Seal device and rotary machine

Abstract

To provide a seal device and a rotary machine having the seal device, capable of restraining an inclination of the seal device, by improving moment balance of the seal device.SOLUTION: A seal device for sealing a first gap formed between a rotary member of a rotary machine and a stationary member disposed on an outer side of the rotary member in a radial direction, the seal device comprising a plurality of seal segments disposed side by side in a circumferential direction in the first gap and partitioning the first gap into a high-pressure side region and a low-pressure side region in an axial direction, the plurality of seal segments include a movable seal segment including a movable seal member and a holding member that supports the movable seal member so as to be movable along a radial direction, and a one side seal segment adjacent to the movable seal segment on one side in a circumferential direction, and are configured to be capable of transmitting a rotational moment such that a high-pressure side region side of the movable seal member is directed inward in the radial direction between the holding member of the movable seal segment and the one side seal segment.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a sealing device and a rotary machine. [Background technology]

[0002] BACKGROUND ART A sealing device having a structure in which a movable sealing member can move radially depending on the operating state of the rotary machine, etc., is sometimes used as a sealing device for reducing fluid leakage through gaps between rotating and stationary members in rotary machines such as gas turbines and steam turbines.

[0003] In the sealing device (self-adjusting seal) described in Patent Document 1, movable sealing members (movable seal rings) are arranged above and below the rotating member in an annular gap between the rotating member and a stationary member, and fixed sealing members (fixed seal rings) are arranged on each side of the rotating member in the gap. In Patent Document 1, the movable sealing members arranged above and below the rotating member are configured to be movable in the vertical direction (radial direction) depending on the operating state of the rotary machine, etc.

[0004] In the sealing device described in Patent Document 1, when the rotary machine is in a start-stop operation or is stopped, the elastic member biases the movable seal member radially outward, maintaining a large clearance between the rotating member and the movable seal member. Meanwhile, when the rotary machine is in a loaded operation, the pressure of the high-pressure working fluid acts on the outer peripheral surface of the movable seal member, applying a radially inward force to the movable seal member (i.e., a force that resists the biasing force of the elastic member). This displaces the movable seal member radially inward compared to when the rotary machine is in a start-stop operation or the like, maintaining a small clearance between the rotating member and the movable seal member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2023 / 157519 Summary of the Invention [Problem to be solved by the invention]

[0006] According to the inventors' new findings, if the arc angle of the seal ring is small, the pressure of the fluid flowing around the seal ring will act as a rotational moment that tilts the seal ring radially inward, which may cause the seal ring to tilt. In the seal device described in Patent Document 1, the arc angle of the stationary seal ring is small, so there is a risk that the stationary seal ring may tilt.

[0007] In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a sealing device that can improve the moment balance of the sealing device and suppress tilting of the sealing device, and a rotary machine equipped with the sealing device. [Means for solving the problem]

[0008] A sealing device according to at least one embodiment of the present disclosure comprises: A sealing device for sealing a first gap formed between a rotary member of a rotary machine and a stationary member arranged radially outward of the rotary member, a plurality of seal segments arranged side by side in the circumferential direction of the rotary member in the first gap, the plurality of seal segments dividing the first gap in the axial direction of the rotary member into a high-pressure side region through which a high-pressure fluid flows and a low-pressure side region through which a low-pressure fluid flows; the plurality of seal segments include a movable seal segment and a one-side seal segment adjacent to the movable seal segment on one side in the circumferential direction, The movable seal segment a movable seal member extending in the circumferential direction in the first gap; a holding member for supporting the movable seal member disposed on the radially inner side so as to be movable along the radial direction; at least one biasing device configured to bias the movable seal member radially outward relative to the retaining member along the radial direction; The holding member of the movable seal segment is configured to be able to transmit a rotational moment to the one-side seal segment such that the high-pressure side region of the movable seal member faces inward in the radial direction.

[0009] A rotary machine according to at least one embodiment of the present disclosure includes: The sealing device; The rotating member; The stationary member. [Effects of the Invention]

[0010] According to at least one embodiment of the present disclosure, there are provided a seal device that can improve the moment balance of the seal device and suppress tilting of the seal device, and a rotary machine including the seal device. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic cross-sectional view of a first gap and its vicinity in a rotary machine according to an embodiment of the present disclosure, viewed from one side in the axial direction. [Figure 2] 1 is a schematic cross-sectional view of a seal device according to an embodiment of the present disclosure, taken along an axial direction; [Figure 3] 1 is a schematic cross-sectional view of a seal device according to an embodiment of the present disclosure, taken along an axial direction; [Figure 4] 10A and 10B are explanatory diagrams for explaining a rotational moment acting on a seal segment in one embodiment of the present disclosure. [Figure 5] 10 is a graph illustrating the relationship between the angle of the seal segment and the rotational moment in one embodiment of the present disclosure. [Figure 6] 1 is a schematic view of a sealing device according to an embodiment of the present disclosure, viewed from one side in the axial direction. [Figure 7] FIG. 7 is a schematic cross-sectional view of the seal device shown in FIG. 6 taken along the circumferential direction. [Figure 8] 1 is a schematic view of a sealing device according to an embodiment of the present disclosure, viewed from one side in the axial direction. [Figure 9]FIG. 9 is a schematic cross-sectional view of the seal device shown in FIG. 8 taken along the circumferential direction. [Figure 10] 1 is a schematic cross-sectional view of a sealing device according to an embodiment of the present disclosure taken along a circumferential direction. [Figure 11] 1 is a schematic cross-sectional view of a first gap and its vicinity in a rotary machine according to an embodiment of the present disclosure, viewed from one side in the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. "Extending along a certain direction" is not limited to extending in a certain direction, but also includes extending in a direction inclined within a predetermined angle (e.g., ±10°) relative to the certain direction.

[0013] (Rotating Machinery) Fig. 1 is a schematic cross-sectional view of a first gap G1 and its vicinity of a rotary machine 10 according to an embodiment of the present disclosure, viewed from one axial side. As shown in Fig. 1, the rotary machine 10 according to some embodiments includes a rotary member 11 and a stationary member 12 disposed radially outward of the rotary member 11. A first gap G1 is formed between the rotary member 11 and the stationary member 12. Examples of the rotary machine 10 according to the present disclosure include a gas turbine and a steam turbine.

[0014] The rotating member 11 is configured to rotate about a rotation axis RA (radial center) when the rotating machine 10 is driven. The rotating member 11 includes at least a rotating shaft 11A that extends along the rotation axis RA and is configured to rotate about the rotation axis RA (radial center). Note that the rotating member 11 may further include another member that is fixed to the rotating shaft 11A and rotates about the rotation axis RA (radial center) in conjunction with the rotation of the rotating shaft 11A.

