Seal device, rotating machine, and method for installing seal device

Abstract

This sealing device comprises: a sealing member provided between a rotary part and a stationary part of a rotary machine in the radial direction of the rotary machine; and a holding member which is at least partially accommodated in a groove provided in the stationary part so as to extend in the circumferential direction and which is for supporting the sealing member to be movable in the radial direction, wherein the holding member has a base part accommodated in the groove and a protruding part protruding radially inwards from the base part, and the sealing member has a sliding surface which is axially adjacent to the protruding part and is slidable on the protruding part.

Description

[Technical field]

[0001] The present disclosure relates to a seal arrangement and a rotary machine, as well as a method of installing the seal arrangement. This application claims priority based on Patent Application No. 2022-023470, filed with the Japan Patent Office on February 18, 2022, the contents of which are incorporated herein by reference. [Background technology]

[0002] 2. Description of the Related Art 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 may have a structure in which a sealing member is movable in a radial direction depending on the operating state of the rotary machine.

[0003] Patent Document 1 discloses an axial seal device provided between a rotor (rotating part) and a stator (stationary part) and equipped with a movable seal member 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 in start-stop operation or stopped, the movable seal member is biased radially outward by the elastic member, and the clearance between the rotor and the movable seal member is kept large. On the other hand, when the rotary machine is in a loaded operation, the pressure of the high-pressure working fluid acts on the outer circumferential surface of the movable seal member, and a radially inward force (i.e., a force resisting the biasing force of the elastic member) is applied to the movable seal member. As a result, the movable seal member is displaced radially inward compared to when the rotary machine is in a start-stop operation or the like, and the clearance between the rotor and the movable seal member is kept small. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-141527 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the seal device described in Patent Document 1, the movable seal member is partially accommodated in a groove in a stationary part of a rotary machine, and when the seal member moves in a radial direction, the seal member slides against the stationary part. When this sliding is repeated, wear or the like occurs on the sliding surfaces of the seal member and the stationary part, and the state of the sliding surfaces (friction coefficient, etc.) changes from the intended state. When the sliding surfaces change from the intended state in this way, the operation of the movable seal member deviates from expectations, such as the movable seal member not moving at the intended timing, and the operation of the seal device may become unstable. As a result, this may lead to a decrease in the efficiency of the rotary machine and an increased risk of the seal member coming into contact with the rotating part.

[0007] In view of the above circumstances, at least one embodiment of the present invention aims to provide a seal device and a rotating machine that make it easy to maintain stable operation of a seal device including a movable seal member, as well as a method for installing the seal device. [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 part and a stationary part 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 movably along the radial direction; Equipped with The holding member is A base portion received in the groove; a protruding portion protruding radially inward from the base portion, The seal member has a sliding surface adjacent to the protruding portion in the axial direction and capable of sliding against the protruding portion.

[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.

[0010] Further, a method for installing a seal device according to at least one embodiment of the present invention includes the steps of: A method for mounting the above-described seal device to a rotary machine having a rotating part and a stationary part, comprising the steps of: a step of inserting the holding member into the groove provided in the stationary portion along a circumferential direction while the seal member is attached to the holding member; Equipped with. Effect of the Invention

[0011] According to at least one embodiment of the present invention, a seal device and a rotary machine that facilitate maintaining stable operation of a seal device including a movable seal member, as well as a method for installing the seal device, are provided. [Brief description of the drawings]

