Rigid expanding device of shape memory alloy pipe joint with inner rib

Abstract

The invention relates to a rigid expanding device of a shape memory alloy pipe joint with an inner rib. The device comprises four parts of a conical pressure head, a radial expanding mold, the shape memory alloy pipe joint and a limiting block. In order to realize overall and uniform expanding deformation of the pipe joint with the inner rib and no harm to the inner rib of the pipe joint in installation and disassembly of the radial expanding mold, the radial expanding mold is designed as a combined form, and is formed by combining 7 1 / 8 modules, one trapezoidal module and one parallel module. In order to realize no harm to the inner rib in the expanding deformation process of the pipe joint with the inner rib, a groove is formed in the outer wall of the radial expanding mold. Compared with the prior art, the device has such advantages of no harm to the inner rib of the shape memory alloy pipe joint, uniform radial deformation of the pipe joint, simple expanding device, convenience to machine the mold, low cost, convenience to mount before expanding and convenience to disassemble after expanding, and adaptation to expansion of shape memory alloy pipe joints with various types.

Description

technical field [0001] The invention relates to a shape memory alloy pipe joint diameter expansion technology, in particular to a shape memory alloy pipe joint rigid diameter expansion device with internal ribs. Background technique [0002] The traditional connection method of aircraft hydraulic, pneumatic and fuel systems is mainly flare connection, which is the most extensive and mature connection form. However, this connection method is heavy in weight and complex in structure, especially when it is connected with important load-bearing structures, it has a great impact on the static strength and fatigue strength of the structure, the process is complicated, and the reliability and safety are relatively poor. At present, the world's advanced aircraft manufacturing countries have widely adopted the non-flare connection method of shape memory alloy pipe joints, and my country's aviation, aerospace, nuclear power and other fields have also begun to adopt the non-flare conne...

AI Technical Summary

Problems solved by technology

In the current actual production, the diameter expansion method of the shape memory alloy pipe joint with internal ribs usually adopts the rigid expansion rod to forcibly expand the diameter. This expansion method will cause serious damage to the internal ribs of the shape memory alloy pipe joint. Uneven deformation, which will seriously affect the recovery force of shape memory alloy pipe joints and the sealing performance of pipeline connections

The patent "Expansion Device for Shape Memory Alloy Pipe Joints Based on Liquid Medium" (patent number: ZL201210073520.6) introduces a hydraulic expansion method, which is complicated, inconvenient to operate, and difficult to precisely control the expansion amount. Both ends are prone to damage due to line contact

The patents "A Diameter Expanding Device for Shape Memory Alloy Pipe Joints" (Patent No.: ZL 201320553854.3) and "A Radial Telescopic Tube for Diameter Expansion of Shape Memory Alloy Pipe Joints" (Patent No.: ZL201310403082.X) adopt radial Expand the diameter of the shape memory alloy pipe joint with ribs by means of telescopic tube. This expansion method can obtain uniform diameter expansion deformation and protect the internal ribs of the pipe joint, but it is difficult to obtain a large diameter expansion, and for For pipe joints with relatively small inner diameters, this kind of radial expansion pipe based on open slots at both ends will have disadvantages such as difficult installation and disassembly, and inconvenient use.

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