Seal device and rotating machine

Abstract

This sealing device comprises: a sealing member provided between a rotating part and a stationary part of a rotating machine in a radial direction of the rotating machine; a holding member for supporting the sealing member movably along the radial direction, the holding member being at least partly accommodated in a groove provided in the stationary part so as to extend along a circumferential direction; and a plurality of first biasing members provided at a plurality of different locations, respectively, in the circumferential direction, each first biasing member being accommodated in the holding member and configured to bias the sealing member along a vertical direction with respect to the holding member. The plurality of first biasing members are configured to generate biasing forces, respectively, which are parallel to each other.

Description

[Technical Field]

[0001] The present disclosure relates to a sealing device and a rotary machine. This application claims priority based on Japanese Patent Application No. 2022-023473, filed with the Japan Patent Office on February 18, 2022, the contents of which are incorporated herein by reference. [Background technology]

[0002] BACKGROUND ART A sealing device that has a structure in which a 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 a gap between a rotating part and a stationary part of a rotary machine such as a gas turbine or a steam turbine.

[0003] Patent Document 1 discloses a shaft seal device that is provided between a rotor (rotating part) and a stator (stationary part) and has a movable seal member that is movable along the radial direction. The movable seal member is partially housed in a groove in a housing (stationary part) fixed to the stator, and is biased radially outward by an elastic member.

[0004] In the shaft seal device of Patent Document 1, when the rotary machine is starting and stopping or is stopped, the movable seal member is biased radially outward by the elastic member, maintaining a large clearance between the rotor and the movable seal member. On the other hand, when the rotary machine is operating under load, 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). As a result, the movable seal member is displaced radially inward compared to when the rotary machine is starting and stopping, maintaining a small clearance between the rotor and the movable seal member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-141527 Summary of the Invention [Problem to be solved by the invention]

[0006] In the prior art such as Patent Document 1, the biasing member (e.g., the elastic member of Patent Document 1) for biasing the movable seal member in the radial direction is provided to generate a biasing force along the radial direction. When such biasing members are provided at multiple positions in the circumferential direction of the rotary machine, the multiple biasing members generate a radial biasing force at each circumferential position. In this case, since the biasing forces of the multiple biasing members are not aligned, the movement of the seal member may be hindered, for example, depending on the state of contact between the seal member and other stationary members, causing the parts to compete with each other. If the movement of the seal member is hindered, the operation of the sealing device may become unstable, which may lead to, for example, a decrease in the efficiency of the rotary machine.

[0007] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a sealing device and a rotary machine that are likely to operate stably. [Means for solving the problem]

[0008] A sealing device according to at least one embodiment of the present invention comprises: a seal member provided between a rotating portion and a stationary portion of the rotary machine in a radial direction of the rotary machine; a retaining member that is at least partially received in a groove provided in the stationary portion so as to extend along a circumferential direction and that supports the seal member so as to be movable along the radial direction; a plurality of first biasing members that are accommodated in the holding member and configured to bias the seal member in a vertical direction relative to the holding member, and that are provided at a plurality of different positions in the circumferential direction; Equipped with The plurality of first biasing members are configured to generate biasing forces in directions parallel to each other.

[0009] Moreover, the rotary machine according to at least one embodiment of the present invention includes: a rotating part and a stationary part; a sealing device as described above for reducing fluid leakage between the rotating part and the stationary part; Equipped with. [Effects of the Invention]

[0010] At least one embodiment of the present invention provides a sealing device and a rotary machine that are likely to operate stably. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a partial cross-sectional schematic view of a rotary machine according to an embodiment; [Figure 2] 2 is a diagram showing a portion of the rotary machine shown in FIG. 1 in more detail, and is a diagram showing a schematic view of a sealing device according to an embodiment. [Figure 3A] 3 is a schematic cross-sectional view of a sealing device according to one embodiment, taken along line AA in FIG. 2; [Figure 3B] 3 is a schematic cross-sectional view of a sealing device according to one embodiment, taken along line AA in FIG. 2; [Figure 4A] 3 is a schematic cross-sectional view of a sealing device according to one embodiment, taken along line BB in FIG. 2; [Figure 4B] 3 is a schematic cross-sectional view of a sealing device according to one embodiment, taken along line BB in FIG. 2; [Figure 5] 2, including the end portion in the circumferential direction of the movable seal member. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, several embodiments of the present invention 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 invention.

