Rotor blade removal device and rotor blade removal method

Abstract

To remove a moving blade from a disk without opening a casing.SOLUTION: A rotor blade removal device for removing a rotor blade from a disk includes a hook capable of coming into contact with the rotor blade, and a pull-out portion connected to the hook and configured to move the hook in a pull-out direction from a second end surface of the disk toward a first end surface of the disk. The pull-out portion is connected to the arm at a position opposite to the contact portion in the pull-out direction, and can apply a load to the hook in the pull-out direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a blade removal apparatus and a blade removal method. [Background technology]

[0002] An axial flow compressor, which is a type of axial flow rotary machine, includes a rotor that rotates about an axis and a casing that covers the rotor. The rotor has a rotor shaft and a plurality of rows of rotor blades attached to the rotor shaft. Each row of rotor blades is aligned in the axial direction along which the axis extends. Each row of rotor blades includes a disk and a plurality of rotor blades aligned circumferentially about the axis on the outer circumferential surface of the disk.

[0003] The following Patent Document 1 discloses an axial compressor. The rotor shaft of this axial compressor has a disk for each of multiple rows of rotor blades. Each of the multiple disks is circular and centered on the axis. The rotor shaft is configured by stacking multiple disks in the axial direction. Each disk has an outer peripheral surface, a leading end surface, a trailing end surface, and multiple blade root grooves. The leading end surface extends radially inward from the axially upstream edge of the outer peripheral surface relative to the axis. The trailing end surface extends radially inward from the axially downstream edge of the outer peripheral surface. Each of the multiple blade root grooves is recessed radially inward from the outer peripheral surface and extends from the trailing end surface in a twisting direction relative to the axial direction, penetrating all the way to the leading end surface. Each of the multiple rotor blades has a blade body extending radially and a blade root provided radially inward of the blade body and fitted into the blade root groove.

[0004] Patent Document 1 also discloses a blade removal device for removing blades attached to a disk. This blade removal device has a push-out mechanism and a frame to which the push-out mechanism is attached. The frame has two bases and a base connecting portion. The push-out mechanism and the base connecting portion are arranged on the axial downstream side of the blades. The two bases are arranged so that one blade is located between the two bases. In this state, the push-out mechanism can contact the one blade located between the two bases from the axial downstream side. In the blade removal device of Patent Document 1, an operator drives the push-out mechanism to push and move the blade axially upstream. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-181354 Summary of the Invention [Problem to be solved by the invention]

[0006] The blade removal device described in Patent Document 1 requires a push-out mechanism to be located downstream of the disk in the axial direction. Furthermore, the push-out mechanism is lowered vertically from above. Therefore, it is necessary to remove and open the upper half of the casing of the axial flow rotating machine, which means opening the casing of the axial flow compressor. Opening the casing has significant impacts, such as increasing the number of steps in the inspection process, and therefore there is a need for a technology that shortens the inspection process by not opening the casing.

[0007] Therefore, an object of the present disclosure is to provide a blade removal device and a blade removal method that are capable of removing blades from a disk without opening the casing. [Means for solving the problem]

[0008] In order to solve the above problems, a rotor blade removal device according to the present disclosure is a rotor blade removal device for removing a rotor blade from a disk, the disk having an outer peripheral surface extending in a circumferential direction about an axis, a first end face facing a first axis side among both sides in the axial direction in which the axis extends, a second end face facing a second axis side opposite to the first axis side, and a blade root groove, the blade root groove being recessed radially inward from the outer peripheral surface in a radial direction relative to the axis and penetrating from the second end face to the first end face, the rotor blade having an airfoil-shaped cross section perpendicular to the radial direction and being provided radially inward of the airfoil, and a blade root fitted in the blade root groove in a state where the blade root is inserted from a first axial side toward the second axial side, the blade removal device comprises a hook capable of contacting the blade, and a withdrawal part connected to the hook and moving the hook in a withdrawal direction from the second end face toward the first end face, the hook having a contact part capable of contacting the blade from the second axial side in the axial direction, and an arm extending from the contact part in the withdrawal direction, the withdrawal part being connected to the arm at a position opposite to the contact part in the withdrawal direction, and capable of applying a load to the hook in the withdrawal direction.

[0009] A blade removal method according to the present disclosure is a blade removal method for removing a blade from a disk, the disk having an outer peripheral surface extending in a circumferential direction about an axis, a first end face facing a first axis side among both sides in the axial direction in which the axis extends, a second end face facing a second axis side opposite to the first axis side, and a blade root groove, the blade root groove being recessed radially inward from the outer peripheral surface in a radial direction relative to the axis and penetrating from the second end face to the first end face, the blade having an airfoil-shaped cross section perpendicular to the radial direction and comprising a blade body extending in the radial direction, and a blade root provided radially inward of the blade body and fitted into the blade root groove in a state inserted from the first axis side toward the second axis side, the blade removal method including the steps of: preparing a blade removal device; the blade removal device prepared in the preparation step includes a hook capable of contacting the blade, and a withdrawal unit connected to the hook and configured to move the hook in a withdrawal direction from the second end face toward the first end face, the hook having a contact portion capable of contacting the blade from the second axis side in the axial direction, and an arm extending from the contact portion in the withdrawal direction, the withdrawal portion being connected to the arm at a position opposite to the contact portion in the withdrawal direction and configured to apply a load to the hook in the withdrawal direction, the device arrangement step including bringing the hook into contact with the blade from the second axis side in the axial direction and arranging the withdrawal portion on the first axis side relative to the blade, and the blade movement step including applying the load to the withdrawal portion to move the blade in the withdrawal direction. [Effects of the Invention]

[0010] According to the rotor blade removal device and rotor blade removal method of the present disclosure, the rotor blade can be removed from the disk without opening the casing. [Brief explanation of the drawings]

[0011] [Figure 1]1 is a schematic cross-sectional view of a gas turbine according to an embodiment of the present disclosure; [Figure 2] FIG. 2 is a detailed view of the rotor blade in part II in FIG. [Figure 3] 3 is a view taken along the arrow III in FIG. 2. [Figure 4] FIG. 2 is a perspective view of a main portion of a rotor according to an embodiment of the present disclosure. [Figure 5] FIG. 2 is a plan view of the blade removal device according to the first embodiment of the present disclosure. [Figure 6] 3 is a flowchart showing the steps of a blade removal method according to the first embodiment of the present disclosure. [Figure 7] FIG. 2 is a plan view of a main portion of the rotor and the blade removal device after an apparatus placement step according to the first embodiment of the present disclosure. [Figure 8] FIG. 4 is a plan view of a blade removal device according to a second embodiment of the present disclosure. [Figure 9] 10 is a flowchart showing the steps of a blade removal method according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0013] <Axial flow rotating machine> First, an axial flow rotary machine to which the rotor blade removal device and rotor blade removal method are applied will be described with reference to FIGS.

[0014] The axial flow rotary machine to which the blade removal device and blade removal method are applied is the compressor of a gas turbine. As shown in Figure 1, the gas turbine 1 includes a compressor 30 that compresses air A, a combustor 20 that burns fuel F in the air A compressed by the compressor 30 to generate combustion gas, and a turbine 10 that is driven by the combustion gas.

[0015] The compressor 30 has a compressor rotor 31 that rotates about an axis Ar, a compressor casing 35 that covers the compressor rotor 31, and multiple stator blade rows 37. The turbine 10 has a turbine rotor 11 that rotates about the axis Ar, a turbine casing 15 that covers the turbine rotor 11, and multiple stator blade rows 17. Here, the direction in which the axis Ar extends is referred to as the axial direction Da, the circumferential direction about the axis Ar is simply referred to as the circumferential direction Dc, and the direction perpendicular to the axis Ar is referred to as the radial direction Dr. Furthermore, of both sides of the axial direction Da, one side is referred to as the first axial side Dau (axial upstream side), and the opposite side is referred to as the second axial side Dad (axial downstream side). Furthermore, the side of the radial direction Dr that is closer to the axis Ar is referred to as the radially inner side Dri, and the opposite side is referred to as the radially outer side Dro.

[0016] The compressor 30 is arranged on the axial upstream side Dau of the turbine 10. The compressor rotor 31 and the turbine rotor 11 are located on the same axis Ar and are connected to each other to form a gas turbine rotor 2. To this gas turbine rotor 2, for example, a rotor of a generator GEN is connected. The gas turbine 1 further includes an intermediate casing 6. This intermediate casing 6 is arranged between the compressor casing 35 and the turbine casing 15 in the axial direction Da.

[0017] The combustor 20 is attached to the intermediate casing 6. The compressor casing 35, the intermediate casing 6 and the turbine casing 15 are connected to one another to form the gas turbine casing 5.

[0018] The turbine rotor 11 has a rotor shaft 12 that extends in an axial direction Da about an axis Ar, and a plurality of rotor blade rows 13 attached to the rotor shaft 12. The plurality of rotor blade rows 13 are aligned in the axial direction Da. Each rotor blade row 13 is made up of a plurality of rotor blades aligned in a circumferential direction Dc. One of a plurality of stator blade rows 17 is arranged on the axial upstream side Dau of each of the plurality of rotor blade rows 13. Each stator blade row 17 is provided inside a turbine casing 15. Each stator blade row 17 is made up of a plurality of stator blades aligned in the circumferential direction Dc.

