JP2007002725A - Winding bush for repair and support bearing device for gas turbine variable stator blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily repair the periphery of a bearing when the bearing is worn. <P>SOLUTION: When an inner peripheral face 36 of the bearing 35 rotatably supporting a rotating shaft 21 is worn, a winding bush 1 for repair is wound around and mounted on the rotating shaft 21. The outer diameter of the winding bush 1 for repair is set smaller than the diameter of the worn inner peripheral face 36 of the bearing 35, and the outer peripheral face 5 of the winding bush 1 for repair is formed so as to contact with the inner peripheral face 36 of the bearing 35. Since the bearing 35 is fitted to a bearing fitting hole 32 that is a portion to hold the bearing 35, the rotating shaft 21 can be easily rotatably supported by the bearing 35 via the winding bush 1 for repair by winding the winding bush 1 for repair around the rotating shaft 21, even when replacement is difficult. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be easily repaired. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a support winding device for a repair winding bush and a variable stationary blade for a gas turbine. In particular, the present invention relates to a repair winding bush and a support bearing device for a variable stationary blade for a gas turbine that can easily repair a bearing portion.

  A conventional support bearing device for a variable stationary blade for a gas turbine has a rotating shaft that can rotate the variable stationary blade by operating a drive lever, and a bearing that supports the rotating shaft is further provided. It has been. For example, in patent document 1, as a bearing which supports a rotating shaft, two places in the axial direction of the rotating shaft are supported by two bearings. As a result, the rotating shaft can be supported at a position distant in the axial direction of the rotating shaft, so even when a load in a direction perpendicular to the axial direction of the rotating shaft acts on the variable stationary blade during the operation of the gas turbine, it is more reliable. The load can be received by two bearings.

JP-A-8-32373

  However, in the above-described support bearing device for a variable stationary blade for a gas turbine, if the bearing is worn and worn by the rotation of the rotating shaft, the bearing must be replaced. Since such a bearing is often fitted to a casing holding the bearing by cold fitting or the like, it is very difficult to replace the bearing. On the other hand, in equipment such as a gas turbine, the operation is periodically stopped, each part is inspected, and if necessary, the part is replaced, so-called periodic inspection is performed. This periodic inspection is carried out with preparations to replace the parts if necessary, so even if the replacement of the bearing is difficult as described above, the replacement can be performed, but the wear of the bearing can be detected. This is not always the case for periodic inspections. That is, the wear of the bearing may be found at a time between the periodic inspections. Even in such a case, it is necessary to replace the bearing. However, it is very difficult to replace the bearing because preparations for replacement are not made at a time other than the periodic inspection.

  The present invention has been made in view of the above, and provides a winding bush for repair and a support bearing device for a variable stationary blade for a gas turbine that can easily repair the periphery of the bearing when the bearing is worn. For the purpose.

  In order to solve the above-described problems and achieve the object, a winding bush for repair according to the present invention is wound around a portion of a shaft that is rotatably supported by a bearing so as to face the bearing. And the outer diameter in the state attached to the shaft is smaller than the inner diameter after wear of the inner peripheral surface of the bearing, and the outer peripheral surface is the inner peripheral surface. It is formed so that contact is possible.

  In this invention, the repair winding bush is formed so as to be attached by being wound around the shaft, and the outer diameter of the repair winding bush when attached to the shaft is larger than the inner diameter of the bearing after wear. It is getting smaller. Moreover, the outer peripheral surface of the winding bush for repair is formed so that contact with the inner peripheral surface of a bearing is possible. As a result, when the bearing is worn, the shaft can be rotatably supported by the bearing via the repair winding bush by attaching the repair winding bush to the shaft. As a result, when the bearing is worn, the periphery of the bearing can be easily repaired.

  In addition, the repair winding bush according to the present invention is formed from one end of the both ends in the axial direction of the shaft to the other end, and has a gap in the circumferential direction of the shaft. A notch is formed.

  In this invention, since the notch is formed in the repairing winding bush, when the repairing winding bush is mounted on the shaft, the notch gap is opened so that the repairing winding bush can be easily mounted on the shaft. It can be attached to the shaft. As a result, when the bearing is worn, the periphery of the bearing can be repaired more easily.

  Further, in the repair winding bush according to the present invention, the notch is formed so as to advance in the circumferential direction of the shaft from one end of the both ends toward the other end. It is characterized by being.

  In this invention, since the notch is formed as described above, even when the repair winding bush is attached to the shaft, the shaft is supported more securely even when the shaft is supported by the bearing through the repair winding bush. can do. In other words, since the notch is formed so as to advance in the circumferential direction of the shaft from one end of the repair winding bush to the other end, the repair winding bush is attached to the notch. There is no portion formed in the entire axial direction of the shaft. In other words, the outer peripheral surface of the winding bush for repair is formed in any part in the axial direction in any part in the circumferential direction of the shaft. For this reason, when the shaft is supported by the bearing via the repair winding bush, it is possible to prevent the shaft from being supported with a step at the notch, and the shaft can be more reliably supported by the bearing. . As a result, when the bearing is worn, the periphery of the bearing can be repaired more reliably.

