Solid rocket engine nozzle with throat liner and expansion section integrated

The utility model provides a throat liner and expansion section integrated solid rocket engine jet pipe. The throat liner and expansion section integrated solid rocket engine jet pipe comprises a throat liner and expansion section integrated structure, a backing, a column section lining and a jet pipe shell. The back bush is sleeved and bonded on the outer peripheral wall of the integrated structure of the throat liner expansion section; the backing, the throat liner and expansion section integrated structure and the column section lining are arranged at the jet outlet end of the jet pipe shell; the outer peripheral walls of the back lining and the column section lining are connected with the inner peripheral wall of the spray pipe shell in a matched manner; the side end face of the column section lining is connected with the side end face of the integrated structure of the backing and the throat liner expansion section. The ablation uniformity of the nozzle throat liner and the expansion section of the solid