JP5615167B2 - Assembly method and jig for turbine shaft seal - Google Patents

Description

  The present invention relates to a shaft seal mounting method and jig applied to low-pressure and high-medium pressure steam turbines.

Conventionally, during the regular inspection work of a steam turbine, flushing of a water piping system and a lubricating oil piping system is performed for the purpose of cleaning up ancillary equipment. In performing flushing of the water piping system, it is necessary to keep the turbine casing in a vacuum in order to remove oxygen in the water.
On the other hand, in order to shorten the start-up time of the steam turbine, at the beginning of the start-up, the ground piping is not introduced into the steam turbine, the steam turbine is kept vacuum while the steam turbine is stopped, and the water piping system is maintained. And a start-up method in which the flushing operation of the lubricating oil piping system is performed in parallel at the same time. In this method, a simple shaft seal is provided in the ground portion of the steam turbine to prevent the atmosphere from leaking into the passenger compartment of the steam turbine, and the flushing of the water piping system and the flushing of the lubricating oil piping system are performed simultaneously. The startup time can be shortened accordingly. After the flushing of the lubricating oil piping system is completed, the rotor is rotated at a low speed to introduce ground steam into the gland portion, and the water piping system is continuously flushed.

Patent Document 1 shows an example of the above-described shaft seal. FIG. 15 shows a schematic structure thereof. A shaft seal 80 shown in FIG. 15 is provided at the end of the gland portion 7 of the steam turbine, and mainly includes a housing 81 and a seal material 83. The shaft seal 80 is fixed to the ground portion 7 by the housing bolt 14 via the housing 81. A seal member 83 having a hollow portion 84 in a groove portion 82 provided in the housing 81 is arranged around the rotary shaft 6 in an annular shape, and a connection port 15 for receiving the pressurized fluid PG from the outside is provided at the top of the housing 81. ing. The sealing material 83 and the connection port 15 are connected and integrated via the supply path 16 so that the pressurized fluid PG can be received from an external supply source (not shown). The sealing material 83 is formed of an elastic material such as synthetic rubber, and includes a hollow portion 84 formed in an annular shape in the circumferential direction of the rotation shaft. The shaft seal 80 receives the pressurized fluid PG in the hollow portion 84 via the supply path 16 and expands the seal material 83, and the seal material 83 expands and is pressed against the inner wall of the rotary shaft 6 and the groove portion 82 of the housing 81. A seal material 83 seals between the passenger compartment side and the atmosphere side of the steam turbine. With this structure, the inflow of air from the atmosphere side to the turbine casing side is blocked, and the turbine casing side vacuum is maintained.

Japanese Patent Publication No. 6-80283

However, in the case of a steam turbine to which the above-described shaft seal is applied, a bearing box or the like may be disposed close to the front side in the axial direction of the rotation shaft of the shaft seal attached to the turbine body. In such a case, since the work space is narrow, it is difficult to attach and detach the shaft seal from the axial direction, and there is a problem that maintenance of the shaft seal is not easy.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a turbine shaft seal assembling method and jig that facilitate attachment / detachment of a shaft seal in a steam turbine having a limited work space.

The present invention employs the following means in order to solve the above problems.
That is, the method for assembling a turbine shaft seal according to the present invention is a turbine shaft seal provided in a ground portion of a turbine and arranged in an annular shape around a rotation shaft, and the shaft seal is the center of the rotation shaft. And a housing having a U-shaped seal plate disposed in a groove portion that is open in a direction, and the housing is formed of a side plate and a base, and the side plate is integrally formed with an upper half housing that is detachable in the axial direction. A turbine shaft seal which is formed from a lower half housing formed and receives pressurized fluid from the outside into the housing and seals the rotating shaft, wherein the seal plate is attached from the circumferential direction of the rotating shaft. A first jig provided with a chevron shape that is inserted into a groove portion of a lower half housing and protrudes radially inward and outward in a sectional view in the axial direction in a gap between the seal plate and the ceiling surface of the groove portion. Is inserted in the circumferential direction of the rotating shaft, the seal plate is moved along the side surface of the groove portion in the radial direction while moving the first jig in the circumferential direction, and the pressurized fluid is transferred to the groove portion. The seal plate is received and pressed inward in the radial direction to bring the seal plate into contact with the outer surface of the rotating shaft.

According to the present invention, even when the seal plate cannot be inserted into the housing from the axial direction due to a narrow work space, the seal plate is inserted from the circumferential direction and the first jig is inserted from the circumferential direction. Thus, the seal plate can be easily disposed at a predetermined position.

In the turbine shaft seal assembly method according to the present invention, before inserting the first jig into the groove portion, a thin long plate is provided in a gap between the seal plate disposed in the groove portion and the ceiling surface. It is desirable that an end portion of the third jig is inserted in the circumferential direction along the ceiling surface, and the third jig is disposed over the entire circumferential length of the lower half housing.

According to the present invention, the insertion and movement of the first jig is further facilitated by using the third jig.

In the turbine shaft seal assembling method according to the present invention, the first engagement means provided at one end of the third jig is connected to the second engagement means provided in the housing, and the third jig is attached. It is desirable to insert the third jig into the groove after engaging the upper half housing.

According to the present invention, since the third jig is fixed to the housing, even when the first jig is inserted, the third jig does not rotate, so that the first jig can be easily inserted.

In the method for assembling the turbine shaft seal according to the present invention, it is desirable to insert the seal plate into the wide portion of the ceiling surface of the groove.

According to the present invention, since the seal plate can be inserted into the wide portion, it is easier to insert the seal plate.

According to the turbine shaft seal assembly method of the present invention, the seal plate is disposed in the lower half housing, and then, on the outer surface of the rotation shaft of the upper half housing, along the circumferential direction of the rotation shaft. An excess seal plate is disposed so as to make one turn around the rotation shaft, and the seal plate is formed into an annular seal plate by joining both end faces of the seal plate. Folding the flange portion of the second jig provided with a shaped insertion portion along the intermediate edge, the flange portion is disposed so as to be on the near side in the axial direction of the rotating shaft with respect to the ground portion of the turbine, The insertion portion of the second jig is inserted from the gap between the seal plate and the outer surface of the rotating shaft toward the ground portion in the axial direction of the rotating shaft, and the flange portion is a shaft of the upper half housing. The side plate is attached to the base from the axial direction so as to be arranged outside in the direction, and the front It is desirable to pull out the second jig while grasping the flange portion above the radial direction from the upper half housing.