[0015] Hereinafter, the direction in which the rotation axis RA of the rotating member 11 extends is defined as the axial direction of the rotating member 11 (rotating machine 10), the direction perpendicular to the rotation axis RA is defined as the radial direction of the rotating member 11 (rotating machine 10), and the circumferential direction around the rotation axis RA is defined as the circumferential direction of the rotating member 11 (rotating machine 10). Hereinafter, the axial direction, radial direction, and circumferential direction of the rotating member 11 (rotating machine 10) may be simply referred to as the axial direction, radial direction, and circumferential direction.

[0016] The stationary member 12 is configured to remain stationary (not rotate) even when the rotating member 11 rotates when the rotating machine 10 is driven. The stationary member 12 includes at least a housing 12A configured to rotatably accommodate the rotating member 11. The stationary member 12 may further include other members fixed to the housing 12A. The housing 12A may accommodate and support a bearing (not shown) that rotatably supports the rotating member 11.

[0017] The rotating member 11 has a rotating-side outer peripheral surface 111 that defines a first gap G1. The stationary member 12 has a stationary-side inner peripheral surface 121 that defines the first gap G1. The rotating-side outer peripheral surface 111, the stationary-side inner peripheral surface 121, and the first gap G1 are formed in an annular shape extending along the circumferential direction of the rotating machine 10. The rotating-side outer peripheral surface 111 is provided radially outward of the stationary-side inner peripheral surface 121 and faces the stationary-side inner peripheral surface 121 across the annular first gap G1. The first gap G1 is a radial gap formed between the rotating-side outer peripheral surface 111 and the stationary-side inner peripheral surface 121.

[0018] (Sealing device) A seal device 1 according to some embodiments is a seal structure that is provided in a rotary machine 10 and seals a first gap G1 to suppress fluid leakage through the first gap G1. As shown in FIG. 1 , the seal device 1 includes a plurality of seal segments 2 that are arranged side by side in the circumferential direction of the rotary member 11 in the first gap G1. Each of the plurality of seal segments 2 is formed in an arc shape that extends along the circumferential direction of the rotary member 11. In the illustrated embodiment, the plurality of seal segments 2 includes at least one movable seal segment 21, a first-side seal segment 22 adjacent to one side of the movable seal segment 21 in the circumferential direction (counterclockwise in the illustrated example), and an other-side seal segment 23 adjacent to the other side of the movable seal segment 21 in the circumferential direction (clockwise in the illustrated example).

[0019] 1 shows a horizontal line HL that passes through the rotation axis RA and extends horizontally, and a vertical line VL that passes through the rotation axis RA and extends vertically. In the embodiment shown in Fig. 1, the at least one movable seal segment 21 described above includes an upper movable seal segment 21A that is provided above the horizontal line HL and a lower movable seal segment 21B that is provided below the horizontal line HL. The upper movable seal segment 21A and the lower movable seal segment 21B are each provided in a circumferential range that includes the vertical line VL.

[0020] 1, the multiple seal segments 2 include a one-side seal segment 22A adjacent to the one circumferential side of the upper movable seal segment 21A, and an other-side seal segment 23A adjacent to the other circumferential side of the upper movable seal segment 21A. At least a portion (in the illustrated example, the entirety) of each of the one-side seal segment 22A and the other-side seal segment 23A is provided above the horizontal line HL.

[0021] 1, the multiple seal segments 2 include a one-side seal segment 22B adjacent to the one circumferential side of the lower movable seal segment 21B, and an other-side seal segment 23B adjacent to the other circumferential side of the lower movable seal segment 21B. At least a portion (in the illustrated example, the entirety) of each of the one-side seal segment 22B and the other-side seal segment 23B is located below the horizontal line HL. In the following embodiment, the upper movable seal segment 21A will be described as a specific example of the movable seal segment 21, but the present disclosure is also applicable to cases where the movable seal segment 21 is the lower movable seal segment 21B.

[0022] 1, each of the one-side seal segments 22A, 22B and the other-side seal segments 23A, 23B is a fixed seal segment including a fixed seal member 6 that is immovable in the radial direction relative to the stationary member 12. The immovability of the fixed seal segments means that the fixed seal segments do not have a structure in which the movable seal member 3 is movable in the radial direction depending on the operating state of the rotary machine 10, as in the movable seal segments, but allow the fixed seal member 6 to move within the groove 13 formed in the stationary member 12. The present disclosure is also applicable to a case in which each of the one-side seal segments 22A, 22B and the other-side seal segments 23A, 23B is a movable seal segment including a movable seal member 3 that is movable in the radial direction relative to the stationary member 12.

[0023] (groove) 2 and 3 are schematic cross-sectional views along the axial direction of a seal device 1 according to an embodiment of the present disclosure. FIG. 2 shows a cross-section at a circumferential position including a movable seal segment 2 (movable seal segment 21) of the seal device 1. FIG. 3 shows a cross-section at a circumferential position including fixed seal segments 2 (one-side seal segment 22, the other-side seal segment 23) of the seal device 1. As shown in FIGS. 2 and 3, an arc-shaped or annular groove 13 extending along the circumferential direction is formed on the stationary-side inner circumferential surface 121 of the stationary member 12. The groove 13 is recessed radially outward from the stationary-side inner circumferential surface 121.

[0024] In the illustrated embodiment, as shown in Figures 2 and 3, the groove 13 includes a first groove portion 14 and a second groove portion 15 provided radially outward of the first groove portion 14. The second groove portion 15 communicates with the first gap G1 via the first groove portion 14. The second groove portion 15 has a larger diameter toward one axial side (the left side in Figure 2) than the first groove portion 14. As shown in Figures 2 and 3, the stationary member 12 has a one-side protrusion 16 that protrudes toward the other axial side beyond the wall surface of the second groove portion 15 on the one axial side. A portion of the first groove portion 14 is defined by the one-side protrusion 16.

[0025] (Seal segment) Each of the multiple seal segments 2 is configured to divide the first gap G1 into a high-pressure side region PS1 in which a high-pressure fluid flows in the axial direction of the rotating member 11, and a low-pressure side region PS2 in which a low-pressure fluid with a lower pressure than the high-pressure fluid flows.

[0026] (movable seal segment) 2, the above-mentioned movable seal segment 21 (movable seal segment 2) includes a movable seal member 3, a holding member 4, and at least one biasing device 5. In the embodiment shown in FIG. 1, the movable seal segment 21 includes a plurality of biasing devices 5 (eight in the illustrated example).

