Sealing device, rotary machine and method for mounting a sealing device

Abstract

A seal device includes a seal member provided between a rotating portion and a stationary portion of a rotating machine in a radial direction of the rotating machine, and a holding member housed at least partially in a groove provided in the stationary portion in a manner extending in a circumferential direction to support the seal member in a manner movable in the radial direction, the holding member having a base portion housed in the groove and a protruding portion protruding from the base portion toward an inner side in the radial direction, the seal member having a sliding surface adjacent to the protruding portion in an axial direction and slidable with respect to the protruding portion.

Description

Technical Field

[0001] This disclosure relates to sealing devices and rotating machinery, as well as methods for installing sealing devices.

[0002] This application asserts priority based on Japanese Patent Application No. 2022-023470 filed with the Japanese Patent Office on February 18, 2022, the contents of which are incorporated herein by reference. Background Technology

[0003] As a sealing device used to reduce fluid leakage through the gap between the rotating and stationary parts of rotating machinery such as gas turbines and steam turbines, a sealing device with a structure in which the sealing component can move radially according to the operating state of the rotating machinery is sometimes used.

[0004] Patent Document 1 discloses a shaft sealing device provided between a rotor (rotating part) and a stator (stationary part) and having a movable sealing member that can move radially. The movable sealing member is partially housed in a groove fixed to the housing (stationary part) of the stator and is subjected to radial outward force by an elastic member.

[0005] In the shaft sealing device of Patent Document 1, during the start-up and stop operations of the rotating machinery, or during a complete stop, the movable seal member is subjected to a radially outward force by the elastic member, and the gap between the rotor and the movable seal member is maintained at a relatively large level. On the other hand, during the loaded operation of the rotating machinery, the pressure of the working fluid on the high-pressure side acts on the outer peripheral surface of the movable seal member, applying a radially inward force (i.e., a force opposing the force of the elastic member) to the movable seal member. As a result, the movable seal member is displaced radially inward compared to the start-up and stop operations, and the gap between the rotor and the movable seal member is maintained at a relatively small level.

[0006] Existing technical documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-141527 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, in the sealing device described in Patent Document 1, the movable sealing member is partially housed in a groove within the stationary part of the rotating machinery. When the sealing member moves radially, the sealing member and the stationary part slide. When this sliding occurs repeatedly, wear and other damage occur on the sliding surfaces of the sealing member and the stationary part, causing the state of the sliding surfaces (coefficient of friction, etc.) to change from the desired state. When the sliding surfaces change from the desired state in this way, the movable sealing member may not move at the intended timing, causing the operation of the movable sealing member to deviate from the expected direction, and potentially making the operation of the sealing device unstable. As a result, this may lead to a decrease in the efficiency of the rotating machinery and an increased risk of contact between the sealing member and the rotating part.

[0010] In view of the above, at least one embodiment of the present invention aims to provide a sealing device and rotating machinery that can easily maintain stable operation of a sealing device including a movable sealing member, as well as a method for installing the sealing device.

[0011] Methods for solving problems

[0012] At least one embodiment of the sealing device according to the present invention includes:

[0013] A sealing component is disposed radially between the rotating part and the stationary part of the rotating machinery; and

[0014] The retaining member is at least partially housed in a groove provided in the aforementioned stationary portion in a circumferentially extending manner, for supporting the aforementioned sealing member in a manner that allows it to move along the aforementioned radial direction.

[0015] The aforementioned retaining component has:

[0016] The base is housed in the aforementioned groove; and

[0017] The protrusion extends radially inward from the aforementioned base.

[0018] The sealing member described above has a sliding surface that is adjacent to the protrusion in the axial direction and is capable of sliding relative to the protrusion.

[0019] Furthermore, at least one embodiment of the rotating machinery according to the present invention includes:

[0020] Rotating part and stationary part; and

[0021] The aforementioned sealing device is used to reduce fluid leakage between the rotating part and the stationary part.

[0022] Furthermore, at least one embodiment of the present invention relates to a sealing device installation method for installing the aforementioned sealing device in a rotating machine having a rotating part and a stationary part, wherein,

[0023] The installation method of the sealing device includes the step of inserting the retaining member circumferentially into the groove provided in the stationary part while the sealing member is assembled to the retaining member.