[0013] (Configuration of rotating machines) FIG. 1 is a partial schematic cross-sectional view perpendicular to the axial direction of a rotary machine according to one embodiment. FIG. 2 is a view showing a portion of the rotary machine shown in FIG. 1 in more detail, and is a view schematically showing a sealing device according to one embodiment. FIGS. 3A and 3B are schematic cross-sectional views of the sealing device according to one embodiment, taken along line AA in FIG. 2. FIGS. 4A and 4B are schematic cross-sectional views of the sealing device according to one embodiment, taken along line BB in FIG. 2. Here, FIGS. 3A and 4A are views showing the sealing device during start-up and shutdown operations of the rotary machine. FIGS. 3B and 4B are views showing the sealing device during load operation of the rotary machine.

[0014] A rotary machine according to some embodiments is a fluid machine such as a turbine (such as a gas turbine or a steam turbine), a compressor, or a pump. As shown in FIGS. 1 to 4B , a rotary machine 1 according to one embodiment includes a rotating section 2 (rotor) and a stationary section 4 (not shown in FIGS. 1 and 2) provided on the outer periphery of the rotating section 2. The rotating section 2 is supported by bearings (not shown) so as to be rotatable around a rotation axis O (see FIG. 1). The stationary section 4 includes a casing that houses the rotating section 2 and a stationary member supported by the casing. The stationary section 4 may include a blade ring for supporting stationary blades, or a stationary member (such as a dummy ring or a retaining ring) for supporting a seal member or the like.

[0015] A fluid passage (typically an annular passage) is formed between the rotating part 2 and the stationary part 4 in the radial direction of the rotary machine 1. As shown in FIGS. 3A to 4B , the rotary machine 1 includes a high-pressure part 6 including a passage through which a relatively high-pressure fluid flows among the above-mentioned fluid passages, and a low-pressure part 8 including a passage through which a fluid of lower pressure than the fluid in the high-pressure part 6 flows. The high-pressure part 6 and the low-pressure part 8 are positioned offset from each other in the axial direction (the direction of the rotation axis O).

[0016] The rotary machine 1 further includes a sealing device 10 to reduce fluid leakage through the gap between the rotating part 2 and the stationary part 4. The sealing device 10 according to some embodiments will be described in more detail below.

[0017] (Configuration of sealing device) 1 to 4B, the sealing device 10 includes a movable sealing member 20 (sealing member) provided between a rotating part 2 and a stationary part 4 in the radial direction of the rotary machine 1, and a holding member 30 for supporting the movable sealing member 20 so that the movable sealing member 20 is movable along the radial direction. In one embodiment, as shown in Fig. 1, the movable sealing member 20 and the holding member 30 extend along the circumferential direction. That is, the movable sealing member 20 and the holding member 30 may have an arc shape or a ring shape.

[0018] In some embodiments, as shown in FIGS. 1 and 2, the seal device 10 may include a fixed seal member 40 that is provided adjacent to the movable seal member 20 in the circumferential direction. The fixed seal member 40 is configured to basically not move in the radial direction. In the exemplary embodiment shown in FIG. 1, the seal device 10 includes a movable seal member 20 provided above and below the rotating unit 2 in the up-down direction (vertical direction), and a plurality of fixed seal members 40 provided on the sides of the rotating unit 2 adjacent to the ends of the movable seal member 20 in the circumferential direction. As shown in FIG. 2, a circumferential end face 29 of the movable seal member 20, a circumferential end face 39 of the holding member 30, and a circumferential end face 41 of the fixed seal member 40 may be arranged to face each other in the circumferential direction.

[0019] 3A to 4B, the movable seal member 20 is provided between the high pressure section 6 and the low pressure section 8 in the axial direction of the rotary machine 1. In the exemplary embodiment shown in FIGS. 3A to 4B, a plurality of seal fins 24 are provided on a surface 20a (inner peripheral surface) of the movable seal member 20 that faces the rotating section 2. In some embodiments, a plurality of seal fins may be provided on the outer peripheral surface of the rotating section 2 (i.e., the surface that faces the movable seal member 20).

[0020] The movable seal member 20 has an outer peripheral surface 20b facing the stationary portion 4, and a gap 21 that can communicate with the high-pressure portion 6 is formed between the outer peripheral surface 20b and the stationary portion 4 in the radial direction. In other words, the pressure of the fluid from the high-pressure portion 6 acts on the outer peripheral surface 20b of the movable seal member 20.