[0012] [Figure 1] 1 is a partial cross-sectional schematic view of a rotary machine according to an embodiment; [Figure 2A] FIG. 2 is a schematic cross-sectional view of a sealing device according to one embodiment, taken along line AA in FIG. 1; [Figure 2B] FIG. 2 is a schematic cross-sectional view of a sealing device according to one embodiment, taken along line AA in FIG. 1; [Figure 3A] FIG. 2 is a schematic cross-sectional view of a sealing device according to an embodiment, taken along line BB in FIG. 1. [Figure 3B] FIG. 2 is a schematic cross-sectional view of a sealing device according to an embodiment, taken along line BB in FIG. 1. [Figure 4] FIG. 2 is a schematic enlarged view of a sliding portion of a seal device according to one embodiment. [Diagram 5] FIG. 2 is a schematic enlarged view of a sliding portion of a seal device according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, some 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 the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0014] (Configuration of Rotating Machines) Fig. 1 is a schematic partial cross-sectional view perpendicular to the axial direction of a rotary machine according to an embodiment. Figs. 2A and 2B are schematic cross-sectional views of a seal device according to an embodiment, taken along line AA in Fig. 1. Figs. 3A and 3B are schematic cross-sectional views of a seal device according to an embodiment, taken along line BB in Fig. 1. Here, Figs. 2A and 3A are views showing the seal device during start-up and shut-down operations of the rotary machine. Figs. 2B and 3B are views showing the seal device during load operation of the rotary machine.

[0015] 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 3B, a rotary machine 1 according to one embodiment includes a rotating part 2 (rotor) and a stationary part 4 (not shown in FIG. 1) provided on the outer periphery of the rotating part 2. The rotating part 2 is supported by a bearing (not shown) so as to be rotatable around a central axis O. The stationary part 4 includes a casing that houses the rotating part 2, and a stationary member supported by the casing. The stationary part 4 may include a blade ring for supporting a stationary blade, or a stationary member (such as a dummy ring or a retaining ring) for supporting a seal member or the like.

[0016] A fluid passage (typically annular passage) is formed between the rotating part 2 and the stationary part 4 in the radial direction of the rotating machine 1. As shown in Figures 2A to 3B, the rotating machine 1 includes a high pressure section 6 including a passage through which a relatively high pressure fluid flows among the above-mentioned fluid passages, and a low pressure section 8 including a passage through which a fluid of a lower pressure than the fluid in the high pressure section 6 flows. The high pressure section 6 and the low pressure section 8 are positioned so as to be shifted from each other in the axial direction (the direction of the central axis O).

[0017] The rotary machine 1 further comprises a sealing device 10 for reducing 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.

[0018] (Configuration of sealing device) 1 to 3B, the sealing device 10 includes a movable seal member 20 (seal 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 seal member 20 movably along the radial direction. In one embodiment, as shown in Fig. 1, the movable seal member 20 and the holding member 30 extend along the circumferential direction. That is, the movable seal member 20 and the holding member 30 may have an arc shape or a ring shape.

[0019] In some embodiments, the seal device 10 may include a fixed seal member 40 provided adjacent to the movable seal member 20 in the circumferential direction, as shown in Fig. 1 for example. The fixed seal member 40 is configured not to move basically along the radial direction. In the exemplary embodiment shown in Fig. 1, the seal device 10 includes the movable seal members 20 provided above and below the rotating part 2 in the up-down direction (vertical direction), and a plurality of fixed seal members 40 provided on the sides of the rotating part 2 adjacent to the ends of the movable seal members 20 in the circumferential direction.

[0020] 2A to 3B, 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. 2A to 3B, a plurality of seal fins 24 are provided on a surface 20a (inner circumferential 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 circumferential surface of the rotating section 2 (i.e., the surface that faces the movable seal member 20).

[0021] The movable seal member 20 has an outer circumferential 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 circumferential 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 circumferential surface 20b of the movable seal member 20.

[0022] 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 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. 2A to 3B, the retaining member 30 includes a base portion 32 accommodated in the groove 5 and a protruding portion 34 that protrudes radially inward from the base portion 32.

[0023] The axial length of the portion of the retaining member 30 that is accommodated 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 some axial play between the groove 5 and the retaining member 30, the retaining member 30 is positioned in the axial direction by the groove 5.

[0024] The retaining member 30 may have, in at least a portion of a circumferential region (e.g., the portion shown in FIGS. 2A and 2B ), an abutting portion 36 that abuts against an axial protruding portion 7 that protrudes in the axial direction in the groove 5 of the stationary portion 4. Furthermore, in the groove 5, a biasing member 42 for biasing 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 portion 36 may abut against the axial protruding portion 7 to regulate the radial position of the retaining member, thereby positioning the retaining member 30 in the radial direction.

