Sliding component
A sliding component having an annular shape is disposed in a place where relative rotation is performed in a rotary machine, in which a plurality of dynamic pressure generating mechanisms are provided in a sliding surface of the sliding component, each including a deep groove portion that communicates with an outer diameter side, and at least one shallow groove portion that communicates with the deep groove portion and extends in a circumferential direction, and the deep groove portion is provided with a trap portion that suppresses a sealed liquid in the deep groove portion from leaking to a leakage side.
1. A sliding component that has an annular shape and is disposed in a place where relative rotation is performed in a rotary machine, comprising a plurality of dynamic pressure generating mechanisms,
wherein the plurality of dynamic pressure generating mechanisms are provided in a sliding surface of the sliding component, each of the dynamic pressure generating mechanisms including a deep groove portion that communicates with an outer diameter side or an inner diameter side, and at least one shallow groove portion that communicates with the deep groove portion and extends in a circumferential direction, the shallow groove portion is shallower than the deep groove portion,
the deep groove portion is provided with a trap portion that suppresses leakage of a sealed fluid in the deep groove portion,
the deep groove portion is defined by a pair of side wall surfaces opposed to each other in the circumferential direction, and
the trap portion has at least one protruded trap piece which is formed in a quadrilateral shape in a plan view and protruded in a radial direction from one of the side wall surfaces of the deep groove portion.
2. The sliding component according to claim 1 , wherein
the at least one protruded trap piece includes a pair of side wall surfaces parallel to the circumferential direction.
3. The sliding component according to claim 2 , wherein
the at least one protruded trap piece further includes an end wall surface which is continuous to and between the side wall surfaces of the protruded trap piece, and
the end wall surface of the protruded trap piece is parallel to the radial direction.
4. The sliding component according to claim 1 , wherein
the at least one trap portion further has at least one isolated trap piece which is inside the deep groove portion and isolated from the protruded trap piece.
5. The sliding component according to claim 1 , wherein
the at least one protruded trap pieces are arranged on both sides of the deep groove in the circumferential direction, and
the isolated trap pieces are shifted from the protruded trap pieces in the radial direction.
6. The sliding component according to claim 5 , wherein
the at least one protruded trap pieces and the isolated trap pieces are symmetrically disposed with respect to an imaginary center line of the deep groove portion parallel to the radial direction in a plan view.
7. The sliding component according to claim 1 , wherein
the deep groove portion communicates with the outer diameter side.
8. The sliding component according to claim 1 , wherein
the deep groove portion communicates with a leakage side.
9. A sliding component that has an annular shape and is disposed in a place where relative rotation is performed in a rotary machine, comprising a plurality of dynamic pressure generating mechanisms,
wherein the plurality of dynamic pressure generating mechanisms are provided in a sliding surface of the sliding component, each of the dynamic pressure generating mechanisms including a deep groove portion and at least one shallow groove portion that extends in a circumferential direction, the shallow groove portion is shallower than the deep groove portion,
the deep groove portion is provided with a trap portion that suppresses leakage of a sealed fluid in the deep groove portion,
the deep groove portion has a wide groove part and a narrow groove part,
the wide groove part of the deep groove portion is wider than the narrow groove part in the circumferential direction,
the wide groove part of the deep groove portion communicates with the shallow groove portion,
the narrow groove part of the deep groove portion communicates with an outer diameter side or an inner diameter side of the sliding component,
the wide groove part of the deep groove portion is defined by a pair of side wall surfaces opposed to each other in the circumferential direction,
part of the pair of side wall surfaces extends from a bottom surface of the wide groove part to the sliding surface, and
the trap portion is formed by a land portion which defines the narrow groove part of the deep groove portion.
10. The sliding component according to claim 9 , wherein
the pair of side wall surfaces defining the wide groove part of the deep groove portion is a pair of first side wall surfaces
the narrow groove part of the deep groove portion is defined by a pair of second side wall surfaces opposed to each other in the circumferential direction,
the deep groove portion is partially defined by a pair of third side wall surfaces connecting the first side wall surfaces to the second side wall surfaces.
11. The sliding component according to claim 10 , wherein
the first side wall surfaces and the second side wall surfaces are parallel to a radial direction, and
the third side wall surfaces are parallel to the circumferential direction.
12. The sliding component according to claim 9 , wherein
the deep groove portion communicates with the outer diameter side.
13. The sliding component according to claim 9 , wherein
the deep groove portion communicates with a leakage side.
14. A sliding component that has an annular shape and is disposed in a place where relative rotation is performed in a rotary machine, comprising a plurality of dynamic pressure generating mechanisms,
wherein the plurality of dynamic pressure generating mechanisms are provided in a sliding surface of the sliding component, each of the dynamic pressure generating mechanisms including a deep groove portion that communicates with an outer diameter side or an inner diameter side, and at least one shallow groove portion that communicates with the deep groove portion and extends in a circumferential direction, the shallow groove portion is shallower than the deep groove portion,
the deep groove portion is provided with a trap portion that suppresses leakage of a sealed fluid in the deep groove portion,
the trap portion has at least four trap pieces which are continuously formed in a radial direction,
each of the trap pieces is formed in a triangle shape in a plan view,
each of the trap pieces is defined by a first side wall surface which extends from a side wall surface of the deep groove portion toward a center of circumferential width of the deep groove portion, a second side wall surface which is disposed on a leakage side with respect to the first side wall surface, and a connecting surface which extends in parallel to the sliding surface and connects the first side wall surface and the second side wall surface, and
at least part of the connecting surface is flush with a bottom surface of the shallow groove portion, wherein
at least two of the at least four trap pieces are disposed facing one another, and at least two other of the at least four trap pieces are radially spaced apart from one another.
15. The sliding component according to claim 14 , wherein
the first side wall surface of each of the trap pieces is parallel to the circumferential direction,
the second side wall surface of each of the trap pieces is inclined with respect to the circumferential direction, and
the connecting surface partially defining each of the trap pieces is formed in a triangle shape.
16. The sliding component according to claim 14 , wherein
the trap pieces are arranged throughout from the outer diameter side of the deep groove portion and to the inner diameter side of the deep groove portion.
17. The sliding component according to claim 14 , wherein
the trap pieces are arranged both sides of the deep groove portion in the circumferential direction.
18. The sliding component according to claim 17 , wherein
the trap pieces are symmetrically disposed with respect to an imaginary center line of the deep groove portion parallel to the radial direction in a plan view.
19. The sliding component according to claim 14 ,
wherein the deep groove portion communicates with the outer diameter side.
20. The sliding component according to claim 14 ,
wherein the deep groove portion communicates with a leakage side.