Turbine bearing device and turbine

Abstract

To enable a proper amount of a lubrication oil to exist between a turbine rotor and a bearing during assembly of the turbine at which an oil supply pipe is not connected to a bearing box.SOLUTION: A bearing device includes: a bearing rotatably supporting a turbine rotor; and a bearing box which encloses the bearing. The bearing box and the bearing have a first oil supply line and a second oil supply line which extend from the bearing box and continue into the bearing. Each of the first oil supply line and the second oil supply line has: an inlet which is formed at the bearing box and may receive a lubrication oil from the outside of the bearing box; and an outlet which is formed at the bearing and may discharge the lubrication oil flowing through the inlet to a surface of the turbine rotor.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a bearing device that rotatably supports a turbine rotor, and a turbine including the bearing device. [Background technology]

[0002] The turbine includes a turbine rotor that is rotatable about a central axis, a casing that covers the turbine rotor, and a bearing device that rotatably supports the turbine rotor.

[0003] One example of a bearing device is disclosed in Patent Document 1 below. This bearing device has a bearing that rotatably supports a turbine rotor and a bearing housing that covers the bearing. The bearing housing is formed with an oil supply passage that guides lubricating oil from outside the bearing housing into the bearing housing, and an oil drain passage that guides the lubricating oil inside the bearing housing to the outside of the bearing housing. The bearing housing is also connected to an oil supply pipe that is connected to the oil supply passage of the bearing housing and guides lubricating oil from outside the casing to the oil supply passage, and an oil drain pipe that is connected to the bearing housing and guides lubricating oil from the oil drain passage to the outside of the casing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-002376 Summary of the Invention [Problem to be solved by the invention]

[0005] During the turbine assembly process, the turbine rotor may be rotated without the oil supply pipe and oil discharge pipe connected to the bearing housing. In this case, if lubricating oil is not present between the turbine rotor and the bearing, the friction between the turbine rotor and the bearing increases, placing a heavy load on the turbine rotor during rotation and potentially damaging the bearing. Therefore, even when the turbine rotor is rotated during the turbine assembly process, it is necessary to maintain lubricating oil between the turbine rotor and the bearing. To maintain lubricating oil between the turbine rotor and the bearing, one possible method is to apply lubricating oil to the outer circumferential surface of the turbine rotor before placing the bearing on the outer circumferential surface of the turbine rotor. However, with this method, it is difficult to maintain an appropriate amount of lubricating oil between the turbine rotor and the bearing once the bearing is placed on the outer circumferential surface of the turbine rotor.

[0006] The present disclosure aims to provide a bearing device that can easily provide an appropriate amount of lubricating oil between the turbine rotor and the bearing even during the turbine assembly process when the oil supply pipe is not connected to the bearing housing, and a turbine equipped with this bearing device. [Means for solving the problem]

[0007] In order to achieve the above object, one aspect of the disclosure of a turbine bearing device is to provide: The turbine rotor includes a bearing that rotatably supports the turbine rotor about the central axis of the turbine rotor, and a bearing housing that surrounds the bearing. The bearing housing and the bearing have a first oil supply line and a second oil supply line that connect the bearing housing to the bearing. The first oil supply line and the second oil supply line each have an inlet formed in the bearing housing that can receive lubricating oil from outside the bearing housing, and an outlet formed in the bearing that can discharge the lubricating oil that has flowed in from the inlet onto the surface of the turbine rotor. The bearing includes a bearing pad having a rotor-facing surface facing the outer peripheral surface of the turbine rotor, and a pad support portion supporting the bearing pad from the radially outer side relative to the central axis. The bearing further includes a plug capable of closing the inlet of the second oil supply line. The central axis extends horizontally. The outlet of the second oil supply line is formed in the pad support portion above the central axis.

[0008] When the turbine is in an operable state, the first oil supply line of the bearing device in this aspect is connected to a lubricating oil supplier located outside the turbine casing via an oil supply pipe. Therefore, in this aspect, when the turbine is operating, lubricating oil from the lubricating oil supplier is supplied between the turbine rotor and the bearing via the oil supply pipe and the first oil supply line of the bearing device.

[0009] Even during the turbine assembly process when the oil supply pipe is not connected to the bearing housing, the turbine rotor may be rotated to check the relative positional relationship between the turbine rotor and the bearing device, the rotational balance of the turbine rotor, etc. In this case, if there is no lubricating oil between the turbine rotor and the bearing, the frictional force between the turbine rotor and the bearing will be large, placing a great load on the rotation of the turbine rotor and possibly damaging the turbine rotor or the bearing. For this reason, even when the turbine rotor is rotated during the turbine assembly process, it is necessary to have lubricating oil between the turbine rotor and the bearing.

[0010] Therefore, in this aspect, when the turbine rotor is rotated during the turbine assembly process when the oil supply pipe is not connected to the bearing housing, lubricating oil can be supplied between the turbine rotor and the bearing from outside the bearing device via the second oil supply line of the bearing device. Therefore, in this aspect, even during the turbine assembly process, an appropriate amount of lubricating oil can be easily present between the turbine rotor and the bearing.

