Seal device, rotating machine, and method for mounting seal device
A seal device, includes: a seal member disposed between a rotating part and a stationary part of a rotating machine in a radial direction of the rotating machine; and a retention member for supporting the seal member movably along the radial direction, the retention member being at least partially accommodated in a groove disposed in the stationary part so as to extend along a circumferential direction. The retention member has: a base portion accommodated in the groove; and a protruding portion protruding radially inward from the base portion. The seal member has a sliding surface which is adjacent to the protruding portion in an axial direction and is slidable on the protruding portion.
1 . A seal device, comprising:
a seal member configured to be disposed between a rotating part and a stationary part of a rotating machine in a radial direction of the rotating machine; and
a retention member for supporting the seal member movably along the radial direction, the retention member being configured to be at least partially accommodated in a groove disposed in the stationary part so as to extend along a circumferential direction,
wherein the retention member has:
a base portion for accommodation in the groove; and
a protruding portion protruding radially inward from the base portion, and
wherein the seal member has a sliding surface which is adjacent to the protruding portion in an axial direction and is slidable on the protruding portion,
wherein the seal device comprises a biasing member accommodated in the retention member and configured to bias the seal member radially outward against the retention member along the radial direction,
wherein the retention member includes a contact portion configured to contact an axially protruding portion of the stationary part, the axially protruding potion protruding in the axial direction in the groove, and
wherein the biasing member is disposed radially outside of the contact portion.
2 . The seal device according to claim 1 , comprising:
a head part accommodated in the retention member; and
a shaft part extending along the radial direction and connecting the head part and the seal member,
wherein the biasing member is disposed between a radially inward-facing surface of the head part and a radially outward-facing surface of an inner wall surface of the retention member.
3 . The seal device according to claim 1 ,
wherein the seal member is disposed in the axial direction between a high-pressure portion of the rotating machine through which a high-pressure fluid flows and a low-pressure portion through which a low-pressure fluid with a lower pressure than the high-pressure fluid flows, and
wherein the protruding portion of the retention member is disposed in the axial direction closer to the low-pressure portion than the sliding surface of the seal member.
4 . The seal device according to claim 1 ,
wherein the seal member is disposed in the axial direction between a high-pressure portion of the rotating machine through which a high-pressure fluid flows and a low-pressure portion through which a low-pressure fluid with a lower pressure than the high-pressure fluid flows, and
wherein the seal member has an outer peripheral surface on which a pressure of the fluid from the high-pressure portion acts.
5 . The seal device according to claim 1 , comprising a friction reducing part, disposed on at least one of the sliding surface of the seal member or a facing surface of the protruding portion which faces the sliding surface and is slidable on the sliding surface, for reducing a friction between the sliding surface and the facing surface.
6 . A rotating machine, comprising:
the seal device according to claim 1 ;
the rotating part; and
the stationary part.
7 . A mounting method for mounting the seal device according to claim 1 on a rotating machine including the rotating part and the stationary part, comprising
a step of inserting the retention member in the groove disposed in the stationary part along a circumferential direction in a state where the seal member is assembled on the retention member so that the seal device is disposed between the rotating part and the stationary part in the radial direction.
8 . The seal device according to claim 2 , comprising a bolt part which includes the head part and the shaft part.
9 . The seal device according to claim 8 , wherein the head part is accommodated in the base portion so as to be movable in the radial direction.
10 . The seal device according to claim 2 , wherein the biasing member includes a disc spring through which the shaft part extends.