JP2015121158A - Stationary blade segment and axial-flow fluid machine provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate the burden of stationary blade assembly work.SOLUTION: A stationary blade segment includes: a plurality of stationary blades 20; a constraint member 40 engaged with radially inward portions of the stationary blades 20 and constraining the radial movement of the stationary blades 20; and a pin 60 constraining the movement of an end stationary blade 20a in a circumferential direction Dc with respect to the constraint member 40. A cylindrical pin insertion hole 49h into which the pin 60 is inserted is formed in the constraint member 40, and a pin groove 29 into which a tip end of the pin 60 is fitted is formed in the end stationary blade 20a. The pin 60 includes an insertion portion 61 formed into a cylindrical shape and inserted into the pin insertion hole 49h; a groove insertion portion 62 formed on one end of the insertion portion 61 and fitted into the pin groove 29; and a flange portion 63 formed on the other end of the insertion portion 61, a size of the flange portion 63 in a direction perpendicular to a pin axis Ap being larger than an inside diameter of the cylindrical pin insertion hole 49h. Part of the flange portion 63 is welded to a surface of the constraint member 40.

Description

  The present invention relates to a vane segment that forms part of a vane ring, and an axial fluid machine including the vane segment.

  The gas turbine includes a compressor that generates compressed air by compressing outside air, a combustor that generates combustion gas by mixing fuel with compressed air, and a turbine that is driven by the combustion gas. .

  Each of the compressor and the turbine is an axial fluid machine, and includes a rotor that rotates about a rotation axis and a casing that covers the rotor. The rotor includes a rotor shaft extending in an axial direction parallel to the rotation axis and a plurality of blade stages fixed to the outer periphery of the rotor shaft and arranged in the axial direction. On the inner peripheral side of the casing, a stationary blade stage is fixed at a position upstream of each blade stage. One stationary blade stage forms a stationary blade ring in which a plurality of stationary blades are connected to each other in the circumferential direction Dc. The stator blade ring is divided in the circumferential direction Dc for the convenience of assembly. Each portion divided in the circumferential direction Dc is generally called a stationary blade segment. The stationary blade segment is configured by connecting a plurality of stationary blades in the circumferential direction Dc.

  For example, a stationary blade segment described in Patent Literature 1 below includes a plurality of stationary blades, a holder for restricting the radial movement of the inner shrouds of the plurality of stationary blades, and the inner shroud of the stationary blades on the holder. And a cylindrical pin to be stopped. The holder has a pin insertion hole penetrating from the radially inner side to the radially outer side. A pin hole that is recessed from the radially inner side to the radially outer side is formed in the inner shroud of the stationary blade. The pin is inserted into the pin insertion hole of the holder and the pin hole of the inner shroud.

  It is considered that the pin inserted into the pin insertion hole of the holder and the pin hole of the inner shroud is prevented from coming off by some method. As such a pin retaining method, for example, there is a method described in Patent Document 2 below. In this method, after a pin is put into a hole of a member, a portion protruding from the hole in the pin is welded to the member.

JP 2007-198293 A (FIG. 2) Japanese Utility Model Publication No. 05-000903 (FIG. 3)

  In the vane segment as described above, it is desired to reduce the burden of the assembly operation of the vane segment while preventing the pin from being removed from the holder (restraining member).

  Therefore, the present invention pays attention to the above-mentioned problem, and includes a stationary blade segment that can reduce the burden of assembly work while preventing the pin that restrains the movement of the stationary blade relative to the restraining member from being removed. An axial flow fluid machine is provided.

The stationary blade segment as one aspect of the invention for solving the above problems is
In a stationary blade segment that forms a part of a stationary blade ring that forms a ring around an axis, a plurality of stationary blades arranged in a circumferential direction with respect to the axis, and a radially inner portion of the plurality of stationary blades with respect to the axis A restraining member that engages and restrains movement of the plurality of stationary blades in the radial direction, and of the stationary blades that are located at both ends of the circumferential direction among the plurality of stationary blades with respect to the restraining member. A pin for restricting movement in the circumferential direction, and the restraining member is formed with a cylindrical pin insertion hole through which the pin is inserted in a portion where the end stationary blade is engaged. Is formed with a pin groove into which a tip end portion of the pin inserted into the pin insertion hole of the restraining member enters, and the pin is formed in a columnar shape around the pin axis and is inserted into the pin insertion hole. Formed at one end of both ends of the insertion portion and the insertion portion, A groove insertion portion that enters the inner groove, a flange portion that is formed at the other end of both ends of the insertion portion, and whose dimension in a direction perpendicular to the pin axis is larger than the inner diameter dimension of the cylindrical pin insertion hole; And at least a part of the flange portion of the pin is inserted into the pin insertion hole and the groove insertion portion of the pin is in the pin groove. The surface of the restraining member is welded to a portion around the pin insertion hole.

  In order to repair the stationary blades constituting the stationary blade segment, when removing the plurality of stationary blades from the restraining member, it is necessary to remove the welded portion between the pin and the restraining member. In the removal of the welded part, a part of the restraining member is removed. In the stator blade segment, since the welded portion between the pin and the restraining member is located at a position away from the pin insertion hole of the restraining member, the pin insertion hole is not included in the portion to be removed from the restraining member. For this reason, in the stationary blade segment, when the stationary blade segment is assembled after the stationary blade is repaired, it is not necessary to repair the pin insertion hole, and the burden of the stationary blade segment assembling operation can be reduced.

