A heat dissipation structure based on a multi-segment coil type LVDT sensor

Abstract

This invention discloses a heat dissipation structure based on a multi-segment coil LVDT sensor. The heat dissipation structure includes a tubular frame and a shell. Along the axial direction of the tubular frame, multiple protrusions are spaced apart on its outer surface, forming a receiving groove between adjacent protrusions for winding the coil. The inner surface of the tubular frame has at least one axial heat dissipation groove. The shell surrounds the outer surface of the tubular frame. At least one protrusion has a radial heat dissipation channel that penetrates the tubular frame, the axial heat dissipation groove, and the shell. This invention utilizes an axial heat dissipation groove to transfer heat from the middle of the tubular frame's inner cavity to the two ends with better heat dissipation conditions. The combination of axial heat dissipation grooves and radial heat dissipation channels improves the heat dissipation performance of the LVDT sensor while achieving miniaturization.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, specifically relating to a heat dissipation structure based on a multi-segment coil LVDT sensor. Background Technology

[0002] Sensor technology plays a vital role in modern society, with applications spanning a wide range of fields. In industrial automation, sensor technology is a core tool for achieving production process control and monitoring. Sensors can detect and measure various physical quantities, such as temperature, pressure, liquid level, and flow rate, thereby helping to improve production efficiency and product quality. Sensor technology also plays a crucial role in precision measurement. Modern precision measurement technology is a comprehensive discipline integrating optics, electronics, sensors, imaging, manufacturing, and computer technology. Linear variable differential transformers (LVDTs), with their high precision, excellent linearity, and anti-interference capabilities, have become an important tool in the field of precision measurement.

[0003] LVDT sensors play a crucial role in numerous fields due to their high precision, wide measurement range, and excellent linearity. In industrial automation, LVDT sensors are widely used for displacement monitoring and control of various mechanical equipment. For example, in machine manufacturing, LVDTs are used in precision positioning systems for CNC machine tools to ensure machining accuracy and efficiency. Furthermore, in automated production lines, LVDT sensors are used to measure workpiece positioning and movement, ensuring the accuracy and efficiency of the production process. In automotive manufacturing, LVDTs are used for testing engines and transmissions, measuring the displacement of pistons, valves, and gears to help optimize engine performance and transmission efficiency. These applications not only improve production efficiency but also enhance system reliability and stability.

[0004] With technological advancements, higher demands are being placed on the static characteristics of LVDT sensors, such as linearity and sensitivity. Improving the static characteristics of sensors can significantly enhance their measurement accuracy and reliability, making them more advantageous in precision measurement and control applications. Furthermore, with the trend towards miniaturization in devices, the application of miniaturized LVDT sensors is becoming increasingly widespread. For example, in the aerospace field, miniature LVDT sensors are used to measure the displacement of aircraft control surfaces, flaps, and landing gear to ensure aircraft stability and safety. In medical devices, miniature LVDTs are used to detect displacement in surgical robots and radiotherapy equipment to ensure a safe distance between the device and the patient. These applications require sensors to maintain high accuracy while adapting to smaller spaces and more complex environmental conditions.

[0005] Currently, existing LVDT sensors typically use external fans or water cooling devices for heat dissipation, but this design is complex, costly, and increases the size of the sensor, which is not conducive to miniaturization design. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, this invention provides a heat dissipation structure based on a multi-segment coil LVDT sensor.

[0007] The technical problem to be solved by this invention is achieved through the following technical solution: In a first aspect, the present invention provides a heat dissipation structure based on a multi-segment coil LVDT sensor, comprising a tubular frame and a housing; Along the axial direction of the tubular skeleton, multiple protrusions are spaced apart on the outer surface of the tubular skeleton, and a receiving groove is formed between two adjacent protrusions. The receiving groove is used to wind the coil; and at least one axial heat dissipation groove is provided on the inner surface of the tubular skeleton. The outer shell surrounds the outer surface of the tubular skeleton; At least one protruding position is provided with a radial heat dissipation channel, which penetrates the tubular skeleton, the axial heat dissipation groove and the outer shell.

