JP2014141922A - Position adjusting mechanism and steam turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable suitable correction of a shift in relative position between casings and a rotor.SOLUTION: A position adjusting mechanism is for a steam turbine comprising the rotor and a plurality of turbines which each have rotor blades fixed to the rotor, the inner casing arranged facing the rotor blades and having stator blades fixed to the inner surface, and the outer casing arranged around the inner casing. The position adjusting mechanism comprises: a plurality of arms connected to the respective inner casings of the plurality of turbines; a shaft formed with a plurality of screw grooves, in which the plurality of arms are fitted in the respective screw grooves; and a drive source rotating the shaft to move the plurality of arms fitted in the screw grooves in the axial direction of the rotor. The shaft is rotated by the drive source, the plurality of arms are moved in the axial direction, and relative positions between the plurality of rotor blades and the inner casings in the axial direction of the rotor are moved interlockingly.

Description

  The present invention relates to a position adjustment mechanism for a steam turbine in which a plurality of turbines that rotationally drive a rotor using steam are connected in series.

  In general steam turbines, an inner casing is provided in the outer casing, a steam inlet is provided in the upper part, a rotor is rotatably supported in the center, and a plurality of blades are fixed to the rotor in multiple stages. On the other hand, the stationary blades are fixed in multiple stages to the blade ring that is supported in the internal casing, and the multistage moving blades and stationary blades are alternately arranged. When the steam enters the internal casing from the steam inlet, the steam turbine is supplied to the multistage stationary blades and the moving blades, thereby rotating the rotor via the multistage moving blades.

  Here, in the steam turbine, high-temperature steam flows in a space between the inner casing and the rotor, that is, a space in which multistage moving blades and stationary blades are alternately arranged. Therefore, each part of the steam turbine is gradually heated from the start of steam supply (starting up), and the temperature rises. As the temperature of the steam turbine rises, each part expands, but there is a difference in elongation between the rotor and the internal casing, and a relative position shift occurs.

  On the other hand, for example, in Patent Document 1, in a steam turbine facility including an ultra-high-pressure high-temperature turbine and an ultra-high-pressure turbine, a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, Describes providing an elongation difference reducing device that reduces an elongation difference between the rotating portion and the stationary portion. As the differential elongation reducing device, there is described a shaft coupling device and a stationary part moving device that moves the casing (casing) of the ultra-high-pressure and high-temperature turbine, which is disposed in the rotor between the ultra-high-pressure and high-temperature turbine and absorbs the axial displacement. Has been.

JP 2000-282807 A

  In the steam turbine described in Patent Document 1 described above, the difference in relative position between the rotating part (rotor and moving blade) and the stationary part (inner casing and stationary blade) is suppressed by providing an elongation difference reducing device. Yes. However, in the elongation difference reducing device, there are cases where the reduction of the relative position deviation is insufficient. Moreover, in the steam turbine described in Patent Document 1, the difference in elongation between the rotating part and the stationary part between the ultra-high pressure and high-temperature turbine and the ultra-high pressure turbine is reduced. Problems may arise.

  The present invention solves the above-described problems, and an object of the present invention is to provide a position adjusting mechanism and a steam turbine that can appropriately correct a shift in the relative position between the passenger compartment and the rotor.

  In order to achieve the above object, a position adjusting mechanism of the present invention includes a rotor, a moving blade fixed to the rotor, an inner casing in which a stationary blade is fixed to an inner surface, which is arranged to face the moving blade, and A steam turbine position adjusting mechanism having a plurality of turbines, and a plurality of turbines having an outer casing disposed on an outer periphery of the inner casing, and a plurality of turbine turbines connected to each of the inner casings of the plurality of turbines An arm, a shaft in which a plurality of screw grooves are formed, and a plurality of the arms fitted in each of the screw grooves, and a plurality of the arms fitted in the screw grooves by rotating the shaft. A drive source that moves in the axial direction of the rotor, the shaft is rotated by the drive source, the plurality of arms are moved in the axial direction, and the plurality of moving blades and the inner casing are Rotor Wherein the moving in conjunction with the relative position in the direction.

  The position adjustment mechanism configured as described above can integrally adjust the relative positions of the casings and rotors of the plurality of turbines. Thereby, the shift | offset | difference of the relative position of a vehicle interior and a rotor can be correct | amended suitably.

  Here, the pitch of the shaft is preferably different depending on the position where the plurality of screw grooves are formed.

  In addition, the drive source is disposed at an end portion on the side where the axial position of the rotor is fixed with respect to the plurality of turbines, and the shaft is located in the direction of the screw groove far from the drive source. However, it is preferable that the pitch is larger than that of the screw groove close to the drive source.

  Moreover, it is preferable that the arm has an end on the shaft side branched into a plurality of portions, and the branched portions are respectively connected to the shaft.

  Moreover, it is preferable that a plurality of the arms are provided for one internal compartment.

  The shaft is provided with a universal joint in at least one of a position between the turbine and another turbine and a position between the turbine and the actuator in the axial direction. It is preferable.

  Further, in the axial direction, the shaft arranged in at least one of a position between the turbine and another turbine and a position between the turbine and the actuator can be moved in the axial direction. In this state, it is preferable to further include a bearing that regulates the position in the planar direction orthogonal to the axial direction.

