Bearing devices for generators, power generation devices, and turbine power generation systems

Abstract

The present invention comprises: a bearing that is configured to rotatably support a rotor of a power generator; a bearing casing that accommodates the bearing; a bearing ring that is provided between the bearing casing and the bearing; an insulation member that is provided between an outer peripheral surface of the bearing ring and an inner surface of the bearing casing; a first pad that is provided to the inner peripheral surface side of the bearing ring and that is disposed so as to face an outer peripheral surface of the bearing with a gap therebetween; and a liner that is sandwiched between the first pad and the inner peripheral surface of the bearing ring.

Description

Technical Field

[0001] The present disclosure relates to a bearing device for a generator, a power generation device, and a turbine power generation system.

Background Art

[0002] Patent Document 1 discloses a bearing device for a rotary machine for suppressing rotational loss with a simple configuration. This bearing device comprises: a casing provided around a rotary shaft; a bearing pad provided opposite to the vertically lower side of the rotary shaft, provided swingably with respect to the casing, forming a lubricating film between the bearing pad and the rotary shaft to support the rotary shaft; and an upper part in the vertical direction of the rotary shaft a fixed pad provided opposite to the side, fixed to the casing, forming a lubricating film between the fixed pad and the rotary shaft, and covering the rotary shaft.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] By the way, when a bearing device for a rotary machine is a bearing device for a generator that rotatably supports a rotor of a generator, if a closed circuit via the bearing device is formed between the rotor and a casing on the stator side or the like, shaft current flows through the closed circuit due to a potential difference between both ends of the shaft of the rotor. Therefore, in order to suppress the shaft current, it is necessary to provide an insulating member in the bearing device on at least one side of the rotor.

[0005] When employing a bearing device for a generator that includes such an insulating member, comprising an annular bearing configured to rotatably support the rotor of the generator, a bearing casing housing the bearing, a bearing ring provided between the bearing casing and the bearing, and an insulating member provided between the outer circumferential surface of the bearing ring and the inner surface of the casing, it is necessary to set an appropriate gap (back gap) between the bearing ring and the bearing from the viewpoint of preventing oil leakage and suppressing rotor runout. In this regard, the bearing device described in Patent Document 1 is not a bearing device for a generator, and does not disclose a configuration for easily adjusting the gap between the bearing ring and the bearing in a generator bearing device that includes an insulating member for suppressing shaft current.

[0006] In view of the circumstances described above, at least one embodiment of the present disclosure aims to provide a generator bearing device, a generator, and a turbine power generation system that include an insulating member for suppressing shaft current, and that allows for easy adjustment of the gap between the bearing ring and the bearing. [Means for solving the problem]

[0007] To achieve the above objective, the generator bearing device according to at least one embodiment of this disclosure is A bearing configured to rotatably support the rotor of a generator, A bearing casing that houses the aforementioned bearing, A bearing ring is provided between the bearing casing and the bearing, An insulating member is provided between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, A first pad is provided on the inner circumferential surface side of the bearing ring and is positioned to face the outer circumferential surface of the bearing with a gap in between, The bearing ring is sandwiched between the inner circumferential surface and the first pad. The thickness and the number of sheets can be adjusted. Raina and, Equipped with, The first pad includes a pad body portion facing the outer circumferential surface of the bearing, and is provided so as to protrude radially from the pad body portion toward the bearing ring. The engagement portion has an axial contact surface that abuts toward the bearing ring in the axial direction and a circumferential contact surface that abuts toward the inner surface of a recess formed on the inner circumferential surface of the bearing ring, thereby suppressing the displacement of the relative position of the first pad with respect to the bearing. . [Effects of the Invention]

[0008] According to at least one embodiment of the present disclosure, a generator bearing device, a generator, and a turbine power generation system are provided that include an insulating material for suppressing shaft current, and that allow for easy adjustment of the gap between the bearing ring and the bearing. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing the general configuration of a turbine power generation system 2 according to one embodiment. [Figure 2] This figure shows an example of a cross-sectional view along the axial direction of the bearing device 6 side of the turbine power generation system 2. [Figure 3] This figure shows an example of a cross-section perpendicular to the axial direction for a part of the bearing device 6. [Figure 4] This figure shows an example of the arrangement of the bearing ring 24 and pad 28, etc., when viewed from the P direction along the axial direction in Figure 2. [Figure 5] This figure shows an example of a cross-section AA. [Figure 6] This figure shows an example of a cross-section perpendicular to the axial direction for a part of the bearing device 8. [Modes for carrying out the invention]

[0010] Hereinafter, several embodiments of this disclosure will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the components described or shown in the drawings as embodiments are not intended to limit the scope of the invention, but are merely illustrative examples. For example, expressions describing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" should not only strictly describe such arrangements, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions indicating that things are equal, such as "identical", "equal" and "homogeneous", shall not only represent a strictly equal state, but also represent a state where there is a tolerance or a difference within a range that allows obtaining the same function. For example, expressions indicating shapes such as a square shape and a cylindrical shape shall not only represent shapes such as a square shape and a cylindrical shape in a strictly geometric sense, but also represent shapes including uneven portions, chamfered portions, and the like within a range that allows obtaining the same effect. On the other hand, the expressions "comprising", "including", "having", or "possessing" a component are not exclusive expressions that exclude the presence of other components.

