A temperature sensor and method with an anti-lock structure

Abstract

The present invention relates to a temperature sensor and method with an anti-locking structure. The temperature sensor includes a temperature sensing element, a heat transfer element, a squeezing anti-locking element, and a sensor main body element. The temperature sensing element is installed in the heat transfer element. A plurality of heat conduction holes are distributed on one side of the heat transfer element in contact with the object to be measured, and the heat conduction holes penetrate through the entire heat transfer element and communicate with the temperature sensing element. The squeezing anti-locking element is arranged on the side of the heat transfer element not in contact with the object to be measured. When a force in the direction towards the heat transfer element is applied to the squeezing anti-locking element, the end of the squeezing anti-locking element can push the temperature sensing element, and an interference fit can be formed between the surface of the squeezing anti-locking element close to the heat transfer element and the side of the heat transfer element not in contact with the object to be measured. The sensor main body element is fixed to the squeezing anti-locking element by laser welding.

Description

Technical Field

[0001] The present invention relates to the technical field of precise temperature measurement, and in particular, to a temperature sensor and method with an anti-lock structure. Background Art

[0002] The accuracy of temperature measurement depends on the speed of the thermal equilibrium time between the temperature sensing element and the object to be measured in the external environment. Convective heat transfer is achieved through the heat energy migration of the moving medium particles in the air. The heat exchange caused by convective heat transfer is the result of the heat energy migration of these many moving medium particles. In fact, the convective phenomenon always occurs simultaneously with the heat conduction phenomenon, and they are inseparable. The movement of the natural convective fluid particles is the result of the local change of the medium density or the different medium specific gravities due to the uneven temperature at each point without additional external forces. A precise temperature sensor must have the special functions of reasonable heat conduction and accurate measurement of temperature with rapid thermal equilibrium.

[0003] Currently, the common structural forms of the above-mentioned sensors are usually divided into two types. The first type is that the sensing body is suspended in the protective tube and heat conduction is carried out through the air; the second type uses the material filled between the sensing body and the protective tube for heat conduction. However, the technology for positioning the sensing body is lacking in the above two solutions. Therefore, it is difficult to accurately fix the position of the sensing body, resulting in difficulty in achieving precise temperature measurement. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a temperature sensor and method with an anti-lock structure, which can anti-lock the temperature sensing element at the required accurate position, effectively accelerate the thermal equilibrium of the sensing element, thereby obtaining a rapid thermal response time of the sensing element and achieving temperature measurement accuracy.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to provide a temperature sensor with an anti-lock structure, including a temperature sensing element, a heat transfer element, an extrusion anti-lock element and a sensor main body element; the temperature sensing element is installed in the heat transfer element, and a plurality of heat conduction holes are distributed on one side of the heat transfer element in contact with the object to be measured, and the heat conduction holes penetrate through the entire heat transfer element and communicate with the temperature sensing element; the extrusion anti-lock element is arranged on the side of the heat transfer element not in contact with the object to be measured. When the extrusion anti-lock element receives a force in the direction towards the heat transfer element, the end of the extrusion anti-lock element can push the temperature sensing element, and an interference fit can be formed between the surface of the extrusion anti-lock element close to the heat transfer element and the surface of the heat transfer element not in contact with the object to be measured; the sensor main body element is fixed to the extrusion anti-lock element by laser welding.

[0006] The temperature sensing element is a thin film thermal resistor coated with an insulating layer.

[0007] One side of the heat transfer member in contact with the object to be measured is an arc-shaped end face, and the heat conduction holes are symmetrically distributed on the arc-shaped end face and arranged in a V shape.

[0008] The aperture of the heat conduction hole is φ1 - φ1.5 mm.

[0009] The density of the heat conduction holes is 1.8 - 2.25 per cm 2 。

[0010] One side of the extrusion anti-locking member close to the heat transfer member and the side of the heat transfer member not in contact with the object to be measured are both conical surfaces.

[0011] The angle of the conical surface is 45° - 60°.

[0012] The sensor main body is made of a high-temperature resistant alloy material.