[0025] In some embodiments, as shown in, for example, FIGS. 2A and 2B, the seal device 10 includes a head 52 accommodated in the holding member 30 and a shaft portion 54 extending along a radial direction and connecting the head 52 and the movable seal member 20. The movable seal member 20 is supported by the holding member 30 so as to be movable along a radial direction via the shaft portion 54 and the head 52 connected to the movable seal member 20. The head 52 is accommodated inside an accommodation space 31 provided in the holding member 30. The shaft portion 54 is provided to pass through a hole 33 provided in the holding member 30 so as to communicate with the accommodation space 31. In the exemplary embodiment shown in FIGS. 2A and 2B, the seal device 10 includes a bolt portion 50, and the head 52 and the shaft portion 52 described above are part of the bolt portion 50. In some embodiments, the head 52 and the shaft portion 54 may be composed of separate members. The head 52 and / or the shaft portion 54 may include a pin.

[0026] Here, the length of the hole 33 in the axial direction is smaller than the diameter of the head 52 and larger than the diameter of the shaft portion 54. The length of the accommodation space 31 in the radial direction is longer than the length of the head 52 in the radial direction. Therefore, the head 52 and the shaft portion 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 shaft portion 54 (bolt portion 50) can move radially together with the head 52 and the shaft portion 54 (bolt portion 50). As shown in FIGS. 2A and 2B, the shaft portion 54 may have one end portion on which a thread 56 is formed, and may be screwed into the screw hole 26 provided in the movable seal member 20. In some embodiments, the shaft portion 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) described above may be provided at each of a plurality of positions in the circumferential direction.

[0028] In some embodiments, the seal device 10 may include a biasing member 60 configured to bias the movable seal member 20 radially outward relative to the retaining member 30 (see FIGS. 2A and 2B). As shown in FIGS. 2A and 2B, the 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 an inner wall surface forming the accommodation space 31 of the retaining member 30. In the exemplary embodiment shown in FIGS. 2A and 2B, the biasing member 60 includes a plurality of disc springs 62.

[0029] In some embodiments, the above-mentioned biasing member 60 may be provided at each of a plurality of positions in the circumferential direction.

[0030] In addition, at a position in the circumferential direction where the 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 partially housed in the groove 5 of the stationary portion 4, as shown in Figures 3A and 3B, for example. The movable seal member 20 may be located between the base portion 32 of the holding member 30 and the axial protruding portion 7 of the stationary portion 4 in the radial direction and may include an engaging portion 28 that is engageable with the axial protruding portion 7. As shown in Figure 3B, the engaging portion 28 is adapted to engage with the axial protruding portion 7 when the movable seal member 20 is located radially inward.

[0031] Here, the operation of the above-mentioned seal device 10 will be briefly described. During start-stop operation or stop of the rotary machine 1, the movable seal member 20 is biased radially outward by the biasing member 60, and the clearance between the rotating part 2 and the movable seal member 20 (or the seal fin 24) is kept large (see Figs. 2A and 3A). When the load of the rotary machine 1 increases, the pressure difference between the high pressure part 6 and the low pressure part 8 increases, and this causes a difference between the pressure acting on the outer peripheral surface 20b of the movable seal member 20 (the pressure of the high pressure fluid in the high pressure part 6) and the pressure acting on the inner peripheral surface 20a (the pressure decreasing from the high pressure side to the low pressure side). When the radially inward force applied to the movable seal member 20 due to this pressure difference overcomes the radially outward biasing force by the biasing 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 fin 24) becomes small (see Figs. 2B and 3B). When the rotating machine 1 is operating under load (e.g., operating at rated load), the pressure of the high-pressure fluid in the high-pressure section 6 continues to act on the outer surface 20b of the movable sealing member 20, and the above-mentioned pressure difference is maintained, so that the clearance between the rotating section 2 and the movable sealing member 20 (or the sealing fin 24) is kept small (see Figures 2B and 3B).

