Test temperature sensor

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to a test temperature sensor. Comprising a shell, a PTC thermistor and a signal processing circuit board, a containing space is formed in the shell, and the PTC thermistor is installed in the containing space. The surface of the housing is provided with a heat-insulating structure. And the signal processing circuit board is connected in the shell. The signal processing circuit board is integrated with an amplification module, a filtering module and an analog-to-digital conversion module. According to the test temperature sensor, the high-precision PTC thermistor is combined with the optimized signal processing circuit board, so that the temperature measurement precision can be within + / -0.1 DEG C and is higher than that of most traditional temperature sensors, the response time is short, the environment temperature change is reflected in time, and the test accuracy is improved. The excellent protection performance of the housing and the heat insulation structure ensures the long-term stable operation of the sensor in a complex environment, and improves the environmental anti-interference performance and the use convenience.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to a test temperature sensor. Background Technology

[0002] Accurate temperature measurement is crucial in many scenarios, including industrial production and daily life. Traditional temperature sensors often have limitations, such as susceptibility to environmental interference, slow response times, and insufficient stability. In some industrial processes with stringent temperature control requirements, such as chemical reactions and electronic chip manufacturing, inaccurate temperature measurements can lead to decreased product quality, reduced production efficiency, and even safety accidents. Furthermore, in everyday smart home systems, sensors used to monitor indoor temperature that are inaccurate or slow to respond cannot provide users with a comfortable living experience and fail to meet the growing demand for precise temperature monitoring. Utility Model Content

[0003] The purpose of this invention is to provide a test temperature sensor, which aims to solve the technical problems in the prior art, such as measurement accuracy being easily affected by environmental interference, low measurement accuracy, slow response speed, sluggish reaction, and insufficient stability.

[0004] To achieve the above objectives, the test temperature sensor provided in this embodiment of the utility model includes a housing made of a high-temperature resistant and corrosion-resistant insulating material, an internal accommodating space formed inside the housing, and a PTC thermistor installed in the accommodating space; the surface of the housing is provided with a heat insulation structure.

[0005] The PTC thermistor is made of thermistor material. The PTC thermistor can quickly and accurately sense changes in the external temperature and convert the temperature signal into an electrical signal output.

[0006] It also includes a signal processing circuit board connected inside the housing. The signal processing circuit board integrates an amplification module, a filtering module, and an analog-to-digital conversion module. The signal processing circuit board is electrically connected to the PTC thermistor and is used to receive the weak electrical signal output by the PTC thermistor. The amplification module and the filtering module process the signal to remove noise interference, and the analog signal is converted into a digital signal output by the analog-to-digital conversion module, thereby improving the anti-interference capability and adaptability of signal transmission.

[0007] It also includes a connection interface, which is connected to one end of the housing and is connected to an external controller and display to enable fast data transmission and interaction.

[0008] As an optional solution of this utility model, the heat insulation structure of the outer shell is a double-layer hollow structure, with a heat insulation sheet filling the middle of the heat insulation structure. The heat insulation sheet is fixedly connected to the surface of the outer shell and uses a heat insulation material with low thermal conductivity.

[0009] As an optional solution of this utility model, a thermally conductive silicone layer is provided between the PTC thermistor and the inner wall of the housing's accommodating space, and the thermally conductive silicone layer is fixedly connected to the inner wall of the housing.

[0010] As an optional solution of this utility model, the amplification module of the signal processing circuit board adopts a low-noise, high-gain amplifier chip, the filtering module is a multi-stage active filter circuit, and the analog-to-digital conversion module converts the weak electrical signal output by the PTC thermistor into a digital signal.

[0011] As an optional solution of this utility model, a dust cover is provided on the outside of the connection interface, the dust cover is fixedly connected to the outside of the connection interface, and the dust cover is made of silicone.

[0012] As an optional solution of this utility model, the bottom of the outer shell is provided with a threaded connection part, which is fixedly connected to the outer shell.

[0013] As an optional embodiment of this invention, the temperature coefficient of the PTC thermistor is 2% / ℃-6% / ℃.

[0014] The above-mentioned technical solutions of one or more technical solutions in the test temperature sensor provided in this embodiment of the utility model have at least one of the following technical effects:

[0015] The test temperature sensor provided in this application, with its high-precision PTC thermistor and optimized signal processing circuit board, enables temperature measurement accuracy to reach within ±0.1℃, which is higher than most traditional temperature sensors. Its fast response time allows it to update temperature data within seconds, promptly reflecting changes in ambient temperature. The excellent protective performance of the housing and thermal insulation structure ensures the long-term stable operation of the sensor in complex environments, improving environmental anti-interference and ease of use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.

[0017] Figure 1 A perspective view of the test temperature sensor provided in an embodiment of this utility model.

[0018] Figure 2 A side view of the test temperature sensor provided in an embodiment of this utility model.

[0019] Figure 3 for Figure 2 Sectional view along the middle AA.

