A thermocouple suitable for measuring flame temperature by dynamic method and its manufacturing method

Abstract

The invention discloses a thermocouple suitable for dynamic method flame temperature measurement. The thermocouple includes two thermocouple wires, a thermocouple wire node, an insulating busing, a protective busing and compensation conductors; the thermocouple wire node is formed by welding the two thermocouple wires; the thermocouple wire node is circular-sheet-shaped; the two thermocouple wires are an upper thermocouple wire and a lower thermocouple wire respectively; the included angle between the tangent line of a contact point of the upper thermocouple wire and the thermocouple wire node and the tangent line of a contact point of the lower thermocouple wire and the thermocouple wire node ranges from 30 degrees to 60 degrees; and the upper thermocouple wire and the lower thermocouple wire respectively pass through two wire entering holes of the insulating busing, and then are connected with the two compensation conductors on the protective busing. According to the thermocouple of the invention, the circular-sheet-shaped thermocouple wire node is adopted, so that the heat conduction loss of the thermocouple wires can be decreased, and the thermal inertia and temperature nonuniformity of the thermocouple wire node can be decreased, and interference of the thermocouple on flames and the deposition of particles in the flames on the surface of the thermocouple can be decreased, and the accuracy and sensitivity of temperature measurement can be improved, so that the temperature of the flames can be obtained quickly and accurately.

Description

technical field [0001] The invention belongs to the field of thermocouples, and more specifically relates to a thermocouple suitable for measuring flame temperature by a dynamic method and a manufacturing method thereof. Background technique [0002] The flame produced by combustion is a phenomenon accompanied by complex physical and chemical processes such as chemical reaction, flow and heat transfer, and temperature is a very important factor and parameter. [0003] Using thermocouples to measure temperature is a very direct and effective method, and the measurement can usually be divided into steady state method and dynamic method. Among them, the steady-state method is to make the thermocouple, the measured object and the surrounding environment reach or approach thermal equilibrium (temperature stability). Under the circumstances, the radiation heat transfer between the thermocouple and the surrounding environment and the heat conduction of the thermocouple itself will...

AI Technical Summary

Problems solved by technology

The key point of the dynamic method is that the radiation loss and heat conduction loss of the thermocouple can be effectively controlled during the measurement process. The structural form of the thermocouple has a great influence on the heat transfer characteristics and temperature response curve. The welding of the thermocouple wire of the traditional thermocouple The paired wire junctions formed together are generally spherical, and the thermocouples with spherical dual wire junctions have the disadvantages of large time constants (also called thermal inertia coefficients) and insufficient sensitivity.

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