A center heat conduction reinforced temperature sensor packaging structure

Abstract

The utility model relates to a kind of center heat conduction reinforced temperature sensor packaging structure, including inner tube, outer tube, front end pipe, platinum resistance, cable, handle and plug;The inner tube is coaxially arranged in the outer tube, and the tail of the inner tube is flush with the tail of the outer tube;The platinum resistance is fixed in the front end of the inner tube;The front end pipe is coaxially bonded in the front end of the outer tube by sealing glue, the inner tube is opened with slot in the cable position of passing out, pouring sealing glue into the slot until the sealing glue fills the gap between the cable and the inner tube;The handle is coaxially inserted into the tail of the outer tube, and the plug is detachably connected with the tail of the handle.In the technical scheme of the utility model, the front end chamber surrounded by inner tube and front end pipe is filled with heat-conducting magnesium powder, achieving platinum resistance full-wrapping center heat conduction, which significantly shortens the thermal response time and improves temperature measurement accuracy compared to traditional pipe wall heat conduction.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor technology, and in particular to a centrally thermally enhanced temperature sensor packaging structure. Background Technology

[0002] Existing temperature sensor packaging often uses a single metal tube to encapsulate the sensing element or simple potting, which has significant drawbacks: 1. Low thermal conductivity: The long thermal conduction path between the sensing element and the external environment results in high thermal resistance, slow temperature response, and inability to capture dynamic temperature changes; 2. Poor measurement accuracy: Without targeted thermal insulation design, the external ambient temperature can easily be conducted to the sensing element through the shell, causing errors; 3. Insufficient stability: The simple sealing structure allows moisture and dust to easily penetrate, leading to performance degradation of the sensing element and shortening its lifespan; 4. Inconvenient maintenance: Some are one-piece molded structures, requiring disassembly for later maintenance, which is complex.

[0003] In scenarios requiring high precision and response speed, such as real-time temperature measurement of industrial motors and temperature monitoring of chemical reactions in laboratories, existing structures are insufficient to meet the demands. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the purpose of this utility model is to provide a centrally thermally enhanced temperature sensor packaging structure, which is suitable for scenarios requiring accurate and rapid acquisition of temperature parameters, such as industrial equipment monitoring, environmental meteorological data collection, and precise temperature measurement in laboratories.

[0006] To achieve the above objectives, the present invention provides a centrally thermally enhanced temperature sensor packaging structure, including an inner tube, an outer tube, a front-end tube, a platinum resistance thermometer, a cable, a handle, and a plug. The inner tube is coaxially inserted inside the outer tube, and the tail of the inner tube is flush with the tail of the outer tube. The platinum resistance thermometer is fixed to the front end of the inner tube. The front-end tube is coaxially bonded to the front end of the outer tube with sealant. A groove is provided in the inner tube corresponding to the cable exit position. Sealant is injected into the groove until it fills the gap between the cable and the inner tube, thereby achieving a fixed seal between the platinum resistance thermometer, the cable, and the inner tube. The handle is coaxially inserted into the tail of the outer tube, and the plug is detachably connected to the tail of the handle.

[0007] In the above technical solution, preferably, a front end chamber is formed inside the outer tube by the inner tube and the front section tube, the platinum resistance is located in the front end chamber, and the front end chamber is filled with a thermally conductive filler, and the thermally conductive filler completely covers the platinum resistance.

[0008] In any of the above technical solutions, preferably, the diameter of the outer tube is 3mm-5mm and the wall thickness is 0.1mm-0.3mm, the length difference between the inner tube and the outer tube is 28mm-32mm, and the outer side of the inner tube at the joint between the inner tube and the outer tube is uniformly coated with sealant. The fixation and sealing of the inner tube and the outer tube are achieved by the adhesiveness and clamping force of the sealant.

[0009] In any of the above technical solutions, preferably, the front end tube is a hollow structure, which is bonded to the front end face of the outer tube by sealant, and the axis of the front end tube is collinear with the axis of the outer tube to form a front end sealing structure.

