Quick-response leakproof high-temperature thermocouple

Abstract

The invention belongs to a quick-response leakproof high-temperature thermocouple, which consists of a junction box, a protective casing and a temperature measurement element. The protective casing consists of an upper protective casing and a lower protective casing in coaxial arrangement; the upper end of the upper protective casing is fixedly arranged on the junction box; and the temperature measurement element is arranged in the protective casing coaxially, and a software wire at the upper end of the temperature measurement element is fixed on the junction box. The quick-response leakproof high-temperature thermocouple is characterized in that: an open reinforced tube is fixedly arranged at the lower end of the lower protective casing coaxially; and the lower end of the temperature measurement element is arranged in the reinforced tube out of the protective casing. The quick-response leakproof high-temperature thermocouple has simple structure, scientific and reasonable design, short response time in measurement, convenient replacement of a measurement core, high measurement accuracy and relatively high safety.

Description

technical field [0001] The invention belongs to thermocouples in the field of temperature sensors, in particular to a fast-response leak-proof high-temperature thermocouple. Background technique [0002] High-temperature thermocouples are used in a wide range of fields, especially in the process of ammonia synthesis in the petrochemical industry. The process detection temperature generally reaches above 800°C, the temperature changes frequently, and it is also accompanied by the erosion of the medium, so the technical requirements for thermocouples are very high. The thermocouples currently available on the market that can be used in this occasion all use ceramic platinum-rhodium thermocouples, which are mainly composed of three parts: an explosion-proof junction box, a corundum ceramic protective sleeve, and a ceramic temperature measuring element. The measuring end of the protective sleeve is closed. , one end of the temperature measuring element is fixed in the protective...

AI Technical Summary

Problems solved by technology

The thermocouples currently available on the market that can be used in this occasion all use ceramic platinum-rhodium thermocouples, which are mainly composed of three parts: an explosion-proof junction box, a corundum ceramic protective sleeve, and a ceramic temperature measuring element. The measuring end of the protective sleeve is closed. , one end of the temperature measuring element is fixed in the protective sleeve, and the other end is fixed in the explosion-proof junction box. Although high temperature measurement can be achieved, the following problems still exist: 1. The measuring end of the temperature measuring element is enclosed in the protective tube. The wall thickness of the bushing is thicker and the existence of the inner cavity space, the response time will be as long as 120s or more, it is difficult to realize the rapid sensing when the temperature changes; The inner wall is relatively close. Once the protective sleeve is washed and damaged, the damage rate of the internal temperature measuring element is extremely high, and because it is connected to the junction box, it will cause the overall damage of the high-temperature thermocouple, which increases the danger of thermocouple application.

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