Method for sealing tenon on instrument shell

Abstract

The invention provides a method for sealing a tenon on an instrument shell. According to the method, a quick dry adhesive with Alpha-ethyl cyanoacrylate as a main component is applied into a gap between a flight parameter recorder shell and the tenon so as to achieve the aims of sealing and preventing liquid wax from flowing out. After the method is adopted, even if burning happens, since an adhesive layer in the gap is rapidly carbonized to form a solid blockage, the sealing function does not fail, so that electronic elements are effectively protected; the adhesive layer is not corroded when being soaked in seawater, therefore the protection time is prolonged and consequently the precious time is prolonged for search and rescue work.

Description

technical field [0001] The invention belongs to the technical field of sealing methods for instrument casings, in particular to a method for sealing tenons on an instrument casing, and is particularly suitable for sealing the tenon of a flight parameter recorder casing on an aircraft. Background technique [0002] The flight parameter recorder is used to record relevant flight data on the aircraft. When serious events such as air crashes and disintegration of the aircraft occur, it is convenient to trace the relevant situation. This product has extremely high requirements for fire resistance and seawater immersion resistance. In order to protect the internal recording electronic components, it is protected by filling it with paraffin wax of sufficient quality. In order to prevent the wax liquid from flowing out, it is necessary to effectively seal the tenon. At present, domestic and foreign flight parameter recorders generally adopt the method of welding with low melting poi...

AI Technical Summary

Problems solved by technology

In order to prevent the wax liquid from flowing out, it is necessary to effectively seal the tenon. At present, domestic and foreign flight parameter recorders generally adopt the method of welding with low melting point alloys. This method has the following disadvantages: 1. The welding operation is difficult. It is necessary to plate tin (or tin) on the shell and tenon, and then seal it with low melting point alloy welding after assembly. The process is long. At the same time, the product is large in size and weighs more than 5kg. It is not easy to dissipate heat quickly during welding. Heating to the melting temperature requires a high power soldering iron, difficult operation, and high labor intensity; 2. Due to the small gap between the tenon and the shell, the low melting point alloy has poor fluidity and is affected by temperature, so it is difficult to flow into the gap. , only attached to the surface or around the gap, and it is easy to fall off and fall off; 3. When an air accident occurs and encounters fire (800-1000 ° C), the low-melting point alloy will first melt and flow out, and the seal will fail, causing the wax liquid to flow out and the protection function will be lost; 4. , When immersed in seawater, the low-melting point alloy is extremely prone to corrosion, loses the sealing function, and shortens the protection time

The above-mentioned defects restrict the sealing effect of the shell tenon, so it is necessary to improve

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