Compressor rotor, gas turbine rotor provided therewith, and gas turbine

A compressor rotor comprising:

• a compressor rotor shaft that rotates about an axial line and which has a plurality of rotor discs stacked in an axial direction;
• and
• a plurality of blade rows attached to an outer circumference of the compressor rotor shaft and aligned in the axial direction, wherein
• a ventilation flow path for guiding compressed gas flowing between two blade rows adjacent in the axial direction among the plurality of blade rows to an interior of the compressor rotor shaft is formed in the compressor rotor shaft,
• the ventilation flow path has
• an introduction part for guiding the compressed gas flowing between the two blade rows into the compressor rotor shaft,
• a plurality of branch parts which branch from the introduction part and are formed in mutually different positions in the axial direction, and into which the compressed gas flows from the introduction part, and
• a collection part which is connected to each of the plurality of branch parts, into which the compressed gas flows after passing through the plurality of branch parts, and through which the compressed gas that has flowed in flows outside,
• each of the plurality of branch parts has a cavity, and
• the introduction part comprises:
• an inflow part in which an inflow port into which the compressed gas flowing between the two blade rows flows among the plurality of the blade rows, and into which the compressed gas flowing between two other blade rows adjacent in the axial direction does not flow is formed, and which extends toward a radially inner side with respect to the axial line from the inflow port, and
• a distribution part which is located at a radially inner side of the inflow part,
• wherein
• the distribution part is formed between the inflow part and the plurality of the branch parts in the radial direction, and is connected to the plurality of the branch parts.