Metal bellows are usually used in bridge construction, and different structures have different characteristics, and different structures will reflect different waveforms. Waveform refers to the ripple shape and shape after cutting along the axis. The waveform of the bellows is basically U-shaped, C-shaped, ω-shaped and S-shaped. In order to improve the bearing capacity and reduce the stiffness, a multi-layer bellows and a bellows with reinforcing rings are introduced.

In general, the circular section is very good for the ability to withstand high pressure, but the displacement may be small. This U-shaped cross section allows for large displacement and relatively low pressure capacity. Usually, the wave shape commonly used in China is U-shaped ripple. Under the condition of high working pressure and large displacement, the multi-layer U-shaped corrugated structure is adopted. C-shaped bellows have high stiffness, poor sensitivity and large nonlinear error. They are often used as sealing isolation components or flexible couplings. ω-type and S-type bellows are mainly used for occasions with high working pressure and small working displacement. For example, it is used as a sealing and isolation component on high pressure valves.

Metal bellows end structure

The end structure of the connector at both ends of the bellows has 5 basic structural types:
(1) Internal coordination is represented by N
(2) The external call W represents
(3) The closed bottom is represented by D
(4) Peak QD meter has no straight wall truncation
(5) There is no straight wall truncation at the valley represented by Qd

The structure of the two ends of the bellows is arbitrarily combined by the above five structures, and the same kind of bellows can be combined into 14 structures.

Both ends of the bellows need to be welded together with the connected parts. Brass, tin bronze and beryllium bronze materials are brazed or silver welded; Argon arc welding, roll welding and electron beam welding methods are available for materials such as stainless steel and Inconel 718. The end structure of the bellows affects the forming process of the bellows. Among them, the W-shaped structure has the best manufacturability, and it is recommended to use it first. N-type structures are less manufacturable, and their diameter D1 and L1 lengths are best selected according to relevant standards and product samples. Cracked.