According to the present invention, since the seal plate can be attached from the axial direction in the upper half housing, it is easy to attach the seal plate and the second jig is used. Can be adjusted to an appropriate length.

The first jig used in the method for assembling the turbine shaft seal in the present invention includes a pushing-up portion having a chevron shape protruding inward and outward in the radial direction in an axial sectional view, and a radial height of the pushing-up portion. An attachment portion extending in the longitudinal direction from the center of the jig, and a jig main body formed from the center, extending in the longitudinal direction adjacent to the jig main body, and one end of the jig main body through the attachment portion. And a long handle portion detachably engaged with the head.

According to the present invention, the jig can be moved smoothly and easily in the circumferential direction of the groove of the narrow housing, and the seal plate can be easily attached.

In the first jig used in the method of assembling the turbine shaft seal in the present invention, the push-up portion is provided integrally with the push-up portion on the opposite side of the attachment portion in the longitudinal direction, and extends in the longitudinal direction. It is desirable to have a guide part in the shape of a circle.

  According to the present invention, since the first jig includes the guide portion, the first jig can be easily inserted into the gap between the ceiling surface of the groove portion and the seal plate, and the first jig can be smoothly inserted into the groove portion. You can move in.

  As for the 1st jig | tool used for the assembly | attaching method of the shaft seal for turbines in this invention, it is desirable for the said raising part to be equipped with the height of the radial direction corresponded at least to a seal | sticker upper limit position depth.

According to the present invention, since the seal plate can be disposed at a predetermined position at the time of attachment, the space of the groove portion can be reliably sealed.
Here, the seal upper limit depth is a value determined by subtracting the opening end straight part length h2 of the groove part and the thickness t1 of the seal plate from the groove depth h1 of the groove part.

As for the 1st jig | tool used for the assembly | attaching method of the shaft seal for turbines in this invention, it is desirable for the said handle part to be formed from the elongate thin plate of at least 2 sheet pile.

According to the present invention, since the handle portion is a stack of two thin plates, the first jig can be easily handled and the first jig can be moved smoothly in the groove portion, so that the seal plate can be easily attached.

The second jig used in the method of assembling the turbine shaft seal in the present invention includes an arcuate outer edge forming an outer circumferential circle, an arcuate intermediate edge forming an inner circumferential circle, and two sides forming a radius. A fan-shaped collar part surrounded by an edge and a thin strip-shaped insertion part extending from the collar part toward the inner edge toward the center in the radial direction and having a sheet width shorter than the arc length of the intermediate edge. The flange portion and the insertion portion have a structure that can be folded back from each other with the intermediate edge as a boundary.

According to the present invention, the deflection of the seal plate is made uniform in the circumferential direction, the adjustment of the installation length of the seal plate is simplified, the seal plate can be properly disposed in the groove portion of the housing, and the shaft seal with no leakage is provided. Installation is possible.

According to the above-described present invention, since the seal plate can be inserted from the circumferential direction, the maintenance work of the shaft seal is facilitated even in a steam turbine having only a narrow work space.

FIG. 1 shows an example of a structural cross section of a steam turbine. FIG. 2 shows a cross section of the main part of the upper half housing of the shaft seal. FIG. 3 shows a cross section of the main part of the lower half housing of the shaft seal. FIG. 4 shows a cross section of the groove. Fig.5 (a) shows the modification of a groove part cross section, and FIG.5 (b) shows the other modification of a groove part cross section. FIG. 6A shows the appearance of the seal plate, and FIG. 6B shows a cross section of the seal plate. FIG. 7 shows a front view of the shaft seal as viewed from the axial direction of the rotating shaft. Fig.8 (a) shows the front view of a 1st jig | tool, FIG.8 (b) shows a top view. Fig.9 (a) shows the front view of the modification of a 1st jig | tool, FIG.9 (b) shows a top view. FIG. 10 shows the relative positional relationship between the first jig and the seal plate in the groove. FIG. 11 shows the appearance of the second jig. FIG. 12 shows the appearance of the third jig. FIG. 13 shows how to install the shaft seal. FIG. 14 shows how to attach the second jig. FIG. 15 shows an example of a cross section of a conventional turbine shaft seal.

  Embodiments of a shaft seal and a steam turbine including the shaft seal according to the present invention will be described below with reference to FIGS. The shaft seal according to the present invention relates to a shaft seal that is easily used during a flushing operation when the steam turbine is started. The main shaft seal is removed when flushing is completed and normal operation is started.

  FIG. 1 shows an example of a structural cross section of a steam turbine in which a shaft seal is installed. FIG. 1 shows an example of a low-pressure steam turbine, in which steam is supplied from a steam inlet 3 provided immediately above the center of a casing 2 of the steam turbine 1 and separated into left and right by a turbine section 4 and discharged into an exhaust chamber 5. Thus, when passing through the stationary blade and the moving blade (not shown), the kinetic energy of the steam is converted into rotational energy, the rotating shaft 6 is rotated, and the electric power is converted into electric power by a generator (not shown).

The shaft seal 10 according to the present embodiment is provided between a gland portion 7 that seals the turbine portion 4 in the casing 2 and a bearing box 9 having a built-in bearing 8 when the steam turbine is started. It is arrange | positioned at the terminal. The shaft seal 10 is used at the time of flushing work when starting the steam turbine, and is removed when the flushing work is completed.

A housing 11 that constitutes a main part of the shaft seal 10 is divided into an upper half housing 12 and a lower half housing 13 in the horizontal plane of the ground portion 7. FIG. 2 shows a cross section of the main part of the upper half housing 12 of the shaft seal 10 according to this embodiment, and FIG. 3 shows a cross section of the main part of the lower half housing 13.

The upper half housing 12 shown in FIG. 2 mainly includes a housing main body 20 including a base portion 22 and a side plate 23 and a seal plate 21, and the housing main body 20 is attached to the ground portion 7 of the steam turbine 1. The housing body 20 includes a groove portion 31 that is annularly disposed around the rotation shaft 6 and opens in the center direction of the rotation shaft 6. The groove portion 31 is an annular space formed by combining the base portion 22 and the side plate 23, and is sandwiched between the side surface 35 on the base portion 22 side and the side surface 35 on the side plate 23 side in the vicinity of the opening end 33 of the groove portion 31. A plate 21 is arranged. Further, the lower surface of the seal plate 21 is in contact with the outer surface of the rotating shaft 6, and the end surface 21 d (FIG. 6B) in the width direction of the seal plate 21 is in contact with the base 22 and the side surface 35 of the side plate 23. Further, the side plate 23 includes a connection port 15 that receives the pressurized fluid PG from an external supply source (not shown) at the top, and includes a supply path 16 that communicates the space between the connection port 15 and the groove 31.

