Gas temperature sensor and manufacturing method thereof

Abstract

The invention belongs to the technical field of temperature measurement, and in particular relates to a temperature sensor for measuring gas temperature and a manufacturing method thereof. The temperature sensor includes a housing, two thermocouple wires, a sleeve, glass powder and a pressure sleeve: the improvement is: the sleeve is an alkali-free glass fiber sleeve; the diameter of the alkali-free glass fiber sleeve is is 0.7mm. The manufacturing method of the temperature sensor consists of the following four steps: 1) assembly; 2) potting; 3) sintering; 4) fixing. By using the temperature device of the present invention, the structure is simple, the manufacturing process is reasonable, and its good performance can be guaranteed under the environment of high pressure, strong vibration and impact.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and in particular relates to a temperature sensor for measuring gas temperature. Background technique [0002] During the development of a new generation of liquid rocket engines, it is necessary to measure the temperature of the gas medium under high pressure, strong vibration and shock environment. [0003] The existing thermocouple temperature sensor includes: housing, thermocouple wire, sleeve (the sleeve is made of quartz fiber sleeve), glass powder and pressure sleeve; wherein, the diameter of the inner cavity of the housing is 3.2mm, and the two thermocouple wires are respectively Insert a quartz fiber sleeve with a diameter of 1.1mm and insert it into the shell, and then fill the inner cavity of the shell with glass powder. This structure has the following two problems: [0004] 1. Due to the large diameter and rough surface of the quartz fiber sleeve, the potting space ...

AI Technical Summary

Problems solved by technology

After the shell and the pressure sleeve are assembled, laser welding is used to effectively connect the two at the edge of the pressure sleeve. However, in actual use, it is found that the high-temperature alloy has poor welding performance. The temperature sensor is easily damaged when used in a vibration and shock environment

[0006] In addition, there are also problems in the manufacturing process of the above-mentioned temperature sensor: the glass frit potting process of the existing temperature sensor is one-time potting. , so that the gas at the temperature measuring end is not easy to discharge

This sintering process cannot fully soften the glass powder, and the molten glass cannot completely fill the temperature measuring end, so that a large gap is formed at the temperature measuring end after the glass powder is sintered, and the thermocouple wire is fatigued and broken in a strong vibration and impact environment.

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