[0011] Figure 1 is a schematic diagram showing the schematic configuration of a turbine power generation system 2 according to an embodiment. As shown in Figure 1, the turbine power generation system 2 includes a generator 4, a bearing device 6, a bearing device 8, and a turbine 10.

[0012] The generator 4 includes a rotor 12, a stator core 14, and a stator casing 16 that accommodates the rotor 12 and the stator core 14. The stator core 14 and the stator casing 16 constitute a stator.

[0013] The bearing device 6 is configured to rotatably support one end side of the rotor 12 in the axial direction of the generator 4. In the illustrated exemplary embodiment, the bearing device 6 rotatably supports the rotor 12 on a side opposite to the turbine 10 with respect to the rotor 12 in the axial direction of the generator 4.

[0014] The bearing device 8 is configured to rotatably support the other end side of the rotor 12 in the axial direction of the generator 4. In the illustrated exemplary embodiment, the bearing device 8 rotatably supports the rotor 12 on the turbine 10 side with respect to the rotor 12 in the axial direction of the generator 4.

[0015] The turbine 10 is connected to the end of the rotor 12 on the bearing device 8 side, and the rotation of the turbine 10 is transmitted to the rotor 12, causing the rotor 12 to rotate, which in turn causes the generator 4 to generate electricity. The generator 4, bearing device 6, and bearing device 8 constitute the power generation device 3.

[0016] In the following, unless otherwise specified, "axial direction" means the axial direction of the generator 4, i.e., the axial direction of the rotor 12; unless otherwise specified, "radial direction" means the radial direction of the generator 4, i.e., the radial direction of the rotor 12; and unless otherwise specified, "circumferential direction" means the circumferential direction of the generator 4, i.e., the circumferential direction of the rotor 12.

[0017] Figure 2 shows an example of a cross-sectional view along the axial direction of the bearing device 6 in the turbine power generation system 2. Figure 3 shows an example of a cross-sectional view perpendicular to the axial direction of a part of the bearing device 6.

[0018] As shown in at least one of Figures 2 and 3, the bearing device 6 comprises a bearing 20, a bearing casing 22, a bearing ring 24, an insulating member 26, a plurality of pads 28, a plurality of liners 29, and a plurality of bolts 30. Each of the bearing 20, the bearing ring 24, and the insulating member 26 is configured in an annular shape. The axial direction of each of the bearing 20, the bearing ring 24, and the insulating member 26 coincides with or approximately coincides with the axial direction of the rotor 12, the radial direction of each of the bearing 20, the bearing ring 24, and the insulating member 26 coincides with or approximately coincides with the radial direction of the rotor 12, and the circumferential direction of each of the bearing 20, the bearing ring 24, and the insulating member 26 coincides with or approximately coincides with the circumferential direction of the rotor 12. For this reason, the axial, radial, and circumferential directions of the bearing 20, the bearing ring 24, and the insulating member 26 will be simply referred to as "axial direction," "circumferential direction," and "radial direction" below.

[0019] The bearing 20 is configured to rotatably support the rotor 12 on the side of the rotor 12 opposite to the turbine 10 in the axial direction. In the illustrated exemplary embodiment, the bearing 20 is configured in an annular shape to surround the shaft of the rotor 12 and is configured to be divisible into an upper bearing portion 32 and a lower bearing portion 34, with a horizontal plane H1 containing the central axis L1 of the bearing 20 as the boundary.

[0020] The bearing casing 22 houses the bearing 20, bearing ring 24, insulating member 26, and a plurality of pads 28. In the illustrated exemplary embodiment, the bearing casing 22 includes an end bracket 36 and a bearing cap 38 which is separate from the end bracket 36, and the bearing cap 38 is configured to be removable from the end bracket 36.

[0021] The bearing cap 38 has a substantially semi-cylindrical shape and is positioned above the horizontal plane H1 containing the central axis L1 of the bearing 20. The bearing cap 38 is positioned to cover the bearing 20, the bearing ring 24, and the insulating member 26 from above in the vertical direction.

