JP2020007947A - Rotary machine and disassembly method of rotary machine - Google Patents

Abstract

To provide a rotary machine capable of preventing the contact of a rotor part and a stationary member during decomposition of the rotary machine, and an assembly or a disassembly method of the rotary machine.SOLUTION: A rotary machine in which outer casings 2A and 2B and internal parts are each vertically divided into two parts. The outer casing includes the outer upper half 2A and the outer lower half 2B, and the internal part includes an inner upper half and an inner lower half. The rotary machine comprises: a support arm 6 provided so as to protrude horizontally from the inner upper half for supporting the internal part to the outer casing; an alignment arm 8 provided so as to protrude horizontally from the inner lower half, and formed with a bolt hole 16 through which a jack bolt for adjusting the height position of the inner lower half with respect to the outer lower half is inserted; and a jack-up amount restricting part 10 fixed to the outer lower half and configured to restrict a jack-up amount of the inner lower half with respect to the outer lower half by the jack bolt.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a rotating machine and a method for disassembling a rotating machine.

  As a casing of a rotating machine such as a steam turbine and a gas turbine, a casing having a double structure may be adopted.

  For example, Patent Literature 1 discloses a steam turbine having a double casing structure including an inner casing and an outer casing which are divided into upper and lower parts in a horizontal plane. In this steam turbine, the entire weight of the inner casing is supported by the outer casing by supporting the support arm projecting laterally from the upper half of the inner casing on the outer casing. A centering arm is provided in the lower half of the inner casing so as to protrude laterally from the lower half, and the centering arm is provided with a screw hole for a jack bolt. At the time of assembling the steam turbine, the centering adjustment is performed between the outer casing and the inner casing using jack bolts.

JP-A-58-2401

  Meanwhile, when disassembling a rotary machine having a casing having a double structure as described above, the internal components (the inner casing and the like) may be moved in the vertical direction relative to the outer casing. At this time, if the rotor portion accommodated in the casing and a stationary member (for example, an internal component) surrounding the rotor portion come into contact with each other, the rotor portion or the turbine component such as the stationary member may be damaged.

  In view of the above circumstances, at least one embodiment of the present invention has an object to provide a rotating machine and a method for disassembling a rotating machine that can prevent contact between a rotor unit and a stationary member when the rotating machine is disassembled.

(1) The rotating machine according to at least one embodiment of the present invention includes:
An outer casing, comprising: an inner part supported by the outer casing inside the outer casing, a rotating machine in which the outer casing and the inner part are each vertically divided into two parts,
The outer casing includes an outer upper half and an outer lower half,
The internal component includes an inner upper half and an inner lower half,
A support arm that is provided to project horizontally from the inner upper half, and supports the internal component on the outer casing;
Alignment provided with a bolt hole that is provided to protrude horizontally from the inner lower half and through which a jack bolt for adjusting the height position of the inner lower half with respect to the outer lower half is inserted. Arm and
A jack-up amount restricting unit fixed to the outer lower half, for restricting a jack-up amount of the inner lower half with respect to the outer lower half by the jack bolt.

  In this specification, an internal component of a rotating machine is a stationary member provided around a rotor section of the rotating machine. When the rotating machine is a steam turbine or a gas turbine, the internal components include, for example, an inner casing that at least partially accommodates a turbine rotor, a blade ring to which a turbine vane is fixed, and the like.

In the above configuration (1), the inner lower half can be jacked up with respect to the outer lower half by screwing a jack bolt into a bolt hole provided in the centering arm of the inner lower half. At this time, since the inner lower half rises in accordance with the jack-up amount with respect to the outer lower half and the rotor part, the rotor part and the internal parts ( Radial clearance between the stationary part).
In this regard, in the configuration of (1), the jack-up amount regulating portion for regulating the jack-up amount of the inner lower half with respect to the outer lower half is provided. The amount of jack-up in the half (internal parts) is regulated. Therefore, when the inner lower half (internal component) is jacked up with respect to the outer lower half as described above, the rotor of the rotating machine and the stationary member (internal component) around the rotor are connected. The radial clearance between them can be appropriately maintained.
Therefore, according to the above configuration (1), when the inner lower half (internal component) is jacked up with respect to the outer lower half (outer casing), contact between the rotor portion and the stationary member is prevented. Can be.

(2) In some embodiments, in the configuration of the above (1),
The distance between the jack-up amount regulating portion and the alignment arm in the up-down direction in a state where the rotating machine is assembled, the distance between the rotor portion and the stationary member of the rotating machine at the lowermost portion of the rotating machine. It is characterized by being smaller than the radial clearance.

As the jack-up amount by the jack bolt increases, the inner lower half rises with respect to the outer lower half and the rotor part, and the radial clearance between the rotor part and the stationary part at the bottom of the steam turbine decreases. .
In this regard, according to the configuration (2), the distance between the jack-up amount regulating portion and the alignment arm in the vertical direction is set smaller than the radial clearance between the rotor portion and the stationary member. Even if the jack-up amount is maximized and the distance between the jack-up amount regulating portion and the alignment arm becomes zero, the above-mentioned clearance can be maintained without fail. Therefore, when the inner lower half (internal component) is jacked up with respect to the outer lower half (outer casing), contact between the rotor portion and the stationary member can be more reliably prevented.

(3) In some embodiments, in the configuration of the above (1) or (2),
The rotating machine includes:
Further comprising a first liner provided at least partially between the outer lower half and the support arm in the up-down direction,
The first liner is fixed to the outer lower half so as to partially overlap the alignment arm in plan view, and forms the jack-up amount regulating portion.

  According to the above configuration (3), the first liner is fixed to the outer lower half so as to partially overlap with the alignment arm in plan view. The relative position of the alignment arm with respect to the outer lower half in the direction can be regulated.

