Multi-measurement-point temperature sensor

Abstract

The invention discloses a multi-measurement-point temperature sensor. The multi-measurement-point temperature sensor comprises metal armor layers, a plurality of thermo wires are arranged orderly in the metal armor layers, the multi-measurement-point temperature sensor is characterized in that the thermo wires are isolated through aluminum oxide insulating layers, the thermo wires and the metal armor layers are isolated through aluminum oxide insulating layers, the thermo wires form multiple temperature measurement points in the metal armor layers in the axial direction, further, the thermo wires comprise one positive thermo wire and the negative thermo wires of which the number is matched with that of the temperature measurement points, and the position, corresponding to one negative thermo wire, of each temperature measurement point is welded with the positive thermo wire. The multi-measurement-point temperature sensor has the advantages that an insulating filler of a thermocouple ismade from aluminum oxide, thereby being capable of overcoming the defects that an insulating material is leaked, the insulating performance is reduced, and the thermocouple detection is out of orderdue to the breakage of the armor layers; thermo wire arrangement is carried out through a mode of jointly using positive poles so that the number of the temperature measurement points can be further increased on the armor layers of the same caliber, and the structure and wiring of the thermocouple is simpler.

Description

technical field [0001] The invention relates to the technical field of temperature measuring elements, in particular to a multi-measuring point temperature sensor. Background technique [0002] With the development of the chemical and petroleum industries, the process control of the production process is becoming more and more refined, especially for the control of the temperature of the reactor used in the production process, it is often necessary to monitor the temperature of multiple points in the reactor. At present, the most commonly used temperature detection device on the market is a thermocouple, which is composed of two conductors or semiconductors with different components to form a closed loop. When the junction temperature is different, a thermal current is generated in the circuit. If there is a temperature difference between the measuring end of the thermocouple and the reference end, the display instrument will indicate the temperature value corresponding to ...

AI Technical Summary

Problems solved by technology

Taking the EO reactor as an example, there are generally more than 30 temperature measuring points. If more than 30 holes are opened on the EO reactor and more than 30 casings are installed in the reactor, the structure of the reactor will inevitably be very abnormal. Complex, and more than 30 flange joints, the leakage points will undoubtedly increase, and the overall strength of the reactor will also be affected

Another way is to use multi-point thermocouples. At present, the commonly used multi-point thermocouple temperature measurement products at home and abroad usually package multiple armored temperature measurement cores in a metal protection tube. Although this method has a certain improvement in space , but the temperature measuring core cannot be in direct contact with the medium, the temperature response time is long, and the measurement results often have thermal conductivity errors

At the same time, the insulating fillers of these multi-point thermocouples are all made of magnesium oxide, which makes them unsuitable for EO reactors, because during the working process of EO reactors, the armor layer of thermocouples is eroded by air flow and friction of catalysts, which is easy to cause damage. The armor layer is damaged, and once the armor layer is damaged, the leakage of magnesia and the reaction of water vapor will cause the EO catalyst to harden and lose its activity, which will affect the reaction air flow and cause the reaction temperature to be distorted; if the magnesia leakage is serious, the insulation of the thermocouple performance will be greatly reduced, or even unusable

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