[0022] The end bracket 36 is annular in shape and is configured to house the bearing 20, bearing ring 24, insulating member 26, multiple pads 28, and bearing cap 38. The end bracket 36 has a lubricating oil supply passage (not shown) formed inside and is configured to supply lubricating oil to the bearing 20 through the lubricating oil supply passage. For example, as shown in Figure 2, the end bracket 36 includes a cylindrical portion 40, an inclined wall portion 42, a ring plate portion 44, multiple radial rib portions 46, and a bearing ring support portion 48. The cylindrical portion 40 houses the bearing 20, bearing ring 24, insulating member 26, multiple pads 28, and bearing cap 38, and the inclined wall portion 42 is connected to the end of the cylindrical portion 40 on the generator 4 side. The inclined wall portion 42 is annular in shape and is configured such that the inner and outer diameters of the inclined wall portion 42 decrease as it moves away from the cylindrical portion 40. The inner end of the ring plate portion 44 is connected to the outer surface of the cylindrical portion 40, and the outer end of the ring plate portion 44 is fixed to the stator casing 16. The multiple radial rib portions 46 are multiple flat plate portions arranged radially in an axial view, and each of the multiple radial rib portions 46 is formed in a flat plate shape along a plane perpendicular to the surface of the ring plate portion 44. The radial inner ends of the radial rib portions 46 are connected to the outer surface of the cylindrical portion 40, and the axial ends of the radial rib portions 46 on the generator 4 side are connected to the ring plate portion 44 on the side opposite to the generator 4.

[0023] The bearing ring support portion 48 protrudes radially inward from the lower half of the cylindrical portion 40 and supports the bearing ring 24 from below via the insulating member 26.

[0024] The bearing ring 24 is configured in an annular shape to surround the bearing 20 and is provided between the bearing casing 22 and the bearing 20. The bearing ring 24 is configured to be divisible into an upper half 50 and a lower half 52, with a horizontal plane H2 containing the central axis L2 of the bearing ring 24 as the boundary.

[0025] The insulating member 26 is configured in an annular shape to surround the bearing ring 24. The upper half 26a of the insulating member 26 is provided between the outer circumferential surface 24a of the bearing ring 24 and the inner surface of the bearing casing 22 (in the illustrated example, the inner surface 38a of the bearing cap 38), and the lower half 26b of the insulating member 26 (see Figure 2) is provided between the outer circumferential surface 24a of the bearing ring 24 and the bearing ring support portion 48 of the end bracket 36. The material of the insulating member 26 is not particularly limited, but the insulating member 26 may be, for example, an epoxy resin-impregnated glass cloth laminate, and the insulation resistance of the insulating member 26 is, for example, 1 × 10⁻⁶. 12 It may be Ω or higher.

[0026] For example, as shown in Figure 3, each of the multiple pads 28 is provided on the inner circumferential surface 24b side of the bearing ring 24 and is positioned to face the outer circumferential surface 20a of the bearing 20 with a gap g (back gap) in place when subjected to the load of the rotor 12. In the illustrated exemplary embodiment, the multiple pads 28 include a central pad 28A and a pair of inclined pads 28B, 28C. Each of the central pad 28A and the pair of inclined pads 28B, 28C has the same shape. The central pad 28A is provided at the uppermost position on the inner circumferential surface 24b of the bearing ring 24 so as to intersect a vertical line LA perpendicular to the central axis L2 of the bearing ring 24. The inclined pads 28B are positioned above the central axis L2 of the bearing ring 24 and offset circumferentially from the central pad 28A. The inclined pads 28C are positioned above the central axis L2 of the bearing ring 24 and offset circumferentially from the central pad 28A on the opposite side from the inclined pads 28B. In other words, the central pad 28A is positioned between a pair of inclined pads 28B and 28C in the circumferential direction. Each of the multiple pads 28A to 28C is fastened to the bearing ring 24 by fastening members such as bolts (not shown).

[0027] Each of the surfaces 20h facing the multiple pads 28A to 28C in the bearing 20 is made up of a part of a sphere, and each of the surfaces 28a facing the bearing 20 in the multiple pads 28A to 28C is made up of a part of a sphere.

[0028] The multiple liners 29 include at least one liner 29A sandwiched between the inner circumferential surface 24b of the bearing ring 24 and the central pad 28A, at least one liner 29B sandwiched between the inner circumferential surface 24b of the bearing ring 24 and the inclined pad 28B, and at least one liner 29C sandwiched between the inner circumferential surface 24b of the bearing ring 24 and the inclined pad 28C. Each of the liners 29A to 29C is fixed to the bearing ring 24 by fastening members such as bolts (not shown) that fasten the corresponding pads 28A to 28C to the bearing ring 24 while the liners 29A to 29C are placed on the corresponding pads 28A to 28C.

[0029] Multiple bolts 30 are provided at circumferential intervals and are configured to fasten the bearing ring 24 and the bearing cap 38. In the illustrated exemplary embodiment, each bolt 30 extends radially from the inner circumferential surface side of the bearing ring 24, through the bearing ring 24, to the bearing cap 38.

[0030] Figure 4 shows an example of the arrangement of the bearing ring 24 and pad 28, etc., when viewed along the axial direction from the P direction in Figure 2. Figure 5 shows an example of the AA cross-section in Figure 4.

