Positioning device, rotary machine with same, and positioning method

A pin insertion hole is formed in an outer member, and a pin groove is formed in an inner member. A positioning device includes a pin entering the pin insertion hole and the pin groove, and a groove contact member coming in contact with a groove side surface of the pin groove. In one member of the pin and the groove contact member, a position restriction concave portion recessed in a direction away from the other member is formed in a portion facing the other member. In the other member, a claw portion entering the position restriction concave portion and coming into contact with the position restriction concave portion is formed as a portion of the other member is plastically deformed.

TECHNICAL FIELD

The present invention relates to a positioning device that positions an inner member arranged on an inner circumferential side of an outer member and extending in a circumferential direction around an axis with respect to the outer member extending in the circumferential direction around the axis, a rotary machine with the positioning device, and a positioning method.

Priority is claimed on Japanese Patent Application No. 2015-030418, filed Feb. 19, 2015, the content of which is incorporated herein by reference.

BACKGROUND ART

A rotary machine such as a steam turbine, a gas turbine, or a compressor includes a rotor shaft, an outer member such as a casing, and an inner member. The outer member extends m a circumferential direction around the rotor shaft. The inner member is arranged on the inner circumferential side of the outer member and extends in a circumferential direction around the rotor shaft. In such a rotary machine, a positioning device may be used to align a relative position of the inner member with respect to the rotor shaft of which a relative position with respect to the outer member is determined.

Examples of such a positioning device include a device disclosed in Patent Document 1. The positioning device includes a radial pin, a liner, and a bolt. The radial pin enters a pin insertion hole of a casing that is an outer member and a groove of a blade ring that is an inner member. The linens arranged between a distal end portion of the radial pin and a groove side surface of the groove. The bolt fixes the liner to the distal end portion of the radial pin. A groove contact surface in contact with the groove side surface and a pin contact surface in contact with the distal end portion of the radial pin are formed in the liner. Further, a screw insertion hole and a bolt head accommodation concave portion are formed in the liner. The screw insertion hole penetrates from the groove contact surface to the pin contact surface, and a screw portion of the bolt is inserted into the screw insertion hole. The bolt head accommodation concave portion communicates with the screw insertion hole, and a bolt head portion of the bolt is accommodated therein.

CITATION LIST

Patent Document

SUMMARY OF INVENTION

Technical Problem

As described above, the positioning device of the technology described in Patent Document 1 includes the radial pin, the liner in which the screw insertion hole, the bolt head accommodation concave portion, and the like are formed, and the bolt that fixes the liner to the radial pin. It is desired to reduce the number of components constituting the apparatus for any apparatus including such a positioning device.

Therefore, an object of the present invention is to provide a positioning device in which the number of components is able to be reduced, a rotary machine including the positioning device, and a positioning method.

The positioning device as a first aspect of the present invention for achieving the above object is a positioning device that positions an inner member arranged on an inner circumferential side of an outer member and extending in a circumferential direction around an axis with respect to the outer member extending in the circumferential direction around the axis, the positioning device including: a pin that enters a pin insertion hole extending from the inner circumferential side to an outer circumferential side of the outer member, and a groove recessed from an outer circumferential side to an inner circumferential side of the inner member; and a groove contact member attached to the pin and coming into contact with a groove side surface of the groove, wherein in one member of the pin and the groove contact member, a position restriction concave portion that is recessed in a direction away from the other member is formed in a portion facing the other member, and a claw portion that enters the position restriction concave portion and comes in contact with the position restriction concave portion is formed in the other member as a portion of the other member is plastically deformed.

In this positioning device, after the pin and the groove contact member are placed so as to lace each other, the portion of the other member is plastically deformed so that this portion enters, as a claw portion, the position restriction concave portion of one member and comes into contact with the position restriction concave portion. As a result, relative movement between the pin and the groove contact member is restricted. Therefore, in the positioning device, a member such as a bolt for fixing the member in contact with the groove side surface of the groove of the inner member to the pin is unnecessary, and the number of components can be reduced.

According to a positioning device as a second aspect of the present invention for achieving the above object, in the positioning device of the first aspect, the pin includes an insertion portion that is inserted into the pin insertion hole of the outer member, and a groove insertion portion that enters the groove of the inner member; the insertion portion forms a columnar shape that is long in a pin axis direction parallel to a pin axis around the pin axis; the groove insertion portion is formed on a distal end side that is one side in the pin axis direction of the insertion portion; a support surface parallel to the pin axis is formed in the groove insertion portion; and a supported surface facing the support surface of the groove insertion portion is formed in the groove contact member.

According to a positioning device as a third aspect of the present invention for achieving the above object, in the positioning device of the second aspect, a tapered reception surface facing a side of the support surface and gradually extending toward the distal end side as the tapered reception surface extends away from the support surface is formed on the distal end side in the insertion portion, and a tapered contact surface that comes into surface contact with the tapered reception surface of the insertion portion is formed in the groove contact member.

In this positioning device, the tapered reception surface gradually extending toward the distal end side as the tapered reception surface extends away from the support surface is formed on the distal end side of the insertion portion of the pin, and the tapered contact surface coming in surface contact with the tapered reception surface is formed in the groove contact member. Therefore, in the positioning device, it is possible to restrict relative movement of the groove contact member with respect to the pin to the base end side opposite to the distal end side in the pin axial direction. Further, in the positioning device, it is possible to restrict relative movement of the groove contact member toward the side away from the support surface of the pin. Therefore, in the positioning device, it is possible to further restrict relative movement of the groove contact member with respect to the pin in conjunction with restriction of relative movement of the groove contact member with respect to the pin by the position restriction concave portion and the claw portion entering the position restriction concave portion.

The support surface of the pin receives a force from the inner member via the supported surface of the groove contact member. Therefore, it is preferable for an area of the support surface and an area of the supported surface to be large in order to withstand the force received from the inner member. In this positioning device, it is not necessary to form a bolt hole into which the bolt is inserted in the support surface of the pin and the supported surface of the groove contact member. Therefore, in the positioning device, it is possible to increase the areas of the support surface of the pin and the supported surface of the groove contact member without changing widths or the like of the support surface of the pin and the supported surface of the groove contact member in contrast with a case in which the bolt hole is formed.

According to a positioning device as a fourth aspect of the present invention for achieving the above object, in the positioning device of the second or third aspect, a facing surface facing a surface of the groove contact member among surfaces of the groove insertion portion, an exposed surface other than the facing surface among the surfaces of the groove insertion portion, and a corner between the facing surface and the exposed surface are formed in the groove insertion portion, and a facing surface facing a surface of the pin among surfaces of the groove contact member, an exposed surface other than the facing surface among the surfaces of the groove contact member, and a corner between the facing surface of the groove contact member and the exposed surface of the groove contact member are formed in the groove contact member, and the position restriction concave portion is formed in a region including the corner of the one member.

In this positioning device, since the position restriction concave portion is formed at the corner of the one member, the position restriction concave portion can be easily formed.

According to a positioning device as a fifth aspect of the present invention for achieving the above object, in the positioning device of the fourth aspect, the exposed surface of the groove insertion portion includes a distal end surface that is formed on the distal end side of the groove insertion portion and is directed to the distal end side; the exposed surface of the groove contact member includes a distal end surface that is formed on the distal end side of the groove contact member and is directed to the distal end side; and the position restriction concave portion is formed in a region including a corner between the distal end surface and the facing surface of the one member.

In this positioning device, it is possible to mainly restrict the movement of the groove contact member on the distal end side thereof using the position restriction concave portion and the claw portion entering the position restriction concave portion. Further, it is possible to mainly restrict the movement of the groove contact member on the base end side thereof using the tapered reception surface formed on the distal end side of the insertion portion of the pin, in other words, on the base end side of the groove insertion portion of the pin, and the tapered contact surface of the groove contact member in surface contact with the tapered reception surface, as described above. Therefore, in the positioning device, it is possible to restrict relative movement of the groove contact member with respect to the pin, on both the distal end side and the base end side of the groove contact member.

According to a positioning device as a sixth aspect of the present invention for achieving the above object, in the positioning device of the fourth or fifth aspect, a concave surface defining the position restriction concave portion forms a portion of an outer circumferential surface of a virtual cylinder centered on a virtual axis that is inclined with respect to both of the facing surface and the exposed surface of the one member.

In this positioning device, the position restriction concave portion can be formed by linearly moving a cylindrical tool in a direction inclined with respect to both of the facing surface and the exposed surface of the one member. Therefore, in the positioning device, the position restriction concave portion can be easily formed. Further, in the positioning device, it is easy to bring the claw portion of the pin into close contact over a wide area of the position restriction concave portion, and the direction of position restriction of the groove contact member using the claw portion of the pin can be set to various directions.

According to a positioning device as a seventh aspect of the present invention for achieving the above object, in the positioning device of any one of the second to sixth aspects, a first engaged portion that is formed on the distal end side of the groove contact member, extends from the distal end surface directed to the distal end side to a base end side opposite to the distal end side, and has a convex shape with respect to the supported surface is formed in the groove contact member; a first engaging portion that is formed on the distal end side of the groove insertion portion, extends from the distal end surface directed to the distal end side to the base end side, and has a concave shape with respect to the support surface is formed in the groove insertion portion; the first engaged portion includes a base end side engaged portion of which the amount of projection with respect to the supported surface is a predetermined amount of projection, and a distal end side engaged portion that is arranged on the distal end side relative to the base end side engaged portion and of which the amount of projection with respect to the supported surface is larger than the predetermined amount of projection; the first engaging portion includes a base end size engaging portion of which the amount of recess with respect to the support surface is a predetermined amount of recess that allows the base end side engaged portion to enter the base end side engaging portion, and a distal end side engaging portion that is arranged on the distal end side relative to the base end side engaging portion and of which the amount of recess with respect to the support surface is an amount of recess that allows the distal end side engaged portion to enter the distal end side engaging portion; and the position restriction concave portion is formed in one of a region including the distal end surface and the distal end side engaging portion of the groove insertion portion, and a region including the distal end surface and the distal end side engaged portion of the groove contact member.

