JP5300515B2 - Steam turbine and method for assembling steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling method for surely and easily setting a clearance, while securing performance of a turbine. <P>SOLUTION: A steam turbine device 1 includes a turbine casing 15 constituted of an upper casing 13 and a lower casing 14, a turbine rotor 16, a support base 42 supporting the turbine casing, an assembling key 51 attachable-detachable to the support base and supporting the lower casing by interposing between the lower casing and the support base in a state of releasing installation of the lower casing and the upper casing, and an operation key 52 attachable-detachable to the support base and supporting the upper casing by interposing between the upper casing and the support base in a state of installing the lower casing and the upper casing. A core position of the turbine casing in a state of releasing installation and a core position C2 of the turbine casing in an installed state, are adjusted by an offset in the vertical direction. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a steam turbine, a steam turbine support device, a steam turbine assembling method, and a steam turbine manufacturing method, and more particularly to adjusting a gap between a turbine casing side and a turbine rotor side.

  2. Description of the Related Art As a steam turbine used in a generator or the like, there is known a steam turbine that includes a turbine casing configured by combining an upper casing and a lower casing and that houses a turbine rotor inside the turbine casing.

  Inside the turbine casing, casing side parts (stationary parts) such as an inner casing and seal parts are assembled. These casing-side parts and the turbine rotor are set so as to be arranged via a predetermined gap.

  Such a steam turbine is supported by a support device that includes a support base, an assembly key that is detachably disposed on the support base, and an operation key that is detachably disposed on the support base. The turbine rotor is provided so as to penetrate the casing in the axial direction, and both ends thereof are supported by the support base.

  In the released state (OFF state) in which the upper casing is removed, the center position of the casing is determined by an assembly key disposed on the support base. Necessary parts are assembled inside the lower casing, and then the upper casing is placed on the lower casing. Furthermore, the upper and lower casings are fixed to each other by tightening the horizontal plane tightening bolts, and then the casing is jacked up, the assembly key is removed, the operation key is installed on the support base, and the casing load is supported by the operation key. . The center position of the operation state (ON state) in which the lower casing and the upper casing are assembled is adjusted by an operation key arranged on the support base.

  In such an assembling method, an assembling method is usually employed in which the key thickness is adjusted so that the center positions of the casing coincide in the OFF state and the ON state. That is, when the height of the center position of the casing in the state supported by the assembly key is X0 and the height of the casing center position in the state supported by the operation key is Y0, X0 = Y0. In addition, the key thickness of the assembly key and the operation key is set.

  In such a steam turbine, due to deformation of the turbine casing, the center position of the casing may change before and after tightening, and the gap between the steam turbine casing-side component and the turbine rotor may change. For example, in an aged steam turbine, the change in the gap between the steam turbine casing side component and the turbine rotor tends to increase due to an increase in casing horizontal plane deformation.

Usually, when the gap changes, maintenance such as cutting of the teeth of the rotor is necessary. In addition, there is a method of adjusting the offset of the center position of the internal component by a gap change (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 3-67002

  However, the above technique has the following problems. That is, in the method of adjusting the offset of the center position of the internal component by the gap change, the relative position change between the casing-side part and the turbine rotor from the OFF state to the ON state is T (change in the direction in which the gap increases is + (plus ), The change in the direction in which the gap decreases is indicated by-(minus)), the gap value between the steam turbine casing side component and the turbine rotor in the ON state is D, and the gap set value in the OFF state is σ = DT If the σ value is a negative value, the shaft seal portion tooth tip bites into the turbine rotor, making it impossible to set the clearance.

  Further, if the shaft seal portion tooth tip is trimmed, the adjustment work becomes complicated, and unnecessary gap enlargement needs to be performed, leading to a decrease in performance of the steam turbine.

  The present invention has been made in view of the above circumstances, and an object thereof is to ensure and easily set the gap while ensuring the performance of the turbine.

A steam turbine apparatus according to an aspect of the present invention includes a turbine casing configured by assembling an upper casing and a lower casing, a turbine rotor disposed in the turbine casing, a support portion that supports the turbine casing, An assembly key that is detachable from a support portion and supports the lower casing by being interposed between the lower casing and the support portion in a released state in which the assembly of the lower casing and the upper casing is released; is detachable from the support unit, and a driving keys to support the upper casing interposed between the support portion and the upper casing in the operating state of said upper casing and said lower casing is assembled, the The center position of the turbine casing in the released state and the tap in the operating state The center position of the bin casing is offset, and at least one of the assembly key and the operation key is based on the change in the gap between the casing side component and the turbine rotor and the direction of the position change of the turbine casing relative to the turbine rotor. One of them is characterized in that the thickness is different from a reference thickness when the center position in the operation state and the release state is not offset.