  The repairing winding bush according to the present invention is fixed to the shaft by an adhesive when attached to the shaft.

  In this invention, since the repair winding bush is fixed to the shaft with an adhesive, the outer periphery of the repair winding bush is used when a pin is used or caulked when the repair winding bush is attached to the shaft. It can suppress that an unevenness | corrugation arises on a surface. As a result, when the shaft is supported by the bearing so as to be rotatable via the repair winding bush, it is possible to suppress the occurrence of unevenness in the contact portion between the outer peripheral surface of the repair winding bush and the inner peripheral surface of the bearing. The shaft can be more reliably supported by the bearing through the winding bush. As a result, when the bearing is worn, the periphery of the bearing can be repaired more reliably.

  In the wound bush for repair according to the present invention, a bearing-side lubricating film is formed on the inner peripheral surface of the bearing, and the outer peripheral surface is made of the same material as the material constituting the bearing-side lubricating film. A bush-side lubricating film is formed.

  In this invention, since the bush-side lubricating coating made of the same material as the bearing-side lubricating coating formed on the inner peripheral surface of the bearing is formed on the outer peripheral surface of the repairing winding bush, the shaft is inserted through the repairing winding bush. Can be supported more reliably when it is supported by a bearing so as to be rotatable. In other words, when the bearing-side lubrication film formed on the inner peripheral surface of the bearing is worn away, a repairing wound bush formed with a bush-side lubrication film made of the same material as the bearing-side lubrication film is attached to the shaft. A lubricating film can be interposed between the shaft on which the repairing bush is attached and the bearing. That is, the original state can be restored to the state before the bearing-side lubricating film is worn away. As a result, when the bearing is worn, the periphery of the bearing can be repaired more reliably.

  The gas turbine variable stator blade support bearing device according to the present invention has a rotating shaft serving as the shaft while rotating the variable stator blade, and the above-described repair winding bush is provided on the rotating shaft. It can be attached.

  In this invention, by attaching the above-described repair winding bush to the rotating shaft of the gas turbine variable stator blade support bearing device, the gas turbine having the gas turbine variable stator blade support bearing device other than the periodic inspection is provided. Even when bearing wear is discovered at a time, the rotating shaft can be rotatably supported by the bearing via the repair winding bush without replacing the bearing by attaching the repair winding bush to the rotating shaft. Can do. As a result, when the bearing is worn, the periphery of the bearing can be easily repaired.

  The winding bush for repair according to the present invention has an effect that the periphery of the bearing can be easily repaired when the bearing is worn. Moreover, the support bearing device for a variable stationary blade for a gas turbine according to the present invention has an effect that the periphery of the bearing can be easily repaired when the bearing is worn.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a support winding device for a repair winding bush and a gas turbine variable stationary blade according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic view of a main part of a support bearing device for a variable stationary blade for a gas turbine provided with a repair winding bush according to an embodiment of the present invention. A variable stationary blade 20 shown in the figure is a gas turbine variable stationary blade 20 provided in a gas turbine (not shown), and the variable stationary blade 20 is a gas flow path that is a flow path of gas flowing in the gas turbine. 50. The variable stationary blade 20 is formed in a substantially plate shape. In addition, the variable stator blade 20 is formed in a direction in which the axial direction is orthogonal to the direction in which the gas in the gas channel 50 flows in a state where the variable stator blade 20 is disposed in the gas channel 50. The rotating shaft 21 is connected via a seal part 41. The seal portion 41 is formed in a substantially cylindrical shape whose axial direction is the same as the axial direction of the rotary shaft 21, and one end of both end portions of the cylindrical axial direction is connected to the variable stationary blade 20. The other end is connected to the rotating shaft 21. Thereby, the rotating shaft 21, the seal | sticker part 41, and the variable stationary blade 20 are integrally formed.

  A part of the gas flow path 50 is formed in an inner portion of a casing 31 in which the variable stator blade 20 is disposed. The casing 31 is provided as a part of the support bearing device 30 of the variable stator blade 20. ing. Specifically, the casing 31 has a bearing fitting hole 32 that is a hole formed in a direction perpendicular to the axial direction with respect to the direction in which the gas in the gas flow path 50 flows, and the bearing fitting hole 32. A seal portion receiver 44, which is a cylindrical concave portion that is located on the gas flow path 50 side and is open to the gas flow path 50, is formed. Among these, in the bearing fitting hole 32, two bearings 35 are provided in the vicinity of both end portions in the axial direction. The rotary shaft 21 is provided as a shaft rotatably supported by the bearing 35. Specifically, the rotary shaft 21 is inserted through the bearing fitting hole 32 and is provided in the bearing fitting hole 32. The two bearings 35 are rotatably supported. In this state, the seal portion 41 is located in the seal portion receiver 44. Furthermore, a drive lever 40 is connected to the vicinity of the end on the opposite side of the end on the variable stationary blade 20 side, in the both ends of the rotating shaft 21 in the axial direction.