[0011] One aspect of a turbine for achieving the above object is as follows: The turbine rotor includes the bearing device of the above aspect, the turbine rotor, and a turbine casing that covers the turbine rotor. The turbine rotor has a rotor shaft centered on the central axis and a plurality of rows of moving blades provided on the outer periphery of the rotor shaft and aligned in the axial direction of the central axis. The bearing of the bearing device supports a region of the rotor shaft that is closer to the end in the axial direction than the plurality of rows of moving blades. The bearing housing has an outer periphery plate that covers the outer periphery of the bearing, and an end plate that extends radially inward from the end of the outer periphery plate with respect to the central axis. The inlet of the second oil supply line is formed in the end plate. Further, a turbine as another aspect for achieving the above object comprises: The turbine rotor includes a turbine rotor rotatable about a central axis, a turbine casing covering the turbine rotor, and a bearing device for the turbine rotor. The central axis extends horizontally. The turbine rotor includes a rotor shaft centered on the central axis, and a plurality of rows of moving blades provided on the outer periphery of the rotor shaft and aligned in the axial direction along the central axis. The bearing device includes a bearing that rotatably supports the turbine rotor about the central axis of the turbine rotor, and a bearing housing surrounding the bearing. The bearing supports an area of ​​the rotor shaft that is closer to the end in the axial direction than the plurality of rows of moving blades. The bearing housing includes an outer peripheral plate that covers the outer periphery of the bearing, and an end side plate that extends radially inward from the end of the outer peripheral plate with respect to the central axis. The bearing housing and the bearing have first and second oil supply lines connecting the bearing housing to the bearing. The first oil supply line and the second oil supply line each have an inlet formed in the bearing housing for receiving lubricating oil from outside the bearing housing and an outlet formed in the bearing for discharging the lubricating oil that has flowed in from the inlet to the surface of the turbine rotor. The bearing has a bearing pad having a rotor-facing surface facing the outer peripheral surface of the turbine rotor, and a pad support portion that supports the bearing pad from the radial outside with respect to the central axis. The inlet of the second oil supply line is formed in the end side plate. The outlet of the second oil supply line is formed in the pad support portion above the central axis.

[0012] The turbine of this aspect includes the bearing device of the above aspect, so that an appropriate amount of lubricating oil can be easily provided between the turbine rotor and the bearing even during the turbine assembly process. Furthermore, in this aspect, an operator can approach the inlet of the second oil supply line from the end where the rotor blade rows do not exist. Therefore, in this aspect, the operator can easily fill the lubricating oil through the second oil supply line. [Effects of the Invention]

[0013] In one aspect of the present disclosure, even during turbine assembly when the oil supply pipe is not connected to the bearing housing, an appropriate amount of lubricating oil can be easily placed between the turbine rotor and the bearing. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view of a main portion of a gas turbine in an embodiment according to the present disclosure. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5]FIG. 2 is a cross-sectional view of a second bearing device and its surroundings in a gas turbine according to an embodiment of the present disclosure. [Figure 6] 1 is a schematic cross-sectional view of a bearing device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of a bearing device and a turbine including the bearing device according to the present disclosure will be described with reference to the drawings.

[0016] "Embodiment" The turbine in this embodiment is a gas turbine, as shown in Fig. 1. This gas turbine includes a compressor 10 that compresses air, a combustor 19 that generates combustion gas by burning fuel in the air compressed by the compressor 10, a turbine 20 that is driven by the combustion gas, an intermediate casing 39 into which the compressed air discharged from the compressor 10 flows, an exhaust casing 30 through which exhaust gas, which is the combustion gas exhausted from the turbine 20, a first bearing device 40A, and a second bearing device 40B.

[0017] The compressor 10 has a compressor rotor 11 that rotates about a central axis Ar and a compressor casing 12 that covers the compressor rotor 11. The turbine 20 has a turbine rotor 21 that rotates about the central axis Ar and a turbine casing 22 that covers the turbine rotor 21. Here, the direction in which the central axis Ar extends is referred to as the axial direction Da, the circumferential direction about the central axis Ar is simply referred to as the circumferential direction Dc, and the direction perpendicular to the central axis Ar is referred to as the radial direction Dr. Furthermore, one side of the axial direction Da is referred to as the axial upstream side Dau, and the opposite side is referred to as the axial downstream side Dad. Furthermore, the side of the radial direction Dr that is closer to the central axis Ar is referred to as the radially inner side Dri, and the opposite side is referred to as the radially outer side Dro.

[0018] The compressor 10 is disposed on the axial upstream side Dau of the turbine 20. The compressor rotor 11 and the turbine rotor 21 are located on the same central axis Ar and are connected to each other to form a gas turbine rotor 1. To this gas turbine rotor 1, for example, a rotor of a generator is connected.