  Here, in the stationary blade segment, the restraining member is recessed in the insertion direction that communicates with the pin insertion hole and the pin is inserted into the pin insertion hole from the surface of the restraining member, and can accommodate the flange portion. A flange housing recess may be formed, and the flange portion of the pin may be welded to the bottom surface with the bottom surface of the flange housing recess as a part of the surface of the restraining member.

  In the stationary blade segment, the flange portion that is not inserted into the pin insertion hole of the restraining member in the pin fits in the flange housing recess of the restraining member and does not protrude from the outer surface around the flange housing recess of the restraining member. For this reason, in the said stationary blade segment, the resistance of the fluid which flows the outer side of a restraint member can be reduced.

  In any of the above-described stationary blade segments, the pin groove is defined by having a pair of flat groove side surfaces facing each other in the circumferential direction, and the groove insertion portions of the pins are opposed to each other. A pair of flat groove contact surfaces facing the direction, and one groove contact surface of the pair of groove contact surfaces is in surface contact with one groove side surface of the pair of groove side surfaces, and the pair of groove contact surfaces The other groove contact surface may be in surface contact with the other groove side surface of the pair of groove side surfaces.

  The pin of the stator blade segment has a flat groove contact surface in surface contact with the flat groove side surface of the pin groove. For this reason, this pin supports the load in the shearing direction received from the end vane at the portion including the surface in contact with the groove side surface in the pin. Therefore, in the stationary blade segment, the strength of the pin against the load in the shear direction from the end stationary blade can be increased.

  Further, in the stationary blade segment in which the groove insertion portion has a pair of groove contact surfaces, the flange portion of the pin extends in a direction perpendicular to the pair of groove contact surfaces and has a direction opposite to each other. A pair of facing flat first side surfaces may be formed.

  In the stator blade segment, when the pin is inserted into the pin insertion hole and the pin groove so that the pair of flat first side surfaces of the flange portion face the radial direction, the groove side surface of the pin groove and the groove contact of the holder pin The direction in which the surface spreads coincides. For this reason, in the stator blade segment, the groove insertion portion of the pin can be easily put into the pin of the end stator blade.

  Further, in the stationary blade segment in which a first side surface is formed on the flange portion, a second side surface connected to each of the pair of flat first side surfaces is formed on the flange portion of the pin, The second side surface of the flange portion may be a surface of the restraining member and welded to a portion around the pin insertion hole.

  In any one of the above-described stationary blade segments, the outer diameter size of the cylindrical insertion portion of the pin and the inner diameter size of the cylindrical pin insertion hole of the restraining member are in a relationship of fitting dimensions. May be.

  In the stationary blade segment, when the cylindrical insertion portion of the pin is inserted into the pin insertion hole of the restraining member, the entire outer periphery of the insertion portion is substantially in close contact with the inner surface of the pin insertion hole. For this reason, almost all of the force for moving the pin relative to the restraining member in the direction perpendicular to the pin axis can be received by the inner surface of the pin insertion hole of the restraining member. Therefore, in the stationary blade segment, a force for moving the holder pin relative to the restraining member in the direction perpendicular to the pin axis is hardly applied to the welded portion between the pin and the restraining member. Therefore, in the stationary blade segment, damage to the welded portion between the pin and the restraining member can be suppressed.

  In any one of the above stator blade segments, the welding of the flange portion of the pin and the surface of the restraining member and the portion around the pin insertion hole may be fillet weld.

  Further, in any one of the above-described stationary blade segments, in addition to the inner restraining member as the restraining member that engages the radially inner portion of the plurality of stationary blades with respect to the axis, the plurality of stationary blades You may provide the outer side restraint member which restrains the movement to the said radial direction of the said some stationary blade by engaging the part of the radial direction outer side with respect to an axis.

An axial fluid machine as one aspect of the invention for solving the above problems is
The stator blade ring having a plurality of the stator blade segments of any one of the above, a casing having a cylindrical shape, and the stator blade ring being attached to the inner peripheral side, and rotating around the axis in the casing And a rotor.

  Since the axial flow fluid machine includes the stationary blade segment described above, it is possible to reduce the burden of assembling the stationary blade segment.

  In the present invention, it is possible to reduce the burden of assembling work while preventing the pin that restrains the movement of the stationary blade relative to the restraining member from being pulled out.

It is a principal part notched side view of the gas turbine in one Embodiment which concerns on this invention. It is a front view of a stationary blade ring in one embodiment concerning the present invention. It is a perspective view of a stationary blade segment in one embodiment concerning the present invention. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is the VV sectional view taken on the line in FIG. It is a principal part disassembled perspective view of the stationary blade segment in one Embodiment which concerns on this invention. It is a perspective view of the holder pin in one embodiment concerning the present invention. It is sectional drawing around the holder pin of the stationary blade segment in one Embodiment which concerns on this invention. It is the IX-IX sectional view taken on the line in FIG. It is explanatory drawing which shows the part to which a load is applied with the holder pin of a comparative example. It is explanatory drawing which shows removal of the holder pin of a comparative example. It is explanatory drawing which shows the part to which a load is applied with the holder pin in one Embodiment which concerns on this invention. It is explanatory drawing which shows removal of the holder pin in one Embodiment which concerns on this invention.

