Temperature sensor

Abstract

The utility model relates to a temperature sensor and a sensor assembly connected with an elastic structure assembly. The elastic structure assembly comprises a pressure spring, and the sensor assembly comprises a pressure spring fixing piece welded to one end of the pressure spring, a protective sleeve made of a heat conduction material and welded to the pressure spring fixing piece, and a temperature measuring assembly placed in the protective sleeve. The sensor assembly forms a whole by filling a heat-conducting insulating material between the protective sleeve and the temperature measuring assembly, and is tightly attached to a measured object through the elastic force of the pressure spring. According to the utility model, the temperature measurement accuracy of the temperature sensor can be obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measurement, in particular to a temperature sensor. Background Technique

[0002] The sensor technology really began to develop in the mid-20th century. At that time, the development of sensor technology lagged behind that of computer technology and numerical control technology. Many advanced achievements still remained in the experimental research stage and were not put into actual production and wide application, with a low conversion rate. With the rapid development of related information industries such as the machinery industry, electronics, computers, and automation, the development of sensor research and its related technology industries has become increasingly important. Experts from various countries are competing to develop various special and practical measurement technologies to improve the heat conduction performance of temperature sensors in order to achieve the purpose of accurate temperature measurement.

[0003] Currently, the conventional process manufacturing method of temperature sensors in the market is: between the temperature measurement element of the sensor and the protection tube, the gap between the temperature measurement element and the metal protection tube is isolated by insulating porcelain beads for insulation treatment. This method only solves the internal insulation problem of the sensor, but has no significant effect on improving the heat conduction between the temperature sensor and the measured medium and improving the temperature measurement accuracy of the temperature sensor. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a temperature sensor that can significantly improve the temperature measurement accuracy.

[0005] The technical solution adopted by the utility model to solve its technical problem is: to provide a temperature sensor and a sensor assembly connected to the elastic structure assembly; the elastic structure assembly includes a compression spring, and the sensor assembly includes a compression spring fixing part welded to one end of the compression spring, a protective sleeve made of a heat-conducting material and welded to the compression spring fixing part, and a temperature measurement assembly placed in the protective sleeve. The sensor assembly forms an integral body by filling a heat-conducting insulating material between the protective sleeve and the temperature measurement assembly, and closely adheres to the measured object through the elastic force of the compression spring.

[0006] Further, the heat-conducting insulating material is filled by the method of pressurization + vibration.

[0007] Further, the heat-conducting insulating material is Al2O3 material.

[0008] Further, the density of the Al2O3 material is 3.9 - 4.0 g / cm 3 .

[0009] Further, the end of the protective sleeve is a convex-shaped heat-conducting block.

[0010] Further, the heat conduction coefficient of the heat conduction block is 429 w / mk.

[0011] Further, the elastic structure assembly further includes a wiring device, and the wiring device is welded to the other end of the compression spring.

[0012] Further, the compression spring is made of stainless steel wire with a diameter of φ1.2 to φ1.6, the spring pitch ratio of the compression spring is 9 to 11, and the compression ratio of the compression spring is 20% to 22%.

[0013] Beneficial effects

[0014] Due to the adoption of the above technical solutions, compared with the prior art, the present utility model has the following advantages and positive effects: by adding a compression spring structure member in the sensor, adding a heat conduction block at the end of the protective sleeve, and applying pressurization + vibration inside the sensor to fully fill the Al2O3 material with a density of 3.9 - 4.0 g / cm 3 it can accelerate the heat conduction between the temperature sensor and the object to be measured, improve the insulation strength, and thus significantly improve the temperature measurement accuracy function of the temperature sensor. Description of the drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the sensor assembly of an embodiment of the present utility model;

[0017] Figure 3 is a schematic working principle diagram of an embodiment of the present utility model;

[0018] Figure 4 is a schematic working principle diagram of the sensor assembly of an embodiment of the present utility model. Specific embodiments

[0019] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0020] The embodiment of the present utility model relates to a precise temperature measurement sensor, such as Figure 1 and Figure 2As shown in the figure, it includes a sensor component and an elastic structure component. The sensor component consists of a temperature measurement component (including a three-wire temperature measurement element 1 and a wire 7), a protective sleeve 2, and a spring fixing part 4. The end of the protective sleeve 2 is a heat conduction block 3 with excellent heat conduction coefficient. The inside of the sensor component is fully filled with Al2O3 material and welded to the spring fixing part 4 to form an integral body. The elastic structure component consists of a compression spring 5 and a wiring device 6.