[0019] The compressor rotor 31 has a rotor shaft 32 extending in the axial direction Da around the axis Ar, and a plurality of rotor blade rows 33 attached to the rotor shaft 32. The plurality of rotor blade rows 33 are aligned in the axial direction Da. Each rotor blade row 33 is made up of a plurality of rotor blades aligned in the circumferential direction Dc. One of a plurality of stator blade rows 37 is arranged on the axial downstream side Dad of each of the plurality of rotor blade rows 33. Each stator blade row 37 is provided inside the compressor casing 35. Each stator blade row 37 is made up of a plurality of stator blades aligned in the circumferential direction Dc.

[0020] The rotor shaft 32 of the compressor 30 has a disk 40 for each of the plurality of rotor blade rows 33. As shown in Figures 2 and 3, each of the plurality of disks 40 has a circular plate shape centered on the axis Ar. The rotor shaft 32 is configured by stacking the plurality of disks 40 in the axial direction Da. Each of the plurality of rotor blades 50 constituting the rotor blade row 33 extends in the radial direction Dr and has a blade body 51 whose cross section perpendicular to the radial direction Dr forms an airfoil shape, and a blade root 52 provided on the radially inner side Dri of the blade body 51.

[0021] The blade body 51 has a blade surface 51s connected by a leading edge 51f and a trailing edge 51b. The leading edge 51f is the outer edge of the blade body 51 located at the most upstream side Dau in the axial direction Da of the blade body 51. The trailing edge 51b is the outer edge of the blade body 51 located at the most downstream side Dad in the axial direction Da of the blade body 51. Both the leading edge 51f and the trailing edge 51b extend in the radial direction Dr.

[0022] The blade root 52 has a blade root leading end surface 53f facing the axial upstream side Dau, a blade root trailing end surface 53b facing the axial downstream side Dad, and a blade root side surface 54 connected by the blade root leading end surface 53f and the blade root trailing end surface 53b. 2 and 3 illustrate the first stage blade row 33f that is the most axially upstream side Dau among the multiple blade rows 33, the first stage disk 40f to which this first stage blade row 33f is attached, the second stage blade row 33s that is adjacent to the first stage blade row 33f on the axial downstream side Dad, and the second stage disk 40s to which this second stage blade row 33s is attached.

[0023] The disk-shaped disk 40 has a disk-shaped body portion 41 centered on the axis Ar and a blade attachment portion 43 formed on the outer periphery of the body portion 41. The body portion 41 has an inner leading end surface 42f facing the axial upstream side Dau and an inner trailing end surface 42b facing the axial downstream side Dad. The inner trailing end surface 42b is back-to-back with the inner leading end surface 42f. The inner trailing end surface 42b of one disk 40 is in contact with the inner leading end surface 42f of another disk 40 adjacent to the disk 40 on the axial downstream side Dad. The blade attachment portion 43 has an outer peripheral surface 44 centered on the axis Ar and extending in the circumferential direction Dc, a first end surface 45f (outer leading end surface) facing the axial upstream side Dau, a second end surface 45b (outer trailing end surface) facing the axial downstream side Dad, and a blade root groove 46. The outer front end surface 45f extends radially inwardly Dri from an edge of the outer peripheral surface 44 on the axial upstream side Dau. The outer front end surface 45f is located on the axial downstream side Dad of the inner front end surface 42f. The outer rear end surface 45b extends radially inwardly Dri from an edge of the outer peripheral surface 44 on the axial downstream side Dad. The outer rear end surface 45b is located on the axial upstream side Dau of the inner rear end surface 42b. Therefore, the distance between the outer front end surface 45f and the outer rear end surface 45b in the axial direction Da is shorter than the distance between the inner front end surface 42f and the inner rear end surface 42b in the axial direction Da.

[0024] As shown in FIG. 4 , the blade root groove 46 is recessed from the outer peripheral surface 44 toward the radially inward direction Dri. The blade root groove 46 extends in a groove penetration direction Dm that intersects the axis Ar at an angle and penetrates the rotor blade attachment portion 43. Therefore, the blade root groove 46 has a rear end opening 47b that opens at the outer rear end surface 45b and a front end opening 47f that opens at the outer front end surface 45f. The blade root 52 of the rotor blade 50 is fitted into the blade root groove 46. In this embodiment, the blade root groove 46 extends in the groove penetration direction Dm that intersects the axis Ar at an angle, but this is not limited to this. That is, the blade root groove 46 may extend in a direction parallel to the axial direction Da. In other words, the axial direction Da and the groove penetration direction Dm may or may not be parallel.

[0025] Here, the direction from the first end face 45f to the second end face 45b on both sides of the groove penetration direction Dm is referred to as the insertion direction Dm1, and the direction from the second end face 45b to the first end face 45f is referred to as the withdrawal direction Dm2. In other words, the direction in which the rotor blade 50 is inserted is referred to as the insertion direction Dm1, and the direction in which the rotor blade 50 is withdrawn is referred to as the withdrawal direction Dm2.

[0026] <First embodiment of blade removal device> The blade removal device 60 according to this embodiment will be described with reference to FIG.

[0027] The rotor blade removal device 60 is used when removing the rotor blade 50 fixed to the disk 40 with the blade root 52 inserted in the blade root groove 46. The rotor blade removal device 60 is capable of moving the rotor blade 50 in a removal direction Dm2 relative to the disk 40 to remove the rotor blade 50 from the disk 40. As shown in FIG. 5 , the rotor blade removal device 60 of this embodiment includes a hook 70 and a removal unit 80.

[0028] <hook> The hook 70 is a member configured to be able to come into contact with the rotor blade 50. In this embodiment, only the hook 70 is able to come into contact with the rotor blade 50. The hook 70 includes a contact portion 71, an arm 76, a base 77, and a support portion 78. Here, for the rotor blade removal device 60 of this embodiment, the groove penetration direction Dm is the direction in which the arm 76 extends. The withdrawal direction Dm2 is this groove penetration direction Dm, which is the direction from the contact portion 71 to the withdrawal portion 80. Furthermore, the insertion direction Dm1 is this groove penetration direction Dm, which is the direction from the withdrawal portion 80 to the contact portion 71. Furthermore, the direction perpendicular to the groove penetration direction Dm and in which the contact portion 71 extends is defined as the width direction Dw.

[0029] <Contact part> The contact portion 71 is a member configured to be able to contact the rotor blade 50 from the second axial side Dad in the axial direction Da. The contact portion 71 of the present embodiment has a contact portion main body 72, a first protruding portion 73, a locking portion 74, and a second protruding portion 75.

[0030] The contact portion main body 72 extends in a direction including the width direction Dw. The direction including the width direction Dw may be a direction that coincides with the width direction Dw, or a direction that intersects with the width direction Dw on the same imaginary plane. The contact portion main body 72 of this embodiment extends, for example, parallel to the blade root trailing end surface 53b so as to intersect with the width direction Dw. The contact portion main body 72 is formed in a rod shape that extends linearly. When the blade removal device 60 is in a state to remove the blade 50 from the disk 40, the contact portion main body 72 is located on the axial downstream side Dad of the blade 50.

[0031] The first protrusion 73 extends in the extraction direction Dm2 relative to the contact portion main body 72. The first protrusion 73 is capable of contacting the rotor blade 50 from the second axial side Dad. The first protrusion 73 is capable of contacting, for example, the blade root trailing end surface 53b. In the contact portion 71 of this embodiment, only the first protrusion 73 is capable of contacting the blade root trailing end surface 53b. The first protrusion 73 is disposed at a position away from the end of the contact portion main body 72 in the width direction Dw.

[0032] The locking portion 74 is connected to an end of the contact portion main body 72 in the width direction Dw. The locking portion 74 extends from the contact portion main body 72 in the withdrawal direction Dm2. The locking portion 74 extends further in the radial direction Dr relative to the contact portion main body 72 than the first protrusion 73. The locking portion 74 is formed in a rod shape that extends linearly in the withdrawal direction Dm2. When the rotor blade removal device 60 is in a state to remove the rotor blade 50 from the disk 40, the locking portion 74 is arranged on one side in the width direction Dw relative to the rotor blade 50. The locking portion 74 is arranged spaced apart from the first protrusion 73 in the width direction Dw.

[0033] The second protruding portion 75 extends in the width direction Dw relative to the locking portion 74. The second protruding portion 75 is capable of contacting the blade root side surface 54 from the width direction Dw. In this embodiment, only the second protruding portion 75 is capable of contacting the blade root side surface 54. The second protruding portion 75 is disposed away from the contact portion main body 72 in the withdrawal direction Dm2.

[0034] <Arm> The arm 76 is a member that, when viewed from the radial direction Dr, has the contact portion 71 positioned near the second end face 45b of the rotor blade 50 and the extraction portion 80 positioned near the first end face 45f when the rotor blade removal device 60 is in a state where the hook 70 is in contact with the rotor blade 50, which is the state where the rotor blade removal device 60 is removing the rotor blade 50 from the disk 40. One end of the arm 76 in the groove penetration direction Dm is connected to the contact portion 71. The arm 76 is positioned away from the locking portion 74 in the width direction Dw. That is, the arm 76 is connected to the contact portion 71 at the end opposite the locking portion 74 in the width direction Dw. The arm 76 extends from the contact portion 71 in the extraction direction Dm2. The other end of the arm 76 in the groove penetration direction Dm is connected to the base 77. The arm 76 is formed in a rod shape extending linearly in the extraction direction Dm2. The arm 76 is formed longer than the locking portion 74 in the extraction direction Dm2. When viewed from the radial direction Dr with the hook 70 in contact with the rotor blade 50, the arm 76 is formed longer than the rotor blade 50 in the groove penetration direction Dm and the axial direction Da.