  Hereinafter, an embodiment of an axial fluid machine according to the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, the gas turbine includes a compressor 1 that compresses outside air to generate compressed air, and a plurality of combustions that generate combustion gas by mixing the fuel from the fuel supply source with the compressed air and burning it. And a turbine 7 driven by combustion gas.

  The compressor 1 and the turbine 7 are both axial flow fluid machines, and have rotors 2 and 8 that rotate about a rotation axis Ar and casings 5 and 9 that cover the rotors 2 and 8. The compressor rotor 2 and the turbine rotor 8 rotate about the same rotation axis Ar and are connected to each other. The plurality of combustors 6 are fixed to the turbine casing 9. Hereinafter, a direction in which the rotation axis Ar extends is referred to as an axial direction Da. The radial direction with respect to the rotation axis Ar is simply referred to as the radial direction Dr, and the circumferential direction Dc with respect to the rotation axis Ar is simply referred to as the circumferential direction Dc. Further, in the axial direction Da, the compressor 1 side is referred to as an upstream side with respect to the turbine 7, and the turbine 7 side is referred to as a downstream side with respect to the compressor 1.

  The compressor rotor 2 includes a rotor shaft 3 extending in the axial direction Da, and a plurality of moving blade stages 4 fixed to the outer periphery of the rotor shaft 3 and arranged in the axial direction Da. Each blade stage 4 has a plurality of blades fixed to the outer periphery of the rotor shaft 3 side by side in the circumferential direction Dc. On the inner peripheral side of the compressor casing 5, a stationary blade ring 10 is fixed at a position upstream of each moving blade stage 4.

  As shown in FIG. 2, one stationary blade ring 10 is formed by connecting a plurality of stationary blades 20 in a ring. The stationary blade ring 10 is divided in the circumferential direction Dc for the convenience of assembly. Each portion divided in the circumferential direction Dc constitutes the stationary blade segment 11. The stationary blade segment 11 is formed by connecting some stationary blades 20 among the plurality of stationary blades 20 constituting the stationary blade ring 10 side by side in the circumferential direction Dc.

  As shown in FIG. 3, the stationary blade segment 11 includes a plurality of stationary blades 20 arranged in the circumferential direction Dc, and a holder (inner restraining member) 40 to which a radially inner portion of the plurality of stationary blades 20 is attached. And a band (outer restraint member) 50 to which the radially outer portions of the plurality of stationary blades 20 are attached. Among the plurality of stationary blades 20 constituting the stationary blade segment 11, the stationary blades 20 positioned at both ends in the circumferential direction Dc form the end stationary blade 20a, and the stationary blade 20 positioned between the two end stationary blades 20a includes The end blades 20b are formed.

  As shown in FIG. 4, the end-to-end stationary blade 20 b is provided on the wing body 21 extending in the radial direction Dr, the inner shroud 22 provided on the radially inner side of the wing body 21, and on the radially outer side of the wing body 21. An outer shroud 32.

  The inner shroud 22 is provided on the radially inner side of the wing body 21, and has a plate-like shroud main body 23 that extends in the circumferential direction Dc, and an upstream leg 24 that extends radially inward from an upstream portion of the shroud main body 23. An upstream lip 25 extending upstream from the radially inner end of the upstream leg 24, a downstream leg 26 extending radially inward from the downstream portion of the shroud body 23, and the downstream leg 26 And a downstream lip portion 27 that extends downstream from the radially inner end. Between the shroud body 23 and the upstream lip portion 25, an upstream engagement groove 28u that is recessed downstream is formed. Further, between the shroud main body 23 and the downstream side lip portion 27, a downstream side engaging groove 28d that is recessed upstream is formed. The bottom portions of the engaging grooves 28u and 28d are both formed by the leg portions 24 and 26.

  The outer shroud 32 is provided on the radially outer side of the wing body 21 and has a plate-like shroud main body 33 extending in the circumferential direction Dc, and an upstream leg 34 extending radially outward from an upstream portion of the shroud main body 33. An upstream lip 35 extending upstream from the radially outer end of the upstream leg 34, a downstream leg 36 extending radially outward from the downstream portion of the shroud body 33, and the downstream leg 36 And a downstream lip portion 37 that extends downstream from the radially outer end. A band groove 31 is formed between the upstream leg portion 34 and the downstream leg portion 36 so as to be recessed from the radially outer side to the radially inner side and extending in the circumferential direction Dc. A groove bottom portion of the band groove 31 is formed by a shroud main body 33. A part of the band 50 in the circumferential direction Dc enters the band groove 31.

  As shown in FIG. 5, the end stationary blade 20 a is also provided on the radially outer side of the blade body 21, the blade body 21 extending in the radial direction Dr, the inner shroud 22 a provided on the radially inner side of the blade body 21, and the blade body 21. And an outer shroud 32a.

  However, the inner shroud 22a and the outer shroud 32a of the end vane 20a are slightly different from the inner shroud 22a and the outer shroud 32a of the end vane 20b.

  In addition to the configuration of the outer shroud 32 of the end-to-end stator blade 20b, the outer shroud 32a of the end stator blade 20a further includes an upstream flange portion 38 extending downstream from the radially outer end of the upstream leg portion 34; A downstream flange portion 39 extending from the radially outer end of the downstream leg portion 36 to the upstream side. Both the upstream flange portion 38 and the downstream flange portion 39 face the radially outer surface of the band 50 that has entered the band groove 31, and the band 50 that has entered the band groove 31 with respect to the end stationary blade 20 a. Has a role to restrain the relative movement to the outside in the radial direction.