[0024] Invention Effects

[0025] According to at least one embodiment of the present invention, a sealing device and a rotating machine that easily maintain stable operation of the sealing device including a movable sealing component are provided, as well as a method for installing the sealing device. Attached Figure Description

[0026] Figure 1 This is a partial schematic cross-sectional view of a rotating machine according to one embodiment.

[0027] Figure 2A This is a schematic cross-sectional view of a sealing device according to one embodiment, along... Figure 1 The sectional view of AA in the diagram.

[0028] Figure 2B This is a schematic cross-sectional view of a sealing device according to one embodiment, along... Figure 1 The sectional view of AA in the diagram.

[0029] Figure 3A This is a schematic cross-sectional view of a sealing device according to one embodiment, along... Figure 1 The sectional view of BB in the image.

[0030] Figure 3B This is a schematic cross-sectional view of a sealing device according to one embodiment, along... Figure 1 The sectional view of BB in the image.

[0031] Figure 4 This is a schematic enlarged view of the sliding portion of a sealing device according to one embodiment.

[0032] Figure 5 This is a schematic enlarged view of the sliding portion of a sealing device according to one embodiment. Detailed Implementation

[0033] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the constituent parts described or shown in the drawings as embodiments are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0034] (Structure of rotating machinery)

[0035] Figure 1 This is a partial schematic cross-sectional view of a rotating machine orthogonal to the axial direction according to one embodiment. Figure 2A and Figure 2BThis is a schematic cross-sectional view of a sealing device according to one embodiment, along... Figure 1 The sectional view of AA in the diagram. Figure 3A and Figure 3B This is a schematic cross-sectional view of a sealing device according to one embodiment, along... Figure 1 A cross-sectional view of BB in [the image]. Figure 2A and Figure 3A This is a diagram showing a sealing device used in the starting and stopping operation of rotating machinery. Figure 2B and Figure 3B This is a diagram showing a sealing device during the operation of rotating machinery under load.

[0036] Some implementations involve rotating machinery such as turbines (gas turbines or steam turbines), compressors, or pumps. For example... Figures 1 to 3B As shown, one embodiment of the rotating machinery 1 includes a rotating part 2 (rotor) and a stationary part 4 (in the outer periphery of the rotating part 2). Figure 1 (Not shown). The rotating part 2 is supported by a bearing (not shown) in a manner that allows it to rotate about the central axis O. The stationary part 4 includes a housing that houses the rotating part 2 and a stationary component supported on the housing. The stationary part 4 may also include a blade ring for supporting stationary blades or a stationary component (e.g., a packing ring or a retaining ring) for supporting sealing components.

[0037] 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 rotating machinery 1. Figures 2A to 3B As shown, the rotating machinery 1 includes a high-pressure section 6 and a low-pressure section 8. The high-pressure section 6 includes a passage for a relatively high-pressure fluid to flow through, and the low-pressure section 8 includes a passage for a lower-pressure fluid to flow through, which is in the high-pressure section 6. The high-pressure section 6 and the low-pressure section 8 are located offset from each other in the axial direction (direction of the central axis O).

[0038] The rotating machinery 1 also includes a sealing device 10 for reducing fluid leakage through the gap between the rotating part 2 and the stationary part 4. Hereinafter, the sealing device 10 according to some embodiments will be described in more detail.

[0039] (Structure of the sealing device)

[0040] like Figures 1 to 3B As shown, the sealing device 10 includes a movable sealing member 20 (sealing member) disposed radially between the rotating part 2 and the stationary part 4 of the rotating machinery 1, and a retaining member 30 for supporting the movable sealing member 20 in a manner capable of radial movement. In one embodiment, as... Figure 1As shown, the movable sealing member 20 and the retaining member 30 extend circumferentially. That is, the movable sealing member 20 and the retaining member 30 may have an arc shape or an annular shape.