According to a positioning device as an eighth aspect of the present invention for achieving the above object, in the positioning device of any one of the second to sixth aspects, an engaging portion that forms a convex shape or a concave shape with respect to the support surface is formed in the groove insertion portion, and an engaged portion that forms a concave shape or a convex shape with respect to the supported surface and is engaged with the engaging portion is formed in the groove contact member.

In this positioning device, it is possible to restrict relative movement of the groove contact member with respect to the pin by engaging the engaging portion of the groove insertion portion with the engaged portion of the groove contact member. Further, in the positioning device, it is possible to easily and accurately attach the groove contact member to a predetermined position in the pin. Further, when the pin is pulled out from the groove of the inner member and the pin insertion hole of the outer member, it is possible to reduce the likelihood of retention of the groove contact member in the groove.

According to a positioning device as a ninth aspect of the present invention for achieving the above object, in the positioning device of the eighth aspect, the engaging portion of the groove insertion portion includes at least one of a first engaging portion that is long in the pin axis direction and a second engaging portion that is long in a direction parallel to the support surface and perpendicular to the pin axis, and the engaged portion of the groove contact member includes at least one of a first engaged portion which is long in the pin axis direction and with which the first engaging portion is engaged, and a second engaged portion which is long in a direction parallel to the supported surface and perpendicular to the pin axis and with which the second engaging portion is engaged.

According to a positioning device as a tenth aspect of the present invention for achieving the above object, the positioning device of any one of the second to ninth aspects includes a liner arranged between the groove contact member and the pin in the groove, wherein in the groove contact member, a base end surface adjacent to the supported surface and directed to the base end side is formed on the base end side of the supported surface, and the liner includes a liner body that is in contact with at least one of the supported surface and the support surface, and a movement restriction portion that is bent with respect to the liner body and faces the base end surface.

In the positioning device, since the movement restriction portion of the liner faces the base end surface of the groove contact member, it is possible to restrict the relative movement of the liner to the distal end side with respect to the groove contact member. Therefore, in the positioning device, it is possible to restrict dropping of the liner to fee distal end side.

According to a positioning device as an eleventh aspect of the present invention for achieving the above object, in the positioning device of any one of the second to tenth aspects, a concave portion that communicates with the pin insertion hole, has a diameter larger than the pin insertion hole, and is recessed toward the inner circumferential side from the outer circumferential side is formed on the outer circumferential side of the outer member, and the positioning device includes a sealing member that is arranged in the concave portion and prevents fluid present on the inner circumferential side of the outer member from flowing out to the outer circumferential side.

With this positioning device, even in a rotary machine inside which a fluid flows, it is possible to prevent the fluid from flowing from the pin insertion hole of the outer member to the outside.

According to the positioning device as a twelfth aspect of the present invention for achieving the above object, in the positioning device of any one of the second to eleventh aspects, the pin insertion hole of the outer member is a cylindrical hole; the insertion portion of the pin forms a cylindrical shape such that it is insertable into the pin insertion hole; the groove insertion portion includes a side circumferential surface that is a circumferential surface obtained by extending a portion of an outer circumferential surface of the insertion portion in a cylindrical shape, and a surface that is arranged on an inner side relative to a virtual outer circumferential surface obtained by extending the outer circumferential surface of the insertion portion, the groove contact member being attached to the surface; and the groove contact member is located on the inner side relative to the virtual outer circumferential surface when the groove contact member is attached to the groove insertion portion.

In this positioning device, it is possible to easily insert the pin having the groove contact member fixed to the groove insertion portion into the cylindrical pin insertion hole.

According to a positioning device as a thirteenth aspect of the present invention for achieving the above object, the positioning device of any one of the first to ninth aspects includes a liner arranged between the groove contact member and the pin in the groove.

According to a positioning device as a fourteenth aspect of the present invention for achieving the above object, in the positioning device of any one of the first to thirteenth aspects, a concave portion that communicates with the pin insertion hole and is recessed toward the inner circumferential side from the outer circumferential side is formed on the outer circumferential side of the outer member, and the positioning device includes a lid member that closes an opening of the concave portion of the outer member.

In this positioning device, it is possible to prevent the pin from dropping from the pin insertion hole.

According to a positioning device as a fifteenth aspect of the present invention for achieving the above object, in the positioning device of any one of the first to fourteenth aspects, a plurality of position restriction concave portions are formed in the one member of the pin and the groove contact member.

In this positioning device, it is possible to further restrict relative movement between the pin and the groove contact member by inserting the claw portion of the other member into each of the plurality of position restriction concave portions formed in the one member. Further, in the positioning device, when the groove contact member is attached to the pin, one of the plurality of position restriction concave portions can be left as a spare position restriction concave portion without the claw portion inserted therein. Accordingly, when the groove contact member is removed from the pin and the groove contact member is attached to the pin again, the spare position restriction concave portion can be used.

According to a positioning device as a sixteenth aspect of the present invention for achieving the above object, in the positioning device of any one of the first to fifteenth aspects, a deformation assistance concave portion is formed on the side opposite to the position restriction concave portion of the one member with reference to the claw portion in the other member.

In this positioning device, when a portion of the other member is plastically deformed with a tool such as a punch, it is possible to easily apply the tool such as a punch to a position adjacent to the portion of the other member and easily plastically deform the portion of the other member.

A rotary machine as a seventeenth aspect of the present invention for achieving the above object includes the positioning device of any one of the first to sixteenth aspects; the outer member; the inner member; and a rotor that is arranged on the inner circumferential side of the inner member and rotates around the axis.

According to a rotary machine as an eighteenth aspect of the present invention for achieving the above object, in the rotary machine of the seventeenth aspect, the rotor is a steam turbine rotor. That is, the rotary machine may be a steam turbine.

A positioning method as a nineteenth aspect of the present invention for achieving the above object is a positioning method of positioning an inner member arranged on an inner circumferential side of an outer member and extending in a circumferential direction around an axis with respect to the outer member extending in the circumferential direction around the axis, the positioning method including: a preparation step of preparing a positioning device including a pin that enters a pin insertion hole extending from the inner circumferential side to an outer circumferential side of the outer member and a groove recessed from an outer circumferential side to an inner circumferential side of the inner member, and a groove contact member coming into contact with a groove side surface of the groove; an adjusted pin assembly step of assembling an adjusted pin obtained by assembling the groove contact member to the pin; and a positioning device attachment step of inserting the adjusted pin into the pin insertion hole of the outer member and the groove of the inner member, wherein in one member of the pin and the groove contact member to be prepared in the preparation step, a position restriction concave portion that is recessed in a direction away from the other member is formed in a portion facing the other member, and the adjusted pin assembly step includes a member assembly step of placing the groove contact member so as to face the pin and plastically deforming a portion of the other member as a claw portion so as to enter the position restriction concave portion and come into contact with the position restriction concave portion.

In this positioning method, in the member assembly step, the portion of the other member is plastically deformed so that this portion enters, as a claw portion, the position restriction concave portion of the one member and comes into contact with the position restriction concave portion. As a result, relative movement between the pin and the groove contact member is restricted. Therefore, in the positioning method, a member such as a bolt for fixing a member in contact with the groove side surface of the groove of the inner member to the pin, as a component of the positioning device, is unnecessary, and it is possible to reduce the number of components to be prepared in the preparation step.

According to a positioning method as a twentieth aspect of the present invention for achieving the above object, in the positioning method of the nineteenth aspect, the adjusted pin assembly step includes a concave portion formation step of forming the position, restriction concave portion in the one member, and in the member assembly step, the groove contact member is placed so as to face the pin, and a portion of the other member is plastically deformed as a claw portion so as to enter one of the position restriction concave portion already formed before the adjusted pin assembly step and the position restriction concave portion formed in the concave portion formation step.

A positioning method as a twenty-first aspect of the present invention for achieving the above object is a positioning method of positioning an inner member arranged on an inner circumferential side of an outer member and extending in a circumferential direction around an axis with respect to the outer member extending in the circumferential direction around the axis, the positioning method including: a preparation step of preparing a positioning device including a pin that enters a pin insertion hole extending from the inner circumferential side to an outer circumferential side of the outer member and a groove recessed from an outer circumferential side to an inner circumferential side of the inner member, and a groove contact member coming into contact with a groove side surface of the groove; an adjusted pin assembly step of assembling an adjusted pin obtained by assembling the groove contact member to the pin; and a positioning device attachment step of inserting the adjusted pin into the pin insertion hole of the outer member and the groove of the inner member, wherein the adjusted pin assembly step includes: a concave portion formation step of forming, in one member of the pin and the groove contact member, a position restriction concave portion which is recessed in a direction away from the other member in a portion facing the other member; and a member assembly step of placing the groove contact member so as to face the pin, and plastically deforming a portion of the other member as a claw portion so as to enter the position restriction concave portion and come in contact with the position restriction concave portion.

In this positioning method, in the member assembly step, the portion of the other member is plastically deformed so that this portion enters, as a claw portion, the position restriction concave portion of the one member and comes into contact with the position restriction concave portion. As a result, relative movement between the pin and the groove contact member is restricted. Therefore, in the positioning method, a member such as a bolt for fixing a member in contact with the groove side surface of the groove of the inner member to the pin, as a component of the positioning device, is unnecessary, and it is possible to reduce the number of components to be prepared in the preparation step.

According to a positioning method as a twenty-second aspect of the present invention for achieving the above object, in the positioning method of any one of the nineteenth to twenty-first aspects, a plurality of liners are prepared in the preparation step; the adjusted pin assembly step includes a liner selection step of selecting any one of the plurality of liners; and in the member assembly step, the liner selected in the liner selection step is arranged between the pin and the groove contact member, the groove contact member is placed so as to face the pin with the timer therebetween, and a portion of the groove contact member is plastically deformed so as to enter, as a claw portion, the position restriction concave portion.