A method for assembling a steam turbine according to another aspect of the present invention includes a step of disposing the lower casing in a turbine casing configured by assembling an upper casing and a lower casing on a support portion with an assembly key interposed therebetween. A step of accommodating the turbine rotor in the lower casing, a step of disposing the upper casing from above the lower casing on the support portion with an operation key interposed therebetween, the lower casing and the upper casing And a step of removing the assembly key, and the center position of the turbine casing in the release state and the center position of the turbine casing in the operation state are offset, and the release state is preset. And the casing side component and the turbine measured in the operating state And at least one of the assembly key and the operation key based on the maximum value of the change in the rotor gap and the direction of the position change of the turbine casing with respect to the turbine rotor. The position is set to a thickness different from a reference thickness when the position is not offset.

  According to the present invention, it is possible to reliably and easily set the gap while ensuring the performance of the turbine.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is an explanatory view showing a cross section in the ON state of the steam turbine apparatus 1 according to the present embodiment, FIG. 2 is a side view of the turbine casing 15, and FIG. 3 is a perspective view of the turbine case. FIG. 4 is a side view of the steam turbine apparatus 1 in the ON state. In the figure, arrows X, Y, and Z indicate three directions orthogonal to each other.

  4 to 7 are side views showing the same direction as that in FIG. 2, but the shape of the turbine casing is simplified for explanation.

  As shown in FIG.1 and FIG.4, the steam turbine apparatus 1 is provided with the steam turbine main body 11, and the support apparatus 12 which supports this steam turbine main body 11, and is used for a generator etc.

  The steam turbine body 11 includes a turbine casing 15 configured by assembling an upper casing 13 and a lower casing 14, and a turbine rotor 16 accommodated in the turbine casing 15.

  As shown in FIGS. 2 and 3, the upper casing 13 includes an upper dome portion 21 that is curved upward and forms a dome shape surrounding a semi-cylindrical space, and a lower casing provided on the outer periphery of the upper dome portion 21. 14 and an upper flange portion 22 fixed to 14 and various pipe portions 23 extending from the upper dome portion 21. Recess portions 24 through which the rotation shaft 16 a (shaft portion) of the turbine rotor 16 is inserted are formed at the lower portions of both ends of the upper casing 13 in the axial direction. A plurality of first supported portions 25 that protrude in the axial direction are formed in the axially opposite ends of the upper flange portion 22 and in the vicinity of the recessed portion 24. The first supported portions 25 are respectively provided on both sides of the recessed portion 24 in the Y direction orthogonal to the axial direction, and the first supported portions 25 are placed and supported on a driving key 52 described later. Thus, the upper casing 13 is supported by the support device 12.

  The lower casing 14 includes a lower dome portion 31 that is curved downward and forms a dome shape surrounding a semi-cylindrical space, and a lower flange portion 32 that is provided on the outer periphery of the lower dome portion 31 and is fixed to the upper casing 13. And various pipes 33. Recess portions 34 through which the rotating shaft 16 a of the turbine rotor 16 is inserted are formed at the upper portions of both ends in the axial direction of the lower casing 14. A second supported portion 35 that protrudes in the axial direction is formed on both ends in the axial direction of the lower flange portion 32 and on both sides in the Y direction of the recessed portion 34. The lower casing 14 is supported by the support device 12 by the second supported portion 35 being supported by an assembly key 51 described later in the OFF state. The first supported portion 25 protrudes and extends to both ends in the axial direction from the second supported portion 35.

  The upper flange portion 22 and the lower flange portion 32 are each provided with a plurality of fastening portions 20 along the outer periphery. In this tightening portion, the upper flange portion 22 and the lower flange portion 32 are fastened and fixed by the tightening bolt 20a.

  As shown in FIG. 1, casing-side parts (stationary parts) 19 such as upper and lower inner casings 17 and seal parts 18 are assembled inside the turbine casing 15 as internal components. The casing side component 19 includes, for example, a packing head 19a, a nozzle diaphragm 19b, a nozzle box 19c, and a packing ring 19d in addition to the inner casing 17 and the seal component 18 described above.

  A turbine rotor 16 (rotor side part) is accommodated as a rotating part in a cylindrical space surrounded by the casing side part 19.

  In the turbine rotor 16, a rotating shaft 16 a extending in the X direction passes through the turbine casing 15, and both ends thereof are supported by third support portions 45 described later.

  As shown in FIG. 1, the support device 12 is disposed on the foundation portion 41 disposed at both axial ends of the steam turbine body 11 and the foundation portion 41, and supports both axial ends of the steam turbine body 11. And a support base 42 (support portion).

  The support base 42 includes a first support portion 43 that supports the upper casing 13, a second support portion 44 that supports the lower casing 14, and a third support portion 45 (bearing portion) that supports the rotating shaft 16 a of the turbine rotor 16. And is configured. The first support portion 43 and the second support portion 44 are provided on both sides in the Y direction of the shaft so as to correspond to the first supported portion 25 and the second supported portion 35, respectively. The 3rd support part 45 is provided in the position corresponding to the both ends of the rotating shaft 16a.