FIG. 2 is a detailed view of a part A in FIG. 1 and shows a state before the support bearing device is repaired. The two bearings 35 included in the support bearing device 30 of the gas turbine variable stator blade 20 are formed in a substantially cylindrical shape, and the cylindrical shape is formed at one end of both end portions in the axial direction of the bearing 35. A flange portion 38 formed with a diameter larger than the diameter of the outer peripheral surface 37 and projecting in a radial direction from the outer peripheral surface 37 is formed. In the two bearings 35, the flange portions 38 of the two bearings 35 are positioned in the direction of the variable stator blade 20 in the bearing fitting hole 32 in the direction in which both flange portions 38 are separated from each other. The bearing 35 is disposed in the bearing fitting hole 32 in a direction located on the blade 20 side, and the flange 35 of the bearing 35 located on the drive lever 40 (see FIG. 1) side in the bearing fitting hole 32 has a drive lever. It is disposed in the bearing fitting hole 32 in a direction located on the 40 side. The diameter of the outer peripheral surface 37 of the bearing 35 disposed in the bearing fitting hole 32 in this direction is substantially the same as the inner diameter of the bearing fitting hole 32. For this reason, the two bearings 35 are fitted in the bearing fitting holes 32. Further, on the inner peripheral surface 36 of the bearing 35, a solid lubricating dry film coated with one or several kinds of solid lubricants such as molybdenum disulfide (MoS ₂ ) and graphite is provided on the bearing side lubricating film (not shown). ). In addition, the thickness of the bearing-side lubricating film is preferably about 10 to 20 μm.

  When the bearing 35 is not worn, that is, when the support bearing device 30 is normal, the inner diameter of the bearing 35 that is the diameter of the inner peripheral surface 36 of the bearing 35 is slightly larger than the shaft diameter of the rotary shaft 21. Has been. Thus, the rotary shaft 21 is inserted into the bearing 35 and is rotatably supported by the bearing 35 while being in contact with the inner peripheral surface 36 of the bearing 35. The seal portion 41 is formed in a substantially cylindrical shape having a diameter larger than the shaft diameter of the rotary shaft 21, and an O-ring groove 42 is formed on the outer peripheral surface thereof. The seal portion receiver 44 into which the seal portion 41 enters is located on the gas flow path 50 side of the bearing fitting hole 32, has a diameter larger than the diameter of the bearing fitting hole 32, and has a shape of the seal portion 41. It is formed in a substantially cylindrical shape whose diameter is slightly larger than the outer diameter of a certain cylindrical shape. The seal portion 41 is located in the seal portion receiver 44 with the O-ring 43 inserted in the O-ring groove 42. For this reason, the O-ring 43 in the O-ring groove 42 is in contact with the inner wall of the seal portion receiver 44.

  FIG. 3 is a detailed view of a portion A in FIG. 1 and shows a state after the support bearing device is repaired. When the inner peripheral surface 36 of the bearing 35 included in the support bearing device 30 is worn by operating the gas turbine, the inner diameter of the bearing 35 is increased. In this case, the repair winding bush 1 is wound around the rotating shaft 21. The repair winding bush 1 is wound around two places of the rotating shaft 21, and the position thereof is provided with a bearing 35 in the axial direction of the rotating shaft 21 inserted in the bearing fitting hole 32. It is a position. Further, the width of the rotating shaft 21 in the axial direction is substantially the same as the width of the bearing 35 in the axial direction of the rotating shaft 21. Further, in the state where the repair winding bush 1 is wound around the rotary shaft 21, the outer diameter of the repair winding bush 1 is slightly smaller than the inner diameter of the bearing 35 after the inner peripheral surface 36 is worn. It has become. For this reason, the inner peripheral surface 36 of the bearing 35 is worn, and the rotary shaft 21 around which the repair winding bush 1 is wound is supported so as to be rotatable while the repair winding bush 1 is in contact with the inner peripheral surface 36 of the bearing 35. ing.

  FIG. 4 is a diagram showing the material shape of the winding bush for repair shown in FIG. FIG. 5 is a perspective view of the winding bush for repair shown in FIG. The repair winding bush 1 is made of a substantially parallelogram-shaped plate material 10 having a thin plate thickness, and is formed by winding the plate material 10 into a cylindrical shape. Further, the material is a steel material such as SK4M (carbon tool steel), which is used after being tempered and subjected to a manganese phosphate film treatment as a base treatment. The plate thickness of the plate 10 is preferably about 0.1 mm, and the manganese phosphate coating treatment is preferably about 3 μm.