According to a positioning method as a twenty-third aspect of the present invention for achieving the above object, in the positioning method of any one of the nineteenth to twenty-first aspects, the adjusted pin assembly step includes a thickness adjustment step of adjusting a thickness of the groove contact member, and the member assembly step is executed after the thickness adjustment step.

Advantageous Effects of Invention

According to an aspect of the present invention, it is possible to reduce the number of components of the positioning device.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of a positioning device and a rotary machine including the positioning device, and modification examples of the positioning device according to the present invention will be described in detail with reference to the drawings.

Embodiment

First, an embodiment of a positioning device and a rotary machine including the positioning device according to the present invention will be described with reference toFIGS. 1 to 19.

The rotary machine of the embodiment is a steam turbine. The steam turbine includes a rotor (a steam turbine rotor)1, a blade ring5, a casing10, and a positioning device20, as illustrated inFIG. 1. The rotor1rotates about a rotation axis Ar. The blade ring5is arranged on the outer circumferential side of the rotor1and forms an annular shape around the rotation axis Ar. The casing10is arranged on the outer circumferential side of the blade ring5and forms an annular shape around the rotation axis Ar. The positioning device20determines a relative position of the blade ring5with respect to the casing10. Hereinafter, a direction in which the rotation axis Ar extends is set as an axial direction Da, a radial direction with reference to the rotation axis Ar is simply set as a radial direction Dr, and a circumferential direction with respect to the rotation axis Ar is simply set as a circumferential direction Dc. Further, a horizontal direction perpendicular to the rotation axis Ar is set as a horizontal direction Dh, and a vertical direction perpendicular to the rotation axis Ar is set as a vertical direction Dv.

The rotor1includes a rotor shaft2that extends in the axial direction Da around the rotation axis Ar, and a plurality of blades3arranged in the circumferential direction Dc and fixed to the rotor shaft2. A plurality of vanes9arranged in the circumferential direction Dc are provided in the annular blade ring5at positions upstream of the blades3of the rotor1on the inner circumferential side of the blade ring5. In the steam turbine, a cylindrical space between the outer circumferential side of the rotor shaft2and the inner circumferential side of the annular blade ring5, in other words, a space in which the blades3and the vanes9are arranged is a steam channel. The annular blade ring5includes an upper half blade ring6xon the upper side with reference to the rotation axis Ar, and a lower half blade ring6yon the lower side. The upper half blade ring6xand the lower half blade ring6yeach form a semicircular arc shape with reference to the rotation axis Ar and are connected to each other by bolts or the like in the end portions in the circumferential direction Dc. Further, the annular casing10includes an upper half casing11xon the upper side with reference to the rotation axis Ar, and a lower half casing11yon the lower side. Further, the upper half casing11xand the lower half casing11yeach form a semicircular arc shape with reference to the rotation axis Ar, and are connected to each other by bolts or the like in the end portions in the circumferential direction Dc.

Grooves18recessed from the inner circumferential side to the outer circumferential side are formed in the end portions in the circumferential direction Dc of the lower half casing11y. Further, projections19that project toward the outer circumferential side are provided in the end portions in the circumferential direction Dc of the lower half blade ring6y, and the projections19are engaged with the grooves18. The lower half blade ring6yis constrained so that the lower half blade ring6yis not relatively movable in the vertical direction Dv and the axial direction Da with respect to the lower half casing11ydue to the engagement between the projections19and the grooves18. Further, a projection (not illustrated) projecting toward the inner circumferential side over the entire circumference in the circumferential direction Dc is formed on the inner circumferential surface of the lower half casing11y. Further, a groove portion (not illustrated) recessed toward the inner circumferential side over the entire circumference in the circumferential direction Dc is formed in the outer circumferential surface of the lower half blade ring6y. The projection is engaged over the entire circumference in the groove. Thus, the lower half blade ring6yis constrained so as not to be relatively movable in the axial direction Da with respect to the lower half casing11y. Further, an engagement portion in the circumferential direction is similarly formed in the upper half casing11xand the upper half blade ring6x. The lower half blade ring6yis movable in the horizontal direction Dh with respect to the lower half casing11yat a time at which the positioning device20is not set. Further, the upper half blade ring6xis also movable in the horizontal direction Dh with respect to the upper half casing11xat a time at which the positioning device20is not set.

In the embodiment, each of the upper half blade ring6xand the lower half blade ring6yforms an inner member, and each of the upper half casing11xand the lower half casing11yforms an outer member. Hereinafter, the upper half blade ring6xand the lower half blade ring6ymay be simply referred to as a half blade ring6, and the upper half casing11xand the lower half casing11ymay be simply referred to as a half casing11.

The positioning device20includes a lower positioning device20that determines a relative position of the lower half blade ring6ywith respect to the lower half casing11y, and an upper positioning device20that determines a relative position of the upper half blade ring6xwith respect to the upper half casing11x. The upper positioning device20and the lower positioning device20have the same structure. Therefore, hereinafter, the lower positioning device20will be mainly described.

As illustrated inFIGS. 2 to 4, a cylindrical pin insertion hole12penetrating from the inner circumferential side to the outer circumferential side, and a flange accommodation concave portion13recessed from the outer circumferential side to the inner circumferential side and communicating with the pin insertion hole12are formed in the half casing11. An inner diameter of the flange accommodation concave portion13is larger than an inner diameter of the pin insertion hole12. A female screw14is formed in an inner circumferential surface of the flange accommodation concave portion13. The pin insertion hole12penetrates from a bottom surface of the flange accommodation concave portion13to the inner circumferential side of the half casing11.

A pin groove7recessed from the outer circumferential side to the inner circumferential side is formed in the half blade ring6at a position facing the pin insertion hole12of the half casing11in the radial direction Dr. The pin groove7is defined by a groove bottom surface8cformed in the half blade ring6, and a pair of groove side surfaces8formed in the half blade ring6and facing each other in the horizontal direction Dh, as illustrated inFIGS. 2 and 4.

The pin insertion hole12and the flange accommodation concave portion13of the half casing11, and the pin groove7of the half blade ring6are formed on a vertical line Lv intersecting the rotation axis Ar and extending in the vertical direction, as illustrated inFIG. 1.

The positioning device20includes a pin21, a groove contact member41, a liner61, a sealing member75, a pin pressing screw81(lid member), and a loosening stop tool85, as illustrated inFIGS. 2 to 4. The pin21enters the pin insertion hole12of the half casing11and the pin groove7of the half blade ring6. The groove contact member41is in contact with the groove side surface8of the pin groove7. The liner61is arranged between the groove contact member41and the pin21in the pin groove7. The sealing member75seals between the pin21and the half casing11. The pin pressing screw81is in contact with a head of the pin21. The loosening stop tool85restricts loosening of the pin pressing screw81. The groove contact member41includes a first groove contact member41athat is in contact with a first groove side surface8aof the pair of groove side surfaces8of the pin groove7, and a second groove contact member41bthat is in contact with a second groove side surface8b.

The pin21includes a cylindrical insertion portion22that is inserted into the pin insertion hole12of the half casing11, a groove insertion portion23formed at one of the two ends of the insertion portion22, and a head flange31formed at the other end of the insertion portion22, as illustrated inFIGS. 2, 4, and 5. Here, a center axis of the cylindrical insertion portion22is set as a pin axis Ap, and a direction in which the pin axis Ap extends is set as a pin axis direction Dp. Further, a side on which the groove insertion portion23is formed with respect to the insertion portion22in the pin axis direction Dp is taken as a distal end side, and a side on which the head flange31is formed with respect to the insertion portion22in the pin axis direction Dp is taken as a base end side.

A side circumferential surface23c, a pair of support surfaces24, and a distal end surface27are formed in the groove insertion portion23. The side circumferential surface23cis a surface obtained by partially extending the outer circumferential surface of the cylindrical insertion portion22. The pair of support surfaces24are located on the inner side relative to a virtual outer circumferential surface obtained by extending the outer circumferential surface of the insertion portion22. The distal end surface27is formed on the distal end side of the groove insertion portion23and is directed to the distal end side. The virtual outer circumferential surface is a virtual surface obtained by extending the outer circumferential surface of the insertion portion22in the pin axis direction Dp. The pair of support surfaces24are all located on the inner side relative to the virtual outer circumferential surface, and are directed in mutually opposite directions in a direction perpendicular to the pin axis Ap. A groove insertion portion thickness Wd that is an interval between the pair of support surfaces24is smaller than a diameter of the cylindrical insertion portion22. In each of the pair of support surfaces24, a pair of first engaging concave portions (engaging portions; first engaging portions)25and a second engaging concave portion (an engaging portion; a second engaging portion)26that are recessed toward the other support surface24are formed. The first engaging concave portions25are formed such that they are long in the pin axis direction Dp. The first engaging concave portions25are formed in the support surface24with an interval therebetween in a direction perpendicular to the pin axis direction Dp along the support surface24. The first engaging concave portion25includes a base end side engaging portion25aof which the amount of recess with respect to the support surface24is a predetermined amount of recess, and a distal end side engaging portion25barranged on the distal end side relative to the base end side engaging portion25a. An amount of recess of the distal end side engaging portion25bgradually increases toward the distal end side from the predetermined amount of recess of the base end side engaging portion25a. The second engaging concave portion26is formed such that it is long in a direction perpendicular to the pin axis direction Dp and along the support surface24. The second engaging concave portion26is formed at a position on the base end side of the support surface24. The support surface24includes a main support surface24abetween the pair of first engaging concave portions25, and an outer surface24bopposite to the main support surface24awith reference to the first engaging concave portion25.

A deformation assistance concave portion35is formed in a region including a corner between one of the pair of support surfaces24and the distal end surface27and a region including a corner between the other of the pair of support surfaces24and the distal end surface27. The deformation assistance concave portion35includes a first assistance concave portion35aand a second assistance concave portion35b. The first, assistance concave portion35ais formed in a region including the corner between the support surface24and the distal end surface27near one of the pair of first engaging concave portions25. The second assistance concave portion35bis formed in a region including the corner between the support surface24and the distal end surface27near the other of the pair of first engaging concave portions25.

