Quick response temperature measuring thermocouple for casting mold

Abstract

The invention discloses a quick response temperature measuring thermocouple for casting a mold. The device comprises two thermocouple wires which are arranged in a protective sleeve and are connectedby a metal joint at a hot end. The metal joint is a truncated cone structure, the longitudinal section of the metal joint is trapezoidal, and a trapezoidal center is a hollow structure. The contact part of the metal joint and a mold temperature measuring hole is a smooth plane, at the same time, the corresponding contact plane of the metal joint in the mold temperature measuring hole is also processed into a smooth plane. The thermocouple is externally provided with a covering sleeve, a cross section of a contact part of the front end of the covering sleeve and the mold is a shape adapted to the contour of the outer surface of the mold, and a sealing material is arranged on a contact surface between the front end of the covering sleeve and the mold. The thermocouple and the rear end of thecovering sleeve are connected to a driving mechanism to realize forward and backward movement. According to the quick response temperature measuring thermocouple, the heat after the temperature riseof the mold is rapidly transferred to the thermocouple, and the rapid response of the thermocouple to a temperature is realized. The smooth contact surface of the thermocouple metal joint is protectedfrom being affected by an environment. The metal joint is insulated from thermocouple parts other than the thermocouple wires, and interference is avoided.

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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