The base 22 and the side plate 23 constituting the housing main body 20 have a structure that can be attached and detached in the axial direction of the rotary shaft 6. That is, the base portion 22 constitutes a main portion of the housing body 20 of the upper half housing 12 and is attached to the ground portion 7 from the axial direction by the housing bolt 14. The side plate 23 is fixed to the base portion 22 by side plate bolts 25 in the axial direction of the rotary shaft 6. The side plate 22 may be a single semicircular arc or may be divided into a plurality of pieces in the circumferential direction.

3 is the same as the structure of the upper half housing 12 shown in FIG. 2 except that the lower half housing 13 has a structure in which the housing body 20 is integrated. That is, the housing main body 20 shown in FIG. 3 is formed as a single piece, and includes a groove portion 31 that opens in the center direction of the rotating shaft 6, and the groove portion 31 includes a wide portion 32 in the vicinity of the ceiling surface 34 of the groove portion. The groove width 32 is larger than the plate width of the seal plate 21. Further, the groove width in the vicinity of the opening end 33 of the groove portion 31 is made smaller than the plate width of the seal plate 21, and the side surface 35 facing the groove portion 31 is inclined from the wide portion 32 toward the opening end 33 to gradually open the groove portion 31. A structure for narrowing the groove width toward the end 33 is provided.

FIG. 4 shows a cross section of the groove 31 of the housing body 20 according to this embodiment. FIG. 4 shows a case where the housing body 20 is divided into a base portion 22 and a side plate 23 and includes a dividing surface 24 in the case of the upper half housing. The groove portion 31 formed by the base portion 22 and the side plate 23 is formed as a space surrounded by the base portion 22 and the side surface 35 of the side plate 23 provided in the axial direction so as to face the ceiling surface 34 on the outer side in the radial direction. By disposing the seal plate 21 in the vicinity of the opening end 33, a closed space is formed in the groove.

The groove portion 31 includes a wide portion 32 having a groove width larger than the plate width of the seal plate 21 in the axial direction in the vicinity of the radially outer ceiling surface 34 in the groove portion, and an opening end 33 closest to the rotating shaft 6. The groove width is made smaller than the plate width of the seal plate 21. Further, the radial depth of the wide portion 32 formed by the base portion 22 in the vicinity of the ceiling portion and the both side surfaces 35 of the side plate 23 is larger than the thickness of the seal plate 21. Both side surfaces 35 of the wide portion 32 include wide straight portions 36 that are parallel to each other and that are perpendicular to the rotation shaft 6. Furthermore, an intermediate inclined portion 37 whose groove width gradually narrows from the wide portion 32 toward the opening end 33 is provided, and the opening end 33 is perpendicular to the rotary shaft 6 and parallel to each other so that the seal plate 21 can be pinched. It is desirable to provide a straight portion 38. By providing the opening end straight portion 38 in the vicinity of the opening end 33, the seal plate 21 is held by the side surface 35 of the opening end straight portion 38 to prevent the pressurized fluid PG from leaking from the groove portion 31 to the atmosphere side. .

  As shown in FIG. 4, the groove width L of the opening end 33 of the groove portion 31 is desirably smaller than the plate width m of the seal plate 21. As a result, the sealing plate 21 disposed at the opening end 33 of the groove portion 31 receives a slight compressive force from the side surface 35 of the opening end 33 at the end surfaces 21d on both sides of the plate width, and is applied to the side surface 35 of the opening end 33. It is pinched. Since the housing main body 20 disposed in the lower half housing 13 is formed as a single body, the other configuration except for the dividing surface 24, the base 22 and the side plate 23 is shown in the cross-sectional view shown in FIG. 4 can be applied as it is.

Fig.5 (a) shows the modification of a groove part cross section. This modification has the same configuration as the groove section shown in FIG. 4 except that the wide straight portion is not provided. Since the groove portion does not include the wide linear portion, it is desirable that the groove width of the wide portion 32 is larger than the groove width of the wide portion 32 shown in FIG. 4A to facilitate the insertion of the seal plate.

FIG. 5B shows another modification of the groove section. This modification shows an example in which the groove portion 31 includes the base portion 22 and the side plate 23 and is applied to the groove portion 31 of the upper half housing 12 in which the housing body 20 can be divided into two. In the present modification, the same configuration as that of the groove section shown in FIG. 4 can be applied except that the groove width of the groove section 31 is formed with the same width from the ceiling surface 34 to the opening end 33. This modification includes an intermediate inclined portion in which the side surface 35 of the groove 31 narrows the groove width from the ceiling surface 34 toward the opening end 33 as compared with the embodiment and the modification shown in FIG. 4 or FIG. Since there is no groove, the groove processing is easy and the processing cost is low.

  In addition, although the Example and modification shown to FIG. 4 and FIG. 5 (a) are examples in which the groove part was provided with the opening end linear part, it is a side surface which consists of an intermediate | middle inclined part from the ceiling surface of a groove part to the terminal of an opening end. It is formed and it is not necessary to provide an opening end straight part. If the groove width in the axial direction of the opening end is made smaller than the plate width of the seal plate, the side surface of the opening end and the end surface of the seal plate come into contact with each other, and the space of the groove portion can be reliably sealed.

FIG. 6A shows the appearance of the seal plate, and FIG. 6B shows a cross section of the seal plate. The seal plate 21 is formed of an elastic material having a U-shaped cross section, has a cross section with a plate width m and thicknesses t1 and t2, and is formed in an annular shape around the rotary shaft 6. Since the seal plate 21 is used at a temperature close to room temperature, an inexpensive and elastic material such as a commercially available synthetic rubber can be applied.

The outer surface 21 a of the annular seal plate 21 faces the space side of the groove 31, and the inner surface 21 b is disposed in contact with the surface of the rotating shaft 6. The outer surface 21a of the seal plate 21 is provided with protrusions 21c projecting to the space side of the groove 31 over the entire length in the longitudinal direction at both ends in the plate width direction, and the thickness of the central portion of the plate width m of the seal plate 21 is provided. The thickness t2 of the both end faces 21d is made larger than the thickness t1. With this configuration, the seal plate 21 is U-shaped with a cross section recessed near the center of the plate width to ensure the radial seal length of the end surface, and the side surface 35 of the groove 31 and the seal plate 21. The sealing property with the end surface 21d of the first is improved.