[0031] As shown in at least one of Figures 3 to 5, each of the pads 28A to 28C includes a pad body portion 58 that includes a surface 28a facing the outer circumferential surface 20a of the bearing 20 (see Figure 3), and an engaging portion 60 that protrudes radially outward from the pad body portion 58 and engages with the bearing ring 24. Note that the configuration of pads 28A to 28C is the same, and in the following description, any mention of simply "pad 28" refers to a description common to pads 28A to 28C.

[0032] As shown in Figure 5, the engaging portion 60 of the pad 28 protrudes radially outward from one axial end 61 of the pad body 58 and engages with the bearing ring 24. As shown in Figure 4, the pad 28 includes a circumferential contact surface 60a (circumferential reference surface) that abuts the bearing ring 24 in a direction along the circumferential direction, and the positioning of the pad 28 in the circumferential direction is achieved by the circumferential contact surface 60a abutting the bearing ring 24.

[0033] As shown in Figure 4, the inner circumferential surface 24b of the bearing ring 24 has multiple recesses 62A, 62B, and 62C formed at intervals in the circumferential direction, into which each of the engaging portions 60 of the multiple pads 28A to 28C is fitted. In the illustrated example, each of the recesses 62A to 62C is a groove formed at one end in the axial direction on the inner circumferential surface 24b of the bearing ring 24. Note that the configuration of the recesses 62A to 62C is the same, and in the following description, any mention of recess 62 simply refers to a description common to recesses 62A to 62C.

[0034] In the illustrated exemplary embodiment, the circumferential contact surface 60a of the engaging portion 60 of the pad 28 contacts the downstream wall surface 62a of the recess 62 in the inner circumferential surface 24b of the bearing ring 24 in the rotation direction R of the rotor 12, thereby positioning the pad 28 in the circumferential direction. The width W1 of the pad 28 in the direction perpendicular to the axial and radial directions is smaller than the width W2 of the recess 62 in the direction perpendicular to the axial and radial directions.

[0035] Furthermore, as shown in Figure 5, the engaging portion 60 of the pad 28 includes an axial contact surface 60b (axial reference surface) that abuts the bearing ring 24 in the axial direction. The axial contact surface 60b abuts against one axial wall surface 62b on the inner surface of the recess 62 of the bearing ring 24, thereby positioning the pad 28 in the axial direction.

[0036] The radial depth D of the recess 62 in the bearing ring 24 is greater than the radial protrusion H from the pad body 58 in the engaging portion 60. Also, if t is the thickness of the liner 29 sandwiched between the pad 28 and the bearing ring 24 (however, if there are multiple liners 29 sandwiched between one pad 28 and the bearing ring 24, the sum of the thicknesses of the multiple liners), then H > t may be satisfied.

[0037] The following describes the effects of the bearing device 6 mentioned above. According to the bearing device 6, the liner 29 sandwiched between the pad 28 provided on the inner diameter side of the bearing ring 24 and the inner circumferential surface 24b of the bearing ring 24 can be easily adjusted by adjusting at least one of the thickness and number of the liner 29, thereby adjusting the gap g between the bearing 20 and the pad 28 (i.e., the gap between the bearing ring 24 and the bearing 20). Therefore, even if an insulating member 26 is provided between the outer circumferential surface 24a of the bearing ring 24 and the inner surface 38a of the bearing casing 22, and a pad cannot be provided between the outer circumferential surface 24a of the bearing ring 24 and the inner surface 38a of the bearing casing 22, the gap between the bearing ring 24 and the bearing 20 can be easily adjusted.

[0038] Furthermore, if the surface 20h of the bearing 20 facing the pad 28 and the surface 28a of the pad 28 facing the bearing 20 are composed of a part of a spherical surface, even a slight shift in the relative position of the pad 28 with respect to the bearing 20 can easily lead to a significant decrease in the bearing performance of the bearing device 6. However, by including an engagement portion 60 in which the pad 28 engages with the bearing ring 24, as in the bearing device 6 described above, the shift in the relative position of the pad 28 with respect to the bearing 20 can be suppressed, thereby stabilizing the bearing performance.

[0039] Furthermore, the circumferential contact surface 60a of the engaging portion 60 contacts the bearing ring 24 in the circumferential direction, thereby positioning the pad 28 in the axial direction. Therefore, even if the surface 20h of the bearing 20 facing the pad 28 and the surface 28a of the pad 28 facing the bearing 20 are each composed of a part of a spherical surface, the displacement of the relative position of the pad 28 in the circumferential direction with respect to the bearing 20 can be suppressed, and the bearing performance can be stabilized.

[0040] Furthermore, the axial contact surface 60b of the engaging portion 60 contacts the bearing ring 24 in the axial direction, thereby positioning the pad 28 in the axial direction. Therefore, even if the surface 20h of the bearing 20 facing the pad 28 and the surface 28a of the pad 28 facing the bearing 20 are each composed of a part of a spherical surface, the axial displacement of the relative position of the pad 28 with respect to the bearing 20 can be suppressed, and the bearing performance can be stabilized.