Facing surfaces that face the surface of the groove contact member41among the surfaces of the groove insertion portion23include the main support surface24a, a surface defining the first engaging concave portion25, and a surface defining the second engaging concave portion26. On the other hand, exposed surfaces that do not face the surface of the groove contact member41among the surfaces of the groove insertion portion23are the distal end surface27, the side circumferential surface23c, and the outer surface24b.

A diameter of the cylindrical insertion portion22is substantially the same as an inner diameter of the pin insertion hole12of the half casing11. A tapered reception surface29gradually extending toward the distal end as the tapered reception surface29extends away from the support surface24is formed on the distal end side in the insertion portion22.

The head flange31forms a disc shape around the pin axis Ap. A diameter of the head flange31is larger than the diameter of the cylindrical insertion portion22and the inner diameter of the pin insertion hole12of the half casing11and smaller than the inner diameter of the flange accommodation concave portion13of the half casing11. An annular seal groove32is formed around the pin axis Ap in a surface on which the insertion portion22is provided in the head flange31. The sealing member75described above forms an annular shape and a portion of the sealing member75enters the seal groove32.

The pin pressing screw81(lid member) includes a screw portion82in which a male screw which can be screwed into the female screw14formed in the flange accommodation concave portion13of the half casing11is formed, and a screw head portion83formed at an end of the screw portion82, as illustrated inFIG. 2. The screw head portion83forms a hexagonal columnar shape with which a tool such as a wrench can be engaged.

The loosening stop tool85includes a loosening stop screw86and a wire88. The loosening stop screw86can be screwed into a loosening stop screw hole15that is adjacent to the pin insertion hole12of the half casing11. The wire88connects the screw head portion83of the pin pressing screw81to a screw head portion87of the loosening stop screw86. The wire88may be directly connected to each of the screw head portion83of the pin pressing screw81and the screw head portion87of the loosening stop screw86, but may be connected to the screw head portions83and87of the screws81and86via the pin21fitted in each of the screw head portions83and87.

The first groove contact member41aand the second groove contact member41bhave the same shape. Therefore, hereinafter, only the first groove contact member41awill be described. In the first groove contact member41a, a groove contact surface42, a supported surface43, a distal end surface47, a pair of side surfaces48, a base end surface51, a tapered contact surface52, a first tapered surface44a, and a pair of second tapered surfaces44bare formed as illustrated inFIGS. 4 and 6 to 10. The groove contact surface42is in contact with the first groove side surface8aof the pin groove7. The supported surface43is directed opposite to a direction in which the groove contact surface42is directed. The distal end surface47is formed on the distal end side of the first groove contact member41aand is directed to the distal end side. The pair of side surfaces48are directed to opposite sides. The base end surface51is formed on the base end side of the first groove contact member41aand is directed to the base end side. The tapered contact surface52is in surface contact with the tapered reception surface29of the pin21. The first tapered surface44ais continuous with the groove contact surface42. The pair of second tapered surfaces44bare continuous with the groove contact surface42.

The pair of side surfaces48are provided on opposite sides of the first groove contact member41ain a groove contact member width direction Daw that is a direction perpendicular to the pin axis direction Dp and along the groove contact surface42in a state in which the first groove contact member41ais fixed to the groove insertion portion23of the pin21, as illustrated inFIGS. 6, 9, and 10. The distal end surface47is a surface adjacent to the first tapered surface44a, the second tapered surface44b, the pair of side surfaces48, and the supported surface43. The base end surface51is a tapered surface that is continuous with a base end side edge of the supported surface43and extends toward the base end as the tapered surface extends away from the supported surface43to the groove contact surface42as illustrated inFIGS. 6 and 8. The tapered contact surface52is a tapered surface that is continuous with the base end side edge of the groove contact surface42and gradually extends toward the base end as the tapered surface extends away from the groove contact surface42to the supported surface43. In other words, the tapered contact surface52is a tapered surface gradually extending toward the distal end side as the tapered surface extends away from the supported surface43to the groove contact surface42. The first tapered surface44ais inclined with respect to the groove contact surface42such that it gradually approaches the supported surface43toward the distal end from the groove contact surface42. The pair of second tapered surfaces44bare provided on sides opposite to each other in the groove contact member width direction Daw in the first groove contact, member41a, as illustrated inFIGS. 6, 9, and 10. The pair of second tapered surfaces44bare inclined with respect to the groove contact surface42such that they gradually extend away from the second tapered surface44bon the other side as they approach the supported surface43from the groove contact surface42.

Two first engaged convex portions (engaged portions; first engaged portions)45and a second engaged convex portion (an engaged portion; a second engaged portion)46are formed in the supported surface43, as illustrated inFIGS. 4, 6, and 8 to 10. The first engaged convex portion45is fitted into the first engaging concave portion25of the pin21. The second engaged convex portion46is fitted into the second engaging concave portion26of the pin21. The two first engaged convex portions45are formed as a pair with an interval therebetween, similarly to the pair of first engaging concave portions25of the pin21. The first engaged convex portion45includes a base end side engaged portion45aof which the amount of projection with respect to the supported surface43is a predetermined amount of projection, and a distal end side engaged portion45barranged on the distal end side relative to the base end side engaged portion45a. The amount of projection of the distal end side engaged portion45bgradually increases toward the distal end side from the predetermined amount of projection of the base end side engaged portion45a. The base end side engaged portion45aof the first engaged convex portion45enters the base end side engaging portion25aof the first engaging concave portion25in the pin21. Further, a distal end side engaged portion45bof the first engaged convex portion45enters the distal end side engaging portion25bof the first engaging concave portion25in the pin21. A pair of convex side surfaces directed to opposite sides in the groove contact member width direction Daw are formed in the first engaged convex portion45. A portion of the side surface48of the first groove contact member41aforms one convex side surface of the pair of convex side surfaces. The other convex side surface of the pair of convex side surfaces forms a convex inner surface48a. A width of the second engaged convex portion46in the pin axis direction Dp is slightly narrower than the width of the second engaging concave portion26of the pin21in the pin axis direction Dp. Therefore, even when the second engaged convex portion46of the groove contact member41is fitted into the second engaging concave portion26of the pin21, the groove contact member41is slightly movable relative to the pin21in the pin axis direction Dp.

The second groove contact member41bhas the same shape as the first groove contact member41a, as described above. However, the groove contact surface42of the second groove contact member41bis in contact with the second groove side surface8bof the pin groove7.

A first position restriction concave portion55ais formed in a region including a corner between the convex inner surface48aand the distal end surface47of one of the pair of first engaged convex portions45. Further, a second position restriction concave portion55bis formed in a region including a corner between the convex inner surface48aand the distal end surface47of the other first engaged convex portion45. Hereinafter, the first position restriction concave portion55aand the second position restriction concave portion55bare collectively referred to as the position restriction concave portion55. The position restriction concave portion55is formed by moving a cylindrical tool in a direction inclined with respect to both of the distal end surface47and the convex inner surface48a. Therefore, a concave surface defining the position restriction concave portion55forms a portion of the outer circumferential surface of a virtual cylinder Cv centered on a virtual axis parallel to the supported surface43and inclined with respect to both of the distal end surface47and the convex inner surface48a, as illustrated inFIG. 7. The first assistance concave portion35aand the second assistance concave portion35bof the pin21are formed by moving a cylindrical tool in a direction inclined with respect to both the distal end surface27and the support surface24of the pin21. Therefore, a concave surface defining the first assistance concave portion35aand the second assistance concave portion35bforms a portion of the outer circumferential surface of a virtual cylinder centered on a virtual axis inclined with respect to both the distal end surface27and the support surface24of the pin21.

Thus, in the embodiment, since the position restriction concave portion55and the deformation assistance concave portion35are formed by linearly moving a cylindrical tool, it is possible to easily form the position restriction concave portion55and the deformation assistance concave portion35.

In the embodiment, the position restriction concave portion55is formed in a region including a corner between the convex inner surface48aof the first engaged convex portion45and the distal end surface47, as described above. Therefore, in the embodiment, in order to ensure a region for forming the position restriction concave portion55and ensure strength of the vicinity of the position restriction concave portion55when a portion of the pin21is plastically deformed so as to enter, as a claw portion37, the position restriction concave portion55as will be described below, the amount of projection of the distal end side engaged portion45bof the first engaged convex portion45is made larger than the amount of projection of the base end side engaged portion45a.

Facing surfaces that face the surface of the pin21among the surfaces of the groove contact member41include the supported surface43, a surface forming the first engaged convex portion45, a surface defining the second engaged convex portion46, the base end face51, and the tapered contact surface52. On the other hand, exposed surfaces that do not face the surface of the pin21among the surfaces of the groove contact member41include the distal end surface47, the pair of side surfaces48, the first tapered surface44a, and the second tapered surface44b. However, in the pair of side surfaces48, a portion forming the convex side surface of the first engaged convex portion45is a facing surface, and is not an exposed surface.

The liner61forms a rectangular plate shape or sheet shape, as illustrated inFIGS. 4, 9, and 13. The liner61includes a liner body62in contact with the support surface24of the pin21and/or the supported surface43of the groove contact member41, and a movement restriction portion65connected to the base end side edge of the liner body62. A convex insertion portion63into which the second engaged convex portion46of the groove contact member41is inserted is formed in the liner body62. The movement restriction portion65is bent with respect to the liner body62. This movement restriction portion65faces the base end surface51of the groove contact member41.

A length L1of a pair of sides facing each other in the pin axis direction Dp of the liner61(seeFIG. 9) is slightly smaller than an interval between the pair of first engaging concave portions25of the pin21and an interval between the pair of first engaged convex portions45of the groove contact member41. Therefore, when this liner61is arranged between the groove insertion portion23of the pin21and the groove contact member41, this liner61can be arranged at a position at which the engaging portions25and26of the groove insertion portion23and the engaged, portions45and46of the groove contact member41are avoided. Therefore, in the embodiment, the liner61does not easily stick, to the pin21, and the liner61can be easily removed from the pin21when the positioning device20is removed.