  Further, the thickness t2 of the seal plate needs to be larger than at least the clearance C (FIG. 4) between the inner end face of the opening end 33 of the groove and the surface of the rotating shaft. This is because when the thickness t2 of the seal plate is small, it is difficult to seal the pressurized fluid with the seal plate. If the thickness t1 of the central portion of the seal plate is larger than the clearance C, the seal can be more reliably sealed.

As shown in FIG. 6B, the end surface 21d of the seal plate 21 may be provided with an inclined surface having a cross section that widens from the inner surface 21b toward the outer surface 21a, or is perpendicular to the rotating shaft 6 and is flat. An end face 21d may be provided.

On the other hand, the seal plate 21 is formed of a single strip-shaped seal plate without providing a dividing surface in the longitudinal direction, and the end is fixed using an adhesive or the like, and formed into an annular seal plate as a whole. Prevents leakage from the plate itself.

  FIG. 7 is a front view of the shaft seal as viewed from the axial direction of the rotating shaft. In the present embodiment, the housing 11 of the shaft seal 10 is divided into two, and is divided into an upper half housing 12 and a lower half housing 13 that are annularly arranged around the rotation shaft. In the upper half housing 12, the housing main body 20 is composed of a base portion 22 and a side plate 23, arranged in an annular shape around the rotation axis, and fixed to the ground portion 7 with a housing bolt 14 in the axial direction. The side plate 23 is fixed to the base portion 22 in the axial direction by side plate bolts 25. Since the lower half housing 13 has an integrated structure, the housing main body 20 is fixed to the ground portion 7 from the axial direction by the housing bolt 14.

Further, a connection port 15 for receiving the pressurized fluid PG is provided near the top of the upper half housing 12. The upper half housing 12 includes a supply path 16 that connects the connection port 15 and the groove 31 in order to supply the pressurized fluid PG to the groove 31. Although FIG. 7 shows an example in which the connection port 15 is one place, two or more connection ports may be provided. A drain port 27 is provided in the lower part of the lower half housing 13 so that the accumulated matter such as water accumulated in the groove 31 can be discharged. The upper half housing 12 and the lower half housing 13 are fastened together by fastening bolts 26 at the horizontal dividing surface 17. Similarly, the base 22 and the side plate 23 of the upper half housing 12 are fastened to the lower half housing 13 by fastening bolts 26 on the horizontal dividing surface 17 to form an integrated annular housing.

  When the pressurized fluid PG is supplied to the groove portion 31 and the inside of the groove portion 31 is pressurized, the seal plate 21 receives fluid pressure on the outer surface 21a facing the space on the groove portion side and is pressed inward in the radial direction. The inner surface 21b is pressed against the rotating shaft 6. As a result, a seal surface is formed between the inner surface 21b of the seal plate 21 and the outer surface of the rotating shaft 6, the space between the steam turbine casing side and the atmosphere side (FIG. 2) is sealed, and the atmosphere is the casing side. The inside of the passenger compartment is maintained in a vacuum.

Next, jigs used in the method for assembling and removing the shaft seal of this embodiment will be described below. In this embodiment, three types of jigs are used, and all of these jigs are used when the seal plate is attached to or removed from the lower half housing.

First, the first jig (push-up jig) will be described below.
FIG. 8A shows a front view of the first jig 50. Fig.8 (a) is the front view which inserted the 1st jig | tool in the housing and looked at the groove part from the axial direction of the rotating shaft. FIG. 8B is a plan view of the first jig, and corresponds to a diagram in which the axial center direction is viewed from the radial direction of the rotating shaft.

The first jig 50 is brought into contact with the outer surface of the rotary shaft 6 with the seal plate 21 held between the side surfaces (open end straight portions 38) on both sides in the width direction at the opening end 33 of the groove. Used to hold the seal plate 21. That is, the seal plate 21 inserted into the wide portion 32 in the groove 31 from the circumferential direction of the rotary shaft 6 moves in the groove 31 in the radial inner direction (center direction) until it contacts the outer surface of the rotary shaft 6. In the process, the first jig 50 is required when the seal plate 21 maintains a substantially parallel posture without being inclined in the plate width direction and moves to a predetermined position at the time of attachment.

  The 1st jig | tool 50 is comprised from the jig | tool main body 51 and the handle part 52, as shown to Fig.8 (a). Both the jig body 51 and the handle portion 52 are preferably made of a material having excellent lubricity and flexibility such as Teflon (registered trademark) and a light weight. The jig main body 51 is formed as a single piece of a strip-like long plate, and includes a push-up portion 53, a mounting portion 55, and a guide portion 54. A thin plate-shaped guide portion 54 extends in the longitudinal direction from the vicinity of the radial thickness of one end portion of the push-up portion 53, and near the center of the radial thickness of the other end portion of the push-up portion 53. Is provided with an attachment portion 55 that engages the handle portion 52.

The jig body 51 is a front view shown in FIG. 8A, and includes a push-up portion 53 having the largest thickness at the middle portion of the entire length in the longitudinal direction and protruding outward and inward in the radial direction. Before and after the push-up portion 53 in the longitudinal direction, a guide portion 54 and a mounting portion 55 that are thinner than the push-up portion 53 extend in the longitudinal direction from the vicinity of the center of the radial thickness of the push-up portion 53. That is, the jig body 51 has a mountain shape in which the central portion of the push-up portion 53 protrudes upward (outside in the radial direction) and down (inside in the radial direction), and the skirt extends from the push-up portion 53 in the longitudinal direction in the longitudinal direction. I have.

The guide portion 54 of the jig main body 51 is desirably extended in the longitudinal direction with a thickness smaller than that of the push-up portion 53 in FIG. That is, in a cross-sectional view of the jig main body 51, a thin plate-like guide portion 54 extends from the push-up portion 53 from the vicinity of the center in the radial direction with respect to the push-up portion 53, and the extremely thick portion of the push-up portion 53 is at the top and bottom A shape with an expanded skirt of the mountain shape is formed (inside and outside in the radial direction). That is, when the entire shape of the jig main body 51 is externally seen, the guide portion 54 is made thinner than the extremely thick push-up portion 53, and the concave portions 56 are formed on the upper and lower sides of the guide portion 54. By having such a cross-sectional shape, when the first jig moves in the circumferential direction along the ceiling surface 34 of the groove portion, the tip of the guide portion 54 interferes with the ceiling surface 34 and the side surface 35 of the groove portion of the housing 11. The movement of the first jig in the circumferential direction in the groove is smooth.