[0019] The compressor rotor 11 has a compressor rotor shaft 11a extending in an axial direction Da about a central axis Ar, and a plurality of rotor blade rows 11b attached to the compressor rotor shaft 11a. The plurality of rotor blade rows 11b are aligned in the axial direction Da. Each rotor blade row 11b is composed of a plurality of rotor blades aligned in a circumferential direction Dc. The compressor casing 12 has an outer casing 12o, an inner casing 12i, and struts 13. The outer casing 12o is cylindrical and centered on the central axis Ar, covering the outer periphery of the compressor rotor 11. The inner casing 12i is bell-mouth shaped and centered on the central axis Ar, is positioned radially inward of the outer casing 12o, and covers a portion of the gas turbine rotor 11 closer to a second end De2 than the plurality of rotor blade rows 11b. Here, the second end side De2 of the gas turbine rotor 1 refers to the axial upstream side Dau, which is the end side of the compressor rotor shaft 11a with respect to the multiple blade rows 11b of the compressor rotor 11. An annular air flow path 15 through which air flows is formed between the inner casing 12i and the outer casing 12o, and between the outer casing 12o and the compressor rotor shaft 11a. The inner casing 12i is supported by struts 13 extending radially inward Dri from the outer casing 12o.

[0020] The second bearing device 40B is disposed on the radially inner side Dri of the inner casing 12i of the compressor 10, and supports a portion of the gas turbine rotor 1 on the second end side De2 so that the gas turbine rotor 1 is rotatable.

[0021] The turbine rotor 21 has a turbine rotor shaft 21a that extends in the axial direction Da about the central axis Ar, and a plurality of rotor blade rows 21b attached to the turbine rotor shaft 21a. The plurality of rotor blade rows 21b are aligned in the axial direction Da. Each rotor blade row 21b is made up of a plurality of rotor blades aligned in the circumferential direction Dc. An annular combustion gas flow path 25 through which combustion gas flows is formed between the turbine casing 22 and the turbine rotor shaft 21a.

[0022] The intermediate casing 39 is disposed between the compressor casing 12 and the turbine casing 22 in the axial direction Da, and connects the compressor casing 12 and the turbine casing 22. The combustor 19 is provided in the intermediate casing 39 so that combustion gas generated in the combustor 19 flows into the combustion gas flow path 25 of the turbine 20.

[0023] The exhaust casing 30 is disposed on the axial downstream side Dad of the turbine 20. The exhaust casing 30 has a cylindrical casing main body 31 centered on the central axis Ar, an exhaust diffuser 32 disposed within the casing main body 31, and a plurality of struts 33. The casing main body 31 is connected to the end of the axial downstream side Dad of the turbine casing 22. The exhaust diffuser 32 has a cylindrical outer diffuser 32o disposed radially inward Dri of the casing main body 31 and centered on the central axis Ar, and a cylindrical inner diffuser 32i disposed radially inward Dri of the outer diffuser 32o and centered on the central axis Ar. The annular space between the outer diffuser 32o and the inner diffuser 32i forms an exhaust flow path 35 through which exhaust gas G exhausted from the combustion gas flow path 25 of the turbine 20 flows. A plurality of struts 33 extend radially inward Dri from the casing body 31 and penetrate through the outer diffuser 32o and the inner diffuser 32i.

[0024] The first bearing device 40A is disposed radially inward Dri of the inner diffuser 32i and rotatably supports a portion of the gas turbine rotor 1 on a first end side De1 of the plurality of moving blade rows 21b of the turbine rotor 21. Here, the first end side De1 of the gas turbine rotor 1 refers to the axial downstream side Dad, which is the end side of the turbine rotor shaft 21a relative to the plurality of moving blade rows 21b of the turbine rotor 21. The first bearing device 40A is supported by a plurality of struts 33 extending radially inward Dri from the casing body 31 of the exhaust casing 30. As described above, the gas turbine rotor 1 is rotatably supported by the first bearing device 40A disposed on the axial downstream side Dad of the gas turbine rotor 1 and the second bearing device 40B disposed on the axial upstream side Dau of the gas turbine rotor 1. Both the first bearing device 40A and the second bearing device 40B are journal bearing devices (radial plain bearing devices).

[0025] The compressor casing 12 , the intermediate casing 39 , the turbine casing 22 and the exhaust casing 30 are connected to one another to form the gas turbine casing 2 .

[0026] 2, the struts 33 of the exhaust casing 30 extend radially inward Dri from the casing body 31 of the exhaust casing 30 in a tangential direction relative to the turbine rotor 21. The struts 33 are covered with strut covers 34 along the extension direction of the struts 33. One end of the strut cover 34 in the extension direction is connected to the outer diffuser 32o, and the other end is connected to the inner diffuser 32i.

[0027] 2 to 4 and 6, the first bearing device 40A has a bearing 41A and a bearing housing 46A that covers the bearing 41A. The bearing housing 46A and the bearing 41A have a first oil supply line 50 and a second oil supply line 55 that connect the bearing housing 46A to the bearing 41A. The bearing housing 46A has an oil drain line 60 that can drain lubricating oil from the bearing housing 46A. Note that FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2, FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, and FIG. 6 is a schematic cross-sectional view of the first bearing device 40A and the second bearing device 40B.