[0021] The retaining member 30 is at least partially accommodated in a groove 5 provided in the stationary portion 4 so as to extend along the circumferential direction. The groove 5 is provided so as to be recessed radially outward from the inner circumferential surface 4a of the stationary portion 4. The groove 5 may be provided in a casing (stationary portion 4) that accommodates the rotating portion 2 of the rotary machine 1, or in a stationary member (stationary portion 4) supported by the casing. The groove 5 may be provided, for example, in a dummy ring (stationary portion 4) of a steam turbine or a retaining ring (stationary portion 4) of a gas turbine. In the exemplary embodiment shown in FIGS. 3A to 4B , the retaining member 30 includes a base portion 32 accommodated in the groove 5 and a protrusion portion 34 that protrudes radially inward from the base portion 32.

[0022] The axial length of the portion of the holding member 30 that is housed in the groove 5 (the axial length of the base 32 in the illustrated embodiment) is slightly shorter than the axial length of the groove 5. Therefore, with axial play between the groove 5 and the holding member 30, the holding member 30 is positioned in the axial direction by the groove 5.

[0023] The retaining member 30 may have, in at least a portion of its circumferential region (for example, the portion shown in FIGS. 3A and 3B ), abutting portions 36 that abut against axial protruding portions 7 that protrude in the axial direction in the groove 5 of the stationary portion 4. Furthermore, in the groove 5, a biasing member 42 that biases the retaining member 30 radially inward may be provided on the radially outer side of the retaining member 30 and on the radially inner side of the stationary portion 4. The retaining member 30 may be biased radially inward by the biasing member 42, and the abutting portions 36 may abut against the axial protruding portions 7 to restrict the radial position of the retaining member 30, thereby positioning the retaining member 30 radially.

[0024] The above-mentioned stationary seal member 40 is provided radially between the rotating part 2 and the stationary part 4. The stationary seal member 40 may be at least partially housed in a groove provided in the stationary part 4 so as to extend along the circumferential direction.

[0025] In some embodiments, as shown in FIGS. 3A and 3B , the seal device 10 includes a head 52 accommodated in the retaining member 30 and a shaft 54 ​​extending radially and connecting the head 52 and the movable seal member 20. The movable seal member 20 is supported on the retaining member 30 so as to be movable radially via the head 52 and the shaft 54 ​​connected to the movable seal member 20. The head 52 is accommodated inside an accommodation space 31 provided in the retaining member 30. The shaft 54 ​​is provided to pass through a hole 33 provided in the retaining member 30 so as to communicate with the accommodation space 31. In the exemplary embodiment shown in FIGS. 3A and 3B , the seal device 10 includes a bolt portion 50, and the head 52 and the shaft 54 ​​are part of the bolt portion 50. In some embodiments, the head 52 and the shaft 54 ​​may be separate members. The head 52 and / or the shaft 54 ​​may include a pin.

[0026] Here, the axial length of the hole 33 is smaller than the diameter of the head 52 and larger than the diameter of the shank 54. Furthermore, the radial length of the accommodation space 31 is longer than the radial length of the head 52. Therefore, the head 52 and the shank 54 (bolt portion 50) can move radially inside the accommodation space 31 without the head 52 coming out of the accommodation space 31, and the movable seal member 20 connected to the shank 54 (bolt portion 50) can move radially together with the head 52 and the shank 54 (bolt portion 50). Note that, as shown in FIGS. 3A and 3B , the shank 54 may have one end on which a thread 56 is formed and may be configured to be threaded into the threaded hole 26 provided in the movable seal member 20. In some embodiments, the shank 54 (e.g., a pin) may be connected to the movable seal member 20 by shrink fitting, welding, or the like.

[0027] In some embodiments, the head portion 52 and the shaft portion 54 (bolt portion 50) may be provided at each of a plurality of positions in the circumferential direction.

[0028] The seal device 10 may include a first biasing member 60 configured to bias the movable seal member 20 radially outward relative to the retaining member 30 (see FIGS. 3A and 3B). As shown in FIGS. 3A and 3B, the first biasing member 60 may be provided between a surface 53 facing radially inward of the head 52 and a surface 37 facing radially outward of the inner wall surface forming the accommodation space 31 of the retaining member 30. The first biasing member 60 may include an elastic member capable of generating an elastic force along the radial direction. In the exemplary embodiment shown in FIGS. 3A and 3B, the first biasing member 60 includes a plurality of disc springs 62. The plurality of disc springs 62 may be provided such that the shaft portion 54 passes through a central hole in the plurality of disc springs 62.

[0029] In some embodiments, the above-described first biasing member 60 may be provided at each of a plurality of positions in the circumferential direction. Also, a plurality of head portions 52 and a plurality of shank portions 54 (e.g., a plurality of bolt portions 50) may be provided corresponding to the plurality of first biasing members 60, respectively.