  A cylindrical pin hole 31h that is recessed from the radially outer side to the radially inner side is formed in the band groove 31 of the outer shroud 32a of the end vane 20a.

  As shown in FIGS. 5 to 7, the inner shroud 22 a of the end stationary blade 20 a has a pin groove 29 formed in the upstream lip portion 25 a in addition to the configuration of the inner shroud 22 of the end-to-end stationary blade 20 b. . The pin groove 29 is formed by cutting a part of the upstream lip portion 25a from the upstream side toward the downstream side. The pin groove 29 is defined by a pair of flat groove side surfaces 29a facing each other in the circumferential direction Dc.

  As shown in FIGS. 3 to 5, the band 50 is a rectangular plate extending in the circumferential direction Dc. The width of the band 50 in the axial direction Da corresponds to the width of the band groove 31 in the axial direction Da so that the band 50 can enter the band groove 31 of the outer shrouds 32 and 32a. The length of the band 50 in the circumferential direction Dc is such that the plurality of stationary blades 20 constituting the stationary blade segment 11 are arranged in the circumferential direction Dc in the circumferential direction Dc of the band groove 31 of each stationary blade 20. Corresponds to the total length.

  On both ends of the band 50 in the circumferential direction Dc, cylindrical pin insertion holes 51 penetrating in the radial direction Dr are formed. The positions of the pin insertion holes 51 in the circumferential direction Dc and the axial direction Da are such that the plurality of stationary blades 20 constituting the stationary blade segment 11 are arranged in the circumferential direction Dc, and the band 50 enters the band groove 31 of each stationary blade 20. In the state, in this band 50, it is a position corresponding to the pin hole 31h of the end stationary blade 20a.

  The holder 40 includes a seal holding portion 43 extending in the circumferential direction Dc, an upstream leg portion 44 formed along the upstream edge of the seal holding portion 43 and extending radially outward, and a radially outer end of the upstream leg portion 44. An upstream flange portion 45 extending downstream from the inner shroud 22 and entering the upstream engagement groove 28 u of the inner shroud 22, 22 a, and a downstream leg portion 46 formed along the downstream edge of the seal holding portion 43 and extending radially outward. And a downstream flange 47 that extends upstream from the radially outer end of the downstream leg 46 and enters the downstream engagement groove 28d of the inner shrouds 22 and 22a. A seal device 48 that seals between the rotor shaft 3 (FIG. 1) of the compressor rotor 2 is provided on the radially inner side of the seal holding portion 43. A shroud accommodation groove 41 is formed between the upstream leg 44 and the downstream leg 46 so as to be recessed radially inward and extending in the circumferential direction Dc. A groove bottom portion of the shroud storage groove 41 is formed by a seal holding portion 43. In the shroud storage groove 41, the upstream leg 24 of the inner shrouds 22, 22 a of each stationary blade 20, the upstream side in a state where a plurality of stationary blades 20 constituting the stationary blade segment 11 are arranged in the circumferential direction Dc. The lip portions 25 and 25a, the downstream leg portion 26, and the downstream lip portion 27 enter.

  As shown in FIGS. 6, 8, and 9, the upstream flange portion 45, the upstream leg portion 44, and the seal holding portion 43 of the holder 40 are provided on both upstream and downstream surfaces in the circumferential direction Dc. A flange housing recess 49 that is recessed to the side is formed. The upstream leg portion 44 of the holder 40 is further formed with a cylindrical pin insertion hole 49h penetrating from the bottom surface of the flange housing recess 49 to the downstream side. The positions of the pin insertion holes 49h in the circumferential direction Dc and the radial direction Dr are such that the plurality of stationary blades 20 constituting the stationary blade segment 11 are arranged in the circumferential direction Dc, and the upstream leg portions of the inner shrouds 22 and 22a of each stationary blade 20 24, the downstream leg 26, etc. are in a position corresponding to the pin groove 29 of the end stationary blade 20a.

  As shown in FIGS. 3 and 5, the stationary blade segment 11 of the present embodiment further has a band pin 55 that restrains the movement of the end stationary blade 20 a in the circumferential direction Dc relative to the band 50, and the holder 40. And a holder pin 60 that restrains movement of the end stationary blade 20a in the circumferential direction Dc.

  The band pin 55 has an insertion part that can be inserted into the pin insertion hole 51 of the band 50 and a hole insertion part that enters the pin hole 31h of the end stationary blade 20a. The band pin 55 is inserted in the pin insertion hole 51 of the band 50 and the hole insertion part is inserted into the pin hole 31h of the end stationary blade 20a, for example, radially outward from the pin insertion hole 51. The protruding portion is fillet welded to the band 50 and is prevented from coming off from the pin insertion hole 51.

  As shown in FIGS. 6 to 9, the holder pin 60 has a columnar shape centered on the pin axis Ap and is inserted into the pin insertion hole 49 h of the holder 40, and both ends of the insertion part 61 in the pin axis direction. Are formed at one end, and are formed at a groove insertion portion 62 that enters the pin groove 29 of the end stationary blade 20a, and at the other end of both ends of the insertion portion 61, and has a dimension in a direction perpendicular to the pin axis Ap. And a flange portion 63 larger than the inner diameter of the cylindrical pin insertion hole 49h.