[0032] 2A to 3B, 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 capable of sliding 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 capable of sliding against each other.

[0033] 2A to 3B, the protrusion 34 of the holding member 30 is located closer to the low pressure section 8 in the axial direction than the sliding surface 22 of the movable seal member 20 (i.e., the sliding surface 22 of the movable seal member 20 is located closer to the high pressure section 6 than the protrusion 34). Therefore, when the rotating machine 1 is in operation, a force is applied to the movable seal member 20 in the axial direction from the high pressure section 6 side to the low pressure section 8 side due to the pressure difference between the high pressure section 6 and the low pressure section 8, so that the movable seal member 20 and the holding member 30 slide against each other with the movable seal member 20 pressed against the protrusion 34 of the holding member 30.

[0034] In a conventional seal device, that is, a seal device in which a movable seal member is accommodated in a groove of a stationary part (e.g., a stationary member such as a dummy ring or a retaining ring) of a rotary machine (i.e., a seal device that does not include a retaining member), when the movable seal member moves along the radial direction, the seal member slides against the stationary part (a stationary member having a groove that accommodates the seal member). When this sliding is repeated, wear and the like occurs on the sliding surfaces of the seal member and the stationary part, and the state of the sliding surfaces (friction coefficient, etc.) changes from the intended state. When the sliding surfaces change from the intended state in this way, the operation of the movable seal member deviates from the expected state, such as the movable seal member not moving at the intended timing, and the operation of the seal device may become unstable. As a result, this may lead to a decrease in the efficiency of the rotary machine and an increase in the risk of contact between the seal member and the rotating part. It is possible to maintain the state of the sliding surface in the intended state by replacing the worn parts, but the parts that cause wear (e.g., a dummy ring or a retaining ring) are large parts that constitute the stationary part of the rotary machine, and such large parts may not be easily replaced due to cost and other factors.

[0035] In this regard, in the above-mentioned embodiment, the protrusion 34 of the holding member 30 housed in the groove 5 provided in the stationary part 4 and the sliding surface 22 of the movable seal member 20 supported by the holding member 30 so as to be movable in the radial direction are adjacent to each other in the axial direction. Therefore, when the movable seal member 20 moves along the radial direction, the sliding surface 22 of the movable seal member 20 and the protrusion 34 of the holding member 30 slide against each other. Therefore, when wear occurs in the sliding part (the sliding surface 22 of the movable seal member 20 and the protrusion 34 of the holding member 30), the holding member 30 and / or the movable seal member 20 can be replaced to maintain the surface of the sliding part in a desired state (for example, a state having a desired friction coefficient). Since it is easy to maintain the surface of the sliding part in a desired state, it is easy to maintain a state in which the movable seal member 20 operates stably in the rotating machine 1. In other words, it is easy to maintain stable operation of the seal device 10 in the rotating machine 1.

[0036] In the above-described embodiment, the movable seal member 20 is biased by the biasing member 60 radially outward relative to the retaining member 30 housed in the groove 5 of the stationary part 4. In this manner, the biasing member 60 applies a radially outward force to the movable seal member 20, so that the movable seal member 20 can move smoothly along the radial direction in accordance with the operating state of the rotating machine 1.

[0037] In the above embodiment, the movable seal member 20 is supported by the retaining member 30 via the head 52 and the shaft portion 54 (bolt portion) 50 so as to be movable in the radial direction, and a radially outward force is applied to the movable seal member 20 via the head 52 and the shaft portion 54 (bolt portion 50) by the biasing member 60 provided between the head 52 and the inner wall surface (surface 37) of the retaining member 30. In this manner, with a simple configuration using the head 52 and the shaft portion 54 (bolt portion 50), a radially outward biasing force can be applied to the movable seal member 20 while supporting the movable seal member 20 so as to be movable along the radial direction.