[0030] 4A and 4B, the movable seal member 20 may be partially housed in the groove 5 of the stationary portion 4 at a position in the circumferential direction where the first biasing member 60 or the head portion 52 and the shaft portion 54 (bolt portion 50) are not provided. The movable seal member 20 may be located radially between the base portion 32 of the retaining member 30 and the axial protruding portion 7 of the stationary portion 4 and may include an engaging portion 28 that is engageable with the axial protruding portion 7. As shown in FIG. 3B, the engaging portion 28 is configured to engage with the axial protruding portion 7 when the movable seal member 20 is located radially inward.

[0031] Here, a brief description will be given of the operation of the above-described sealing device 10. During start-up and shutdown operations or when the rotary machine 1 is stopped, the movable seal member 20 is urged radially outward by the first urging member 60, maintaining a large clearance between the rotating part 2 and the movable seal member 20 (or the seal fins 24) (see FIGS. 3A and 4A). When the load on the rotary machine 1 increases, the pressure difference between the high-pressure section 6 and the low-pressure section 8 increases, resulting in a difference between the pressure acting on the outer circumferential surface 20b of the movable seal member 20 (the pressure of the high-pressure fluid in the high-pressure section 6) and the pressure acting on the inner circumferential surface 20a (the pressure decreasing from the high-pressure side to the low-pressure side). When the radially inward force acting on the movable seal member 20 due to this pressure difference overcomes the radially outward urging force of the first urging member 60, the movable seal member 20 moves to a radially inward position, and the clearance between the rotating part 2 and the movable seal member 20 (or the seal fins 24) becomes small (see FIGS. 3B and 4B). During load operation of the rotary machine 1 (such as during rated load operation), the pressure of the high-pressure fluid in the high-pressure section 6 continues to act on the outer surface 20b of the movable seal member 20, and the above-mentioned pressure difference is maintained, so that the clearance between the rotating section 2 and the movable seal member 20 (or seal fin 24) remains small (see Figures 3B and 4B).

[0032] 2, the seal device 10 includes a plurality of first biasing members 60 provided at a plurality of mutually different positions in the circumferential direction. Each of the plurality of first biasing members 60 is configured to bias the movable seal member 20 along the vertical direction relative to the holding member 30, and the plurality of first biasing members 60 are configured to generate biasing forces in directions parallel to each other. In other words, the plurality of first biasing members 60 are configured to generate biasing forces in directions parallel to each other along the vertical direction.

[0033] Herein, in this specification, if the angle between the directions of the biasing forces of any two of the multiple first biasing members 60 is 5 degrees or less, these biasing forces are considered to be parallel to each other.

[0034] 2, each of the plurality of first biasing members 60 is provided between a surface 53 facing radially inward of the head 52 and a surface 37 facing radially outward of the inner wall surface that forms the accommodation space 31 of the holding member 30 (see FIGS. 3A and 3B). The plurality of shaft portions 54 are provided so as to extend in directions parallel to one another along the vertical direction.

[0035] In the illustrated embodiment, a plurality of first biasing members 60 (four first biasing members 60 in FIG. 2) are provided near the top of the sealing device 10 in the vertical direction. In some embodiments, a plurality of first biasing members 60 may be provided near the bottom of the sealing device 10 in the vertical direction.

[0036] According to the above-described embodiment, the multiple first biasing members 60, which are provided at different positions in the circumferential direction, generate biasing forces parallel to each other along the vertical direction. Therefore, the biasing forces acting on the movable seal member 20 by the multiple first biasing members 60 are parallel to each other, so the movement of the movable seal member 20 is less likely to be hindered. This makes it easier to stabilize the operation of the seal device 10 including the movable seal member 20.

[0037] In some embodiments, the number density of the plurality of first biasing members 60 in a central region RI (see FIG. 2) of the movable seal member 20, which includes the position of the rotation axis O (see FIG. 1) of the rotating part 2 in the horizontal direction, is greater than the number density of the plurality of first biasing members 60 in end regions RE1, RE2 (see FIG. 2) which include the ends (positions of the end faces 29) in the circumferential direction of the movable seal member 20. Note that in the example shown in FIG. 2, the movable seal member 20 includes the central region RI, and an end region RE1 which includes the position of one of the end faces 29 of the movable seal member 20 in the circumferential direction, and an end region RE2 which includes the position of the other end face 29.

[0038] In this specification, the number density of the first biasing members 60 means the number of first biasing members 60 present within a range per unit length of the movable seal member 20 in the circumferential direction.