  When winding the parallelogram-shaped plate material 10 formed in this way, it is located in a portion facing each other and orthogonal to one set of two sets of two sets of two sets of parallel sides. Wound so that the direction to do is the axial direction. That is, it winds so that the direction orthogonal to the edge part edge 11 which is one set of the two sets of sides when two parallel sides are taken as one set is the axial direction. When the parallelogram plate material 10 having a thin plate thickness is wound into a cylindrical shape in this direction, a pair of end sides 11 are located at both ends in the axial direction of the cylinder, and the end portions of the repair winding bush 1 8

  Further, in the state of the plate material 10, the hypotenuse 12, which is a set of sides formed at an angle other than 90 ° with respect to the end side 11, is wound in a cylindrical shape. In some cases, it is formed as a notch portion 7 that becomes a notch of the winding bush 1 for repair. That is, in the state of the plate material 10, the two oblique sides 12 are formed in parallel, and the plate material 10 is wound in a direction in which the direction orthogonal to the end side 11 is an axis, so that the plate material 10 has a cylindrical shape. Even when formed, the portions corresponding to the pair of hypotenuses 12 are parallel. Further, when the plate material 10 is wound as the repair winding bush 1, the two oblique sides 12 are positioned in the vicinity of each other while being separated in the circumferential direction of the cylindrical shape. For this reason, the repairing winding bush 1 has two portions corresponding to the hypotenuse 12 spaced apart and has a gap in this portion. That is, the notch 7 is formed with a gap formed from one end 8 to the other end 8 of both ends in the axial direction of the repair winding bush 1.

  Further, the cutout portion 7 has a hypotenuse 12 in the state of the plate material 10 before the formation of the repair winding bush 1, but the hypotenuse 12 is formed at an angle other than 90 ° with respect to the end side 11. Therefore, when the plate member 10 is formed in a cylindrical shape with the end portion side 11 serving as the end portion 8, the cutout portion 7 formed by the hypotenuse 12 is inclined with respect to the cylindrical axial direction. ing. That is, the cutout portion 7 is formed so as to advance in the circumferential direction when the axial direction of the rotary shaft 21 is used as the axis from the one end portion 8 of the both end portions 8 toward the other end portion 8. Has been. The notch 7 is formed in such a shape and has a gap in the circumferential direction.

  Further, after the repair winding bush 1 is formed in such a shape, it is made of a solid lubricating dry film made of the same material as the material constituting the bearing-side lubricating film formed on the inner peripheral surface 36 of the bearing 35 on the outer peripheral surface 5. A bush side lubricating film (not shown) is formed. That is, the repairing wound bush 1 coats the outer peripheral surface 5 with a bush side lubricating film made of the same material as the bearing side lubricating film.

  Further, the repair winding bush 1 is made of the steel material as described above, and is formed in a substantially cylindrical shape having the notch portion 7 by the thin plate material 10, and thus has elasticity. . Further, in the state of the single body of the repair winding bush 1, the diameter of the inner peripheral surface 6, that is, the inner diameter of the repair winding bush 1 is the same as the shaft diameter of the rotating shaft 21 or from the shaft diameter of the rotating shaft 21. Has a slightly smaller diameter.

  The repair winding bush 1 and the support bearing device 30 for the gas turbine variable stationary blade 20 according to this embodiment are configured as described above, and the operation thereof will be described below. During operation of the gas turbine provided with the support bearing device 30, gas flowing in the gas turbine flows in the gas flow path 50 during operation of the gas turbine. A seal portion 41 is provided between the gas flow path 50 and the rotary shaft 21, and the seal portion 41 is located in the seal portion receiver 44. Further, since the O-ring groove 42 is formed in the seal portion 41 and the O-ring 43 is disposed in the O-ring groove 42, the O-ring 43 and the seal portion receiver 44 are connected to each other. By contacting, the gas flowing in the gas flow path 50 is blocked by the O-ring 43 and the seal portion receiver 44, and the inflow and outflow from the bearing fitting hole 32 is suppressed.

  When the gas turbine is operated, the variable stationary blade 20 may be operated to adjust the output of the gas turbine, but when the variable stationary blade 20 is operated, the drive lever 40 is moved to rotate the rotating shaft 21. Due to this rotation, the variable stator blade 20 formed integrally with the rotary shaft 21 rotates in the same direction as the rotation direction of the rotary shaft 21. Thereby, the flow of the gas flowing in the gas flow path 50 is changed by the rotation of the variable stationary blade 20, and the output of the gas turbine is changed.

  When the bearing 35 is not worn, the rotating shaft 21 contacts the inner peripheral surface 36 of the bearing 35 and is supported by the bearing 35. Further, since the bearing 35 is fitted in the bearing fitting hole 32, it is provided as a stationary part. Therefore, when the rotating shaft 21 rotates, only the rotating shaft 21 rotates in the bearing fitting hole 32, and the rotating shaft 21 and the inner peripheral surface 36 of the bearing 35 slide. Since the bearing-side lubricating film is formed on the inner peripheral surface 36 of the bearing 35, the rotary shaft 21 is easily slidable with respect to the inner peripheral surface 36 of the bearing 35. Since the hardness is lower than that of the bearing 21, the bearing-side lubricating coating is easily worn by the sliding of the rotating shaft 21 with respect to the inner peripheral surface 36 of the bearing 35. For this reason, when the variable stator blade 20 is operated and the rotating shaft 21 repeats sliding with respect to the inner peripheral surface 36 of the bearing 35, the bearing-side lubricating film wears, and the inner peripheral surface 36 of the bearing 35 wears. When the inner peripheral surface 36 of the bearing 35 is worn, the inner diameter of the bearing 35 is increased, so that the difference between the inner diameter of the bearing 35 and the outer diameter of the rotary shaft 21 is increased. As a result, the gap between the bearing 35 and the rotary shaft 21 is increased, so that the backlash between the rotary shaft 21 and the bearing 35 is increased, and it is difficult to support the rotary shaft 21 with the bearing 35.

