Mechanical seal device

A mechanical seal device comprising:

• a seal case surrounding a rotary shaft of a rotary machine and separating a machine inner area and a machine outer area of the rotary machine from each other;
• at least one mechanical seal placed between the seal case and the rotary shaft;
• a sealing liquid chamber which is formed in the seal case and into which a sealing liquid for lubricating a sliding portion of the mechanical seal is introduced;
• and
• a circulation pump mechanism configured to circulate the sealing liquid in the sealing liquid chamber, wherein
• the circulation pump mechanism includes
• an annular rotor provided on a rotary shaft side so as to be integrally rotatable with the rotary shaft and having a mounting groove open at an outer circumferential surface thereof,
• a vane provided in the mounting groove and configured to freely project and retract with respect to the outer circumferential surface of the rotor,
• a spring provided on a deep side with respect to the vane in the mounting groove and configured to bias the vane in a direction in which the vane is caused to project from the outer circumferential surface of the rotor, and
• a retaining member provided on the deep side with respect to the vane in the mounting groove and having an insertion hole into which the spring is inserted.