Sole plate for turbine and power generating plant equipment
View Patent ↗A sole plate in use for turbine capable of realizing a smooth sliding on a gland pad used in the mounting portion of power generating plant equipment, effectively suppressing a variation in the alignment of a rotating shaft by a reaction due to thermal expansion and the thrust of a gas turbine, and eliminating a regular maintenance such as filing of lubricating oil, and disposed between the gland pad installed on a base and a turbine support part, comprising a sole plate body made of a metal material disposed on the turbine support part sole and a sliding member made of a material with self-lubricity formed on the surface of the sole plate body on the gland pad side.
1. A sole plate in use for turbine to be positioned between a gland pad installed on a base and a turbine support, comprising:
a sole plate body made of a metal material disposed on the turbine support side; and
a sliding member made of a material with self-lubricity formed on the surface of the sole plate body on the gland pad side,
wherein the compression elastic deformation (Δt) of said material with self-lubricity is less than 0.1;
wherein
Δ t=ε×t , and
ε=σ/ E
wherein
Δt: compression elastic deformation (mm),
t: thickness of the sliding member (mm),
ε: strain,
σ: loaded pressure (MPa), and
E: compression elastic modulus of said material with self-lubricity.
2. The sole plate in use for turbine as set forth in claim 1 , wherein said material with self-lubricity has a friction coefficient between the sliding member and the gland pad of less than 0.30.
3. The sole plate in use for turbine as set forth in claim 1 , wherein said material with self-lubricity is an organic material, an inorganic material, or a combination thereof.
4. The sole plate in use for turbine as set forth in claim 3 , wherein said organic material comprises one species selected from a low friction coefficient resin material made of ethylene tetrafluoride, ethylene tetrafluoride perfluoro alkoxy ethylene, polyether ketone or polyimido and the mixture of such low friction coefficient resin material.
5. The sole plate in use for turbine as set forth in claim 3 , wherein said inorganic material comprises at least one species selected from a group consisting of carbon, graphite, MoS 2 , BN, SiC, TiC, AlN and TiN.
6. The sole plate in use for turbine as set forth in claim 3 , wherein said inorganic material comprises metal material selected from copper or copper alloy.
7. The sole plate in use for turbine as set forth in claim 1 , wherein the pressure elastic modulus (E) of the self-lubricity material is more than 500 MPa.
8. The sole plate in use for turbine as set forth in claim 1 , wherein said material having self-lubricity contains a reinforcing filler material.
9. The sole plate in use for turbine as set forth in claim 8 , wherein the content of the reinforcing filler material in the material having self-lubricity ranges from 5 wt % to 50 wt %.
10. The sole plate in use for turbine as set forth in claim 8 , wherein said reinforcing filler material comprises at least one species selected from the group consisting of a glass fiber material, a carbon fiber material, a graphite material, a ceramic fiber material, or particulate material thereof.
11. The sole plate in use for turbine as set forth in claim 1 , wherein a porous layer is formed on a surface of the gland pad of the sole plate body, and said material having self-lubricity is applied on the surface of said porous layer and then at least one part of said material having self-lubricity is filled within said porous layer.
12. A power generating plant equipment having a gland pad installed on a base and a turbine mounted on said gland pad by means of a sole plate positioned on the gland pad,
wherein the sole plate is as set forth in claim 1 .