[0020] The following are the labeling elements in the figure:

[0021] 1. Housing; 2. PTC thermistor; 3. Signal processing circuit board; 4. Connection interface; 5. Heat insulation sheet; 6. Thermal conductive silicone layer;

[0022] 11. Threaded connection part;

[0023] 41. Dust cover. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0025] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0028] In one embodiment of this utility model, such as Figures 1-3 As shown, a test temperature sensor is provided, including a housing 1 made of a high-temperature resistant and corrosion-resistant insulating material. An internal cavity is formed within the housing 1, and a PTC thermistor 2 is installed within the cavity. A heat-insulating structure is provided on the surface of the housing 1.

[0029] The PTC thermistor 2 is made of thermistor material. The PTC thermistor 2 can quickly and accurately sense changes in the external temperature and convert the temperature signal into an electrical signal output.

[0030] It also includes a signal processing circuit board 3, which is connected inside the housing 1. The signal processing circuit board 3 integrates an amplification module, a filtering module, and an analog-to-digital conversion module. The signal processing circuit board 3 is electrically connected to the PTC thermistor 2 and is used to receive the weak electrical signal output by the PTC thermistor 2. After processing by the amplification module and the filtering module to remove noise interference, the analog signal is converted into a digital signal output by the analog-to-digital conversion module, thereby improving the anti-interference capability and adaptability of signal transmission.

[0031] It also includes a connection interface 4, which is connected to one end of the housing 1. The connection interface 4 is connected to an external controller and a display to enable fast data transmission and interaction.

[0032] The test temperature sensor provided in this application, with its high-precision PTC thermistor 2 combined with an optimized signal processing circuit board 3, enables temperature measurement accuracy to reach within ±0.1℃, which is higher than most traditional temperature sensors. Its fast response time allows it to update temperature data within seconds, promptly reflecting changes in ambient temperature. The excellent protective performance of the housing 1 and the heat insulation structure ensures the long-term stable operation of the sensor in complex environments, improving environmental anti-interference and ease of use.

[0033] Temperature sensing principle:

[0034] The core sensing component of the temperature sensor in this experiment is a PTC thermistor 2, which is made of a special thermistor material, such as barium titanate (BaTiO3)-based ceramic. This thermistor material has a positive temperature coefficient, meaning that as the ambient temperature rises, the physical properties of the material, such as the carrier mobility, change, leading to an increase in resistance. Conversely, the resistance decreases as the temperature decreases. Based on this characteristic, the PTC thermistor 2 can sensitively sense subtle changes in the ambient temperature and convert them into corresponding changes in electrical signals. For example, when the ambient temperature rises from 20°C to 21°C, the resistance of the PTC thermistor 2 will increase according to its specific temperature coefficient, thereby causing a change in the current passing through it or the voltage across its terminals, which serves as an electrical signal characterizing the temperature change.

[0035] Signal processing principles:

[0036] The signal processing circuit board 3, electrically connected to the PTC thermistor 2, plays a crucial role in signal optimization. When the PTC thermistor 2 outputs a weak and noisy electrical signal, the amplification module on the signal processing circuit board 3 intervenes first. This amplification module uses a low-noise, high-gain amplifier chip, which can linearly amplify the weak electrical signal, increasing its strength to an amplitude range that subsequent circuits can effectively process. For example, if the original electrical signal voltage amplitude is only at the millivolt level, it can be increased to the volt level after processing by the amplification module. Next, the filtering module filters out noise from the amplified signal. The filtering module is usually designed as a multi-stage active filter circuit, which can accurately identify and block stray signals from external electromagnetic interference, line noise, etc., allowing only effective frequency signals related to temperature changes to pass through. For example, the filtering module can effectively block 50Hz or 60Hz power frequency interference and high-frequency electromagnetic radiation noise commonly found in industrial environments. Finally, the amplified and filtered analog signal enters the analog-to-digital conversion module. This module has high-precision conversion performance, converting the continuously changing analog signal into a discrete digital signal based on a specific sampling frequency and quantization accuracy. These digital signals exist in binary code form, which can be directly recognized and processed by external digital devices such as controllers and displays, greatly improving the anti-interference ability and adaptability of signal transmission and ensuring the accurate transmission of temperature data.

[0037] In another embodiment of this utility model, the heat insulation structure of the outer shell 1 is a double-layer hollow structure, with a heat insulation sheet 5 filling the middle of the heat insulation structure. The heat insulation sheet 5 is fixedly connected to the surface of the outer shell 1 and uses a heat insulation material with low thermal conductivity, such as rock wool.

[0038] In another embodiment of this invention, a thermally conductive silicone layer 6 is provided between the PTC thermistor 2 and the inner wall of the housing 1's accommodating space, and the thermally conductive silicone layer 6 is fixedly connected to the inner wall of the housing 1. The thermally conductive silicone layer 6 ensures that the sensitive element can sense the external temperature in a timely and accurate manner, while also serving to buffer and fix the sensitive element.