It is desirable that the length in the longitudinal direction of the thickest region of the push-up portion 53 is approximately the same as the radial height h3 of the push-up portion 53. Thereby, it becomes easy to move the seal plate 21 to a predetermined position in the groove at the extremely thick portion of the push-up portion 53. However, as long as the seal plate 21 is moved to a predetermined position in the groove portion at the extremely thick portion of the push-up portion 53 and can be held at that position, the length of the region with the largest plate thickness of the push-up portion 53 is further shortened. Also good. If the region of the push-up portion 53 having the maximum maximum height h3 is too long, when the jig moves in the circumferential direction in the groove, the jig contacts the ceiling surface in the groove and the jig moves smoothly. It becomes difficult.

The thickness of the guide portion 54 is preferably about half of the thickness of the push-up portion 53. Since the guide part 54 serves as a guide for inserting the first jig into the gap between the ceiling surface 34 of the groove part and the seal plate 21, a certain degree of rigidity is required. If the thickness of the guide portion 64 is too thin, the rigidity becomes insufficient, the insertion is difficult because it is too soft, and the original role cannot be fulfilled. On the other hand, if the plate thickness is too thick, interference with the ceiling surface or the like in the groove portion occurs, making it difficult to smoothly move the jig in the circumferential direction.

  The jig body 51 preferably has a certain degree of rigidity (hardness) as a whole jig including the guide portion 54. It is necessary to move the seal plate to the inside in the radial direction by pushing the seal plate in the shape of the jig main body with a portion having an extremely thick radial direction. If the rigidity of the jig main body is insufficient, the seal plate Smooth movement becomes difficult.

Further, a handle 52 separate from the jig main body 51 is engaged with the jig main body 51 via the mounting portion 55. The handle portion 52 is the longest member of the first jig 50 and is formed of a two-ply thin plate product. One end of the handle 52 is engaged with the jig main body 51 by appropriate engaging means such as a thin wire, and the other end is also bound by the same engaging means. Instead of bundling means using a wire rod, through holes may be formed in the handle portion 52 and the attachment portion 55 and fixed with rivets. Since the handle portion 52 is formed of a two-layered thin plate, the flexibility is greater than the case of a single plate having the same thickness as the two-layered thickness, and the jig is inserted. Sometimes easy to handle. Even though the handle 52 is long, it is desirable that the handle 52 has characteristics with rigidity and flexibility.

FIG. 8B shows an external appearance when the first jig 50 disposed in the groove is viewed from the radial direction toward the center of the rotating shaft. The width (axial thickness) of the push-up portion 53 of the first jig 50 is desirably at least smaller than the groove width at the open end. This is because it is necessary to make the width of the push-up portion 53 smaller than the groove width of the opening end 33 in order to move the seal plate to the vicinity of the opening end having the smallest groove width in the groove portion. Since the first jig 50 is light in weight as a whole and has lubricity and flexibility, it is easy to insert the jig.

Fig.9 (a) and FIG.9 (b) show the modification of a 1st jig | tool. This modification differs from the first jig 50 shown in Fig. 8 in that the guide part is removed. Since there is no guide part, the jig body 51 becomes compact and the handling of the jig becomes easier. However, when the push-up portion 53 of the first jig 50 of the present modification is inserted into the groove portion 31, the tip portion of the push-up portion 53 is manually inserted into the gap between the ceiling surface 34 of the groove portion 31 and the seal plate 21. It is necessary to manually open a large insertion slot that can be pushed in. Also. Since there is no guide part serving as a guide, when the first jig 50 moves in the circumferential direction in the groove part, the movement of the jig lacks smoothness, and the pushing operation from the handle part 52 side becomes slightly difficult. .

  FIG. 10 shows the relative relationship between the radial thickness of the first jig, the thickness of the seal plate, and the groove depth in the groove section. The first jig 50 is inserted into the gap between the seal plate 21 and the ceiling surface 34 of the groove portion 31 from the guide portion 54 side, and the first jig 50 moves in the groove portion 31 in the circumferential direction. 21 moves radially inward along the side surface 35 in the groove 31. While the seal plate 21 moves in the radial direction in the groove portion 31, the end surface 21 d of the seal plate 21 starts to contact the side surface 35 of the groove portion 31. It is desirable to move the seal plate 21 to a predetermined position while moving the first jig 50 until at least the end surfaces 21d on both sides of the seal plate 21 come into contact with the side surfaces 35 on both sides of the groove portion 31. If the end surfaces 21d on both sides of the seal plate 21 do not contact the side surface 35 and there is a gap between at least one side surface, even if pressurized fluid is supplied to the groove portion, the space of the groove portion is not pressurized, This is because the groove cannot be sealed.

  FIG. 10 shows a state in which the seal plate 21 has moved and both ends of the inner surface 21b of the seal plate 21 are in contact with the entrance of the opening end 33 of the groove portion 31 (the radially outer end 38a of the opening end straight portion 38). ing. The position of the seal plate indicates the allowable upper limit position of the seal plate 21 that moves using the first jig 50. If the seal plate 21 is moved in the radial direction to this position, even if the pressurized fluid is supplied to the groove portion 31 via the supply path 16, leakage occurs between the end surface 21d of the seal plate 21 and the side surface 35 of the groove portion 31. It does not occur and the space between the groove 31 and the atmosphere side is sealed. If the sealability of the space of the groove portion can be maintained, the seal plate 21 is pressed against the outer surface of the rotary shaft 6 until the outer surface 21a of the seal plate 21 is pressed by the pressure of the pressurized fluid PG and comes into contact with the outer surface of the rotary shaft 6. Move radially inward along the wall.

  The radial height h3 of the extremely thick portion of the push-up portion 53 of the first jig 50 is desirably selected so that the seal plate 21 has the above-described maximum seal depth. That is, in FIG. 10, the jig height h3 is a value determined by subtracting at least the opening end straight portion length h2 and the seal plate thickness t1 from the groove depth h1 (this value is referred to as “the seal upper limit depth”). It is desirable to have a height corresponding to. That is, it is desirable that the thickness of the push-up portion 53 is at least larger than the height corresponding to the seal upper limit depth. This is because when the height of the push-up portion 53 is small, the space of the groove portion 31 is not sealed, and it becomes difficult to arrange the seal plate while maintaining an appropriate position and posture. Even when the third jig 70 is used, since the plate thickness of the third jig is usually smaller than the thickness of the jig, when determining the above-mentioned seal upper limit position depth, The thickness of the three jigs need not be considered.