[0027] (movable seal member) 2, the movable seal member 3 includes a main body portion 31 provided in the first gap G1 and a plurality of seal fins 32. Each of the plurality of seal fins 32 is formed in a thin plate shape that protrudes from an inner peripheral surface facing the rotation-side outer peripheral surface 111 of the main body portion 31 toward the rotation-side outer peripheral surface 111. The main body portion 31 and the plurality of seal fins 32 have an arc shape that extends along the circumferential direction. The movable seal member 3 exhibits a labyrinth effect between the plurality of seal fins 32 and the rotation-side outer peripheral surface 111 of the rotating member 11, suppressing leakage of fluid (steam if the rotating machine 10 is a steam turbine) between the movable seal member 3 and the rotating member 11.

[0028] The first gap G1 has a higher pressure on one axial side (the left side in FIG. 2) than on the other axial side (the right side in FIG. 2) of the movable seal member 3. In other words, the first gap G1 includes a high-pressure side region PS1, which is located on the one axial side of the movable seal member 3 and through which the high-pressure fluid flows, and a low-pressure side region PS2, which is located on the other axial side of the movable seal member 3 and through which the low-pressure fluid flows.

[0029] (holding member) 2, the holding member 4 supports the movable seal member 3 arranged radially inside so as to be movable along the radial direction. The holding member 4 is supported by the stationary member 12. The holding member 4 includes at least a base 41 accommodated in the groove 13 described above, and an inner flange 42 protruding inward from the inner circumferential surface of the radially inner end of the base 41.

[0030] The base 41 has an arc shape extending circumferentially so as to cover the radial outside of the main body 31 of the movable seal member 3. The base 41 is configured to accommodate the biasing device 5 in an internal space 43 formed by its inner circumferential surface. The inner flange 42 extends in a direction intersecting the radial direction and has an annular shape when viewed from one radial side. The radially outer surface of the inner flange 42 of the holding member 4 forms an abutment surface 421 against which the biasing member 51 arranged radially outward abuts.

[0031] 2, the retaining member 4 includes a radial protrusion 44 that protrudes radially inward from the base 41. The radial protrusion 44 is provided on the other axial side of the central axis CL of the groove 13 (second groove portion 15). The main body 31 of the movable seal member 3 described above has a sliding surface 311 that is adjacent to the radial protrusion 44 in the axial direction and is slidable against the radial protrusion 44.

[0032] During load operation of the rotary machine 10, the pressure of the fluid flowing through the high-pressure side region PS1 acts on the end face on one axial side of the main body 31, thereby applying a force in the other axial direction to the movable seal member 3. As a result, the sliding surface 311 abuts on the surface on one axial side of the radial protrusion 44. Furthermore, the surface on the other axial side of the radial protrusion 44 abuts on the end face that defines the groove 13. By sliding the radial protrusion 44 against the sliding surface 311, the operation of the movable seal member 3 when it moves in the radial direction can be stabilized.

[0033] (energizing device) As shown in Fig. 2, the biasing device 5 includes at least a biasing member 51 for biasing the movable seal member 3 radially outward relative to the holding member 4. In the illustrated embodiment, as shown in Fig. 2, the biasing device 5 further includes a head portion 52 housed in the internal space 43 of the holding member 4, and a shaft portion 53 connecting the head portion 52 and the main body portion 31 of the movable seal member 3. In this case, the biasing device 5 can cause the biasing member 51 to exert a biasing force with a simple structure.

[0034] 2, the head 52 has a larger diameter than the shaft 53. The head 52 has a contact surface 521 against which the radially outer surface of the biasing member 51 contacts. The shaft 53 extends radially, with one end connected to the head 52 and the other end connected to the main body 31 of the movable seal member 3 radially inward of the inner flange 42. The inner circumferential surface of the inner flange 42 forms an insertion hole through which the shaft 53 is inserted.

[0035] The biasing member 51 is disposed between the contact surface 521 of the head 52 and the above-mentioned contact surface 421 that faces the contact surface 521 via a radial gap, with one end abutting against the contact surface 521 and the other end abutting against the contact surface 421. In the embodiment shown in Fig. 2, the biasing member 51 is disposed so as to cover the outer periphery of the shaft portion 53. Examples of the biasing member 51 include a compression coil spring and a disc spring.

[0036] When the rotary machine 10 is in a start-stop operation or is stopped, the movable seal member 3 is urged radially outward by the multiple urging devices 5, so that a large clearance is maintained between the rotating member 11 and the main body 31 of the movable seal member 3. On the other hand, when the rotary machine 10 is in a load operation, the pressure of the fluid flowing through the high-pressure side region PS1 acts on the outer circumferential surface of the main body 31, applying a radially inward force (i.e., a force that resists the urging force of the urging devices 5) to the movable seal member 3. As a result, the movable seal member 3 is displaced radially inward compared to when the rotary machine 10 is in a start-stop operation or the like, so that a small clearance is maintained between the rotating member 11 and the main body 31 of the movable seal member 3.

[0037] (Fixed seal segment) As shown in FIG. 3 , each of the first seal segment 22 and the second seal segment 23 (fixed seal segment 2) includes a stationary seal member 6. The stationary seal member 6 includes a main body 61 provided in the first gap G1 and a plurality of seal fins 62. The main body 61 is supported by the stationary member 12. The radially outer end of the main body 61 is housed in the groove 13. Each of the plurality of seal fins 62 is formed in a thin plate shape that protrudes from an inner circumferential surface facing the rotation-side outer circumferential surface 111 of the main body 61 toward the rotation-side outer circumferential surface 111. The main body 61 and the plurality of seal fins 62 have an arc shape extending along the circumferential direction. The stationary seal member 6 exhibits a labyrinth effect between the plurality of seal fins 62 and the rotation-side outer circumferential surface 111 of the rotating member 11, thereby suppressing leakage of fluid (steam, if the rotary machine 10 is a steam turbine) between the stationary seal member 6 and the rotating member 11.

[0038] The first gap G1 has a higher pressure on one axial side (left side in FIG. 3) than on the other axial side (right side in FIG. 3) of the fixed seal member 6. In other words, the first gap G1 includes a high-pressure side region PS1, which is located on the one axial side of the fixed seal member 6 and through which the high-pressure fluid flows, and a low-pressure side region PS2, which is located on the other axial side of the fixed seal member 6 and through which the low-pressure fluid flows.

[0039] In the illustrated embodiment, the axial length of the main body 31 of the movable seal member 3 on the one side in the axial direction from the central axis CL of the groove 13 is greater than the axial length of the main body 61 of the fixed seal member 6 on the one side in the axial direction from the central axis CL of the groove 13. The axial length of the other side in the direction of the arrow is greater than the axial length of the other side in the direction of the arrow.