[0039] In the exemplary embodiment shown in FIG. 2, four first biasing members 60 are provided in the central region RI, Since the first biasing members 60 are not provided in the end regions RE1, RE2, the number density of the first biasing members 60 in the central region RI is greater than the number density of the first biasing members 60 in the end regions RE1, RE2.

[0040] According to the above-described embodiment, the first biasing members 60 are concentrated in the central region RI of the movable seal member 20, where it is easy to ensure the vertical and horizontal dimensions of the space for installing the biasing members. Therefore, it is easy to obtain a seal device 10 in which multiple biasing members that generate parallel biasing forces are arranged. This makes it possible to more effectively prevent the movement of the movable seal member 20 from being hindered due to the biasing forces of the multiple biasing members not being aligned in the same direction.

[0041] In some embodiments, the multiple first biasing members 60 are arranged in the circumferential direction over an angular range of 10 degrees or more, 15 degrees or more, or 20 degrees or more around the rotation axis O of the rotating part 2. That is, in some embodiments, the angle θ (see FIG. 2) between the lines connecting two first biasing members 60 arranged at both ends in the circumferential direction and the rotation axis O, among the multiple first biasing members 60, is 10 degrees or more, 15 degrees or more, or 20 degrees or more.

[0042] According to the above-described embodiment, the multiple first biasing members 60 are arranged over a wide angular range of 10 degrees or more, 15 degrees or more, or 20 degrees or more, so that even when a movable seal member 20 extending over a wide circumferential range is used, the multiple first biasing members 60 can apply a stable biasing force.

[0043] In some embodiments, the multiple first biasing members 60 are arranged in the circumferential direction over an angular range of 60 degrees or less or 45 degrees or less around the rotation axis O of the rotating part 2 (i.e., the above-mentioned angle θ is 60 degrees or less or 45 degrees or less), and in other opening angle ranges, no biasing members are arranged to bias the movable seal member 20 against the holding member 30. In this way, by providing the first biasing members 60 concentratedly in the central region of the movable seal member 20 and not providing biasing members in the end regions, it is easy to obtain a seal device 10 in which multiple biasing members that generate biasing forces parallel to each other are arranged.

[0044] 2, when viewed from the axial direction, one of the retaining member 30 or the movable seal member 20 includes a convex portion that protrudes in the vertical direction toward the other of the retaining member 30 or the movable seal member 20, and the other of the retaining member 30 or the movable seal member 20 includes a concave portion with which the convex portion can engage. When viewed from the axial direction, the side surfaces of the convex portion and the concave portion each extend along the vertical direction.

[0045] 2, the holding member 30 has a protrusion 70 that protrudes from the holding member 30 toward the movable seal member 20 in the vertical direction, and the movable seal member 20 has a recess 80 that can engage with the protrusion 70. A side surface 71 of the protrusion 70 and a side surface 81 of the recess 80 each extend along the vertical direction. The movable seal member 20 has a protrusion 82 that protrudes from the movable seal member 20 toward the holding member 30 in the vertical direction, and the holding member 30 has a recess 72 that can engage with the protrusion 82. A side surface 83 of the protrusion 82 and a side surface 73 of the recess 72 each extend along the vertical direction.

[0046] According to the above-described embodiment, the side surface 71 of the protrusion 70 and the side surface 81 of the recess 80 each extend along the vertical direction, or the side surface 83 of the protrusion 82 and the side surface 73 of the recess 72 each extend along the vertical direction. Therefore, when the movable seal member 20 moves along the vertical direction relative to the stationary portion 4 and the retaining member 30, the gap between the side surface 71 of the protrusion 70 and the side surface 81 of the recess 80, or the gap between the side surface 83 of the protrusion 82 and the side surface 73 of the recess 72, is easily maintained, and the movable seal member 20 and the retaining member 30 are less likely to compete with each other. Therefore, it is possible to more effectively prevent the movement of the movable seal member 20 from being hindered.

[0047] In some embodiments, as shown in FIG. 2, the seal device 10 includes a second biasing member 90 configured to apply a biasing force acting vertically on the circumferential end face 29 of the movable seal member 20.

[0048] 5 is a partial enlarged view of FIG. 2 including the circumferential end portion of the movable seal member 20. In the exemplary embodiment shown in FIG. 5, the second biasing member 90 is configured to generate a biasing force along the circumferential direction, and the biasing force is transmitted to the movable seal member 20 via a biasing force transmission portion 93.

