A fast response temperature measuring thermocouple for casting mold

Abstract

The invention discloses a fast-response temperature-measuring thermocouple device for casting, which comprises two thermocouple wires, which are located in a protective sleeve and connected at the hot end by a metal joint. Hollow structure, the contact part between the metal joint and the temperature measuring hole of the mold is a smooth plane, and the corresponding contact surface between the temperature measuring hole of the mold and the metal joint is also processed into a smooth plane; The cross-section of the contact part between the front end and the mold is in a shape suitable for the outer surface of the mold, and a sealing material is provided on the contact surface between the front end of the sheath and the mould; The invention enables the heat of the mold to be rapidly transferred to the thermocouple after the mold is heated up, so as to realize the rapid response of the thermocouple to the temperature. Protects the smooth contact surfaces of thermocouple metal junctions from the environment. The metal junction is insulated from the thermocouple parts except the thermocouple wire, avoiding interference.

Description

technical field [0001] The invention belongs to the technical field of casting equipment, and in particular relates to a temperature-measuring thermocouple capable of rapid response. Background technique [0002] Thermocouple is a commonly used temperature measuring element in temperature measuring instruments. The basic principle of thermocouple temperature measurement is that two material conductors with different components form a closed loop. When there is a temperature gradient at both ends, current will flow through the loop. At this time There is a measurable thermal emf between the two ends. Two homogeneous conductors with different components are thermal electrodes, the end with higher temperature is the working end, or measuring end, hot end, and the end with lower temperature is free end, or reference end, cold end. According to the functional relationship between thermoelectromotive force and temperature, the thermocouple index table is obtained under the condit...

AI Technical Summary

Problems solved by technology

At present, the thermocouple used for industrial temperature measurement has a basic structure including thermocouple wire, insulating tube, protection tube and junction box. The wire is installed in a sealed sleeve filled with insulating material. When measuring, the outer end of the sleeve is usually equipped with a protective tube. The front part of the metal sleeve is in contact with the measured object. When the temperature of the measured object is higher than the temperature of the metal sleeve, the heat is taken The measured object-sleeve-insulating material (or air)-temperature-measuring node conducts sequentially, so that the temperature-measuring node reaches the same temperature as the measured object, and then performs measurement. During this process, due to the heat passing through the metal sleeve and The insulating material (or air) takes a certain amount of time, especially the thermal conductivity of the insulating material or air is very low, so the existing armored thermocouple responds slowly. According to the literature, the traditional thermocouple usually responds within 10 More than seconds, unable to meet the temperature measurement and temperature control requirements of modern foundry production

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