Seal structure
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsYuichi Hirakawa, Hidekazu Uehara, Takashi Nakano, Shin Nishimoto
Life of this patent
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Abstract
A seal structure includes a thick abradable film, thereby improving sealing performance. A seal structure (1) is provided with at least one fin (5) that projects in a ring-shape from a circumferential surface of a rotating shaft (3) and that is provided along an axial direction (L) and a seal member (9) having a ring-shaped sealing surface (19) opposed to the fin (5), and on which an abradable layer (25) is formed by thermally spraying abradable material onto the sealing surface (19), the seal structure (1) is provided with tapered portions (21) inclined in a radial direction (K) at end portions of the sealing surface (19) in the axial direction (L).
Claims7
A seal structure comprising:
- a plurality of fins that project in a ring-shape from a circumferential surface of a rotating member;
- a seal member having a ring-shaped sealing surface opposed to the fins;
- and
- an abradable film formed on the seal member by thermally spraying abradable material onto the sealing surface;
- wherein the seal member includes an inclined portion at an end portion of the sealing surface in an axial direction of the seal member, the inclined portion being inclined in a radial direction of the seal member,
- wherein a film thickness of the abradable film on the inclined portion is thinner than a film thickness at other portions of the seal member,
- wherein the seal member includes recesses and ridged portions extending in a circumferential direction of the seal member and spaced apart in the axial direction of the seal member,
- wherein the fins engage the recesses and the ridges, and
- wherein each ridged portion has a sealing surface and a tapered portion disposed on each side of the sealing surface in the axial direction of the seal member, each tapered portion is inclined in the radial direction of the seal member, and a film thickness of the abradable film on the tapered portions is thinner than a film thickness on the sealing surface.
Dependencies are inferred from the claim text.