Method for modifying a compressor stator vane
View Patent ↗A vane unit system having a plurality of vane units having at least one airfoil projecting from a base is modified by placing a hole in the base and receiving a pin which extends between adjacent bases of vane units. A series of modified bases form a rigid ring of vanes that are less susceptible to vane motion caused by pressure fluctuations within the compressor of a gas turbine. A blade assembly tool having a shape to fit within the slit in a casing that receives the vane units allows for the installation of vane units with interlocking pins without the necessity of having to remove the rotor from the casing.
1. A method for modifying a set of compressor stator vane units having a base, said compressor having a casing with a slot receiving said base for an industrial gas turbine to avoid wear and reduce chatter, comprising:
forming a hole in a center portion of a face edge of the base of a vane unit;
inserting a pin into said hole; and
positioning a face edge of an adjacent unit towards said vane unit.
2. The method of claim 1 wherein positioning comprises inserting a contact block adjacent said adjacent unit.
3. The method of claim 2 wherein said inserting a contact block comprises sliding an assembly tool in said slot.
4. The method of claim 1 wherein said method further comprises connecting adjacent vane units.
5. The method of claim 4 wherein said connecting comprises coupling said adjacent vane to said base of said vane unit at said face edge.
6. The method of claim 5 wherein said coupling comprises inserting a projection on one said face edge into a cavity in the face edge on the adjacent vane unit.
7. The method of claim 4 including forming a hole in said face edge of said adjacent unit.
8. The method of claim 7 including positioning a shim adjacent said face edge of said vane unit before said positioning step.
9. A method for modifying a set of compressor stator vane units having a base, said compressor having a casing with a slot receiving said base for an industrial gas turbine to avoid wear and reduce chatter, comprising:
forming a hole in a center portion of a face edge of a base of a vane unit;
inserting a pin into said hole;
forming a hole in said face edge of said adjacent unit;
inserting the pin into said hole in said face edge of said adjacent unit;
positioning a face edge of an adjacent unit towards said vane unit; and
connecting adjacent vane units.