[0028] The bearing 41A has two bearing pads 42, a pad support portion 43 that supports the bearing pads 42, and an oil ejection pipe 45. Each of the two bearing pads 42 is arc-shaped, with its inner peripheral surface forming a rotor-facing surface 42p. The two bearing pads 42 are arranged side by side in the circumferential direction Dc below the central axis Ar so that the rotor-facing surface 42p faces the outer peripheral surface of the turbine rotor 21. The pad support portion 43 is annular, centered on the central axis Ar. The two bearing pads 42 are arranged on the inner peripheral side of the pad support portion 43 and below the central axis Ar. The oil ejection pipe 45 extends from a position on the inner peripheral side of the pad support portion 43 where no bearing pads 42 are arranged toward the radially inward Dri. The oil ejection pipe 45 opens radially inward Dri from inside the pipe.

[0029] The bearing box 46A has a box body 47 that covers the bearing 41A, and an oil supply nozzle 48 and an oil drain nozzle 49 attached to the box body 47. The box body 47 has an outer peripheral plate 47c that covers the outer periphery of the bearing 41A, an end side plate 47a that extends radially inward Dri from the end of a first end side De1 of the outer peripheral plate 47c, and a rotor blade side plate 47b that extends radially inward Dri from the side opposite the first end side De1 of the outer peripheral plate 47c.

[0030] The oil supply nozzle 48 has a pipe 48p and a flange 48f attached to one end of the pipe 48p. The other end of the pipe 48p of the oil supply nozzle 48 is attached to the end side plate 47a at a portion below the central axis Ar. A first oil supply passage 53 is formed in the box body 47 and the pad support portion 43 of the bearing 41A. The first oil supply passage 53 is connected to the pipe 48p of the oil supply nozzle 48 and extends from the end side plate 47a to the outer peripheral plate 47c and the pad support portion 43 of the bearing 41A. The oil ejection pipe 45 of the bearing 41A is attached to the pad support portion 43 of the bearing 41A so as to be connected to the first oil supply passage 53.

[0031] The first oil supply line 50 described above is configured to include a flow path within the pipe 48p of the oil supply nozzle 48, a first oil supply flow path 53, and a flow path within the oil ejection pipe 45. An opening at one end of the pipe 48p of the oil supply nozzle 48 is an inlet 51 of the first oil supply line 50 that can receive lubricating oil from outside the bearing housing 46A. An opening of the oil ejection pipe 45 is an outlet 52 of the first oil supply line 50 that can discharge the lubricating oil that has flowed into the first oil supply line 50 from the inlet 51 onto the surface of the turbine rotor 21.

[0032] A second oil-feed horizontal passage 58 is formed in the box body 47. A second oil-feed vertical passage 59 communicating with the second oil-feed horizontal passage 58 is formed in the box body 47 and the pad support portion 43. The second oil-feed horizontal passage 58 penetrates in the axial direction Da a portion of the end side plate 47a of the box body 47 above the central axis Ar, and extends in the axial direction Da within the outer peripheral plate 47c of the box body 47. The second oil-feed vertical passage 59 extends vertically downward from an end of the second oil-feed horizontal passage 58 on the opposite side to the first end side De1 in the outer peripheral plate 47c, and penetrates vertically downward through the pad support portion 43.

[0033] The second oil supply line 55 described above is configured to have a second horizontal oil supply passage 58 and a second vertical oil supply passage 59. The opening of the end side plate 47a in the second horizontal oil supply passage 58 is an inlet 56 of the second oil supply line 55 that can receive lubricating oil from outside the bearing housing 46A. The opening of the pad support portion 43 in the second vertical oil supply passage 59 is an outlet 57 of the second oil supply line 55 that can discharge the lubricating oil that has flowed into the second oil supply line 55 from the inlet 56 onto the surface of the turbine rotor 21.

[0034] The oil drain nozzle 49 has a pipe 49p and a flange 49f attached to one end of the pipe 49p. The other end of the pipe 49p of the oil drain nozzle 49 is attached to a portion of the end plate 47a below the central axis Ar. The end plate 47a is formed with an oil drain passage 61 that communicates with the pipe 49p of the oil drain nozzle 49 and penetrates the end plate 47a in the axial direction Da.

[0035] The oil drain line 60 described above is configured to include a flow path in the piping 49p of the oil drain nozzle 49 and an oil drain flow path 61. The inner diameter of this oil drain line 60 is larger than the inner diameters of the first oil supply line 50 and the second oil supply line 55. The inner diameter of the first oil supply line 50 is also larger than the inner diameter of the second oil supply line 55. Therefore, the inner diameter of the second oil supply line 55 is smaller than the inner diameters of the oil drain line 60 and the first oil supply line 50.

[0036] 6 , the first bearing device 40A further includes an oil syringe 71 connectable to the inlet 56 of the second oil supply line 55, a plug 72 capable of closing the inlet 56 of the second oil supply line 55, an oil supply pipe 73 connectable to the oil supply nozzle 48, an oil drain pipe 74 connectable to the oil drain nozzle 49, and a lubricant oil supplier 75 connected to the oil supply pipe 73 and the oil drain pipe 74. The lubricant oil supplier 75 includes a lubricant oil tank 76 capable of temporarily storing the lubricant oil that has passed through the oil drain pipe 74 from inside the bearing housing 46A, and a lubricant oil pump 77 capable of sending the lubricant oil in the lubricant oil tank 76 into the bearing housing 46A through the oil supply pipe 73. The lubricant oil supplier 75 is disposed outside the gas turbine casing 2.