[0041] Furthermore, the circumferential contact surface 60a abuts against the downstream wall surface 62a of the recess 62 of the bearing ring 24 in the direction of rotation of the rotor 12. Therefore, even when the pad 28 is subjected to a load in the direction of rotation of the rotor 12, the position of the pad 28 is prevented from shifting downstream in the direction of rotation of the rotor 12 by the downstream wall surface 62a of the recess 62 of the bearing ring 24 in the direction of rotation of the rotor 12. As a result, the displacement of the circumferential relative position of the pad 28 with respect to the bearing 20 is effectively suppressed, and the bearing performance can be stabilized.

[0042] Furthermore, by providing a pair of inclined pads 28B and 28C along with the central pad 28A, even if the bearing 20 is subjected to an oblique load intersecting the vertical direction due to vibrations of the rotor 12, the displacement of the bearing 20 can be suppressed by the inclined pads 28B and 28C, thereby stabilizing the bearing performance.

[0043] Figure 6 shows an example of a cross-section perpendicular to the axial direction for a part of the bearing device 8 shown in Figure 1. As shown in Figure 6, the bearing device 8 comprises a bearing 64, a bearing casing 65, a bearing ring 66, multiple pads 67, multiple liners 68, and multiple bolts 69. As shown in Figure 6, no insulating member is provided between the bearing 64 and the bearing casing 70 in the bearing device 8.

[0044] The bearing 64 is configured to rotatably support the rotor 12 on the turbine 10 (see Figure 1) side of the rotor 12 in the axial direction. In the illustrated exemplary embodiment, the bearing 64 is configured in an annular shape to surround the shaft portion of the rotor 12 and is configured to be divisible into an upper bearing portion 74 and a lower bearing portion 75 with respect to a horizontal plane H3 containing the central axis L3 of the bearing 64 as the boundary.

[0045] The bearing casing 65 houses a bearing 64, a bearing ring 66, and a plurality of pads 67. In the illustrated exemplary embodiment, the bearing casing 65 includes an end bracket (not shown) and a bearing cap 70, which is separate from the end bracket and is configured to be removable from the end bracket.

[0046] The bearing cap 70 has a substantially semi-cylindrical shape and is positioned above the horizontal plane H3 containing the central axis L3 of the bearing 64. The bearing cap 70 is positioned to cover the bearing 64 and the bearing ring 66 from above in the vertical direction.

[0047] The bearing ring 66 is configured in an annular shape to surround the bearing 64 and is provided between the bearing casing 65 and the bearing 64. The bearing ring 66 is configured to be divisible into an upper half 76 and a lower half (not shown), with a horizontal plane H4 containing the central axis L4 of the bearing ring 66 as the boundary.

[0048] Each of the multiple pads 67 is provided on the outer circumferential surface 66a side of the bearing ring 66 and is held between the inner circumferential surface of the bearing cap 70 and the outer circumferential surface 66a of the bearing ring 66. In the illustrated exemplary embodiment, the multiple pads 67 include a central pad 67A and a pair of horizontal pads 67B, 67C. The central pad 67A is provided on the top of the outer circumferential surface 66a of the bearing ring 66 so as to intersect a vertical line LB perpendicular to the central axis L4 of the bearing ring 66. The horizontal pads 67B are located on or near a horizontal plane H4 containing the central axis L4 of the bearing ring 66, and the horizontal pads 67C are located on the opposite side of the rotor 12 from the horizontal pads 67B. In the illustrated example, a plurality of recesses 72A, 72B, and 72C are formed on the outer circumferential surface 66a of the bearing ring 66 at intervals in the circumferential direction, and the pads 67A, 67B, and 67C are incorporated into the recesses 72A, 72B, and 72C, respectively.

[0049] The surface 64h of the bearing 64 facing the bearing ring 66 is formed by a part of a spherical surface, and the surface 66i of the bearing ring 66 facing the bearing 64 is formed by a part of a spherical surface.

[0050] The multiple liners 68 include at least one liner 68A sandwiched between the outer circumferential surface 66a of the bearing ring 66 and the central pad 67A, at least one liner 68B sandwiched between the outer circumferential surface 66a of the bearing ring 66 and the horizontal pad 67B, and at least one liner 68C sandwiched between the outer circumferential surface 66a of the bearing ring 66 and the horizontal pad 67C.

[0051] Multiple bolts 69 are provided at circumferential intervals and are configured to fasten the bearing ring 66 and the bearing cap 70. In the illustrated exemplary embodiment, each bolt 69 extends radially from the inner circumferential surface of the bearing ring 66, through the bearing ring 66, to the bearing cap 70.

[0052] As explained above, of the two bearing devices 6 and 8 of the turbine power generation system 2, only the bearing device 6 is equipped with an insulating member 26 between the bearing ring 24 and the bearing casing 22, while the bearing device 8 is not equipped with an insulating member between the bearing ring 66 and the bearing casing 65. For this reason, in the case of the bearing device 8, a pad 67 and a liner 72 can be provided between the bearing ring 66 and the bearing casing 65 of the bearing device 8, and the gap between the bearing 64 and the bearing ring 66 can be easily adjusted by adjusting at least one of the thickness and number of liners 72.