[0049] In the embodiment shown in FIG. 5 , the biasing force transmission portion 93 includes a core rod 94 and a cap portion 96 provided at the tip end of the core rod 94. The biasing force transmission portion 93 and the second biasing member 90 are housed in a hole 44 opening in the circumferential end face 41 of the fixed seal member 40. The end face 41 of the fixed seal member 40, the end face 29 of the movable seal member 20, and the end face 39 of the holding member 30 each extend radially. The hole 44 extends linearly in the circumferential direction and has a bottom surface 46 at the end opposite the opening. The base end of the core rod 94 is fitted into a recess 48 recessed from the bottom surface 46 of the hole 44. The second biasing member 90 is provided between the bottom surface 46 of the hole 44 and an end face 97 of the cap portion 96 of the biasing force transmission portion 93. The second biasing member 90 may include an elastic member such as a spring.

[0050] The circumferential biasing force F (biasing force in the direction from the fixed seal member 40 toward the movable seal member 20) generated by the second biasing member 90 is transmitted to the movable seal member 20 via the biasing force transmission section 93. The biasing force F transmitted to the movable seal member 20 has a vertical component F1 and a horizontal component F2. Therefore, the biasing force of the second biasing member 90 acts in the vertical direction on the movable seal member 20. Note that the horizontal component F2 may be offset by the horizontal component of the biasing force by the second biasing member 90 on the other end side (left side in FIG. 2 ) of the movable seal member 20.

[0051] According to the above-described embodiment, in addition to the plurality of first biasing members 60, second biasing members 90 are provided to apply a biasing force acting in the vertical direction to the circumferential end face 29 of the movable seal member 20. Therefore, even if the vertical biasing force applied to the movable seal member 20 is insufficient when only the plurality of first biasing members 60 are provided, this can be supplemented by the biasing force of the second biasing member 90. This makes it easier to make the operation of the seal device 10 including the movable seal member 20 more stable.

[0052] 3A to 4B, for example, the movable seal member 20 has a sliding surface 22 that is adjacent to the protruding portion 34 of the holding member 30 in the axial direction and is slidable against the protruding portion 34. The protruding portion 34 has an opposing surface 35 that faces the sliding surface 22 of the movable seal member 20 in the axial direction. In other words, the sliding surface 22 of the movable seal member 20 and the opposing surface 35 of the protruding portion 34 are slidable against each other.

[0053] In the above-described embodiment, the protrusion 34 of the retaining member 30, which is housed in the groove 5 provided in the stationary portion 4, and the sliding surface 22 of the movable seal member 20 are adjacent to each other in the axial direction. Therefore, when the movable seal member 20 moves in the radial direction, the sliding surface 22 of the movable seal member 20 and the protrusion 34 of the retaining member 30 slide against each other. Therefore, if wear occurs on the sliding portion (the sliding surface 22 of the movable seal member 20 and the protrusion 34 of the retaining member 30), the surface of the sliding portion can be maintained in a desired state (e.g., a state having a desired coefficient of friction) by replacing the retaining member 30 and / or the movable seal member 20. Since it is easy to maintain the surface of the sliding portion in a desired state, it is easy to maintain a state in which the movable seal member 20 operates stably in the rotary machine 1. In other words, it is easy to maintain stable operation of the sealing device 10 in the rotary machine 1.

[0054] In a conventional sealing device that does not include a retaining member, a biasing member for biasing the movable seal member radially outward is provided between the movable seal member and the stationary member in the radial direction. Therefore, when the sealing device is installed in a rotary machine, the preload (radial force) applied to the biasing member can sometimes prevent the movable seal member from being inserted circumferentially into the groove.

[0055] In this regard, in the above-described embodiment, the movable seal member 20 is supported by the holding member 30, and the first biasing member 60 for biasing the movable seal member 20 radially outward is housed in the holding member 30. Therefore, with the movable seal member 20 and the first biasing member 60 assembled to the holding member 30, the holding member 30 can be inserted circumferentially into the groove 5 of the stationary portion 4, thereby installing the seal device 10 including the movable seal member 20 in the rotary machine 1. Therefore, even when a relatively large preload is applied to the first biasing member 60, the preload does not hinder the insertion of the seal device 10 into the groove, and the seal device 10 can be smoothly installed in the rotary machine 1.