[0038] In addition, in a conventional seal device (i.e., a seal device that does not include a holding 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 seal device is installed in a rotary machine, the movable seal member may not be inserted into the groove in the circumferential direction due to a preload (a radial force) applied to the biasing member.

[0039] In this regard, in the above-described embodiment, the movable seal member 20 is supported by the holding member 30, and the biasing member 60 for biasing the movable seal member 20 radially outward is housed in the holding member 30. Therefore, in a state in which the movable seal member 20 and the biasing member 60 are assembled to the holding member 30, the holding member 30 is inserted circumferentially into the groove 5 of the stationary part 4, whereby the seal device 10 including the movable seal member 20 can be installed in the rotating machine 1. Therefore, even in a state in which a relatively large preload is applied to the 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 rotating machine 1.

[0040] 4 and 5 are schematic enlarged views of sliding portions (the protruding portion 34 of the holding member 30 and a part of the movable seal member 20) of the seal device 10 according to one embodiment. As shown in Fig. 4 and Fig. 5, in some embodiments, the seal device 10 includes a friction reducing portion 63 that is provided on at least one of the sliding surface 22 of the movable seal member 20 or the opposing surface 35 of the protruding portion 34 of the holding member 30, for reducing friction between the sliding surface 22 and the opposing surface 35.

[0041] According to the above-mentioned embodiment, at least one of the sliding surface 22 of the movable seal member 20 or the opposing surface 35 of the holding member 30 is provided with a friction reducing portion 63 (such as the coating portion 64, 66 or the texturing portion 68 described later) for reducing friction between the sliding surface 22 and the opposing surface 35, so that the surface of the sliding portion can be maintained in a desired state for a longer period of time without replacing the holding member 30 or the movable seal member 20. In addition, since the movable seal member 20 and the holding member 30 are smaller than the stationary members constituting the stationary portion 4, it is easy to apply treatments such as coating, texturing, or surface hardening treatment (such as blasting or shot peening), and it is easy to provide the friction reducing portion 63. Therefore, it is easier to maintain the surface of the sliding portion in a desired state, so that it is easier to maintain a state in which the movable seal member 20 operates stably in the rotating machine 1.

[0042] 4, the friction-reducing portion 63 includes a coating portion 64 provided on at least a portion of the sliding surface 22 of the movable seal member 20 and a coating portion 66 provided on at least a portion of the opposing surface 35 of the protrusion 34. In some embodiments, the friction-reducing portion 63 may include a coating portion provided on one of the sliding surface 22 of the movable seal member 20 or the opposing surface 35 of the protrusion 34.

[0043] The coating portion provided on the sliding surface 22 of the movable seal member 20 or the opposing surface 35 of the protrusion 34 may be formed from a material containing water, a hydrocarbon, a halogenated hydrocarbon such as chloroform or carbon tetrachloride, a cyanide hydrocarbon such as acetonitrile, a ketone such as acetone, an ether such as dioxane, a saturated fatty acid, an unsaturated fatty acid, or an alcohol such as methanol or glycerin. Alternatively, the coating portion may contain a solid lubricant such as boron nitride.

[0044] 4, when the coating portions 64, 66 are provided on both the sliding surface 22 of the movable seal member 20 and the opposing surface 35 of the protruding portion 34 (retaining member 30), the coating portions 66, 66 may be formed from a material including a hard coating material. The hard coating material may be a Co-Cr-Mo based alloy such as T800 or chromium carbide.

[0045] 5, the friction reducing portion 63 includes a texturing portion 68 provided on at least a portion of the sliding surface 22 of the movable seal member 20. The texturing portion 68 may include minute irregularities provided on the sliding surface 22. In some embodiments, the friction reducing portion 63 may include a texturing portion (minute irregularities) provided on the opposing surface 35 of the protrusion 34.

[0046] In some embodiments, the friction reduction portion 63 may include a coating portion provided on one of the sliding surface 22 of the movable sealing member 20 or the opposing surface 35 of the protrusion 34, and a texturing portion provided on the other of the sliding surface 22 of the movable sealing member 20 or the opposing surface 35 of the protrusion 34.