[0010] In the above technical solution, preferably, the wall thickness of the front tube is less than the wall thickness of the outer tube.

[0011] In the above technical solution, preferably, the inner wall of the handle is uniformly coated with sealant, and after the handle is inserted into the tail of the outer tube, the gap between the handle and the outer tube is filled with sealant to achieve a sealed connection between the handle and the outer tube.

[0012] In any of the above technical solutions, preferably, the plug is connected to the handle tail by a thread, the center of the plug has a channel for the cable to pass through, and the inner wall of the channel is sealed with the cable by sealant.

[0013] In any of the above technical solutions, preferably, the thermally conductive filler is thermally conductive magnesium powder; and / or the inner tube, the outer tube, the front end tube and the plug are all made of stainless steel; and / or the handle is a polytetrafluoroethylene handle.

[0014] Compared with existing technologies, the advantages of the center-heat-conductivity enhanced temperature sensor packaging structure provided by this utility model are as follows: This utility model's center-heat-conductivity enhanced temperature sensor packaging structure combines performance breakthroughs and practical value: its innovative use of an inner tube and a front-end tube to surround a front-end chamber filled with thermally conductive magnesium powder achieves full-wrap center heat conduction of the platinum resistance thermometer, which significantly shortens the thermal response time and improves temperature measurement accuracy compared to traditional tube wall heat conduction; the multi-dimensional sealing design covers the tube body mating area, front end face, handle connection part, and cable exit channel, which can isolate water vapor impurities under harsh working conditions; the stainless steel tube body takes into account both corrosion resistance and strength, the PTFE handle ensures operational safety, and the compact size of 3mm-5mm diameter is suitable for narrow spaces, which not only solves the pain points of slow response and poor sealing of traditional sensors, but also meets the high-precision temperature measurement needs of industry, and has significant practical and promotional value. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 A three-dimensional structural diagram of the temperature sensor packaging structure according to an embodiment of the present invention is shown; Figure 2 This diagram shows a three-dimensional view of the temperature sensor packaging structure according to an embodiment of the present invention after the outer tube has been removed. Figure 3 A cross-sectional view of the temperature sensor packaging structure according to an embodiment of the present invention is shown; in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1. Inner tube; 11. Groove; 2. Outer tube; 3. Front end tube; 4. Platinum resistance thermometer; 5. Cable; 6. Handle; 7. Plug; 8. Front end chamber. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figures 1 to 3 As shown, a center-heat-conductivity enhanced temperature sensor packaging structure according to an embodiment of the present invention includes an inner tube 1, an outer tube 2, a front end tube 3, a platinum resistance thermometer 4, a cable 5, a handle 6, and a plug 7. The inner tube 1 is coaxially inserted inside the outer tube 2, and the tail of the inner tube 1 is flush with the tail of the outer tube 2. The platinum resistance thermometer 4 is fixed to the front end of the inner tube 1. The front end tube 3 is coaxially bonded to the front end of the outer tube 2 with sealant. The inner tube 1 has a slot 11 corresponding to the position where the cable 5 passes through. Sealant is poured into the slot 11 until the sealant fills the gap between the cable 5 and the inner tube 1 to achieve a fixed seal between the platinum resistance thermometer 4, the cable 5, and the inner tube 1. The handle 6 is coaxially inserted into the tail of the outer tube 2, and the plug 7 is detachably connected to the tail of the handle 6.

[0019] In this embodiment, the coaxial nesting design of the inner tube 1 and the outer tube 2, combined with the sealing method of the groove 11 and the potting, not only is the platinum resistance 4 and the cable 5 firmly fixed, but also lays the foundation for subsequent enhanced heat conduction and sealing protection, ensuring the installation stability of the sensor core components.

[0020] like Figure 3As shown, in the above embodiment, preferably, a front end chamber 8 is formed inside the outer tube 2 by the inner tube 1 and the front end tube, the platinum resistance 4 is located in the front end chamber 8, and the front end chamber 8 is filled with a thermally conductive filler, and the thermally conductive filler completely covers the platinum resistance 4.

