Heating assembly for aviation ice prevention and removal

Abstract

The utility model discloses a heating assembly for aviation ice prevention and removal, and belongs to the technical field of aviation ice prevention and removal. Comprising an electric heating film (1), an adhesive film (2), a metal conductive band (3) and a wiring terminal (4), the adhesive films (2) are pasted on the upper surface and the lower surface of the electric heating film (1), the metal conductive belt (3) is laid on the edge of a complex formed by the electric heating film (1) and the adhesive films (2), and the wiring terminal (4) is welded on the metal conductive belt (3). The utility model has the characteristics of light weight and uniform heat distribution.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation anti-icing and de-icing, in particular to a heating component for aviation anti-icing and de-icing. Background Art

[0002] Aviation anti-icing heating components are commonly used in the wings, tails and windshields of fixed-wing aircraft. The basic principle is to apply voltage to the heating components to heat the electric heating film in the heating components. The generated heat is transferred to the aircraft skin, increasing the skin surface temperature, making it difficult for supercooled water to freeze on the aircraft surface during flight, thus achieving the effect of anti-icing. However, the current heating components have problems such as heavy weight and uneven heat distribution. Utility Model Content

[0003] The purpose of the utility model is to provide a heating component for aviation anti-icing and deicing. The utility model has the characteristics of light weight and uniform heat distribution.

[0004] The technical solution of the utility model is: a heating component for aviation anti-icing, comprising an electric heating film, an adhesive film, a metal conductive tape and a wiring terminal; the adhesive film is attached to the surface of the electric heating film, the metal conductive tape is laid on the edge of the composite body composed of the electric heating film and the adhesive film, and the wiring terminal is welded on the metal conductive tape.

[0005] In the aforementioned aviation anti-icing heating assembly, the electric heating film is woven based on electric heating wires and insulating fibers.

[0006] In the aforementioned aviation anti-icing heating assembly, the heating wire is a nickel wire or a constantan wire, and the diameter of the heating wire is 0.1 mm to 0.2 mm.

[0007] In the aforementioned aviation anti-icing heating assembly, the insulating fiber is nylon yarn or polymer yarn.

[0008] In the aforementioned heating assembly for aviation anti-icing, the adhesive film is one of a high-temperature structural adhesive film, a medium-temperature structural adhesive film, and a low-temperature structural adhesive film of an epoxy system.

[0009] In the aforementioned aviation anti-icing heating assembly, the metal conductive belt is fixedly connected to the electric heating film by flame brazing or pulse hot pressing welding.

[0010] In the aforementioned aviation anti-icing heating assembly, the metal conductive belt is fixedly connected to the wiring terminal by flame brazing or furnace brazing.

[0011] In the aforementioned aviation anti-icing heating assembly, the electric heating film and the adhesive film are rolled and bonded into a composite body.

[0012] The utility model has the advantages that the electric heating film structure formed by weaving the metal heating wire and the insulating fiber has the advantages of light weight and uniform heat distribution.

[0013] The electric heating film with a single-layer structure woven from heating wires and insulating fibers has anisotropic mechanical properties of the insulating fibers in space. During operation, large thermal stress will be generated within and between layers of the electric heating anti-icing material formed by the electric heating film, causing the laminated structure to be prone to deformation and stratification. In order to overcome this technical problem, the utility model compounds the electric heating film with the adhesive film so that the heating component has good mechanical properties, temperature controllability and heating rate.

[0014] The adhesive film of the utility model adopts an epoxy system resin similar to the resin system of the aircraft matrix material, has better bonding performance with the aircraft air inlet matrix, and is not easy to delaminate after co-curing.

[0015] The heating component of the utility model can be applied to engineering fields with electric heating requirements, such as helicopter air inlet anti-icing. The heating component can not only meet the mechanical performance requirements of the load-bearing structure, but also can be specially designed for different surfaces to provide effective heating efficiency and balanced temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] Example 1. A heating assembly for aviation deicing, see Figure 1 , including an electric heating film 1, an adhesive film 2, a metal conductive tape 3 and a terminal 4; the adhesive film 2 is attached to the upper and / or lower surface of the electric heating film 1, the metal conductive tape 3 is laid on the edge of the composite body composed of the electric heating film 1 and the adhesive film 2, and the terminal 4 is welded on the metal conductive tape 3.

[0019] The aforementioned electric heating film 1 is woven based on electric heating wires and insulating fibers.

[0020] The aforementioned electric heating wire is nickel wire or constantan wire, and the diameter of the electric heating wire is 0.1mm to 0.2mm. Compared with traditional heating elements, nickel wire or constantan wire has good ductility and better matching with insulating fiber; and traditional heating elements have high tension, low elasticity, and higher weight per unit area. Through the woven structure of the electric heating wire and the insulating fiber, the electric heating film has more moderate tension, better elasticity, and lower weight per unit area.