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

[0057] (1) At least one embodiment of the sealing device (10) of the present invention comprises: a seal member (for example, the above-mentioned movable seal member 20) provided between the rotating part (2) and the stationary part (4) of the rotary machine (1) in the radial direction of the rotary machine; a retaining member (30) that is at least partially received in a groove (5) provided in the stationary portion so as to extend along the circumferential direction and that supports the seal member so as to be movable along the radial direction; a plurality of first biasing members (60) that are accommodated in the holding member and configured to bias the seal member in a vertical direction relative to the holding member, and that are provided at a plurality of mutually different positions in the circumferential direction; Equipped with The plurality of first biasing members are configured to generate biasing forces in directions parallel to each other.

[0058] According to the above configuration (1), the multiple first biasing members provided at different positions in the circumferential direction generate biasing forces parallel to each other along the vertical direction. Therefore, the biasing forces acting on the seal member by the multiple first biasing members are parallel to each other, so the movement of the seal member is less likely to be hindered. This makes it easier to stabilize the operation of the seal device including the movable seal member.

[0059] (2) In some embodiments, in the configuration of (1), the seal member extends along the circumferential direction, The number density of the plurality of first biasing members in a central region (RI) of the sealing member, which includes the position of the rotation axis (O) of the rotating part in the horizontal direction, is greater than the number density of the plurality of first biasing members in end regions (RE1, RE2) which include the ends of the sealing member in the circumferential direction.

[0060] According to the above configuration (2), the first biasing members are concentrated in the central region of the seal member, where it is easy to ensure the vertical and horizontal dimensions of the space in which the biasing members are installed. Therefore, it is easy to obtain a seal device in which multiple biasing members that generate parallel biasing forces are arranged. As a result, it is possible to more effectively prevent the movement of the seal member from being hindered due to the biasing forces of the multiple biasing members not being aligned in the same direction.

[0061] (3) In some embodiments, in the configuration of (1) or (2), The sealing device is a plurality of shaft portions (54) provided corresponding to the plurality of first biasing members and attached to the seal member; heads (52) provided corresponding to the plurality of shaft portions and accommodated in the holding member, Each of the plurality of first biasing members is provided between a surface (53) of the head facing radially inward and a surface (37) of the inner wall surface of the holding member facing radially outward.

[0062] According to the above configuration (3), the seal member is supported by the holding member via the multiple heads and multiple shafts so as to be movable in the radial direction, and a vertical biasing force is applied to the seal member via the multiple heads and multiple shafts by the multiple first biasing members provided between the multiple heads and the inner wall surface of the holding member, respectively. In this way, with a simple configuration using the multiple heads and multiple shafts, the seal member can be supported so as to be movable in the radial direction, and the biasing force of the biasing member can be applied to the seal member.

[0063] (4) In some embodiments, in any of the configurations (1) to (3) above, The sealing device is A second biasing member (90) is provided which is configured to apply a biasing force acting in the vertical direction to the end face in the circumferential direction of the seal member.

[0064] According to the above configuration (4), in addition to the first biasing member, a second biasing member is provided to apply a biasing force acting vertically on the circumferential end face of the seal member. Therefore, even if the vertical biasing force applied to the seal member is insufficient when multiple first biasing members are provided, the biasing force of the second biasing member can compensate. This makes it easier to stabilize the operation of the seal device including the movable seal member.

[0065] (5) In some embodiments, in any of the configurations (1) to (4) above, one of the holding member and the sealing member includes a protrusion (70 or 82) that protrudes toward the other of the holding member and the sealing member along the vertical direction, the other of the holding member and the sealing member includes a recess (80 or 72) with which the protrusion can engage, When viewed in the axial direction, the side surface (71 or 83) of the convex portion and the side surface (81 or 73) of the concave portion each extend along the vertical direction.

[0066] According to the configuration (5) above, since the side surfaces of the convex portion and the concave portion each extend vertically, when the seal member moves vertically relative to the stationary portion and the retaining member, a gap is easily maintained between the side surfaces of the convex portion and the concave portion, and the seal member and the retaining member are less likely to compete with each other. Therefore, it is possible to more effectively prevent the movement of the seal member from being hindered.

[0067] (6) In some embodiments, in any of the configurations (1) to (5) above, The plurality of first biasing members are arranged in the circumferential direction over an angular range of 10 degrees or more around the rotation axis of the rotating portion.

[0068] According to the configuration (6) above, the multiple first biasing members are arranged over a wide angular range of 10 degrees or more, so that even when a sealing member that extends over a wide circumferential range is used, the multiple first biasing members can apply a stable biasing force.

[0069] (7) A rotary machine (1) according to at least one embodiment of the present invention includes: A rotating part (2) and a stationary part (4), a seal device (10) according to any one of (1) to (6) above for reducing fluid leakage between the rotating part and the stationary part; Equipped with.