(4) In some embodiments, in the configuration of the above (3),
The first liner is fixed to the outer lower half by a first mounting bolt,
The support arm is provided with a through hole along a center axis of the first mounting bolt in a region including the entire first mounting bolt in plan view.

  According to the above configuration (4), since the support arm is provided with the through hole through which the first mounting bolt can pass, the first mounting bolt for fixing the first liner is tightened or removed through the through hole. Or work can be performed. Therefore, the first liner can be removed and attached in a state where the inner upper half is assembled to the inner lower half. Thus, for example, the thickness of the first liner can be adjusted while the inner upper half is still assembled to the inner lower half.

(5) In some embodiments, in the configuration of (3) or (4), a female screw is formed on a side surface of the first liner.

  According to the configuration of the above (5), since the female screw is formed on the side surface of the first liner, the detachable bolt is screwed into the female screw, and the first liner is pulled out and inserted together with the detachable bolt in the horizontal direction. One liner can be attached and detached. Thus, for example, the thickness of the first liner can be adjusted while the inner upper half is still assembled to the inner lower half.

(6) In some embodiments, in any one of the above configurations (3) to (5),
The rotating machine includes:
The apparatus further includes a second liner provided at least partially between the support arm and the outer upper half in a vertical direction.

  Depending on the operating conditions of the rotating machine, an upward load may act on internal components (such as the inner casing). For example, when the rotating machine is a steam turbine, an upward force may act on internal components due to steam flowing from a nozzle provided in an inner lower half. In this regard, according to the configuration of (6), since the second liner is interposed between the support arm (internal component) and the outer upper half portion (outer casing), a space in which the internal component can move in the vertical direction. Is reduced. Therefore, it is possible to suppress the lifting of the internal component from the outer casing during the operation of the rotary machine.

(7) In some embodiments, in the configuration of the above (6),
The first liner is fixed to the outer lower half by a first mounting bolt,
The support arm is provided with a through hole along a central axis of the first mounting bolt in a region including the entire first mounting bolt in plan view,
The second liner is fixed to the support arm by a second mounting bolt provided at a position different from the first mounting bolt and the through hole in plan view.

  According to the configuration of (7), in a plan view, the first mounting bolt for fixing the first liner to the outer lower half portion, and the through-hole provided in the support arm at a position corresponding to the first mounting bolt. The position is shifted from the position of the second mounting bolt for fixing the second liner to the support arm. Therefore, in a state where the second liner is fixed to the support arm by the second mounting bolt, the work of tightening or removing the first mounting bolt for fixing the first liner through the through hole provided in the support arm is performed. It can be carried out. Thus, the first liner can be removed and attached while the inner upper half is assembled to the inner lower half, and the second liner is fixed to the support arm. Can be adjusted in thickness.

(8) In some embodiments, in any one of the above configurations (1) to (7),
The support arm and the alignment arm are provided adjacent to each other in the axial direction of the rotating machine,
One of the support arm or the alignment arm is provided at an axial end region (an end region in the axial direction of the rotary machine) on the other side of the support arm or the alignment arm. A concave surface that is separated from the other in the height direction.

  According to the above configuration (8), the above-described concave surface is formed on one of the support arm and the alignment arm provided adjacent to the rotating machine in the axial direction (hereinafter, also simply referred to as “axial direction”). For example, even if the support arm and the alignment arm partially overlap in the axial direction due to manufacturing tolerances, etc., even if there is a temperature difference in the horizontal direction on the support arm and the alignment arm during operation of the rotating machine, Thermal deformation of the component (the inner lower half and / or the inner upper half) can be suppressed.

(9) In some embodiments, in any of the above configurations (1) to (8), the rotating machine further includes a screw protection bolt that can be inserted into the bolt hole.

  According to the configuration (9), the screw protection bolt is provided in the bolt hole through which the jack bolt is inserted. Therefore, when the jack bolt is not used, such as during normal operation of the rotating machine, the screw protection is provided in the bolt hole. Bolts can be inserted. Accordingly, it is possible to prevent foreign matter such as scale from adhering or sticking to the bolt holes during operation of the rotary machine.

(10) In some embodiments, in any of the above configurations (1) to (9),
The outer upper half portion is located in a region directly above the support arm and faces the support arm, and a support arm facing surface is located in a region directly above the alignment arm and faces the alignment arm. And a centering arm facing surface,
The centering arm facing surface is located below the support arm facing surface.

  According to the above configuration (10), the centering arm facing surface of the outer upper half is closer to the centering arm than the supporting arm facing surface. Can play a role. That is, the thing (for example, the above-mentioned screw protection bolt or the like) inserted into the bolt hole provided in the alignment arm jumps out of the bolt hole during operation of the rotating machine due to the above-mentioned alignment arm facing surface. Can be prevented.

(11) A method for disassembling a rotating machine according to at least one embodiment of the present invention includes
An outer casing, including an internal part provided inside the outer casing, a method of disassembling a rotating machine in which the outer casing and the internal part are each vertically divided into two parts,
The outer casing includes an outer upper half and an outer lower half,
The internal component includes an inner upper half and an inner lower half,
The rotating machine includes:
A support arm provided to project horizontally from the inner upper half, and for supporting the internal component to the outer casing;
Alignment provided with a bolt hole that is provided to protrude horizontally from the inner lower half and through which a jack bolt for adjusting the height position of the inner lower half with respect to the outer lower half is inserted. Arm and
Further comprising a jack-up amount regulating portion fixed to the outer lower half,
In a state where the outer upper half is detached from the outer lower half, while regulating the jack-up amount by the jack-up amount regulating unit, the jack lower bolt is used to move the inner lower half to the outer lower half. Jacking up.

According to the above method (11), when the inner lower half is jacked up with respect to the outer lower half by the jack bolt, the jack-up amount of the inner lower half with respect to the outer lower half by the jack-up amount regulating portion. Therefore, when jacking up, the radial clearance between the rotor portion of the rotating machine and the stationary member (internal component) around the rotor portion can be appropriately maintained.
Therefore, according to the above method (11), when the inner lower half (internal component) is jacked up with respect to the outer lower half (outer casing), contact between the rotor portion and the stationary member is prevented. Can be.