  In the ON state shown in FIG. 4, a removable operation key 52 is provided on the first support portion 43. Both ends of the rotating shaft 16 a of the turbine rotor 16 are supported by the third support portion 45. The operation key 52 is detachably provided on the support base 42 and supports the upper casing 13 by being interposed between the upper casing 13 and the support base 42 when the upper casing 13 is assembled to the lower casing 14.

  The assembly key 51 placed on the second support portion 44 in the OFF state shown in FIG. 5 is removed in the ON state and stored by being fixed to the side surface of the support base 42 with bolts, for example.

  The assembly key 51 and the operation key 52 are each made of a metal plate-like member whose upper and lower surfaces are configured horizontally.

  In the ON state, as shown in an enlarged view in FIG. 1, the turbine rotor 16 and the casing side component 19 are arranged with a predetermined gap D therebetween. In FIG. 1, the gap D on the upper side of the turbine rotor 16 is shown, but the gap D is similarly formed on the lower side of the turbine rotor 16. That is, the turbine rotor 16 and the casing-side component 19 are installed so that the axial center position of the turbine rotor 16 and the central position of the turbine casing 15 are set to be equal to each other, although they do not contact each other. . That is, the turbine rotor 16 and the turbine casing 15 are supported so as to be coaxial.

  In FIG. 5, the side view of the steam turbine apparatus 1 in an OFF state is shown. In this OFF state, the lower casing 14 is placed on the first support portion 44 via a removable assembly key 51. The operation key 52 is not installed in the OFF state.

  The assembly key 51 is detachably provided on the support base 42 and is interposed between the lower casing 14 and the support base 42 in the OFF state in which the assembly of the lower casing 14 and the upper casing 13 is released. The casing 14 is supported.

  As shown in FIG. 5, in the OFF state where the upper casing 13 is removed, the support point height, that is, the support height at the center position is adjusted by the assembly key 51 arranged on the support base 42. That is, since the lower casing 14 is placed and supported on the assembly key 51, the center position is set at a position corresponding to the thickness of the assembly key 51. Accordingly, the support height at the center position is adjusted by setting the thickness of the assembly key 51.

  The generation mechanism of the change in the gap D between the turbine rotor 16 and the casing side component 19 in the OFF state and the ON state will be described with reference to FIGS.

  FIGS. 6 and 7 show an OFF state and an ON state of the steam turbine 100 when the center position of the turbine casing 15 is not offset-adjusted between the ON state and the OFF state, respectively, as a comparative example of the present embodiment.

  In the steam turbine 100, the thicknesses Ta0 and Tb0 of the keys 51 and 52 are set so that the center positions of the casings match in the OFF state and the ON state. That is, when the center position height of the casing in the state supported by the assembly key 51 is X0 and the casing center position height in the state supported by the operation key 52 is Y0, X0 = Y0. As described above, the thickness Ta0 of the assembly key 51 and the thickness Tb0 of the operation key 52 are set. Here, as an example, Ta0 = Tb0. It should be noted that the dimension X0... When the offset of the center position of the turbine casing 15 is not adjusted between the ON state and the OFF state. Y0. Ta0. Tb0 is set as a reference value.

  FIG. 8 is a schematic diagram illustrating a situation in which the center position of the turbine casing 15 changes due to the effect of casing horizontal plane deformation when the turbine casing 15 as a comparative example is deformed. In the figure, C1 indicates the heart position in the OFF state, and C2 indicates the heart position in the ON state.

  In the state shown in FIG. 8, each of the upper casing 13 and the lower casing 14 of the steam turbine 100 is deformed in a convex shape near the center. In this case, when the upper flange portion 22 and the lower flange portion 32 are tightened with tightening bolts, the center position of the casing central portion changes downward.

  FIG. 9 is a schematic diagram showing the casing axial distribution when the position change T, which is the position change of the casing side component 19 with respect to the turbine rotor 16 from the OFF state to the ON state, is a downward change. According to FIG. 9, it can be seen that the central portion is positioned lower (changes downward) than the supporting portions at both ends in the axial direction. The change in the gap D occurs due to the superposition of the change in the casing center position described above.

  FIG. 10 is a cross-sectional view showing a case where the inner casing 17 of the steam turbine 100 as a comparative example is deformed. The inner casing 17 is in an inner open state in which the upper and lower inner casings 17a and 17b are in contact with each other on the outer peripheral side, and the upper and lower inner casings 17a and 17b are arranged at intervals on the inner peripheral side. In this case, when the tightening bolts are tightened between the upper flange portion 22 and the lower flange portion 32, the center position in the central portion of the turbine casing 15 changes upward.