[0021] The aforementioned insulating fiber is nylon yarn or polymer yarn.

[0022] The aforementioned adhesive film 2 is one of a high-temperature structural adhesive film, a medium-temperature structural adhesive film, and a low-temperature structural adhesive film of an epoxy system.

[0023] The aforementioned metal conductive belt 3 is fixedly connected to the electric heating film 1 by flame brazing or pulse hot pressing welding. The traditional heating element is a series structure with a Z-shaped wiring. If a heating element is damaged somewhere, the heating function will fail. In the utility model, the electric heating film and the metal conductive belt are in a parallel structure, and a small amount of damage will not affect the overall heating effect.

[0024] The aforementioned metal conductive strip 3 is fixedly connected to the terminal 4 by flame brazing or furnace brazing. The electrodes and leads of the conventional heating element are soldered, which has low strength, high brittleness at the soldered part, low temperature resistance, and easy desoldering. The metal conductive strip and the terminal connected by brazing have high strength, high temperature resistance, and are not easy to desolder. At the same time, the terminal is more resistant to bending and vibration than the wire.

[0025] The electric heating film 1 and the adhesive film 2 are rolled and bonded into a composite body. Compared with the traditional heating element, the adhesive film has a similar resin system to the aircraft composite matrix. After rolling with the electric heating film, it has better bonding with the aircraft air inlet matrix and is not easy to delaminate after co-curing.

[0026] The method for preparing the heating component comprises the following steps:

[0027] Use a knitting machine to weave the electric heating film. Design the arrangement of the electric heating film on Solidworks and import it into the computer of the knitting machine. Adjust the process parameters of the technology on the knitting machine and set the knitting mode. Install the metal wire and insulating fiber, hold the reserved metal wire to the presser foot, turn on the knitting machine, and let the continuous upper thread pass through the zigzag lock needle with upper and lower threads to fix the metal wire and insulating fiber together.

[0028] Knitting is completed. Stop the machine, pull the operating lever to stop weaving, remove the special clamping frame, lay out the woven base fabric neatly, and cut off the unwoven part with special scissors to obtain the electric heating film.

[0029] Roller pressing. Feed the rubber film with an area of ​​200mm*400mm and a thickness of 0.1mm and the electric heating film of the same size into the roller press to bond the rubber film and the electric heating film together to form a multi-layer structure.

[0030] Welding metal conductive tape. Align the metal conductive tape with a size of 250mm*10mm and a thickness of 0.2mm with the short side of the composite body composed of the electric heating film and the adhesive film, so that one end of the metal conductive tape protrudes 50mm, and put the aligned metal conductive tape and the composite body into a pulse hot press welding machine for welding.

[0031] Weld the terminal. Align the terminal with the metal conductive strip protruding from the electric heating film, and solder them using Ag45CuZnCdNi at a temperature of 800-1000°C.

[0032] In the utility model, the electric heating film is heated by applying direct current or alternating current to both ends of the wiring terminals, and Joule heat is generated by the current, so that the surface temperature of the electric heating film changes, and finally the electric heating film can be heated evenly.

Claims

1. A heating assembly for aviation anti-icing, characterized in that: The invention comprises an electric heating film (1), an adhesive film (2), a metal conductive tape (3) and a terminal (4); the adhesive film (2) is attached to the surface of the electric heating film (1), the metal conductive tape (3) is laid on the edge of the composite body formed by the electric heating film (1) and the adhesive film (2), and the terminal (4) is welded on the metal conductive tape (3); the electric heating film (1) is woven based on electric heating wire and insulating fiber.

2. The aviation anti-icing heating assembly according to claim 1, characterized in that: The heating wire is a nickel wire or a constantan wire, and the diameter of the heating wire is 0.1 mm to 0.2 mm.

3. The aviation deicing heating assembly according to claim 1, characterized in that: The insulating fiber is nylon yarn or polymer yarn.

4. The aviation deicing heating assembly according to claim 1, characterized in that: The adhesive film (2) is one of a high-temperature structural adhesive film, a medium-temperature structural adhesive film, and a low-temperature structural adhesive film of an epoxy system.

5. The aviation anti-icing heating assembly according to claim 1, characterized in that: The metal conductive belt (3) is fixedly connected to the electric heating film (1) through flame brazing or pulse hot pressing welding.

6. The aviation deicing heating assembly according to claim 1, characterized in that: The metal conductive strip (3) is fixedly connected to the wiring terminal (4) by flame brazing or furnace brazing.

7. The aviation anti-icing heating assembly according to claim 1, characterized in that: The electric heating film (1) and the adhesive film (2) are rolled and bonded to form a composite body.

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