  Moreover, it is preferable that the said arm has a guide mechanism which reduces the resistance at the time of the movement to the said axial direction in a contact part with the said external compartment.

  The arm may pass through the external compartment, at least a part of the arm may be disposed outside the external compartment, and the shaft may be fitted to a portion of the arm outside the external compartment. preferable.

  Moreover, it is preferable that the said arm is provided with the moving mechanism which assists the movement of the planar direction orthogonal to the said axial direction with respect to the said external compartment.

  In order to achieve the above object, a steam turbine according to the present invention includes the position adjusting mechanism according to any one of the above, the rotor, and the plurality of turbines.

  Here, it is preferable that the plurality of turbines include low-pressure turbines.

  According to the position adjusting mechanism and the steam turbine of the present invention, since the relative positions of the casings and the rotors of the plurality of turbines can be adjusted integrally, the displacement of the relative positions of the casings and the rotors is preferably corrected. be able to.

FIG. 1 is a top view showing a schematic configuration of a power generation system having a steam turbine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a low-pressure turbine of a steam turbine according to an embodiment of the present invention. 3 is a cross-sectional view of the low-pressure turbine shown in FIG. 2 cut along a horizontal plane. FIG. 4 is a cross-sectional view illustrating a low-pressure turbine of a steam turbine according to another embodiment. FIG. 5 is a partial side view of the turbine shown in FIG. 4. FIG. 6 is a cross-sectional view illustrating a low pressure turbine of a steam turbine according to another embodiment. FIG. 7 is a top view showing a schematic configuration of a power generation system having a steam turbine according to another embodiment. 8 is a cross-sectional view taken along line AA in FIG. FIG. 9 is a cross-sectional view of a low-pressure turbine according to another embodiment cut along a horizontal plane. FIG. 10 is a top view showing a schematic configuration of a power generation system having a steam turbine according to another embodiment. FIG. 11 is a cross-sectional view illustrating a low pressure turbine of a steam turbine according to another embodiment. 12 is a side view showing a schematic configuration of the arm shown in FIG. FIG. 13 is a perspective view showing a schematic configuration of the arm shown in FIG.

  Exemplary embodiments of a position adjusting mechanism and a steam turbine according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a top view showing a schematic configuration of a power generation system having a steam turbine according to an embodiment of the present invention. A power generation system 1 illustrated in FIG. 1 includes a generator 8 and a steam turbine 10. In the power generation system 1, the rotor 22 of the steam turbine 10 is connected to the generator 8. Thereby, in the power generation system 1, when the steam turbine 10 rotates the rotor 22, the rotor of the generator 8 is rotated, and the generator 8 generates power. Here, in the present embodiment, the axial direction of the rotor 22 is the X-axis direction, the direction orthogonal to the axial direction of the rotor 22 and parallel to the support surface of the power generation system is the Y-axis direction, and the direction perpendicular to the power generation system is Z. Axial direction.

  The steam turbine 10 includes a medium to high pressure turbine 12, a low pressure turbine 14, a low pressure turbine 16, a low pressure turbine 18, a rotor 22, a position adjustment mechanism 24, a relative position detection sensor 26, and a control device 28. . In the steam turbine 10, a medium-high pressure turbine 12, a low-pressure turbine 14, a low-pressure turbine 16, and a low-pressure turbine 18 are connected by a rotor 22. Further, the rotor 22 is supported in a freely rotatable state by a bearing 23 disposed between the medium-high pressure turbine 12 and the low-pressure turbine 14. The bearing 23 supports the part in which the rotor 22 is fitted in a state in which it cannot move in the X direction. Thereby, when the rotor 22 extends due to heat or the like, the rotor 22 extends from the bearing 23 as a starting point.

  The medium / high pressure turbine 12 includes a plurality of moving blades connected to the rotor 22, an inner casing disposed on the outer periphery of the moving blades and a plurality of stationary blades disposed therein, and an external vehicle disposed outside the inner casing. And a steam inlet for supplying steam to the internal compartment. In the intermediate / high pressure turbine 12, a plurality of moving blades connected to the rotor 22 and a plurality of stationary blades arranged inside the internal casing are alternately arranged. In the intermediate / high pressure turbine 12, steam is supplied from the steam inlet portion, whereby steam flows between the moving blade and the stationary blade, and the moving blade rotates by the force of the steam. Thereby, the rotor 22 rotates.

  Next, the low-pressure turbines 14, 16, and 18 will be described with reference to FIGS. FIG. 2 is a cross-sectional view illustrating a low-pressure turbine of a steam turbine according to an embodiment of the present invention. 3 is a cross-sectional view of the low-pressure turbine shown in FIG. 2 cut along a horizontal plane. The low-pressure turbines 14, 16, and 18 have basically the same configuration except for the arrangement positions, and therefore the low-pressure turbine 14 will be described below.

  The low-pressure turbine 14 has basically the same configuration as that of the medium- and high-pressure turbine 12, and a moving blade 30 fixed to the rotor 22 and an inner casing in which a plurality of stationary blades are arranged on the outer periphery of the moving blade 30. 32 and an external compartment 34 arranged outside the internal compartment 32. The low-pressure turbine 14 is supplied with steam having a lower pressure than the medium-high pressure turbine 12.