[0013] The technical solution adopted by the present invention to solve its technical problems is: a method of using the temperature sensor with the above anti-locking structure. Install the temperature sensing member in the heat transfer member, apply an external force towards the heat transfer member to the extrusion anti-locking member. The extrusion anti-locking member moves towards the heat transfer member and its end pushes the temperature sensing member to the accurate position. The extrusion anti-locking member radially squeezes the heat transfer member, so that an interference fit is formed between the side of the extrusion anti-locking member close to the heat transfer member and the side of the heat transfer member not in contact with the object to be measured. The sensor main body locks the extrusion anti-locking member by laser welding to fix the position of the temperature sensing member. The multiple heat conduction holes of the heat transfer member conduct heat to the temperature sensing member to accelerate the thermal equilibrium of the temperature sensing member.

[0014] Beneficial effects

[0015] Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following advantages and positive effects: The present invention realizes the function of rapid thermal equilibrium of the object to be measured through the V-shaped arranged heat conduction through holes of the arc-shaped end face heat transfer member, and realizes the functions of accurately fixing the position of the sensing body and accurately measuring temperature by the interference fit between the outer conical surface of the conical extrusion anti-locking member and the inner conical surface of the arc-shaped end face heat transfer member. Description of the drawings

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic diagram when the present invention is in use. Detailed implementation manners

[0018] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0019] An embodiment of the present invention relates to a precise temperature sensor, as Figure 1 shown, which includes a temperature sensing element 1, a heat transfer element 2, a pressing and locking element 3, and a sensor main body element 4. The temperature sensing element 1 is installed in the heat transfer element 2. On one side of the heat transfer element 2 in contact with the object to be measured, a plurality of heat conduction holes 5 are distributed, and the heat conduction holes 5 penetrate through the entire heat transfer element 2 and communicate with the temperature sensing element 1. On the side of the heat transfer element 2 not in contact with the object to be measured, the pressing and locking element 3 is provided. When the pressing and locking element 3 is subjected to a force in the direction towards the heat transfer element 2, the end of the pressing and locking element 3 can push the temperature sensing element 1, and an interference fit can be formed between the surface of the pressing and locking element 3 close to the heat transfer element 2 and the side of the heat transfer element 2 not in contact with the object to be measured; the sensor main body element 4 is fixed to the pressing and locking element 3 by laser welding.

[0020] In this embodiment, the temperature sensing element 1 is composed of a thin film thermal resistor coated with an insulating layer. The temperature measurement range of this thin film resistor is: -59°C to 800°C, and the insulating material of the insulating layer can be selected from high silica materials.

[0021] The heat transfer element 2 of this embodiment is a porous high-temperature resistant metal body. The side in contact with the object to be measured is an arc-shaped end face, and the heat conduction holes 5 are symmetrically distributed and arranged in a V shape on the arc-shaped end face. The aperture of the heat conduction hole 5 is φ1 to φ1.5 mm, and the density of the heat conduction holes (that is, the number of heat conduction holes per unit area) is 1.8 to 2.25 per cm 2 . The cross-section of the heat conduction hole can be circular or elliptical.

[0022] In this embodiment, the surfaces of the pressing and locking element close to the heat transfer element and the side of the heat transfer element not in contact with the object to be measured are both conical surfaces. If the angle of this conical surface is too small, it is not easy to press, and if the angle is too large, it is difficult to form an interference fit. Therefore, the angle of the conical surface in this embodiment is 45° to 60°. In this embodiment, the pressing and locking element can be made of 70% sintered alumina, and this material has good laser welding performance, which can facilitate the connection with the sensor main body element 4.

[0023] The sensor main body element 4 in this embodiment is made of a high-temperature resistant alloy material, and its temperature resistance can be as high as 800 to 1000°C, and it has good laser welding performance.

[0024] It can be seen that the present invention realizes the rapid thermal equilibrium function for the object to be measured through the heat conduction through holes arranged in a V shape in the arc-shaped end surface heat transfer member, and realizes the functions of accurately fixing the position of the sensing body and accurately measuring the temperature by the interference fit between the outer conical surface of the conical extrusion anti-lock member and the inner conical surface of the arc-shaped end surface heat transfer member.

