There are many forms of expansion joints. According to the cross-sectional shape, there areU type,Ωshape,S type, etc., among the tube and tube heat exchangers, the most commonly used ones areUCorrugated expansion joint.UThe expansion joint is mainly composed of two parts: a corrugated tube and a straight edge section. If necessary, it may also be equipped with a lining tube, a reinforcing ring, etc.
Tube and tube heat exchangerExpansion joints can also be divided into single-layer and multi-layer expansion joints:
1. For heat exchangers, single-layer corrugated expansion joints should be selected first on the premise of meeting the design requirements of load-bearing capacity, compensation stiffness and fatigue life.
2, Under the following circumstances, multi-layer corrugated expansion joints can be used:
(1) must withstand higher pressure and require greater displacement compensation capability;
(2) to withstand higher fatigue life requirements.
The characteristics of the multi-layer corrugated expansion joint structure of the tube and tube heat exchanger are as follows:
1, good flexibility and high compensation ability;
2, The fatigue life is higher than that of single-layer structure;
3, compact structure, saving materials;
4, Under high pressure conditions, it will not burst suddenly and is not likely to be dangerous.