  FIG. 11 is a schematic diagram showing the casing axial distribution when the position change T of the casing side component 19 with respect to the turbine rotor 16 from the OFF state to the ON state is an upward change. According to FIG. 11, it can be seen that the central portion is located higher than the support portions at both ends in the axial direction (changes upward). The change in the dimension of the gap D occurs due to the superposition of the above-described change in the casing center position.

  The change of the gap D will be described with reference to FIGS. FIG. 12 shows the change in the upper gap D when the position change T is an upward change, and FIG. 13 shows the change in the lower gap D when the position change T is an upward change. FIG. 14 shows changes in the upper gap D when the position change T is a downward change, and FIG. 15 shows changes in the lower gap D when the position change T is a downward change. .

  The gap setting value that is the height dimension of the upper gap D in the OFF state is σt, the lower gap setting value is σb, the upper gap value in the ON state is Dt, and the lower gap value is Db.

  When the position change T is an upward change, as shown in FIG. 12, the upper gap D becomes wider by the position change T when changing from the OFF state to the ON state. That is, Dt = σt + T. Further, as shown in FIG. 13, the lower gap D becomes narrower by the position change T, and Db = σb−T.

  When the position change T is a downward change, as shown in FIG. 14, the upper gap D becomes narrower by the position change T when changing from the OFF state to the ON state, and Dt = σt− | T | (Absolute value T). Further, as shown in FIG. 15, the lower gap D becomes wider by the position change T. That is, Db = σb + | T | (absolute value T).

  Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to the present embodiment will be described with reference to FIGS. 4 and 5. In this embodiment, the case where the position change T with respect to the turbine rotor 16 of the casing side component 19 from the OFF state to the ON state is an upward change will be described.

  First, information regarding the position change T is acquired. This position change T can be acquired in advance by measurement or analysis. For example, the inner diameter of the inner casing in the OFF state and the inner diameter of the inner casing in the ON state are measured, and the position change T can be obtained from this difference. In addition, the position change T may be acquired by analysis.

  The turbine rotor 16 is incorporated as an internal component in the space formed inside the inner casing and the seal part inside the lower casing 14 in the OFF state shown in FIG. In this state, the rotating shaft 16a of the turbine rotor 16 extends to the outside of the lower casing 14 through the recess, and is supported by the third support portions 45 on both sides in the axial direction. The lower casing 14 is supported on the upper surface of the assembly key 51 on the first support portion 43 as in the OFF state.

  Next, the upper casing 13 is placed and assembled.

  The vertical dimension of the assembly key 51 and the operation key 52 is determined based on the position change T. That is, the dimensions are set on the assumption that the center position moves in the subsequent tightening process.

  In the present embodiment, when the upper gap value between the casing-side component 19 and the turbine rotor 16 in the ON state is Dt and the lower gap value is Db, the upper gap setting value σt = Dt−T in the OFF state, The side gap set value σb = Db + T. When σt is a negative value, Dt <T.

  Therefore, in this embodiment, the thickness Ta1 of the assembly key 51 is made thicker than the reference value Ta0 so that the height X1> X0 of the center position. On the other hand, the thickness Tb1 of the operation key 52 is set equal to the reference value Tb0, and the height Y1 of the center position is set to Y0. That is, since the reference value is X0 = Y0, the height X1> Y1 of the heart position.

  Subsequently, the upper casing 13 and the lower casing 14 are fastened and fixed to each other with bolts and nuts by fastening the upper and lower flange portions with a plurality of fastening bolts.

  After tightening and fixing, the operation key 52 is installed, the assembly key 51 is extracted, and is turned on. When the assembly key 51 is extracted, the center position of the turbine casing 15 is supported by the operation key 52. At this time, since X1> Y1, the center position of the casing is shifted downward.

  Therefore, it simulates that the position of the casing-side component 19 changes downward from the OFF state to the ON state, and is equivalent to reducing the upward position change T by X1-Y1. For this reason, it is possible to adjust σt to a positive value by adjusting the amount of X1-Y1.

  That is, the position change from the OFF state to the ON state is T (change in the direction in which the gap increases is indicated by + (plus), change in the direction in which the gap decreases is indicated by-(minus)), and the casing side component in the operating state 19 and the turbine rotor 16 have a gap value of D, and when the gap setting value in the OFF state is σ = DT, when the σ value is a negative value, the support height and operation of the assembly key 51 are determined. The σ value becomes a positive value by apparently decreasing the T value by offset adjustment of the support height at the key 52 for use.

  For example, when the steam turbine apparatus used at the reference value is deformed over time, the assembly method of the present embodiment is used during maintenance, so that the center position can be easily adjusted even when the turbine casing 15 is deformed. Can be set, and the gap can be kept good.