[0041] Additionally, in some implementations, such as... Figure 1 As shown, the sealing device 10 may include a fixed sealing member 40 arranged adjacent to the movable sealing member 20 in the circumferential direction. The fixed sealing member 40 is configured to be substantially non-radial. Figure 1 In the exemplary embodiment shown, the sealing device 10 includes a movable sealing member 20 disposed above and below the rotating part 2 in the vertical direction, and a plurality of fixed sealing members 40 disposed on the side of the rotating part 2 adjacent to the circumferential end of the movable sealing member 20.

[0042] like Figures 2A to 3B As shown, the movable sealing member 20 is disposed axially between the high-pressure section 6 and the low-pressure section 8 of the rotating machinery 1. Figures 2A to 3B In the exemplary embodiment shown, a plurality of sealing fins 24 are provided on the inner circumferential surface 20a of the movable sealing member 20 facing the rotating part 2. In some embodiments, a plurality of sealing fins may also be provided on the outer circumferential surface of the rotating part 2 (i.e., the surface facing the movable sealing member 20).

[0043] The movable sealing member 20 has an outer peripheral surface 20b facing the stationary part 4, and a gap 21 is formed radially between the outer peripheral surface 20b and the stationary part 4, which allows communication with the high-pressure part 6. That is, the pressure of the fluid from the high-pressure part 6 acts on the outer peripheral surface 20b of the movable sealing member 20.

[0044] The retaining member 30 is at least partially housed in a groove 5 provided in the stationary part 4, which extends circumferentially. The groove 5 is recessed radially outward from the inner circumferential surface 4a of the stationary part 4. The groove 5 can be provided in the housing (stationary part 4) housing the rotating part 2 of the rotating machinery 1 or in a stationary member (stationary part 4) supported by that housing. The groove 5 can also be provided, for example, in the packing ring (stationary part 4) of a steam turbine or the retaining ring (stationary part 4) of a gas turbine. Figures 2A to 3B In the exemplary embodiment shown, the retaining member 30 includes a base 32 received in the groove 5 and a protrusion 34 projecting radially inward from the base 32.

[0045] The axial length of the portion of the retaining member 30 that is received in the groove 5 (in the illustrated embodiment, the axial length of the base 32) is slightly shorter than the axial length of the groove 5. Therefore, with axial clearance between the groove 5 and the retaining member 30, the retaining member 30 is positioned axially by the groove 5.

[0046] The retaining component 30 can be located in at least a portion of the circumferential region (e.g.) Figure 2A and Figure 2B The portion shown has an abutment portion 36 that abuts against an axially protruding portion 7 in the groove 5 of the stationary portion 4. Additionally, within the groove 5, a force-applying member 42 can be provided on the radially outer side of the retaining member 30 and the radially inner side of the stationary portion 4 for applying force to the retaining member 30 radially inward. The radial position of the retaining member 30 can be restricted by the force-applying member 42 applying force to the radially inward and the abutment portion 36 abutting against the axially protruding portion 7, thereby achieving radial positioning of the retaining member 30.

[0047] In some implementations, for example, Figure 2A and Figure 2B As shown, the sealing device 10 includes a head 52 housed in a retaining member 30 and a shaft 54 ​​extending radially and connecting the head 52 to a movable sealing member 20. The movable sealing member 20 is supported on the retaining member 30 in a radially movable manner via the shaft 54 ​​and the head 52 connected to the movable sealing member 20. The head 52 is housed within a receiving space 31 provided in the retaining member 30. The shaft 54 ​​is provided in a hole 33 of the retaining member 30, extending through to communicate with the receiving space 31. Figure 2A and Figure 2B In the exemplary embodiment shown, the sealing device 10 includes a bolt portion 50, of which the head 52 and shaft portion 54 are part. In some embodiments, the head 52 and shaft portion 54 may also be composed of separate components. The head 52 and / or shaft portion 54 may also include a pin.