[0035] <Bass> The base 77 is a member connecting the hook 70 and the extraction portion 80. The base 77 is connected to the arm 76 at a position opposite the contact portion 71 in the extraction direction Dm2. The base 77 is connected to the end of the arm 76. The base 77 extends perpendicular to the extraction direction Dm2. That is, in this embodiment, the base 77 extends from the arm 76 on both sides in the width direction Dw. That is, the arm 76 is connected to the middle of the base 77 in the width direction Dw. The base 77 is formed longer than the contact portion main body 72 when viewed from the radial direction Dr with the hook 70 in contact with the rotor blade 50. With the hook 70 in contact with the rotor blade 50, the base 77 is positioned away from the rotor blade 50 in the extraction direction Dm2. The base 77 has a screw hole 77a formed therethrough in the screw penetration direction Ds that is inclined with respect to the groove penetration direction Dm. That is, the screw hole 77a is formed to extend in a direction inclined with respect to the arm 76. A female thread is formed on the inner peripheral surface of the screw hole 77a. Note that, although the screw penetration direction Ds extends at an angle with respect to the groove penetration direction Dm in this embodiment, this is not limited to this. That is, the screw penetration direction Ds may or may not be parallel to the groove penetration direction Dm.

[0036] <Support part> The support portion 78 is a member configured to be able to support the rotor blade 50 together with the contact portion 71 in a state where it cannot move in the extraction direction Dm2. The support portion 78 is able to come into contact with the rotor blade 50 from the first axial side Dau. When the support portion 78 is moved relative to the base 77 so as to approach the contact portion 71, the support portion 78 supports the rotor blade 50 by clamping the rotor blade 50 so as to press it against the contact portion 71. The support portion 78 of this embodiment has a screw shaft 78a and a screw head portion 78b.

[0037] The screw shaft 78a can be inserted into the screw hole 77a. The screw shaft 78a can move relative to the base 77 while inserted into the screw hole 77a. The screw shaft 78a extends linearly. An external thread that screws into the internal thread of the screw hole 77a is formed on the outer peripheral surface 44 of the screw shaft 78a. The tip of the screw shaft 78a can come into contact with the blade root leading end surface 53f of the rotor blade 50.

[0038] The support portion 78 further includes a screw head portion 78b at a position opposite to the contact portion 71 in the screw penetration direction Ds.

[0039] The screw head 78b prevents the screw shaft 78a from falling out of the screw hole when the screw shaft 78a is moved closer to the contact portion 71. The screw head 78b is connected to the end of the screw shaft 78a in the screw penetration direction Ds. When the screw shaft 78a is inserted into the screw hole, the screw head 78b is disposed on the opposite side of the base from the contact portion 71 and the arm 76. The screw head 78b extends concentrically with the screw shaft 78a in the radial direction Dr of the screw penetration direction Ds. The outer diameter of the screw head 78b is larger than that of the screw shaft 78a. The cross-sectional shape of the screw head 78b in the screw penetration direction Ds is not limited to a circle. For example, it may be a rectangle or a hexagon.

[0040] <Removal part> The extraction portion 80 is a member that moves the hook 70 in the extraction direction Dm2. The extraction portion 80 is connected to the hook 70. The extraction portion 80 is connected to the arm 76 at a position opposite to the contact portion 71 in the extraction direction Dm2. The extraction portion 80 is capable of applying a load to the hook 70 in the extraction direction Dm2. The extraction portion 80 is detachable from the hook 70. The extraction portion 80 of this embodiment is indirectly connected to the arm 76 via the base 77. The extraction portion 80 includes a first frame 81 and a second frame 82.

[0041] <First frame> The first frame 81 is a member that extends so as to extend the arm 76 in the drawing-out direction Dm2. The first frame 81 extends in the drawing-out direction Dm2. The first frame 81 is formed in a rod shape that extends linearly in the drawing-out direction Dm2. The first frame 81 is formed to be longer than the arm 76 in the drawing-out direction Dm2. A pair of first frames 81 are arranged apart in the width direction Dw. The pair of first frames 81 are connected to both ends of the base 77 in the width direction Dw. The first frames 81 are detachably fixed to the end of the base 77 via bolts (not shown).

[0042] <Second frame> The second frame 82 is a member to which a load can be applied in the extraction section 80. The second frame 82 is connected to the first frame 81 at a position opposite the hook 70 in the extraction direction Dm2. The second frame 82 extends perpendicular to the extraction direction Dm2 relative to the first frame 81. That is, the second frame 82 extends in the width direction Dw relative to the first frame 81. The second frame 82 is formed in a rod shape extending linearly in the width direction Dw. The second frame 82 is disposed away from the base 77 in the extraction direction Dm2. The second frame 82 is connected to an end of the first frame 81 opposite to the end connected to the base 77. The second frame 82 connects the pair of first frames 81. The second frame 82 is detachably fixed to the pair of first frames 81 via bolts. The second frame 82 is contactable with the chipping hammer 90. The chipping hammer 90 is disposed between the pair of first frames 81 in the width direction Dw, and is disposed relative to the second frame 82 so as to apply an impact from the base 77 toward the second frame 82 in the drawing direction Dm2. In other words, a load can be applied to the second frame 82 by the chipping hammer 90 in the drawing direction Dm2.

[0043] The driving system of the chipping hammer 90 does not matter, and it may be hydraulic or electric, for example.

[0044] In this embodiment, the lengths of the base 77 and the second frame 82 in the width direction Dw are longer than the lengths of the contact portions 71 in a direction including the width direction Dw. For convenience, all of these lengths are defined here as widths perpendicular to the pulling-out direction Dm2.

[0045] Furthermore, the length of the second frame 82 in the direction perpendicular to both the drawing-out direction Dm2 and the width direction Dw is longer than the length of the base 77. That is, the length of the second frame 82 in the direction perpendicular to both the drawing-out direction Dm2 and the width direction Dw is longer than the length of the contact portion 71.

[0046] <Embodiment of Blade Removal Method> The blade removal method S10 in this embodiment will be described with reference to the flowchart shown in FIG.

[0047] The rotor blade removal method S10 is a method of removing the rotor blade 50 by pulling it out from the disk 40 using the rotor blade removal device 60. In the rotor blade removal method S10, the rotor blade 50 is removed without removing the upper half of the compressor casing 35. The rotor blade removal method S10 in this embodiment includes a preparation step S1, a disk rotation step S2, an apparatus arrangement step S3, and a rotor blade movement step S4. Here, an example of removing one rotor blade 50 from the first stage disk 40f will be described.

[0048] First, a preparation step S1 is performed. In this preparation step S1, the rotor blade removal device 60 described above is prepared.

[0049] After the preparation step S1 is performed, the disk rotation step S2 is performed. In this disk rotation step S2, as shown in Fig. 4, the disk 40 is rotated around the axis Ar. At this time, the disk 40 is rotated so that the entire rotor blade 50a to be removed is positioned vertically above the axis Ar. Note that if the entire rotor blade 50a to be removed is already positioned vertically above the axis Ar, there is no need to rotate the disk 40. In other words, the disk rotation step S2 may be omitted.

[0050] After the disk rotation step S2 is performed, the device placement step S3 is performed. In this device placement step S3, the rotor blade removal device 60 is placed on the first stage disk 40f, as shown in Fig. 7. Specifically, this device placement step S3 includes a hook placement step S31 and a support portion placement step S32.

[0051] First, the hook placement step S31 is performed. The hook 70 is moved in the insertion direction Dm1 along the blade root side surface 54 while avoiding contact with the blade 50. If it is difficult to move the hook 70 without contacting the blade 50, one of the multiple blades 50 arranged in an annular arrangement adjacent to the blade 50a to be removed on the side where the hook 70 is inserted in the circumferential direction Dc may be removed in advance. The blade removal device 60 is positioned so that the hook 70 contacts the blade 50a to be removed from the second axial side Dad in the axial direction Da, and the extraction portion 80 is located on the first axial side Dau in the axial direction Da. Here, the portion of the hook 70 that contacts the blade 50a to be removed is the contact portion 71, more specifically, the first protrusion 73. The first protrusion 73 comes into contact with the aft end of the blade 50. Furthermore, with the first protruding portion 73 in contact with the aft end of the blade 50, the blade root side surface 54 of the blade 50a to be removed is brought into contact with the second protruding portion 75 in the span direction Dw. With the first protruding portion 73 and the second protruding portion 75 in contact with the blade 50, the groove penetration direction Dm and the extending direction of the arm 76 are parallel to each other. This positions the hook 70 relative to the blade 50a to be removed at a position that allows removal.