[0040] FIG. 4 is an explanatory diagram illustrating the rotational moment acting on the seal segment 2 in one embodiment of the present disclosure. In FIG. 4, the center of gravity of the seal segment 2 is designated as CG. One end 221 and the other end 222 in the circumferential direction of the seal segment 2 each contact the end of the circumferentially adjacent seal segment 2. A rotational moment acts on the seal segment 2 due to the pressure of the fluid flowing around the seal segment 2. As shown in FIG. 4, the direction of the rotational moment acting on the seal segment 2, which acts radially inward in the high-pressure side region PS1, is defined as the positive direction.

[0041] FIG. 5 is a graph illustrating the relationship between the angle of the seal segment 2 and the rotational moment in one embodiment of the present disclosure. In FIG. 5, the horizontal axis represents the angle θ of the seal segment 2, and the vertical axis represents the rotational moment. As shown in FIG. 1, the seal segment angle θ is the angle of the arc formed by the seal segment 2, i.e., the angle from one end 211 to the other end 212 in the circumferential direction of the seal segment 2. When the seal device 1 shown in FIG. 1 is viewed from one axial side, the angle θ is the angle between a line extending from the center of the arc (rotation axis RA) and passing through one end 211 of the seal segment 2, and a line extending from the center of the arc (rotation axis RA) and passing through the other end 212 in the circumferential direction of the seal segment 2. A curve L1 in FIG. 5 indicates the relationship between the angle θ of the seal segment 2 and the rotational moment.

[0042] As shown by curve L1 in Figure 5, as the angle θ of the seal segment 2 increases, the direction of action of the rotational moment reverses from the positive direction to the negative direction. Here, the angle θ of the seal segment 2 when the direction of action of the rotational moment reverses from the positive direction to the negative direction is defined as the reversal angle θ1. If the angle θ of the seal segment 2 is smaller than the predetermined reversal angle θ1 determined by the shape of the seal segment 2, the direction of action of the rotational moment will be in the positive direction, which may cause the seal members 3 and 6 of the seal segment 2 to tilt.

[0043] In the illustrated embodiment, the angles of the one-side seal segment 22 and the other-side seal segment 23 are smaller than the reversal angle θ1, and the angle of the movable seal segment 21 is larger than the reversal angle θ1.

[0044] 6 and 8 are schematic views of a seal device 1 according to an embodiment of the present disclosure, viewed from one side in the axial direction. FIG. 7 is a schematic cross-sectional view, taken along the circumferential direction, of the seal device 1 shown in FIG. 6. FIG. 9 is a schematic cross-sectional view, taken along the circumferential direction, of the seal device 1 shown in FIG. 8. FIG. 10 is a schematic cross-sectional view, taken along the circumferential direction, of the seal device 1 according to an embodiment of the present disclosure. FIG. 11 is a schematic cross-sectional view, taken along the circumferential direction, of the first gap and its vicinity of the rotary machine 10 according to an embodiment of the present disclosure, viewed from one side in the axial direction. In the seal device 1 according to some embodiments, as shown in FIGS. 6, 8, and 11, the retaining member 4 of the movable seal segment 21 is configured to be able to transmit a rotational moment toward the one-side seal segment 22 in the positive direction (the + direction in FIG. 4), i.e., a rotational moment such that the high-pressure side region PS1 side of the movable seal member 3 faces radially inward.

[0045] By configuring the retaining member 4 of the movable seal segment 21 so that it can transmit the rotational moment in the positive direction to the one-side seal segment 22, the total arc angle of the movable seal segment 21 and the one-side seal segment 22 can be made larger than the reversal angle θ1. By making the total arc angle larger, it is possible to prevent the movable seal segment 21 and the one-side seal segment 22 from tilting in the positive direction due to the rotational moment.

[0046] In some embodiments of the seal device 1, as shown in Figures 6 and 11, the retaining member 4 of the movable seal segment 21 is configured to be able to transmit a rotational moment to the other side seal segment 23 such that the high-pressure side region PS1 side of the movable seal member 3 moves radially inward.

[0047] By configuring the retaining member 4 of the movable seal segment 21 so that it can transmit the rotational moment in the positive direction to the other-side seal segment 23, the total arc angle of the movable seal segment 21, the one-side seal segment 22, and the other-side seal segment 23 can be made larger than the reversal angle θ1. By making the total arc angle larger, it is possible to prevent the movable seal segment 21, the one-side seal segment 22, and the other-side seal segment 23 from tilting in the positive direction due to the rotational moment in the positive direction.

[0048] (First embodiment) 6 and 7, the seal device 1 according to some embodiments includes at least one fastening member 24 (two in the illustrated example) that fastens the end portion 411 on one circumferential side of the base portion 41 of the retaining member 4 to the end portion 221 on the other circumferential side of the main body portion 61 of the one-side seal segment 22. In the illustrated embodiment, the seal device 1 further includes a plate-like member 25 that is arranged so as to overlap at least a portion of the end portion 221 on the other circumferential side of the one-side seal segment 22 and the end portion 411 on one side of the retaining member 4 in the circumferential direction. The plate-like member 25 has at least one insertion hole 251 through which the fastening member 24 can be inserted.

[0049] The plate-like member 25 may be arranged so that at least a portion thereof overlaps with one or the other axial end surface of the other end 221 of the one-side seal segment 22 and the one circumferential end 411 of the base 41 of the holding member 4, and may be configured to abut against those end surfaces. Furthermore, the plate-like member 25 may be arranged so that at least a portion thereof overlaps with the outer peripheral surface of the other end 221 and the one-side end 411, and may be configured to abut against those outer peripheral surfaces.

[0050] In the illustrated embodiment, each of the fastening members 24 described above is a fastening bolt including a head 241 and a shaft 242 having a diameter smaller than that of the head 241. The fastening member 24 includes a first fastening member 24A fastened to one end 411 and a second fastening member 24B fastened to the other end 221. Each of the first fastening member 24A and the second fastening member 24B has its head 241 engaged with the plate-like member 25 and its shaft 242 inserted through the insertion hole 251 to be fastened (in the illustrated example, screwed) to a fastening target. In this case, by connecting the one end 411 and the other end 221 via the fastening member 24 or the plate-like member 25, the retaining member 4 of the movable seal segment 21 can transmit the rotational moment in the positive direction to the one-side seal segment 22.

[0051] In some other embodiments, the head 241 of the fastening member 24 may be engaged with one of the circumferential end portions 411 on one side of the base 41 of the retaining member 4 or the other end portion 221 on the other side of the one-side seal segment 22, and the shaft portion 242 may be fastened to the other of the one-side end portion 411 or the other-side end portion 221, thereby connecting the one-side end portion 411 and the other-side end portion 221. In this case, the plate-like member 25 is not necessary.