  This will be described in detail below with reference to FIGS. Here, in the low-pressure turbine 14, the external compartment 34 includes an external compartment lower half (external compartment lower part) 51 and an external compartment upper half (external compartment upper part) 52. The outer casing lower half 51 has a shape with an open top and is installed at a predetermined position. The lower half 51 of the outer casing serves as a foundation for each part of the low-pressure turbine 14. The outer casing lower half 51 is provided with a support portion 80 in a direction orthogonal to the axial direction, and the support portion 80 is placed on the gantry 100. That is, the outer casing lower half 51 is supported by the gantry 100 via the support portion 80. The outer casing upper half 52 has a semicircular cross section with its lower opening, and is fixed to the upper portion of the outer casing lower half 51. The inner casing 32 has a ring shape in which an inner casing upper part 54 and an inner casing lower part 55 having a semicircular cross section are combined. Arranged in the hollow formed by the upper half 52.

  The inner casing lower portion 55 has flange portions (support members) 56 fixed to outer peripheral portions on both sides in the radial direction, and the flange portions 56 are placed in the recesses 51 a of the outer casing lower half 51. The inner casing lower part 55 has an axial key fixed to the lower part, and this axial key is positioned and supported by an axial key fixed to the outer casing lower half 51. On the other hand, in the inner casing upper part 54, like the inner casing lower part 55, flange portions (support members) 60 are fixed to the outer peripheral portions on both sides in the radial direction, and each flange portion 60 is connected to the outer casing lower half 51. Is placed in the recess 51a. Further, the upper portion 54 of the inner compartment 54 is formed with an opening 61, and a steam inlet 62 is provided by fixing a steam nozzle 62 therein.

  The two blade ring 64 has a ring shape and is disposed on both sides of the steam inlet 63 inside the inner casing 32. The wing ring ring 64 has a ring shape by combining a wing ring ring upper part 65 and a wing ring ring lower part 66 having a semicircular shape. The wing ring ring upper part 65 is arranged inside the inner casing upper part 54, the flange part 68 is fixed to the outer peripheral part on both sides in the radial direction, and each flange part 68 is connected to the inner casing upper part 54. The ribs fixed between the blade ring ring upper parts 65 are positioned and supported by the ribs fixed to the inner casing upper part 54. The wing ring ring lower portion 66 is disposed inside the inner casing lower portion 55, the flange portions 69 are fixed to the outer peripheral portions on both sides in the radial direction, and each flange portion 69 is connected to the inner casing lower portion 55. The rib fixed between the blade ring lower portions 66 is positioned and supported by the axial key.

  The four partition walls 70 have a ring shape and are disposed on both sides of the steam inlet portion 63 between the inner casing 32 and the blade ring 64. The partition wall 70 has a ring shape by combining a semi-circular partition wall upper part and partition wall lower part. The partition wall lower portion has an inner peripheral portion (one end portion) fixed to the outer peripheral portion of the blade ring ring lower portion 66 and a circumferential end portion fixed to the flange portion 69. The lower part of the partition wall is connected to the inner casing lower part 55 with a predetermined gap at the outer peripheral part (other end part). On the other hand, an inner peripheral portion (one end portion) of the partition wall upper portion is fixed to the outer peripheral portion of the blade ring ring upper portion 65, and a circumferential end portion is fixed to the flange portion 68. In addition, the upper part of the partition wall is connected to the inner casing upper part 54 with a predetermined gap at the outer peripheral part (the other end part).

  Each blade ring 64 has a rotor 22 penetrating inside thereof and is rotatably supported by a bearing (not shown). A plurality of moving blades are fixed to the outer peripheral surface of the rotor 22 along the circumferential direction, and are provided in multiple stages along the axial direction. A plurality of stationary blades (not shown) are fixed to the blade ring 64 along the circumferential direction, and are provided in multiple stages along the axial direction. In this case, the moving blades and the stationary blades are alternately arranged in the axial direction of the rotor 22.

  Accordingly, when the steam enters the inner casing 32 from the steam inlet 63 during the operation of the steam turbine, the steam is guided to the partition wall 70 and is passed through the plurality of stationary blades supported by the blade ring 64 to the moving blade. The rotor 22 is rotated by jetting, and the generator 8 connected to the rotor 22 is driven.

  In the steam turbine 10 of the present embodiment, the three low-pressure turbines 14, 16, and 18 having the above-described configuration are arranged in series with the rotor 22. Specifically, the low-pressure turbines 14, 16, 18 are arranged between the medium-high pressure turbine 12 and the generator 8 in the order of the low-pressure turbines 14, 16, 18 from the medium-high pressure turbine 12 side.

  The position adjusting mechanism 24 includes two shafts 40, a plurality of arms 42, two actuators 44, and a plurality of seals 46. In the position adjusting mechanism 24, one shaft 40, a plurality of arms 42, a single actuator 44, and a plurality of seals 46 form one unit, and the Y axis direction ends of the low-pressure turbines 14, 16, 18 are arranged at one end. Has been placed. That is, in the position adjustment mechanism 24, two units are arranged with the low-pressure turbines 14, 16, and 18 sandwiched from the side surfaces.