[0052] After the hook placement process S31 is performed, the support portion placement process S32 is performed. While the first protrusion 73 and the second protrusion 75 are in contact with the rotor blade 50, the extraction portion 80 is positioned on the first axial side Dau relative to the rotor blade 50 in the axial direction Da. Then, the support portion 78, with the screw shaft 78a threadedly engaged with the screw hole 77a, is rotated, thereby moving the support portion 78 toward the screw penetration direction Ds and closer to the rotor blade 50a to be removed. The support portion 78 is moved until the tip of the screw shaft 78a contacts the blade root leading end surface 53f of the rotor blade 50a to be removed. The tip of the screw shaft 78a contacts the rotor blade 50 while applying a load that presses the rotor blade 50 toward the first protrusion 73. Therefore, the rotor blade 50a to be removed is supported by the first protrusion 73 and the tip of the screw shaft 78a in a state where it cannot move in the groove penetration direction Dm. Furthermore, in this embodiment, in addition to the first protruding portion 73 and the tip of the screw shaft 78a, the second protruding portion 75 also contacts the rotor blade 50. That is, the rotor blade 50a to be removed is in contact with the rotor blade removal device 60 at three points: the first protruding portion 73, the second protruding portion 75, and the tip of the screw shaft 78a. Therefore, the rotor blade 50 is supported in a state where it cannot move not only in the groove penetration direction Dm but also in the circumferential direction Dc. As a result, the support portion 78 is positioned at a position where the rotor blade 50a to be removed cannot move.

[0053] Furthermore, in the device arranging step S3, before or after the hook arranging step S31 and the support part arranging step S32, a fall prevention process for the rotor blade 50 and the rotor blade removal device 60 may be performed as necessary.

[0054] After the device placement step S3 is performed, the rotor blade moving step S4 is performed. This rotor blade moving step S4 includes a moving step S5 and a determining step S6.

[0055] In the moving step S5, the chipping hammer 90 applies a load to the second frame 82 in the extraction direction Dm2, thereby moving the rotor blade 50a to be removed in the extraction direction Dm2 and extracting it from the disk 40. Specifically, first, the chipping hammer 90 is positioned between the pair of first frames 81 in the width direction Dw and is positioned in contact with the second frame 82. The chipping hammer 90 is positioned relative to the second frame 82 so as to apply a load by impacting the second frame 82 in the extraction direction Dm2. After the chipping hammer 90 is positioned, the chipping hammer 90 is driven and applies a load to the second frame 82 in the extraction direction Dm2.

[0056] In the determination step S6, it is determined whether or not the blade root 52 of the blade 50a to be removed has come out of the blade root groove 46 as a result of the execution of the moving step S5. If it is determined here that the blade root 52 of the blade 50a to be removed has not come out of the blade root groove 46, the moving step S5 is executed again.

[0057] In this manner, the moving step S5 and the determining step S6 are repeatedly executed until it is determined in the determining step S6 that the blade root 52 of the blade 50a to be removed has come out of the blade root groove 46.

[0058] <Action and effect> According to the above-described blade removal device 60 and blade removal method S10, the hook 70 contacts the blade 50 from the second axial side Dad in the axial direction Da. Specifically, in the hook placement step S31, the first protrusion 73 contacts the blade root trailing end surface 53b of the blade 50 located on the second axial side Dad. Furthermore, the second protrusion 75 contacts the blade root side surface 54. In this state, the extraction part 80 is positioned opposite the hook 70 relative to the blade 50 in the axial direction Da. Thereafter, in the blade moving step S4, a load is applied to the extraction part 80 in the extraction direction Dm2 by the chipping hammer 90. Therefore, by applying a load in the extraction direction Dm2 to the extraction part 80 with the hook 70 in contact with the blade 50, the blade 50 is removed by being pulled in the extraction direction Dm2. Therefore, according to this embodiment, the blade 50 can be removed by being pulled out from the disk 40.

[0059] Furthermore, with this structure, an operator can contact the rotor blade 50 from the first axial side Dau in the axial direction Da with the hook 70 from the second axial side Dad, or apply a load in the extraction direction Dm2 to the extraction part 80. Therefore, the operator can remove the rotor blade 50 by accessing the rotor blade 50 from the first axial side Dau in the axial direction Da. Therefore, even if the operator cannot directly access the rotor blades 50 spaced apart in the axial direction Da, the rotor blade 50 can be removed without removing the upper half of the casing to open the casing. As a result, the rotor blade removal device 60 and the rotor blade removal method S10 according to this embodiment make it possible to remove the rotor blade 50 without opening the casing.

[0060] Furthermore, with the blade removal device 60 attached to the blade 50, i.e., with the hook placement step S31 performed, the hook 70 engages with the blade 50. Specifically, the hook 70 engages with the blade 50 when the first protrusion 73 contacts the blade root trailing end surface 53b and the second protrusion 75 contacts the blade root side surface 54. In other words, the blade 50 is supported by the blade removal device 60 in the groove penetration direction Dm and the circumferential direction Dc. This limits the movement of the blade 50 in the groove penetration direction Dm and the circumferential direction Dc. Therefore, according to this embodiment, the blade 50 is removed by pulling it out from the disk 40 without damaging the shape of the blade 50, particularly the blade body 51. Furthermore, because the blade 50 is supported, a load is stably applied to the blade 50 in the pulling direction Dm2. Therefore, according to this embodiment, the blade 50 can be easily removed from the disk 40.

[0061] According to this embodiment, the rotor blade 50 is further supported by the support portion 78. Specifically, the rotor blade 50 contacts the tip of the screw shaft 78a from the first axial side Dau in the axial direction Da. When the rotor blade removal device 60 is attached to the rotor blade 50, the rotor blade 50 contacts the first protruding portion 73 from the second axial side Dad and the tip of the screw shaft 78a from the first axial side Dau in the axial direction Da. This supports the rotor blade 50 so that it cannot move in the withdrawal direction Dm2. As already described, since the rotor blade 50 also contacts the second protruding portion 75, according to this embodiment, the rotor blade 50 is supported at three points by the rotor blade removal device 60, providing more stable support. This allows the rotor blade 50 to be pulled out and removed from the disk 40 in a manner that is less likely to damage the shape of the rotor blade 50, particularly the blade body 51. Furthermore, because the rotor blade 50 is supported in a more stable manner by the three-point support, removal can be performed more easily.

[0062] In this embodiment, the hook 70 is connected to the arm 76 at a position opposite the contact portion 71 in the withdrawal direction Dm2 and has a base 77 extending perpendicular to the withdrawal direction Dm2. The support portion 78 is moved relative to the base 77 so as to approach the hook 70, specifically the contact portion 71. By positioning the blade removal device 60 relative to the blade 50 in this manner, the blade 50 is supported by being sandwiched between the support portion 78 and the contact portion 71, as if the blade 50 is being pushed toward the contact portion 71. In other words, the blade 50 is pushed by the support portion 78 in a direction including the insertion direction Dm1, and is supported by being sandwiched between the support portion 78 and the contact portion 71. The direction including the insertion direction Dm1 may be a direction that coincides with the insertion direction Dm1 or a direction that intersects the insertion direction Dm1 on the same imaginary plane. In this manner, the blade 50 is more stably supported by being sandwiched between the support portion 78 and the contact portion 71. Therefore, the rotor blades 50 can be more easily removed from the disk 40 .

[0063] Furthermore, in this embodiment, the base 77 has a female thread formed on its inner peripheral surface, and a threaded hole 77a penetrating in the thread penetration direction Ds. A male thread that threadably mates with the female thread of the threaded hole 77a is formed on the outer peripheral surface 44 of the threaded shaft 78a. When the threaded shaft 78a is inserted into the threaded hole 77a, the support portion 78 is rotated, and the support portion 78 is moved in the thread penetration direction Ds. This allows the tip of the threaded shaft 78a to contact the rotor blade 50 from the first axial side Dau in the axial direction Da. More specifically, the tip of the threaded shaft 78a contacts the rotor blade 50 at the blade root leading end surface 53f. Since the support portion 78 is structured to be moved by a screw in this manner, it is possible to easily adjust the force that the support portion 78 exerts to press the rotor blade 50.

[0064] In this embodiment, the extraction unit 80 is capable of applying a load to the hook 70 in the extraction direction Dm2. This is because the second frame 82 extends perpendicular to the extraction direction Dm2, i.e., parallel to the base 77, and the second frame 82 is capable of applying a load in the extraction direction Dm2. The first frame 81 is formed longer than the arm 76 in the extraction direction Dm2. This allows the second frame 82 to be spaced apart from the blade 50 in the axial direction Da when the blade removal device 60 is installed on the blade 50. This makes it easier for an operator to perform steps such as applying a load to the second frame 82 in the extraction direction Dm2. Furthermore, because the first frames 81 are arranged in pair and spaced apart in the width direction Dw of the base 77, the hook 70 is stably connected to the extraction unit 80. This allows a load to be stably applied to the hook 70 in the extraction direction Dm2. This allows the blade 50 to be stably and easily removed.

[0065] Furthermore, in this embodiment, the length of the base 77 and the second frame 82 in the width direction Dw is longer than the length of the contact portion 71 in a direction including the width direction Dw. Since the contact portion 71 is provided so as to engage with the rotor blade 50, the length of the contact portion 71 in the direction including the width direction Dw is longer than the thickness of the rotor blade 50 in the circumferential direction Dc, but is not significantly longer than the rotor blade 50. By forming the length of the base 77 and the second frame 82 in the width direction Dw to be longer than the length of the contact portion 71 in the direction including the width direction Dw, the extraction portion 80 can be formed to a size that is easy to handle.