[0021] In this embodiment, the sealed space of the front chamber 8 is equipped with a fully enclosed thermally conductive filler, which allows the heat of the measured medium to be transferred to the platinum resistance 4 quickly and evenly. This not only significantly shortens the thermal response time, but also avoids the temperature measurement error caused by local temperature difference in the platinum resistance 4, thus significantly improving the temperature measurement accuracy and response efficiency of the sensor.

[0022] In any of the above embodiments, preferably, the outer tube 2 has a diameter of 3mm-5mm and a wall thickness of 0.1mm-0.3mm, the length difference between the inner tube 1 and the outer tube 2 is 28mm-32mm, and the outer side of the inner tube 1 at the joint with the outer tube 2 is uniformly coated with sealant. The inner tube 1 and the outer tube 2 are fixed and sealed by the adhesiveness and clamping force of the sealant.

[0023] Preferably, the outer tube 2 has a diameter of 4 mm and a wall thickness of 0.2 mm, the length difference between the inner tube 1 and the outer tube 2 is 30 mm, the amount of thermally conductive filler can be accurately calculated based on the size of the outer tube 2 and the volume of the platinum resistance 4, the front end chamber 8 is filled with thermally conductive filler and then injected with sealant, and the front end tube 3 is bonded and sealed to the front end of the outer tube 2 through the sealant.

[0024] In this embodiment, the small diameter and thin wall design of the outer tube 2 take into account both the compactness and thermal conductivity of the sensor. The length difference of 28mm-32mm can meet the front-end layout requirements of the platinum resistance 4, while the sealant at the joint achieves seamless fixation between the inner tube 1 and the outer tube 2, which not only ensures the compactness of the structure, but also eliminates the risk of leakage at the gap between the tubes.

[0025] like Figure 3 As shown, in any of the above embodiments, preferably, the front end tube 3 is a hollow structure, which is bonded to the front end face of the outer tube 2 by sealant, and the axis of the front end tube 3 is collinear with the axis of the outer tube 2 to form a front end sealing structure.

[0026] In this embodiment, the coaxial bonding design of the hollow front tube 3 not only does not hinder the conduction of heat into the cavity, but also constructs a reliable front sealing barrier, which can effectively isolate external dust and moisture from entering the front cavity 8. At the same time, the coaxial structure ensures the straightness of the heat conduction path, further improving the temperature measurement stability.

[0027] In the above embodiments, preferably, the wall thickness of the front end tube 3 is less than the wall thickness of the outer tube 2.

[0028] In this embodiment, the thin-walled design of the front tube 3 can reduce the heat conduction loss in the wall of the front tube 3, allowing the heat to reach the thermally conductive filler more quickly, while the relatively thick wall of the outer tube 2 ensures the overall mechanical strength of the sensor, achieving a balance between front-end thermal conductivity and overall structural stability.

[0029] In the above embodiments, preferably, the inner wall of the handle 6 is uniformly coated with sealant. After the handle 6 is inserted into the tail of the outer tube 2, the gap between the handle 6 and the outer tube 2 is filled with sealant to achieve a sealed connection between the handle 6 and the outer tube 2.

[0030] In this embodiment, the dual sealing method of applying adhesive to the inner wall of the handle 6 and filling the gaps with adhesive can enhance the connection and sealing between the handle 6 and the outer tube 2, prevent external impurities from entering from the tail interface, and at the same time, the adhesiveness of the sealant can also improve the connection stability of the handle 6, preventing it from loosening during use.

[0031] In any of the above embodiments, preferably, the plug 7 is threadedly connected to the tail of the handle 6, and the center of the plug 7 has a channel for the cable 5 to pass through, and the inner wall of the channel is sealed with the cable 5 by sealant.

