A high-temperature resistant temperature sensor

Abstract

This utility model relates to the field of temperature sensor technology and discloses a high-temperature resistant temperature sensor, including a high-temperature resistant shell. A platinum-rhodium alloy thermocouple sensing element is precisely installed inside the high-temperature resistant shell. This element serves as the core temperature sensing component, utilizing the excellent high-temperature stability and thermoelectric potential characteristics of the platinum-rhodium alloy to achieve high-precision temperature sensing. This high-temperature resistant temperature sensor significantly improves high-temperature protection performance through the synergistic design of a double-layer composite high-temperature resistant shell and a nano-aerogel felt insulation layer. The outer silicon carbide ceramic layer can withstand temperatures above 1600℃ and chemical corrosion, while the inner stainless steel metal layer provides structural support. Combined with the extremely low thermal conductivity of the nano-aerogel felt {0.013W / (m·K)}, compared to traditional single-layer metal or ceramic shells, it can effectively reduce the internal operating temperature by more than 50%, avoiding direct damage to the element from high temperatures and extending the sensor's service life. It is suitable for extreme high-temperature environments such as metallurgical furnaces and ceramic kilns.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor technology, specifically a high-temperature resistant temperature sensor. Background Technology

[0002] In modern industrial fields, such as metallurgy, chemical engineering, and ceramic firing, accurate monitoring of temperature parameters is crucial for ensuring production quality and safe equipment operation in high-temperature processes.

[0003] Currently available high-temperature sensors have many limitations and cannot meet the application requirements of extreme high-temperature scenarios. First, in terms of housing protection, traditional sensors mostly use single-layer metal (such as stainless steel) or ceramic materials. Although single-layer metal housings have a certain thermal conductivity, they are prone to softening and deformation in high-temperature environments above 1000℃ and cannot resist the corrosion of strong corrosive gases. Single-layer ceramic housings, although heat-resistant, lack mechanical strength and are prone to cracking under high-temperature thermal stress, leading to the exposure and damage of internal components. Second, in existing heat insulation designs, some sensors only reduce the internal temperature by filling with traditional heat insulation materials such as asbestos. However, these materials have a high thermal conductivity (approximately 0.1-0.2 W / (m·K)) and limited heat insulation effect, making it difficult to control the internal temperature of the sensor within a safe threshold. This often results in component failure due to internal overheating. In addition, traditional sensors lack a balanced design between heat insulation and temperature measurement efficiency. Excessive heat insulation can lead to serious lag in temperature signal transmission, affecting the real-time performance of measurements. On the other hand, pursuing temperature measurement speed will sacrifice heat insulation performance and shorten the lifespan of the sensor. These defects have caused existing high-temperature resistant temperature sensors to frequently experience measurement inaccuracies and equipment failures in scenarios such as metallurgical furnaces and ceramic kilns, which seriously restricts the continuity and stability of high-temperature industrial production.

[0004] Therefore, we need to provide a high-efficiency, high-temperature resistant temperature sensor. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a high-temperature resistant temperature sensor to solve the problems mentioned in the background art, such as the poor high-temperature resistance of the single-material shell structure of the current high-temperature resistant temperature sensors on the market, and the lack of a balanced design between heat insulation and temperature measurement efficiency.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature resistant temperature sensor, including a high-temperature resistant housing, wherein a platinum-rhodium alloy thermocouple sensing element is precisely disposed inside the high-temperature resistant housing. This element serves as the core temperature measuring component, utilizing the excellent high-temperature stability and thermoelectric potential characteristics of the platinum-rhodium alloy to achieve high-precision temperature sensing.

[0009] The high-temperature resistant shell adopts a double-layer composite structure design, consisting of an outer silicon carbide ceramic layer and an inner stainless steel metal layer. The silicon carbide ceramic layer and the inner stainless steel metal layer are tightly bonded together with a high-performance high-temperature resistant adhesive to form a shell system that combines protection and structural strength. A nano-aerogel felt insulation layer is set inside the high-temperature resistant shell, which is located between the high-temperature resistant shell and the platinum-rhodium alloy thermocouple sensing element.

