Embedded air inlet lip anti-icing heating assembly and manufacturing method

Abstract

The invention relates to the technical field of airplane electric heating deicing. The invention particularly relates to an embedded air inlet lip anti-icing heating assembly and a manufacturing method. The assembly comprises a heating function unit (1), a temperature measurement function unit (2), an overcurrent protection unit (3) and an electric connection unit (4). According to the heating assembly, a heating element and a temperature measuring element are integrally designed, and the heating assembly has the composite functions of heating and temperature measuring. The heating element is designed in a sine curve shape and has the advantages of being good in shape following with the composite material, easy to deform and resistant to fatigue; and the temperature measuring unit uses silver nanowires as a temperature sensing material to prepare a flexible temperature measuring unit, can measure the temperature of the whole heating surface, and can avoid the problems that: a traditional point type platinum resistor or thermocouple is large in size, and after the traditional point type platinum resistor or thermocouple is embedded into an aircraft composite material, the surface is prone to bulging, and strength is reduced.

Description

technical field [0001] The invention relates to the technical field of aircraft electrothermal deicing. Specifically relates to an embedded air inlet lip anti-icing heating component and a manufacturing method. Background technique [0002] The shape of the lip and air intake of the aircraft is a composite material and a relatively complex hyperbolic surface. Slight icing of the lip and air intake of the aircraft will reduce the flight performance of the aircraft and threaten the flight safety of the aircraft. / Deicing is mainly used in typical parts such as wings, tail fins, lips, air intakes, etc. Electric heating anti-icing is mainly divided into two structural forms: mounted electric heating anti-icing and embedded electric heating anti-icing. [0003] From the retrieval of relevant domestic and foreign materials, it can be seen that embedded heating technology has been applied to ordinary curved surfaces and thicker parts such as wings, empennages, and rotors of aircra...

AI Technical Summary

Problems solved by technology

[0005] (1) The conformal performance of traditional heating elements is poor

[0006] Due to the special thin-walled double-curvature structure of the lip, the commonly used heating elements are electric heaters, resistance wires or metal meshes. However, these heating elements are placed separately with composite materials, and the conformal curing is poor, and they are prone to delamination and lamination. Poor performance, which leads to defects such as poor glue and wrinkles in the composite material, which greatly affects the structural strength of the composite material

[0007] (2) The limitations of traditional point-type temperature measuring elements make it difficult to control temperature

[0009] Due to the large size of the traditional point-type platinum resistance or thermocouple, it is suitable to be installed outside the composite material, but it is difficult to embed it inside the composite material, and the surface of the aircraft skin is prone to bulges and reduced strength

[0010] The traditional point-type platinum resistance or thermocouple can only measure the temperature at a certain point. Due to the poor thermal conductivity of the composite material, if the number of sensors is small, the problem of inaccurate measurement will occur.

[0011] The temperature point is controlled, and the measurement is inaccurate. Due to the poor thermal conductivity of the composite material, uneven heating will occur, and "hot spots" will easily appear. Some parts cannot achieve the anti-icing effect, and some parts are overheated and cause unnecessary energy. waste

[0012] (3) Traditional overcurrent protection components have fewer on-off times and low reliability indicators

[0013] The traditional electric anti-icing heating overcurrent protection element adopts the traditional metal contact structure. As the number of "contact" on and off increases, the contact material will fatigue and age, and there is a risk of fracture. The reliability of the material is low, and it does not meet the new Requirements for anti-icing overcurrent protection technology

[0014] (4) The contact area of ​​traditional electrical connection components is small, and the lap resistance is large

[0016] A large area of ​​manual lap soldering is used between the traditional electrical connection element and the heating unit. Since the bus bar is made of metal material, the heat dissipation is faster, and the large area of ​​manual welding is difficult and the strength after welding is low.

[0017] The heating mesh used in traditional aircraft anti-icing is made of nickel complex alloy. The resistance wire has a large diameter and poor flexibility, so it cannot be made into a flexible heating functional unit suitable for the hyperbolic thin-walled air intake

Images