[0032] In this embodiment, the threaded plug 7 facilitates disassembly and maintenance in the later stage, and can enhance the sealing of the tail end through the threaded locking force. The sealant at the cable 5 channel achieves precise sealing of the cable 5 exiting part, forming a complete protection system at the tail end and eliminating leakage problems at the cable 5 interface.

[0033] In any of the above embodiments, preferably, the thermally conductive filler is thermally conductive magnesium powder; and / or the inner tube 1, the outer tube 2, the front end tube 3 and the plug 7 are all made of stainless steel; and / or the handle 6 is a polytetrafluoroethylene handle 6.

[0034] In this embodiment, the selection of thermally conductive magnesium powder ensures long-term stability of thermal conductivity. The stainless steel tube and plug 7 have excellent high-temperature resistance and corrosion resistance, making them suitable for complex industrial conditions. The polytetrafluoroethylene handle 6 combines insulation and high-temperature resistance, ensuring the safety of operators and preventing the handle 6 from deforming due to high temperatures, which would affect the sealing effect. The coordinated selection of materials for each component significantly improves the overall reliability and service life of the sensor.

[0035] The working principle of the centrally thermally enhanced temperature sensor packaging structure provided by this utility model can be divided into three core stages: heat conduction and temperature sensing, electrical signal transmission, and sealing protection. Each stage works together to achieve high-precision and high-stability temperature measurement, as detailed below: Heat conduction and temperature sensing stages When the sensor tip comes into contact with the measured medium, the heat of the measured medium is first transferred to the front tube 3. Since the front tube 3 is a thin-walled stainless steel hollow structure, the heat can quickly penetrate the tube wall and enter the front chamber 8 enclosed by the inner tube 1 and the front tube 3. The thermally conductive magnesium powder, which is pre-filled in the chamber and completely encloses the platinum resistance 4, will quickly receive the heat and, through its excellent thermal conductivity, conduct the heat evenly and without loss to the temperature sensing element of the platinum resistance 4. Compared with the traditional method of relying solely on the metal tube wall to conduct heat, the fully enclosed structure of the thermally conductive magnesium powder eliminates the thermal resistance caused by air gaps, significantly shortens the thermal response time, and avoids the problem of uneven local thermal conduction caused by direct contact between the platinum resistance 4 and the tube body. This allows the platinum resistance 4 to accurately sense the actual temperature of the measured medium and simultaneously generate a resistance value change that is linearly related to the temperature.

[0036] Electrical signal transmission stage The resistance signal generated by the temperature change of the platinum resistance thermometer 4 is transmitted through the cable 5 connected to it. The groove 11 in the inner tube 1 corresponding to the position where the cable 5 passes through is filled with sealant, which not only fixes the platinum resistance thermometer 4, the cable 5 and the inner tube 1, but also avoids signal fluctuations caused by loose components during signal transmission. The cable 5 passes through the internal channels of the inner tube 1, the outer tube 2 and the handle 6 in sequence, and finally passes through the cable 5 channel in the center of the plug 7 to the external temperature measurement display or control equipment. The external equipment can calculate the accurate temperature data of the measured medium by detecting the resistance change of the platinum resistance thermometer 4.

[0037] Sealing and protection phase The sealing structure of each part of the sensor provides a stable environment for overall temperature measurement: the sealant at the joint between the inner tube 1 and the outer tube 2 secures and seals the tubes, preventing external impurities from entering the tubes; the coaxial bonding structure between the front tube 3 and the front end of the outer tube 2 forms a front sealing barrier, isolating the measured medium or external moisture from entering the front chamber 8; the sealant on the inner wall of the handle 6 and the gap between it and the outer tube 2 enhances the sealing performance of the tail connection; the sealant at the threaded connection between the plug 7 and the handle 6 and at the cable 5 channel ensures a precise seal at the exit point of the cable 5. This end-to-end sealing structure ensures that the internal platinum resistance thermometer 4, cable 5, and other core components are in a dry and clean working environment, preventing external corrosion, leakage, and other factors from affecting component performance and ensuring the sensor's long-term stable output of temperature signals.