  In addition, when the cross-sectional shape of the groove portion is formed by only the intermediate inclined portion from the ceiling surface to the end of the opening end and does not include the opening end straight portion, the above-mentioned seal upper limit depth is the opening end straight portion. It may be determined that there is no h2 (h2 = “0”).

Next, the second jig (adjustment jig) will be described below.
The second jig is a jig used to dispose the seal plate 21 on the outer surface of the upper half of the rotary shaft 6 after disposing the seal plate in the lower half housing 13 formed as a single unit. is there. That is, the second jig is used when the seal plate 21 is disposed in the half cracked groove portion 31 formed in the base portion 22 constituting the housing body 20 with the side plate 23 of the upper half housing 12 removed. Use. By adjusting the amount of clearance between the seal plate and the surface of the rotary shaft using the second jig, it is possible to dispose the seal plate without causing bending, and the appropriate length of the seal plate Can be selected.

As shown in FIG. 11, the second jig 60 is a fan-shaped thin plate-like jig formed of a single plate, and it is desirable to apply a lubricating material such as Teflon (registered trademark). The second jig 60 forms an outer edge 63 that forms the outer periphery of the jig, an intermediate edge 64 that is located between the outer edge 63 and the inner edge 66 that forms the inner periphery of the jig, and a fan-shaped radius 2. It is formed by a flange 61 surrounded by two side edges 65 and an insertion part 62 extending in a plurality of strips from the intermediate edge 64 toward the inner edge 66 toward the sector center. That is, among the fan-shaped shapes surrounded by the intermediate edge 64 and the inner edge 66, a rectangular or arc-shaped cutout portion 67 is cut off at every constant width, and a portion extending from the flange portion 61 toward the center of the fan-shaped portion is inserted. 62. The insertion portion 62 preferably has a shape bent inward along the intermediate edge 64 so as to be substantially perpendicular to the surface of the flange portion 61. The number of insertion portions 62 per second jig 60 varies depending on the circumferential length per jig. A plurality of insertion portions may be provided for one jig, or one may be provided.

The height of the flange portion 61 (the length along the side edge 65 between the outer edge 63 and the intermediate edge 64) is approximately the same as the groove depth h1 of the groove portion 31, and the length of the insertion portion 62 (to the side edge 65). The length between the intermediate edge 64 and the inner edge 66) is preferably within twice the plate width of the seal plate. Further, the thickness of the insertion portion 62 may be reduced from the intermediate edge 64 toward the inner edge 66 at the tip. By changing the thickness, it becomes easy to adjust the slackness of the seal plate.

Next, the third jig (band plate) will be described below.
The third jig is a band-shaped jig used after the seal plate is inserted into the wide portion in the groove of the lower half housing and before the first jig is inserted. The first jig is the seal plate. The jig is previously arranged in the circumferential direction along the ceiling surface of the groove portion so that the inside of the groove portion between the groove portion and the ceiling surface of the groove portion can be smoothly moved in the center direction of the rotation axis.

As shown in FIG. 12, the third jig 70 includes a single long thin plate body 71 and a fixed ring 72. The thin plate body 71 is preferably made of a lubricating material such as Teflon (registered trademark). One end of the third jig 70 is provided with a fixed ring 72 for fixing the third jig 70 to the base 22 side of the upper half housing 12. When the first jig 50 is inserted into the groove 31, the fixed ring 72 engages with the strip plate bolt 39 provided on the base 22 side, and the third jig 70 moves along with the movement of the first jig 50. This is to prevent it from moving around in the groove portion 31 in the circumferential direction. By arranging the third jig 70 in advance, when the first jig 50 moves in the circumferential direction in the groove portion, the first jig 50 moves while contacting the surface of the third jig 70 having good lubricity. The tool can move smoothly and there is no risk of damaging the ceiling and side surfaces of the groove.

Next, a method for attaching the shaft seal according to the present embodiment will be described with reference to FIG. FIG. 13 shows how to attach the seal plate 21 to the lower half housing 13. As described above, the shaft seal 10 in the present embodiment is formed by the upper half housing 12 in which the side plate 23 of the housing 11 can be attached to and detached from the base portion 22 and the lower half housing 13 formed by an integral housing. Has been.

First, with the side plate 23 of the upper half housing 12 removed, the seal plate 21 is attached in the groove 31 of the lower half housing 13 from the circumferential direction of the rotating shaft.
With the side plate 23 of the upper half housing 12 removed, the seal plate 21 is inserted from the circumferential direction into the wide portion 32 of the groove 31 of the lower half housing 13. The seal plate 21 is pushed in the circumferential direction while sliding in the groove portion 31 along the wide portion 32 near the ceiling surface 34 until the tip of the seal plate 21 protrudes from the opening of the groove portion 31 on the opposite side. The seal plate 21 is pushed in so that the protruding length of the seal plate protruding from the opening of the groove portion 31 of the lower half housing 13 exceeds the circumferential length of the quarter circle of the rotating shaft 6. The seal plate 21 is disposed in the lower half housing 13 so that the seal plate 21 protrudes excessively from the openings on both sides of the groove 31 to the extent that the circumference of the quarter circle of the rotating shaft 6 is exceeded. .

Next, the 3rd jig | tool 70 shown in FIG. 12 is inserted in the circumferential direction in a groove part along the arrangement | positioning seal board 21. FIG. At that time, as shown in FIGS. 12 and 13, the belt bolt 39 for fixing the fixed ring 72 (first engaging means) attached to the third jig 70 to the base portion 22 of the upper half housing 12 is used. Engage with (second engaging means). Further, the third jig 70 is inserted into the gap between the seal plate 21 and the ceiling surface 34 of the groove 31 from the other end different from the one end provided with the fixed ring 72 of the third jig 70. The inside of the groove 31 is pushed in the circumferential direction while sliding until the end of the third jig 70 protrudes from the opening of the groove 31 on the opposite side.

After the third jig 70 is disposed, the first jig 50 is placed between the ceiling surface 34 and the disposed third jig 70 from the opening of the groove portion near the fixed ring 72 of the third jig 70. Insert into the gap (insertion position X in FIG. 13). When inserting the 1st jig | tool 50, it hold | maintains the handle part 52 and inserts it in the groove part 31 from the edge part of the guide part 54 of the other side. The first jig 50 is pushed in until the tip of the guide portion 54 protrudes from the opening of the groove portion 31 on the opposite side of the lower half housing 13. By this operation, it is desirable that the seal plate 21 disposed in the wide portion 32 of the groove portion 31 of the lower half housing 13 is moved inward in the radial direction and at least to the seal upper limit depth. If the seal plate can be disposed at this position, the seal plate can be disposed at a predetermined position during operation by supplying a pressurized fluid PG described later.

