Rotor Shaft for a Machine, Connection Tube for a Rotor Shaft, and Machine Having Same

A rotor shaft for a machine having,

• an outer tube,
• an inner tube which is arranged coaxially in the outer tube, wherein an outer tube annular space is formed between an outer tube inner wall and an inner tube outer wall, and the inner tube has an inner tube wall opening,
• a hollow shaft journal, a first journal portion thereof projecting out of the outer tube, wherein a second journal portion of the shaft journal is arranged coaxially in the outer tube, is spaced apart from the inner tube along a longitudinal center axis of the rotor shaft and is connected sealingly and fixedly in terms of rotation to the outer tube inner wall and has a journal wall opening,
• a connection tube, a first connection tube end thereof bearing sealingly, at an outer circumferential side, against a shaft journal inner wall in the first journal portion, wherein the connection tube extends through the second journal portion, projects out of the second journal portion and, leads sealingly into the inner tube, wherein a shaft journal annular space that communicates with the outer tube annular space is formed between a connection tube outer wall and a shaft journal inner wall in the second journal portion.