Flow guide type expansion joint for high-speed medium

The invention relates to the technical field of expansion joint design, in particular to a flow guide type expansion joint for a high-speed medium. Comprising a compound expansion joint assembly and a guide cylinder assembly, the compound expansion joint assembly comprises an expansion joint inlet flange, and the guide cylinder assembly comprises a guide cylinder flange and a guide cylinder; an annular positioning groove is formed in the expansion joint inlet flange, and an annular positioning boss matched with the annular positioning groove is arranged on the guide cylinder flange; and the guide cylinder is sleeved in the compound expansion joint assembly. By arranging the flow guide assembly, under the condition that the transverse displacement absorption capacity of the expansion joint is not affected, the impact of a high-speed medium on the expansion joint is reduced, then the expansion joint body is protected, and the service life of the expansion joint body is prolonged. Accurate centering can be reali