall of the housing (2). Sliding grooves (15) are formed on both side surfaces of the limiting rods (11). A plurality of limiting grooves (13) are formed on the circumferential side surface of the magnetic door plate (10). Ball bearings (14) are arranged on both sides of the inner wall of the limiting grooves (13). One end of the ball bearings (14) extends into the sliding grooves (15), and a baffle (12) is fixedly connected to the circumferential side surface of the limiting rods (11).
7. The high-response, low-delay self-inductance sensor coil structure according to claim 6, characterized in that, The ball bearings (14) are in rolling connection with the magnetic door plate (10), and the ball bearings (14) are in rolling fit with the sliding grooves (15).