Apparatus for adjusting clearance and gas turbine including the same

Patent metadata

Field	Value
Publication number	US-11242765-B2
Application number	US-202016895241-A
Country	US
Kind code	B2
Filing date	Jun 8, 2020
Priority date	Aug 8, 2019
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A clearance adjusting apparatus disposed in front of a compressor of a gas turbine to axially move a compressor disk back and forth to adjust a tip clearance formed between a compressor blade and a compressor casing is provided. The clearance adjusting apparatus includes a hollow fastening part disposed in front of the compressor casing, a shaft disposed in the fastening part and coupled to a front side of the compressor disk, an adjusting part disposed between the fastening part and the shaft to axially move the shaft back and forth to adjust the tip clearance, and a biasing part disposed on the fastening part to bias the adjusting part back and forth to adjust a position of the adjusting part and the shaft.

First claim

What is claimed is:

1. A clearance adjusting apparatus disposed in front of a compressor of a gas turbine to axially move a compressor disk back and forth to adjust a tip clearance of the compressor, the clearance adjusting apparatus comprising:
a hollow fastening part disposed in front of a compressor casing;
a shaft disposed in the fastening part and coupled to a front side of a compressor disk;
an adjusting part disposed between the fastening part and the shaft to axially move the shaft back and forth to adjust the tip clearance; and
a biasing part disposed on the fastening part to bias the adjusting part back and forth to adjust a position of the adjusting part and the shaft,
wherein a protruding member is formed to protrude radially inward from an inner circumferential surface of a front side of the compressor casing, wherein the fastening part comprises:
a fastening housing installed around an outer circumferential surface of the adjusting part;
a fastening member disposed on a rear end of the fastening housing to be fixed to the protruding member; and
a fastening step disposed on an inner circumferential surface of the fastening housing,
wherein the biasing part is disposed on the fastening step to bias the adjusting part back and forth so that the adjusting part and the shaft are moved back and forth.

2. The clearance adjusting apparatus according to claim 1 , wherein
a gap is formed between the protruding member and the compressor disk in an axial direction of the compressor disk, and
the biasing part is configured to adjust a position of the adjusting part and the shaft by biasing the adjusting part rearward if the gap is less than a preset reference range and biasing the adjusting part forward if the gap exceeds the preset reference range.

3. The clearance adjusting apparatus according to claim 1 , wherein
the fastening step includes a pair of fastening step portions spaced apart back and forth from each other,
the adjusting part is disposed between the pair of fastening step portions, and
the biasing part includes a pair of biasing members disposed to penetrate through the pair of fastening step portions from an outside toward an inside of the pair of the fastening step portions, respectively, in an axial direction thereof to bias and move the adjusting part forward or rearward.

4. The clearance adjusting apparatus according to claim 3 , wherein
the pair of biasing members are disposed to be movable back and forth with respect to the pair of fastening step portions, respectively, such that respective distal ends thereof comes into contact with front and rear surfaces of the adjusting part, and
if one of the biasing members is moved toward and biases the adjusting part, the other biasing member is moved away from the adjusting part.

5. The clearance adjusting apparatus according to claim 4 , wherein
each of the pair of fastening step portions includes through-holes having a threaded portion on an inner wall thereof such that the pair of biasing members penetrate therethrough, and
the pair of biasing members include a threaded portion to be meshed with the threaded portion of the through-hole on an outer circumferential surface thereof, so that the pair of biasing members rotate and move back and forth through the pair of fastening step portions, respectively.

6. The clearance adjusting apparatus according to claim 3 , wherein
the adjusting part includes a pair of insertion holes into which distal ends of the pair of biasing members are respectively inserted, and a threaded portion is formed on an inner wall of the through-hole, and
the pair of biasing members which are rotatable at a fixed position with respect to the pair of fastening step portions include a threaded portion corresponding to the threaded portion of the pair of the insertion holes on an outer circumferential surface of the distal end side thereof, such that if one of the biasing members is screwed into one of the insertion holes, the other biasing member is unscrewed out of the other insertion hole.

7. The clearance adjusting apparatus according to claim 3 , wherein
the pair of fastening step portions include a first fastening step portion disposed on a rear side of an axial thrust direction based on the adjusting part and a second fastening step portion disposed on a front side of the thrust direction based on the adj us ting part, the adj us ting part being subjected to an axial thrust with a fluid flowing through the gas turbine, and
the pair of biasing members include a first biasing member attached to the first fastening step portion and a second biasing member attached to the second fastening step portion,
wherein the biasing part further includes a washer member fitted around the first biasing member between the adjusting part and the first fastening step portion.

8. The clearance adjusting apparatus according to claim 7 , wherein
the adjusting part includes an insertion hole into which a distal end of the first biasing member is inserted, and a threaded portion is formed on an inner wall of the through-hole,
the first biasing member which is rotatable at a fixed position with respect
to the first fastening step portion includes a threaded portion corresponding to the threaded portion of the insertion hole on an outer circumferential surface of the distal end side thereof,
the second biasing member is movable back and forth with respect to the second fastening step portion such that a distal end thereof is arranged to contact the adjusting part, and
if the second biasing member is moved toward and biases the adjusting part, the first biasing member is screwed into the insertion hole, and if the second biasing member is moved away from the adjusting part, the first biasing member is unscrewed out of the insertion hole.

9. A clearance adjusting apparatus disposed in front of a compressor of a gas turbine to axially move a compressor disk back and forth to adjust a tip clearance of the compressor, the clearance adjusting apparatus comprising:
a hollow fastening part disposed in front of a compressor casing;
a shaft disposed in the fastening part and coupled to a front side of a compressor disk;
an adjusting part disposed between the fastening part and the shaft to axially move the shaft back and forth to adjust the tip clearance; and
a biasing part disposed on the fastening part to bias the adjusting part back and forth to adjust a position of the adjusting part and the shaft,
wherein a protruding member is formed to protrude radially inward from an inner circumferential surface of a front side of the compressor casing, wherein the fastening part comprises:
a fastening housing installed around an outer circumferential surface of the adjusting part;
a fastening member disposed on a rear end of the fastening housing to be fixed to the protruding member; and
a fastening step disposed on an inner circumferential surface of the fastening housing,
wherein the biasing part is disposed on the fastening step to bias the adjusting part back and forth so that the adjusting part and the shaft are moved back and forth,
wherein the fastening part further includes a reinforcing housing disposed between the fastening housing and the adjusting part, and a reinforcing protrusion protruding from an outer circumferential surface of the reinforcing housing to be inserted into an inner circumferential surface of the fastening housing, and
the fastening step is formed to protrude from an inner circumferential surface of the reinforcing housing.

10. A gas turbine comprising:
a compressor including a compressor casing along which an externally introduced au flows, a compressor stator coupled to an inner circ

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Kim Yeong Chun

Classifications

• F05D2260/31

  Retaining bolts or nuts · CPC title

• F04D29/0513

  hydrostatic; hydrodynamic thrust bearings · CPC title

• F01D11/22 Primary

  by mechanically actuating the stator or rotor components, e.g. moving shroud sections relative to the rotor · CPC title

• F01D25/162

  Bearing supports · CPC title

• F01D25/168

  for axial load mainly · CPC title