[0008] The present invention provides a heat dissipation structure based on a multi-segment coil LVDT sensor. It adopts axial heat dissipation grooves to transfer heat from the middle of the tubular skeleton cavity to the two ends with better heat dissipation conditions. At the same time, it adopts a heat dissipation method that combines axial heat dissipation grooves and radial heat dissipation channels, which improves the heat dissipation performance of the LVDT sensor while achieving miniaturization design.

[0009] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a heat dissipation structure based on a multi-segment coil LVDT sensor provided in an embodiment of the present invention; Figure 2 This is an exploded view of a heat dissipation structure based on a multi-segment coil LVDT sensor provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the axial heat dissipation groove provided in an embodiment of the present invention.

[0011] Figure label: 1-Tubular skeleton; 2-Primary coil receiving slot; 3-Secondary coil receiving slot; 4-Axial heat dissipation grooves; 5-Outer shell; 51-Upper shell; 52-Lower shell; 6-Radial heat dissipation channels. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0013] Firstly, see [the following] Figures 1 to 3 This invention provides a heat dissipation structure based on a multi-segment coil LVDT sensor, including a tubular frame 1 and a housing 5.

[0014] Along the axial direction of the tubular skeleton 1, a plurality of protrusions are provided at intervals on the outer surface of the tubular skeleton 1, and a receiving groove is formed between two adjacent protrusions. The receiving groove is used for winding the coil. At least one axial heat dissipation groove 4 is provided on the inner surface of the tubular skeleton 1. The outer shell 5 surrounds the outer surface of the tubular skeleton 1. At least one protrusion position is provided with a radial heat dissipation channel 6, which penetrates the tubular skeleton 1, the axial heat dissipation groove 4 and the outer shell 5.

[0015] For example, the protrusion can be an annular protrusion provided around the outer surface of the tubular skeleton 1. Multiple receiving grooves can be formed on the outer surface of the tubular skeleton 1 through the protrusion. The multiple receiving grooves can be the same size, which is convenient for manufacturing.

[0016] In this embodiment, when the excitation voltage of the LVDT sensor is applied to the primary coil in the middle, the movement of the magnetic core inside the tubular frame 1 induces a voltage in the secondary coil, thereby generating heat in the region of the primary and secondary coils. Part of the heat generated by the coil flows outward through the radial heat dissipation channels 6, while the other part flows inward into the axial heat dissipation grooves 4, ultimately being discharged into the air from the inside. This forms a heat dissipation structure that combines radial and axial elements, improving the sensor's heat dissipation performance without adding an external heat dissipation device. This achieves both miniaturization of the LVDT sensor and improved heat dissipation performance.

[0017] In one alternative implementation, the width at both ends of the axial heat dissipation groove 4 is smaller than the width at the middle position.

[0018] For example, since the excitation voltage of the primary coil is much greater than the induced voltage of the secondary coil, the heat generated in the primary coil is greater than the heat generated in the secondary coil, causing the heat to be mainly concentrated in the middle region of the tubular frame 1. Part of the heat generated by the primary coil flows outward through the radial heat dissipation channels 6, and the other part flows inward into the axial heat dissipation groove 4. Since the cavity where the coil is located has high heat, the heat in the axial heat dissipation groove 4 does not return to the cavity where the coil is located through the radial heat dissipation channels 6 on the tubular frame 1, but flows directly to the outside. Therefore, part of the heat flowing into the axial heat dissipation groove 4 flows to the outside, and the other part flows to the middle to form a high-temperature region, controlling the direction of heat flow in the axial heat dissipation groove 4 from the middle to both ends. In this embodiment, the width of the axial heat dissipation groove 4 at both ends is smaller than that at the middle, and the overall width changes linearly. Corresponding to the high-temperature area in the middle of the coil, the width of the axial heat dissipation groove 4 is increased to increase the heat dissipation area and air residence time. Corresponding to the areas at both ends of the coil, the width of the axial heat dissipation groove 4 is narrowed, which accelerates the air flow rate in the axial heat dissipation groove 4 through the Venturi effect and improves the heat dissipation efficiency.

[0019] In one alternative implementation, the depth at both ends of the axial heat dissipation groove 4 is less than the depth at the middle position.