[0010] Furthermore, the nano-aerogel felt insulation layer has an extremely low thermal conductivity, which can effectively prevent external heat from being transferred to the platinum-rhodium alloy thermocouple sensing element, creating a relatively low-temperature working environment for the platinum-rhodium alloy thermocouple sensing element, and ensuring that the sensing element can accurately obtain external temperature signals.

[0011] Furthermore, multiple metal heat-conducting rods are vertically extended from the outer surface of the platinum-rhodium alloy thermocouple sensing element. The metal heat-conducting rods are made of alloy material with high thermal conductivity. The end of the metal heat-conducting rod away from the sensing element passes through the nano-aerogel felt insulation layer and is tightly connected to the inner stainless steel metal layer of the high-temperature resistant shell, forming a local efficient heat conduction channel, which ensures rapid transmission of temperature signals while providing heat insulation.

[0012] Furthermore, the high-temperature resistant housing also integrates a signal processing module, which includes a signal amplification circuit, a filtering circuit, and an A / D conversion circuit. The signal amplification circuit is used to amplify the weak thermoelectric potential signal output by the temperature sensing element.

[0013] Furthermore, the filtering circuit is used to remove interference noise from the signal, and the A / D conversion circuit converts the analog signal into a digital signal to facilitate subsequent data transmission and processing. The signal processing module uses high-temperature resistant electronic components and is processed through a special packaging process to ensure long-term stable operation in high-temperature environments.

[0014] Furthermore, the signal processing module is electrically connected to the platinum-rhodium alloy thermocouple sensing element via a fluoroplastic insulated wire. The fluoroplastic insulated wire, with its excellent high-temperature resistance and insulation properties, ensures the stability and reliability of signal transmission and prevents short circuits or signal attenuation in high-temperature environments.

[0015] Furthermore, the outer surface of the high-temperature resistant shell is uniformly distributed with heat dissipation fins, which are made of copper alloy material with high thermal conductivity and are precision machined into a radial structure, greatly increasing the heat dissipation surface area.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This high-temperature resistant temperature sensor significantly improves high-temperature protection performance through the synergistic design of a high-temperature resistant shell with a double-layer composite structure and a nano-aerogel felt insulation layer. The outer silicon carbide ceramic layer can withstand temperatures above 1600℃ and chemical corrosion, while the inner stainless steel metal layer provides structural support. Combined with the extremely low thermal conductivity of the nano-aerogel felt {0.013W / (m·K)}, compared with traditional single-layer metal or ceramic shells, it can effectively reduce the internal working temperature by more than 50%, avoid direct damage to components from high temperatures, and extend the service life of the sensor. It is suitable for extreme high-temperature scenarios such as metallurgical furnaces and ceramic kilns.

[0018] 2. This high-temperature resistant temperature sensor achieves an efficient balance between heat insulation and temperature measurement through an innovative connection between a metal heat-conducting rod and a platinum-rhodium alloy thermocouple sensing element. The metal heat-conducting rod, made of a high thermal conductivity alloy, penetrates the insulation layer to form a local heat conduction channel. While blocking ambient heat, it ensures that the temperature signal transmission delay is reduced by more than 70%. Compared with the temperature measurement lag problem caused by thermal resistance in conventional insulation designs, it can sense changes in external temperature more quickly and accurately, improve measurement response speed and accuracy, and meet the real-time monitoring needs of high-temperature processes.

[0019] 3. This high-temperature resistant temperature sensor, through the combination of a high-temperature resistant signal processing module and fluoroplastic insulated wire, ensures stable signal transmission in high-temperature environments. The signal processing module, which uses high-temperature resistant electronic components and a special packaging process, can operate stably continuously in an environment of 200℃. The fluoroplastic insulated wire has a temperature resistance of over 200℃ and excellent insulation performance. Compared with the defects of ordinary wires that are prone to aging and short circuits at high temperatures, it effectively avoids signal attenuation and transmission failure, ensuring complete and reliable measurement data and providing accurate temperature feedback for industrial automation control. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the high-temperature resistant shell of this utility model;

[0022] Figure 3 This is a schematic diagram of the signal processing module framework structure of this utility model;

[0023] Figure 4This is a magnified schematic diagram showing a partial detail of the platinum-rhodium alloy thermocouple sensing element of this utility model.