As illustrated inFIGS. 18 and 19, a groove width Wc that is an interval between the first groove side surface8aand the second groove side surface8bof the pin groove7is larger than a sum of a groove contact member thickness Wp that is an interval between the groove contact surface42and the supported surface43of the first groove contact member41a, a groove contact member thickness Wp that is an interval between the groove contact surface42and the supported surface43of the second groove contact member41b, and a groove insertion portion thickness Wd of the groove insertion portion23. The liner61includes a plurality of types of liner61having different thicknesses. For example, there may be a plurality of each of liners61having thicknesses of 0.05 mm, 0.1 mm, 0.2 mm, and 0.3 mm.

Next, a method of positioning the half blade ring6using the positioning device20described above will be described with reference to the flowchart illustrated inFIG. 14. This positioning is performed when a new steam turbine is installed or when replacement work for the blade ring5that is a component of the steam turbine is performed. Further, hereinafter, a method of positioning the tower half blade ring6ywith respect to the lower half casing11yusing the positioning device20will be described.

First, the positioning device20described above is prepared (S0: preparation step). That is, the pin21, the liner61, the groove contact member41, the sealing member75, the pin pressing screw81, and the loosening stop tool85constituting the positioning device20are prepared. In this case, a plurality of liners61having different thicknesses are prepared.

Prior to start of substantial positioning work, the lower half blade ring6yis removed from the lower half casing11y. Further, the rotor1is not supported by a bearing portion (not illustrated) provided in the lower half casing11y.

At the start of the substantial positioning work, first, the lower half blade ring fey is hung by a crane or the like and accommodated in the lower half casing11y. In this process, as illustrated inFIG. 15, provisional positioning of the lower half blade ring6ywith respect to the lower half casing11yin the horizontal direction Dh is performed using a provisional positioning device20ahaving a provisional pin21a(S1: provisional positioning step.

The provisional pin21aof the provisional positioning device20aincludes the pin21in the positioning device20of the embodiment, a pair of groove contact members41, and a pair of prescribed liners61ahaving a prescribed thickness, as illustrated inFIG. 18. In this case, for the prescribed thickness of the pair of prescribed liners61a, a sum of a thickness Wo of the pair of prescribed liners61a, the groove contact member thickness Wp of the pair of groove contact members41, and the groove insertion portion thickness Wd of the groove insertion portion23of the pin21is substantially the same as the groove width Wc of the pin groove7. The provisional pin21aincludes a cylindrical insertion portion22that is inserted into the pin insertion hole12of the half casing11, and a groove insertion portion that is formed at an end of the insertion portion22, and a thickness of the groove insertion portion may be substantially the same as the groove width Wc of the pin groove7. That is, an arbitrary provisional pin21amay be used herein as long as a thickness of a portion thereof entering the pin groove7is substantially the same as a groove width Wc of the pin groove7. It is preferable for this provisional positioning device20ato be also prepared in the preparation step (S0).

Then, the rotor1is arranged in the lower half casing11yusing a crane or the like, as illustrated inFIG. 16(S2: rotor arrangement step). In this process, the rotor1is supported by the bearing portion (not illustrated) provided in the lower half casing11y, and a relative position in the horizontal direction Dh of the rotor1with respect to the lower half casing11yis determined.

Then, a deviation amount in the horizontal direction Dh of the lower half blade ring6ywith respect to the rotor1or the lower half casing11yis measured (S3: deviation measurement step). Since a relative position in the horizontal direction Dh of the rotor1with respect to the lower half casing11yhas already been determined, a deviation amount in the horizontal direction Dh of the lower half blade ring6ywith respect to the rotor1is the same as a deviation amount in the horizontal direction Dh of the half blade ring6ywith respect to the lower half casing11y.

Then, the liner61having the thickness according to the deviation amount measured in the deviation measurement step (S3) is selected, and the liner61is attached to the pin21(S4: adjusted pin assembly step). In the adjusted pin assembly step (S4), any one liner61is first selected from the plurality of liners61(S1: liner selection step). In the liner selection step (S41), for example, the deviation amount in the horizontal direction Dh of the lower half blade ring6yprovisionally positioned by the provisional pin21awith respect to the lower half casing11yis assumed to be a, as illustrated inFIG. 18. In this case, thicknesses of the pair of prescribed liners61awhich are components of the provisional pin21aare both assumed to be Wo. In order to correct this deviation amount a, a thickness W1of one of the pair of liners61may be (Wo−a), and a thickness W2of the other liner61may be (Wo+a), as illustrated inFIG. 19. Therefore, the liner61having the thickness W1of (Wo−a) and the liner61having the thickness W2of (Wo+a) are selected from among the plurality of liners61prepared in the preparation step (S0). The liner61having the thickness W1of (Wo−a) and the liner61having the thickness W2of (Wo+a) are not required to be a single liner61and may include a plurality of liners61.

In the adjusted pin assembly step (S4), after the liner selection step (S41), the selected liner is attached to the groove contact member41, and then, the groove contact member41is attached to the pin21(S42: member assembly step). In this member assembly step (S42), first, the liner body62of the selected liner61is placed so as to face the supported surface43of the groove contact member41, and the movement restriction portion65of the liner61is placed so as to face the base end surface51of the groove contact member41, as illustrated inFIGS. 4 and 13. Subsequently, the second engaged convex portion46of the groove contact member41is inserted into the convex insertion portion63of the liner61. Then, the first engaged convex portions45of the groove contact member41are inserted into the first engaging concave portions25of the pin21, and the second engaged convex portion46of the groove contact member41is inserted into the second engaging concave portion26of the pin21. Then, by slightly moving the groove contact member41to the base end side relative to the pin21, the tapered contact surface52of the groove contact member41is brought into surface contact with the tapered reception surface29of the pin21. Then, as illustrated inFIGS. 11 and 12, a distal end of a tool T such as a punch is inserted into the deformation assistance concave portion35of the pin21, and the tool T is tapped with a hammer or the like to plastically deform a portion36between the deformation assistance concave portion35and the adjacent position restriction concave portion55of the groove contact member41in the portion of the pin21toward this position restriction concave portion55. This portion36of the pin21enters, as the claw portion37, the position restriction concave portion55due to the plastic deformation and comes into close contact over a wide range of the concave surface defining the position restriction concave portion55. That is, the position restriction concave portion55of the groove contact member41is caulked by the portion36of the pin21.

The adjusted pin assembly step (S4) is then completed, and the selected liner and the groove contact member41are attached to the pin21. Thus, the pin21to which the selected liner61and the groove contact member41are attached forms an adjusted pin21b.

In a stage in which the adjusted pin assembly step (S4) ends, the tapered contact surface52of the groove contact member41is in surface contact with the tapered reception surface29of the pin21. Therefore, relative movement of the groove contact member41to the base end side with respect to the pin21is restricted. Further, since the claw portion37of the pin21has entered the position restriction concave portion55of the groove contact member41, the relative movement of the groove contact member41to the distal end side with respect to the pin21is restricted. In this stage, the tapered contact surface52on the base end portion side of the groove contact member41is in surface contact with the tapered reception surface29of the pin21, and the claw portion37of the pin21has entered the position restriction concave portion55on the distal end portion side of the groove contact member41. Therefore, relative movement of the groove contact member41to a side away from the support surface24of the pin21with respect to the pin21is restricted. Further, in this stage, since the first engaged convex portions45of the groove contact member41have entered the first engaging concave portions25of the pin21, the relative movement of the groove contact member41in the groove contact member width direction Daw with respect to the pin21is restricted. Therefore, in this stage, the relative movement of the groove contact member41in all directions is restricted with respect to the pin21. In other words, in this stage, the groove contact member41is fixed to the pin21.

As described above, since the tapered contact surface52of the groove contact member41is in surface contact with the tapered reception surface29of the pin21, relative movement of the groove contact member41to the base end side with respect to the pin21and relative movement thereof to the side away from the support surface24of the pin21are restricted. Further, since the tapered contact surfaces52of the groove contact member41and the tapered reception surface29of the pin21are both tapered surfaces, it is possible to cope with a change in the thickness of the liner61while restricting relative movement of the groove contact member41with respect to the pin21.

Further, in a stage in which the adjusted pin assembly step (S4) is completed, the liner body62is sandwiched between the supported surface43of the groove contact member41and the support surface24of the pin21. Therefore, relative movement of the liner61to the side away from the supported surface43of the groove contact member41and the relative movement thereof to the side away from the support surface24of the pin21are restricted. In this stage, the movement restriction portion65of the liner61is in contact with the base end surface51of the groove contact member41. Thus, the relative movement of the liner61to the distal end side with respect to the groove contact member41and the pin21is restricted. Further, in this stage, the liner61is arranged between the pair of first engaged convex portions45of the groove contact member41. Thus, relative movement of the liner61in the groove contact member width direction Daw with respect to the groove contact member41and the pin21is restricted. Therefore, in this stage, relative movement of the liner61in all directions with respect to the groove contact member41and the pin21is restricted. In other words, in this stage, the liner is fixed to the groove contact member41and the pin21.

The groove contact member41is located on the inner side relative to the above-described virtual outer circumferential surface obtained by extending the outer circumferential surface of the cylindrical insertion portion22, in a state in which the liner61and the groove contact member41are fixed to the groove insertion portion23of the pin21.

Then, the lower half blade ring6ythat has been provisionally positioned is provisionally held by a crane or the like so that the lower half blade ring6yis movable in the horizontal direction Dh (S5: provisional holding step).

Then, the provisional positioning device20athat provisionally positions the lower half blade ring6yis removed from the lower half blade ring6yand the lower half casing11y, as illustrated inFIG. 17(S6: provisional positioning release step). The above-described provisional holding step (S5) may be performed after execution of the provisional positioning release step (S6).