  According to at least one embodiment of the present invention, there is provided a rotating machine and a method of disassembling a rotating machine capable of preventing contact between a rotor unit and a stationary member when the rotating machine is disassembled.

FIG. 1 is a schematic plan view illustrating a configuration of a steam turbine (rotary machine) according to an embodiment. FIG. 2 is a plan view including a partial cross section (a II-II cross section in FIG. 3) of a portion S illustrated in FIG. 1. FIG. 3 is a sectional view taken along line III-III of FIG. 2. FIG. 4 is a cross-sectional view taken along IVA-IVA and IVB-IVB of FIG. 2. FIG. 7 is a plan view of a portion S shown in FIG. 1 (a view taken along the line VV in FIG. 6). FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5 and is a diagram for explaining jack-up by a jack bolt. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, showing a state where the steam turbine is assembled.

  Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent.

  In the following embodiments, a steam turbine will be described as an example of a rotating machine according to the present invention. However, the present invention provides an arbitrary rotating member having a structure in which an internal component (an inner casing or the like) which is a stationary member is provided inside the outer casing and around the rotor portion, and the outer casing and the internal component are each vertically divided into two parts. It is applicable to machines, for example, to gas turbines.

  FIG. 1 is a schematic plan view showing the configuration of the steam turbine according to one embodiment. However, in FIG. 1, the illustration of the upper half (outer upper half) of the outer casing is omitted for convenience of explanation.

  As shown in FIG. 1, the steam turbine 1 includes an outer casing 2 and an internal component 4 provided inside the outer casing 2 and supported by the outer casing 2. The internal component 4 includes, for example, an inner casing and a stationary blade provided so as to surround a rotor shaft extending along the axial direction of the steam turbine 1 (the direction of the central axis O; hereinafter, also simply referred to as “axial direction”). It may be a blade ring for supporting.

  The outer casing 2 and the inner part 4 are vertically divided into two parts in a horizontal plane. The outer casing 2 includes an outer upper half 2A (not shown in FIG. 1) and an outer lower half 2B. It includes a half 4A and an inner lower half 4B (in FIG. 1, hidden behind the inner upper half 4A).

  Steam turbine 1 includes a support arm 6 provided to project horizontally from inner upper half 4A, and a centering arm 8 provided to project horizontally from inner lower half 4B. .

  2 to 4 are views showing the steam turbine 1 in a state where the outer upper half 2A of the outer casing 2 is attached (that is, a state in which the steam turbine 1 is assembled). FIG. 2 is a plan view including a partial cross section (II-II cross section in FIG. 3) of the portion S shown in FIG. 1, FIG. 3 is a III-III cross section in FIG. 2, and FIG. FIG. 4 is a cross-sectional view taken along IVA-IVA and IVB-IVB of FIG. 2. However, in FIG. 4, the upper half of the steam turbine 1 is a cross section taken along the line IVA-IVA of FIG. 2, and the lower half is a cross section taken along the line IVB-IVB of FIG. 2.

  FIGS. 5, 6A, and 6B are views showing the steam turbine 1 in a state where the outer upper half 2A of the outer casing 2 is removed. FIG. 5 is a plan view of the portion S shown in FIG. 1 (viewed along the arrow VV in FIG. 6), and FIGS. 6A and 6B are cross-sectional views taken along the line VI-VI in FIG. FIG. 6A is a diagram for explaining jack-up by a jack bolt. FIG. 6B is a diagram showing a state where the steam turbine 1 is assembled, and is a diagram showing a case where the jack-up amount is larger than the state shown in FIG. 6A.

As shown in FIGS. 2 to 4, the support arm 6 is provided so as to protrude away from the center axis O (see FIG. 1) in the horizontal direction from the inner upper half portion 4A.
As shown in FIG. 3, the support arm 6 is provided such that the lower surface 6a of the support arm 6 faces the upper end surface 2Ba (horizontal division surface) of the outer lower half 2B. 4 is supported by the outer casing 2.

As shown in FIG. 2 to FIG. 4 and FIG. 5 to FIG. 6, the alignment arm 8 is provided so as to protrude away from the center axis O (see FIG. 1) in the horizontal direction from the inner lower half 4 </ b> B. I have.
As shown in FIG. 3 and FIGS. 6A and 6B, the alignment arm 8 has a bottom surface 8a of which the lower surface 8a of the alignment arm 8 is provided below the upper end surface 2Ba (horizontal division surface) in the outer lower half 2B. 12 are provided. The centering arm 8 is formed with a bolt hole 16 through which a jack bolt 18 (see FIGS. 6A and 6B) for adjusting the height position of the inner lower half 4B with respect to the outer lower half 2B is inserted. I have. The bolt hole 16 is provided so as to penetrate the centering arm 8 in the vertical direction.

  The jack bolt 18 is a bolt for jacking up the inner lower half 4B with respect to the outer lower half 2B, and is used, for example, when assembling or disassembling the steam turbine 1. When the jack bolt 18 is not used (for example, during operation of the steam turbine 1), the jack bolt 18 may be removed from the bolt hole 16. In this case, the bolt hole 16 is provided with a screw protection described later in detail. The bolt 30 may be inserted.

  2 to 4, a screw protection bolt 30 described later is inserted into the bolt hole 16. 5 to 6B, the above-described jack bolt 18 is inserted into the bolt hole 16. A male screw is formed in the jack bolt 18 and the screw protection bolt 30, and can be screwed into the bolt hole 16.