[0047] In some embodiments, the friction reducing portion 63 may include a surface hardening treatment portion (not shown) provided on at least a portion of the sliding surface 22 of the movable seal member 20. The surface hardening treatment portion may be obtained by subjecting at least a portion of the sliding surface 22 of the movable seal member 20 to a blasting treatment or a shot peening treatment. A surface that has been subjected to a surface hardening treatment such as a blasting treatment or a shot peening treatment is harder and has a smaller coefficient of friction than a surface that has not been subjected to such treatment.

[0048] (How to install the sealing device) In some embodiments, with the movable seal member 20 assembled to the retaining member 30, the retaining member 30 can be inserted circumferentially into a groove 5 provided in the stationary portion 4, thereby attaching the seal device 10 to the rotating machine 1.

[0049] In this way, with the movable sealing member 20 assembled to the retaining member 30, the retaining member 30 can be inserted circumferentially into the groove 5 of the stationary part 4, thereby allowing the sealing device 10 including the movable sealing member 20 to be properly installed in the rotating machine 1.

[0050] In some embodiments, an existing seal device provided in a groove 5 (groove extending in the circumferential direction) of the stationary part 4 of the rotary machine 1 may be removed, and then, in a state where a movable seal member 20 different from the existing seal device is assembled to the retaining member 30, the retaining member 30 may be inserted in the circumferential direction into the groove 5 (the groove in which the existing seal device was provided) to attach the seal device 10 (i.e., the seal device may be replaced). The existing seal device does not have to be the seal device 10 according to the above-described embodiment, and may be, for example, a seal device that does not include a retaining member and in which a movable seal member is not held by a retaining member.

[0051] In some embodiments, a groove 5 extending circumferentially may be machined in the stationary portion 4 of an existing rotating machine 1, and then, with the movable seal member 20 assembled to the retaining member 30, the retaining member 30 may be inserted circumferentially into the groove 5 machined in the stationary portion 4 to attach the sealing device 10 (i.e., the rotating machine may be modified).

[0052] The contents described in each of the above embodiments can be understood, for example, as follows.

[0053] (1) At least one embodiment of the sealing device (10) of the present invention comprises: a seal member (e.g., the above-mentioned movable seal member 20) provided between a rotating part (2) and a 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 a circumferential direction and supports the seal member movably along the radial direction; Equipped with The holding member is A base (32) that is received in the groove; a protrusion (34) protruding radially inward from the base portion, The seal member has a sliding surface (22) adjacent to the protrusion in the axial direction and capable of sliding against the protrusion.

[0054] In the above configuration (1), the protrusion of the holding member housed in the groove provided in the stationary part and the sliding surface of the seal member supported by the holding member so as to be movable in the radial direction are adjacent to each other in the axial direction. Therefore, when the seal member moves along the radial direction, the sliding surface of the seal member and the protrusion of the holding member slide against each other. Therefore, when wear occurs in the sliding part (the sliding surface of the seal member and the protrusion of the holding member), the surface of the sliding part can be maintained in a desired state by replacing the holding member and / or the seal member. Since it is easy to maintain the surface of the sliding part in a desired state in this way, it is easy to maintain a state in which the movable seal member operates stably in the rotating machine. In other words, it is easy to maintain stable operation of the seal device in the rotating machine.

[0055] (2) In some embodiments, in the configuration of (1) above, The sealing device comprises: The seal member includes a biasing member (60) that is accommodated in the holding member and is configured to bias the seal member radially outward relative to the holding member along the radial direction.

[0056] According to the above configuration (2), the seal member is biased by the biasing member toward the radially outward direction relative to the holding member housed in the groove of the stationary part, whereby a radially outward force is applied to the seal member, and the seal member can move smoothly along the radial direction in accordance with the operating state of the rotating machine.

[0057] (3) In some embodiments, in the configuration of (2) above, A head portion (52) accommodated in the retaining member; a shaft portion (54) extending along the radial direction and connecting the head portion and the seal member; Equipped with The biasing member is provided between a surface (53) of the head facing inward in the radial direction and a surface (37) of the inner wall surface of the holding member facing outward in the radial direction.