  As shown in FIG. 1, the shaft 40 is a rod-like member, and is arranged in a direction parallel to the axial direction of the rotor 22. The shaft 40 is arranged in the entire range of the range in which the low-pressure turbines 14, 16 and 18 are arranged in the axial direction. That is, the shaft 40 is disposed to face the side surfaces (surfaces orthogonal to the Y-axis direction) of the low-pressure turbines 14, 16, 18. The shaft 40 is a member in which a plurality of rod-like members are connected by a universal joint 48. That is, a part of the shaft 40 is connected by the universal joint 48. In the axial direction of the shaft 40, a universal joint 48 is disposed between the low pressure turbine 14 and the low pressure turbine 16, and a universal joint 48 is disposed between the low pressure turbine 16 and the low pressure turbine 18. The shaft 40 is divided into a plurality of regions by the universal joint 48, so that when a displacement occurs between the regions, the shaft 40 can be deformed according to the displacement, and the force is concentrated on the shaft 40. Can be suppressed. Thereby, durability of the shaft 40 can be made high. Here, in the shaft 40 of the present embodiment, the universal joint 48 is provided between the low-pressure turbine 14 and the low-pressure turbine 16 and between the low-pressure turbine 16 and the low-pressure turbine 18. The arrangement position is not limited to this. For example, the shaft 40 may be provided with a universal joint between the actuator 44 and the low-pressure turbine 14. Further, the shaft may be provided with a plurality of universal joints between the respective devices described above. Moreover, the arrangement | positioning position and number of a universal joint are not limited to the above, What is necessary is just to provide the required number in a required position.

  The shaft 40 is formed with a thread groove 49 a at a position facing the low pressure turbine 14, a thread groove 49 b is formed at a position facing the low pressure turbine 16, and a thread groove 49 c is formed at a position facing the low pressure turbine 18. . The arm 42 is engaged with a region where the thread grooves 49a, 49b, and 49c of the shaft 40 are formed.

  As shown in FIG. 1, one arm 42 is disposed on each side surface of the low-pressure turbine 14, 16, 18. That is, one unit has one arm 42 arranged in each of the low-pressure turbines 14, 16, and 18. The low-pressure turbines 14, 16, and 18 are each provided with two arms 42, one on each of two side surfaces that are surfaces orthogonal to the Y-axis direction.

  The arm 42 is a rigid body disposed through the external compartment 34. That is, part of the arm 42 is inside the external compartment 34 and part is outside the external compartment 34. In the arm 42, an internal portion of the external compartment 34 is connected to the internal compartment 32, specifically, at least one of the internal compartment upper part 54 and the internal compartment lower part 55. Here, the arm 42 may be connected to the internal casing 32 and may be connected to the flange portions 56 and 60. As for the arm 42, the screw hole is formed in the outer part outside the exterior compartment 34, and the shaft 40 is inserted in the part in which the screw hole is formed. The arm 42 is meshed with the corresponding screw grooves 49 a, 49 b, 49 c of the shaft 40 at the portion where the screw hole is formed. As a result, the shaft 40 and the arm 42 have the same relationship as the relationship between the ball screw and the nut, and when the shaft 40 rotates, the arm 42 extends in the shaft 40 direction, that is, the axial direction of the rotor 22 (X-axis direction). )

  The actuator 44 is a drive source that rotates the shaft 40. The actuator 44 of this embodiment is connected to the end portion of the shaft 40 on the medium-to-high pressure turbine 12 side.

  The seal 46 is disposed for each arm 42 and fills a gap between the arm 42 and the external compartment 34. That is, the seal 46 is a member that maintains the outer casing 34 in a portion where the arm 42 is inserted in an airtight state. The seal 46 is formed of a deformable material (caulking material, sealing material) such as rubber or silicon, or a metal bellows, and even if the arm 42 moves relative to the external compartment 34, The airtight state between the arms 42 is maintained.

  The position adjusting mechanism 24 is configured as described above, and the shaft 42 is rotated by the actuator 44 to move the arm 42 engaged with any one of the thread grooves 49a, 49b, 49c of the shaft 40 in the axial direction. Can do. The position adjusting mechanism 24 can move the internal casing 32 connected to the arm 42 in the axial direction by moving the arm 42 in the axial direction. The position adjusting mechanism 24 can adjust the relative position between the internal casing 32 and the moving blade 30 (or the rotor 22) in the axial direction by moving the internal casing 32 in the axial direction.

  In the position adjusting mechanism 24, shafts 40 are disposed on both side surfaces of the low-pressure turbines 14, 16, and 18. In the position adjusting mechanism 24, an arm 42 connected to the internal casing 32 of the low-pressure turbine 14, 16, 18 is engaged with one shaft 40. Thereby, the position adjustment mechanism 24 can move the arm 42 connected to each of the low-pressure turbines 14, 16, 18 in the axial direction integrally by rotating the shaft 40 with the actuator 44. Thereby, the position adjusting mechanism 24 can simultaneously adjust the relative positions of the internal casing 32 and the moving blade 30 (or the rotor 22) in the axial direction of the plurality of low-pressure turbines 14, 16, and 18.

  The relative position detection sensor 26 is installed in the low pressure turbine 18. The relative position detection sensor 26 detects the relative position in the axial direction (X-axis direction) between the internal casing 32 of the low-pressure turbine 18 and the moving blade 30. The relative position detection sensor 26 sends the detected result to the control device 28.

  The control device 28 controls driving of the position adjustment mechanism 24. The control device 28 rotates the shaft 40 with the actuator 44 based on the detection result of the relative position detection sensor 26.