Subsequently, the adjusted positioning device20bin place of the provisional positioning device20ais attached to the lower half blade ring6yand the lower half casing11y(S7: positioning device attachment step), as illustrated inFIG. 17. The adjusted positioning, device20bis a positioning device20including the above-described adjusted pin21b. In the attachment of the adjusted positioning device20b, first, the adjusted pin21bis inserted into the pin insertion holes12of the lower half casing11yand the pin groove7of the lower half blade ring6y. In this case, the sealing member75is inserted into the seal groove32of the pin21in advance.

As described above, the side circumferential, surface23cobtained by partially extending the outer circumferential surface of the cylindrical insertion portion22is formed in the groove insertion portion23of the pin21. Further, the groove contact member41is located on the inner side relative to the above-described virtual outer circumferential surface obtained by extending the outer circumferential surface of the cylindrical insertion portion22, in a state in which the liner61and the groove contact member41are fixed to the groove insertion portion23of the pin21. Further, the first tapered surface44ais formed on the distal end side in the groove contact member41. Therefore, the adjusted pin21bcan be easily inserted into the pin insertion hole12of the lower half casing11yand the pin groove7of the lower half blade ring6y.

Then, as illustrated inFIGS. 2 and 3, the pin pressing screw81is screwed into the flange accommodation concave portion13that communicates with the pin insertion hole12of the lower half casing11y. When the pin pressing screw81is screwed in, the distal end of the pin pressing screw81comes in contact with the head flange31of the adjusted pin21b. That is, an opening of the flange accommodation concave portion13of the lower half casing11yis blocked by the pin pressing screw81(lid member), and the adjusted pin21bis prevented from coming out of the pin insertion hole12by the pin pressing screw81. Then, the loosening stop tool85is attached to the pin pressing screw81. In the attachment of the loosening stop tool85, the loosening stop screw86is screwed into loosening stop hole15of the half casing11. The screw head portion87of the loosening stop screw86and the screw head portion83of the pin pressing screw81are connected by the wire88to restrict the rotation in a loosening direction of the pin pressing screw81.

The provisional holding of the lower half casing11yusing a crane or the like is released (S8: provisional holding release step).

Thus, the positioning of the lower half blade ring6yin the horizontal direction Dh with respect to the lower half casing11yis completed.

The adjusted pin assembly step (S6) is executed after the deviation measurement step (S3) and before the provisional holding step for the lower half blade ring6y(S5). However, the adjusted pin assembly step (S6) may be executed at any time as long as the process is after the deviation measurement step (S3) and before the positioning device attachment step (S7). The above describes that immediately after the adjusted pin21band the pin pressing screw81are attached, the attachment of the loosening stop tool85is executed. However, the attachment of the loosening stop tool85may be performed after basic assembly of the steam turbine is completed.

Although the method of positioning the lower half blade ring by6ywith respect to the lower half casing11yhas been described above, positioning of the upper half blade ring6xwith respect to the upper half casing11xis also basically the same as the procedure of the above positioning method. However, in this case, the rotor arrangement step (S2) described above is not executed. Specifically, first, the upper half casing11xis provisionally fixed so that the inner surface is directed upward, and the upper half blade ring6xis provisionally positioned with respect to the upper half casing11xusing the provisional positioning device29a(St: provisional positioning step). Then, the deviation amount in the horizontal direction Dh of the upper half blade ring6xwith respect to the upper half casing11xis measured (S3: deviation measurement step). Subsequently, the adjusted pin assembly step (S4) and the like are executed, similarly to the method of positioning the lower half blade ring6ywith respect to the lower half casing11y. Thereafter the provisional positioning device21kis removed and the upper half blade ring6xis removed from the upper half casing11x. The upper half blade ring6x, the upper half casing11x, and the adjusted positioning device20bare assembled with the lower half blade ring6yand the lower half casing11y.

As described above, in the embodiment, the portion36of the pin21is plastically deformed so as to enter the position restriction concave portion55of the groove contact member41as the claw portion37and come into contact with this position restriction concave portion55. Thus, the relative movement of the groove contact member41with respect to the pin21is restricted. Therefore, in the positioning device20of the embodiment, bolts or the like for fixing the member in contact with the groove side surface8of the pin groove7to the pin21are unnecessary, and the number of components can be reduced.

The support surface24of the pin21receives a force in the horizontal direction Dh from the half blade ring6via the supported surface43of the groove contact member41. Therefore, it is preferable for an area of the support surface24and an area of the supported surface43to be large in order to withstand a force applied from the half blade ring6. In the embodiment, it is not necessary to form a bolt hole into which a bolt is inserted in the support surface24of the pin21and the supported surface43of the groove contact member41. Therefore, in the positioning device20of the embodiment, it is possible to increase the areas of the surfaces24and43without changing a width or the like of the support surface24of the pin21and the supported surface43of the groove contact member41, in contrast with a case in which the bolt hole is formed.

In the embodiment, since the liner61is sandwiched between the groove contact member41and the groove insertion portion23of the pin21, contact between the liner61and steam can be suppressed and corrosion of the liner61can be suppressed.

In the embodiment, the first engaging concave portion25and the second engaging concave portion26are formed in the groove insertion portion23of the pin21, and the first engaged convex portion45and the second engaged convex portion46are formed in the groove contact member41. Thus, it is possible to attach the groove contact member41to a predetermined position in the pin21easily and accurately. Further, in the embodiment, the pair of first engaging concave portions25are formed in the groove insertion portion23of the pin21with an interval therebetween so as to be long in the pin axis direction Dp, and the pair of first engaged convex portions45entering the pair of first engaging concave portions25are formed in the groove contact member41with an interval therebetween so as to be long in the pin axis direction Dp. The liner61is arranged between the pair of first engaging concave portions25and the pair of first engaged convex portions45. Therefore, in the embodiment, it is possible to suppress the contact of the steam from both sides in the width direction of the liner61.

If the pin21is pulled from the pin groove7in a state in which a wall surface of the pin groove7and the groove contact member41stick to each other, there is a likelihood of the claw portion37of the pin21or the like being damaged and the groove contact member41being retained in the pin groove7. In the embodiment, since the second engaging concave portion26and the second engaged convex portion46are both formed so as to be long in a direction perpendicular to the pin axis direction Dp, the groove contact member41is moved in the pin axis direction Dp together with the pin21when the pin21is moved in the pin axis direction Dp. Therefore, in the embodiment, when the pin21is removed from the pin groove7and the pin insertion hole12, it is possible to reduce the likelihood of retention of the groove contact member41in the pin groove7.

In the embodiment since the sealing member75is arranged between the head flange31of the pin21and a bottom surface of the flange accommodation concave portion13of the half casing11, it is possible to prevent steam in the casing10from flowing out to the outside through the pin insertion hole12of the casing10.

In the embodiment, the deformation assistance concave portion35is formed adjacent to the portion36to be plastically deformed in the pin21. Therefore, in the embodiment, when the portion36of the pin21is plastically deformed using the tool T such as a punch, the tool T such as a punch can be easily applied to a position adjacent to the portion36of the pin21, and the portion36of the pin21can be easily plastically deformed. Thus, since the deformation assistance concave portion35is intended to allow easy plastic deformation of the portion36of the pin21using the tool T such as a punch, the deformation assistance concave portion35is not essential.

In the embodiment, since the concave surface defining the deformation assistance concave portion35forms a portion of the outer circumferential surface of the virtual cylinder Cv, the tool T such as a cylindrical or conical punch can be easily placed along the concave surface. Further, in the embodiment, since the concave surface defining the position restriction concave portion55forms a portion of the outer circumferential surface of a virtual cylinder, the claw portion37of the pin21is easily brought into close contact over a wide range of the concave surface, and a direction of position restriction of the groove contact member41by the claw portion37of the pin21can be set to various directions.

In the embodiment, since the pin pressing screw81is screwed into the flange accommodation concave portion13that communicates with the pin insertion hole12, it is possible to prevent the pin21from dropping from the pin insertion hole12. Further, in the embodiment, when the pin21inserted into the pin insertion hole12is removed, the pin pressing screw81is loosened and removed, making it possible to simply remove the pin21. Further, in the embodiment, since the loosening of the pin pressing screw81can be restricted by the loosening stop tool85, it is possible to prevent the pin21from dropping due to the dropping of the pin pressing screw81. The head of the pin21or the screw portion82of the pin pressing screw81may be caulked in the half casing11using a punch or the like.

[Modification Examples of Claw Portion and Position Restriction Concave Portion]

Next, various modification examples of the claw portion and the position restriction concave portion in the positioning device described above will be described.

The position restriction concave portion55in the embodiment is formed in a region including a corner between the convex inner surface48aof the first engaged convex portion45and the distal end surface47in the groove contact member41. Further, the claw portion37in the above embodiment is obtained by deforming the portion36facing the position restriction concave portion55in the pin21. However, the position restriction concave portion and the claw portion may be formed in another region.

Specifically, as illustrated inFIG. 20, a position restriction concave portion55cmay be formed in a region including the corner between the side surface48and the distal end surface47of the groove contact member41. In this case, a portion36cfacing the position restriction concave portion55cin the pin21is plastically deformed so that the portion36cbecomes a claw portion. A deformation assistance concave portion35cmay be formed on the side opposite to the position restriction concave portion55cwith reference to the portion36c.

Further, a position restriction concave portion55dmay be formed in a region including a corner between a projection surface48cof the first engaged convex portion45and the distal end surface47in the groove contact member41. The projection surface48cof the first engaged convex portion45is a surface facing a concave bottom surface25dof the first engaging concave portion25of the pin21. In this case, a portion36dfacing the position restriction concave portion55din the pin21is plastically deformed so that the portion36dbecomes a claw portion. Further, a deformation assistance concave portion35dmay be formed on the side opposite to the position restriction concave portion55dwith reference to this portion36d.

