| 摘要 |
A double mechanical seal device, comprising a rotating ring (30), a first static ring (41), a second static ring (51), and a seal cover (10). A first bellows seal device (100) is provided between the first static ring (40) and the seal cover (10), and the first bellows seal device (100) comprises a first bellows part (101) capable of expanding and contracting in an axial direction, a first cover-side adapter (102), and a first static ring-side adapter (103). The first bellows seal device (100) and the first static ring (41) are disposed so that in a state where there is no pressure difference between the inside and outside of the first bellows part, a balance line (BL) of the first bellows part (101) passes through a cross section of an O ring (45) and a first static seal surface (43). |