[0021] To ensure the effect of accurate temperature measurement, the end of the protective sleeve 2 uses a heat conduction block 3 with a heat conduction coefficient of 429 w / mk, and the shape of the heat conduction block 3 is a convex structure. The inside of the sensor component is filled with Al2O3 material by applying pressure + vibration. The density of the Al2O3 material is 3.9 - 4.0 g / cm 3 . The elastic structure component is made of a compression spring 5 formed by 316L stainless steel wire with a diameter of φ1.2 - φ1.6. The spring pitch ratio of the compression spring is 9 - 11, and the compression ratio of the compression spring is 20% - 22%. It is spot welded to the wiring device 6.

[0022] As Figure 3 and Figure 4 shown, when using the above-mentioned precise temperature sensor, first install the temperature measurement component into the protective sleeve 2. When the inside of the protective sleeve 2 is filled with Al2O3 material by applying pressure + vibration, the heat conduction and insulation strength between the temperature sensor and the object to be measured are significantly improved. The spring fixing structure 4 presses the sensor component tightly against the object to be measured through the elastic force of the elastic structure component, further ensuring the temperature measurement accuracy of the temperature sensor.

[0023] In some embodiments, the temperature measurement element can be a temperature measurement element with a three-wire or four-wire connection method. The protective sleeve can be made of a metal material. The spring fixing part and the temperature sensor are welded into an integral body by high-frequency welding.

[0024] It is measured through experiments that when using the sensor with the above parameters for experiments, its temperature measurement effect has a higher insulation strength (easier to reach infinity) and faster heat conduction (the heat response time is 3.5 times faster) than the temperature sensors produced conventionally. It can be seen that adopting this structure and process can effectively accelerate the heat conduction and insulation strength between the temperature sensor and the object to be measured, and can significantly improve the temperature measurement accuracy of the temperature sensor.

Claims

1. A temperature sensor, characterized in that, It includes an elastic structure component and a sensor component connected to the elastic structure component; the elastic structure component includes a compression spring, and the sensor component includes a compression spring fixing member welded to one end of the compression spring, a protective sleeve made of a heat-conducting material and welded to the compression spring fixing member, and a temperature measuring component placed in the protective sleeve. The sensor component forms an integral body by filling a heat-conducting insulating material between the protective sleeve and the temperature measuring component, and is pressed against the object to be measured by the elastic force of the compression spring.

2. The temperature sensor according to claim 1, characterized in that, The heat-conducting insulating material is filled by means of pressurization + vibration.

3. The temperature sensor according to claim 2, characterized in that, The heat-conducting insulating material is Al2O3 material.

4. The temperature sensor according to claim 3, characterized in that, The density of the Al2O3 material is 3.9 - 4.0 g / cm 3 .

5. The temperature sensor according to claim 1, wherein The end of the protective sleeve is a convex-shaped heat-conducting block.

6. The temperature sensor according to claim 5, characterized in that, The heat conduction coefficient of the heat-conducting block is 429 w / mk.

7. The temperature sensor according to claim 1, characterized in that, The elastic structure component further includes a wiring device, and the wiring device is welded to the other end of the compression spring.

8. The temperature sensor according to claim 1, wherein The compression spring is made of stainless steel wire with a diameter of φ1.2 to φ1.6, the spring pitch ratio of the compression spring is 9 to 11, and the compression ratio of the compression spring is 20% to 22%.

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