[0024] In the diagram: 1. High-temperature resistant shell; 2. Platinum-rhodium alloy thermocouple sensing element; 3. Silicon carbide ceramic layer; 4. Stainless steel metal layer; 5. Nano-aerogel felt insulation layer; 6. Metal heat-conducting rod; 7. Signal processing module; 8. Signal amplification circuit; 9. Filtering circuit; 10. A / D conversion circuit; 11. Fluoroplastic insulated wire; 12. Heat sink fins. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a high-temperature resistant temperature sensor, including a high-temperature resistant shell 1, and a platinum-rhodium alloy thermocouple sensing element 2 is precisely installed inside the high-temperature resistant shell 1. This element serves as the core temperature measuring component, utilizing the excellent high-temperature stability and thermoelectric potential characteristics of the platinum-rhodium alloy to achieve high-precision temperature sensing.

[0027] The high-temperature resistant shell 1 adopts a double-layer composite structure design, consisting of an outer silicon carbide ceramic layer 3 and an inner stainless steel metal layer 4. The silicon carbide ceramic layer 3 and the inner stainless steel metal layer 4 are tightly bonded together with a high-performance high-temperature resistant adhesive to form a shell system that combines protection and structural strength. A nano-aerogel felt insulation layer 5 is installed inside the high-temperature resistant shell 1, located between the high-temperature resistant shell 1 and the platinum-rhodium alloy thermocouple sensing element 2. The nano-aerogel felt insulation layer 5 has an extremely low thermal conductivity, effectively preventing external heat from reaching the platinum-rhodium alloy thermocouple. The sensing element 2 transmits heat and creates a relatively low-temperature working environment for the platinum-rhodium alloy thermocouple sensing element 2. To ensure that the sensing element can accurately acquire the external temperature signal, multiple metal heat-conducting rods 6 are vertically extended on the outer surface of the platinum-rhodium alloy thermocouple sensing element 2. The metal heat-conducting rods 6 are made of alloy material with high thermal conductivity. The end of the metal heat-conducting rod 6 away from the sensing element passes through the nano-aerogel felt insulation layer 5 and is tightly connected to the inner stainless steel metal layer 4 of the high-temperature resistant shell 1 to form a local efficient heat conduction channel, which ensures rapid transmission of temperature signal while providing heat insulation.

[0028] When the high-temperature resistant temperature sensor is in a high-temperature working environment, its workflow can be divided into four core stages: temperature sensing, heat conduction, signal processing, and heat dissipation. In the temperature sensing stage, the core component, the platinum-rhodium alloy thermocouple sensing element 2, utilizes the Seebeck effect of the platinum-rhodium alloy material to directly contact the external high-temperature medium. When the external temperature changes, a thermoelectric potential signal proportional to the temperature is generated at both ends of the sensing element. The minute changes in this signal accurately reflect the fluctuations in the ambient temperature. During the heat conduction process, the double-layer composite structure of the high-temperature resistant shell 1 works in conjunction with the metal heat-conducting rod 6, and the outer silicon carbide ceramic layer 3 directly... Withstanding external temperatures above 1600℃, the inner stainless steel metal layer 4 absorbs and conducts some heat thanks to its high hardness and chemical stability. Meanwhile, the nano-aerogel felt insulation layer 5 blocks most of the heat from being transferred to the interior. To ensure that the sensing element can obtain temperature signals in a timely manner, the metal heat-conducting rod 6 is made of a high thermal conductivity alloy material. One end is tightly connected to the platinum-rhodium alloy thermocouple sensing element 2, and the other end penetrates the nano-aerogel felt insulation layer 5 and is connected to the stainless steel metal layer 4, forming an efficient heat conduction channel. This allows the sensing element to respond quickly to changes in external temperature and avoids temperature measurement lag due to excessive insulation.