  The steam turbine 10 and the position adjustment mechanism 24 are configured as described above. The steam turbine 10 drives the position adjustment mechanism 24 by the control device 28 based on the detection result of the relative position detection sensor 26, thereby causing the internal casing 32 of the low-pressure turbines 14, 16, 18, and the moving blade 30 (or The relative position with respect to the rotor 22) can be adjusted simultaneously.

  Thereby, when each part of the steam turbine 10 is heated and thermally deformed at the time of start-up or the like, the internal casing 32 and the moving blade 30 (or the rotor 22) even when there is a difference in deformation caused by members in particular. ) Can be prevented from shifting in relative position. Further, since the displacement of the relative position between the inner casing 32 and the moving blade 30 (or the rotor 22) can be suppressed, the static fixed to the inner casing 32 and the moving blade 30 (or the rotor 22), particularly the inner casing 32 is fixed. Even if the distance between the blade and the moving blade 30 fixed to the rotor 22 is reduced, it is possible to suppress contact between the two. Thereby, the distance of a stationary blade and a moving blade can be shortened, and the rotor 22 can be rotated more efficiently.

  Further, the position adjusting mechanism 24 moves the arms 42 connected to the plurality of turbines by the rotation of one shaft 40, thereby driving the internal casings 32 and the blades 30 of the plurality of turbines by driving one actuator. The relative position of can be adjusted. Thereby, the number of actuators can be reduced.

  Here, in the position adjustment mechanism 24, it is preferable that the pitches of the thread grooves 49a, 49b, and 49c of the shaft 40 are different. That is, it is preferable that the position adjusting mechanism 24 changes the pitch of the screw grooves 49a, 49b, 49c depending on the position where it is formed.

  Specifically, as the position of the rotor 22 in the X direction is fixed, in this embodiment, as the distance from the position of the bearing 23 increases, the pitch of the thread groove is increased, that is, the distance moved in the axial direction in one rotation is increased. It is preferable to make it long. Since the rotor 22 is added with the extension in the axial direction with the position where the position in the X direction is fixed as the base point, the extension in the axial direction increases as the position of the rotor 22 moves away from the position where the position in the X direction is fixed. . Therefore, the moving blade 30 fixed to the rotor 22 also has a longer moving distance in the axial direction as the moving blade 30 moves away from the position where the position in the X direction is fixed. The position adjustment mechanism 24 can be moved more greatly as the arm 42 is further away from the position of the bearing 23 by increasing the pitch of the thread groove as it is away from the position of the bearing 23. Thereby, even when moving the internal casing 32 of a plurality of turbines with a single shaft 40, the internal casing 32 can be moved by a distance suitable for the relationship between the internal casing 32 and the moving blade 30. . Further, the steam turbine 10 is changed in the relative position between the inner casing 32 and the moving blade 30 of each turbine, that is, the elongation of the rotor 22 at each position, depending on the operating state through experiments, measurements, simulations, and the like. By acquiring information and determining the pitch of the thread groove formed in the shaft 40 based on the result, the internal casing 32 and the moving blade 30 of each turbine can be maintained at a suitable relative position.

  Further, the steam turbine 10 can adjust the relative position according to the distance between the internal casing 32 and the moving blade 30 by driving the position adjusting mechanism 24 based on the result of the relative position detection sensor 26. it can. Thereby, the relative position of the internal casing 32 and the moving blade 30 can be maintained in a more appropriate range. In this embodiment, the relative position detection sensor 26 is arranged in the low-pressure turbine 18 so that adjustment is performed based on the detection result of the turbine having the largest change in the relative distance between the internal casing 32 and the moving blade 30. be able to. The position of the relative position detection sensor 26 is not particularly limited, and the relative relationship between the internal casing 32 of the low-pressure turbine 16 and the moving blade 30 may be detected, or the internal casing 32 and the moving blade of the low-pressure turbine 14 may be detected. A relative relationship with 30 may be detected. Moreover, you may detect the relative relationship of a some measurement position.

  In the present embodiment, the position adjustment mechanism 24 is driven based on the result of the relative position detection sensor 26, but the result of the relative position detection sensor 26 may not be used.

  Here, the configuration of the position adjusting mechanism is not limited to the above embodiment. Hereinafter, a position adjusting mechanism of another embodiment will be described with reference to FIGS. The steam turbine having the cooling mechanism described below is the same as the steam turbine 10 shown in FIGS. 1 to 4 except for the configuration of the cooling mechanism. Therefore, below, description of the part of the structure similar to the steam turbine 10 is abbreviate | omitted, and demonstrates a difference mainly.

  FIG. 4 is a cross-sectional view illustrating a low-pressure turbine of a steam turbine according to another embodiment. FIG. 5 is a partial side view of the turbine shown in FIG. 4. In the position adjusting mechanism 24 a of the low-pressure turbine 14 a shown in FIGS. 4 and 5, the wheel 102 is disposed on the lower surface of the flange portion 56 of the internal casing 32. The wheels 102 are inserted into rails 51 b formed in the recesses 51 a of the outer casing lower half 51. The rail 51b extends in the axial direction (X-axis direction). The wheel 102 is movable along the rail 51b. As described above, the wheel 102 is provided at a contact portion between the internal compartment 32 and the external compartment 34, that is, between the internal compartment 32 and the external compartment 34. The position adjusting mechanism 24 a is provided with the wheels 102, so that the internal casing 32 can easily move in the axial direction with respect to the external casing 34. Thereby, the position adjustment mechanism 24a can make the internal casing 32 easier to move in the axial direction.