As described above, the so-called predetermined position of the seal plate 21 in the present embodiment is different between the position when the seal plate is attached and the operation of the turbine. That is, the shaft seal 10 uses the first jig 50 to dispose the seal plate 21 at a predetermined position in the groove, and then supplies the pressurized fluid PG so that the outer surface of the seal plate 21 is pressed by the pressurized fluid PG. 21a is pressed, the seal plate 21 slides radially inward along the side surface 35 of the opening end 33, and moves until the inner surface 21b of the seal plate 21 contacts the outer surface of the rotating portion 6. The position where the seal plate 21 contacts the surface of the rotary shaft 6 is a predetermined position when the seal plate 21 is in operation, and the original sealing performance of the shaft seal 21 is exhibited at this position. That is, the predetermined position when the seal plate 21 is attached means a position corresponding to a seal upper limit depth described later, and both ends of the inner surface 21b of the seal plate (the lower end of the end surface 21d of the seal plate 21) are open end straight portions. 38 is a position in contact with the radially outer end 38a. Further, the predetermined position during operation of the seal plate 21 is that the seal plate 21 is disposed at a predetermined position during mounting, and then the space of the groove portion is pressurized with the pressurized fluid PG so that the inner surface 21b of the seal plate 21 rotates. A position where the end surface 21 d of the seal plate 21 is in contact with the outer surface of the shaft 6 and is sandwiched between the side surfaces 35 of the open end 33 is referred to. At the position where the seal plate 21 is disposed at a predetermined position during operation, the space of the groove portion 31 is isolated from the outside to maintain a pressurized state, and the original sealing performance of the shaft seal is exhibited. .

9A and 9B, when the first jig 50 is inserted into the groove 31, the handle portion 52 is held with the push-up portion 53 as a head. Although the method of pushing in is explained, the handle 52 is used as a guide, the tip of the handle 52 is pushed into the groove 31 with the head as the head, and the handle 52 is protruded from the groove 31 on the opposite side. A method may be used in which the tip of the portion 52 is gripped and pulled, and the entire first jig is pulled out via the groove portion 31.

After confirming that the seal plate 21 is disposed, the first jig 50 is pulled out from the groove 31 in the same direction as the direction in which the seal plate 21 is inserted. Further, the fixed ring 72 (second engagement means) of the third jig 70 is detached from the strip plate bolt 39, and the third jig 70 is pulled out in the same direction as the direction in which the first jig 50 is pulled out. By this operation, at least the seal plate 21 is disposed at a position corresponding to the seal upper limit depth, and both ends of the inner surface 21b of the seal plate 21 are in contact with the radially outer ends 38a of the open end straight portions on both sides of the groove portion 31. Or arranged in a state of being gripped by the open end straight portions 38 on both sides.

After the seal plate 21 is disposed on the lower half housing 13, the surplus seal plate 21 protruding outside from both sides of the opening of the groove portion 31 of the lower half housing 13 is placed on the surface of the upper half portion of the rotary shaft 6. Along the circumferential direction. When arranging along the outer surface of the rotating shaft 6 in the circumferential direction, attention should be paid so that the sealing plate 21 is not loosened or bent. After confirming the length that the seal plate 21 can make one turn around the rotary shaft, the seal plate 21 is cut to a length that is slightly longer than the peripheral length of the rotary shaft 6. By fixing the cut surfaces at both ends of the seal plate with an adhesive, a single seamless annular seal plate 21 is disposed around the rotation axis.

Next, a method of adjusting the slack or deflection of the seal plate using the second jig 60 when the seal plate 21 is disposed on the outer surface of the upper half of the rotating shaft 6 will be described below. Since the seal plate expands and contracts depending on the environmental temperature during operation, it is necessary to adjust the length of the seal plate every time the seal plate is replaced. In addition, it is important for adjusting the slackness and deflection to dispose a seal plate having an appropriate length around the rotation axis in order to dispose the seal plate at a predetermined position. That is, if the seal plate is slack and the overall length of the seal plate is too long, when the seal plate 21 is disposed in the upper half housing 12, a part of the seal plate protrudes from the groove, and the seal plate 21 is forced into the groove. It will be pushed into. As a result, it is difficult to uniformly arrange the seal plate 21 along the outer surface of the rotating shaft, and the seal plate can be disposed at a predetermined position because the seal plate is locally twisted or distorted. Therefore, it becomes difficult to maintain the sealing performance of the entire shaft seal.

As shown in FIG. 14, a turbine body (vehicle) is arranged in the axial direction of the rotating shaft in the gap between the seal plate 21 disposed along the circumferential direction of the outer surface of the rotating shaft 6 and the outer surface of the rotating shaft 6. The insertion part 62 of the second jig 60 is inserted toward the ground part 7) of the chamber 2. In this case, the insertion portion 62 is moved from the axial direction of the rotation shaft so that the flange portion 61 of the second jig 60 is disposed on the outer side in the axial direction of the rotation shaft (the bearing box 9 side opposite to the ground portion 7). Insert into the gap. Thereafter, the insertion position of the insertion portion 62 in the axial direction is adjusted so that the seal plate 21 slightly floats from the outer surface of the rotating shaft 6. After the second jig 60 is arranged in the circumferential direction of the upper half of the rotating shaft 6 and the amount of lifting of the seal plate 21 is adjusted, the flange 61 between the adjacent second jigs 60 is fixed with the temporary fixing material 68. Fix it. As the temporary fixing material 68, a known tape or the like can be used. Further, if the thickness of the insertion portion 62 is reduced from the intermediate edge 64 side toward the inner edge 66 side, the difference between the seal plate 21 of the insertion portion 62 of the second jig 60 and the gap between the outer surfaces of the rotary shaft 6 is increased. By adjusting the insertion length, it becomes easy to adjust the amount of slack of the seal plate and the amount of slack.

Next, the side plate 23 on the upper half housing 12 side is attached to the base portion 22 so that the flange portion 61 is disposed outside the housing 11 with the second jig 60 disposed in the groove portion. After the side plate 23 is attached, the sealing plate 21 is disposed at a predetermined position in the groove portion 31 of the housing 11 by holding the flange portion 61 and pulling the second jig 60 outward in the radial direction. This completes the mounting of the shaft seal 10.