  The outer diameter dimension of the cylindrical insertion part 61 of the holder pin 60 and the inner diameter dimension of the pin insertion hole 49h of the holder 40 through which the insertion part 61 is inserted are related to the fitting dimension, more specifically, the dimension of the intermediate fitting. It has become a relationship. For this reason, when the columnar insertion portion 61 of the holder pin 60 is inserted into the pin insertion hole 49h of the holder 40, the entire outer periphery of the insertion portion 61 is substantially in close contact with the inner surface of the pin insertion hole 49h.

  The groove insertion portion 62 of the holder pin 60 is formed with a pair of flat groove contact surfaces 62a that face each other in a direction perpendicular to the pin axis Ap. When the groove insertion portion 62 enters the pin groove 29 of the holder 40, one groove contact surface 62a of the pair of groove contact surfaces 62a comes into surface contact with one groove side surface 29a of the pair of groove side surfaces 29a, and a pair of groove contacts The other groove contact surface 62a of the surface 62a is in surface contact with the other groove side surface 29a of the pair of groove side surfaces 29a.

  The flange portion 63 includes a pair of flat first side surfaces 63a extending in a direction perpendicular to the pin axis Ap and the groove contact surface 62a and facing each other, and a pair of first side surfaces 63a. A connected second side face 63b is formed. Like the pair of first side surfaces 63a, the flange portion 63 has a pair of second side surfaces 63b. Of the pair of second side surfaces 63b, one second side surface 63b connects the ends on one side of the pair of first side surfaces 63a. The other second side surface 63b connects the other ends of the pair of first side surfaces 63a. The pair of second side surfaces 63b form an arcuate curved surface. The maximum mutual distance dimension between the pair of second side surfaces 63b and the mutual distance dimension between the pair of first side surfaces 63a are both larger than the inner diameter dimension of the pin insertion hole 49h of the holder 40. Moreover, the maximum mutual space | interval dimension of a pair of 2nd side surface 63b is larger than the mutual space | interval dimension of a pair of 1st side surface 63a. The thickness dimension, which is the dimension of the flange portion 63 in the pin axis direction, is substantially the same as or slightly smaller than the depth dimension of the flange housing recess 49 of the holder 40.

  9, the holder pin 60 is inserted into the pin insertion hole 49h and the groove insertion portion 62 is inserted into the pin groove 29. As shown in FIG. The side surface 63b is fillet welded to the bottom surface of the flange housing recess 49, and is prevented from coming off from the pin insertion hole 49h.

  Next, the manufacturing procedure of the stationary blade segment 11 described above will be described.

  First, the plurality of stationary blades 20, the holder 40, the band 50, the holder pin 60, and the band pin 55 described above are prepared.

  Next, as shown in FIGS. 4 to 6, the inner shrouds 22 and 22 a of the plurality of stationary blades 20 are attached to the holder 40. At this time, first, the inner shroud 22a of one end stationary blade 20a is mounted on the holder 40, and then the inner shroud 22 of the other end stationary blade 20b adjacent to the end stationary blade 20a in the circumferential direction Dc is held in the holder. Attach to 40. Thereafter, the inner shroud 22 of the other end-to-end stator blade 20b adjacent in the circumferential direction Dc is mounted on the holder 40 sequentially. Finally, the inner shroud 22a of the remaining one end stationary blade 20a is mounted on the holder 40.

  When the inner shrouds 22, 22 a of the stationary blade 20 are mounted on the holder 40, the inner shrouds 22, 22 a are moved relative to the holder 40 in the circumferential direction Dc, and the inner shroud 41 is inserted into the shroud housing groove 41 of the holder 40. The upstream leg 24, the upstream lip 25, 25a, the downstream leg 26, and the downstream lip 27 of 22 and 22a are inserted.

  As a result, the radially inner surface of the shroud body 23 of the inner shrouds 22, 22 a faces the radially outer surface of the upstream flange portion 45 and the downstream flange portion 47 of the holder 40. Further, the radially outer surface of the upstream lip portions 25, 25 a of the inner shrouds 22, 22 a faces the radially inner surface of the upstream flange portion 45 of the holder 40. Furthermore, the radially outer surface of the downstream lip portion 27 of the inner shrouds 22, 22 a faces the radially inner surface of the downstream flange portion 47 of the holder 40. For this reason, the inner shrouds 22 and 22a cannot move relative to the holder 40 in the radial direction Dr. Further, the groove bottom surface in the upstream engagement groove 28u of the inner shrouds 22, 22a faces the downstream end surface of the upstream flange portion 45 of the holder 40, and the groove bottom surface in the downstream engagement groove 28d of the inner shrouds 22, 22a It faces the upstream end face of the downstream flange portion 47 of the holder 40. For this reason, the inner shrouds 22 and 22a cannot move relative to the holder 40 in the axial direction Da.

  That is, when the inner shrouds 22, 22 a of the stationary blade 20 are attached to the holder 40, the stationary blade 20 becomes immovable relative to the holder 40 in the radial direction Dr and the axial direction Da. When the inner shrouds 22 and 22a of the plurality of stationary blades 20 are mounted on the holder 40, the plurality of stationary blades 20 are aligned in the circumferential direction Dc with the mutual positions in the radial direction Dr and the axial direction Da matching. It will be. When the plurality of stationary blades 20 are arranged in the circumferential direction Dc, one groove is formed in which the band grooves 31 of each stationary blade 20 are continuous in the circumferential direction Dc.