As shown in FIGS. 6A and 6B, by adjusting the screwing amount of the jack bolt 18 into the bolt hole 16 formed in the alignment arm 8, the jack-up amount of the inner lower half 4B to the outer lower half 2B is reduced. By adjusting, the height position of the inner lower half 4B with respect to the outer lower half 2B can be adjusted.
That is, as shown in FIG. 6A, when the tip of the jack bolt 18 is located at the same level or higher than the lower surface 8a of the alignment arm 8, the lower surface 8a of the alignment arm 8 It will be in contact.
Further, in the state shown in FIG. 6B, the screwing amount of the jack bolt 18 is increased compared to the state shown in FIG. 6A, and the inner lower half 4B is jacked up with respect to the outer lower half 2B. That is, in the state shown in FIG. 6B, the jack-up amount is larger than in the state shown in FIG. 6A. At this time, the tip of the jack bolt 18 is located below the lower surface 8 a of the alignment arm 8 and is in contact with the bottom surface 12.

  The outline of the procedure for adjusting the centering of the internal component and the outer casing (level adjustment in the horizontal plane) using the jack bolts 18 at the time of assembling the steam turbine is as follows.

First, the inner lower half 4B is assembled into the outer lower half 2B with the jack bolt 18 inserted through the alignment arm 8 of the inner lower half 4B. At this time, the tip of the jack bolt 18 is set to slightly project below the lower surface 8a of the alignment arm 8.
Next, the inner lower half part 4B is jacked up with respect to the outer lower half part 2B by the jack bolt 18, and the height position of the horizontal division surface of the inner lower half part 4B and the outer lower half part 2B is adjusted. As a result, the two internal components including the inner lower half 4B and the outer casing 2 including the outer lower half 2B are aligned.

  As will be described in detail later, when the inner upper half 4A is detached from the lower lower half 4B when the steam turbine 1 is disassembled, the jack bolts 18 are used to remove the internal components 4 (the inner upper half 4A and the lower lower half 4A). 4B) is also used to support the load (self-weight) of 4B) by the alignment arm 8 (the inner lower half 4B).

  FIG. 6A is a diagram for explaining the jack-up of the inner lower half 4B with respect to the outer lower half 2B together with FIG. 6B. In practice, usually, as shown in FIG. The lower surface 8a does not come into contact with the outer lower half 2B bottom surface 12. Actually, when the jack bolt 18 is used, including during assembly and disassembly of the steam turbine 1, the tip of the jack bolt 18 slightly protrudes below the lower surface 8 a of the alignment arm 8.

  In some embodiments, the steam turbine 1 is fixed to the outer lower half 2B and regulates the above-described jack-up amount (ie, the amount of jack-up of the inner lower half 4B with respect to the outer lower half 2B). A jack-up amount regulating unit 10 is provided.

  In the illustrated embodiment, for example, as shown in FIGS. 6A and 6B, the first liner 20 provided between the outer lower half 2 </ b> B and the support arm 6 in the up-down direction forms the jack-up amount regulating unit 10. I have.

  The first liner 20 is fixed to the outer lower half 2B so as to at least partially overlap the alignment arm 8 in a plan view. That is, the first liner 20 has a surface 21 a (the lower surface of a step portion 21 described below) facing the bottom surface 12 of the outer lower half 2 </ b> B, and the alignment arm 8 is arranged in the axial direction (Referred to simply as “axial direction”) at least partially between the surface 21 a of the first liner 20 and the bottom surface 12 of the outer lower half 2 </ b> B.

  Further, the first liner 20 is fixed to the outer lower half 2 </ b> B by the first mounting bolts 22. The first mounting bolt 22 is adapted to be screwed into a bolt hole provided in the upper end surface 2Ba of the outer lower half 2B.

As described below, the amount of jack-up of the inner lower half 4B with respect to the outer lower half 2B is restricted by the first liner 20 described above.
That is, as the screwing amount of the jack bolt 18 into the bolt hole 16 is increased, the centering arm 8 gradually rises with respect to the outer lower half 2B. The jack-up can be performed until the upper surface 8b of the alignment arm 8 comes into contact with the surface 21a of the first liner 20, but since the upward movement of the alignment arm 8 is restricted by the first liner 20, The amount of jack-up does not increase any further.

  As described above, in the steam turbine 1, by providing the above-described jack-up amount regulating portion 10 (the first liner 20 in the illustrated embodiment), the jack of the inner lower half 4 </ b> B with respect to the outer lower half 2 </ b> B by the jack bolt 18. The up amount is regulated, that is, the relative uppermost position of the inner lower half 4B with respect to the outer lower half 2B is restricted. Accordingly, when the inner lower half (internal component) is jacked up with respect to the outer lower half using the jack bolt 18, the rotor portion including the turbine rotor blade and the stationary member (internal component) around the rotor portion are used. ) Can be appropriately maintained in the radial direction. Therefore, at the time of jacking up by the jack bolt 18, contact between the rotor portion and the stationary member can be prevented.

In some embodiments, the distance L2 (see FIG. 6B) between the jack-up amount regulating unit 10 and the alignment arm 8 in the up-down direction in a state where the steam turbine 1 is assembled is equal to the lowermost portion of the steam turbine 1. Is set smaller than the radial clearance between the rotor blades of the steam turbine 1 and the stationary member. That is, the thickness of the first liner 20, particularly the height of the stepped portion 21 having the surface 21 a facing the alignment arm 8, is set such that the distance L 2 is smaller than the clearance in a state where the steam turbine 1 is assembled. The thickness is adjusted.
The radial clearance between the moving blade and the stationary member refers to a radial distance between a tip of the moving blade and a stationary member (such as an inner casing) facing the leading end.

  In some embodiments, the above-described distance L2 in a state where the steam turbine 1 is assembled may be set to be smaller than the minimum radial clearance between the moving blades of the steam turbine 1 and the stationary member.

  The distance L2 between the jack-up amount regulating unit 10 and the alignment arm 8 in the vertical direction in a state where the steam turbine 1 is assembled may be, for example, 1 mm or less.