[0052] 6, the seal device 1 according to some embodiments includes at least one fastening member 26 (two in the illustrated example) that fastens the other circumferential end 412 of the base 41 of the retaining member 4 to the one circumferential end 231 of the main body 61 of the other-side seal segment 23. In the illustrated embodiment, the seal device 1 further includes a plate-like member 27 that is arranged so as to overlap at least a portion of the one circumferential end 231 of the other-side seal segment 23 and the other circumferential end 412 of the retaining member 4. The plate-like member 27 has at least one insertion hole through which the fastening member 26 can be inserted.

[0053] The plate-like member 27 may be arranged so that at least a portion thereof overlaps with and abuts on the end surfaces on one or the other axial sides of the one end 231 and the other end 412. The plate-like member 27 may also be arranged so that at least a portion thereof overlaps with and abuts on the outer peripheral surfaces of the one end 231 and the other end 412.

[0054] In the illustrated embodiment, each of the fastening members 26 is a fastening bolt including a head and a shaft portion having a diameter smaller than that of the head. The fastening member 26 includes a third fastening member 26A fastened to the other end portion 412 and a fourth fastening member 26B fastened to the one end portion 231. The head of each of the third fastening member 26A and the fourth fastening member 26B is engaged with the plate-shaped member 27, and the shaft portion inserted through an insertion hole formed in the plate-shaped member 27 is fastened (e.g., screwed) to a fastening target. In this case, by connecting the other end portion 412 and the one end portion 231 via the fastening member 26 or the plate-shaped member 27, the retaining member 4 of the movable seal segment 21 can transmit the rotational moment in the positive direction to the other seal segment 23.

[0055] In some other embodiments, the other end 412 and the one end 231 may be connected by engaging the head of the fastening member 26 with one of the other end 412 or the one end 231, and fastening the shank of the fastening member 26 to the other of the other end 412 or the one end 231. In this case, the plate-like member 27 is not necessary.

[0056] (Second embodiment) In some embodiments of the sealing device 1, as shown in Figures 8 to 10, one of the circumferential end portions 411 on one side of the retaining member 4 or the circumferential end portions 221 on the other side of the one-side seal segment 22 includes an engaging recess 29, and the other of the circumferential end portions 411 on one side of the retaining member 4 or the circumferential end portions 221 on the other side of the one-side seal segment 22 includes an engaging protrusion 28 configured to engage with the engaging recess 29.

[0057] 8 and 9, the fitting protrusion 28 and the fitting recess 29 extend radially. The radially outer end of the fitting protrusion 28 is connected to a circumferentially extending portion 281 that extends from the other end 221 to overlap the one end 411 in the circumferential direction. The fitting recess 29 is a through hole that penetrates the holding member 4 radially, and the fitting protrusion 28 is inserted into the through hole. Note that a recess 291 that avoids interference with the circumferentially extending portion 281 may be provided in the one end 411.

[0058] 10, the fitting protrusion 28 and the fitting recess 29 extend along the circumferential direction. The fitting protrusion 28 protrudes from the end face of the other end 221 toward the other side in the circumferential direction. The fitting recess 29 is recessed toward the other side in the circumferential direction in the end face of the one end 411. Note that in some other embodiments, the fitting protrusion 28 and the fitting recess 29 may extend along the axial direction. Alternatively, the fitting recess 29 may be provided at the other end 221, and the fitting protrusion 28 may be provided at the one end 411.

[0059] By fitting the fitting protrusion 28 into the fitting recess 29, the end 411 on one side and the end 221 on the other side can be connected, and the retaining member 4 of the movable seal segment 21 can transmit the rotational moment in the positive direction to the one-side seal segment 22.

[0060] In the seal device 1 according to some embodiments, a fitting recess may be provided on one of the end portion 412 on the other circumferential side of the retaining member 4 or the end portion 231 on one circumferential side of the other-side seal segment 23, and a fitting protrusion configured to fit into the fitting recess may be provided on the other. In this case, the end portion 412 on the other side and the end portion 231 on one side can be connected, and the retaining member 4 of the movable seal segment 21 can transmit the rotational moment in the positive direction to the other-side seal segment 23.

[0061] (Third embodiment) 11, in the seal device 1 according to some embodiments, the above-described holding member 4 is configured integrally with at least a part of the one-side seal segment 22 (in the illustrated example, the fixed seal member 6). Note that, when the one-side seal segment 22 is a movable seal segment, the above-described holding member 4 may be configured integrally with a member corresponding to the holding member 4 of the one-side seal segment 22.

[0062] By integrally configuring the holding member 4 and the one-side seal segment 22, the holding member 4 of the movable seal segment 21 can transmit the rotational moment in the forward direction to the one-side seal segment 22.

[0063] 11, the above-described holding member 4 may be configured integrally with at least a part (in the illustrated example, the fixed seal member 6) of the other-side seal segment 23. Note that, if the other-side seal segment 23 is a movable seal segment, the above-described holding member 4 may be configured integrally with a member corresponding to the holding member 4 of the other-side seal segment 23.

[0064] By integrally configuring the holding member 4 and the other-side seal segment 23, the holding member 4 of the movable seal segment 21 can transmit the rotational moment in the forward direction to the other-side seal segment 23.

[0065] 6, the seal device 1 according to some embodiments further includes at least one second biasing device 7 that is provided at the other end 221 of the one-side seal segment 22 and is configured to bias the movable seal member 3 toward the other circumferential side. By biasing the movable seal member 3 with the second biasing device 7, the retaining member 4 of the movable seal segment 21 can also transmit the rotational moment in the positive direction to the one-side seal segment 22.

[0066] 6, the seal device 1 according to some embodiments further includes at least one third biasing device 7A that is provided at one end 231 of the other-side seal segment 23 and is configured to bias the movable seal member 3 to one side in the circumferential direction. By biasing the movable seal member 3 with the third biasing device 7A, the retaining member 4 of the movable seal segment 21 can also transmit the rotational moment in the positive direction to the other-side seal segment 23.

[0067] In the seal device 1 according to some embodiments, the one-side seal segment 22 described above is composed of a fixed seal segment including a seal member 6 that is not movable in the radial direction relative to the stationary member 12. In the seal device 1 according to some embodiments, the one-side seal segment 22 described above is composed of a movable seal segment including a seal member 3 that is movable in the radial direction relative to the stationary member 12. Whether the one-side seal segment 22 is composed of a fixed seal segment or a movable seal segment, the movable seal segment 21 and the one-side seal segment 22 can be prevented from tilting in the positive direction due to the rotational moment acting in the positive direction.

[0068] In the seal device 1 according to some embodiments, the other-side seal segment 23 described above is made of a fixed seal segment including a seal member 6 that is not movable in the radial direction relative to the stationary member 12. In the seal device 1 according to some embodiments, the other-side seal segment 23 described above is made of a movable seal segment including a seal member 3 that is movable in the radial direction relative to the stationary member 12. Whether the other-side seal segment 23 is made of a fixed seal segment or a movable seal segment, it is possible to prevent the movable seal segment 21 and the other-side seal segment 23 from tilting in the positive direction due to the rotational moment acting in the positive direction.

