Spreading pulse injection device of scramjet engine

The invention provides a spanwise pulse injection device of a scramjet engine, which comprises a spanwise injection cylinder body and at least two parallel pulse injection assemblies communicated with the spanwise injection cylinder body, the pulse injection assembly comprises a first valve body, a second valve body, a movable valve element arranged at the outlet end of the second valve body and a nozzle base which are sequentially installed in the fuel oil flowing direction. At least two buffering cavities which are symmetrical along the axis of the second valve body are formed in the connecting position of the third valve seat and the second valve seat, buffering elastic pieces are arranged in the buffering cavities, and pressure relief pipelines communicated with the second cavity are arranged at the ends, close to the buffering springs, of the buffering cavities. The fuel injector has the beneficial effects that by designing the four buffer cavities, the pressure relief pipeline and the buffer elastic pie