[0048] Here, the axial length of the hole 33 is smaller than the diameter of the head 52, but larger than the diameter of the shaft 54. Furthermore, the radial length of the receiving space 31 is longer than the radial length of the head 52. Therefore, with the head 52 not dislodged from the receiving space 31, the head 52 and the shaft 54 ​​(bolt 50) can move radially within the receiving space 31, and the movable sealing member 20 connected to the shaft 54 ​​(bolt 50) can move radially together with the head 52 and the shaft 54 ​​(bolt 50). Additionally, as... Figure 2A and Figure 2B As shown, the shaft portion 54 may have one end with a threaded portion 56 that engages with a threaded hole 26 provided in the movable seal member 20. In some embodiments, the shaft portion 54 (e.g., a pin) may also be connected to the movable seal member 20 by thermoforming or welding.

[0049] In some embodiments, the head 52 and shaft portion 54 (bolt portion 50) described above may be provided at multiple positions in the circumferential direction.

[0050] In some embodiments, the sealing device 10 may include a force-applying member 60 configured to apply force to the movable sealing member 20 radially outward relative to the retaining member 30 (see reference). Figure 2A , Figure 2B ).like Figure 2A and Figure 2B As shown, the force-applying member 60 can be disposed between the radially inward-facing surface 53 of the head 52 and the radially outward-facing surface 37 of the inner wall surface of the retaining member 30 forming the receiving space 31. Figure 2A and Figure 2B In the exemplary embodiment shown, the force-applying component 60 includes a plurality of disc springs 62.

[0051] In some embodiments, the aforementioned force-applying components 60 may be provided at multiple locations in the circumferential direction.

[0052] Additionally, in locations where the force-applying component 60 or the head 52 and shaft portion 54 (bolt portion 50) are not provided in the circumferential direction, for example, Figure 3A and Figure 3B As shown, the movable sealing member 20 can be partially received in the groove 5 of the stationary part 4. The movable sealing member 20 may include an engaging portion 28 located radially between the base 32 of the retaining member 30 and the axial protrusion 7 of the stationary part 4, and capable of engaging with the axial protrusion 7. Figure 3B As shown, the engaging portion 28 engages with the axial protrusion 7 when the movable sealing member 20 is located radially inward.

[0053] Here, the operation of the sealing device 10 described above will be briefly explained. During the starting and stopping operation or during the stopping of the rotating machinery 1, the movable sealing member 20 is subjected to radial outward force by the force-applying member 60, and the gap between the rotating part 2 and the movable sealing member 20 (or the sealing fin 24) is maintained at a large distance (see reference). Figure 2A and Figure 3A When the load on the rotating machinery 1 increases, the pressure difference between the high-pressure section 6 and the low-pressure section 8 increases. This creates a pressure difference between the pressure acting on the outer peripheral surface 20b of the movable sealing member 20 (the pressure of the high-pressure fluid in the high-pressure section 6) and the pressure acting on the inner peripheral surface 20a (the pressure that decreases as it moves from the high-pressure side to the low-pressure side). If the force applied to the movable sealing member 20 in a radially inward direction due to this pressure difference is stronger than the force applied by the force-applying member 60 in a radially outward direction, the movable sealing member 20 moves in a radially inward position, and the gap between the rotating part 2 and the movable sealing member 20 (or the sealing fin 24) decreases (see reference). Figure 2B and Figure 3BDuring the operation of the rotating machinery 1 under load (e.g., under rated load), the pressure of the high-pressure fluid from the high-pressure section 6 continuously acts on the outer peripheral surface 20b of the movable sealing member 20, maintaining the aforementioned pressure difference. Therefore, the gap between the rotating part 2 and the movable sealing member 20 (or sealing fin 24) remains small (see reference). Figure 2B and Figure 3B ).

[0054] In some implementations, for example, Figures 2A to 3B As shown, the movable sealing member 20 has a sliding surface 22 that is axially adjacent to and slidable relative to the protrusion 34 of the retaining member 30. The protrusion 34 has an opposing surface 35 that is axially opposed to the sliding surface 22 of the movable sealing member 20. That is, the sliding surface 22 of the movable sealing member 20 and the opposing surface 35 of the protrusion 34 are slidable relative to each other.