  According to the steam turbine, the steam turbine support device, the steam turbine assembly method, and the steam turbine manufacturing method according to the present embodiment, the following effects can be obtained. That is, it is possible to apparently reduce the change in the gap between the casing-side component 19 and the turbine rotor 16 from the OFF state to the ON state, and the steam turbine is assembled without performing unnecessary gap enlargement during assembly. Things will be possible. For this reason, steam turbine performance can be improved and reliability can be maintained. Further, the gap can be easily maintained satisfactorily only by adjusting the thicknesses of the assembly key 51 and the operation key 52.

[Second Embodiment]
Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to a second embodiment of the present invention will be described with reference to FIGS. 16 and 17. Note that in this embodiment, except for the setting of the key thickness, it is the same as that of the first embodiment, and therefore a common description is omitted. FIG. 16 is a side view of the steam turbine in the OFF state, and FIG. 13 is a side view of the steam turbine in the ON state. 16 and 17 are side views showing the same direction as that in FIG. 2, but the shape of the turbine casing is simplified for explanation.

  In this embodiment, the upper gap set value in the OFF state is σt = Dt−T, the lower gap set value is σb = Db + T, the position change T is an upward change, and σt is a negative value.

  Therefore, the thickness Tb2 of the operation key 52 in the ON state is made thinner than the reference value Tb0, and the height Y2> Y0 of the casing center position in the ON state is set. On the other hand, the thickness Ta2 of the assembly key 51 in the OFF state is set equal to the reference value Ta0, and the height Y2 of the casing center position in the OFF state is set to Y0. That is, since X0 = Y0, X2> Y2.

  In the present embodiment, it is simulated that the center position of the casing changes downward from the OFF state to the ON state, and is equivalent to reducing the upward position change T by the size of X2-Y2. . For this reason, it is possible to adjust σt to a positive value by adjusting the amount of X2-Y2.

  However, since the position change T actually occurs before switching from the assembly key 51 to the operation key 52, the upper half casing is assembled and the set size σt of the upper gap D is supported by the assembly key 51. Becomes negative (the shaft seal portion and the turbine rotor 16 are in contact). Even if the gap setting value σt, which is a setting target in the OFF state, is a negative value, the actual height of the gap D cannot be set to a negative value. (Z direction in the figure) The dimensions are arranged to be larger than σt. For this reason, the dimension of the gap D in the ON state is wider than the Dt by a minus value of σt.

  On the other hand, the lower gap D can be set to ensure the target dimension value Db in the operating state.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

[Third Embodiment]
Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to a third embodiment of the present invention will be described with reference to FIGS. In the present embodiment, since the key thickness is not set except for the setting of the key thickness, common description is omitted. FIG. 18 is a side view of the steam turbine in the OFF state, and FIG. 19 is a side view of the steam turbine in the ON state. 18 and 19 are side views showing the same direction as that in FIG. 2, but the shape of the turbine casing is simplified for explanation.

  This embodiment is a combination of the first and second embodiments when the position change T is an upward change.

  That is, the thickness Ta3 of the assembling key 51 is made thicker than the reference value Ta0, and the height X3> X0 of the casing center position in the OFF state is set. On the other hand, the thickness Tb3 of the operation key 52 is reduced to the reference value Tb0, and the height Y3> Y0 of the casing center position in the ON state is set. That is, since X0 = Y0, X3> Y3.

  Also in this embodiment, the same effect as the first embodiment and the second embodiment can be obtained. Furthermore, according to this embodiment, the position change T can be reduced by the above-described configuration, and the casing center position in the operating state can be adjusted to be offset downward as a whole.

[Fourth Embodiment]
Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to a fourth embodiment of the present invention will be described with reference to FIGS. 120 and 21. In the present embodiment, except for the setting of the key thickness, the present embodiment is the same as the first to third embodiments, and thus a common description is omitted. 20 is a side view of the steam turbine in the OFF state, and FIG. 21 is a side view of the steam turbine in the ON state. 20 and 21 are side views showing the same direction as that in FIG. 2, but the shape of the turbine casing is simplified for explanation.

  In the present embodiment, the position change T from the OFF state to the ON state is a downward change. When the upper gap value between the casing side component 19 and the turbine rotor 16 in the operating state is Dt and the lower gap value is Db, the upper gap setting value in the OFF state is σt = Dt + | T | The value is σb = Db− | T |. When σb is a negative value, Db <| T |.

  Therefore, in the present embodiment, the thickness Ta4 of the assembly key 51 in the OFF state is made thinner than the reference value Ta0, and the height X4 <X0 of the casing center position in that state. On the other hand, the thickness Tb4 of the operation key 52 in the ON state is set equal to the reference value Tb0, and the height of the casing center position Y4 = Y0. That is, X4 <Y4.