[0020] Similarly, in this embodiment, the depth at both ends of the axial heat dissipation groove 4 is less than the depth at the middle position. This can accelerate the airflow in the axial heat dissipation groove 4 through the Venturi effect, thereby improving the heat dissipation efficiency.

[0021] In one alternative implementation, the maximum depth of the axial heat dissipation groove 4 does not exceed one-tenth of the thickness of the tubular skeleton 1.

[0022] Specifically, limiting the maximum depth of the axial heat dissipation groove 4 to no more than one-tenth of the thickness of the tubular skeleton 1 can improve heat dissipation efficiency while ensuring the strength of the skeleton.

[0023] In one alternative implementation, the plurality of receiving slots includes a primary coil receiving slot 2 and a plurality of secondary coil receiving slots 3, the secondary coil receiving slots 3 being symmetrically distributed on both sides of the primary coil receiving slot 2, and at least two secondary coil receiving slots 3 being provided on either side of the primary coil receiving slot 2.

[0024] For example, at least five receiving slots are formed, with one primary coil receiving slot 2 located in the middle for receiving the primary coil, and at least four secondary coil receiving slots 3 located at both ends for receiving the secondary coils. The at least two secondary coil receiving slots 3 at each end segment the secondary coil, which can improve the linearity of the sensor.

[0025] In one alternative implementation, the number of turns of the secondary coil accommodated in the secondary coil accommodating slot 3 gradually increases along the direction from the primary coil accommodating slot 2 to any end of the tubular frame 1.

[0026] For example, if two secondary coil receiving slots 3 are provided on one side of the primary coil, the length ratio of the secondary coil receiving slot 3 closer to the primary coil to the secondary coil receiving slot 3 farther away can be set to 4:6. Here, the size of all secondary coil receiving slots 3 can be set to the same size (or the same size as the primary coil receiving slot 2), only changing the number of turns of the wound secondary coil; or the size of the secondary coil receiving slot 3 can be set according to the different number of turns of the secondary coil, which is not limited in this embodiment.

[0027] When the LVDT sensor is in operation, the heat dissipation conditions at both ends of the tubular frame 1 are better, while the middle area, surrounded by coils, experiences more severe heat accumulation, resulting in an uneven temperature rise distribution between the two ends and the middle of the tubular frame 1. This uneven temperature rise can easily lead to inconsistent changes in coil resistance, causing zero-point drift and nonlinear errors. To address this, this embodiment designs the segmented secondary coil with an asymmetrical distribution of more turns at both ends and fewer turns in the middle. The secondary coil receiving slots 3 near the two ends of the sensor accommodate more turns of the secondary coil, while the secondary coil receiving slots 3 near the middle accommodate fewer turns of the secondary coil, distributing more heat to the areas with better heat dissipation conditions at both ends, thereby improving the sensor's heat dissipation performance.

[0028] In one alternative implementation, two radial heat dissipation channels 6 are provided at each protrusion position, and the axes of the two radial heat dissipation channels 6 are perpendicular to each other.

[0029] For example, four axial heat dissipation grooves 4 are provided, each corresponding to the position of the radial heat dissipation channel 6 on the inner surface of the tubular skeleton 1.

[0030] In one alternative implementation, the housing 5 includes an upper housing 51 and a lower housing 52, which are detachably connected.

[0031] For example, the upper housing 51 and the lower housing 52 can be connected by pins to achieve a detachable connection.

[0032] The heat dissipation structure based on a multi-segment coil LVDT sensor in this embodiment has the following advantages compared to the prior art: 1. By winding the secondary coil in segments with unequal number of turns, the magnetic field and temperature rise can be distributed more evenly, leakage flux can be reduced, and heat accumulation can be improved, thereby improving the linearity and zero drift of the sensor.

[0033] 2. By adopting axially variable diameter heat dissipation grooves, more heat is transferred to the two ends with better heat dissipation conditions, the heat load in the middle area is reduced, and the variable diameter heat dissipation grooves form a directional airflow with large-capacity absorption at the hot end and accelerated exhaust at the cold end, thus reducing the overall thermal resistance.