Further, a position restriction concave portion55emay be formed in a region including a corner between the projection surface48cof the first engaged convex portion45, the convex inner surface48aof the first engaged convex portion45, and the distal end surface47in the groove contact member41. Further, a position restriction concave portion55fmay be formed in a region including a corner between the projection surface48cof the first engaged convex portion45, the side surface48of the groove contact member41, and the distal end surface47in the groove contact member41. In these cases, portions36eand36ffacing the position restriction concave portions55eand55fin the pin21are plastically deformed, and the portions36eand36fare used as a claw portion. Further, deformation assistance concave portions35eand35fmay be formed on the side opposite to the position restriction concave portions55eand55fwith reference to the portions36eand36f.

Further, a position restriction concave portion55gmay be formed in a region including the corner between the supported surface43and the distal end surface47of the groove contact member41. In this case, a portion36gthat faces the position restriction concave portion55gin the pin21is plastically deformed, and this portion36gis used as a claw portion. Further, a deformation assistance concave portion35gmay be formed on the side opposite to the position restriction concave portion55gwith reference to this portion36g.

Here, the position restriction concave portions55and55cto55gof the embodiment and the modification examples are all formed in a region including a corner between the facing surface facing the pin21and the exposed surface other than the facing surface among the surfaces of the groove contact member41. However, the position restriction concave portion may not be formed in a region including the corner between the facing surface and the exposed surface of the groove contact member41.

More specifically, as illustrated inFIG. 21, a position restriction concave portion55hmay be formed in a region facing the outer surface24bof the pin21in the side surface48of the groove contact member41. In this case, a portion of the outer surface24bof the pin21, which is a portion36hfacing the position restriction concave portion55hin the pin21, is plastically deformed and this portion36his used as a claw portion. Further, a deformation assistance concave portion35hmay be formed on the side opposite to the position restriction concave portion55hwith reference to this portion36h.

Further, a position restriction concave portion55imay be formed in a region facing a concave side surface25cdefining the first engaging concave portion25in the pin21in the side surface48of the groove contact member41. In this case, a portion of the side circumferential surface23cof the groove insertion portion23of the pin21, which is a portion36ifacing the position restriction concave portion55iin the pin21, is plastically deformed and the portion36iis used as the claw portion. In this case, if the first engaged convex portion45of the groove contact member41is inserted into the first engaging concave portion25of the pin21, the position restriction concave portion55iof the pin21cannot be visually seen. Therefore, it is preferable for some mark to be added to the portion36ifacing the position restriction concave portion55iin the pin21.

There may be a plurality of sets of position restriction concave portions55and55cto55iand the claw portion in the above embodiment and each modification example. Further, in a case in which a plurality of sets are provided, a set shown in one modification example or the like among the embodiment and the modification examples described above and a set shown in another modification example may be combined.

The position restriction concave portions55and55cto55iin the embodiment and the modification examples are all formed on the groove contact member41side. Further, the claw portion in the embodiment and each modification example is obtained by plastically deforming a portion of the pin21. However, a position restriction concave portion may be formed on the pin21side, and a portion of the groove contact member41may be plastically deformed and used as the claw portion.

Specifically, as illustrated inFIG. 22, a position restriction concave portion55jmay be formed in a region including a corner between one of a pair of concave side surfaces25cwhich defines the first engaging concave portion25in the pin21and the distal end surface27of the pin21. Here, the one of the concave side surfaces25cis a concave side surface on the side circumferential surface23cside in the groove insertion portion23of the pair of concave side surfaces25cwhich defines the first engaging concave portion25. In this case, a region including the corner between the side surface48of the groove contact member41and the distal end surface47of the groove contact member41, which is a portion36jfacing the position restriction concave portion55jin the groove contact member41, is plastically deformed and this portion36jis used as the claw portion. Further, a deformation assistance concave portion35jmay be formed on the side opposite to the position restriction concave portion55jwith reference to this portion36j.

Further, a position restriction concave portion55kmay be formed in a region including a corner between the other of the pair of concave side surfaces25cwhich defines the first engaging concave portion25in the pin21and the distal end surface27of the pin21. In this case, a region including a corner between the convex inner surface48aof the first engaged convex portion45in the groove contact member41and the distal end surface47of the groove contact member41, which is a portion36kfacing the position restriction concave portion55kin the groove contact member41, is plastically deformed and this portion36kis used as the claw portion. A deformation assistance concave portion35kmay be formed on the side opposite to the position restriction concave portion55kwith reference to this portion36k.

Further, a position restriction concave portion55mmay be formed in a region including a corner between the concave bottom surface25ddefining the first engaging concave portion25in the pin21, the other concave side surface25c, and the distal end surface27of the pin21. Further, a position restriction concave portion55nmay be formed in a region including a corner between the concave bottom surface25ddefining the first engaging concave portion25in the pin21, the one concave side surface25c, and the distal end surface27of the pin21. In these cases, portions36mand36nfacing the position restriction concave portions55mand55nin the groove contact member41are plastically deformed, and the portions36mand36nare used as the claw portion. Further, deformation assistance concave portions35mand35nmay be formed on the side opposite to the position restriction concave portions55mand55nwith reference to the portions36mand36n.

Further, a position restriction concave portion55pmay be formed in a region including the corner between the support surface24and the distal end surface27of the pin21. In this case, a portion of the distal end surface47of the groove contact member41, which is a portion36pfacing the position restriction concave portion55p, is plastically deformed, and this portion36pis used as the claw portion. A deformation assistance concave portion35pmay be formed on the side opposite to the position restriction concave portion55pwith reference to this portion36p.

There may be a plurality of sets of position restriction concave portions55j,55k,55m,55n, and55pand the claw portion in each modification example in which the position restriction concave portion is formed on the pin21side. Further, in a case in which a plurality of sets are provided, a set shown in one modification example or the like among the modification examples and a set shown in another modification example may be combined. Further, a set shown in one modification example in which the position restriction concave portion is formed on the pin21side and a set shown in one modification example or the embodiment in which the position restriction concave portion is formed on the groove contact member41side may be combined.

[First Modification Example of Positioning Method]

A first modification example of the positioning method described above will be described with reference to a flowchart illustrated inFIG. 23.

In the positioning method of this modification example, a preparation step (S0a), the provisional positioning step (S1), the rotor arrangement step (S2), the deviation measurement step (S3), an adjusted pin assembly step (S4a), the step of provisionally holding the lower half blade ring (S5), the provisional positioning release step (S6), the positioning device attachment step (S7), and the provisional holding release step (S8) are executed similarly to the positioning method of the above embodiment. However, the preparation step (S0a) and the adjusted pin assembly step (S4a) in the positioning method of this modification example are different from the preparation step (S0) and the adjusted pin assembly step (S4) in the positioning method of the above embodiment.

In the preparation step (S0a) of this modification example, the pin21, the liner61, the groove contact member41, the sealing member75, the pin pressing screw81, and the loosening stop tool85constituting the positioning device20are prepared. However, the deformation assistance concave portion35is not formed in the pin21prepared in the preparation step (S0a) of this modification example, and the position restriction concave portion55is not formed in the groove contact member41.

In the adjusted pin assembly step (S4a) of this modification example, first, the deformation assistance concave portion35is formed in the pin21, and the position restriction concave portion55is formed in the groove contact member41(S40: concave portion formation step). Then, the liner selection step (S41) and the member assembly step (S42) are executed, similarly to the adjusted pin assembly step (S4) in the above embodiment.

Work for forming the deformation assistance concave portion35in the pin21or work for forming the position restriction concave portion55in the groove contact member41is work that can be performed relatively easily in an assembly site for a steam turbine or the like. Therefore, as in this modification example, in the preparation step (S0a), the pin21having no deformation assistance concave portion35formed therein and the groove contact member41having no position restriction concave portion55formed therein may be prepared, and the concave portions35and55may be formed in the adjusted pin assembly step (S4a).

Although the liner selection step (S41) is executed after the concave portion formation step (S40) in this modification example, the concave portion formation step (S40) may be executed after the liner selection step (S41). That is, the concave portion formation step (S40) may be performed at an arbitrary stage as long as the concave portion formation step (S40) is before the member assembly step (S42).

Further, this modification example is an example in which the deformation assistance concave portion35is formed on the pin21side, and the position restriction concave portion55is formed on the groove contact member41side. However, in this modification example, the deformation assistance concave portion may be formed on the groove contact member41side and the position restriction concave portion may be formed on the pin21side.

[Second Modification Example of Positioning Method]

A second modification example of the positioning method described above will be described with reference to a flowchart illustrated inFIG. 24.

The positioning method in this modification example is a modification of the adjusted pin assembly step (S4) in the positioning method of the above embodiment, and the other steps are the same as in the positioning method of the above embodiment.

In an adjusted pin assembly step (S4b) of this modification example, the liner selection step (S41) and the member assembly step (S42) are executed, similarly to the adjusted pin assembly step (S4) of the above embodiment.

In the adjusted pin assembly step (S4b) of this modification example, thereafter, assembly confirmation of whether the liner61and the groove contact member41are firmly attached to the pin21and whether an interval between the groove contact surfaces42of the pair of groove contact members41is an appropriate size is performed (S43: assembly confirmation step). If it is confirmed in this assembly confirmation step (S43) that the assembly is OK, the process proceeds to the step of provisionally holding the lower half blade ring (S5).

On the other hand, if it is not confirmed in this assembly confirmation step (S43) that the assembly is OK, the adjusted pin21bassembled in the member assembly step (S42) is disassembled (S44: disassembly step). In the disassembly of the adjusted pin21b, the claw portion37formed through plastic deformation is cut using a tool such as a punch or a chisel, and the groove contact member41is separated from the pin21.

After the disassembly step (S44), a position restriction concave portion55is formed at a position different from the position restriction concave portion55formed previously in the groove contact member41, and a new deformation assistance concave portion35is formed at a position adjacent to the position restriction concave portion55newly formed in the pin21(S40b: concave portion formation step). Then, after a liner selection step (S41b) is executed as necessary, a member assembly step (S42b) is executed. In this member assembly step (S42b), a portion facing the position restriction concave portion55newly formed in the groove contact member41is plastically deformed, and this portion is inserted, as a claw portion, into the position restriction concave portion55newly formed in the pin21.