[0069] 1 , a rotary machine 10 according to some embodiments includes the above-described rotating member 11, the above-described stationary member 12, and the above-described seal device 1. The seal device 1 can prevent the movable seal segment 21 and the one-side seal segment 22 from tilting in the positive direction due to the rotational moment in the positive direction, thereby improving the reliability of the rotary machine 10.

[0070] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components.

[0071] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0072] The contents of the above-described embodiments can be understood, for example, as follows.

[0073] 1) The sealing device (1) according to at least one embodiment of the present disclosure comprises: A sealing device (1) for sealing a first gap (G1) formed between a rotating member (11) of a rotary machine (10) and a stationary member (12) arranged radially outward of the rotating member (11), comprising: a plurality of seal segments (2) arranged side by side in the circumferential direction of the rotating member (11) in the first gap (G1), the plurality of seal segments (2) dividing the first gap (G1) in the axial direction of the rotating member (11) into a high-pressure side region (PS1) through which a high-pressure fluid flows and a low-pressure side region (PS2) through which a low-pressure fluid flows; the plurality of seal segments (2) include a movable seal segment (21) and a one-side seal segment (22) adjacent to the movable seal segment (21) on one side in the circumferential direction, The movable seal segment (21) is a movable seal member (3) extending in the circumferential direction in the first gap (G1); a holding member (4) for supporting the movable seal member (3) disposed on the radially inner side so as to be movable along the radial direction; and at least one biasing device (5) configured to bias the movable seal member (3) radially outward relative to the holding member (4) along the radial direction, The retaining member (4) of the movable seal segment (21) is configured to be able to transmit a rotational moment to the one-side seal segment (22) such that the high-pressure side area side (PS1) of the movable seal member (3) moves inward in the radial direction.

[0074] According to the configuration 1), the retaining member 4 of the movable seal segment 21 is configured to be able to transmit the rotational moment in the forward direction to the one-side seal segment 22, thereby making the total arc angle of the movable seal segment 21 and the one-side seal segment 22 larger than the reversal angle θ1. By making the total arc angle larger, it is possible to prevent the movable seal segment 21 and the one-side seal segment 22 from tilting in the forward direction due to the rotational moment in the forward direction.

[0075] 2) In some embodiments, the sealing device (1) described in 1) above, At least one fastening member (24) is provided for fastening the one circumferential end (411) of the retaining member (4) to the other circumferential end (221) of the one-side seal segment (22).

[0076] According to the configuration 2), by connecting the one end (411) and the other end (221) via the fastening member (24) or the plate-like member 25, the retaining member (4) of the movable seal segment (21) can transmit the rotational moment in the positive direction to the one-side seal segment (22).

[0077] 3) In some embodiments, the sealing device (1) described in 1) above, one of the end portion (411) on the one side in the circumferential direction of the holding member (4) and the end portion (221) on the other side in the circumferential direction of the one-side seal segment (22) includes a fitting recess (29); The other of the circumferential end portion (411) on one side of the retaining member (4) or the circumferential end portion (221) on the other side of the one-side seal segment (22), the other of the circumferential end portion on one side of the retaining member or the other end portion on the other side of the one-side seal segment, includes an engaging protrusion (28) configured to engage with the engaging recess (29).

[0078] According to the configuration 3) above, by fitting the fitting protrusion (28) into the fitting recess (29), the end portion (411) on one side and the end portion (221) on the other side can be connected, and the retaining member (4) of the movable seal segment (21) can transmit the rotational moment in the positive direction to the one-side seal segment (22).

[0079] 4) In some embodiments, the sealing device (1) described in 1) above, The holding member (4) is integrally formed with at least a part of the one-side seal segment (22).

[0080] According to the configuration 4) above, by integrally configuring the retaining member (4) and the one-side seal segment (22), the retaining member (4) of the movable seal segment (21) can transmit the rotational moment in the positive direction to the one-side seal segment (22).

[0081] 5) The sealing device (1) according to at least one embodiment of the present disclosure includes: A sealing device (1) for sealing a first gap (G1) formed between a rotating member (11) of a rotary machine (10) and a stationary member (12) arranged radially outward of the rotating member (11), comprising: a plurality of seal segments (2) arranged side by side in the circumferential direction of the rotating member (11) in the first gap (G1), the plurality of seal segments (2) dividing the first gap (G1) in the axial direction of the rotating member (11) into a high-pressure side region (PS1) through which a high-pressure fluid flows and a low-pressure side region (PS2) through which a low-pressure fluid flows; the plurality of seal segments (2) include a movable seal segment (21) and a one-side seal segment (22) adjacent to the movable seal segment (21) on one side in the circumferential direction, The movable seal segment (21) is a movable seal member (3) extending in the circumferential direction in the first gap (G1); a holding member (4) for supporting the movable seal member (3) disposed on the radially inner side so as to be movable along the radial direction; and at least one biasing device (5) configured to bias the movable seal member (3) radially outward relative to the holding member (4) along the radial direction, The sealing device (1) The retaining member (4) further includes at least one fastening member (24) for fastening the one circumferential end (411) thereof to the other circumferential end (221) of the one-side seal segment (22).

[0082] According to the configuration of 5), by connecting the one end (411) and the other end (221) via the fastening member (24) or the plate-like member 25, the retaining member (4) of the movable seal segment (21) can transmit the rotational moment in the forward direction to the one-side seal segment (22). By configuring the retaining member (4) of the movable seal segment (21) to be able to transmit the rotational moment in the forward direction to the one-side seal segment (22), the total arc angle of the movable seal segment (21) and the one-side seal segment (22) can be made larger than the reversal angle (θ1). By making the total arc angle larger, it is possible to prevent the movable seal segment (21) and the one-side seal segment (22) from tilting in the forward direction due to the rotational moment in the forward direction.