[0029] The high-temperature resistant housing 1 also integrates a signal processing module 7, which includes a signal amplification circuit 8, a filtering circuit 9, and an A / D conversion circuit 10. The signal amplification circuit 8 amplifies the weak thermoelectric potential signal output by the temperature sensing element, the filtering circuit 9 removes interference noise from the signal, and the A / D conversion circuit 10 converts the analog signal into a digital signal for subsequent data transmission and processing. The signal processing module 7 uses high-temperature resistant electronic components and is processed with special packaging technology to ensure long-term stable operation in high-temperature environments. The signal processing module 7 is electrically connected to the platinum-rhodium alloy thermocouple sensing element 2 through a fluoroplastic insulated wire 11. The fluoroplastic insulated wire 11, with its excellent high-temperature resistance and insulation properties, ensures the stability and reliability of signal transmission and prevents short circuits or signal attenuation in high-temperature environments. The outer surface of the high-temperature resistant housing 1 is uniformly distributed with heat dissipation fins 12, which are made of copper alloy material with high thermal conductivity and are precision-machined into a radial structure, greatly increasing the heat dissipation surface area.

[0030] In the signal processing stage, the weak thermoelectric potential signal generated by the platinum-rhodium alloy thermocouple sensing element 2 is transmitted to the signal processing module 7 via the fluoroplastic insulated wire 11. First, the signal amplification circuit 8 amplifies the microvolt-level thermoelectric potential signal through multiple stages. Then, the filtering circuit 9 removes electromagnetic interference, thermal noise, and other noise from the high-temperature environment using algorithms such as bandpass filtering. Finally, the A / D conversion circuit 10 converts the analog signal into a digital signal, facilitating subsequent high-precision data transmission and analysis. Because the signal processing module 7 uses high-temperature resistant electronic components and special packaging technology, it can ensure the stability and accuracy of signal processing even in high-temperature environments. The heat dissipation mechanism... On the outer surface of the high-temperature resistant housing 1, radial copper alloy heat dissipation fins 12 increase the heat dissipation area and dissipate the heat absorbed by the housing to the surrounding environment through thermal radiation and natural convection. When the ambient temperature is high and the natural heat dissipation efficiency is insufficient, the forced convection between the heat dissipation fins 12 and the air, such as with the assistance of an external fan, can further accelerate heat dissipation and maintain the overall temperature of the sensor within a safe range. At the same time, the nano-aerogel felt insulation layer 5 reduces the accumulation of internal heat and ensures that the platinum-rhodium alloy thermocouple sensing element 2 and the signal processing module 7 work stably in a relatively low-temperature environment, enabling the sensor to continuously and accurately measure temperature and transmit signals in extreme high-temperature scenarios.