  Next, the insertion portion 61 of the holder pin 60 is inserted into the pin insertion hole 49h of the holder 40, and the groove insertion portion 62 of the holder pin 60 is inserted into the pin groove 29 of the end stationary blade 20a. As a result, the end stationary blade 20a cannot move relative to the holder 40 in the circumferential direction Dc. When the two end stationary blades 20a cannot move relative to the holder 40 in the circumferential direction Dc, the plurality of end stationary blades 20b existing between the two end stationary blades 20a also move in the circumferential direction Dc with respect to the holder 40. Relative movement.

  Next, in order to prevent the holder pin 60 from coming off from the pin insertion hole 49h of the holder 40, the second side surface 63b of the flange portion 63 of the holder pin 60 is connected to the flange housing recess 49 of the holder 40 as described above with reference to FIG. Weld fillet on the bottom. Thus, the attachment of the plurality of stationary blades 20 to the holder 40 is completed.

  Next, the band 50 is put into one groove in which the band groove 31 of each stationary blade 20 is continuous in the circumferential direction Dc. At this time, the band 50 is moved relative to the band groove 31 of each stationary blade 20 in the circumferential direction Dc, and the band 50 is inserted into each band groove 31. The pin hole 31h of one end stator blade 20a of the two end stator blades 20a matches the position of one pin insertion hole 51 of the band 50, and the pin hole 31h of the remaining one end stator blade 20a. However, when the position of the remaining one pin insertion hole 51 of the band 50 coincides, the band 50 is completely contained in this groove.

  When the band 50 completely fits in the groove, as shown in FIGS. 4 and 5, the upstream end face of the band 50 is the downstream face of the upstream leg 34 of the outer shroud 32, 32 a of each stationary blade 20. Opposite to. Further, the downstream end face of the band 50 faces the upstream face of the downstream leg 36 of the outer shrouds 32, 32 a of each stationary blade 20. For this reason, the outer shrouds 32, 32 a of each stationary blade 20 are substantially immovable relative to the band 50 in the axial direction Da. Further, the radially outer surface of the band 50 faces the radially inner side surface of the upstream flange portion 38 and the downstream flange portion 39 of each end stationary blade 20a. For this reason, with respect to the outer shrouds 32 and 32a of the plurality of stationary blades 20, the band 50 is substantially immovable relative to the side away from the radial direction Dr (outward in the radial direction). In other words, the outer shrouds 32 and 32a of the plurality of stationary blades 20 are substantially immovable relative to the band 50 on the side approaching the radial direction Dr (inward in the radial direction).

  Next, the insertion part of the band pin 55 is inserted into the pin insertion hole 51 of the band 50, and the hole insertion part of the band pin 55 is inserted into the pin hole 31h of the end stationary blade 20a. As a result, the end stationary blade 20a cannot move relative to the band 50 in the circumferential direction Dc. When the two end stator blades 20a cannot move relative to the band 50 in the circumferential direction Dc, the plurality of end blades 20b existing between the two end stator blades 20a also move in the circumferential direction Dc with respect to the band 50. Relative movement becomes impossible.

  Next, in order to prevent the band pin 55 from coming out of the pin insertion hole 51 of the band 50, a portion of the band pin 55 that protrudes radially outward from the pin insertion hole 51 is fillet welded to the band 50. Thus, the attachment of the plurality of stationary blades 20 to the band 50 is completed, and the stationary blade segment 11 is completed.

  In the above, after the holder pin 60 is welded to the holder 40, the band 50 is put in the band groove 31 of each stationary blade 20. However, the holder pin 60 may be welded to the holder 40 before and after the band pin 55 is welded to the band 50 after the band 50 is inserted into the band groove 31 of each stationary blade 20.

  Next, before describing the effect of the stationary blade segment described above, a comparative example of the holder pin 60 will be described with reference to FIGS. 10 and 11.

  The holder pin 60x of the comparative example has a cylindrical shape centered on the pin axis Ap as a whole. The outer diameter of the holder pin 60x substantially coincides with the groove width of the pin groove 29 of the end stationary blade 20a. The holder pin 60x is inserted into the pin insertion hole 49h of the holder 40, and the first end 62x enters the pin groove 29 of the end stationary blade 20a. At this time, the second end 63x opposite to the first end 62x of the holder pin 60x protrudes from the pin insertion hole 49h. The holder pin 60x is spot-welded or fillet-welded at the second end to the holder 40 in order to prevent the holder pin 60x from coming off from the pin insertion hole 49h.

  In the comparative example, in order to repair the stationary blades constituting the stationary blade segment, when removing the plurality of stationary blades from the holder 40, the welded portion 69 between the holder pin 60x and the holder 40 is removed as shown in FIG. At this time, the portion including the pin insertion hole 49h of the holder 40 is removed together with the second end 63x of the holder pin 60x. For this reason, when assembling the stationary blade segment after repairing the stationary blade, for example, first, overlay welding or the like is performed on a portion around the pin insertion hole 49h of the holder 40 removed when the stationary blade segment is disassembled. Then, the inner peripheral surface of the pin insertion hole 49h, including the welded portion, is finished cleanly.

  Thus, in the holder pin 60x of the comparative example, after the stator blade is repaired, when the stator blade segment is assembled, it is necessary to repair the pin insertion hole 49h of the holder 40, which takes time and effort for assembly.