[0066] Furthermore, the length of the second frame 82 is longer than the length of the base 77 in the directions perpendicular to both the drawing direction Dm2 and the width direction Dw. That is, the length of the second frame 82 is longer than the length of the contact portion 71 in the directions perpendicular to both the drawing direction Dm2 and the width direction Dw. In other words, the second frame 82 is thicker than the contact portion 71 in the directions perpendicular to both the drawing direction Dm2 and the width direction Dw. This allows the second frame 82 to be configured so that the surface with which the chipping hammer 90 can come into contact is wider. This makes it easier for the chipping hammer 90 to apply a load to the second frame 82 in the drawing direction Dm2.

[0067] In addition, in this embodiment, the extraction unit 80 is detachable from the hook 70. Specifically, the first frame 81 is fixed to an end of the base 77 via bolts, and the second frame 82 is fixed to the first frame 81 via bolts at a position opposite the hook 70 in the extraction direction Dm2. By being fixed via bolts in this manner, the first frame 81 and the base 77, and the first frame 81 and the second frame 82, are detachably fixed. Because the extraction unit 80 is detachable from the hook 70, an extraction unit 80 having a configuration different from that of this embodiment can also be used. An example of an extraction unit having a different configuration is the extraction unit 80a of the second embodiment described below. This allows the extraction unit to be changed as needed depending on the application, etc.

[0068] In the blade removal device 60 and blade removal method S10 according to this embodiment, the load applied to the second frame 82 can be applied in the extraction direction Dm2 by the chipping hammer 90. That is, the chipping hammer 90 applies a load to the second frame 82 to remove the blade 50 by pulling it in the extraction direction Dm2. The blade 50 is removed by being pulled in the extraction direction Dm2. Therefore, when removing the blade 50, the extraction unit 80 and the operator are on the same side of the blade 50 in the extraction direction Dm2. This makes it easier to determine whether the blade root 52 of the blade 50 has been released from the blade root groove 46 in the determination step S6. This also helps prevent the blade 50 from falling off. Furthermore, the chipping hammer 90 allows a load to be applied to the second frame 82 even in a narrow space. Furthermore, by using a chipping hammer 90 that does not require human power, such as a hydraulic or electric type, it becomes possible to easily apply a load to the second frame 82.

[0069] <Second embodiment of blade removal device> Next, a second embodiment of the present disclosure will be described with reference to Fig. 8. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0070] The blade removal device 60a according to the second embodiment is capable of removing the blade 50 from the disk 40 by moving the blade 50 in a removal direction Dm2 relative to the disk 40. In the second embodiment, the structure of the removal unit 80a is significantly different from that of the first embodiment. As shown in FIG. 8, the blade removal device 60a according to the second embodiment includes a hook 70 and the removal unit 80a. The hook 70 differs from the first embodiment only in the structure of its base 77.

[0071] The base 77 in the second embodiment further includes a connecting hole 77b for connection to the pull-out portion 80a. The connecting hole 77b is formed to be shorter than the length of the base 77 in the groove penetration direction Dm. In other words, the connecting hole 77b is formed so as not to penetrate the base 77 in the groove penetration direction Dm. The connecting hole 77b is formed so that the central axis of the arm 76 and the central axis of the connecting hole 77b coincide with each other in the shaft penetration direction. A female thread is formed on the inner peripheral surface of the connecting hole 77b.

[0072] <Removal part> The extraction unit 80a of the second embodiment is configured so that it does not require any other separate member that applies impact, such as a chipping hammer 90. In other words, the extraction unit 80a can apply a load to the hook 70 in the extraction direction Dm2 by itself. Note that, like the extraction unit 80 of the first embodiment, the extraction unit 80a of the second embodiment is a member that moves the hook 70 in the extraction direction Dm2. The extraction unit 80a of the second embodiment includes a support pillar 83, an impact unit 84, and a hammer unit 85.

[0073] <Support pillar> The support pillar 83 is a member that extends so as to extend the arm 76 in the drawing-out direction Dm2. The support pillar 83 extends in the drawing-out direction Dm2. The support pillar 83 is formed in a rod shape that extends linearly in the drawing-out direction Dm2. One end of the support pillar 83 in the drawing-out direction Dm2 is insertable into the connecting hole 77b. One end of the support pillar 83 in the drawing-out direction Dm2 has an outer peripheral surface 44 formed with a male thread that screws into the female thread of the connecting hole 77b. The support pillar 83 is detachably fixed to the base 77 with one end of the support pillar 83 in the drawing-out direction Dm2 inserted into the connecting hole 77b. In this state, the support pillar 83 is fixed such that the central axis of the arm 76 and the central axis of the support pillar 83 coincide with each other in the axial penetration direction.

[0074] <Impact part> The impact portion 84 is a member capable of applying a load in the extraction portion 80a. The impact portion 84 is capable of coming into contact with a hammer portion 85, which will be described later. The impact portion 84 is capable of applying a load in the extraction direction Dm2 by the hammer portion 85. The impact portion 84 is connected to the support column 83 at an end opposite the hook 70 in the extraction direction Dm2. In other words, the impact portion 84 is connected to the support column 83 at the other end of the support column 83 in the extraction direction Dm2. The impact portion 84 expands the diameter of the support column 83 in the extraction direction Dm2 and extends perpendicular to the extraction direction Dm2 relative to the support column 83. In other words, the impact portion 84 extends parallel to the extension direction of the base 77. In other words, the impact portion 84 extends in the width direction Dw.

[0075] The cross-sectional shape of the impact part 84 extending perpendicularly to the drawing direction Dm2 does not matter, and may be, for example, a polygonal shape or a circular shape.

[0076] Furthermore, the impact portion 84 may be manufactured by any method. For example, the support pillar 83 and the impact portion 84 may be connected by welding. Alternatively, the support pillar 83 and the impact portion 84 may be manufactured as a single unit by being cut out from a single material.

[0077] <Hammer section> The hammer portion 85 is configured to be able to apply a load to the hook 70 to move it in the pulling-out direction Dm2. More specifically, the hammer portion 85 is configured to be able to apply a load to the impact portion 84 in the pulling-out direction Dm2. In other words, the hammer portion 85 is configured to be able to collide with the impact portion 84 from the base 77 toward the impact portion 84 in the pulling-out direction Dm2. The hammer portion 85 extends perpendicular to the pulling-out direction Dm2 with respect to the support column 83. In other words, the hammer portion 85 expands parallel to the extension direction of the base 77 and the expansion direction of the impact portion 84. In other words, the hammer portion 85 expands in the width direction Dw. The hammer portion 85 is provided so as to be located between the base 77 and the impact portion 84 in the pulling-out direction Dm2. The hammer portion 85 is capable of moving in the pulling-out direction Dm2 with the support column 83 inserted therein. That is, the hammer portion 85 is configured to be movable in the pulling-out direction Dm2 between the base 77 and the impact portion 84. That is, the hammer portion 85 is configured to be able to apply a load to the hook 70 in the pulling-out direction Dm2 when a hammer portion main body 86 (described later) collides with the impact portion 84. The hammer portion 85 has the hammer portion main body 86 and a handle portion 87.

[0078] The hammer body 86 is configured to be able to come into contact with the impact portion 84. More specifically, the hammer body 86 is configured to be able to come into contact with the surface of the impact portion 84 on the base 77 side in the pulling-out direction Dm2. The hammer body 86 extends in the width direction Dw. The hammer body 86 is formed in a rod shape that extends linearly in the width direction Dw. The hammer body 86 is formed with an insertion portion 86a that penetrates in the pulling-out direction Dm2. The support pillar 83 can be inserted into the insertion portion 86a. When the support pillar 83 is inserted into the insertion portion 86a, the insertion portion 86a is not bonded and is able to move relative to each other.

[0079] The handle portion 87 is configured to facilitate handling of the hammer portion 85. The handle portion 87 extends in the width direction Dw. The handle portions 87 are provided on both ends of the hammer portion main body 86 in the width direction Dw. The handle portion 87 in the second embodiment is formed integrally with the hammer portion main body 86 by being cut out from a single material. The handle portion 87 is formed so that its diameter in the width direction Dw is smaller than that of the hammer portion main body 86.

[0080] The hammer body 86 and the handle 87 may be manufactured as a single unit as described above, or may be manufactured in other ways. For example, a pair of handles 87 may be welded to both ends of the hammer body 86 in the width direction Dw. Alternatively, the hammer body 86 and the handle 87 may be connected by threading a female screw and a male screw together, instead of by welding.

[0081] <Embodiment of Blade Removal Method> The blade removal method S100 according to the second embodiment will be described with reference to the flowchart shown in Fig. 9. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0082] After the disk rotation step S2 is performed, the device placement step S3A is performed. In this device placement step S3A, the blade removal device 60a according to the second embodiment is placed on the first stage disk 40f. Specifically, this device placement step S3A includes a hook placement step S31A and a support portion placement step S32A. The hook placement step S31A and the support portion placement step S32A in the second embodiment are performed in the same manner as the hook placement step S31 and the support portion placement step S32 in the first embodiment.

[0083] After the device placement step S3A is performed, the blade moving step S4A is performed, which includes a moving step S5A and a determining step S6A.

[0084] In the moving step S5A, the hammer portion 85 applies a load to the impact portion 84 in the extraction direction Dm2, thereby moving the rotor blade 50 to be removed in the extraction direction Dm2 and extracting it from the disk 40. Specifically, first, the hammer portion main body 86 is positioned so as not to contact the impact portion 84. The handle portion 87 is moved forcefully in the extraction direction Dm2, thereby moving the hammer portion 85 in the extraction direction Dm2. This causes the hammer portion main body 86 to collide with the surface of the impact portion 84 on the side of the base 77 in the extraction direction Dm2. Then, a load is applied to the impact portion 84 in the extraction direction Dm2.