  FIG. 6 is a cross-sectional view illustrating a low pressure turbine of a steam turbine according to another embodiment. In the position adjusting mechanism 24b of the low-pressure turbine 14b shown in FIG. 6, the wheels 112 are arranged on the lower surface of the flange portion 56 of the internal casing 32 in the same manner as the position adjusting mechanism 24a shown in FIGS. Further, the position adjustment mechanism 24 b has wheels 114 arranged on the side surfaces of the flange portion 56 of the internal casing 32. That is, the wheel 114 is arranged at the end of the internal casing 32 in the Y-axis direction. The wheels 114 are in contact with the surface 51c on the inner compartment 32 side of the lower half 51 of the outer compartment. Therefore, the wheel 114 is disposed between the internal compartment 32 and the external compartment 34 in the Y-axis direction. As described above, the position adjusting mechanism 24b provides the wheels 114 between the horizontal end face of the internal casing 32 and the external casing 34 so that the internal casing 32 is smoother than the axial direction (X-axis direction). Can be moved to. Specifically, a wheel 114 is provided between the inner casing 32 and the outer casing 34 at both ends in the Y-axis direction, and the gap between the inner casing 32 and the outer casing 34 in the Y-axis direction is reduced, or By eliminating, it is possible to suppress the internal casing 32 from rotating around the Z axis during movement in the X axis direction. Thereby, the position adjustment mechanism 24a can make the internal casing 32 easier to move in the axial direction.

  Moreover, in the said embodiment, although the wheel was arrange | positioned between the internal compartment 32 and the external compartment 34 as a mechanism which becomes easy to move the internal compartment 32 with respect to the external compartment 34, it is not limited to this. As the position adjustment mechanism, various mechanisms that reduce friction between the internal compartment 32 and the external compartment 34 can be used as a guide mechanism in the same manner as the wheels. As the guide mechanism, a rotating wheel or roller, a smooth protrusion shape (curved surface shape) with reduced resistance, or the like can be used. The guide mechanism may be disposed on the contact surface between the internal compartment 32 and the external compartment 34, and may be disposed in the internal compartment 32 or the external compartment 34.

  FIG. 7 is a top view showing a schematic configuration of a power generation system having a steam turbine according to another embodiment. 8 is a cross-sectional view taken along line AA in FIG. The position adjustment mechanism 24c of the steam turbine 10a shown in FIG. 7 has a plurality of bearings 120 into which the shaft 40 is inserted. The bearing 120 shown in FIG.7 and FIG.8 is being fixed to the installation surface etc. in which the steam turbine 10a is installed. That is, the bearing 120 is fixed to a portion where the steam turbine 10a does not move. The bearing 120 supports the shaft 40 in a state where it can move in the axial direction (X-axis direction) or in a state where it can rotate. The bearing 120 supports the shaft 40 in a state where the shaft 40 cannot move in the Y-axis direction and the Z-axis direction. In addition, the bearing 120 is disposed in two locations in the axial direction, between the screw groove 49a and the screw groove 49b and between the screw groove 49b and the screw groove 49c (four locations including the two units). ing. The position adjusting mechanism 24c can suppress the occurrence of buckling of the shaft 40 by providing the bearing 120 on the path of the shaft 40 and supporting the shaft 40 with the bearing 120 in the Y-axis direction and the Z-axis direction. In this embodiment, the bearing 120 is provided between the low-pressure turbine 14 and the low-pressure turbine 16 and between the low-pressure turbine 16 and the low-pressure turbine 18. However, the arrangement position is not limited to this. For example, the bearing 120 may be provided between the actuator 44 and the low-pressure turbine 14. Moreover, you may provide a some bearing between each apparatus mentioned above. Moreover, the arrangement | positioning position and number of a bearing are not limited to the above, What is necessary is just to provide the required number in a required position. The movement adjusting mechanism preferably adjusts the arrangement position and number of universal joints 48 according to the arrangement of the bearings 120, and conversely adjusts the arrangement position and number of bearings 120 according to the arrangement of the universal joints 48. It is preferable to do.

  FIG. 9 is a cross-sectional view of a low-pressure turbine according to another embodiment cut along a horizontal plane. In the position adjusting mechanism 24 d of the steam turbine 10 b shown in FIG. 9, the end of the arm 144 on the shaft 140 side branches into two branch portions 150. The shaft 140 is inserted into the two branch portions 150. The shaft 140 has a thread groove 152 a formed at a position where the shaft 140 meshes with one branch part 150, and a thread groove 152 b formed at a position where the shaft 140 meshes with the other branch part 150. The position adjusting mechanism 24d can connect one arm 144 to the shaft 140 at two locations by providing the two branch portions 150. Thereby, the arm 144 can be stably connected to the shaft 140. In addition, the load applied to the portion of the arm 144 that engages with the shaft 140 can be reduced, and the arm 144 can be moved more smoothly.

