Front sectional structure of external cylinder of moderate pressure turbine

The utility model discloses a front section structure of the intermediate pressure industrial steam turbine, comprising an outer casing 1, the nozzle blades 6 are arranged on the front section of the outer cylinder 1, the nozzle blades 6 are directly assembled on the front section of the outer cylinder 1 with a connection screw 4 through a nozzle ring 5. The front section structure of the intermediate pressure industrial steam turbine outer casing is applied in M serial steam turbine, which not only comprises the steam inlet chamber and steam chamber function of outer casing front section in three and seven serial steam turbine but also reduces a plurality of steam turbine parts due to the steam chamber is cancel, as well as the connection part and the adjusting parts between the steam chamber, the outer casing and the steam chamber are reduced, so the volume of the outer casing is greatly reduced. The connection parts such as the horizontal split bolt in the outer casing are reduced, so the manufacturing is simplified, the manufacturing period is reduced and the manufacture cost is reduced. The steam leakage between the outer casing and the steam chamber is eliminated, the heat efficiency is further improved and the operation economy of the steam turbine is improved.