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A fast response and high precision total temperature thermocouple head structure

A fast-response, high-precision technology, applied in thermometers, measuring heat, using electrical devices, etc., can solve the problems of reduced reliability of thermocouples, easy failure of even wires, and increased temperature measurement time constants of thermocouples

Active Publication Date: 2020-04-28
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, in order to reduce the temperature measurement time constant of the existing exposed thermocouple, a thinner diameter thermocouple wire is usually used to weld the wire junction, but the reduction in the size of the wire will reduce the reliability of the thermocouple. Coupled wires are prone to failure under severe vibration conditions
[0006] Patent CN103674304A discloses a thermocouple stagnation chamber, which can effectively reduce the thermocouple speed error and heat transfer error, but the appearance of the shield increases the structural complexity of the temperature measuring device and also increases the temperature of the thermocouple. Temperature measurement time constant

Method used

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  • A fast response and high precision total temperature thermocouple head structure
  • A fast response and high precision total temperature thermocouple head structure
  • A fast response and high precision total temperature thermocouple head structure

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Embodiment 1

[0025] figure 1 , figure 2 It is a structural schematic diagram of Embodiment 1 of the present invention. As shown in the figure, a fast-response high-precision total temperature thermocouple head structure is characterized in that it includes a protective sleeve (1), an insulating layer (2), two galvanic wires (3) of different materials, The dual wire contact (4), the windward side of the dual wire contact (4) is an airflow stagnation structure (41) including a plane. The distance between the plane of the plane stagnation structure (41) on the windward side and the center of the sphere of the couple wire contact (4) is 1 / 2 times the radius of the couple wire contact (4).

Embodiment 2

[0027] image 3 , Figure 4 It is a structural schematic diagram of Embodiment 2 of the present invention. As shown in the figure, a fast-response high-precision total temperature thermocouple head structure is characterized in that it includes a protective sleeve (1), an insulating layer (2), two galvanic wires (3) of different materials, The dual wire contact (4), the windward side of the dual wire contact (4) includes a concave hemispherical airflow stagnation structure (41).

[0028] In the described concave hemispherical surface stagnation structure (41), the radius of the concave hemisphere is 2 / 3 times the radius of the dual wire contact (4), and the center of the concave hemispherical surface is 2 from the center of the dual wire contact (4). / 3 times the radius of the even wire contact (4).

Embodiment 3

[0030] Figure 5 , Image 6 It is a structural schematic diagram of Embodiment 3 of the present invention. As shown in the figure, a fast-response high-precision total temperature thermocouple head structure is characterized in that it includes a protective sleeve (1), an insulating layer (2), two galvanic wires (3) of different materials, The dual wire contact (4), the windward side of the dual wire contact (4) includes a concave conical airflow stagnation structure (41).

[0031] The radius of the bottom surface of the cone surface airflow stagnation structure (41) is 2 / 3 times the radius of the dual wire contact (4), and the height of the cone surface is 2 / 3 times the radius of the dual wire contact (4).

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Abstract

The invention discloses a fast-response high-precision total-temperature thermocouple head structure. The fast-response high-precision total-temperature thermocouple head structure is characterized inthat the fast-response high-precision total-temperature thermocouple head structure comprises a protective casing (1), an insulating layer (2), two thermocouple wires (3) made of different materialsand a thermocouple wire contact (4), and the windward side of the thermocouple wire contact (4) comprises a planar or concave airflow stagnation structure (41). According to the fast-response high-precision total-temperature thermocouple head structure, airflow can be effectively stagnated, thus a larger proportion of the dynamic temperature is restored into the total temperature, the velocity error is effectively lowered, and the measurement accuracy of the total temperature is improved; and the stagnation structure (41) makes the thermal inertia of the head of the thermocouple wire contact to be smaller, and the response speed of total temperature measurement can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of airflow total temperature measurement, in particular to a fast-response high-precision total temperature thermocouple head structure. Background technique [0002] In the field of high temperature measurement, thermocouple has become a widely used temperature measuring device due to its advantages of high precision, wide temperature measurement range and simple operation. Due to the continuous improvement of the industrial application level and the requirements of scientific research experiments, the application environment of thermocouples is getting worse and worse, and the requirements for the temperature measurement accuracy of thermocouples are getting higher and higher. [0003] Taking the dynamic measurement of the total temperature of the airflow at the turbine outlet of an aeroengine as an example, thermocouples working in high temperature, high pressure, and strong vibration environments need to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/06
CPCG01K7/06
Inventor 马宏伟施磊
Owner BEIHANG UNIV
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