After this member assembly step (S42b), the assembly confirmation step (S43) is executed again, and if it is confirmed in the assembly confirmation step (S43) that the assembly is OK, the process proceeds to the step of provisionally holding the lower half blade ring (S5).

Although the liner selection step (S41b) is executed after the concave portion formation step (S40b) in this modification example, the concave portion formation step (S40b) may be performed after the liner selection step (S41b). That is, the concave portion formation step (S40b) may be performed at an arbitrary stage as long as the concave portion formation step (S40b) is before the member assembly step (S42b). Further, if the groove contact member41having the spare position restriction concave portion55formed therein and the pin21having the spare deformation assistance concave portion35formed therein are prepared in the preparation step (S0), it is not necessary to execute the concave portion formation step (S40b) in the adjusted pin assembly step (S4b).

Further, this modification example is an example in which the deformation assistance concave portion35is formed on the pin21side, and the position restriction concave portion55is formed on the groove contact member41side. However, in this modification example, the deformation assistance concave portion may be formed on the groove contact member41side, and the position restriction concave portion may be formed on the pin21side.

[Third Modification Example of Positioning Method]

A third modification example of the positioning method described above will be described with reference to a flowchart illustrated inFIG. 25.

In the positioning method of this modification example, a preparation step (S0c), the provisional positioning step (S1), the rotor arrangement step (S2), the deviation measurement step (S3), an adjusted pin assembly step (S4c), the step of provisionally holding the lower half blade line (S5), the provisional positioning release step (S6) the positioning device attachment step (S7), and the provisional holding release step (S8) are executed, similarly to the positioning method in the above embodiment. However, the preparation step (S0c) and the adjusted pin assembly step (S4c) in the positioning method of this modification example are different from the preparation step (S0) and the adjusted pin assembly step (S4) in the positioning method of the above embodiment.

In the preparation step (S0c) of this, modification example, the groove contact member41, the sealing member75, the pin pressing screw81, and the loosening stop tool85are prepared. On the other hand, in the preparation step (S0c) of this modification example, the liner61is not prepared.

In the adjusted pin assembly step (S4c) of this modification example, the thickness of the groove contact member41is adjusted to a thickness according to the deviation amount measured in the deviation measurement step (S3) (S41c: thickness adjustment step). Here, the thickness of the groove contact member41is an interval between the groove contact surface42and the supported surface43of the groove contact member41. In the thickness adjustment step (S41c), basically, the thickness is adjusted by cutting the groove contact surface42of the groove contact member41. Therefore, the thickness of the groove contact member41prepared in the preparation step (S0c) is greater than the thickness of the groove contact member41for which the use of the liner61is assumed.

In the adjusted pin assembly step (S4c), after the thickness adjustment step (S41c), a member assembly step (S42c) is executed. In this member assembly step (S42c), the groove contact member41is attached to the pin21without arranging the liner61between the groove insertion portion23of the pin21and the groove contact member41. Thus, the adjusted pin assembly step (S4c) is completed.

In the embodiment and each modification example, the groove contact member41is used as a liner presser that presses the liner61. However, in this modification, example, the groove contact member41is used as a liner. If the groove contact member41is used as a liner as in this modification example, it is possible to further reduce the number of components of the positioning device. However, when the groove contact member41is used as a liner, it is necessary to execute the thickness adjustment step (S41c) at a site or the like at which the steam turbine is assembled, which increases time and effort taken at the site. Therefore, it is preferable to determine whether to use the groove contact member41as the liner presser or as a liner by comparing a reduction in the number of components with an increase in time and effort on the site.

Even when the groove contact member41is used as a liner as in this modification example, the concave portion formation step (S40) may be performed in the adjusted pin assembly step as in the first modification example. Further, even when the groove contact member41is used as a liner, the assembly confirmation step (S43), the subsequent disassembly step (S44), or the like may be performed in the adjusted pin assembly step, as in the second modification example. However, in this case, the liner selection step (S41and S41b) in the adjusted pin assembly step in the second modification example is replaced with the thickness adjustment step. Further, in this modification example, the deformation assistance concave portion may be formed on the groove contact member41side and the position restriction concave portion may be formed on the pin21side.

In the above embodiment, the engaging portions (the first engaging concave portion25and the second engaging concave portion26) of the pin21are concave portions, and the engaged portions (the first engaged convex portion45and the second engaged convex portion46) of the groove contact member41are convex portions. However, conversely, the engaging portions of the pin21may be convex portions, and the engaged portions of the groove contact member41may be concave portions.

In the above embodiment, the two first engaging concave portions25are formed in the pin21, and the two first engaged convex portions45are formed in the groove contact member41. However, there may be one first engaging concave portion25or there may be no first engaging concave portions. Further, there may be one first engaged convex portion45or there may be no first engaged convex portions according to the number of the first engaging concave portions25. Further, there may be no second engaging concave portion26and second engaged convex portion46in the above embodiment.

The convex insertion portion63of the liner61in the embodiment is a hole formed in the liner61. However, this convex insertion portion63need not be a hole as long as the second engaged convex portion46of the groove contact member41can be inserted. For example, the convex insertion portion63may be a notch formed in the liner61. Further, as described above, when the second engaged convex portion46of the groove contact member41is omitted, it is not necessary to form the convex insertion portion63in the liner61.

In the above embodiment, the liner61is arranged between the first groove contact member41aand the groove insertion portion23of the pin21and between the second groove contact member41band the groove insertion portion23of the pin21. However, according to the deviation amount in the horizontal direction Dh measured in the above-described deviation measurement step (S3), the liner61may be arranged only either between the first groove contact member41aand the groove insertion portion23of the pin21or between the second groove contact member41band the groove insertion portion23of the pin21.

In the above embodiment, the pin pressing screw81is used for preventing the pin21from dropping from the pin insertion hole12. However, the head of the pin21may be welded to the half casing11instead of using the pin pressing screw81.

In the above embodiment, the tapered reception surface20is formed on the distal end side in the pin21, and the tapered contact surface52is formed on the base end side in the groove contact member41. The tapered reception surface29and the tapered contact surface52serve to restrict the relative movement of the groove contact member41to the base end side with respect to the pin21, and restrict the relative movement thereof to the side away from the support surface24of the pin21. However, the tapered reception surface may not be formed in the pin and the tapered contact surface may not be formed in the groove contact member.

In this case, for example, a base end surface51xdirected to the base end side and connecting the groove contact surface42and the supported surface43is formed on the base end side in a groove contact member41x, as illustrated inFIG. 26. This base end surface51xmay be a surface perpendicular to the groove contact surface42and the supported surface43of the groove contact member41xor may be an inclined surface or an uneven surface. On the other hand, an axial movement restriction surface28xand a separation movement restriction surface29xare formed on the distal end side in an insertion portion22xof a pin.21x. The axial movement restriction surface28xis a surface directed to the distal end side and facing the base end surface51xof the groove contact member41x. The separation movement restriction surface29xis a surface facing the groove contact surface42of the groove contact member41xand directed toward the groove insertion portion23in a direction intersecting the pin axis Ap. An interval between the separation movement restriction surface29xof the insertion portion22xin the pin21xand the support surface24of the groove insertion portion23in the pin21xis greater than an interval between the groove contact surface42and the supported surface43of the groove contact member41x. As described above, by constituting the groove contact member41xand the pin21x, relative movement of the groove contact member41xto the base end side with respect to the pin21xcan be restricted by a relationship between the base end surface51xof the groove contact member41xand the axial movement restriction surface28xof the pin21x. Further, relative movement of the groove contact member41xto a side away from the support surface24of the pin21xcan be restricted by a relationship between the groove contact surface42of the groove contact member41xand the separation movement restriction surface29xof the pin21x. In this example, the separation movement restriction surface29xof the pin21xfaces the groove contact surface42of the groove contact member41x. However, when the base end surface51xof the groove contact member41xhas a convex portion in the axial direction, the separation movement restriction surface29xof the pin21xmay face the convex portion of the groove contact member41x.

The pin insertion hole12formed in the half casing11of the above embodiment is a hole penetrating the half casing11from the inner circumferential side to the outer circumferential side thereof. However, as illustrated inFIG. 27, a pin insertion hole12ymay not penetrate the half casing11as long as the pin insertion hole12yis recessed from the inner circumferential side to the outer circumferential side of the half casing11. In this case, a head flange is not formed in an insertion portion22yof a pin21y. Further, in this case, a length of the insertion portion22yin the pin axis direction Dp is equal to or slightly greater than a depth of the pin insertion hole12y. Thus, if the pin insertion hole12ydoes not penetrate the half casing11, it is not necessary to take into account leakage of fluid from the inner circumferential side to the outer circumferential side of the half casing11or dropping of the pin21y. Thus, when the pin insertion hole12ydoes not penetrate the half casing11, the rotor arrangement step (S2) is performed after the positioning device attachment step (S7) in the positioning methods described inFIGS. 14, 23, and 25. This is because the pin21ycannot be inserted into the pin insertion hole12yif the rotor1is arranged, as the pin21yis inserted into the pin insertion hole12yfrom the inner circumferential side of the half casing11.

The positioning device20of the above embodiment determines a relative position of the half blade ring6serving as an inner member with respect to the half casing11serving as an outer member. However, the present invention is not limited thereto, and the outer member need not be the half casing11as long as the outer member extends in the circumferential direction Dc around the rotation axis Ar. Further, similarly, the inner member need not be the half blade ring6as long as the inner member is arranged on the inner circumferential side of the outer member and extends in the circumferential direction Dc around the rotation axis Ar. Further, the present invention may be applied to other rotary machines such as gas turbines or compressors, in addition to steam turbines.

INDUSTRIAL APPLICABILITY

According to an aspect of the present invention, it is possible to reduce the number of components of the positioning device.

REFERENCE SIGNS LIST