[0055] In addition, Figures 2A to 3B In the illustrated embodiment, the protrusion 34 of the retaining member 30 is located axially closer to the low-pressure portion 8 than the sliding surface 22 of the movable sealing member 20 (i.e., the sliding surface 22 of the movable sealing member 20 is located closer to the high-pressure portion 6 than the protrusion 34). Therefore, during the operation of the rotating machinery 1, a force is applied axially to the movable sealing member 20 from the high-pressure portion 6 side toward the low-pressure portion 8 side by means of the pressure difference between the high-pressure portion 6 and the low-pressure portion 8. Thus, when the movable sealing member 20 is pressed against the protrusion 34 of the retaining member 30, the movable sealing member 20 slides relative to the retaining member 30.

[0056] In conventional sealing devices, i.e., sealing devices that house movable sealing components within grooves in stationary parts of rotating machinery (such as packing rings, retaining rings, etc.) (i.e., sealing devices without retaining components), the movable sealing component slides relative to the stationary part (the stationary part with the groove housing the sealing component) as the movable sealing component moves radially. If this sliding occurs repeatedly, wear occurs on the sliding surfaces of the sealing component and the stationary part, causing the condition of the sliding surfaces (coefficient of friction, etc.) to change from the desired state. If the sliding surfaces change from the desired state in this way, the movable sealing component may not move at the intended timing, causing the operation of the movable sealing component to deviate from expectations, and the operation of the sealing device may become unstable. As a result, this may lead to a decrease in the efficiency of the rotating machinery and an increased risk of contact between the sealing component and the rotating part. Alternatively, it is possible to maintain the desired state of the sliding surfaces by replacing the worn components; however, the worn components (such as packing rings, retaining rings) are large components constituting the stationary part of the rotating machinery, and such large components are sometimes difficult to replace easily from a cost perspective.

[0057] Regarding this, in the above embodiment, the protrusion 34 of the retaining member 30, which is received in the groove 5 of the stationary part 4, and the sliding surface 22 of the movable sealing member 20, which is supported on the retaining member 30 in a radially movable manner, are axially adjacent to each other. Therefore, when the movable sealing member 20 moves radially, the sliding surface 22 of the movable sealing member 20 slides against the protrusion 34 of the retaining member 30. Thus, in the event of wear on the sliding parts (the sliding surface 22 of the movable sealing member 20 and the protrusion 34 of the retaining member 30), the surface of the sliding parts can be maintained in a desired state (e.g., a state with a desired coefficient of friction) by replacing the retaining member 30 and / or the movable sealing member 20. Since it is easy to maintain the surface of the sliding parts in a desired state, it is easy to maintain the state in which the movable sealing member 20 operates stably in the rotating machine 1. That is, it is easy to maintain the stable operation of the sealing device 10 in the rotating machine 1.

[0058] Furthermore, in the above embodiment, the movable sealing member 20 is subjected to radially outward force by the force-applying member 60 relative to the retaining member 30 housed in the groove 5 of the stationary part 4. Thus, since the force-applying member 60 applies a radially outward force to the movable sealing member 20, the movable sealing member 20 can move smoothly radially according to the operating state of the rotating machinery 1.

[0059] Furthermore, in the above embodiment, the movable sealing member 20 is supported on the retaining member 30 in a radially movable manner via the head 52 and the shaft portion 54 (bolt portion) 50. A force-applying member 60, disposed between the head 52 and the inner wall surface (surface 37) of the retaining member 30, applies a radially outward force to the movable sealing member 20 via the head 52 and the shaft portion 54 (bolt portion 50). Thus, a radially outward force can be applied to the movable sealing member 20 while simultaneously supporting it in a radially movable manner using a simple structure employing the head 52 and the shaft portion 54 (bolt portion 50).

[0060] Furthermore, in conventional sealing devices (i.e., sealing devices that do not include retaining members), the force-applying member for applying force radially outward to the movable sealing member is radially positioned between the movable sealing member and the stationary member. Consequently, when installing a sealing device on rotating machinery, inserting the movable sealing member into the groove circumferentially is sometimes hindered by the preload (radial force) applied to the force-applying member.