[0025] When performing heat conduction using the above-mentioned precise temperature sensor, the temperature sensing member 1 is installed inside the arc-shaped end surface heat transfer member 2. As Figure 2 shown, an external force is applied to the conical extrusion anti-lock member 3. The conical extrusion anti-lock member 3 moves towards the arc-shaped end surface heat transfer member 2 and its end pushes the temperature sensing member 1 to the accurate position. The conical extrusion anti-lock member 3 radially extrudes the arc-shaped end surface heat transfer member 2, so that an interference fit is formed between the conical surface of the conical extrusion anti-lock member 3 and the inner conical surface of the arc-shaped end surface heat transfer member 2. The sensor main body member 4 anti-locks and fixes the conical extrusion anti-lock member 3 by laser welding, thereby accurately fixing the position of the temperature sensing member 1. The multiple heat conduction holes of the arc-shaped end surface heat transfer member 2 conduct heat to the temperature sensing member 1, accelerating the thermal equilibrium of the temperature sensing member, so as to obtain a rapid thermal response time of the sensing element and achieve a reliable implementation of accurate temperature measurement.

[0026] It is measured through experiments that when the precise temperature sensor of the present embodiment is used for experiments, its thermal response time ≤ 1.5 s, while the thermal response time of the existing air conduction method ≤ 5 s, and the thermal response time of the existing filling material method ≤ 3 s. It can be seen that the temperature measurement effect of the precise temperature sensor of the present embodiment is significantly better than the existing methods, so it has the characteristics of excellent heat conduction performance and rapid thermal response time.

Claims

1. A temperature sensor with an anti-locking structure, characterized in that, It includes a temperature sensing element, a heat transfer element, a pressing and anti-locking element, and a sensor main body element; the temperature sensing element is installed inside the heat transfer element, and a plurality of heat conduction holes are distributed on the surface of the heat transfer element in contact with the object to be measured, and the heat conduction holes penetrate through the entire heat transfer element and communicate with the temperature sensing element; the pressing and anti-locking element is arranged on the surface of the heat transfer element not in contact with the object to be measured. When the pressing and anti-locking element is subjected to a force in the direction towards the heat transfer element, the end of the pressing and anti-locking element can push the temperature sensing element, and an interference fit can be formed between the surface of the pressing and anti-locking element close to the heat transfer element and the surface of the heat transfer element not in contact with the object to be measured; the sensor main body element is fixed to the pressing and anti-locking element by laser welding; the surface of the heat transfer element in contact with the object to be measured is an arc-shaped end face, and the heat conduction holes are symmetrically distributed on the arc-shaped end face and are arranged in a V shape; the surface of the pressing and anti-locking element close to the heat transfer element and the surface of the heat transfer element not in contact with the object to be measured are both conical surfaces.

2. The temperature sensor with an anti-locking structure according to claim 1, characterized in that, The temperature sensing element is a thin film thermal resistor coated with an insulating layer.

3. The temperature sensor with an anti-lock structure according to claim 1, characterized in that, The aperture of the heat conduction hole is φ1 - φ1.5mm.

4. The temperature sensor with an anti-lock structure according to claim 1, characterized in that, The density of the heat conduction holes is 1.8 to 2.25 holes / cm 2 .

5. The temperature sensor with an anti-locking structure according to claim 1, wherein The angle of the conical surface is 45° - 60°.

6. The temperature sensor with an anti-lock structure according to claim 1, wherein The sensor main body element is made of a high-temperature resistant alloy material.

7. A method of using a temperature sensor with an anti-lock structure as described in any one of claims 1-6, characterized in that, Install the temperature sensing element inside the heat transfer element, apply an external force towards the heat transfer element to the pressing and anti-locking element, the pressing and anti-locking element moves towards the heat transfer element and its end pushes the temperature sensing element to the accurate position, the pressing and anti-locking element radially presses the heat transfer element, so that an interference fit is formed between the surface of the pressing and anti-locking element close to the heat transfer element and the surface of the heat transfer element not in contact with the object to be measured, and the sensor main body element locks the pressing and anti-locking element by laser welding to fix the position of the temperature sensing element. The plurality of heat conduction holes of the heat transfer element conduct heat to the temperature sensing element to accelerate the thermal equilibrium of the temperature sensing element.

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