[0034] 3. The overall design adopts a heat dissipation method that combines axial heat dissipation grooves and radial heat dissipation channels, which improves heat dissipation performance while achieving miniaturization.

[0035] In a second aspect, embodiments of the present invention also provide an LVDT sensor, including a heat dissipation structure, a coil, and a magnetic core as described in the first aspect of a multi-segment coil-based LVDT sensor; the magnetic core is located in the inner cavity of the tubular skeleton 1, and the coil is located in a receiving groove.

[0036] The LVDT sensor of this embodiment has the following advantages compared with the prior art: 1. By winding the secondary coil in segments with unequal number of turns, the magnetic field and temperature rise can be distributed more evenly, leakage flux can be reduced, and heat accumulation can be improved, thereby improving the linearity and zero drift of the sensor.

[0037] 2. By adopting axially variable diameter heat dissipation grooves, more heat is transferred to the two ends with better heat dissipation conditions, the heat load in the middle area is reduced, and the variable diameter heat dissipation grooves form a directional airflow with large-capacity absorption at the hot end and accelerated exhaust at the cold end, thus reducing the overall thermal resistance.

[0038] 3. The overall design adopts a heat dissipation method that combines axial heat dissipation grooves and radial heat dissipation channels, which improves heat dissipation performance while achieving miniaturization.

[0039] It should be noted that the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature 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. Moreover, the specific features or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0041] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings and the disclosure in carrying out the claimed invention. In the description of the invention, the word "comprising" does not exclude other components or steps, "a" or "an" does not exclude a plurality, and "a plurality" means two or more, unless otherwise explicitly specified. Furthermore, while different embodiments may describe certain measures, this does not mean that these measures cannot be combined to produce good results.

[0042] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A heat dissipation structure based on a multi-segment coil LVDT sensor, characterized by, It includes a tubular skeleton (1) and a shell (5); Along the axial direction of the tubular skeleton (1), a plurality of protrusions are provided at intervals on the outer surface of the tubular skeleton (1), and a receiving groove is formed between two adjacent protrusions. The receiving groove is used to wind the coil; and at least one axial heat dissipation groove (4) is provided on the inner surface of the tubular skeleton (1). The outer shell (5) surrounds the outer surface of the tubular skeleton (1); At least one of the protruding positions is provided with a radial heat dissipation channel (6), which penetrates the tubular skeleton (1), the axial heat dissipation groove (4) and the outer shell (5).

2. The heat dissipation structure based on a multi-segment coil LVDT sensor according to claim 1, wherein, The width at both ends of the axial heat dissipation groove (4) is smaller than the width at the middle position.

3. The heat dissipation structure of a multi-segment coil type LVDT sensor according to claim 2, wherein, The depth of the two ends of the axial heat dissipation groove (4) is less than the depth of the middle position.

4. The heat dissipation structure of a multi-segment coil type LVDT sensor according to claim 3, wherein, The maximum depth of the axial heat dissipation groove (4) does not exceed one-tenth of the thickness of the tubular skeleton (1).

5. The heat dissipation structure based on a multi-segment coil LVDT sensor according to claim 1, characterized in that, The plurality of receiving slots include a primary coil receiving slot (2) and a plurality of secondary coil receiving slots (3). The secondary coil receiving slots (3) are symmetrically distributed on both sides of the primary coil receiving slot (2). At least two secondary coil receiving slots (3) are provided on either side of the primary coil receiving slot (2).

6. A heat dissipation structure based on a multi-segment coil LVDT sensor according to claim 5, characterized in that, Along the direction from the primary coil receiving slot (2) to any end of the tubular frame (1), the number of turns of the secondary coil received in the secondary coil receiving slot (3) gradually increases.

7. The heat sink structure for a multi-segment coil LVDT sensor according to claim 1, wherein Two radial heat dissipation channels (6) are provided at each of the protrusion positions, and the axes of the two radial heat dissipation channels (6) are perpendicular to each other.

8. The heat dissipation structure based on a multi-segment coil LVDT sensor according to claim 1, characterized in that, The outer casing (5) includes an upper casing (51) and a lower casing (52), which are detachably connected.

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