[0061] In this regard, in the above embodiment, the movable sealing member 20 is supported by the retaining member 30, and the force-applying member 60 for applying force to the movable sealing member 20 radially outward is housed in the retaining member 30. Therefore, the sealing device 10, including the movable sealing member 20, can be installed on the rotating machine 1 by inserting the retaining member 30 circumferentially into the groove 5 of the stationary part 4 with the movable sealing member 20 and the force-applying member 60 assembled in the retaining member 30. Therefore, even when a relatively large preload is applied to the force-applying member 60, the preload will not hinder the insertion of the sealing device 10 into the groove, and the sealing device 10 can be smoothly installed on the rotating machine 1.

[0062] Figure 4 and Figure 5 These are schematic enlarged views of the sliding portion (protrusion 34 of retaining member 30 and part of movable sealing member 20) of the sealing device 10 according to one embodiment. Figure 4 and Figure 5 As shown, in some embodiments, the sealing device 10 includes a friction reduction portion 63 provided on at least one of the sliding surface 22 of the movable sealing member 20 and the opposing surface 35 of the protrusion 34 of the retaining member 30, and for reducing friction between the sliding surface 22 and the opposing surface 35.

[0063] According to the above-described embodiment, since at least one of the sliding surface 22 of the movable sealing member 20 and the opposing surface 35 of the retaining member 30 is provided with a friction-reducing portion 63 (such as a coating portion 64, 66, or a textured portion 68 described later) to reduce friction between the sliding surface 22 and the opposing surface 35, the surface of the sliding portion can be maintained in a desired state for a longer period of time even without replacing the retaining member 30 or the movable sealing member 20. Furthermore, since the movable sealing member 20 and the retaining member 30 are smaller than the stationary members constituting the stationary portion 4, it is easy to perform coating, texturing, or surface hardening treatments (such as sandblasting 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, and thus easier to maintain the state in which the movable sealing member 20 operates stably in the rotating machinery 1.

[0064] exist Figure 4 In the exemplary embodiment shown, the friction reduction portion 63 includes a coating portion 64 disposed on at least a portion of the sliding surface 22 of the movable sealing member 20 and a coating portion 66 disposed on at least a portion of the opposing surface 35 of the protrusion 34. In some embodiments, the friction reduction portion 63 may also include a coating portion disposed on one of the sliding surface 22 of the movable sealing member 20 and the opposing surface 35 of the protrusion 34.

[0065] The coating portion disposed on the sliding surface 22 or the opposing surface 35 of the protrusion 34 of the movable sealing member 20 may be formed of a material comprising water, hydrocarbons, halogenated hydrocarbons such as chloroform or carbon tetrachloride, cyaninated hydrocarbons such as acetonitrile, ketones such as acetone, ethers such as dioxane, saturated fatty acids, unsaturated fatty acids, or alcohols such as methanol or glycerol. Alternatively, the coating portion may also comprise a solid lubricant such as boron nitride.

[0066] In such Figure 4 When coating portions 64 and 66 are provided on both the sliding surface 22 of the movable sealing member 20 and the facing surface 35 of the protrusion 34 (retaining member 30) as shown, the coating portions 66 and 66 can be formed of a material containing a hard coating material. The hard coating material can be a Co-Cr-Mo alloy such as T800 or chromium carbide.

[0067] exist Figure 5 In the exemplary embodiment shown, the friction reduction portion 63 includes a textured portion 68 provided on at least a portion of the sliding surface 22 of the movable sealing member 20. The textured portion 68 may include fine irregularities provided on the sliding surface 22. In some embodiments, the friction reduction portion 63 may also include a textured portion (fine irregularities) provided on the opposing surface 35 of the protrusion 34.

[0068] In some embodiments, the friction reduction portion 63 may also include a coating portion disposed on one of the sliding surface 22 of the movable sealing member 20 and the opposing surface 35 of the protrusion 34, and a textured portion disposed on the other of the sliding surface 22 of the movable sealing member 20 and the opposing surface 35 of the protrusion 34.

