Method for detecting and manufacturing temperature measurement heating element and device

Abstract

The invention provides 'a detection method, an inspection method and a manufacturing method for a temperature measuring electrothermal tube' and simultaneously provides 'a PTC electrothermal alloy characteristic apparatus', a detection device, an inspection device and a manufacturing device. The method comprises the relation between the resistance temperature coefficient and the resistivity of PTC electrothermal alloy, four stages of the development and evolution process of the temperature measuring electrothermal tube, the operating principle of the PTC electrothermal alloy characteristic apparatus, the process of manufacturing the temperature measuring electrothermal tube by utilization of the PTC electrothermal alloy characteristic apparatus, preparation of a PTC electrothermal alloy wire through auxiliary materials such as iron element and nickel element, the method for manufacturing the temperature measuring electrothermal tube by utilization of the PTC electrothermal alloy wire, the detection, the inspection and the method for forming the device. The invention analyzes various important temperature spots of the temperature measuring electrothermal tube, solves the problem of errors caused by various factors of the manufacturing technique of the temperature measuring electrothermal tube, meets the precision requirement, and simplifys temperature sensing, strain and heating of intelligent materials of the PTC alloy wire into an element to replace the lagged temperature control method of sensing, temperature signal processing and execution, simplifies the structure, and reduces the cost.

Description

Technical field [0001] The invention relates to the detection and manufacturing field of temperature measuring electric heating tubes, in particular to a method for detecting, inspecting and manufacturing temperature measuring electric heating tubes by using a PTC electric heating alloy characteristic meter. Background technique [0002] The temperature measurement of electric heating tubes has become known. Use thermocouples and thermal resistances to fix at a certain representative point of the electric heating tubes to produce corresponding micro-voltage or thermistor signals to be transmitted to the temperature controller with signal cables, and then to drive contactors, solid state relays, and The thyristor and other executive components adjust the voltage and power of the electric heating tube to control the temperature. This temperature control and constant temperature control has three processes: [0003] i The sensor is taken out to provide a temperature signal; [0004]...

AI Technical Summary

Problems solved by technology

[0007] 1 The temperature difference between the left and right ends of the industrial electric heating tube with a length of 3 to 15 m cannot be controlled;

[0008] 2 For the electric heating tube bundle formed on the flange, the temperature control method using the temperature measurement representative point will cause a large error

[0009] 3 As stated in the published documents CN2108391U and CN139949A, the rise of the tube temperature will cause the increase of its resistance, and then the heating power will decrease, which will play the function of power adjustment, constant temperature or temperature limit protection. The temperature of the spiral wire in the electric heating tube is higher than that of the shell surface much higher, and the actual temperature is uncertain

Therefore, the multi-channel process of smelting and drawing electrothermal alloy raw materials from nickel, iron, manganese, cobalt, niobium, silicon, titanium, and rare earth elements as a heating wire will cause large errors and deviations. There are three aspects: ① Formula calculation It cannot correctly and truly reflect the change law of the resistance value of the actual PTC electric heating alloy wire with temperature, and the exponential function is used to express the obvious limitations of the region; ② There are various inconsistencies in materials, equipment, operation, etc. ③ the accuracy of the general oven is not suitable for the detection of the resistance value of the PTC electric heating alloy wire with the change of temperature

Therefore, the accuracy of the design of the temperature measuring electric heating tube is affected, and even the expected service life cannot be reached.

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