[0070] According to the above configuration (7), the multiple first biasing members provided at different positions in the circumferential direction generate biasing forces parallel to each other along the vertical direction. Therefore, the biasing forces acting on the seal member by the multiple first biasing members are parallel to each other, so the movement of the seal member is less likely to be hindered. This makes it easier to stabilize the operation of the seal device including the movable seal member.

[0071] The above describes an embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and also includes forms in which the above-described embodiment is modified, or forms in which these forms are appropriately combined.

[0072] 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. [Explanation of symbols]

[0073] 1 Rotating Machinery 2 Rotating part 4 Stationary part 4a Inner surface 5 grooves 6 High-voltage section 7 Axial protrusion 8 Low-pressure section 10 Sealing device 20 Movable seal member 20a Inner surface 20b Outer surface 21 Gap 22 sliding surface 24 Seal fin 26 screw holes 28 Engagement part 29 End face 30 Retaining member 31 Containment Space 32 Base 33 holes 34 Protrusion 35 Opposite Surface 36 Contact part 37 sides 39 End face 40 Fixed seal member 41 End face 42 biasing member 44 holes 46 bottom 48 recess 50 Bolt section 52 Head 53 sides 54 Shaft 56 Screw 60 First biasing member 62 Disc spring 70 Convex part 71 Side 72 recess 73 Side 80 recess 81 Side 82 Convex part 83 Side 90 second biasing member 92 Disc spring 93 Force transmission part 94 Core rod 96 Cap part 97 End face F biasing force O Rotation axis RE1 end area RE2 end area RI central region

Claims

1. a seal member provided between a rotating portion and a stationary portion of the rotary machine in a radial direction of the rotary machine; a retaining member that is at least partially received in a groove provided in the stationary portion so as to extend along a circumferential direction and that supports the seal member so as to be movable along the radial direction; a plurality of first biasing members that are accommodated in the holding member and configured to bias the seal member in a vertical direction relative to the holding member, the first biasing members being provided at a plurality of different positions in a circumferential direction; Equipped with the plurality of first biasing members are configured to generate biasing forces in directions parallel to each other, one of the holding member and the sealing member includes a convex portion that protrudes along the vertical direction toward the other of the holding member and the sealing member, the other of the holding member and the sealing member includes a recess with which the protrusion can be engaged, When viewed from the axial direction, the side surfaces of the protrusions and the side surfaces of the recesses each extend along the vertical direction. Sealing device.

2. the seal member extends along the circumferential direction, The number density of the plurality of first biasing members in a central region of the seal member including the position of the rotation axis of the rotating part in the horizontal direction is greater than the number density of the plurality of first biasing members in end regions including the ends in the circumferential direction of the seal member. The sealing device according to claim 1 .

3. a plurality of shaft portions provided corresponding to the plurality of first biasing members and attached to the seal member; a plurality of heads provided corresponding to the plurality of shaft portions and accommodated in the holding member, Each of the plurality of first biasing members is provided between a surface of the head facing radially inward and a surface of the inner wall surface of the holding member facing radially outward. The sealing device according to claim 1 or 2.

4. a second biasing member configured to apply a biasing force acting in the vertical direction to an end surface of the seal member in the circumferential direction; The sealing device according to claim 1 or 2.

5. The plurality of first biasing members are arranged in the circumferential direction over an angular range of 10 degrees or more around the rotation axis of the rotating portion. The sealing device according to claim 1 or 2.

6. The plurality of first biasing members are arranged only within an angular range of 45 degrees or less around the rotation axis of the rotating portion in the circumferential direction. The sealing device according to claim 1 or 2.

7. A seal member provided between a rotating part and a stationary part of the rotary machine in the radial direction of the rotary machine; a retaining member that is at least partially received in a groove provided in the stationary portion so as to extend along a circumferential direction and that supports the seal member so as to be movable along the radial direction; a plurality of first biasing members that are accommodated in the holding member and configured to bias the seal member in a vertical direction relative to the holding member, the first biasing members being provided at a plurality of different positions in a circumferential direction; Equipped with the plurality of first biasing members are configured to generate biasing forces in directions parallel to each other, The holding member is a base portion received in the groove; a protrusion protruding radially inward from the base, The seal member has a sliding surface that is adjacent to the protruding portion in the axial direction and is slidable against the protruding portion. Sealing device.

8. a rotating part and a stationary part; a sealing device according to claim 1 or 2 for reducing fluid leakage between the rotating part and the stationary part; A rotating machine comprising:

Images