[0069] In some embodiments, the friction reduction portion 63 may also include a surface-hardening treatment portion (not shown) disposed on at least a portion of the sliding surface 22 of the movable sealing member 20. The surface-hardening treatment portion can be obtained by sandblasting or shot peening at least a portion of the sliding surface 22 of the movable sealing member 20. The surface subjected to surface hardening treatment such as sandblasting or shot peening is harder than the surface that has not been treated in this way, and has a lower coefficient of friction.

[0070] (Installation method of sealing device)

[0071] In some embodiments, the sealing device 10 can be installed on the rotating machine 1 by inserting the retaining member 30 circumferentially into the groove 5 provided in the stationary part 4 while the movable sealing member 20 is assembled in the retaining member 30.

[0072] Thus, by inserting the retaining member 30 into the groove 5 of the stationary part 4 circumferentially while the movable sealing member 20 is assembled with the retaining member 30, the sealing device 10 containing the movable sealing member 20 can be appropriately installed on the rotating machine 1.

[0073] In some embodiments, the existing sealing device in the groove 5 (the groove extending circumferentially) of the stationary part 4 of the rotating machinery 1 can be removed. Then, with the movable sealing member 20 (different from the existing sealing device) assembled in the retaining member 30, the retaining member 30 is inserted circumferentially into the groove 5 (the groove where the existing sealing device is located) to install the sealing device 10 (i.e., the sealing device can also be replaced). The existing sealing device may not be the sealing device 10 involved in the above embodiments. For example, it may be a sealing device that does not include a retaining member and the movable sealing member is not held in the retaining member.

[0074] In some embodiments, a groove 5 extending circumferentially may be machined in the stationary part 4 of the existing rotating machinery 1, and then, with the movable sealing member 20 assembled in the retaining member 30, the retaining member 30 may be inserted circumferentially into the groove 5 machined in the stationary part 4 to install the sealing device 10 (i.e., the rotating machinery may also be modified).

[0075] The contents described in the above embodiments are as follows.

[0076] (1) The sealing device (10) according to at least one embodiment of the present invention includes:

[0077] A sealing component (such as the movable sealing component 20 described above) is disposed radially between the rotating part (2) and the stationary part (4) of the rotating machinery (1); and

[0078] The retaining member (30) is at least partially housed in a groove (5) provided in the stationary portion in a manner extending circumferentially, for supporting the sealing member in a manner that allows it to move radially.

[0079] The aforementioned retaining component has:

[0080] The base (32) is housed in the aforementioned groove; and

[0081] The protrusion (34) protrudes radially inward from the base.

[0082] The sealing member described above has a sliding surface (22) that is adjacent to the protrusion in the axial direction and is capable of sliding relative to the protrusion.

[0083] In the structure described in (1) above, the protrusion of the retaining member housed in the groove of the stationary part and the sliding surface of the sealing member supported on the retaining member in a radially movable manner are axially adjacent to each other. Therefore, when the sealing member moves radially, the sliding surface of the sealing member slides against the protrusion of the retaining member. Thus, if wear occurs in the sliding part (the sliding surface of the sealing member and the protrusion of the retaining member), the surface of the sliding part can be maintained in a desired state by replacing the retaining member and / or the sealing member. Since it is easy to maintain the surface of the sliding part in a desired state, it is easy to maintain the stable operation of the movable sealing member in the rotating machinery. That is, it is easy to maintain the stable operation of the sealing device in the rotating machinery.

[0084] (2) In some embodiments, in the structure described in (1) above,

[0085] The sealing device includes a force-applying member (60), which is housed in the retaining member and is configured to apply force to the sealing member radially outward relative to the retaining member.

[0086] According to the structure described in (2) above, the sealing member is subjected to radially outward force by the force-applying member relative to the retaining member housed in the groove of the stationary part. As a result, by applying a radially outward force to the sealing member, the sealing member can move smoothly radially according to the operating state of the rotating machinery.

[0087] (3) In some embodiments, the structure described in (2) above includes:

[0088] The head (52) is housed in the aforementioned retaining component;

[0089] The shaft portion (54), extending radially as described above, connects the head to the sealing member.

[0090] The force-applying component is disposed between the radially inner surface (53) of the head and the radially outer surface (37) of the inner wall surface of the retaining component.