[0085] The determination step S6A is performed in the same manner as the determination step S6 in the first embodiment. The moving step S5A and the determination step S6A are repeatedly performed until it is determined in the determination step S6A that the blade root 52 of the blade 50a to be removed has come out of the blade root groove 46. When the moving step S5A is performed again, the hammer part 85 is moved in the insertion direction Dm1 so that the hammer part body 86 does not come into contact with the impact part 84.

[0086] <Action and effect> According to the rotor blade removal device 60a and rotor blade removal method S100 of the second embodiment described above, a load is applied to the hook 70 in the extraction direction Dm2 by the extraction part 80a. Specifically, the hammer part 85 is moved in the extraction direction Dm2. The hammer part body 86 collides with the impact part 84 from the base 77 side in the extraction direction Dm2. In this manner, a load is applied to the hook 70 in the extraction direction Dm2 by the extraction part 80a. Therefore, the rotor blade removal device 60a and the rotor blade removal method S100 according to the second embodiment also make it possible to remove the rotor blade 50 from the disk 40 in a pulling-out manner.

[0087] According to the second embodiment, the extraction unit 80a is subjected to a load in the extraction direction Dm2 solely through its structure. In other words, the extraction unit 80a of the second embodiment does not require any other components to receive a load in the extraction direction Dm2. In the moving step S5A, the hammer body 86 is positioned out of contact with the impact unit 84. A load in the extraction direction Dm2 is applied to the handle 87, causing the hammer unit 85 to move in the extraction direction Dm2. This causes the hammer body 86 to collide with the surface of the impact unit 84 facing the base 77 in the extraction direction Dm2. A load is then applied to the impact unit 84 in the extraction direction Dm2. This step does not require a machine such as the chipping hammer 90 of the first embodiment. Therefore, according to the second embodiment, the extraction unit 80a does not require any other machine to receive a load in the extraction direction Dm2.

[0088] Furthermore, in the second embodiment, the extractor 80a is detachably attached to the hook 70. Specifically, the base 77 has a connecting hole 77b with a female thread formed on its inner circumferential surface, and the support post 83 has a male thread formed on its outer circumferential surface 44 at one end in the extracting direction Dm2. The end of the support post 83 in the extracting direction Dm2 is inserted into the connecting hole 77b, and the female thread and the male thread are threaded together, thereby detachably fixing the extractor 80a to the hook 70. Because the extractor 80a is detachable from the hook 70, an extractor 80 having a configuration different from that of the second embodiment can also be used. An example of an extractor of a different configuration is the extractor 80 of the first embodiment. This allows the extractor to be changed as needed depending on the application, etc.

[0089] <Other embodiments> Each embodiment of the present disclosure has been described above in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0090] For example, the blade removal devices 60, 60a according to one embodiment may be made of a single material, or may be made of a combination of different materials as appropriate.

[0091] Furthermore, in the blade removal device 60, 60a according to one embodiment, the hook 70 may not include the base 77, and the arm 76 and the extraction portion 80, 80a may be directly connected to each other.

[0092] Furthermore, the blade removal device 60 according to the first embodiment may have only one first frame 81 instead of a pair.

[0093] Furthermore, the blade removal device 60, 60a according to one embodiment may not include the support portion 78.

[0094] Furthermore, the blade removal device 60, 60a according to one embodiment may not include the locking portion 74 and the second protruding portion 75.

[0095] The blade removal devices 60, 60a and blade removal methods S10, S100 according to the present disclosure can be suitably used for removing the first-stage blades 50 from the disk 40 without opening the casing of the compressor 30, but are not limited to this. For example, they may be applied to blades 50 other than the first-stage blades 50 that are removed by opening the casing of the compressor 30. Furthermore, the blade removal devices 60, 60a and blade removal methods S10, S100 are not limited to being applied to the compressor 30, but may also be applied to other axial flow rotary machines such as the turbine 10.

[0096] <Additional Notes> The blade removal device and blade removal method described in each embodiment can be understood, for example, as follows.

[0097] (1) A rotor blade removal device 60, 60a according to a first aspect is a rotor blade removal device 60, 60a for removing a rotor blade 50 from a disk 40, the disk 40 having an outer peripheral surface 44 extending in a circumferential direction Dc about an axis Ar, a first end surface 45f facing a first axis side Dau among both sides in an axial direction Da in which the axis Ar extends, and a second end surface 45f facing a second axis side Dad opposite to the first axis side Dau. The blade root groove 46 is recessed from the outer peripheral surface 44 toward the radially inner side Dri in the radial direction Dr relative to the axis Ar and penetrates from the second end surface 45b to the first end surface 45f. The rotor blade 50 has a blade body 51 that has a blade shape in a cross section perpendicular to the radial direction Dr and extends in the radial direction Dr, and a blade body 51 that is provided on the radially inner side Dri of the blade body 51 and is disposed on the first side of the axis Ar. the blade root 52 inserted from Dau toward the second axial side Dad and fitted in the blade root groove 46, the blade removal device 60, 60a comprises a hook 70 capable of contacting the blade 50, and a withdrawal portion 80, 80a connected to the hook 70 and moving the hook 70 in a withdrawal direction Dm2 from the second end face 45b toward the first end face 45f, the hook 70 having a contact portion 71 capable of contacting the blade 50 from the second axial side Dad in the axial direction Da, and an arm 76 extending from the contact portion 71 in the withdrawal direction Dm2, the withdrawal portion 80, 80a connected to the arm 76 at a position opposite to the contact portion 71 in the withdrawal direction Dm2, and capable of applying a load to the hook 70 in the withdrawal direction Dm2.

[0098] According to the above configuration, the hook 70 contacts the rotor blade 50 from the second axial side Dad in the axial direction Da. In this state, the extraction units 80, 80a are positioned opposite the hook 70 with respect to the rotor blade 50 in the axial direction Da. Thereafter, a load is applied to the extraction unit 80 in the extraction direction Dm2. Therefore, by applying a load in the extraction direction Dm2 to the extraction unit 80 with the hook 70 in contact with the rotor blade 50, the rotor blade 50 is removed by being pulled out in the extraction direction Dm2. Furthermore, an operator can contact the hook 70 with the rotor blade 50 from the second axial side Dad or apply a load to the extraction unit 80 in the extraction direction Dm2 from the first axial side Dau in the axial direction Da with respect to the rotor blade 50. Therefore, even if an operator cannot directly access the rotor blades 50 spaced apart in the axial direction Da, the rotor blade 50 can be removed without removing the upper half of the casing to open the casing. As a result, according to this embodiment, it is possible to remove the rotor blades 50 without opening the casing.

[0099] (2) The blade removal device 60, 60a according to the second aspect is the blade removal device 60, 60a of (1), wherein the hook 70 is capable of contacting the blade 50 from the first axial side Dau and further includes a support portion 78 that, together with the contact portion 71, is capable of supporting the blade 50 in a state where it cannot move in the extraction direction Dm2.

[0100] According to the above configuration, the rotor blade 50 is further supported by the support portion 78. Specifically, the rotor blade 50 contacts the tip of the support portion 78 from the first axial side Dau in the axial direction Da. With the rotor blade removal device 60, 60a attached to the rotor blade 50, the rotor blade 50 contacts the hook 70 from the second axial side Dad and the support portion 78 from the first axial side Dau in the axial direction Da. This supports the rotor blade 50 in a state where it cannot move in the withdrawal direction Dm2. Therefore, according to this embodiment, the rotor blade 50 can be pulled out and removed from the disk 40 in a state where the shape of the rotor blade 50 is less likely to be damaged.

[0101] (3) The blade removal device 60, 60a according to a third aspect is the blade removal device 60, 60a of (2), wherein the hook 70 is connected to the arm 76 at a position opposite the contact portion 71 in the withdrawal direction Dm2 and has a base 77 extending perpendicular to the withdrawal direction Dm2, and the support portion 78 is moved relative to the base 77 so as to approach the hook 70, thereby clamping the blade 50 against the contact portion 71 and supporting the blade 50.

[0102] According to the above configuration, the hook 70 is connected to the arm 76 at a position opposite the contact portion 71 in the extraction direction Dm2 and has a base 77 extending perpendicular to the extraction direction Dm2. The support portion 78 is moved relative to the base 77 so as to approach the hook 70. By arranging the rotor blade removal devices 60, 60a with respect to the rotor blade 50 in this manner, the rotor blade 50 is supported by being sandwiched between the support portion 78 and the contact portion 71, thereby pushing the rotor blade 50 toward the contact portion 71. By being supported by being sandwiched between the support portion 78 and the contact portion 71, the rotor blade 50 is supported more stably. Therefore, according to this embodiment, it is possible to more easily remove the rotor blade 50 from the disk 40.

[0103] (4) A fourth aspect of the blade removal device 60, 60a is the blade removal device 60, 60a of (2) or (3), wherein the base 77 has a screw hole 77a formed therein, the support portion 78 has a screw shaft 78a that is inserted into the screw hole 77a and is movable relative to the base 77, and the screw shaft 78a is moved relative to the base 77 so as to approach the contact portion 71, thereby making it possible for the screw shaft 78a to come into contact with the blade 50 from the first axial side Dau.

