Steam supplementing chamber structure of steam turbine cylinder

The invention discloses a steam supplementing chamber structure of a steam turbine cylinder, and belongs to the technical field of steam turbines. The steam supplementing chamber structure of the steam turbine cylinder comprises an annular main steam flow channel formed between the cylinder and a rotor; a mixing ring cavity is formed in the cylinder in the circumferential direction of the cylinder; the outer side of the mixing ring cavity communicates with a steam supplementing channel; the inner side of the mixing ring cavity communicates with the main steam flow channel through a flow guide ring cavity; the flow guide ring cavity inclines towards the main steam flow flowing direction of the main steam flow channel; a plurality of flow guide partition plates are arranged in the flow guide ring cavity in the circumferential direction of the flow guide ring cavity; and the flow guide ring cavity is divided into a plurality of sub-cavities by the plurality of flow guide partition plates. According to the invent