  FIG. 6 is a perspective view of the variable stationary blade and the wound winding bush for repair. When the inner peripheral surface 36 of the bearing 35 is worn and the backlash between the rotary shaft 21 and the bearing 35 becomes large, the support bearing device 30 is repaired, but the bearing 35 is fitted in the bearing fitting hole 32. Therefore, replacement of the bearing 35 is difficult. For this reason, the wear of the inner peripheral surface 36 of the bearing 35 is found in a case other than during work that requires repair or replacement of each part of the part, such as during periodic inspection of the gas turbine. When the play is large, the repair winding bush 1 is wound around the rotating shaft 21.

  When the winding bush 1 for repair is wound around the rotating shaft 21, the winding bush 1 is wound around the repairing range 22 that is a portion of the rotating shaft 21 that contacts the bearing 35 or a portion of the surface of the rotating shaft 21 that faces the bearing 35. Since two bearings 35 are fitted in the bearing fitting holes 32, the repair range 22 is also two places. Further, in the repair winding bush 1, the width of the cylindrical shape of the repair winding bush 1 in the axial direction is substantially the same as the width of the bearing 35 in the same direction. Therefore, the width of the repair winding bush 1 in the axial direction of the rotary shaft 21 and the width of the repair range 22 in the same direction are substantially the same width.

  In the case where the repair winding bush 1 is wound around the rotating shaft 21, an adhesive (not shown) is applied to the inner peripheral surface 6 of the repair winding bush 1 or the repair range 22 of the rotating shaft 21. Thereafter, the winding bush 1 for repair is wound around the rotary shaft 21, and the winding bush 1 for repair has elasticity. For this reason, when winding the winding bush 1 for repair around the rotating shaft 21, the notched portion 7 is opened, and the repairing winding bush 1 is deformed so that the gap between the notched portions 7 becomes large. Wrap. The inner diameter of the repair-wound bush 1 as a single unit is the same as or slightly smaller than the shaft diameter of the rotary shaft 21, so that the repair-wound bush 1 is opened so that the gap between the notches 7 is opened. By deforming, the space inside the winding bush 1 for repair becomes large, and it becomes easy to wind around the rotating shaft 21. For this reason, when winding the repairing winding bush 1 around the rotating shaft 21, the winding shaft 1 is deformed as described above and wound so that the rotating shaft 21 passes inside the repairing winding bush 1.

  FIG. 7 is a view showing a state where the repair winding bush is attached to the rotating shaft. In order to deform the wound winding bush 1 for repair after passing the rotary shaft 21 inside the wound winding bush 1 for repair in a state where the wound bush 1 for repair is deformed so that the notch 7 is opened. When the force applied to is removed, the repair winding bush 1 tries to return to its original shape. That is, the notch 7 has a small gap. Since the inner diameter of the repairing winding bush 1 as a single unit is the same as or slightly smaller than the shaft diameter of the rotating shaft 21, in order to deform the repairing winding bush 1 when it is wound around the rotating shaft 21. By removing the applied force, the inner peripheral surface 6 (see FIG. 6) of the repair winding bush 1 is in close contact with the rotating shaft 21. Further, since an adhesive is applied to the inner peripheral surface 6 of the repairing winding bush 1 or the rotating shaft 21, the inner peripheral surface 6 of the repairing winding bush 1 is in close contact with the rotating shaft 21, thereby repairing. The winding bush 1 is fixed to the rotary shaft 21 with an adhesive. Thereby, the winding bush 1 for repair is attached to the rotating shaft 21. Further, in the state where the repairing winding bush 1 is attached to the rotary shaft 21 as described above, the repairing winding bush 1 is formed of a thin plate material 10, so that the outer diameter of the repairing winding bush 1 is the inner diameter. The diameter of the peripheral surface 36 is slightly smaller than the inner diameter of the worn bearing 35.

  When the variable stator vane 20 formed integrally with the rotating shaft 21 to which the repair winding bush 1 is attached is incorporated into a gas turbine, the worn inner surface 36 of the bearing 35 is adjusted with sandpaper or the like, The rotary shaft 21 is assembled in the support bearing device 30 in a state where the repair winding bush 1 is attached to the rotary shaft 21. That is, the rotating shaft 21 is inserted through the bearing fitting hole 32 in which the bearing 35 is fitted with the repair winding bush 1 attached (see FIG. 3). The repair winding bush 1 has a position and width in the axial direction of the rotary shaft 21 that are substantially the same as the position and width of the bearing 35 in the same direction, and the outer diameter is a bearing in a state where the inner peripheral surface 36 is worn. The diameter is smaller than the inner diameter of 35. For this reason, when the rotating shaft 21 to which the repair winding bush 1 is attached is inserted into the bearing fitting hole 32, the repair winding bush 1 is positioned inside the bearing 35. Thereby, the rotating shaft 21 to which the repairing winding bush 1 is attached is rotatably supported while the outer peripheral surface 5 of the repairing winding bush 1 is in contact with the inner peripheral surface 36 of the bearing 35. That is, when the rotating shaft 21 is rotated in this state, the outer peripheral surface 5 of the repair winding bush 1 and the inner peripheral surface 36 of the bearing 35 are in contact with each other and slide while the rotating shaft 21 rotates. To do. At this time, a bush-side lubricating film made of a solid lubricating dry film made of the same material as the material constituting the bearing-side lubricating film formed on the inner peripheral surface 36 of the bearing 35 is formed on the outer peripheral surface 5 of the wound winding bush 1 for repair. Therefore, the resistance during sliding between the outer peripheral surface 5 of the winding bush 1 for repair and the inner peripheral surface 36 of the bearing 35 is small.