The second jig 60 is more effective when the work space in the upper half of the rotary shaft is narrow and it is difficult to attach and detach the seal plate from the axial direction. If the work space in the upper half of the rotary shaft 6 is sufficient and the sealing plate can be easily attached and detached from the axial direction, the rectangular thin plate can be attached and detached from the axial direction instead of the second jig. The length of the seal plate may be adjusted.

Next, after the shaft seal 10 is attached, the pressurized fluid PG is supplied into the groove 31 to pressurize the groove 31. That is, a separately prepared pressure source (not shown) and the connection port 15 of the housing 11 are connected to receive the pressurized fluid PG from the pressure source. The pressurized fluid PG may be nitrogen or an inert gas source in addition to air. The pressurized fluid PG is supplied, the space of the groove 31 is pressurized and held, and the presence or absence of the pressurized fluid is confirmed. When the confirmation of the presence or absence of leakage is finished, the seal plate 21 may be disposed at a predetermined position during operation, and it may be determined that the installation work of the shaft seal 10 has been completed.

If the shaft seal 10 of this embodiment is applied, the seal plate and the pressurized fluid supply path are separated during the flushing operation in the cleanup operation of the turbine. The seal plate and the supply path are not damaged. Further, even when the seal plate is worn, it can be easily replaced.

In addition, when the bearings are close to each other, the work space around the shaft seal is narrow, so even if it is difficult to attach and detach the shaft seal in the axial direction, the shaft seal and the shaft seal mounting method according to the present invention are used. If used, the shaft seal can be easily attached and detached.

6 Rotating shaft 7 Ground portion 10, 80 Shaft seal 11, 81 Housing 12 Upper half housing 13 Lower half housing 21 Seal plate 22 Base portion 23 Side plate 31, 82 Groove portion 32 Wide portion 34 Ceiling surface 35 Side surface 39 Bolt for strip ( Second engaging means)
50 First jig 51 Jig body 52 Handle part 53 Push-up part 54 Guide part 55 Attaching part 60 Second jig 61 Gutter part 62 Insertion part 63 Outer edge 64 Intermediate edge 65 Side edge 66 Inner edge 70 Third jig 72 Fixed ring (first engaging means)
PG Pressurized fluid

Claims (10)

A turbine shaft seal provided in the ground portion of the turbine and arranged in a ring around the rotation shaft,
The shaft seal includes a housing in which a U-shaped seal plate is disposed in a groove portion that opens in the center direction of the rotating shaft. The housing is formed of a side plate and a base, and the side plate is detachable in the axial direction. The upper half housing and the integrally formed lower half housing,
A method of assembling a turbine shaft seal that receives pressurized fluid from the outside into the housing and seals the rotating shaft,
Insert the seal plate into the groove of the lower half housing from the circumferential direction of the rotation shaft,
In the gap between the seal plate and the ceiling surface of the groove portion, a first jig having a chevron shape protruding inward and outward in the radial direction in an axial cross-sectional view is inserted in the circumferential direction of the rotating shaft,
While moving the first jig in the circumferential direction, the seal plate is moved in the radial inner direction along the side surface of the groove,
A method of assembling a turbine shaft seal, wherein the pressurized fluid is received in the groove and the seal plate is pressed radially inward to bring the seal plate into contact with an outer surface of a rotating shaft.   Before inserting the first jig into the groove, the end of the third long jig is placed in the gap between the seal plate disposed in the groove and the ceiling surface. The turbine shaft seal assembling method according to claim 1, wherein the third jig is disposed over the entire length in the circumferential direction of the lower half housing.   After the first engagement means provided at one end of the third jig is connected to the second engagement means provided in the housing and the third jig is engaged with the upper half housing, The method for assembling the turbine shaft seal according to claim 2, wherein three jigs are inserted into the groove.   The method for assembling a turbine shaft seal according to any one of claims 1 to 3, wherein the seal plate is inserted into a wide portion of a ceiling surface of the groove portion. After disposing the seal plate in the lower half housing,
On the outer surface of the rotating shaft of the upper half housing, an excess sealing plate is disposed along the circumferential direction of the rotating shaft so as to go around the rotating shaft.
The sealing plate is formed into an annular sealing plate by joining both end faces of the sealing plate,
Folding the flange part of the second jig provided with the thin-plate fan-shaped flange part and the strip-shaped insertion part along the intermediate edge, the flange part is in front of the axial direction of the rotating shaft with respect to the ground part of the turbine. Arranged to come to,
The insertion part of the second jig is inserted from the gap between the seal plate and the outer surface of the rotary shaft toward the ground part in the axial direction of the rotary shaft,
The side plate is attached to the base portion from the axial direction so that the flange portion is disposed outside the axial direction of the upper half housing,
The method of assembling a turbine shaft seal according to claim 1, wherein the second jig is pulled out in a radial direction from the upper half housing while holding the flange. It is the 1st jig | tool used for the assembly | attaching method of the shaft seal for turbines of any one of Claims 1-5,
A push-up portion having a chevron shape protruding inward and outward in the radial direction in an axial cross-sectional view;
An attachment portion extending in the longitudinal direction from the center of the radial height of the upper portion;
A jig body formed from
An elongated handle portion extending in the longitudinal direction adjacent to the jig main body, and having one end detachably engaged with the jig main body via the attachment portion;
The 1st jig | tool used for the assembly | attaching method of the shaft seal for turbines formed from this.   The turbine shaft seal according to claim 6, wherein the push-up portion is provided integrally with the push-up portion on the opposite side of the attachment portion in the longitudinal direction and includes a long guide portion extending in the longitudinal direction. The first jig used in the assembly method.   The first jig used in the turbine shaft seal assembling method according to claim 6 or 7, wherein the push-up portion has a radial height corresponding to at least a seal upper limit position depth.   The said handle | steering-piece part is a 1st jig | tool used for the assembly | attaching method of the shaft seal for turbines of any one of Claim 6 to 8 formed from an elongate thin plate of at least 2 sheets piled up. A second jig used in the method for assembling the turbine shaft seal according to claim 5,
An arc-shaped outer edge that forms an outer circumference circle, an arc-shaped intermediate edge that forms an inner circumference, and a fan-shaped collar that is surrounded by two side edges that form a radius;
Extending from the flange toward the inner edge toward the center in the radial direction, formed from a thin strip-shaped insertion portion having a plate width shorter than the arc length of the intermediate edge,
A second jig used in a method of assembling a turbine shaft seal, wherein the flange portion and the insertion portion can be folded back with respect to the intermediate edge.

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