As the jack-up amount by the jack bolt 18 increases, the inner lower half 4B rises with respect to the outer lower half 2B and the rotor, and the radial direction between the rotor and the stationary part at the lowermost part of the steam turbine 1 is increased. Clearance is reduced.
In this regard, in the above-described embodiment, the distance between the jack-up amount regulating unit 10 (for example, the first liner 20) and the alignment arm 8 in the vertical direction is determined by the radial clearance between the rotor blade and the stationary member. Is set to be small, the jack-up amount is maximized, and even if the distance between the jack-up amount regulating unit 10 (for example, the first liner 20) and the alignment arm 8 becomes zero, the above-mentioned clearance is set. Can be reliably maintained. Therefore, when assembling or disassembling the steam turbine 1, contact between the rotor portion and the stationary member can be more reliably prevented.

  As shown in FIG. 5 and FIGS. 6A and 6B, a female screw 32 may be formed on a side surface of the first liner 20. In the illustrated embodiment, a bolt hole into which a detachable bolt can be inserted is formed along the axial direction, and a female screw 32 is formed in the bolt hole.

  In this manner, by forming the female screw 32 on the side surface of the first liner 20, the detachable bolt is screwed into the female screw 32, and the first liner 20 is moved in the horizontal direction (preferably in the axial direction of the steam turbine 1) together with the detachable bolt. ), The first liner 20 can be attached and detached. Thereby, for example, the thickness adjustment of the first liner 20 can be performed in a state where the inner upper half portion 4A is still assembled to the inner lower half portion 4B.

  The first liner 20 may have a hook-shaped stepped portion 21. The step portion 21 is provided so as to project below the upper end surface 2Ba of the outer lower half portion 2B in the vertical direction. Since the first liner 20 has the stepped portion 21, the movement of the first liner 20 in the axial direction of the steam turbine 1 (from left to right in FIG. 3) is restricted. 6 and the outer lower half 2B.

  As shown in FIGS. 3 and 6A and 6B, a second liner 24 may be provided between the support arm 6 and the outer upper half 2A in the vertical direction.

  Depending on the operating conditions of the steam turbine 1, an upward load may act on internal components (the inner casing and the like). For example, an upward force may act on the internal component 4 due to steam flowing from a nozzle provided in the inner lower half portion 4B. In the above-described embodiment, as described above, since the second liner is interposed between the support arm 6 protruding from the internal component 4 and the outer upper half 2A, the movable space of the internal component 4 in the vertical direction is reduced. Reduced. Therefore, the floating of the internal component 4 with respect to the outer casing 2 can be suppressed.

  In the illustrated embodiment, the second liner 24 is fixed to the support arm 6 by second mounting bolts 26, but in other embodiments, the second liner 24 is fixed to the outer upper half 2A by bolts or the like. It may be.

When the second liner 24 is fixed to the support arm 6, by appropriately setting the size of the gap L3 in the vertical direction between the second liner 24 and the outer upper half 2A, the internal components for the outer casing 2 are set. 4 can be effectively suppressed from rising.
In addition, since the thickness of the second liner 24 can be easily changed, the size of the gap L3 can be easily managed.

  For example, a gap L3 in the vertical direction between the second liner 24 and the outer upper half 2A is set smaller than a distance L2 between the alignment arm 8 and the surface 21a of the first liner. This makes it possible to reduce the amount of rise when the internal component 4 is going to rise with respect to the outer casing 2 during operation of the steam turbine, and to effectively suppress the floating of the internal component 4 with respect to the outer casing 2. it can.

  As shown in FIGS. 2 and 3 and FIGS. 6A and 6B, the support arm 6 has a through hole 28 along the central axis of the first mounting bolt 22 in a region including the entire first mounting bolt 22 in plan view. Is provided. The through-hole 28 has a diameter larger than the maximum diameter of the first mounting bolt 22, and has a size through which the first mounting bolt 22 can pass.

Further, as shown in FIGS. 2 and 3 and FIGS. 6A and 6B, the second liner 24 is fixed to the support arm 6 by a second mounting bolt. The second mounting bolt is provided at a position different from the first mounting bolt 22 and the through hole 28 in a plan view.
In the second liner 24, a through hole 34 is provided along a central axis of the first mounting bolt 22 in a region including the entire first mounting bolt 22 in plan view. The through hole 34 of the second liner 24 has the same central axis as the through hole 28 of the support arm 6, and is provided so as to be continuous with the through hole 28. It can pass through the hole 34.

  As described above, since the through-hole 28 is provided in the support arm 6, it is possible to perform an operation of tightening or removing the first mounting bolt 22 for fixing the first liner 20 through the through-hole 28, Therefore, the first liner 20 can be removed and attached while the inner upper half 4A is assembled to the inner lower half 4B. Thereby, for example, the thickness adjustment of the first liner 20 can be performed in a state where the inner upper half portion 4A is still assembled to the inner lower half portion 4B.

  Further, as described above, in plan view, the position of the first mounting bolt 22 for fixing the first liner 20 to the outer lower half 2B and the position of the second mounting bolt 26 for fixing the second liner 24 to the support arm 6 are described. Since the position is shifted and the above-mentioned through hole 34 is provided in the second liner, the second liner 24 is fixed to the support arm 6 by the second mounting bolt 26, through the through hole 28 and the through hole 34. Thus, an operation of tightening or removing the first mounting bolt 22 for fixing the first liner 20 can be performed. Thereby, while the inner upper half 4A is assembled to the inner lower half 4B, the first liner 20 can be removed and attached while the second liner 24 remains fixed to the support arm 6, That is, the thickness of the first liner 20 can be adjusted.

  The steam turbine 1 may further include a screw protection bolt 30 that can be inserted into the bolt hole 16. 2 to 4, a screw protection bolt 30 is provided in the bolt hole 16.

