An integrally formed excretory channel with variable cross-section

Abstract

The invention belongs to the field of helicopter structure design. The present invention provides an integrally formed discharge channel with variable cross-section. The cup body 7, conduit 8, filter screen 9 and protrusion 10 of the variable-section discharge channel are integrally formed by melting metal powder by laser, which simplifies the process and reduces the number of parts. Long-term work in the marine environment does not produce corrosion defects, and the overall deformation of the parts is small.

Description

technical field [0001] The invention belongs to the field of helicopter structure design, and relates to an integrally formed discharge channel with variable cross-section. Background technique [0002] A helicopter needs to design a drainage channel on the platform to discharge the residual oil generated by the engine, hydraulic device and other systems. The excretion channel is mainly composed of a cup body 1 , a conduit 2 and a filter screen 3 . At present, the excretion channel is often designed by welding, and the above parts are welded into one assembly. Among them, the filter screen is mainly processed and formed by sheet metal, the cup body is formed by sheet metal stamping or machined, the conduit is formed by pipe material, and the welds form welds 4 or solder spots 5 such as figure 1 and figure 2 as shown, figure 1 is the front view of the existing variable-section excretory channel, figure 2 It is a top view of the existing excretory channel with variable ...

AI Technical Summary

Problems solved by technology

[0003] The existing excretion channel has the following disadvantages: a) Due to the variable cross section of the excretion channel, different parts need to be designed for welding, and materials and processing methods of different specifications need to be used; b) The welding place is prone to corrosion when it works for a long time in the marine environment; c ) Welding will produce large deformation; d) Welding will reduce the inner pipe diameter; e) In order to ensure the welding quality, the thickness of the part should not be less than 0.8mm, and there is no room for weight reduction optimization; f) The bending radius of the catheter is affected by the diameter size Restrictions, if the requirements cannot be met, multi-section conduits need to be used for welding; g) If the cup body is stamped with sheet metal, the stamping depth and shape are limited. If it is machined, it will pay a weight price, and the wall thickness is not less than 1.2mm; h ) The size of the protrusion is limited by the diameter, wall thickness and material of the pipe 2, and the designability is low

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