[0053] Thus, in a bearing device 6 equipped with an insulating member 26 between the outer circumferential surface 24a of the bearing ring 24 and the inner surface 38a of the bearing casing 22, and a bearing device 8 not equipped with an insulating member between the outer circumferential surface 66a of the bearing ring 66 and the inner surface of the bearing casing 65, by making the position where the pad is provided different on the inner diameter side of the bearing casing 22 and the outer diameter side of the bearing casing 65, the shaft current can be suppressed with a simple configuration, and the dimension of the gap g between the outer circumferential surface of the bearing and the pad or bearing ring in each of the bearing devices 6 and 8 can be easily adjusted.

[0054] This disclosure is not limited to the embodiments described above, but also includes modified forms of the embodiments described above, as well as forms that combine these forms as appropriate. For example, in the turbine power generation system 2 shown in Figure 1, the arrangement of bearing device 6 and bearing device 8 may be reversed. That is, bearing device 6, which includes an insulating member 26, may be configured to rotatably support the rotor on the turbine side of the generator 4, while bearing device 8, which does not include an insulating member, may be configured to rotatably support the rotor on the opposite side of the generator 4 from the turbine.

[0055] Furthermore, for example, in the embodiment described above, the engaging portion 60 of the pad 28 was configured to protrude radially outward from the pad body 58 and engage with the recess 62 of the bearing ring 24. However, in other embodiments, the engaging portion may be a recess formed on the radially outer surface of the pad body. In this case, the bearing ring may have a convex portion configured to protrude radially inward from the inner circumferential surface of the bearing ring and engage with the recess of the pad body. In this case, the inner surface of the recess formed in the pad body may include a circumferential contact surface that abuts the bearing ring in a direction along the circumferential direction of the bearing ring, and an axial contact surface that abuts the bearing ring in the axial direction of the bearing ring.

[0056] The contents described in each of the above embodiments can be understood, for example, as follows:

[0057] (1) A bearing device for a generator according to at least one embodiment of the present disclosure (for example, the bearing device 6 described above) A bearing (e.g., the bearing 20 described above) configured to rotatably support the rotor (e.g., the rotor 12 described above) of a generator (e.g., the generator 4 described above), A bearing casing (for example, the bearing casing 22 described above) that houses the bearing, A bearing ring (for example, the bearing ring 24 described above) is provided between the bearing casing and the bearing, An insulating member (for example, the insulating member 26 described above) is provided between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, A first pad (for example, the pads 28, 28A, 28B, or 28C described above) is provided on the inner diameter side of the bearing ring and is positioned to face the outer circumferential surface of the bearing with a gap between them, A liner (for example, the liner 29 described above) sandwiched between the inner circumferential surface of the bearing ring and the first pad, It is equipped with.

[0058] According to the generator bearing device described in (1) above, the gap between the bearing ring and the bearing (i.e., the gap between the bearing and the pad) can be easily adjusted by adjusting at least one of the thickness and number of liners sandwiched between the pad provided on the inner diameter side of the bearing ring and the inner circumferential surface of the bearing ring. For this reason, even if an insulating member for suppressing axial current is provided between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, and therefore a pad cannot be provided between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, the gap between the bearing and the bearing ring can be easily adjusted.

[0059] (2) In some embodiments, in the generator bearing device described in (1) above, The surface of the bearing facing the first pad (for example, the surface 20h described above) is formed by a part of a spherical surface. The surface of the first pad facing the bearing (for example, the surface 28a described above) is formed by a part of a spherical surface. The first pad includes an engaging portion (for example, the engaging portion 60 described above) that engages with the bearing ring.

[0060] When the surface of the bearing facing the first pad and the surface of the first pad facing the bearing are each composed of a part of a spherical surface, even a slight misalignment of the relative position of the first pad with respect to the bearing can easily lead to a significant decrease in bearing performance. However, as described in (2) above, by including an engagement portion in the first pad that engages with the bearing ring, the misalignment of the relative position of the first pad with respect to the bearing can be suppressed, thereby stabilizing bearing performance.

[0061] (3) In some embodiments, in the generator bearing device described in (2) above, The engaging portion includes an axial contact surface (for example, the axial contact surface 60b described above) that contacts the bearing ring in the axial direction of the bearing ring.

[0062] According to the generator bearing device described in (3) above, the axial contact surface of the engaging portion contacts the bearing ring in the axial direction of the bearing ring, thereby positioning the first pad in the axial direction of the bearing ring. Therefore, even if the surface of the bearing facing the first pad and the surface of the first pad facing the bearing are each composed of a part of a spherical surface, the displacement of the axial relative position of the first pad with respect to the bearing can be suppressed, and the bearing performance can be stabilized.