  The above-described support winding device 30 for the repair winding bush 1 and the gas turbine variable stationary blade 20 can be attached to the rotation shaft 21 by winding the repair winding bush 1 around the rotation shaft 21. In addition, the outer diameter of the repair winding bush 1 in a state of being attached to the rotary shaft 21 is smaller than the inner diameter of the bearing 35 after wear. Further, the outer peripheral surface 5 of the repair winding bush 1 is inserted into the inner periphery of the bearing 35 by inserting the rotating shaft 21 to which the repair winding bush 1 is attached into the bearing fitting hole 32 into which the bearing 35 is fitted. The surface 36 can be contacted. As a result, when the rotating shaft 21 that contacts the inner peripheral surface 36 of the bearing 35 repeats rotation, the inner peripheral surface 36 of the bearing 35 wears and looseness occurs between the bearing 35 and the rotating shaft 21. By attaching the repair winding bush 1 to the rotating shaft 21, the rotating shaft 21 can be rotatably supported by the bearing 35 via the repair winding bush 1. In other words, the wear of the bearing 35 is compensated by attaching the repair winding bush 1 to the rotating shaft 21, and the gap between the inner peripheral surface 36 of the bearing 35 and the rotating shaft 21 caused by the wear of the bearing 35 is compensated. The rotary shaft 21 can be supported by the bearing 35 so as to be rotatable by being filled with the repair winding bush 1. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be easily repaired.

  The repair winding bush 1 has elasticity, and the repair winding bush 1 is formed with a notch 7. Therefore, when the repair winding bush 1 is attached to the rotary shaft 21, the gap of the notch 7 can be opened and attached to the rotary shaft 21. When the repairing winding bush 1 is a single body, the inner diameter is the same as or slightly smaller than the shaft diameter of the rotating shaft 21, but when the repairing winding bush 1 is attached to the rotating shaft 21, the gap between the notches 7 is formed. By opening and attaching, the space inside the repair winding bush 1 is widened, so that the repair winding bush 1 can be easily attached to the rotating shaft 21. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be repaired more easily.

  Further, the cutout portion 7 is formed so as to advance in the circumferential direction from the one end portion 8 of the repair winding bush 1 toward the other end portion 8. Even when the rotary shaft 21 is supported by the bearing 35 via the repair winding bush 1, it can be supported more reliably. That is, the cutout portion 7 is formed to advance in the circumferential direction from the one end portion 8 of the repair winding bush 1 toward the other end portion 8. There is no portion formed in the entire axial direction of the rotating shaft 21 to which the bush 1 is attached. In other words, on the outer peripheral surface 5 of the winding bush 1 for repair, a portion that can contact the inner peripheral surface 36 of the bearing 35 is formed in any portion in the axial direction in any portion in the circumferential direction of the rotating shaft 21. Has been. For this reason, since any part in the circumferential direction of the winding bush 1 for repair has a portion supported by the bearing 35, the rotary shaft 21 is supported by the bearing 35 via the winding bush 1 for repair. In this case, it is possible to suppress the stepped portion 7 from being supported with a step. Thereby, the rotating shaft 21 can be more reliably supported by the bearing 35. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be repaired more reliably.

  Further, since the repair winding bush 1 is fixed to the rotating shaft 21 with an adhesive, the unevenness of the portion that contacts the inner peripheral surface 36 of the bearing 35 can be reduced. That is, when the repair winding bush 1 is attached to the rotary shaft 21, the repair winding bush 1 is fixed using a fixing pin (not shown) or the repair winding bush 1 is fixed by caulking. It can suppress that an unevenness | corrugation arises in the outer peripheral surface 5 of 1. Thus, when the repair winding bush 1 is attached to the rotating shaft 21 and the rotating shaft 21 is supported by the bearing 35 so as to be rotatable via the repair winding bush 1, the repair winding bush 1 serving as both contact portions is provided. It can suppress that an unevenness | corrugation arises between the outer peripheral surface 5 of this and the inner peripheral surface 36 of the bearing 35. FIG. Therefore, the rotating shaft 21 can be more reliably supported by the bearing 35 through the repair winding bush 1. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be repaired more reliably.