[0031] Working Principle: When this high-temperature resistant temperature sensor is in a high-temperature working environment, its workflow can be divided into four core stages: temperature sensing, heat conduction, signal processing, and heat dissipation. In the temperature sensing stage, the core component, the platinum-rhodium alloy thermocouple sensing element 2, utilizes the Seebeck effect of the platinum-rhodium alloy material to directly contact the external high-temperature medium. When the external temperature changes, a thermoelectric potential signal proportional to the temperature is generated at both ends of the sensing element. The minute change in this signal accurately reflects the fluctuation of the ambient temperature. During the heat conduction process, the double-layer composite structure of the high-temperature resistant shell 1 works in conjunction with the metal heat-conducting rod 6, and the outer silicon carbide ceramic layer 3 directly withstands the external heat. Exceeding 1600℃, it resists thermal shock and corrosion due to its high hardness and chemical stability. The inner stainless steel metal layer 4 receives and conducts some heat, while the nano-aerogel felt insulation layer 5 blocks most of the heat transfer to the interior. To ensure that the sensing element can obtain temperature signals in a timely manner, the metal heat-conducting rod 6 is made of a high thermal conductivity alloy material. One end is tightly connected to the platinum-rhodium alloy thermocouple sensing element 2, and the other end penetrates the nano-aerogel felt insulation layer 5 and connects to the stainless steel metal layer 4, forming an efficient heat conduction channel. This allows the sensing element to respond quickly to changes in external temperature and avoids temperature measurement lag due to excessive insulation. In the signal processing stage, the platinum-rhodium alloy... The weak thermoelectric potential signal generated by the thermocouple sensing element 2 is transmitted to the signal processing module 7 via the fluoroplastic insulated wire 11. First, the signal amplification circuit 8 amplifies the microvolt-level thermoelectric potential signal through multiple stages. Then, the filtering circuit 9 removes electromagnetic interference, thermal noise, and other noise from the high-temperature environment using algorithms such as bandpass filtering. Finally, the A / D conversion circuit 10 converts the analog signal into a digital signal, facilitating subsequent high-precision data transmission and analysis. Because the signal processing module 7 uses high-temperature resistant electronic components and special packaging technology, it can ensure the stability and accuracy of signal processing even in high-temperature environments. Regarding the heat dissipation mechanism, the high-temperature resistant outer... The radial copper alloy heat dissipation fins 12 on the outer surface of the shell 1 increase the heat dissipation area and dissipate the heat absorbed by the shell to the surrounding environment through thermal radiation and natural convection. When the ambient temperature is high and the natural heat dissipation efficiency is insufficient, the forced convection between the heat dissipation fins 12 and the air, such as with the assistance of an external fan, can further accelerate the heat dissipation and maintain the overall temperature of the sensor within a safe range. At the same time, the nano-aerogel felt insulation layer 5 reduces the accumulation of internal heat and ensures that the platinum-rhodium alloy thermocouple sensing element 2 and the signal processing module 7 work stably in a relatively low temperature environment, enabling the sensor to continuously and accurately measure the temperature and transmit signals in extreme high temperature scenarios.

[0032] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A high temperature resistant temperature sensor comprising a high temperature resistant housing (1), characterized in that: The high-temperature resistant shell (1) is equipped with a platinum-rhodium alloy thermocouple sensing element (2). The high-temperature resistant shell (1) adopts a double-layer composite structure, consisting of an outer silicon carbide ceramic layer (3) and an inner stainless steel metal layer (4). The silicon carbide ceramic layer (3) and the inner stainless steel metal layer (4) are bonded together by a high-temperature resistant adhesive. A nano-aerogel felt insulation layer (5) is provided inside the high-temperature resistant shell (1). The nano-aerogel felt insulation layer (5) is located between the high-temperature resistant shell (1) and the platinum-rhodium alloy thermocouple sensing element (2).

2. The high temperature resistant temperature sensor of claim 1, wherein: Multiple metal heat-conducting rods (6) are vertically extended on the outer surface of the platinum-rhodium alloy thermocouple sensing element (2). The metal heat-conducting rods (6) are made of alloy material. The end of the metal heat-conducting rod (6) away from the sensing element passes through the nano-aerogel felt insulation layer (5) and is connected to the inner stainless steel metal layer (4) of the high-temperature resistant shell (1) to form a local heat conduction channel.

3. The high temperature resistant temperature sensor of claim 1, wherein: The high-temperature resistant housing (1) also integrates a signal processing module (7), which includes a signal amplification circuit (8), a filter circuit (9) and an A / D conversion circuit (10). The signal amplification circuit (8) is used to amplify the thermoelectric potential signal output by the temperature sensing element.

4. The high temperature resistant temperature sensor of claim 3, wherein: The filtering circuit (9) is used to remove interference noise from the signal, the A / D conversion circuit (10) converts the analog signal into a digital signal, and the signal processing module (7) uses high-temperature resistant electronic components and is processed by packaging technology.

5. A high temperature resistant temperature sensor according to claim 4, wherein: The signal processing module (7) is electrically connected to the platinum-rhodium alloy thermocouple sensing element (2) via a fluoroplastic insulated wire (11).

6. The high temperature resistant temperature sensor of claim 1, wherein: The outer surface of the high-temperature resistant shell (1) is uniformly distributed with heat dissipation fins (12). The heat dissipation fins (12) are made of copper alloy material and have a radial structure to increase the heat dissipation surface.

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