Vane angle measurement device and vane angle measurement method using same

A vane angle measurement device capable of measuring a rotation angle of a variable stator vane in an axial flow fluid machine including

• a rotor that is rotatable about a rotor axis,
• a casing that covers an outer periphery of the rotor,
• a plurality of stator vanes that are disposed inside the casing and attached to the casing,
• an angle changing mechanism that is capable of rotating a variable stator vane, which is a part of the plurality of stator vanes, around a vane rotational axis extending in a radial direction with respect to the rotor axis, and
• an inner cylindrical member disposed on a radially inner side of the variable stator vane with respect to the rotor axis and having an annular shape about the rotor axis,
• in which among a plurality of members constituting the angle changing mechanism, the inner cylindrical member, and the variable stator vane, a first member has an arm contact surface which is one of a variable surface that rotates around the vane rotational axis with the rotation of the variable stator vane and an angle reference surface perpendicular to the rotor axis, and
• among the plurality of members constituting the angle changing mechanism, the inner cylindrical member, and the variable stator vane, a second member has a first leg contact surface which is the other of the variable surface and the angle reference surface, and a second leg contact surface which extends in a direction intersecting the first leg contact surface and faces a radially outer side with respect to the rotor axis, the vane angle measurement device comprising:
• a goniometer including a measurement arm capable of coming into contact with the arm contact surface of the first member, and a goniometer body that supports the measurement arm to be rotatable around a measurement central axis and is capable of measuring a rotation angle of the measurement arm;
• and
• a stand that supports the goniometer and is capable of coming into contact with the second member,
• wherein the stand includes a substrate to which the goniometer body is attached, and a plurality of legs attached to the substrate and extending in a direction having a component in a measurement central axis direction along which the measurement central axis extends,
• a first leg of the plurality of legs includes a device reference surface that is capable of coming into contact with the first leg contact surface of the second member, and an arm height securing surface that is capable of coming into contact with the second leg contact surface when the device reference surface is in contact with the first leg contact surface, and
• a second leg of the plurality of legs has a second contact end that is capable of coming into contact with the second leg contact surface at a position spaced apart from the arm height securing surface of the first leg when the device reference surface is in contact with the first leg contact surface and the arm height securing surface is in contact with the second leg contact surface, and is a leg that is capable of changing a length from the substrate to the second contact end to adjust an inclination of the substrate such that the measurement central axis is parallel to the vane rotational axis.