Current-limiting armoured heating cable and element

An armored heating cable and heating element technology, applied in the direction of heating element material, heating element shape, etc., can solve the problems of limited use, poor life and reliability, large power consumption of aircraft, etc., to reduce power loss, improve working life and Reliability, fast heating and effect of automatic adjustment of heating power

Inactive Publication Date: 2003-11-12
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional metal armored heater consists of alloy heating wire with constant resistivity, such as Ni80Cr20 alloy, etc., stainless steel metal sleeve and mineral insulating material magnesium oxide (MgO). Under the rated voltage, the

Method used

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  • Current-limiting armoured heating cable and element
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  • Current-limiting armoured heating cable and element

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010] Example 1: Heating cable

[0011] The chemical composition of the nickel-iron-based alloy heating wire is 70% Ni, 30% Fe. After vacuum melting, hot working, cold working and heat treatment, it is prepared into a certain diameter alloy wire, and it is combined with a metal sleeve (In.600, Stainless steel or pure nickel) and magnesium oxide insulation materials are assembled into metal armored cable blanks, and then heat-processed, cold-processed and heat-treated to form a current-limiting armored heating cable with a sleeve diameter of φ1.2mm, and its core diameter is φ0.25mm , The unit resistance value at room temperature is 3.3Ω / m, and its structure is as figure 1 , 1 is the heating wire, 2 is the magnesium oxide insulating material, and 3 is the alloy casing. The performance is shown in Table 1.

Example Embodiment

[0012] Example 2: Heating cable

[0013] The composition, process and structure of the alloy heating core wire and heating cable are the same as in Example 1. The armored heating cable blank is processed by heat, cold deformation and heat treatment to prepare an armored heating cable with a diameter of φ1.0mm. The core diameter is about φ0. 20mm, the unit resistance at room temperature is 7.5Ω / m.

Example Embodiment

[0014] Example 3: Heating element

[0015] The composition of the alloy core wire and the heating cable is the same as in Example 1. The formation of the element is to use one end of the armored heating cable as the working end, reduce the diameter to φ0.7×1000mm, and weld the core wire and the sleeve at the working end Connect to form a conductive loop. The other end of the cable is the lead end, that is, the cold end. The lead at this end and the sleeve are sealed with an insulating material, and the structure is as figure 2 , 1 is the heating wire, 2 is the magnesium oxide insulating material, 3 is the alloy casing, 4 is the welding point of the working end, and 5 is the lead end. The room temperature resistance of this heating element is 9Ω, and the performance is shown in Table 2.

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Abstract

The present invention relates to a current-limiting armored cable. It adopts the new type nickel-iron alloy heating thread, which chemistry element is that Ni:69-72%, Fe:31-28% w. The alloy thread and insulation material MgO powder are encapsulated in Inconel 600, the stainless steel or the nickel pipe to form the limiting current armored cable which diameter span is diameter 1.0-1.5 mm. Moreover the present invention provides a heating component made of the armored cable. The armored cable is machined into the changeable transect heating component, the end of the cable is welding point, and the other end is the sealed down-lead end. The ratio of the heating cable and the heating component is no little than 1.5. It can quickly heat and adjust heating power, increase the work life.

Description

technical field [0001] The invention relates to a metal casing armored heating cable and an element, which are used for anti-icing and de-icing heating of aircraft sensors. Different from traditional armored heating cables, this cable has the function of automatically adjusting the heating power as the temperature changes. Background technique [0002] The traditional metal armored heater consists of alloy heating wire with constant resistivity, such as Ni80Cr20 alloy, etc., stainless steel metal sleeve and mineral insulating material magnesium oxide (MgO). Under the rated voltage, the heating power of the heating cable remains constant , the heating cable consumes a lot of power for the aircraft, and because it is in a constant high-power working state for a long time, its life and reliability are poor, and its use is limited. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of traditional metal armored heaters, and ...

Claims

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Application Information

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IPC IPC(8): H05B3/12H05B3/40
Inventor 张平李多庄郭为民刘奇
Owner CHONGQING MATERIALS RES INST
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