[0063] (4) In some embodiments, in the generator bearing device described in (3) above, The first pad includes a pad body portion (for example, the pad body portion 58 described above) that faces the outer circumferential surface of the bearing, and the engaging portion is provided to protrude radially from the pad body portion toward the bearing ring.

[0064] According to the generator bearing device described in (4) above, the axial contact surface provided on the engaging portion that protrudes radially from the pad body portion of the bearing ring contacts the bearing ring in the axial direction, thereby positioning the first pad in the axial direction of the bearing ring. Therefore, even if the surface of the bearing facing the first pad and the surface of the first pad facing the bearing are each composed of a part of a spherical surface, the displacement of the axial relative position of the first pad with respect to the bearing can be suppressed, and the bearing performance can be stabilized.

[0065] (5) In some embodiments, in the generator bearing device described in (2) above, The engaging portion includes a circumferential contact surface (for example, the circumferential contact surface 60a described above) that contacts the bearing ring in a direction along the circumferential direction of the bearing ring.

[0066] According to the generator bearing device described in (5) above, the circumferential contact surface of the engaging portion contacts the bearing ring in a direction along the circumferential direction of the bearing ring, thereby positioning the first pad in the circumferential direction of the bearing ring. Therefore, even if the surface of the bearing facing the first pad and the surface of the first pad facing the bearing are each composed of a part of a spherical surface, the displacement of the relative position of the first pad in the circumferential direction with respect to the bearing can be suppressed, and the bearing performance can be stabilized.

[0067] (6) In some embodiments, in the generator bearing device described in any of (2) to (5) above, A recess (for example, the recesses 62A, 62B, or 62C described above) is formed on the inner circumferential surface of the bearing ring. The circumferential contact surface contacts the inner surface of the recess of the bearing ring.

[0068] According to the generator bearing device described in (6) above, the circumferential contact surface of the engaging portion contacts the inner surface of the recess of the bearing ring in a direction along the circumferential direction of the bearing ring, thereby positioning the first pad in the circumferential direction of the bearing ring. For this reason, even if the surface of the bearing facing the first pad and the surface of the first pad facing the bearing are each composed of a part of a spherical surface, the displacement of the relative position of the first pad in the circumferential direction with respect to the bearing can be suppressed, and the bearing performance can be stabilized.

[0069] (7) In some embodiments, in the generator bearing device described in any of (1) to (6) above, The circumferential contact surface contacts the inner surface of the recess of the bearing ring, specifically the wall surface on the downstream side in the direction of rotation of the rotor (for example, the wall surface 62a described above).

[0070] According to the generator bearing device described in (7) above, even when the first pad is subjected to a load in the direction of rotor rotation, the displacement of the first pad's position downstream in the direction of rotor rotation can be suppressed by the downstream wall surface of the recess of the bearing ring in the direction of rotor rotation. Therefore, the displacement of the circumferential relative position of the first pad with respect to the bearing can be effectively suppressed, and the bearing performance can be stabilized.

[0071] (8) In some embodiments, in the generator bearing device described in any of (1) to (7) above, A pair of inclined pads (for example, the inclined pads 28B and 28C described above) are provided on the inner circumferential surface side of the bearing ring and are arranged to face the outer circumferential surface of the bearing with a gap between them, A liner (for example, the liners 29B and 29C described above) is sandwiched between the inner circumferential surface of the bearing ring and each of the pair of inclined pads, Furthermore, The first pad is positioned between the pair of inclined pads in the circumferential direction of the bearing ring.

[0072] According to the generator bearing device described in (8) above, even if the bearing is subjected to an oblique load intersecting the vertical direction due to rotor vibration or the like, the displacement of the bearing can be suppressed by the inclined pad, thereby stabilizing the bearing performance.

[0073] (9) A bearing device for a generator according to at least one embodiment of the present disclosure A first bearing device (e.g., the bearing device 6 described above) configured to rotatably support one end of the rotor of the generator, A second bearing device (for example, the bearing device 8 described above) is configured to rotatably support the other end of the rotor, Equipped with, The first bearing device is a generator bearing device as described in any of (1) to (8) above, The second bearing device is A bearing (for example, the bearing 64 described above) configured to rotatably support the other end of the rotor of the generator, The bearing casing (for example, the bearing casing 65 described above) of the second bearing device, A bearing ring (for example, the bearing ring 66 described above) is provided between the bearing casing of the second bearing device and the bearing of the second bearing device, A pad (for example, the pad 67 described above) sandwiched between the outer circumferential surface of the bearing ring of the second bearing device and the inner surface of the bearing casing of the second bearing device, A liner (for example, the liner 68 described above) sandwiched between the outer circumferential surface of the bearing ring of the second bearing device and the pad, It is equipped with.