  In this case, it is simulated that the position of the casing side component 19 is changed upward from the OFF state to the ON state, which is synonymous with decreasing the position change T downward by the dimension of Y4-X4. By adjusting the amount of X4, σb can be adjusted to a positive value.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

[Fifth Embodiment]
Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to a fifth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, except for the setting of the key thickness, the present embodiment is the same as the first to fourth embodiments, and thus a common description is omitted. FIG. 22 is a side view of the steam turbine in the OFF state, and FIG. 23 is a side view of the steam turbine in the ON state. 22 and 23 are side views showing the same direction as that in FIG. 2, but the shape of the turbine casing is simplified for explanation.

  In the present embodiment, the upper gap set value in the ON state is σt = Dt + | T |, the lower gap set value is σb = Db− | T |, the position change T is a downward change, and the lower side is in the ON state. The condition that the gap value σb is negative is the same as in the fourth embodiment.

  The thickness Tb5 of the operation key 52 in the ON state is made thicker than the reference value Tb0, and the casing center position in this state is set to Y5> Y0. On the other hand, the thickness Ta5 of the assembly key 51 in the OFF state is set to the same thickness as the reference value Tb0, and the height X5 = X0 of the casing center position is set.

  In this case, it is simulated that the casing center position changes upward from the OFF state to the ON state, and Y5-X5 is equivalent to reducing the downward position change T, and the amount of Y5-X5 is By adjusting, σb can be adjusted to a positive value.

  However, when σb is a negative value, the set dimension σb of the lower gap D is negative (the shaft seal portion and the turbine rotor 16 are in contact) while being supported by the assembly key 51. Even if the gap setting value σb, which is a setting target in the OFF state, is a negative value, the actual height of the gap D cannot be made a negative value. The dimension (Z direction in the figure) is arranged to be larger than σb. For this reason, the dimension of the gap D in the ON state is a gap that is wider by a minus value of σb than the dimension value Db that is the setting target.

  On the other hand, the upper gap D can be set so as to ensure the target dimension value Dt in the operating state.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

[Sixth Embodiment]
Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to a sixth embodiment of the present invention will be described with reference to FIGS. 24 to 25. In the present embodiment, except for the setting of the key thickness, the present embodiment is the same as the first to fifth embodiments, and thus a common description is omitted. FIG. 24 is a side view of the steam turbine in the OFF state, and FIG. 25 is a side view of the steam turbine in the ON state. 24 and 25 are side views showing the same direction as in FIG. 2, but the shape of the turbine casing is simplified for the sake of explanation.

  This embodiment is implemented by combining the fourth and fifth embodiments when the heart position change T is a downward change.

  That is, the thickness Ta6 of the assembly key 51 is made thinner than the reference value Ta0 so that the center position height X6 <X0, and the thickness Tb6 of the operation key 52 is made thicker than the reference value Tb0 to increase the center position height. By setting Y6> Y0, the position change T is reduced, and the casing center position in the operating state is offset-adjusted as a whole.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

[Seventh Embodiment]
Hereinafter, a steam turbine assembling method and a steam turbine manufacturing method according to a seventh embodiment of the present invention will be described with reference to FIG. In addition, in this embodiment, since it is the same as that of the said 1st thru | or 6th Embodiment except the point which uses the level plate 60 which can adjust thickness, common description is abbreviate | omitted. FIG. 26 is a cross-sectional view showing the configuration of the level plate 60.

  The level plate 60 is used as the operation key 52 and the assembly key 51 described in the above embodiment. The level plate 60 includes a screw portion 61 having an operation portion 61a at an end portion, a lower taper member 62 that is engaged with the screw portion 61, an upper taper member 63 that is placed on the taper surface of the lower taper member 62, And a case portion 64 including a lid member 66 placed on the upper taper member 63.

  The case portion 64 includes a case main body 65 that forms a housing portion 65a for housing the screw portion 61, the lower taper member 62, and the upper taper member 63 therein, and an upper taper member so as to close the opening on the upper surface of the case main body. And a lid member 66 placed on 63.

  The screw portion 61 extends in the horizontal direction within the case body, and a screw groove is formed in a spiral shape on the outer peripheral surface. An end portion of the screw portion 61 penetrates the case main body, and the end portion forms an operation portion 61 a outside the case portion 64.

  The lower taper member 62 includes a tapered upper surface 62 a that is inclined in the vertical direction and the axial direction of the screw portion 61, and is engaged with the screw portion 61. The lower taper member 62 has a dimension of about half of the accommodating portion in the axial direction.

  The upper taper member 63 includes a tapered lower surface 63 a that is inclined in the vertical direction and the axial direction of the screw portion 61, and is placed on the lower taper member 62. The upper taper member 63 has the same size as the accommodating portion 65a in the axial direction. The upper surface of the upper taper member 63 forms a horizontal plane. A plate-like lid member whose upper and lower surfaces are configured horizontally is disposed on the horizontal plane.