[0083] 6) The sealing device (1) according to at least one embodiment of the present disclosure includes: A sealing device (1) for sealing a first gap (G1) formed between a rotating member (11) of a rotary machine (10) and a stationary member (12) arranged radially outward of the rotating member (11), comprising: a plurality of seal segments (2) arranged side by side in the circumferential direction of the rotating member (11) in the first gap (G1), the plurality of seal segments (2) dividing the first gap (G1) in the axial direction of the rotating member (11) into a high-pressure side region (PS1) through which a high-pressure fluid flows and a low-pressure side region (PS2) through which a low-pressure fluid flows; the plurality of seal segments (2) include a movable seal segment (21) and a one-side seal segment (22) adjacent to the movable seal segment (21) on one side in the circumferential direction, The movable seal segment (21) is a movable seal member (3) extending in the circumferential direction in the first gap (G1); a holding member (4) for supporting the movable seal member (3) disposed on the radially inner side so as to be movable along the radial direction; and at least one biasing device (5) configured to bias the movable seal member (3) radially outward relative to the holding member (4) along the radial direction, one of the end portion (411) on the one side in the circumferential direction of the holding member (4) and the end portion (221) on the other side in the circumferential direction of the one-side seal segment (22) includes a fitting recess (29); The other of the circumferential end portion (411) on one side of the retaining member (4) or the circumferential end portion (221) on the other side of the one-side seal segment (22), the other of the circumferential end portion on one side of the retaining member or the other end portion on the other side of the one-side seal segment, includes an engaging protrusion (28) configured to engage with the engaging recess (29).

[0084] According to the configuration 6), by fitting the fitting protrusion 28 into the fitting recess 29, the one end 411 and the other end 221 can be connected, and the retaining member 4 of the movable seal segment 21 can transmit the rotational moment in the forward direction to the one seal segment 22. By configuring the retaining member 4 of the movable seal segment 21 to be capable of transmitting the rotational moment in the forward direction to the one seal segment 22, the total arc angle of the movable seal segment 21 and the one seal segment 22 can be made larger than the reversal angle θ1. By making the total arc angle larger, it is possible to prevent the movable seal segment 21 and the one seal segment 22 from tilting in the forward direction due to the rotational moment in the forward direction.

[0085] 7) The sealing device (1) according to at least one embodiment of the present disclosure includes: A sealing device (1) for sealing a first gap (G1) formed between a rotating member (11) of a rotary machine (10) and a stationary member (12) arranged radially outward of the rotating member (11), comprising: a plurality of seal segments (2) arranged side by side in the circumferential direction of the rotating member (11) in the first gap (G1), the plurality of seal segments (2) dividing the first gap (G1) in the axial direction of the rotating member (11) into a high-pressure side region (PS1) through which a high-pressure fluid flows and a low-pressure side region (PS2) through which a low-pressure fluid flows; the plurality of seal segments (2) include a movable seal segment (21) and a one-side seal segment (22) adjacent to the movable seal segment (21) on one side in the circumferential direction, The movable seal segment (21) is a movable seal member (3) extending in the circumferential direction in the first gap (G1); a holding member (4) for supporting the movable seal member (3) disposed on the radially inner side so as to be movable along the radial direction; and at least one biasing device (5) configured to bias the movable seal member (3) radially outward relative to the holding member (4) along the radial direction, The holding member (4) is integrally formed with at least a part of the one-side seal segment (22).

[0086] According to the configuration of 7), by integrally configuring the retaining member 4 and the one-side seal segment 22, the retaining member 4 of the movable seal segment 21 can transmit the rotational moment in the forward direction to the one-side seal segment 22. By configuring the retaining member 4 of the movable seal segment 21 to be capable of transmitting the rotational moment in the forward direction to the one-side seal segment 22, the total arc angle of the movable seal segment 21 and the one-side seal segment 22 can be made larger than the reversal angle θ1. By making the total arc angle larger, it is possible to prevent the movable seal segment 21 and the one-side seal segment 22 from tilting in the forward direction due to the rotational moment in the forward direction.

[0087] 8) In some embodiments, the sealing device (1) described in 2) or 5) above, The plate-shaped member (25) is arranged so as to overlap at least a portion of the other end (221) of the one-side seal segment (22) and the one-side end (411) of the retaining member (4) in the circumferential direction, and has at least one insertion hole (251) through which the fastening member (24) can be inserted.

[0088] According to the configuration of 8) above, by connecting the one end (411) and the other end (221) via the fastening member (24) and the plate-like member (25), the retaining member (4) of the movable seal segment (21) can transmit the rotational moment in the positive direction to the one-side seal segment (22).

[0089] 9) In some embodiments, the sealing device (1) described in 3) or 6) above, The fitting protrusion (28) extends along the radial direction.

[0090] According to the configuration of 9) above, by extending the mating convex portion (28) and the mating concave portion (29) along the radial direction, the retaining member (4) and the one-side seal segment (22) can be prevented from separating circumferentially, and therefore the connection between the retaining member (4) and the one-side seal segment (22) is maintained.

[0091] 10) In some embodiments, the sealing device (1) according to any one of 1) to 9) above, The one-side seal segment (22) is a fixed seal segment including a seal member (6) that is immovable along the radial direction relative to the stationary member (12).

[0092] According to the configuration 10) above, when the one-side seal segment (22) is a fixed seal segment, the movable seal segment (21) and the one-side seal segment (22) can be prevented from tilting in the positive direction due to the rotational moment toward the positive direction.

[0093] 11) In some embodiments, the sealing device (1) according to any one of 1) to 9) above, The one-side seal segment (22) is a movable seal segment including a seal member (3) that is movable along the radial direction relative to the stationary member (12).

[0094] According to the configuration 11) above, when the one-side seal segment (22) is a movable seal segment, the movable seal segment (21) and the one-side seal segment (22) can be prevented from tilting in the positive direction due to the rotational moment toward the positive direction.

[0095] 12) In some embodiments, the sealing device (1) according to any one of the above items 10) to 11) is The valve further includes at least one second biasing device (7) provided at the other circumferential end (221) of the one-side seal segment (22) and configured to bias the movable seal member (3) toward the other circumferential side.

[0096] According to the configuration of 12) above, by biasing the movable seal member (3) by the second biasing device (7), the retaining member (4) of the movable seal segment (21) can transmit the rotational moment in the positive direction to the one-side seal segment (22).

[0097] 13) In some embodiments, the sealing device (1) according to any one of 1) to 12) above, the plurality of seal segments (2) further includes an other-side seal segment (23) adjacent to the movable seal segment (21) on the other side in the circumferential direction, The retaining member (4) of the movable seal segment (21) is configured to be able to transmit a rotational moment to the other side seal segment (23) such that the high pressure side region (PS1) side of the movable seal member (3) moves inward in the radial direction.

[0098] According to the configuration of 13), the retaining member 4 of the movable seal segment 21 is configured to be able to transmit the rotational moment in the forward direction to the other-side seal segment 23, thereby making it possible to make the total arc angle of the movable seal segment 21, the one-side seal segment 22, and the other-side seal segment 23 larger than the reversal angle θ1. By making the total arc angle larger, it is possible to prevent the movable seal segment 21, the one-side seal segment 22, and the other-side seal segment 23 from tilting in the forward direction due to the rotational moment in the forward direction.

[0099] 14) A rotary machine (10) according to at least one embodiment of the present disclosure includes: A sealing device (1) according to any one of 1) to 13) above; The rotating member (11), The stationary member (12).