[0038] Overall, the structure achieves precise temperature measurement through an innovative design of thin-walled heat conduction at the front end and magnesium powder to enhance conduction, stabilizes the working environment through multi-part sealing, and ensures smooth signal transmission through coaxial nesting and threaded connection, ultimately achieving the goal of high-precision and high-reliability temperature measurement under complex working conditions.

[0039] In this utility model, the terms installation, connection, linking, and fixing should be interpreted broadly. For example, connection can be a fixed connection, a detachable connection, or an integral connection; linking can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In the description of this utility model, it should be understood that the terms "up," "down," "left," "right," "front," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In this specification, the terms "one embodiment," "some embodiments," "specific embodiments," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which 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.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A centrally thermally enhanced temperature sensor packaging structure, characterized in that, The device includes an inner tube (1), an outer tube (2), a front end tube (3), a platinum resistance thermometer (4), a cable (5), a handle (6), and a plug (7). The inner tube (1) is coaxially inserted inside the outer tube (2), and the tail of the inner tube (1) is flush with the tail of the outer tube (2). The platinum resistance thermometer (4) is fixed to the front end of the inner tube (1). The front end tube (3) is coaxially bonded to the front end of the outer tube (2) with sealant. The inner tube (1) has a slot (11) corresponding to the position where the cable (5) passes through. Sealant is injected into the slot (11) until the sealant fills the gap between the cable (5) and the inner tube (1) to achieve a fixed seal between the platinum resistance thermometer (4), the cable (5), and the inner tube (1). The handle (6) is coaxially inserted into the tail of the outer tube (2), and the plug (7) is detachably connected to the tail of the handle (6).

2. The centrally thermally enhanced temperature sensor packaging structure according to claim 1, characterized in that, A front end chamber (8) is formed inside the outer tube (2) by the inner tube (1) and the front end tube. The platinum resistance (4) is located inside the front end chamber (8) and is filled with a thermally conductive filler, which completely encloses the platinum resistance (4).

3. The centrally thermally enhanced temperature sensor packaging structure according to claim 1 or 2, characterized in that, The outer tube (2) has a diameter of 3mm-5mm and a wall thickness of 0.1mm-0.3mm. The length difference between the inner tube (1) and the outer tube (2) is 28mm-32mm. The outer side of the inner tube (1) at the joint of the inner tube (1) and the outer tube (2) is uniformly coated with sealant. The inner tube (1) and the outer tube (2) are fixed and sealed by the adhesiveness and clamping force of the sealant.

4. The center-heat-conductivity enhanced temperature sensor packaging structure according to claim 1 or 2, characterized in that, The front end tube (3) is a hollow structure, which is bonded to the front end face of the outer tube (2) by sealant, and the axis of the front end tube (3) is collinear with the axis of the outer tube (2) to form a front end sealing structure.

5. The centrally thermally enhanced temperature sensor packaging structure according to claim 4, characterized in that, The wall thickness of the front end tube (3) is less than the wall thickness of the outer tube (2).

6. The center-heat-conductivity enhanced temperature sensor packaging structure according to claim 1 or 2, characterized in that, The inner wall of the handle (6) is evenly coated with sealant. After the handle (6) is inserted into the tail of the outer tube (2), sealant is injected into the gap between the handle (6) and the outer tube (2) to achieve a sealed connection between the handle (6) and the outer tube (2).

7. The center-heat-conductivity enhanced temperature sensor packaging structure according to claim 1 or 2, characterized in that, The plug (7) is connected to the tail of the handle (6) by a thread. The center of the plug (7) has a channel for the cable (5) to pass through. The inner wall of the channel is sealed with the cable (5) by sealant.

8. The centrally thermally enhanced temperature sensor packaging structure according to claim 2, characterized in that, The thermally conductive filler is thermally conductive magnesium powder; and / or The inner tube (1), the outer tube (2), the front end tube (3), and the plug (7) are all made of stainless steel; and / or The handle (6) is a polytetrafluoroethylene handle (6).

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