Axial-flow fluid machine and tip clearance measuring method therefor

Patent metadata

Field	Value
Publication number	US-11066957-B2
Application number	US-201816639212-A
Country	US
Kind code	B2
Filing date	Oct 16, 2018
Priority date	Oct 23, 2017
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

An axial-flow fluid machine provided with: a retainer ring holding a stationary blade train; a casing supporting the retainer ring; and an eccentric pin. An engagement part of the casing has a protruding section protruding to the retainer ring side. An engagement part of the retainer ring has a pair of wall plate sections forming a groove into which the protruding section is put. In the casing, a penetration hole is formed extending in a radial direction so as to be centered about a penetration center position that is biased to an axial upstream side in a region of the casing where the engagement part is formed. In the engagement part of the casing, a portion on an axial downstream side relative to the penetration hole exists in the entire circumferential area. The eccentric pin is inserted into the penetration hole.

First claim

The invention claimed is:

1. An axial-flow fluid machine comprising:
a rotor having a plurality of rotor blades disposed at an interval in a circumferential direction with respect to a rotor axis, and rotating around the rotor axis;
a stator blade row having a plurality of stator blades disposed at an interval in the circumferential direction at a position shifted from the plurality of rotor blades in an axial direction in which the rotor axis extends;
a cylindrical retainer ring that holds the stator blade row from a radially outer side with respect to the rotor axis; and
a cylindrical casing that supports the retainer ring from the radially outer side,
wherein the retainer ring and the casing have engaging portions which engage with each other,
wherein the engaging portion of one member out of the retainer ring and the casing has a projecting portion projecting to the other member side in a radial direction with respect to the rotor axis and extending in the circumferential direction,
wherein the engaging portion of the other member has a pair of wall plate portions projecting to the one member side in the radial direction, extending in the circumferential direction, facing each other in the axial direction, and forming a groove therebetween so that the projecting portion enters the groove,
wherein in the casing, a through-hole penetrating in the radial direction around a penetration center position biased to one side in the axial direction is formed inside a region where the engaging portion is formed in the casing in the axial direction,
wherein in the engaging portion of the casing, the other side portion in the axial direction with reference to the through-hole is present in an entire area in the circumferential direction, and
wherein a portion at the penetration center position in the circumferential direction on the one side in the axial direction with reference to the penetration center position does not have the engaging portion of the casing due to the through-hole.

2. The axial-flow fluid machine according to claim 1 ,
wherein the engaging portion of the casing has the projecting portion,
wherein the engaging portion of the retainer ring has the pair of wall plate portions,
wherein out of sides facing each other in the axial direction, a high-pressure side serving as a side on which a fluid flowing in the axial direction has higher pressure due to rotation of the rotor is the other side, and a low-pressure side opposite to the high-pressure side is the one side,
wherein the penetration center position is a position biased to the low-pressure side in the axial direction inside the region where the engaging portion is formed in the casing in the axial direction, and
wherein in the projecting portion of the casing, a portion on the high-pressure side in the axial direction with reference to the through-hole is present in the entire area in the circumferential direction.

3. The axial-flow fluid machine according to claim 1 ,
wherein the engaging portion of the casing has the pair of wall plate portions,
wherein the engaging portion of the retainer ring has the projecting portion,
wherein out of sides facing each other in the axial direction, a high-pressure side serving as a side on which a fluid flowing in the axial direction has higher pressure due to rotation of the rotor is the one side, and a low-pressure side opposite to the high-pressure side is the other side,
wherein the penetration center position is a position biased to the high-pressure side in the axial direction inside the region where the engaging portion is formed in the casing in the axial direction, and
wherein out of the pair of wall plate portions of the casing, the wall plate portion on the low-pressure side in the axial direction with reference to the through-hole is present in the entire area in the circumferential direction.

4. The axial-flow fluid machine according to claim 1 , wherein the casing has a plurality of the through-holes formed at an interval in the circumferential direction.

5. The axial-flow fluid machine according to claim 1 , further comprising:
a pin that is inserted into the through-hole,
wherein the through-hole is a columnar hole formed around the penetration center position,
wherein the pin has a columnar pin main body capable of being inserted into the through-hole and having an outer peripheral surface coming into contact with an inner peripheral surface of the through-hole, and an eccentric portion formed in an end of the pin main body in a pin extending direction in which a pin central axis of the pin main body extends, and
wherein the eccentric portion has a columnar shape formed around an eccentric axis parallel to the pin central axis and separated from the pin central axis, and an outer diameter of the eccentric portion is smaller than an outer diameter of the pin main body.

6. The axial-flow fluid machine according to claim 1 , further comprising:
a pin that is inserted into the through-hole,
wherein the pin has a tapered surface inclined with respect to a pin extending direction in which the pin extends, which is formed in an end portion of the pin in the pin extending direction.

7. The axial-flow fluid machine according to claim 6 , further comprising:
a lid that closes the through-hole from the radially outer side.

8. The axial-flow fluid machine according to claim 7 ,
wherein a length of the pin in the pin extending direction is a length that causes the pin to interfere with the lid when the pin is pushed into the through-hole and the lid closes the through-hole.

9. The axial-flow fluid machine according to claim 1 ,
wherein the casing is a compressor casing into which gas flows from an axially upstream side which is a first side in the axial direction, and which discharges the gas from an axially downstream side opposite to the axially upstream side, and
wherein the rotor is a compressor rotor that rotates around the rotor axis so as to compress the gas as the gas flows toward the axially downstream side.

10. The axial-flow fluid machine according to claim 1 ,
wherein the casing is a turbine casing into which gas flows from an axially upstream side which is a first side in the axial direction, and which exhausts the gas from an axially downstream side opposite to the axially upstream side, and
wherein the rotor is a turbine rotor to which a rotational force is applied by the gas flowing inside the turbine casing from the axially upstream side to the axially downstream side.

11. A tip clearance measuring method of measuring a tip clearance between a rotor blade and a stationary member present on a radially outer side of the rotor blade in an axial-flow fluid machine including
a rotor having a plurality of the rotor blades disposed at an interval in a circumferential direction with respect to a rotor axis, and rotating around the rotor axis,
a stator blade row having a plurality of stator blades disposed at an interval in the circumferential direction at a position shifted from the plurality of rotor blades in an axial direction in which the rotor axis extends,
a cylindrical retainer ring that holds the stator blade row from the radially outer side with respect to the rotor axis, and
a cylindrical casing that supports the retainer ring from the radially outer side, in which the retainer ring and the casing have engaging portions which engage with each other, in which the engaging portion of one member out of the retainer ring and the casing has a projecting portion projecting to the other member side in a radial direction with respect to the rotor axis and extending in the circumferential direction, and in which the engaging portion of

Assignees

• Mitsubishi Hitachi Power Sys
• Mitsubishi Power Ltd

Inventors

• TSUBOKURA Ikko
• Morimoto Hitoshi
• Takahashi Koichi
• IKUSHIMA Kazuhiro
• KOMUKAI Takuya
• Iwasaki Motohiro

Classifications

• F05D2230/64

  using positioning or alignment devices for aligning or centring, e.g. pins · CPC title

• F01D11/22 Primary

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

• G01M15/14

  Testing gas-turbine engines or jet-propulsion engines · CPC title

• F01D25/285

  Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures · CPC title

• F04D19/02

  Multi-stage pumps · CPC title