  The screw protection bolt 30 is inserted into the bolt hole 16 to protect the bolt hole 16 when the jack bolt 18 is not used. For example, after the height adjustment of the inner lower half with respect to the outer lower half by the jack bolt 18 is completed, the jack bolt 18 is removed from the bolt hole 16, and the screw protection bolt 30 is inserted into the bolt hole 16.

  The screw protection bolt 30 may have a screw that can be screwed into the bolt hole 16. In this case, the screw protection bolt 30 may be capable of being screwed into the bolt hole 16 more loosely than the jack bolt 18 in order to prevent sticking or the like.

  As described above, by using the screw protection bolt 30 that can be inserted into the bolt hole 16 for the jack bolt 18, it is possible to prevent foreign matter such as scale from adhering or sticking to the bolt hole 16 during operation of the steam turbine 1. be able to.

  As shown in FIG. 3, the outer upper half 2 </ b> A is located in a region directly above the support arm 6 and faces the support arm 6, and is located in a region just above the alignment arm 8. And a centering arm facing surface 38 facing the centering arm 8. The alignment arm facing surface 38 is located below the support arm facing surface 36.

  As described above, since the alignment arm facing surface 38 of the outer upper half 2A is closer to the alignment arm 8 than the support arm facing surface 36, the alignment arm facing surface 38 serves as a lid for the bolt hole 16. . That is, the bolt or the like (for example, the above-described screw protection bolt 30 or the like) inserted into the bolt hole 16 provided in the alignment arm 8 by the alignment arm facing surface 38 during the operation of the steam turbine 1. It is possible to prevent jumping out from the bolt hole.

In the assembled state of the steam turbine 1, the vertical distance between the alignment arm facing surface 38 of the outer upper half 2 </ b> A and the alignment arm 8 is equal to the length of the screw protection bolt 30 inserted into the bolt hole 16. Or less than the vertical length of the alignment arm 8.
In this case, the vertical dimension of the space formed between the alignment arm facing surface 38 and the alignment arm 8 is smaller than the length of the screw protection bolt 30 or the vertical length of the alignment arm 8. Therefore, it is possible to more reliably prevent the screw protection bolt 30 from jumping out of the bolt hole 16 during operation of the steam turbine 1.

  In some embodiments, for example, as shown in FIG. 3 and the like, the support arm 6 and the alignment arm 8 are provided adjacent to each other in the axial direction of the steam turbine 1. A concave surface 40 is formed on one of the support arm 6 and the alignment arm 8 so as to be separated from the other of the support arm 6 and the alignment arm 8 in the height direction. The concave surface 40 is formed in the axial end region on the other side of the support arm 6 or the alignment arm 8.

  In the illustrated embodiment, as shown in FIGS. 4, 2, and 5, the above-described concave surface 40 is provided in an end region of the alignment arm 8 on the side closer to the support arm 6 in the axial direction. , And are formed apart from the support arm 6 in the height direction.

During operation of the steam turbine 1, there is also a temperature difference depending on the location of the casing, for example, the temperature is relatively high in the center portion and relatively low in the outer peripheral portion. Due to such a temperature difference, for example, deformation (stretching) of the inner casing (internal component) may occur. Such tension deformation may be greatly deformed when the upper half and the lower half are in contact with each other in the vertical direction.
In this regard, in the above-described embodiment, the concave surface 40 is formed on one of the support arm 6 and the alignment arm 8 provided adjacent to each other in the axial direction. Even if they partially overlap in the axial direction, and even if a temperature difference occurs in the horizontal direction on the support arm 6 and the alignment arm 8 during operation of the steam turbine 1, the internal components (the inner lower half 4B And / or thermal deformation of the inner upper half 4A) can be suppressed.

The steam turbine 1 described above may be disassembled during maintenance or the like, and during disassembly, the internal component 4 may be jacked up with respect to the outer lower half 2B (outer casing 2).
Hereinafter, an example of a method of disassembling the steam turbine 1 including the above-described jack-up will be described.

  Before the steam turbine 1 is disassembled, the steam turbine 1 is in an assembled state and in a stopped state. At this time, a screw protection bolt 30 is installed in the bolt hole 16 of the alignment arm 8 (see FIGS. 3 and 4).

  When disassembling the steam turbine 1, first, the outer casing 2 is disassembled. That is, after removing the bolt (not shown) that fastens the outer upper half 2A and the outer lower half 2B, the outer upper half 2A is removed from the outer lower half 2B.

In this state, the load (self-weight) of the internal component 4 (the inner upper half 4A and the inner lower half 4B) is fixed to the floor or the like via the support arm 6 which projects horizontally from the inner upper half 4A. Is transmitted to the outer lower half 2B. That is, the load of the internal component 4 is supported by the support arm 6. Also, as shown in FIGS. 3 and 4, the lower surface 8a of the alignment arm 8 and the bottom surface 12 of the outer lower half 2B are vertically separated from each other.
At this time, the first liner 20 and the second liner 24 are fixed to the lower lower half 2B and the support arm 6, respectively. Further, by removing the outer upper half 2A, the upper part of the bolt hole 16 provided in the alignment arm 8 is opened, and the bolt hole 16 can be accessed.

  Next, the screw protection bolt 30 is removed from the bolt hole 16, and the jack bolt 18 is attached to the bolt hole 16. At this time, the tip of the jack bolt 18 is slightly protruded from the lower surface 8a of the alignment arm 8. The tip of the jack bolt 18 may be in a state of lightly contacting the bottom surface 12 of the outer lower half 2B.

  Then, the jack bolt 18 is inserted into the bolt hole 16 in a state where the jack-up amount of the inner lower half 4B (the internal component 4) with respect to the outer lower half 2B is regulated by the first liner 20 (the jack-up amount regulating unit 10). , The inner part 4 is jacked up to the outer lower half 2B. As a result, the load of the internal component 4 is supported by the centering arm 8 (the inner lower half portion 4B) via the jack bolt 18.