[0037] The flange 48f of the fuel supply nozzle 48 constitutes a connection portion for connecting the fuel supply pipe 73. The flange 49f of the fuel drain nozzle 49 constitutes a connection portion for connecting the fuel drain pipe 74.

[0038] 6 , when the gas turbine is in an operable state, the first oil supply line 50 of the first bearing device 40A is connected to a lubricant oil supplier 75 arranged outside the gas turbine casing 2 via an oil supply pipe 73. The inlet 56 of the second oil supply line 55 of the first bearing device 40A is closed by a plug 72. The oil drain line 60 of the first bearing device 40A is connected to the lubricant oil supplier 75 via an oil drain pipe 74.

[0039] In this embodiment, when the gas turbine is in operation, lubricating oil from a lubricating oil supplier 75 is supplied between the gas turbine rotor 1 and the bearing 41A via the oil supply pipe 73 and the first oil supply line 50 of the first bearing device 40A. At this time, because the inlet 56 of the second oil supply line 55 of the first bearing device 40A is blocked by the plug 72, it is possible to prevent the lubricating oil in the first bearing device 40A from flowing out of the first bearing device 40A via the second oil supply line 55 of the first bearing device 40A. The lubricating oil in the first bearing device 40A returns to the lubricating oil supplier 75 via the oil drain line 60 and oil drain pipe 74 of the first bearing device 40A.

[0040] Even during the turbine assembly process when the oil supply pipe 73 and the oil discharge pipe 74 are not connected to the bearing housing 46A, the gas turbine rotor 1 may be rotated to check the relative positional relationship between the gas turbine rotor 1 and the first bearing device 40A, the rotational balance of the gas turbine rotor 1, and the like. In this case, if there is no lubricating oil between the gas turbine rotor 1 and the bearing 41A, the frictional force between the gas turbine rotor 1 and the bearing 41A will increase, resulting in a large load being applied to the rotation of the gas turbine rotor 1 and possibly damaging the gas turbine rotor 1 and the bearing 41A. For this reason, even when the gas turbine rotor 1 is rotated during the turbine assembly process, it is necessary to keep lubricating oil present between the gas turbine rotor 1 and the bearing 41A.

[0041] Therefore, in this embodiment, when the gas turbine rotor 1 is rotated during the turbine assembly process when the oil supply pipe 73 is not connected to the bearing housing 46A, lubricating oil is supplied from the second oil supply line 55 to between the gas turbine rotor 1 and the bearing 41A. At this time, an oil syringe 71 containing lubricating oil is connected to the inlet 56 of the second oil supply line 55. Then, the oil syringe 71 is operated to push the lubricating oil from the oil syringe 71 into the second oil supply line 55. Therefore, in this embodiment, even during the turbine assembly process, an appropriate amount of lubricating oil can be easily provided between the gas turbine rotor 1 and the bearing 41A.

[0042] As described above, the outlet 57 of the second oil supply line 55 in this embodiment is formed above the central axis Ar. Therefore, the lubricating oil that comes out from the outlet 57 of the second oil supply line 55 falls by gravity and reaches the gas turbine rotor 1. Furthermore, above the central axis Ar, the weight of the gas turbine rotor 1 is not applied to the bearing 41A, and therefore the lubricating oil can easily enter between the gas turbine rotor 1 and the bearing 41A above the central axis Ar. Therefore, in this embodiment, the lubricating oil can easily enter between the gas turbine rotor 1 and the bearing 41A via the second oil supply line 55.

[0043] In this embodiment, the worker can approach the inlet 56 of the second oil supply line 55 from the first end side De1 where the rotor blade row 21b does not exist. Therefore, in this embodiment, the work of adding lubricating oil from the second oil supply line 55 can be easily performed.

[0044] Of the first bearing device 40A and the second bearing device 40B, the first bearing device 40A has been mainly described above. However, the second bearing device 40B is also configured in the same manner as the first bearing device 40A.

[0045] 5 and 6, the second bearing device 40B, like the first bearing device 40A, has a bearing 41B and a bearing housing 46B that covers the bearing 41B. Like the bearing housing 46A and bearing 41A of the first bearing device 40A, the bearing housing 46B and bearing 41B of the second bearing device 40B also have a first oil supply line 50 and a second oil supply line 55 that connect the bearing housing 46B to the bearing 41B. Like the bearing housing 46A of the first bearing device 40A, the bearing housing 46B of the second bearing device 40B also has an oil drain line 60 that can drain lubricating oil from the bearing housing 46B. Furthermore, like the first bearing device 40A, the second bearing device 40B has an oil syringe 71 connectable to the inlet 56 of the second oil supply line 55, a plug 72 capable of closing the inlet 56 of the second oil supply line 55, an oil supply pipe 73 connectable to the oil supply nozzle 48, an oil drain pipe 74 connectable to the oil drain nozzle 49, and a lubricant oil supplier 75 connected to the oil supply pipe 73 and the oil drain pipe 74. The lubricant oil supplier 75 has a lubricant oil tank 76 capable of temporarily storing the lubricant oil that has passed through the oil drain pipe 74 from inside the bearing housing 46B, and a lubricant oil pump 77 that can send the lubricant oil in this lubricant oil tank 76 into the bearing housing 46B via the oil supply pipe 73.