[0104] According to the above configuration, when the screw shaft 78a is inserted into the screw hole 77a, the support portion 78 is rotated and moved relative to the base 77. This allows the support portion 78 to come into contact with the rotor blade 50 from the first axial side Dau in the axial direction Da. Therefore, according to this aspect, it is possible to easily adjust the force that acts by the support portion 78 to press the rotor blade 50.

[0105] (5) The blade removal device 60, 60a according to a fifth aspect is the blade removal device 60, 60a according to any one of (1) to (4), in which the extracting portion 80, 80a is detachable from the hook .

[0106] According to the above configuration, it is possible to use a pull-out portion of a different type from the pull-out portions 80 and 80a of one type, and therefore the pull-out portion to be used can be changed as appropriate depending on the application, etc.

[0107] (6) A sixth aspect of the rotor blade removal device 60 is the rotor blade removal device 60 of any one of (1) to (5), wherein the extraction unit 80 includes a first frame 81 extending in the extraction direction Dm2 relative to the hook 70 so as to extend the arm 76, and a second frame 82 connected to the first frame 81 at a position opposite the hook 70 in the extraction direction Dm2 and extending perpendicular to the extraction direction Dm2 relative to the first frame 81, and the second frame 82 is capable of applying the load.

[0108] According to the above configuration, the second frame 82 extends in a direction perpendicular to the extraction direction Dm2, and the second frame 82 can apply a load in the extraction direction Dm2. The first frame 81 allows the second frame 82 to be positioned at a distance from the rotor blade 50 in the axial direction Da when the rotor blade removal device 60 is installed on the rotor blade 50. This makes it easier for an operator to perform steps such as applying a load to the second frame 82 in the extraction direction Dm2. Therefore, according to this embodiment, the rotor blade 50 can be removed stably and easily.

[0109] (7) The rotor blade removal device 60 according to a seventh aspect is the rotor blade removal device 60 according to any one of (1) to (6), wherein the load can be applied to the extracting section 80 by a chipping hammer 90.

[0110] According to the above configuration, the chipping hammer 90 applies a load to the second frame 82 to pull and remove the rotor blade 50 in the extraction direction Dm2. Therefore, when removing the rotor blade 50, the extraction unit 80 and the worker are on the same side of the rotor blade 50 in the extraction direction Dm2. This makes it easier to determine whether the rotor blade 50 has come out of the blade root groove 46. This also helps prevent the rotor blade 50 from falling off. Furthermore, the chipping hammer 90 makes it possible to apply a load to the second frame 82 even in a narrow space.

[0111] (8) The rotor blade removal device 60a according to an eighth aspect is the rotor blade removal device 60a of any one of (1) to (5), wherein the extraction unit 80a includes a support pillar 83 extending in a rod shape in the extraction direction Dm2 relative to the hook 70 so as to extend the arm 76, an impact unit 84 connected to the support pillar 83 at a position opposite the hook 70 in the extraction direction Dm2 and extending perpendicular to the extraction direction Dm2 relative to the support pillar 83 so as to expand the diameter of the support pillar 83, and a hammer unit 85 extending perpendicular to the extraction direction Dm2 relative to the support pillar 83, movable in the extraction direction Dm2 with the support pillar 83 inserted therein, and capable of colliding with the impact unit 84.

[0112] According to the above configuration, a load is applied to the hook 70 in the extraction direction Dm2 by the extraction portion 80a. Specifically, the hammer portion 85 is moved in the extraction direction Dm2. The hammer portion 85 then collides with the impact portion 84 from the base 77 side in the extraction direction Dm2. In this manner, a load is applied to the hook 70 in the extraction direction Dm2 by the extraction portion 80a. Therefore, a load in the extraction direction Dm2 is applied to the extraction portion 80 only by the configured structure. Therefore, according to this aspect, the extraction portion 80 can be removed by pulling it out of the rotor blade 50 in the extraction direction Dm2 without using any machinery other than the constituent elements.

[0113] (9) The blade removal device 60, 60a according to the ninth aspect is the blade removal device 60, 60a of any one of (1) to (8), wherein the width of the extraction portion 80, 80a perpendicular to the extraction direction Dm2 is greater than the width of the contact portion 71 perpendicular to the extraction direction Dm2.

[0114] According to the above configuration, the extraction portions 80, 80a are formed larger than the portions that contact the rotor blade 50. Therefore, the extraction portions 80, 80a can be formed to have a size that is easy to handle. Furthermore, the extraction portions 80, 80a can be configured to be easily subjected to a load in the extraction direction Dm2.

[0115] (10) A blade removal method S10, S100 according to a tenth aspect is a blade removal method S10, S100 for removing a blade 50 from a disk 40, the disk 40 having an outer peripheral surface 44 extending in a circumferential direction Dc about an axis Ar, a first end face 45f facing a first axis side Dau among both sides in an axial direction Da in which the axis Ar extends, a second end face 45b facing a second axis side Dad opposite to the first axis side Dau, and a blade root groove 46, the blade root groove 46 extending from the outer peripheral surface 44 toward a radially inward direction Dri in a radial direction Dr relative to the axis Ar. the rotor blade 50 has a blade body 51 extending in the radial direction Dr, the blade body 51 having an airfoil-shaped cross section perpendicular to the radial direction Dr, and a blade root 52 provided on the radially inner side Dri of the blade body 51 and fitted in the blade root groove 46 in a state of being inserted from the first axial side Dau toward the second axial side Dad, the rotor blade removal method S10, S100 including a preparation step of preparing a rotor blade removal device 60, 60a; a device arrangement step of arranging the rotor blade removal device 60, 60a on the disk 40; and a blade moving step of operating removal devices (60, 60a) to move the rotor blade (50) attached to the disk (40), wherein the rotor blade removal devices (60, 60a) prepared in the preparation step include a hook (70) capable of contacting the rotor blade (50), and extraction units (80, 80a) connected to the hook (70) and moving the hook (70) in a extraction direction (Dm2) from the second end face (45b) toward the first end face (45f), and the hook (70) has a contact portion (71) capable of contacting the rotor blade (50) from the second axial side (Dad) in the axial direction (Da), and a pull-out portion (80, 80a) connected to the hook (70) and moving the hook (70) in a pull-out direction (Dm2) from the contact portion (71) toward the first end face (45f). and an arm 76 extending in the extraction direction Dm2, the extraction portions 80, 80a are connected to the arm 76 at a position opposite to the contact portion 71 in the extraction direction Dm2, and are capable of applying a load to the hook 70 in the extraction direction Dm2, and in the device arrangement step, the hook 70 is brought into contact with the rotor blade 50 from the second axial side Dad in the axial direction Da, and the extraction portions 80, 80a are arranged on the first axial side Dau with respect to the rotor blade 50, and in the rotor blade movement step, the load is applied to the extraction portions 80, 80a, therebyThe rotor blade 50 is moved in the extraction direction Dm2.

[0116] According to the above configuration, the hook 70 contacts the blade 50 from the second axial side Dad in the axial direction Da. In this state, the extraction parts 80, 80a are positioned opposite the hook 70 with respect to the blade 50 in the axial direction Da. Thereafter, in the blade moving process, a load is applied to the extraction parts 80, 80a in the extraction direction Dm2. Therefore, with the hook 70 in contact with the blade 50, a load is applied to the extraction parts 80, 80a in the extraction direction Dm2, and the blade 50 is removed by being pulled out in the extraction direction Dm2. Furthermore, an operator can contact the hook 70 with the blade 50 from the second axial side Dad or apply a load to the extraction part 80 in the extraction direction Dm2 from the first axial side Dau in the axial direction Da with respect to the blade 50. Therefore, even if an operator cannot directly access the rotor blades 50 spaced apart in the axial direction Da, the rotor blades 50 can be removed without removing the upper half of the casing to open the casing. As a result, according to this embodiment, the rotor blades 50 can be removed without opening the casing.

[0117] (11) A rotor blade removal method S10 according to an eleventh aspect is the rotor blade removal method S10 of (10), wherein the extraction unit 80 includes a first frame 81 extending in the extraction direction Dm2 relative to the hook 70 so as to extend the arm 76, and a second frame 82 connected to the first frame 81 at a position opposite the hook 70 in the extraction direction Dm2 and extending perpendicular to the extraction direction Dm2 relative to the first frame 81, wherein the second frame 82 is capable of applying the load, and during the rotor blade moving step, the load is applied to the second frame 82 by a chipping hammer 90 to move the rotor blade 50 in the extraction direction Dm2.

[0118] According to the above configuration, the second frame 82 extends perpendicular to the extraction direction Dm2 and can apply a load in the extraction direction Dm2. The first frame 81 allows the second frame 82 to be spaced apart from the blade 50 in the axial direction Da when the blade removal device 60 is installed on the blade 50. This makes it easier for an operator to perform processes such as applying a load to the second frame 82 in the extraction direction Dm2. Furthermore, during the blade moving process, the chipping hammer 90 applies a load to the second frame 82 to remove the blade 50 by pulling it in the extraction direction Dm2. When removing the blade 50, the extraction unit 80 and the operator are on the same side of the blade 50 in the extraction direction Dm2. Therefore, during the blade moving process, it is easier to determine whether the blade 50 has been released from the blade root groove 46. This also helps prevent the blade 50 from falling off. Furthermore, the chipping hammer 90 makes it possible to apply a load to the second frame 82 even in a narrow space.