  Further, since the holder pin 60x of this comparative example has a cylindrical shape also in the portion into the pin groove 29 of the end vane 20a, as shown in FIG. 10, a pair of flat groove side surfaces 29a of the holder pin 60x and the pin groove 29 are provided. Is substantially in line contact. For this reason, the holder pin 60x receives the load in the shearing direction from the end stationary blade 20a at the surface portion 65x including a line in contact with the pair of groove side surfaces 29a in the holder pin 60x.

  For this reason, the holder pin 60x of the comparative example has low strength against the load in the shear direction from the end stationary blade 20a.

  Next, the effect of the stationary blade segment of this embodiment will be described.

  In the holder pin 60 of this embodiment, a flange portion 63 is formed at the end of the insertion portion 61 of the holder pin 60. In the present embodiment, as described above with reference to FIG. 9, the flange portion 63 of the holder pin 60 is fillet welded to the holder 40. Also in this embodiment, in order to repair the stationary blades constituting the stationary blade segment, when removing a plurality of stationary blades from the holder 40, the welded portion 69 between the holder pin 60 and the holder 40 is removed as shown in FIG. To do. However, in the present embodiment, the portion to be welded is the position away from the pin insertion hole 49h of the holder 40, and therefore the portion to be removed does not include the pin insertion hole 49h.

  For this reason, in this embodiment, when the stationary blade segment 11 is assembled after repairing the stationary blade 20, it is not necessary to repair the pin insertion hole 49h as in the comparative example, and the stationary blade segment 11 is assembled. Can be reduced.

  Further, in the holder pin 60 of the present embodiment, a pair of flat groove contact surfaces 62 a are formed in the groove insertion portion 62 that enters the pin groove 29 of the end stationary blade 20 a, and this groove contact surface 62 a is a pair of the pin grooves 29. In contact with the flat groove side surface 29a. For this reason, as shown in FIG. 12, the holder pin 60 of the present embodiment has a substantially rectangular parallelepiped-shaped portion 65 including a surface in contact with the pair of groove side surfaces 29a in the holder pin 60 that receives a load in the shear direction received from the end stationary blade 20a. It will be received at.

  For this reason, in this embodiment, the part 65 which receives the load of the shear direction from the end stationary blade 20a in the part which enters in the pin groove | channel 29 in the holder pin 60 becomes larger than the holder pin 60 of a comparative example. Therefore, the holder pin 60 of the present embodiment has the same cross-sectional area as the holder pin 60x of the comparative example even though the cross-sectional area perpendicular to the pin axis Ap of the portion that enters the pin groove 29 in the holder pin 60 is the same. Thus, the strength against the load in the shear direction from the end stationary blade 20a can be increased.

  The pair of groove side surfaces 29a that define the pin groove 29 of the end stationary blade 20a in the present embodiment are surfaces perpendicular to the circumferential direction Dc. In the present embodiment, as described above, in order to increase the strength against the load in the shearing direction from the end stationary blade 20a, a pair of flat groove contacts are made on the groove insertion portion 62 that enters the pin groove 29 of the end stationary blade 20a. A surface 62 a is formed, and the groove contact surface 62 a is in surface contact with a pair of flat groove side surfaces 29 a of the pin groove 29. For this reason, in this embodiment, it is necessary to insert the holder pin 60 into the pin insertion hole 49h of the holder 40 so that the direction in which the groove side surface 29a of the pin groove 29 expands and the direction in which the groove contact surface 62a of the holder pin 60 expands coincide. There is.

  The flange portion 63 of the holder pin 60 of the present embodiment is formed with a pair of flat first side surfaces 63a that extend in a direction perpendicular to the groove contact surface 62a of the holder pin 60 and face each other. . Therefore, when the holder pin 60 is inserted into the pin insertion hole 49h and the pin groove 29 so that the pair of flat first side surfaces 63a of the flange portion 63 faces the radial direction Dr, the groove side surface 29a of the pin groove 29 expands. The direction in which the groove contact surface 62a of the holder pin 60 extends coincides. That is, the pair of flat first side surfaces 63a in the flange portion 63 of the holder pin 60 is a mark that determines the direction in which the pair of groove side surfaces 29a of the holder pin 60 expands. For this reason, in this embodiment, the groove insertion part 62 of the holder pin 60 can be easily put in the pin groove 29 of the end stationary blade 20a.

  As described above, the outer diameter size of the cylindrical insertion portion 61 of the holder pin 60 and the inner diameter size of the pin insertion hole 49h of the holder 40 through which the insertion portion 61 is inserted have a relationship of the fitting size. For this reason, when the cylindrical insertion portion 61 of the holder pin 60 is inserted into the pin insertion hole 49h of the holder 40, the entire outer periphery of the insertion portion 61 is substantially in close contact with the inner surface of the pin insertion hole 49h. For this reason, almost all of the force for moving the holder pin 60 relative to the holder 40 in the direction perpendicular to the pin axis Ap can be received by the inner surface of the pin insertion hole 49 h of the holder 40. Therefore, the welding portion 69 between the holder pin 60 and the holder 40 hardly receives a force for moving the holder pin 60 relative to the holder 40 in the direction perpendicular to the pin axis Ap. Therefore, in this embodiment, damage to the welded portion 69 between the holder pin 60 and the holder 40 can be suppressed.