  In the level plate 60 configured as described above, when the operation portion 61a is operated and the screw portion 61 rotates, the lower taper member 62 moves along the axial direction. As the axial movement moves, the upper surface 62a and the lower surface 63a of the tapered shape move relative to each other, so that the upper surface of the upper taper member 63 and the lid member 66 move up and down. Therefore, it is possible to arbitrarily adjust the thickness of the level plate 60 according to the operation of the operation unit 61a.

  According to the present embodiment, by using the level plate 60 as the assembly key 51 and the operation key 52 used in the first to sixth embodiments, an arbitrary thickness can be adjusted. For this reason, offset adjustment can be facilitated.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.

For example, in each of the above-described embodiments, the example in which the dimension is determined based on the positional change T between the casing-side component 19 and the turbine rotor 16 when the dimension of the keys 51 and 52 is set has been described. The reference position change T changes in the axial direction of the turbine rotor 16, but the portion of the position change T where the change is maximum may be used as a reference, or another part may be used as a reference. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
(1)
A turbine casing configured by assembling an upper casing and a lower casing;
A turbine rotor disposed within the turbine casing;
A support for supporting the turbine casing;
An assembly key that is detachable from the support part and supports the lower casing interposed between the lower casing and the support part in a released state in which the assembly of the lower casing and the upper casing is released.
An operation key that is detachable from the support portion and supports the upper casing by being interposed between the upper casing and the support portion in an operation state in which the lower casing and the upper casing are assembled;
The steam turbine apparatus, wherein the center position of the turbine casing in the released state and the center position of the turbine casing in the operation state are offset adjusted in the vertical direction.
(2)
A support portion for supporting a turbine casing configured by assembling an upper casing and a lower casing;
An assembly key that is detachable from the support part and supports the lower casing interposed between the lower casing and the support part in a released state in which the assembly of the lower casing and the upper casing is released.
An operation key that is detachable from the support portion and supports the upper casing by being interposed between the upper casing and the support portion in an operation state in which the lower casing and the upper casing are assembled;
An apparatus for supporting a steam turbine, wherein the center position of the turbine casing in the released state and the center position of the turbine casing in the operating state are offset adjusted in the vertical direction.
(3)
The apparatus for supporting a steam turbine according to (2), wherein the center position is offset-adjusted in the vertical direction by setting the vertical dimension of the assembly key and the operation key.
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(4)
The support portion further includes a bearing portion that supports a shaft portion of the turbine rotor extending outside the turbine casing in the operation state,
In the operating state, a casing side part including an inner casing and a seal part is disposed inside the turbine casing,
The steam turbine support device according to (2), wherein the casing-side component and the turbine rotor are set so as to be disposed with a predetermined gap therebetween.
(5)
Each of the upper casing and the lower casing includes a dome portion that houses the turbine rotor, and a flange portion that is formed on an outer peripheral edge of the dome portion,
In the operating state, the shaft portion of the turbine rotor protrudes outside the turbine casing and is supported by the bearing portion, and the flange portion of the upper casing and the flange portion of the lower casing are arranged in the outer circumferential direction. The apparatus for supporting a steam turbine according to (4), wherein the flange portion of the upper casing is mounted on the operation key by being fastened and fixed at a plurality of locations along the operation key.
(6)
The assembly key or the operation key includes a level plate whose thickness can be arbitrarily changed, and is configured to be capable of adjusting the height of the center position in the release state and the operation state ( 2) A support device for a steam turbine as described above.
(7)
Arranging the lower casing in the turbine casing configured by assembling the upper casing and the lower casing on the support portion with an assembly key interposed therebetween;
Accommodating the turbine rotor in the lower casing;
Arranging the upper casing from above the lower casing on the support portion with an operation key interposed therebetween;
Tightening and fixing the lower casing and the upper casing;
Removing the assembly key,
A steam turbine assembling method, wherein the center position of the turbine casing in the released state and the center position of the turbine casing in the operating state are offset adjusted in the vertical direction.
(8)
(7) The offset amount of the center position is determined based on the maximum value of the change in the gap between the casing side component and the turbine rotor measured in advance in the release state and the operation state. A method for assembling a steam turbine.
(9)
The steam turbine assembling method according to (7), wherein an offset amount of the center position is determined based on a maximum value of the change in the gap calculated by analysis.
(10)
The steam turbine assembling method according to (7), wherein offset adjustment is performed downward when assembling the center position of the turbine casing from the released state to the operating state.
(11)
The steam turbine assembling method according to (7), wherein offset adjustment is performed upward when the center position of the turbine casing is assembled from the released state to the operating state.
(12)
The method for assembling a steam turbine according to (7), wherein the thickness of the assembling key is different from the thickness of the operating key.
(13)
Arranging the lower casing in the turbine casing configured by assembling the upper casing and the lower casing on the support portion with an assembly key interposed therebetween;
Accommodating the turbine rotor in the lower casing;
Arranging the upper casing from above the lower casing on the support portion with an operation key interposed therebetween;
Tightening and fixing the lower casing and the upper casing;
Removing the assembly key,
A method for manufacturing a steam turbine, wherein the center position of the turbine casing in the released state and the center position of the turbine casing in the operating state are offset adjusted in the vertical direction.