[0100] According to the configuration 14), the movable seal segment (21) and the one-side seal segment (22) can be prevented from tilting in the positive direction due to the rotational moment acting in the positive direction, thereby improving the reliability of the rotary machine (10). [Explanation of symbols]

[0101] 1 Sealing device 2 seal segments 3 Movable seal member 4 Retaining member 5. Actuating device 6 Fixed seal member 10 Rotating Machinery 11 Rotating member 12 Stationary members 13 Groove 16 One side protrusion 21, 21A, 21B Movable seal segment 22, 22A, 22B One-side seal segment 23, 23A, 23B Other side seal segment 24,26 Fastening members 25,27 Plate-shaped members 28 Fitting protrusion 29. Fitting recess 31 Main body 32 Seal fin 41 Base 42 Inner flange 43 Interior Space 51 biasing member 52 Head 53 Shaft G1 First gap RA Rotation axis PS1 High pressure region PS2 Low pressure area

Claims

1. 1. A sealing device for sealing a first gap formed between a rotary member of a rotary machine and a stationary member arranged radially outward of the rotary member, comprising: a plurality of seal segments arranged side by side in the circumferential direction of the rotary member in the first gap, the plurality of seal segments dividing the first gap in the axial direction of the rotary member into a high-pressure side region through which a high-pressure fluid flows and a low-pressure side region through which a low-pressure fluid flows; the plurality of seal segments include a movable seal segment and a one-side seal segment adjacent to the movable seal segment on one side in the circumferential direction, The movable seal segment a movable seal member extending in the circumferential direction in the first gap; a holding member for supporting the movable seal member disposed on the radially inner side so as to be movable along the radial direction; at least one biasing device configured to bias the movable seal member radially outward relative to the retaining member along the radial direction, The holding member of the movable seal segment is configured to be able to transmit a rotational moment to the one-side seal segment such that the high-pressure side region side of the movable seal member moves inward in the radial direction. Sealing device.

2. at least one fastening member fastening an end portion of the retaining member on one side in the circumferential direction to an end portion of the one-side seal segment on the other side in the circumferential direction; The sealing device according to claim 1 .

3. one of the end portion on the one side in the circumferential direction of the retaining member and the end portion on the other side in the circumferential direction of the one-side seal segment includes a fitting recess, the other of the one end of the retaining member and the other end of the one seal segment includes a fitting protrusion configured to fit into the fitting recess; The sealing device according to claim 1 .

4. The retaining member is integrally formed with at least a portion of the one-side seal segment. The sealing device according to claim 1 .

5. 1. A sealing device for sealing a first gap formed between a rotary member of a rotary machine and a stationary member arranged radially outward of the rotary member, comprising: a plurality of seal segments arranged side by side in the circumferential direction of the rotary member in the first gap, the plurality of seal segments dividing the first gap in the axial direction of the rotary member into a high-pressure side region through which a high-pressure fluid flows and a low-pressure side region through which a low-pressure fluid flows; the plurality of seal segments include a movable seal segment and a one-side seal segment adjacent to the movable seal segment on one side in the circumferential direction, The movable seal segment a movable seal member extending in the circumferential direction in the first gap; a holding member for supporting the movable seal member disposed on the radially inner side so as to be movable along the radial direction; at least one biasing device configured to bias the movable seal member radially outward relative to the retaining member along the radial direction, The sealing device is and further including at least one fastening member that fastens an end portion of the retaining member on one side in the circumferential direction to an end portion of the one-side seal segment on the other side in the circumferential direction. Sealing device.

6. 1. A sealing device for sealing a first gap formed between a rotary member of a rotary machine and a stationary member arranged radially outward of the rotary member, comprising: a plurality of seal segments arranged side by side in the circumferential direction of the rotary member in the first gap, the plurality of seal segments dividing the first gap in the axial direction of the rotary member into a high-pressure side region through which a high-pressure fluid flows and a low-pressure side region through which a low-pressure fluid flows; the plurality of seal segments include a movable seal segment and a one-side seal segment adjacent to the movable seal segment on one side in the circumferential direction, The movable seal segment a movable seal member extending in the circumferential direction in the first gap; a holding member for supporting the movable seal member disposed on the radially inner side so as to be movable along the radial direction; at least one biasing device configured to bias the movable seal member radially outward relative to the retaining member along the radial direction, one of the end portion on the one side in the circumferential direction of the retaining member and the end portion on the other side in the circumferential direction of the one-side seal segment includes a fitting recess, the other of the one end of the retaining member and the other end of the one seal segment includes a fitting protrusion configured to fit into the fitting recess; Sealing device.

7. 1. A sealing device for sealing a first gap formed between a rotary member of a rotary machine and a stationary member arranged radially outward of the rotary member, comprising: a plurality of seal segments arranged side by side in the circumferential direction of the rotary member in the first gap, the plurality of seal segments dividing the first gap in the axial direction of the rotary member into a high-pressure side region through which a high-pressure fluid flows and a low-pressure side region through which a low-pressure fluid flows; the plurality of seal segments include a movable seal segment and a one-side seal segment adjacent to the movable seal segment on one side in the circumferential direction, The movable seal segment a movable seal member extending in the circumferential direction in the first gap; a holding member for supporting the movable seal member disposed on the radially inner side so as to be movable along the radial direction; at least one first biasing device configured to bias the movable seal member radially outward relative to the retaining member along the radial direction; The retaining member is integrally formed with at least a portion of the one-side seal segment. Sealing device.

8. a plate-like member disposed so as to overlap at least a portion of the other end of the one-side seal segment and the one end of the holding member in the circumferential direction, the plate-like member having at least one insertion hole through which the fastening member can be inserted; The sealing device according to claim 2 or 5.

9. The fitting protrusion extends along the radial direction. The sealing device according to claim 3 or 6.

10. the one-side seal segment is a fixed seal segment including a seal member that is immovable along the radial direction relative to the stationary member; The sealing device according to any one of claims 1 to 7.

11. the one-side seal segment is a movable seal segment including a seal member movable along the radial direction relative to the stationary member, The sealing device according to any one of claims 1 to 7.

12. and further comprising at least one second biasing device provided at an end of the one-side seal segment on the other side in the circumferential direction and configured to bias the movable seal member toward the other side in the circumferential direction. The sealing device of claim 10.

13. the plurality of seal segments further includes an other-side seal segment adjacent to the movable seal segment on the other side in the circumferential direction, The holding member of the movable seal segment is configured to be able to transmit a rotational moment to the other seal segment such that the high-pressure side region of the movable seal member moves inward in the radial direction. The sealing device according to any one of claims 1 to 7.

14. The sealing device according to any one of claims 1 to 7, The rotating member; The stationary member, Rotating machinery.

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