  Further, since the repair winding bush 1 is fixed to the rotating shaft 21 with an adhesive, the repair winding bush 1 is detached from the rotating shaft 21 after the repair winding bush 1 is attached to the rotating shaft 21. In some cases, it can be easily removed by applying heat to the bonded portion. As a result, after the repair winding bush 1 is attached to the rotating shaft 21, the repair winding attached to the rotating shaft 21 is replaced even when the bearing 35 is to be replaced at another occasion such as during a periodic inspection of the gas turbine. Since the bush 1 can be easily removed, the rotary shaft 21 can be directly supported by the bearing 35 again. As a result, the periphery of the bearing 35 can be repaired more reliably.

  Further, a manganese phosphate film treatment is performed as a base treatment at the time of manufacturing the repairing wound bush 1. Thereby, even when the oxide film is formed in the surface of the board | plate material 10 which forms the winding roll 1 for repair, an oxide film can be removed. Furthermore, since the surface of the wound winding bush 1 for repair can be activated by performing the manganese phosphate film treatment, the adhesiveness due to the adhesive can be improved. Thereby, the winding bush 1 for repair can be more reliably fixed to the rotating shaft 21. As a result, the periphery of the bearing 35 can be repaired more reliably.

  Further, a bush-side lubricating film made of a solid lubricating dry film made of the same material as the material constituting the bearing-side lubricating film formed on the inner peripheral surface 36 of the bearing 35 is formed on the outer peripheral surface 5 of the winding bush 1 for repair. Therefore, when the rotating shaft 21 is rotatably supported by the bearing 35 through the repair winding bush 1, it can be supported more reliably. That is, when the bearing-side lubricating film formed on the inner peripheral surface 36 of the bearing 35 is worn due to repeated rotation of the rotating shaft 21, the bush made of a solid lubricating dry film made of the same material as the bearing-side lubricating film. By attaching the repairing winding bush 1 having the side lubricating film formed on the outer peripheral surface 5 to the rotating shaft 21, the lubricating film is interposed between the rotating shaft 21 to which the repairing winding bush 1 is attached and the bearing 35. be able to. That is, the original state can be substantially restored to the state before the bearing-side lubricating film is worn. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be repaired more reliably.

  Further, by attaching the above-described repair winding bush 1 to the rotating shaft 21 of the support bearing device 30 of the variable turbine vane 20 for gas turbine, the bearing 35 is provided at a time other than the periodic inspection of the gas turbine having the support bearing device 30. Even if wear is found, the periphery of the bearing 35 can be easily repaired. That is, even if the bearing 35 is worn by attaching the repair winding bush 1 to the rotating shaft 21 of the support bearing device 30 to operate the variable stator blade 20 and repeatedly rotating the rotating shaft 21, the bearing The rotating shaft 21 can be rotatably supported by the bearing 35 through the repair winding bush 1 without replacing the bearing 35 that is difficult to replace because it is fitted in the fitting hole 32. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be easily repaired.

  Further, since only the repair winding bush 1 is attached to the rotary shaft 21, the gas turbine is installed even if the support bearing device 30 is not carried to a maintenance shop or the like when the inner peripheral surface 36 of the bearing 35 is worn. The area around the bearing 35 can be repaired at the place. As a result, the periphery of the bearing 35 can be repaired more easily.

  The cutout portion 7 formed in the repair winding bush 1 is formed so as to advance in the circumferential direction from one end portion 8 of the repair winding bush 1 toward the other end portion 8. The cutout portion 7 may not be formed linearly in this direction. For example, the notch 7 may be formed in a zigzag shape so as to reciprocate in the circumferential direction from one end 8 of the repair winding bush 1 toward the other end 8. Even in the case where the notch 7 is formed in a zigzag shape, the outer peripheral surface 5 of the repairing winding bush 1 is not located in any part in the axial direction in any part in the circumferential direction of the rotating shaft 21. Since a portion that can contact the inner peripheral surface 36 is formed, when the rotary shaft 21 is supported by the bearing 35 via the repair winding bush 1, there is a step at the notch portion 7. It can suppress being supported. That is, if the cutout portion 7 is formed to advance in the circumferential direction from the one end portion 8 of the repair winding bush 1 toward the other end portion 8, the shape may be other than a linear shape. Good. By providing such a notch portion 7, the rotating shaft 21 can be more reliably supported by the bearing 35.

  Further, the notch 7 is formed so as to advance in the circumferential direction from one end 8 of the repair winding bush 1 toward the other end 8, but the rotation of the rotary shaft 21 is one. When not rotating, the notch 7 may be formed from one end 8 to the other end 8 along the axial direction. That is, when the rotating shaft 21 and the bearing 35 are in contact, generally, the surface of the rotating shaft 21 positioned in the direction in which a load acts on the rotating shaft 21 and the inner peripheral surface 36 of the bearing 35 are in contact. Therefore, when the rotation of the rotary shaft 21 does not rotate once, the portion of the surface of the rotary shaft 21 that contacts the inner peripheral surface 36 of the bearing 35 does not extend over the entire circumference of the surface of the rotary shaft 21. Only a predetermined range of directions. Therefore, even when the cutout portion 7 of the repair winding bush 1 is formed from one end portion 8 to the other end portion 8 along the axial direction, when the repair winding bush 1 is attached to the rotary shaft 21, By positioning the notch portion 7 at a position that does not contact the inner peripheral surface 36 of the bearing 35, it is possible to prevent the repair winding bush 1 and the inner peripheral surface 36 of the bearing 35 from contacting each other while having a step. it can. Thus, the notch 7 can be formed from one end 8 to the other end 8 along the axial direction, and by forming the notch 7 in this way, the notch 7 can be easily formed. Can be formed. As a result, the repair winding bush 1 can be manufactured more easily.

