US 12,435,792 B2
Mechanical seal device
Masaya Nakatsuka, Osaka (JP); Masashi Hayashi, Osaka (JP); and Shigeyuki Fujinaga, Osaka (JP)
Assigned to PILLAR CORPORATION, Osaka (JP)
Appl. No. 18/860,873
Filed by PILLAR CORPORATION, Osaka (JP)
PCT Filed Jan. 10, 2023, PCT No. PCT/JP2023/000283
§ 371(c)(1), (2) Date Oct. 28, 2024,
PCT Pub. No. WO2023/243126, PCT Pub. Date Dec. 21, 2023.
Claims priority of application No. 2022-096969 (JP), filed on Jun. 16, 2022.
Prior Publication US 2025/0290566 A1, Sep. 18, 2025
Int. Cl. F16J 15/34 (2006.01)
CPC F16J 15/3404 (2013.01) [F16J 15/3484 (2013.01)] 6 Claims
OG exemplary drawing
 
1. 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.