  Further, in the holder pin 60 of the present embodiment, the flange portion 63 that is not inserted into the pin insertion hole 49h of the holder 40 is housed in the flange housing recess 49 that is recessed in the insertion direction of the holder pin 60, and from the outer surface of the holder 40. It does not protrude. For this reason, in this embodiment, the resistance of the air flowing outside the holder 40 can be reduced. In other words, in this embodiment, the windage loss in the compressor can be suppressed.

"Modification"
A modification of the stationary blade segment described above will be described.

  In the above embodiment, the shape of the band pin 55 is not particularly described, but the band pin 55 may also be provided with a flange portion in the same manner as the holder pin 60.

  In the above embodiment, the outer peripheral side portions of the plurality of stationary blades are connected to each other by the band 50 and the band pin 55, but the outer peripheral side portions of the plurality of stationary blades may be connected by other methods.

  In the above embodiment, the example of the stationary blade segment 11 of the compressor 1 has been described. However, the present invention is not limited to this, and the present invention is applied to the stationary blade segment of another axial flow fluid machine such as a turbine. You may apply.

  1: compressor, 2: compressor rotor, 4: moving blade stage, 5: compressor casing, 6: combustor, 7: turbine, 10: stationary blade ring, 11: stationary blade segment, 20: stationary blade, 20a : End vane, 20b: End vane, 21: Blade body, 22, 22a: Inner shroud, 29: Pin groove, 29a: Groove side surface, 31: Band groove, 32, 32a: Outer shroud, 40: Holder ( 49: flange insertion recess, 49h: pin insertion hole, 50: band (outer restriction member), 55: band pin, 60: holder pin, 61: insertion portion, 62: groove insertion portion, 62a: groove contact Surface, 63: flange portion, 63a: first side surface, 63b: second side surface, 69: welded portion

Claims (9)

In the vane segment that forms a part of the vane ring that forms a ring around the axis,
A plurality of stationary blades arranged in a circumferential direction with respect to the axis;
A restraining member that engages a radially inner portion of the plurality of stationary blades with respect to the axis, and restrains movement of the plurality of stationary blades in the radial direction;
A pin for restraining the circumferential movement of the end stationary blades located at both ends in the circumferential direction among the plurality of stationary blades with respect to the restraining member;
With
In the restraining member, a cylindrical pin insertion hole through which the pin is inserted is formed in a portion where the end stationary blade is engaged,
The end stator blade is formed with a pin groove into which a tip portion of the pin inserted into the pin insertion hole of the restraining member enters,
The pin is formed in a columnar shape around a pin axis and is inserted into the pin insertion hole, formed at one end of both ends of the insertion portion, and a groove insertion portion that enters the pin groove, A flange portion formed at the other end of both ends of the insertion portion, and having a dimension in a direction perpendicular to the pin axis that is larger than the inner diameter size of the cylindrical pin insertion hole;
In a state where the insertion portion of the pin is inserted into the pin insertion hole and the groove insertion portion of the pin is in the pin groove, at least a part of the flange portion of the pin is a surface of the restraining member. And welded to a portion around the pin insertion hole,
Stator blade segment. The stator vane segment of claim 1,
The constraining member has a flange housing recess that can communicate with the pin insertion hole and is recessed from the surface of the constraining member in the insertion direction in which the pin is inserted into the pin insertion hole.
The bottom surface of the flange housing recess is part of the surface of the restraining member, and the flange portion of the pin is welded to the bottom surface.
Stator blade segment. The vane segment according to claim 1 or 2,
The pin groove is defined having a pair of flat groove side surfaces facing each other in the circumferential direction,
The groove insertion portion of the pin has a pair of flat groove contact surfaces facing in opposite directions, and one groove contact surface of the pair of groove contact surfaces is one groove of the pair of groove side surfaces. Surface contact with the side surface, the other groove contact surface of the pair of groove contact surfaces is in surface contact with the other groove side surface of the pair of groove side surfaces,
Stator blade segment. The stator vane segment according to claim 3,
The flange portion of the pin is formed with a pair of flat first side surfaces extending in a direction perpendicular to the pair of groove contact surfaces and facing each other.
Stator blade segment. The stator vane segment according to claim 4,
The flange part of the pin has a second side surface connected to each of the pair of flat first side surfaces,
The second side surface of the flange portion is a surface of the restraining member and is welded to a portion around the pin insertion hole;
Stator blade segment. In the stationary blade segment according to any one of claims 1 to 5,
The outer diameter size of the cylindrical insertion portion of the pin and the inner diameter size of the cylindrical pin insertion hole of the restraining member are in a relationship of fitting dimensions.
Stator blade segment. In the stationary blade segment according to any one of claims 1 to 6,
The welding of the flange portion of the pin and the portion around the pin insertion hole on the surface of the restraining member is fillet welding,
Stator blade segment. In the stationary blade segment according to any one of claims 1 to 7,
In addition to the inner restraint member as the restraining member that engages the radially inner portion of the plurality of stationary blades with respect to the axis, the radial blade engages with the radially outer portion of the plurality of stationary blades with respect to the axis, An outer restraining member that restrains movement of the plurality of stationary blades in the radial direction,
Stator blade segment. The stator blade ring having a plurality of stator blade segments according to any one of claims 1 to 8,
A casing having a cylindrical shape and the stationary blade ring attached to the inner peripheral side;
A rotor that rotates about the axis in the casing;
An axial flow fluid machine equipped with.

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