  Further, on the outer peripheral surface 5 of the wound winding bush 1 for repair, a bush-side lubricating film made of a solid lubricating dry film made of the same material as the material constituting the bearing-side lubricating film formed on the inner peripheral surface 36 of the bearing 35 is formed. However, the bush side lubricating film may be a solid lubricating dry film made of a material other than the same material as the material constituting the bearing side lubricating film. Even if the bush-side lubricant film is different from the material constituting the bearing-side lubricant film, if the same level of lubrication performance as the bearing-side lubricant film can be obtained, before the bearing-side lubricant film is worn in terms of performance, It can be restored to its original state. As a result, when the bearing 35 is worn, the periphery of the bearing 35 can be repaired more reliably.

  In the above description, the repair winding bush 1 is used for repairing the support bearing device 30 of the gas turbine variable stationary blade 20 and is connected to the variable stationary blade 20 to operate the variable stationary blade 20. Although attached to the rotating shaft 21, the repair winding bush 1 may be attached to a shaft other than the rotating shaft 21 included in the support bearing device 30 of the variable stationary blade 20 for gas turbine. If the rotating shaft is supported by a bearing and the bearing and the shaft may be worn by the rotation of the shaft, the repair winding bush 1 is the rotating shaft of the support bearing device 30 of the variable stationary blade 20 for the gas turbine. It may be attached to a shaft other than 21 and repaired when the bearing is worn.

  Further, the above-described repair winding bush 1 is attached to the rotary shaft 21 when the inner peripheral surface 36 of the bearing 35 is worn, so that the gap between the bearing 35 and the rotary shaft 21 which has become large due to wear is filled. Although it is used for repairing when it wears out, the winding bush 1 for repairing may be used in other cases. For example, when the rotating shaft 21 is formed of a light and soft material such as aluminum in order to reduce the weight, the repair winding bush 1 is attached to a position supported by the bearing 35 and is supported by the bearing 35 on the rotating shaft 21. It may be used for reinforcing the part.

  As described above, the support bearing device for the repair winding bush and the gas turbine variable stationary blade according to the present invention is useful when the rotating shaft is supported by the bearing. It is suitable when the replacement of the bearing is difficult.

It is a principal part schematic diagram of the support bearing apparatus of the variable stationary blade for gas turbines provided with the winding bush for repair which concerns on the Example of this invention. FIG. 2 is a detailed view of a portion A in FIG. 1, showing a state before the support bearing device is repaired. FIG. 2 is a detailed view of part A of FIG. 1, showing a state after repair of the support bearing device. It is a figure which shows the raw material shape of the winding bush for repair shown in FIG. It is a perspective view of the winding bush for repair shown in FIG. It is a perspective view of the variable stator blade at the time of repair and the winding bush for repair. It is a figure which shows the state which attached the winding bush for repair to the rotating shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Repair winding bush 5 Outer peripheral surface 6 Inner peripheral surface 7 Notch part 8 End part 10 Plate material 11 End part side 12 Slanted side 20 Variable stator blade 21 Rotating shaft 22 Repair range 30 Support bearing apparatus 31 Casing 32 Bearing fitting hole 35 Bearing 36 Inner peripheral surface 37 Outer peripheral surface 38 Flange portion 40 Drive lever 41 Seal portion 42 O-ring groove 43 O-ring 44 Seal portion receiver 50 Gas flow path

Claims (6)

  Of the shaft rotatably supported by the bearing, the outer diameter of the shaft is attached to the shaft by being wound around a portion of the surface of the shaft facing the bearing, and the outer diameter of the shaft is attached to the shaft. A repair winding bush, wherein the inner peripheral surface of the bearing is smaller than the inner diameter after wear, and the outer peripheral surface is formed so as to be in contact with the inner peripheral surface.   A notch having a gap in the circumferential direction of the shaft is formed from one end of the both ends in the axial direction of the shaft to the other end. Item 2. A winding bush for repair according to item 1.   The said notch is formed so that it may advance in the circumferential direction of the said axis | shaft as it goes to the direction of the said other edge part from the said one edge part of the said both ends. Wrap bush for repair described.   The winding bush for repair according to any one of claims 1 to 3, wherein the winding bush is fixed to the shaft by an adhesive when attached to the shaft. A bearing-side lubricating film is formed on the inner peripheral surface of the bearing,
The winding for repair according to any one of claims 1 to 4, wherein a bush side lubricating film made of the same material as the material constituting the bearing side lubricating film is formed on the outer peripheral surface. bush. A variable winding blade is rotated and has a rotating shaft as the shaft, and the winding bush for repair according to any one of claims 1 to 5 can be attached to the rotating shaft. A support bearing device for a variable stationary blade for a gas turbine.

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