SHAFT SEAL APPARATUS

摘要

A pumping ring 46 producing an axial flow of sealed flow is secured to a rotary shaft 6 at an axial position different from a rotary ring 56 so that the sealed fluid positioned in the sealed space 33 flows along the axial direction of the rotary shaft 6. A discharge hole 14 is formed on an inner circumferential surface of a seal cover 8 positioned in the downstream side of the axial flow of the sealed fluid resulting from a rotation of the pumping ring 46. An inflow hole 15 is formed in the upstream side of the axial flow of the sealed fluid resulting from the rotation of the pumping ring 46, so that the sealed fluid discharged from the discharge hole 14 returns to the inside of the sealed space from the inflow hole 15. On the inner circumferential surface of the seal cover 8 provided with the discharge hole 14, a baffle member 18 is provided so that it protrudes radially inward in order to block the flow of the sealed fluid along the rotating direction of a retainer 52 and orient the sealed fluid toward the discharge hole 14.

主权项

1. A shaft seal apparatus comprising:
a stationary ring secured to a stationary member; and a rotary ring secured to a rotational body that rotates with respect to said stationary member to rotate together with said rotational body, and having a rotational sliding surface that slides on a stationary sliding surface of said stationary ring, wherein said stationary member covers over said rotational body so that a sealed space of sealed fluid sealed by sliding of said stationary sliding surface and said rotational sliding surface is formed over said rotary ring, and a pumping ring producing an axial flow of said sealed fluid is secured to said rotational body at an axial position different from said rotary ring so that said sealed fluid positioned in said sealed space flows along the axial direction of said rotational body, a discharge hole is formed on an inner circumferential surface of said stationary member positioned in the downstream side of the axial flow of said sealed fluid resulting from a rotation of said pumping ring, and a baffle member is provided so that it protrudes radially inward in order to block the flow of said sealed fluid along the rotating direction of said rotational body and orient the sealed fluid toward said discharge hole.