[0046] Similar to the bearing housing 46A of the first bearing device 40A, the bearing housing 46B of the second bearing device 40B has an outer peripheral plate 47c, an end side plate 47a, and a rotor blade side plate 47b. However, the outer peripheral plate 47c of the second bearing device 40B forms part of the inner casing 12i of the compressor 10 (see FIG. 1). The end side plate 47a of the second bearing device 40B extends radially inward Dri from the end of the second end side De2 of the outer peripheral plate 47c. The rotor blade side plate 47b of the second bearing device 40B extends radially inward Dri from the side opposite the second end side De2 of the outer peripheral plate 47c.

[0047] Therefore, in the second bearing device 40B of this embodiment, an appropriate amount of lubricating oil can be easily present between the gas turbine rotor 1 and the bearing 41B during the turbine assembly process when the oil supply pipe 73 is not connected to the second bearing device 40B.

[0048] Like the outlet 57 of the second oil supply line 55 in the first bearing device 40A, the outlet 57 of the second oil supply line 55 in the second bearing device 40B is also formed above the central axis Ar. Moreover, like the inlet 56 of the second oil supply line 55 in the first bearing device 40A, the inlet 56 of the second oil supply line 55 in the second bearing device 40B is formed in the end side plate 47a of the bearing housing 46B.

[0049] Therefore, in the second bearing device 40B as well, lubricating oil can be easily supplied between the gas turbine rotor 1 and the bearing 41B through the second oil supply line 55. Furthermore, an operator can approach the inlet 56 of the second oil supply line 55 from the second end side De2 where the rotor blade row 11b of the compressor 10 is not present.

[0050] The lubricant oil supplier 75 may be shared by the first bearing device 40A and the second bearing device 40B.

[0051] "Variations" Although the bearings 41A, 41B in the above-described embodiment have the oil ejection pipe 45, this oil ejection pipe 45 may be omitted. In this case, the outlet of the first oil supply line 50 is formed on the inner circumferential surface of the pad support portion 43 of the bearings 41A, 41B.

[0052] The first bearing device 40A and the second bearing device 40B in the above-described embodiments are bearing devices that rotatably support the gas turbine rotor 1. However, the bearing device may be any bearing device that rotatably supports a turbine rotor, and may be, for example, a bearing device that rotatably supports a steam turbine rotor.

[0053] "Addendum" The turbine bearing device in the above embodiment can be understood as follows, for example.

[0054] (1) The turbine bearing devices 40A and 40B in the first embodiment are The turbine rotor 1 includes bearings 41A and 41B that rotatably support the turbine rotor 1 about the central axis Ar of the turbine rotor 1, and bearing housings 46A and 46B that surround the bearings 41A and 41B. The bearing housings 46A and 46B and the bearings 41A and 41B have a first oil supply line 50 and a second oil supply line 55 that connect the bearing housings 46A and 46B to the bearings 41A and 41B. The first oil supply line 50 and the second oil supply line 55 are formed in the bearing housings 46A and 46B, respectively, and have inlets 51 and 56 that can receive lubricating oil from outside the bearing housings 46A and 46B, and outlets 52 and 57 that are formed in the bearings 41A and 41B and can discharge the lubricating oil that has flowed in from the inlets 51 and 56 onto the surface of the turbine rotor 1.

[0055] When the turbine is in an operable state, the first oil supply line 50 of the bearing devices 40A, 40B in this embodiment is connected to a lubricant oil supplier 75 arranged outside the turbine casing 2 via an oil supply pipe 73. Therefore, in this embodiment, when the turbine is operating, lubricant oil from the lubricant oil supplier 75 is supplied between the turbine rotor 1 and the bearings 41A, 41B via the oil supply pipe 73 and the first oil supply line 50 of the bearing devices 40A, 40B.

[0056] Even during the turbine assembly process when the oil supply pipe 73 is not connected to the bearing housings 46A, 46B, the turbine rotor 1 may be rotated to check the relative positional relationship between the turbine rotor 1 and the bearing devices 40A, 40B and the rotational balance of the turbine rotor 1. In this case, if there is no lubricating oil between the turbine rotor 1 and the bearings 41A, 41B, the frictional force between the turbine rotor 1 and the bearings 41A, 41B will increase, placing a great load on the rotation of the turbine rotor 1 and possibly damaging the turbine rotor 1 and the bearings 41A, 41B. For this reason, even when the turbine rotor 1 is rotated during the turbine assembly process, it is necessary to keep lubricating oil between the turbine rotor 1 and the bearings 41A, 41B.

[0057] Therefore, in this embodiment, when the turbine rotor 1 is rotated during the turbine assembly process when the oil supply pipe 73 is not connected to the bearing housings 46A, 46B, lubricating oil can be supplied between the turbine rotor 1 and the bearings 41A, 41B from outside the bearing devices 40A, 40B via the second oil supply line 55 of the bearing devices 40A, 40B. Therefore, in this embodiment, an appropriate amount of lubricating oil can be easily provided between the turbine rotor 1 and the bearings 41A, 41B even during the turbine assembly process.