[0074] According to the generator bearing device described in (9) above, of the first and second bearing devices, only the first bearing device is provided with an insulating member between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, while the second bearing device is not provided with an insulating member between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing. For this reason, for the second bearing device, a pad and a liner can be provided between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, and the gap between the bearing and the pad can be easily adjusted by adjusting at least one of the thickness and number of liners. Thus, in a first bearing device that includes an insulating member between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, and a second bearing device that does not include an insulating member between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, by making the position where the pad is provided different on the inner diameter side and the outer diameter side of the bearing casing, the shaft current can be suppressed with a simple configuration, and the dimension of the gap between the outer circumferential surface of the bearing and the pad or bearing ring in each of the first and second bearing devices can be easily adjusted.

[0075] (10) A turbine power generation system according to at least one embodiment of the present disclosure The power generation device described in (9) above, A turbine (for example, the turbine 10 described above) connected to the rotor of the generator, Equipped with, The first bearing device is configured to support the rotor on the side of the rotor opposite to the turbine in the axial direction of the generator.

[0076] In a typical turbine power generation system, the first bearing device that supports the rotor on the opposite side of the turbine in the axial direction of the generator is provided with an insulating member between the outer surface of the bearing ring and the inner surface of the bearing casing. Therefore, as described in (10) above, by using the power generation device described in (9) above in such a typical turbine power generation system, the shaft current can be suppressed with a simple configuration while the clearance between the bearing and the pad can be easily adjusted. [Explanation of Symbols]

[0077] 2. Turbine power generation system 28.67 pads 3. Power generation equipment 4 Generators 6.8 Bearing device (Bearing device for generator) 10 Turbines 12 rotors 14 Stator core 16 Stator casing 20,64 bearings 20a, 24a, 66a outer surface 20h,28a,64h,66i surface 22.65 Bearing casing 24,66 bearing rings 24b Inner surface 26 Insulating material 26a upper half 26b Lower half 28A, 67A Center Pad 28B, 28C Incline direction pad 29, 29A, 29B, 29C, 68, 68A, 68B, 68C Liner 30.69 volts 32,74 Upper part of the bearing 34,75 Bearing lower half 36 End Bracket 38,70 Bearing cap 38a Inner surface 40 Cylindrical section 42 Slanted wall section 44 Ring plate section 46 Radial rib section 48 Bearing ring support section 50,76 Upper half of bearing ring 52 Lower half of bearing ring 58 Pad main body 60 Engaging part 60a Circumferential contact surface 60b Axial contact surface 61 End 62, 62A, 62B, 62C, 72A, 72B, 72C recessed 62a, 62b Wall surface 67B, 67C Horizontal Pad

Claims

1. A bearing configured to rotatably support the rotor of a generator, A bearing casing that houses the aforementioned bearing, A bearing ring is provided between the bearing casing and the bearing, An insulating member is provided between the outer circumferential surface of the bearing ring and the inner surface of the bearing casing, A first pad is provided on the inner circumferential surface side of the bearing ring and is arranged to face the outer circumferential surface of the bearing with a gap in between, A liner is sandwiched between the inner circumferential surface of the bearing ring and the first pad, and whose thickness and number of layers can be adjusted. Equipped with, The first pad includes a pad body portion facing the outer circumferential surface of the bearing, and is provided so as to protrude radially from the pad body portion toward the bearing ring. The engagement portion has an axial contact surface that abuts toward the bearing ring in the axial direction and a circumferential contact surface that abuts toward the inner surface of a recess formed on the inner circumferential surface of the bearing ring, thereby suppressing the displacement of the relative position of the first pad with respect to the bearing.

2. The bearing device for a generator according to Claim 1, characterized in that the amount of radial protrusion from the pad body is greater than the thickness of the liner.

3. The bearing device for a generator according to claim 1, wherein the circumferential contact surface contacts the downstream wall surface of the inner surface of the recess of the bearing ring in the direction of rotation of the rotor.

4. A pair of inclined pads are provided on both sides of the first pad on the inner circumferential surface side above the central axis of the bearing ring, and are arranged to face the outer circumferential surface of the bearing with a gap between them, A liner sandwiched between the inner circumferential surface of the bearing ring and each of the pair of inclined pads, The generator bearing device according to claim 1, further comprising the above.

5. A first bearing device configured to rotatably support one end of the rotor of a generator, A second bearing device configured to rotatably support the other end of the rotor, Equipped with, The first bearing device is a generator bearing device according to any one of claims 1 to 4, The second bearing device is An annular bearing configured to rotatably support the other end of the rotor of the generator, A bearing casing for housing the bearing of the second bearing device, A bearing ring is provided between the bearing casing of the second bearing device and the bearing of the second bearing device, A pad sandwiched between the outer circumferential surface of the bearing ring of the second bearing device and the inner surface of the bearing casing of the second bearing device, A liner sandwiched between the outer circumferential surface of the bearing ring of the second bearing device and the pad, A power generation device equipped with the following features.

6. The power generation device according to claim 5, A turbine connected to the rotor of the generator, Equipped with, The first bearing device is configured to support the rotor on the side of the rotor opposite to the turbine in the axial direction of the generator in a turbine power generation system.

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