  Next, the internal component 4 is disassembled. That is, after removing the bolt (not shown) that fastens the inner upper half 4A and the inner lower half 4B, the inner upper half 4A is removed from the inner lower half 4B.

  In this manner, the outer casing 2 and the upper half of the internal component 4 are removed, and the turbine rotor and the like can be accessed.

  In the disassembly method described above, when the internal component 4 is jacked up with respect to the outer lower half 2B, the first liner 20 (jack-up amount regulating unit 10) lowers the inner lower half 4B (internal component 4). Since the jack-up amount with respect to the half part 2B is regulated, the radial clearance between the rotor part of the steam turbine 1 and the internal component 4 around the rotor part can be appropriately maintained. Thereby, contact between the rotor part and the internal component 4 at the time of jacking up can be prevented.

  In the case of a typical steam turbine, when disassembling the steam turbine, when the outer upper half 2A is lifted to remove the outer upper half 2A from the outer lower half 2B, the outer upper half 2A is fitted to the outer upper half 2A. The internal components 4 (the inner upper half 4A and / or the inner lower half 4B) may be lifted together with the outer upper half 2A due to scale fixation or the like. Then, the internal component 4 may come into contact with the rotor.

In this regard, in the steam turbine 1 according to the above-described embodiment, the first liner 20 is fixed to the outer lower half 2B so as to partially overlap the alignment arm 8 in a plan view. , In the axial direction, it is sandwiched between the surface 21a of the first liner 20 and the bottom surface 12 of the outer lower half 2B.
Therefore, when disassembling the steam turbine 1, when the outer upper half 2A is detached from the outer lower half 2B and lifted, even if the internal component 4 is fitted to the outer upper half 2A, the internal component 4 is adjusted. It is pressed by the first liner 20 via the core arm 8 so as not to be lifted. In this manner, lifting of the internal component 4 during disassembly can be suppressed, and contact between the rotor and the internal component 4 during disassembly of the steam turbine 1 can be prevented.

  Next, an example of a method of assembling the steam turbine 1 including adjusting the thickness of the first liner 20 (jack-up amount regulating unit 10) and the second liner 24 will be described.

  First, the inner lower half 4B is assembled into the outer lower half 2B with the jack bolt 18 inserted through the bolt hole 16 of the alignment arm 8 of the inner lower half 4B. At this time, the tip of the jack bolt 18 is made to slightly protrude from the lower surface 8a of the alignment arm 8.

  Next, by adjusting the screwing amount of the jack bolt 18 into the bolt hole 16, the vertical position of the inner lower half 4B with respect to the outer lower half 2B is adjusted, and the inner lower half 4B and the outer lower half 2B are adjusted. Adjust the height of the horizontal division plane.

  When the above centering adjustment is completed, the inner upper half 4A is temporarily fixed to the inner lower half 4B. That is, the inner upper half 4A is incorporated into the inner lower half 4B, and the inner lower half 4B and the inner upper half 4A are connected by bolts (not shown).

  Next, the radial clearance between the rotor part and the internal component 4 (the radial clearance between the tip of the moving blade and the internal component 4) is measured. Here, the radial clearance at the uppermost position and the lowermost position (positions at 6 o'clock and 12 o'clock) in the cross section orthogonal to the axial direction of the steam turbine 1 is mainly measured. Also, confirm that the measurement results are within the planned range.

Next, the thickness (the size in the vertical direction) of the first liner 20 and the second liner 24 is determined based on the result of checking the radial clearance described above.
The thickness of the portion of the first liner 20 sandwiched between the support arm 6 and the lower lower half 2B, and the thickness of the second liner 24 (the thickness of the portion sandwiched between the support arm 6 and the upper lower half 2A) Thickness) is set to a thickness at which the confirmed radial clearance can be maintained after the assembly of the steam turbine 1 is completed.
Note that the thickness of the first liner 20 (the thickness of the portion sandwiched between the support arm 6 and the lower lower half 2B) is equal to the upper end surface 2Bb of the outer lower half 2B in the centered state. The distance from the lower surface of the arm 6 may be measured, and the distance may be determined based on the measurement result.

  Further, the thickness of the step portion 21 having the surface 21a facing the upper surface 8b of the alignment arm 8 in the first liner 20 is also determined. At this time, the vertical distance L2 between the upper surface 8b of the alignment arm 8 and the surface 21a of the step portion 21 (that is, the distance L2 after the assembly is completed; see FIG. The clearance may be set to be smaller than the clearance in the direction or the minimum radial clearance of the steam turbine 1.

  Next, the bolt temporarily fixing the inner upper half 4A to the inner lower half 4B is removed, and the inner upper half 4A is temporarily removed from the inner lower half 4B. Then, the first liner 20 having the thickness determined as described above is attached to the outer lower half 2B with the first attachment bolt 22.

Next, the internal parts 4 are assembled. That is, the inner upper half 4A is incorporated into the inner lower half 4B, and the inner lower half 4B and the inner upper half 4A are fastened with bolts (not shown).
Then, the jack bolt 18 is removed from the bolt hole 16 of the alignment arm 8, and the screw protection bolt 30 is attached to the bolt hole 16.

Next, the second liner 24 having the thickness determined as described above is attached to the support arm 6 using the second attachment bolt 26.
Then, the outer upper half 2A is assembled into the outer lower half 2B, and the outer lower half 2B and the outer upper half 2A are fastened with bolts (not shown).
The steam turbine 1 is assembled as described above.

In the above-described steam turbine 1, the support arm 6 and the second liner 24 located above the first liner 20 correspond to the first mounting bolts for fixing the first liner 20 to the outer lower half 2B in plan view. Are provided with through holes 28 and 34 through which the first mounting bolt can pass.
Therefore, during the assembling work of the steam turbine 1, the first mounting bolt 22 is inserted through the through holes 28 and 34 while the inner upper half 2A including the support arm 6 is assembled to the inner lower half 2B. The first liner can be attached and detached, and the thickness of the first liner can be adjusted.