[0058] (2) The turbine bearing devices 40A and 40B in the second embodiment are The turbine bearing devices 40A, 40B according to the first embodiment further include a plug 72 that can close the inlet 56 of the second oil supply line 55.

[0059] As described above, when the turbine is operating, lubricating oil is supplied from the lubricating oil supplier 75 to the bearing devices 40A, 40B. In this embodiment, when the turbine is operating, the inlet 56 of the second oil supply line 55 is closed with the plug 72. Therefore, in this embodiment, the lubricating oil supplied from the lubricating oil supplier 75 to the bearing devices 40A, 40B when the turbine is operating can be prevented from leaking out of the bearing devices 40A, 40B via the second oil supply line 55.

[0060] (3) The turbine bearing devices 40A and 40B in the third embodiment are In the turbine bearing device 40A, 40B in the first or second embodiment, the first oil supply line 50 has a connection portion to which an oil supply pipe 73 can be connected, which can guide lubricating oil from the outside into the first oil supply line 50.

[0061] (4) The turbine bearing devices 40A and 40B according to the fourth aspect are In the turbine bearing devices 40A, 40B according to any one of the first to third aspects, the bearing housings 46A, 46B have an oil drain line 60 capable of draining lubricating oil from the bearing housings 46A, 46B.

[0062] (5) The turbine bearing devices 40A and 40B according to the fifth aspect are In the turbine bearing devices 40A, 40B according to the fourth aspect, the oil discharge line 60 has a connection portion to which an oil discharge pipe 74 can be connected, which can guide the lubricating oil that has passed through the oil discharge line 60 to the outside.

[0063] (6) The turbine bearing devices 40A and 40B according to the sixth aspect are In the turbine bearing device 40A, 40B according to any one of the first to fifth aspects, the bearings 41A, 41B include a bearing pad 42 having a rotor-facing surface 42p that faces the outer peripheral surface of the turbine rotor 1, and a pad support portion 43 that supports the bearing pad 42 from the radially outer side Dro relative to the central axis Ar. The outlet 57 of the second oil supply line 55 is formed in the pad support portion 43.

[0064] (7) The turbine bearing devices 40A and 40B according to the seventh aspect are In the turbine bearing device 40A, 40B in any one of the first to sixth embodiments, the central axis Ar extends horizontally, and the outlet 57 of the second oil supply line 55 is formed above the central axis Ar.

[0065] The lubricating oil put into the second oil supply line 55 flows out from an outlet 57 of the second oil supply line 55. In this embodiment, because this outlet 57 is formed above the central axis Ar, the lubricating oil that flows out from this outlet 57 falls by gravity and reaches the turbine rotor 1. Furthermore, above the central axis Ar, the weight of the turbine rotor 1 is not applied to the bearings 41A, 41B, so above the central axis Ar, the lubricating oil easily enters between the turbine rotor 1 and the bearings 41A, 41B. Therefore, in this embodiment, the lubricating oil can easily enter between the turbine rotor 1 and the bearings 41A, 41B via the second oil supply line 55.

[0066] The turbine in the above embodiment can be understood as follows, for example. (8) In an eighth aspect, the turbine comprises: The turbine includes a turbine bearing device 40A, 40B according to any one of the first to seventh aspects, the turbine rotor 1, and a turbine casing 2 that covers the turbine rotor 1. The turbine rotor 1 has a rotor shaft 11a, 21a centered on the central axis Ar, and a plurality of rotor blade rows 11b, 21b provided on the outer periphery of the rotor shaft 11a, 21a and aligned in an axial direction Da in which the central axis Ar extends. The bearings 41A, 41B of the bearing device 40A, 40B support regions of the rotor shaft 11a, 21a that are closer to ends De1, De2 in the axial direction Da than the plurality of rotor blade rows 11b, 21b. The bearing housings 46A, 46B each have an outer peripheral plate 47c that covers the outer periphery of the bearings 41A, 41B, and an end side plate 47a that extends from the end of the end side De1, De2 of the outer peripheral plate 47c to the radially inward Dri with respect to the central axis Ar. The inlet 56 of the second oil supply line 55 is formed in the end side plate 47a.

[0067] The turbine of this embodiment includes the bearing devices 40A, 40B according to the above embodiment, so that an appropriate amount of lubricating oil can be easily provided between the turbine rotor 1 and the bearings 41A, 41B even during the turbine assembly process. Furthermore, in this embodiment, an operator can approach the inlet 56 of the second oil supply line 55 from the end sides De1, De2 where the rotor blade rows 11b, 21b are not present. Therefore, in this embodiment, the operation of filling the lubricating oil through the second oil supply line 55 can be easily performed. [Explanation of symbols]