[0058] According to the above configuration (3), the seal member is supported by the holding member via the head and the shaft portion so as to be movable in the radial direction, and a force in the radially outward direction is applied to the seal member via the head and the shaft portion by the biasing member provided between the head and the inner wall surface of the holding member. In this manner, with a simple configuration using the head and the shaft portion, it is possible to apply a radially outward biasing force to the seal member while supporting the seal member so as to be movable along the radial direction.

[0059] (4) In some embodiments, in any one of the configurations (1) to (3) above, The seal member is provided in the axial direction between a high pressure section (6) of the rotary machine through which a high pressure fluid flows and a low pressure section (8) through which a low pressure fluid having a lower pressure than the high pressure fluid flows, The protrusion of the holding member is located closer to the low pressure portion than the sliding surface of the seal member in the axial direction.

[0060] During operation of the rotary machine, a force is applied to the seal member in the axial direction from the high pressure section to the low pressure section due to the pressure difference between the high pressure section and the low pressure section. In this regard, according to the configuration of (4) above, the protruding portion of the holding member is located closer to the low pressure section than the sliding surface of the seal member, so that during operation of the rotary machine, the seal member and the holding member slide with the seal member pressed against the protruding portion of the holding member. Even when the seal member and the holding member slide against each other while pressed against each other in this manner, as described in (1) above, it is easy to maintain the surface of the sliding portion in a desired state, and therefore it is easy to maintain a state in which the movable seal member in the rotary machine operates stably.

[0061] (5) In some embodiments, in any one of the configurations (1) to (4) above, The seal member is provided in the axial direction between a high-pressure portion of the rotary machine through which a high-pressure fluid flows and a low-pressure portion through which a low-pressure fluid having a lower pressure than the high-pressure fluid flows, The seal member has an outer circumferential surface (20b) on which the pressure of the fluid from the high pressure portion acts.

[0062] According to the above configuration (5), since the seal member has an outer peripheral surface on which the pressure of the fluid from the high pressure section acts, the pressure of the fluid from the high pressure section acts on the outer peripheral surface of the seal member during operation of the rotary machine, which imparts a radially inward force to the seal member, enabling the seal member to move smoothly along the radial direction in accordance with the operating state of the rotary machine.

[0063] (6) In some embodiments, in any of the configurations (1) to (5) above, The sealing device comprises: The seal member is provided with a friction reducing portion (63) provided on at least one of the sliding surface of the seal member or an opposing surface of the protrusion that faces the sliding surface and slides against the sliding surface, for reducing friction between the sliding surface and the opposing surface.

[0064] According to the above configuration (6), since at least one of the sliding surface of the seal member or the opposing surface of the retaining member is provided with a friction reducing portion for reducing friction between the sliding surface and the opposing surface, the surface of the sliding portion can be maintained in a desired state for a longer period of time without replacing the retaining member or the seal member. This makes it easier to maintain the surface of the sliding portion in a desired state, and therefore makes it easier to maintain a state in which the movable seal member in the rotating machine operates stably.

[0065] (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) for reducing fluid leakage between the rotating part and the stationary part; Equipped with.

[0066] In the above configuration (7), the protrusion of the holding member housed in the groove provided in the stationary part and the sliding surface of the seal member supported by the holding member so as to be movable in the radial direction are adjacent to each other in the axial direction. Therefore, when the seal member moves along the radial direction, the sliding surface of the seal member and the protrusion of the holding member slide against each other. Therefore, when wear occurs in the sliding part (the sliding surface of the seal member and the protrusion of the holding member), the surface of the sliding part can be maintained in a desired state by replacing the holding member and / or the seal member. Since it is easy to maintain the surface of the sliding part in a desired state in this way, it is easy to maintain a state in which the movable seal member operates stably in the rotating machine. In other words, it is easy to maintain stable operation of the seal device in the rotating machine.