[0039] In another embodiment of this utility model, the amplification module of the signal processing circuit board 3 adopts a low-noise, high-gain amplifier chip, the filtering module is a multi-stage active filter circuit, and the analog-to-digital conversion module converts the weak electrical signal output by the PTC thermistor 2 into a digital signal. The amplifier chip converts the weak electrical signal output by the PTC thermistor 2 into a voltage signal through a differential amplifier circuit and performs preliminary amplification. Then, the signal amplitude is further amplified by intermediate stage components such as common-source field-effect transistors, thereby enhancing the weak electrical signal to the level required for subsequent processing, and minimizing the introduction of new noise during the amplification process.

[0040] In another embodiment of this utility model, a dust cover 41 is provided on the outside of the connection interface 4. The dust cover 41 is fixedly connected to the outside of the connection interface 4, and the material of the dust cover 41 is silicone. The silicone dust cover 41 utilizes its own tight structural characteristics to block dust and impurities. Silicone has good flexibility and resilience, and its molecular structure is relatively tight. The tiny pore size is much smaller than the diameter of dust particles, making it difficult for dust particles floating in the outside air to penetrate the dust cover 41 and enter the interior of the connection interface 4. When dust particles collide with the surface of the dust cover 41, the soft texture of silicone can buffer the impact of the particles, preventing dust from embedding or breaking through the protective layer due to collision, thereby providing a reliable dust barrier for the connection interface 4.

[0041] In another embodiment of this utility model, a threaded connection portion 11 is provided at the bottom of the outer casing 1, and the threaded connection portion 11 is fixedly connected to the outer casing 1. The threaded connection method provides great convenience for the installation and removal of the temperature sensor.

[0042] In another embodiment of this invention, the temperature coefficient of the PTC thermistor 2 is 2% / ℃-6% / ℃. The PTC thermistor 2 is made of a thermistor material with a special crystal structure, such as doped and modified barium titanate-based ceramic material. In the microstructure of this material, the carrier migration characteristics within the crystal lattice change with increasing temperature. When the temperature is within the normal operating range, for every 1℃ increase in temperature, the thermal vibration of atoms within the material intensifies, increasing the resistance to carrier migration and causing the resistance value to increase proportionally; this proportion is the temperature coefficient. Its temperature coefficient is in the range of 2% / ℃-6% / ℃, meaning that for every 1℃ increase in temperature, the resistance value increases by 2%-6% relative to its original value. This characteristic allows the PTC thermistor 2 to sensitively sense subtle changes in ambient temperature and convert them into significant changes in resistance, thereby generating corresponding electrical signal changes for temperature monitoring.

[0043] The test temperature sensor provided in this application, with its high-precision PTC thermistor 2 combined with an optimized signal processing circuit board 3, enables temperature measurement accuracy to reach within ±0.1℃, which is higher than most traditional temperature sensors. Its fast response time allows it to update temperature data within seconds, promptly reflecting changes in ambient temperature. The excellent protective performance of the housing 1 and the heat insulation structure ensures the long-term stable operation of the sensor in complex environments, improving environmental anti-interference and ease of use.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A test temperature sensor, characterized in that, Includes an outer casing made of a high-temperature resistant and corrosion-resistant insulating material, with an internal receiving space containing a PTC thermistor; the outer casing surface is provided with a heat-insulating structure. The PTC thermistor is made of thermistor material. The PTC thermistor can quickly and accurately sense changes in the external temperature and convert the temperature signal into an electrical signal output. It also includes a signal processing circuit board connected inside the housing. The signal processing circuit board integrates an amplification module, a filtering module, and an analog-to-digital conversion module. The signal processing circuit board is electrically connected to the PTC thermistor and is used to receive the weak electrical signal output by the PTC thermistor. The amplification module and the filtering module process the signal to remove noise interference, and the analog signal is converted into a digital signal output by the analog-to-digital conversion module, thereby improving the anti-interference capability and adaptability of signal transmission. It also includes a connection interface, which is connected to one end of the housing and is connected to an external controller and display to enable fast data transmission and interaction.

2. The test temperature sensor according to claim 1, characterized in that, The heat insulation structure of the outer shell is a double-layer hollow structure, with a heat insulation sheet filling the middle of the heat insulation structure. The heat insulation sheet is fixedly connected to the surface of the outer shell and uses a heat insulation material with low thermal conductivity.

3. The test temperature sensor according to claim 1, characterized in that, A thermally conductive silicone layer is provided between the PTC thermistor and the inner wall of the housing, and the thermally conductive silicone layer is fixedly connected to the inner wall of the housing.

4. The test temperature sensor according to claim 1, characterized in that, The signal processing circuit board's amplification module uses a low-noise, high-gain amplifier chip, the filtering module is a multi-stage active filter circuit, and the analog-to-digital conversion module converts the weak electrical signal output by the PTC thermistor into a digital signal.

5. The test temperature sensor according to claim 1, characterized in that, The connection interface is provided with a dust cover, which is fixedly connected to the outside of the connection interface. The dust cover is made of silicone.

6. A test temperature sensor according to claim 1, characterized in that, The bottom of the outer casing is provided with a threaded connection part, which is fixedly connected to the outer casing.

7. A test temperature sensor according to claim 1, characterized in that, The temperature coefficient of the PTC thermistor is 2% / ℃-6% / ℃.

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