1 is a side view showing a partially cutaway steam turbine apparatus according to a first embodiment of the present invention. The side view which shows the turbine casing of the same steam turbine apparatus. The perspective view which shows the turbine casing. The side view which shows the ON state of the steam turbine apparatus. The side view which shows the OFF state of the steam turbine apparatus. The side view which shows the ON state of the steam turbine apparatus as a comparative example. The side view which shows the OFF state of the steam turbine apparatus as a comparative example. Explanatory drawing which shows an example of the generation | occurrence | production mechanism of a cardiac position change. The graph which shows the relationship between the axial direction position of a steam turbine, and the position change T. FIG. Explanatory drawing which shows an example of the generation | occurrence | production mechanism of a cardiac position change. The graph which shows the relationship between the axial direction position of a steam turbine, and the position change T. FIG. Explanatory drawing which shows the change of the upper gap | interval in a comparative example. Explanatory drawing which shows the change of the lower side gap in a comparative example. Explanatory drawing which shows the change of the upper gap | interval in a comparative example. Explanatory drawing which shows the change of the lower side gap in a comparative example. The side view which shows the ON state of the steam turbine apparatus which concerns on 2nd Embodiment of this invention. The side view which shows the OFF state of the steam turbine apparatus which concerns on 2nd Embodiment of this invention. The side view which shows the ON state of the steam turbine apparatus which concerns on 3rd Embodiment of this invention. The side view which shows the OFF state of the steam turbine apparatus which concerns on 3rd Embodiment of this invention. The side view which shows the ON state of the steam turbine apparatus which concerns on 4th Embodiment of this invention. The side view which shows the OFF state of the steam turbine apparatus which concerns on 4th Embodiment of this invention. The side view which shows the ON state of the steam turbine apparatus which concerns on 5th Embodiment of this invention. The side view which shows the OFF state of the steam turbine apparatus which concerns on 5th Embodiment of this invention. The side view which shows the ON state of the steam turbine apparatus which concerns on 6th Embodiment of this invention. The side view which shows the OFF state of the steam turbine apparatus which concerns on 6th Embodiment of this invention. Sectional drawing which shows the level plate of the steam turbine apparatus which concerns on 7th Embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 ... Steam turbine apparatus, 11 ... Steam turbine main body, 12 ... Support apparatus,
13 ... Upper casing, 14 ... Lower casing, 15 ... Turbine casing,
16 ... Turbine rotor, 16a ... Rotating shaft, 17 ... Inner casing, 18 ... Sealing part,
21 ... Upper dome part, 22 ... Upper flange part, 25 ... First supported part, 31 ... Lower dome part,
32 ... Lower flange part, 35 ... Second supported part, 41 ... Base part,
42 ... support stand, 43 ... first support portion, 44 ... second support portion, 45 ... third support portion,
51: assembly key, 52: operation key.

Claims (2)

A turbine casing configured by assembling an upper casing and a lower casing;
A turbine rotor disposed within the turbine casing;
A support for supporting the turbine casing;
An assembly key that is detachable from the support part and supports the lower casing interposed between the lower casing and the support part in a released state in which the assembly of the lower casing and the upper casing is released.
An operation key that is detachable from the support portion and supports the upper casing by being interposed between the upper casing and the support portion in an operation state in which the lower casing and the upper casing are assembled;
The center position of the turbine casing in the released state and the center position of the turbine casing in the operating state are offset,
Based on the change in the gap between the casing side component and the turbine rotor and the direction of change in the position of the turbine casing relative to the turbine rotor, at least one of the assembly key and the operation key is in the operation state and the release state. A steam turbine apparatus having a thickness different from a reference thickness when the center position is not offset. Arranging the lower casing in the turbine casing configured by assembling the upper casing and the lower casing on the support portion with an assembly key interposed therebetween;
Accommodating the turbine rotor in the lower casing;
Arranging the upper casing from above the lower casing on the support portion with an operation key interposed therebetween;
Tightening and fixing the lower casing and the upper casing;
Removing the assembly key,
The center position of the turbine casing in the released state and the center position of the turbine casing in the operating state are offset,
Based on the maximum value of the change in the gap between the casing-side component and the turbine rotor measured in advance in the release state and the operation state, and the direction of the positional change of the turbine casing relative to the turbine rotor, the assembly key and the The steam turbine assembling method, wherein at least one of the operation keys is set to a thickness different from a reference thickness when the center positions of the operation state and the release state are not offset.

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