[0119] (12) A rotor blade removal method S100 according to a twelfth aspect is the rotor blade removal method S100 of (10), wherein the extraction portion 80a includes a support column 83 extending in a rod shape in the extraction direction Dm2 so as to extend the arm 76 relative to the hook 70, and an impactor 84 connected to the support column 83 at a position opposite to the hook 70 in the extraction direction Dm2 and extending perpendicular to the extraction direction Dm2 relative to the support column 83 so as to expand the diameter of the support column 83. The rotor blade 50 has a striking portion 84, and a hammer portion 85 that extends perpendicular to the support column 83 in the extraction direction Dm2, is movable in the extraction direction Dm2 with the support column 83 inserted therein, and is capable of colliding with the impact portion 84, and in the rotor blade movement process, the hammer portion 85 is moved in the extraction direction Dm2 and collides with the impact portion 84, thereby applying the load to the extraction portion 80a and moving the rotor blade 50 in the extraction direction Dm2.

[0120] According to the above configuration, the hook 70 is applied with a load in the extraction direction Dm2 by the extraction part 80a. Specifically, the hammer part 85 is moved in the extraction direction Dm2. Then, during the blade moving process, the hammer part 85 collides with the impact part 84 from the base 77 side in the extraction direction Dm2. In this manner, the hook 70 is applied with a load in the extraction direction Dm2 by the extraction part 80a. Therefore, the extraction part 80a is applied with a load in the extraction direction Dm2 only by its configured structure. Therefore, according to this aspect, the extraction part 80a can be removed by pulling it out of the blade 50 in the extraction direction Dm2 without using any machinery other than the constituent elements. [Explanation of symbols]

[0121] 1. Gas turbine 2 Gas turbine rotor 5 Gas turbine casing 6 Intermediate casing 10 Turbine 11 Turbine rotor 12 rotor shaft 13 Moving blade row 15 Turbine casing 17 Stator blade row 20 Combustor 30 Compressor 31 Compressor rotor 32 rotor shaft 33 Moving blade row 33f first stage rotor blade row 33s second stage rotor blade row 35 Compressor casing 37 Stator blade row 40 discs 40f First stage disc 40s second stage disc 41 Torso 42f Inner front end surface 42b Medial rear end surface 43 Blade attachment part 44 Outer surface 45f First end surface (outer front end surface) 45b Second end surface (outer rear end surface) 46 Wing root groove 47f front end opening 47b Rear end opening 50 Moving blade 50a Blade to be removed 51 Wing body 51f leading edge 51b Trailing edge 51s wing surface 52 Wing root 53f Wing root front end surface 53b Wing root rear end surface 54 Wing root side 60, 60a Blade removal device 70 Hook 71 Contact part 72 Contact body 73 First protrusion 74 Locking part 75 Second protrusion 76 Arm 77 bass 77a screw hole 77b Connection hole 78 Support part 78a screw shaft 78b screw head 80, 80a Pull-out section 81 First Frame 82 Second Frame 83 Support column 83a Connecting part 84 Impact part 85 Hammer section 86 Hammer body 86a Insertion part 87 Handle 90 Chipping Hammer A. Air F fuel Ar axis Da axial direction Dau axis line first side (axis line upstream side) Dad Axis line second side (axis line downstream side) Dc circumferential direction Dr radial direction Dri radially inward Dro radially outward Dm Groove penetration direction Dm1 Insertion Direction Dm2 fetch direction Dw width direction Ds ネジthrough direction S10 and S100 wing removal method S1 Preparation Project S2 Dusk Return Project S3 Unit Configuration Project S31, S31A フック configuration project S32, S32A Support Department Configuration Project S4 and S4A mobile wing engineering S5 and S5A mobile engineering S6, S6A Judgment Project

Claims

1. A blade removal device for removing a blade from a disk, comprising: The disk is the blade has an outer circumferential surface that spreads in a circumferential direction about an axis, a first end surface facing a first axis side among both sides in the axial direction in which the axis extends, a second end surface facing a second axis side opposite to the first axis side, and a blade root groove, the blade root groove is recessed radially inward from the outer circumferential surface in a radial direction relative to the axis and penetrates from the second end surface to the first end surface, The rotor blade comprises: the blade removal device comprising: a blade body extending in the radial direction and having an airfoil-shaped cross section perpendicular to the radial direction; and a blade root provided radially inside the blade body and fitted into the blade root groove in a state of being inserted from the first axis side toward the second axis side, a hook capable of contacting the rotor blade; a pull-out portion connected to the hook and configured to move the hook in a pull-out direction from the second end surface toward the first end surface; Equipped with The hook is a contact portion capable of coming into contact with the rotor blade from the second axial side in the axial direction; an arm extending from the contact portion in the withdrawal direction, The extraction portion is connected to the arm at a position opposite to the contact portion in the extraction direction, and is capable of applying a load to the hook in the extraction direction. Moving blade removal device.

2. 2. The blade removal device according to claim 1, wherein the hook further includes a support portion that is capable of contacting the blade from the first axial side and that, together with the contact portion, is capable of supporting the blade in a state where it cannot move in the extraction direction.

3. the hook is connected to the arm at a position opposite to the contact portion in the withdrawal direction, and has a base extending perpendicular to the withdrawal direction; The blade removal device according to claim 2 , wherein the support portion is moved relative to the base so as to approach the hook, thereby pressing the blade against the contact portion to pinch and support the blade.

4. The base has a screw hole formed therein. the support portion has a screw shaft that is inserted into the screw hole and is movable relative to the base, The blade removal device according to claim 3 , wherein the screw shaft is movable relative to the base so as to approach the contact portion, thereby being able to contact the blade from the first axis side.

5. The blade removal device according to claim 1 , wherein the extractor is detachable from the hook.

6. The extraction portion is a first frame extending in the pulling direction so as to extend the arm relative to the hook; a second frame connected to the first frame at a position opposite to the hook in the pulling-out direction and extending perpendicular to the pulling-out direction relative to the first frame; The blade removal apparatus of claim 1 , wherein the second frame is adapted to apply the load.

7. The blade removal device according to claim 6 , wherein the load can be applied to the extractor by a chipping hammer.

8. The extraction portion is a support pillar extending in a rod shape in the pulling direction so as to extend the arm relative to the hook; an impact part connected to the support post at a position opposite to the hook in the extraction direction, and extending perpendicular to the extraction direction relative to the support post so as to expand the diameter of the support post; 2. The blade removal device according to claim 1, further comprising: a hammer portion extending perpendicular to the support column in the extraction direction, movable in the extraction direction with the support column inserted therein, and capable of colliding with the impact portion.

9. The blade removal device according to claim 1 , wherein the width of the extraction portion perpendicular to the extraction direction is greater than the width of the contact portion perpendicular to the extraction direction.

10. A blade removal method for removing a blade from a disk, comprising: The disk is the blade has an outer circumferential surface that spreads in a circumferential direction about an axis, a first end surface facing a first axis side among both sides in the axial direction in which the axis extends, a second end surface facing a second axis side opposite to the first axis side, and a blade root groove, the blade root groove is recessed radially inward from the outer circumferential surface in a radial direction relative to the axis and penetrates from the second end surface to the first end surface, The rotor blade comprises: the rotor blade removal method comprising: a blade body extending in the radial direction and having an airfoil-shaped cross section perpendicular to the radial direction; and a blade root provided radially inward of the blade body and fitted into the blade root groove in a state of being inserted from the first axis side toward the second axis side, a preparation step of preparing a blade removal device; an apparatus placement step of placing the blade removal apparatus on the disk; a blade moving step of operating the blade removal device to move the blade attached to the disk; Including, The blade removal device prepared in the preparation step includes: a hook capable of contacting the rotor blade; a pull-out portion connected to the hook and configured to move the hook in a pull-out direction from the second end surface toward the first end surface; Equipped with The hook is a contact portion capable of coming into contact with the rotor blade from the second axial side in the axial direction; an arm extending from the contact portion in the withdrawal direction, the extraction portion is connected to the arm at a position opposite to the contact portion in the extraction direction, and is capable of applying a load to the hook in the extraction direction, In the device arranging step, the hook is brought into contact with the rotor blade from the second axial side in the axial direction, and the withdrawal portion is arranged on the first axial side with respect to the rotor blade, In the blade moving step, the load is applied to the extraction portion, thereby moving the blade in the extraction direction. How to remove moving blades.

11. The extraction portion is a first frame extending in the pulling direction so as to extend the arm relative to the hook; a second frame connected to the first frame at a position opposite to the hook in the pulling-out direction and extending perpendicular to the pulling-out direction relative to the first frame; the second frame is capable of applying the load, The blade removal method according to claim 10 , wherein in the blade moving step, the load is applied to the second frame by a chipping hammer to move the blade in the extraction direction.

12. The extraction portion is a support pillar extending in a rod shape in the pulling direction so as to extend the arm relative to the hook; an impact part connected to the support post at a position opposite to the hook in the extraction direction, and extending perpendicular to the extraction direction relative to the support post so as to expand the diameter of the support post; a hammer portion extending perpendicular to the support column in the extraction direction, movable in the extraction direction with the support column inserted therein, and capable of colliding with the impact portion; 11. The blade removal method according to claim 10, wherein in the blade moving step, the hammer portion is moved in the extraction direction and hits the impact portion, thereby applying the load to the extraction portion and moving the blade in the extraction direction.

Images