[0067] (8) A method for installing a seal device according to at least one embodiment of the present invention includes the steps of: A method for mounting the seal device according to any one of (1) to (6) above to a rotary machine having a rotating part and a stationary part, comprising: a step of inserting the holding member into the groove provided in the stationary portion along a circumferential direction while the seal member is attached to the holding member; Equipped with.

[0068] According to the above configuration (8), with the seal member assembled to the retaining member, the retaining member can be inserted circumferentially into the groove of the stationary part, whereby the seal device including the seal member can be properly installed in the rotating machine.

[0069] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0070] In this specification, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," do not only strictly represent such a configuration, but also represent 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 indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," 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 describing shapes such as a rectangular shape or a cylindrical shape do not only refer to shapes such as a rectangular shape or a cylindrical shape in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. In addition, in this specification, the expressions "comprise," "include," or "have" a certain element are not exclusive expressions that exclude the presence of other elements. [Explanation of symbols]

[0071] 1 Rotating Machinery 2 Rotating section 4 Stationary part 4a Inner surface 5 grooves 6 High-pressure section 7 Axial protrusion 8 Low voltage section 10 Sealing device 20 Movable seal member 20a Inner surface 20b Outer surface 21 Gap 22 Sliding surface 24 Seal Fin 26 Screw hole 28 Engagement part 30 Retaining member 31 Containment Space 32 Base 33 holes 34 Protrusion 35 Opposite Surface 36 Contact part 37 sides 40 Fixed seal member 42 biasing member 50 Bolt section 52 Head 53 sides 54 Shaft 56 Screw 60 biasing member 62 Disc spring 63 Friction reduction part 64 Coating Department 66 Coating Department 68 Texturing Department O center axis

Claims

1. A seal member provided between a rotating part and a stationary part 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 movably along the radial direction; Equipped with The holding member is A base portion received in the groove; a protruding portion protruding radially inward from the base portion, the seal member has a sliding surface adjacent to the protruding portion in the axial direction and capable of sliding against the protruding portion, a biasing member that is accommodated in the holding member and configured to bias the seal member radially outward relative to the holding member along the radial direction; Sealing device.

2. A head portion accommodated in the holding member; a shaft portion extending along the radial direction and connecting the head portion and the seal member; Equipped with The biasing member is provided between a surface of the head facing inward in the radial direction and a surface of an inner wall surface of the holding member facing outward in the radial direction. The sealing device of claim 1 .

3. The seal member is provided in the axial direction between a high-pressure portion of the rotary machine through which a high-pressure fluid flows and a low-pressure portion through which a low-pressure fluid having a lower pressure than the high-pressure fluid flows, The protruding portion of the holding member is located closer to the low pressure portion than the sliding surface of the seal member in the axial direction. The sealing device according to claim 1 or 2.

4. The seal member is provided in the axial direction between a high-pressure portion of the rotary machine through which a high-pressure fluid flows and a low-pressure portion through which a low-pressure fluid having a lower pressure than the high-pressure fluid flows, The seal member has an outer circumferential surface on which the pressure of the fluid from the high-pressure portion acts. The sealing device according to claim 1 or 2.

5. a friction reducing portion provided on at least one of the sliding surface of the seal member and an opposing surface of the protruding portion that faces the sliding surface and slides against the sliding surface, for reducing friction between the sliding surface and the opposing surface; The sealing device according to claim 1 or 2.

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

7. 1. A method for mounting a seal device to a rotary machine having a rotating part and a stationary part, comprising the steps of: The sealing device comprises: a seal member provided between the rotating portion and the stationary portion 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 movably along the radial direction; Equipped with The holding member is A base portion received in the groove; a protruding portion protruding radially inward from the base portion, the seal member has a sliding surface adjacent to the protruding portion in the axial direction and capable of sliding against the protruding portion, a step of inserting the holding member into the groove provided in the stationary portion along a circumferential direction while the seal member is attached to the holding member; A method for installing a seal device comprising the steps of:

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