  Further, in the above-described steam turbine 1, since the female screw 32 is formed on the side surface of the first liner 20, a detachable bolt (not shown) is screwed into the female screw 32, and the first liner 20 is attached together with the detachable bolt. By inserting and removing in the horizontal direction, the first liner 20 can be attached and detached. Thus, during the assembly work of the steam turbine 1, it is easy to adjust the thickness of the first liner 20 while the inner upper half 2A including the support arm 6 is assembled to the inner lower half 2B. Becomes

  As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above-described embodiments, and includes a form in which the above-described embodiments are modified and a form in which these forms are appropriately combined.

In this specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial". Represents not only such an arrangement strictly, but also represents a state of being relatively displaced with a tolerance or an angle or a distance to obtain the same function.
For example, expressions such as "identical", "equal", and "homogeneous", which indicate that things are in the same state, not only represent strictly equal states, but also have a tolerance or a difference that provides the same function. An existing state shall also be represented.
Further, in the present specification, the expression representing a shape such as a square shape or a cylindrical shape not only indicates a shape such as a square shape or a cylindrical shape in a strict sense geometrically, but also within a range where the same effect can be obtained. , And a shape including an uneven portion and a chamfered portion.
Further, in this specification, the expression “comprising”, “including”, or “having” one component is not an exclusive expression excluding the existence of another component.

DESCRIPTION OF SYMBOLS 1 Steam turbine 2 Outer casing 2A Outer upper half 2B Outer lower half 2Ba Upper end surface 4 Internal component 4A Inner upper half 4B Inner lower half 6 Support arm 6a Lower surface 8 Alignment arm 8a Lower surface 8b Upper surface 10 Jack-up amount regulation Part 12 Bottom 16 Bolt hole 18 Jack bolt 20 First liner 21 Step 21a Surface 22 First mounting bolt 24 Second liner 26 Second mounting bolt 28 Through hole 30 Screw protection bolt 32 Female screw 34 Through hole 36 Support arm facing surface 38 Alignment arm facing surface 40 Concave surface

Claims (11)

An outer casing, comprising: an inner part supported by the outer casing inside the outer casing, a rotating machine in which the outer casing and the inner part are each vertically divided into two parts,
The outer casing includes an outer upper half and an outer lower half,
The internal component includes an inner upper half and an inner lower half,
A support arm provided to project horizontally from the inner upper half, and for supporting the internal component to the outer casing;
Alignment provided with a bolt hole that is provided to protrude horizontally from the inner lower half and through which a jack bolt for adjusting the height position of the inner lower half with respect to the outer lower half is inserted. Arm and
A rotating machine further comprising: a jack-up amount regulating unit fixed to the outer lower half, and configured to regulate a jack-up amount of the inner lower half with respect to the outer lower half by the jack bolt. . In a state where the rotating machine is assembled, a distance between the jack-up amount regulating portion and the alignment arm in the up-down direction is greater than a distance between a rotor portion of the rotating machine and a stationary member at a lowermost portion of the rotating machine. The rotating machine according to claim 1, wherein the clearance is smaller than a radial clearance of the rotating machine. A first liner provided at least partially between the outer lower half and the support arm in a vertical direction,
The said 1st liner is being fixed to the said outer lower half part so that it may overlap with the said centering arm at least partially in planar view, and forms the said jack-up amount control part, The said 1st or 2nd characterized by the above-mentioned. The rotating machine as described. The first liner is fixed to the outer lower half by a first mounting bolt,
4. The rotation according to claim 3, wherein the support arm is provided with a through hole along a central axis of the first mounting bolt in a region including the entirety of the first mounting bolt in plan view. 5. machine. The rotating machine according to claim 3, wherein a female screw is formed on a side surface of the first liner. The rotary machine according to any one of claims 3 to 5, further comprising a second liner provided at least partially between the support arm and the outer upper half in a vertical direction. The first liner is fixed to the outer lower half by a first mounting bolt,
The support arm is provided with a through hole along a central axis of the first mounting bolt in a region including the entire first mounting bolt in plan view,
The rotation according to claim 6, wherein the second liner is fixed to the support arm by a second mounting bolt provided at a position different from the first mounting bolt and the through hole in a plan view. machine. The support arm and the alignment arm are provided adjacent to each other in the axial direction of the rotating machine,
One of the support arm or the centering arm has an axial end region on the other side of the support arm or the centering arm, and has a concave surface separated in a height direction from the other of the support arm or the centering arm. The rotating machine according to any one of claims 1 to 7, wherein the rotating machine is formed. The rotating machine according to claim 1, further comprising a screw protection bolt that can be inserted into the bolt hole. The outer upper half portion is located in a region directly above the support arm and faces the support arm, and a support arm facing surface is located in a region directly above the alignment arm and faces the alignment arm. And a centering arm facing surface,
The rotating machine according to any one of claims 1 to 9, wherein the centering arm facing surface is located lower than the support arm facing surface. An outer casing, including an internal part provided inside the outer casing, a method of disassembling a rotating machine in which the outer casing and the internal part are each vertically divided into two parts,
The outer casing includes an outer upper half and an outer lower half,
The internal component includes an inner upper half and an inner lower half,
The rotating machine includes:
A support arm provided to project horizontally from the inner upper half, and for supporting the internal component to the outer casing;
Alignment provided with a bolt hole that is provided to protrude horizontally from the inner lower half and through which a jack bolt for adjusting the height position of the inner lower half with respect to the outer lower half is inserted. Arm and
Further comprising a jack-up amount regulating portion fixed to the outer lower half,
In a state where the outer upper half is detached from the outer lower half, while regulating the jack-up amount by the jack-up amount regulating unit, the jack lower bolt is used to move the inner lower half to the outer lower half. A method for disassembling a rotating machine, comprising a step of jacking up a rotary machine.

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