  FIG. 10 is a top view showing a schematic configuration of a power generation system having a steam turbine according to another embodiment. In the position adjusting mechanism 24e of the steam turbine 10c shown in FIG. 10, two arms 244 on one side surface of the internal casing 32 of one low-pressure turbine 14 are connected. The two arms 244 are connected to different positions in the axial direction on one side surface of the internal casing 32. Thus, the position adjusting mechanism 24e has four arms 244 connected to the internal casing 32 of one low-pressure turbine 14. Therefore, the position adjusting mechanism 24e is provided with two arms 244 for each low-pressure turbine 14 with respect to one unit (one shaft 240). In addition, since the arms 244 penetrate the external casing 34, a seal 246 is provided for each of them.

  Further, the shaft 240 is formed with a thread groove at a portion engaging with the arm 244. Specifically, from the actuator 44 side, screw grooves 249a and 249b corresponding to the arm 244 connected to the internal casing 32 of the low-pressure turbine 14, and screw grooves corresponding to the arm 244 connected to the internal casing 32 of the low-pressure turbine 16 249c and 249d and screw grooves 249e and 249f corresponding to the arm 244 connected to the internal casing 32 of the low-pressure turbine 18 are provided.

  Thus, the position adjusting mechanism 24e can reduce the load applied to one arm 244 by connecting the plurality of arms 244 to the internal casing 32 of the low-pressure turbine 14. Thereby, when the internal casing 32 is moved by the position adjusting mechanism 24e, the force applied from the arm 244 to the internal casing 32, that is, the force pushing the internal casing 32 can be dispersed. Thereby, it can suppress that the force concerning the internal compartment 32 concentrates. Moreover, the internal casing 32 can be easily moved by applying force from a plurality of positions in the axial direction.

  FIG. 11 is a cross-sectional view illustrating a low pressure turbine of a steam turbine according to another embodiment. 12 is a side view showing a schematic configuration of the arm shown in FIG. FIG. 13 is a perspective view showing a schematic configuration of the arm shown in FIG. The position adjusting mechanism 24f of the steam turbine 10d shown in FIGS. 11 to 13 includes a support mechanism 301 that supports the arm 342 and a moving mechanism 302 that moves the arm 342 in the axial direction.

  The support mechanism 301 includes a support portion 332 that is disposed on the gantry 100 and that is disposed on the lower side in the vertical direction of the arm 342. The gantry 100 is a portion that supports the support portion 80 of the lower half 51 of the outer casing 51 of the steam turbine 10d. The support portion 332 includes a linear motion guide (X-axis direction guide) 351, a linear motion guide (Y-axis direction guide) 352, and a connecting member (intermediate member) 353.

  The linear motion guide 351 is a mechanism for guiding the arm 342 along the axial direction (X-axis direction), specifically, a plain bearing, and includes a rail 354 and a block (reciprocating body) 355. The rail 354 is a linear member and is disposed on the gantry 100 in a direction along the axial direction. The rail 354 guides the block 355 along the axial direction. The block 355 is disposed on the rail 354 so as to be movable in the axial direction. The blocks 355 are arranged at two positions in the axial direction.

  The linear motion guide 352 is a mechanism for guiding the arm 342 along the Y-axis direction, specifically, a plain bearing, and includes a rail 356 and a block (reciprocating body) 357. The rail 356 is a linear member and is disposed on the block 355 in a direction along the Y-axis direction. The rail 356 guides the block 357 along the Y-axis direction. The block 357 is disposed on the rail 356 so as to be movable in the axial direction. In the linear motion guide 352, units in which the rail 356 and the block 357 are combined are arranged in two blocks 355, respectively.

  The connecting member 353 connects the arm 342 and the linear motion guide 352. The connecting member 353 is fixed to the blocks 357 disposed on the two blocks 355 and is fixed to the arms 342. The connecting member 352 moves together with the arm 342.

  The support mechanism 301 is configured as described above, and supports the arm 342 on the installation surface in a state where the arm 342 is movable in the X-axis direction and the Y-axis direction. Thereby, the load applied to the arm 342 can be supported by the support mechanism 301, and the load applied to the moving mechanism 302 can be reduced.

  The moving mechanism 302 includes the above-described shaft 40 and a connecting member 360 connected to the shaft 40. The connecting member 360 is engaged with the arm 342 in a state of being movable in the Y-axis direction. The connecting member 360 meshes with the thread groove of the shaft 40, and moves in the axial direction when the shaft 40 rotates. In the moving mechanism 302, when the connecting member 360 moves in the axial direction, the arm 342 moves in the axial direction together with the connecting member 360. Thereby, the moving mechanism 302 can move the arm 342 in the axial direction. Further, the moving mechanism 302 can move the arm 342 in the Y-axis direction with respect to the connecting member 360 when the arm 342 moves in the Y-axis direction. Thereby, even if the internal casing 32 is deformed (heat stretched) in the Y-axis direction and moves in the Y-axis direction of the arm 342, the moving mechanism 302 can slide the arm 342 in accordance with the movement. Thereby, the deformation | transformation (thermal elongation) of the Y-axis direction of the internal compartment 32 can be accept | permitted, and it can suppress that load concentrates.

  The moving mechanism 302 may further include a mechanism that can slide in the Z-axis direction between the arm 342 and the connecting member 360. Accordingly, the moving mechanism 302 can allow deformation (thermal elongation) of the internal casing 32 in the Z-axis direction.