[0068] 1: Gas turbine rotor (or turbine rotor) 2: Gas turbine casing (or turbine casing) 10: Compressor 11: Compressor rotor 11a: Compressor rotor shaft (or rotor shaft) 11b: Moving blade row 12: Compressor casing 12o: Outer casing 12i: Inner casing 13: Strut 15: Air flow path 19: Combustor 20: Turbine 21: Turbine rotor 21a: Turbine rotor shaft (or rotor shaft) 21b: Moving blade row 22: Turbine casing 25: Combustion gas flow path 30: Exhaust casing 31: Casing body 32: Exhaust diffuser 32o: Outer diffuser 32i: Inner diffuser 33: Strut 34: Strut cover 35: Exhaust flow path 39: Intermediate casing 40A: First bearing device 40B: Second bearing device 41A, 41B: Bearings 42: Bearing pad 42p: Rotor facing surface 43: Pad support part 45: Oil spout piping 46A, 46B: Bearing box 47: Box body 47c: Outer plate 47a: End side plate 47b: Moving blade side plate 48: Fuel nozzle 48p: Piping 48f: Flange (connection part) 49: Oil drain nozzle 49p:Plumbing 49f: Flange (connection part) 50: First fuel line 51:Entrance 52:Exit 53: First oil supply passage 55: Second fuel line 56: Entrance 57:Exit 58:Second refueling horizontal channel 59: Second oil supply vertical channel 60: Oil drain line 61: Drain oil flow path 71: Oil syringe 72: Plug 73: Fuel supply pipe 74: Oil drain pipe 75: Lubricating oil supply machine 76: Lubricating oil tank 77: Lubricating oil pump Ar: central axis line Da: Axial direction Dau: Axis upstream side Dad: Downstream of the axis De1: First end side De2: Second end side Dc: Circumferential direction Dr: Radial direction Dro: Radial outer side Dri: Radial inner direction

Claims

1. a bearing that supports the turbine rotor rotatably about a central axis of the turbine rotor; a bearing housing surrounding the bearing; Equipped with the bearing housing and the bearing have a first oil supply line and a second oil supply line that connect from the bearing housing to the bearing, the first oil supply line and the second oil supply line each have an inlet formed in the bearing housing and capable of receiving lubricating oil from outside the bearing housing, and an outlet formed in the bearing and capable of discharging the lubricating oil that has flowed in from the inlet onto a surface of the turbine rotor, the bearing includes a bearing pad having a rotor-facing surface that faces an outer peripheral surface of the turbine rotor, and a pad support portion that supports the bearing pad from an outer side in a radial direction relative to the central axis, Further, a plug capable of closing the inlet of the second fuel supply line is provided, The central axis extends horizontally, The outlet of the second oil supply line is formed in the pad support portion above the central axis. Turbine bearing assembly.

2. In the turbine bearing device according to claim 1, The first oil supply line has a connection portion to which an oil supply pipe capable of guiding lubricating oil from outside into the first oil supply line can be connected. Turbine bearing assembly.

3. In the turbine bearing device according to claim 1 or 2, The bearing housing has an oil drain line that can drain lubricating oil from inside the bearing housing. Turbine bearing assembly.

4. In the turbine bearing device according to claim 3, The oil drain line has a connection part to which an oil drain pipe capable of guiding the lubricating oil that has passed through the oil drain line to the outside can be connected. Turbine bearing assembly.

5. A turbine bearing device according to any one of claims 1 to 4; the turbine rotor; a turbine casing that covers the turbine rotor; Equipped with The turbine rotor includes a rotor shaft centered on the central axis line, and a plurality of rotor blade rows provided on an outer periphery of the rotor shaft and aligned in an axial direction in which the central axis line extends, the bearing of the bearing device supports a region of the rotor shaft that is closer to an end in the axial direction than the plurality of blade rows, The bearing housing has an outer peripheral plate that covers an outer periphery of the bearing, and an end side plate that extends radially inward with respect to the central axis from an end of the outer peripheral plate on the end side, The inlet of the second oil supply line is formed in the end side plate. Turbine.

6. A turbine rotor rotatable about a central axis; a turbine casing that covers the turbine rotor; a bearing device for the turbine rotor; Equipped with The central axis extends horizontally, The turbine rotor includes a rotor shaft centered on the central axis line, and a plurality of rotor blade rows provided on an outer periphery of the rotor shaft and aligned in an axial direction in which the central axis line extends, The bearing device is a bearing that supports the turbine rotor rotatably about the central axis of the turbine rotor; a bearing housing surrounding the bearing; Equipped with the bearing supports a region of the rotor shaft that is closer to an end in the axial direction than the plurality of blade rows, The bearing housing has an outer peripheral plate that covers an outer periphery of the bearing, and an end side plate that extends radially inward with respect to the central axis from an end of the outer peripheral plate on the end side, the bearing housing and the bearing have a first oil supply line and a second oil supply line that connect from the bearing housing to the bearing, the first oil supply line and the second oil supply line each have an inlet formed in the bearing housing and capable of receiving lubricating oil from outside the bearing housing, and an outlet formed in the bearing and capable of discharging the lubricating oil that has flowed in from the inlet onto a surface of the turbine rotor, the bearing includes a bearing pad having a rotor-facing surface that faces an outer peripheral surface of the turbine rotor, and a pad support portion that supports the bearing pad from an outer side in a radial direction relative to the central axis, The inlet of the second oil supply line is formed in the end side plate, The outlet of the second oil supply line is formed in the pad support portion above the central axis. Turbine.

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