  By providing the support mechanism 301, the position adjustment mechanism 24f can reduce the load applied to the moving mechanism 302, specifically, the shaft 40. Further, the position adjusting mechanism 24f is provided with a guide mechanism that is movable in the Y-axis direction in the support mechanism 301 and the moving mechanism 302, so that even when the internal casing 32 extends in the Y-axis direction due to heat or the like, Since the elongation can be absorbed, the load applied to the shaft 40 and the shaft 42 of the position adjusting mechanism 24f can be reduced. Moreover, the force which suppresses a deformation | transformation of the internal compartment 32 acts on the internal compartment 32 from the position adjustment mechanism 24f, and it can suppress that a nonuniform load is applied to an internal compartment.

  Further, the steam turbine of the above embodiment adjusts the relative position in the axial direction (X-axis direction) between the inner casings of the plurality of low-pressure turbines and the rotor blades (rotors) by the position adjustment mechanism, thereby reducing the performance of the low-pressure turbine. Can be made higher. For example, even with a large-sized low-pressure turbine, the axial length is increased, and the relative position between the inner casing of the downstream turbine and the moving blade is increased. Can be maintained. In the present embodiment, the target for adjusting the relative position between the internal casing and the rotor blade (rotor) is a low-pressure turbine, but the present invention is not limited to this, and there are various types such as a high-pressure turbine, a medium-high pressure turbine, and a high-pressure turbine. It can be used for turbines.

  Moreover, although the position adjustment mechanism of the said Example was set as the arrangement | positioning with which an arm penetrates an external compartment and a shaft is outside an external compartment, it is not limited to this. The position adjustment mechanism may be arranged such that the arm is disposed inside the external compartment and the shaft penetrates the external compartment.

DESCRIPTION OF SYMBOLS 1 Power generation system 8 Generator 10 Steam turbine 12 Medium-high pressure turbine 14, 16, 18 Low-pressure turbine 22 Rotor 24 Position adjustment mechanism 26 Relative position detection sensor 28 Control apparatus 30 Rotor blade 32 Internal compartment 34 External compartment 40 Shaft 42 Arm 44 Actuator 46 Seal 48 Universal joint 49a, 49b, 49c Thread groove 51 Support base (lower external compartment)
51a Concave portion 54 Upper portion of internal casing 55 Lower portion of inner casing 56, 60 Flange portion 61 Opening portion 62 Steam pipe base 63 Steam inlet portion 64 Blade ring ring 65 Blade ring ring upper portion 66 Blade ring ring lower portion 68, 69 Flange portion 70 Bulkhead

Claims (12)

A rotor, a moving blade fixed to the rotor, an inner casing disposed facing the moving blade, and a stationary blade fixed to an inner surface, and an outer casing disposed on the outer periphery of the inner casing. A plurality of turbines, and a steam turbine position adjustment mechanism comprising:
A plurality of arms connected to each of the internal compartments of the plurality of turbines;
A shaft in which a plurality of screw grooves are formed, and a plurality of the arms are fitted in each of the screw grooves;
A drive source that rotates the shaft and moves the plurality of arms fitted in the screw grooves in the axial direction of the rotor;
The shaft is rotated by the drive source, the plurality of arms are moved in the axial direction, and the relative positions in the axial direction of the rotor between the plurality of blades and the internal casing are moved in conjunction with each other. Characteristic position adjustment mechanism.   The position adjusting mechanism according to claim 1, wherein a pitch of the shaft is different depending on a position where the plurality of screw grooves are formed. The drive source is disposed at an end portion on the side where the axial position of the rotor is fixed with respect to the plurality of turbines,
The position adjusting mechanism according to claim 2, wherein the shaft has a pitch larger in the screw groove far from the drive source than in the screw groove closer to the drive source.   4. The position adjustment according to claim 1, wherein the arm has an end portion on the shaft side branched into a plurality of portions, and the branched portions are respectively connected to the shaft. 5. mechanism.   5. The position adjusting mechanism according to claim 1, wherein a plurality of the arms are provided with respect to one internal casing.   The shaft is provided with a universal joint in at least one of a position between the turbine and another turbine and a position between the turbine and an actuator in the axial direction. The position adjustment mechanism according to any one of claims 1 to 5.   In the axial direction, the shaft arranged in at least one of a position between the turbine and the other turbine and a position between the turbine and the actuator is movable in the axial direction. The position adjusting mechanism according to any one of claims 1 to 6, further comprising a bearing that regulates a position in a planar direction orthogonal to the axial direction.   The position adjustment mechanism according to any one of claims 1 to 7, wherein the arm has a guide mechanism that reduces a resistance during movement in the axial direction at a contact portion with the external casing. . The arm penetrates the external compartment, and at least a part thereof is disposed outside the external compartment,
The position adjustment mechanism according to any one of claims 1 to 8, wherein the shaft is fitted to a portion of the arm outside the external casing.   The position adjustment mechanism according to any one of claims 1 to 9, wherein the arm includes a movement mechanism that assists movement in a planar direction perpendicular to the axial direction with respect to the external casing. . The position adjustment mechanism according to any one of claims 1 to 10,
The rotor;
A steam turbine comprising the plurality of turbines.   The steam turbine according to claim 11, wherein the plurality of turbines include low-pressure turbines.

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