[0091] According to the structure described in (3) above, the sealing member is supported on the retaining member in a radially movable manner via the head and shaft, and a force-applying member disposed between the head and the inner wall surface of the retaining member applies a force toward the radially outward to the sealing member via the head and shaft. In this way, the sealing member can be supported in a radially movable manner while applying a force toward the radially outward to the sealing member using a simple structure that uses the head and shaft.

[0092] (4) In some embodiments, in any of the structures described in (1) to (3) above,

[0093] The aforementioned sealing component is disposed axially between the high-pressure section (6) in the aforementioned rotating machinery, which supplies high-pressure fluid flow, and the low-pressure section (8), which supplies low-pressure fluid with a lower pressure than the aforementioned high-pressure fluid.

[0094] The protrusion of the retaining member is located in the axial direction closer to the low-pressure portion than the sliding surface of the sealing member.

[0095] During the operation of rotating machinery, the pressure difference between the high-pressure section and the low-pressure section applies an axial force to the sealing member from the high-pressure section side toward the low-pressure section side. Regarding this, according to the structure described in (4) above, since the protrusion of the retaining member is located closer to the low-pressure section than the sliding surface of the sealing member, the sealing member slides relative to the retaining member when the rotating machinery is running and the sealing member is pressed against the protrusion of the retaining member. Even in this case where the sealing member slides relative to the retaining member while being pressed against it, as described in (1) above, it is easy to maintain the surface of the sliding part in a desired state, thus easily maintaining the stable operation of the movable sealing member in the rotating machinery.

[0096] (5) In some embodiments, in any of the structures described in (1) to (4) above,

[0097] The aforementioned sealing component is disposed axially between a high-pressure section in the aforementioned rotating machinery that receives high-pressure fluid and a low-pressure section that receives low-pressure fluid that is lower in pressure than the high-pressure fluid.

[0098] The sealing component described above has an outer peripheral surface (20b) subjected to pressure from the fluid in the high-pressure section.

[0099] According to the structure described in (5), since the sealing member has an outer peripheral surface subjected to the pressure of the fluid from the high-pressure section, the pressure of the fluid from the high-pressure section acts on the outer peripheral surface of the sealing member during the operation of the rotating machinery. As a result, a force is applied to the sealing member inward toward the radial direction, and the sealing member can move smoothly in the radial direction according to the operating state of the rotating machinery.

[0100] (6) In some embodiments, in any of the structures described in (1) to (5) above,

[0101] The sealing device described above includes a friction reduction part (63), which is disposed on at least one of the sliding surface and the protrusion of the sealing member, which are facing the sliding surface and sliding relative to the sliding surface, and is used to reduce the friction between the sliding surface and the opposing surface.

[0102] According to the structure described in (6) above, since at least one of the sliding surface of the sealing member and the opposing surface of the retaining member is provided with a friction-reducing part to reduce friction between the sliding surface and the opposing surface, the surface of the sliding part can be maintained in the desired state for a longer period of time even without replacing the retaining member or the sealing member. As a result, it is easier to maintain the surface of the sliding part in the desired state, and therefore it is easier to maintain the state in which the movable sealing member operates stably in rotating machinery.

[0103] (7) The rotating machinery (1) according to at least one embodiment of the present invention comprises:

[0104] Rotating part (2) and stationary part (4); and

[0105] The sealing device (10) described in any one of (1) to (6) above is used to reduce fluid leakage between the rotating part and the stationary part.

[0106] In the structure described in (7) above, the protrusion of the retaining member housed in the groove of the stationary part and the sliding surface of the sealing member supported on the retaining member in a radially movable manner are axially adjacent to each other. Therefore, when the sealing member moves radially, the sliding surface of the sealing member slides against the protrusion of the retaining member. Thus, if wear occurs in the sliding part (the sliding surface of the sealing member and the protrusion of the retaining member), the surface of the sliding part can be maintained in a desired state by replacing the retaining member and / or the sealing member. Since it is easy to maintain the surface of the sliding part in a desired state, it is easy to maintain the stable operation of the movable sealing member in rotating machinery. That is, it is easy to maintain the stable operation of the sealing device in rotating machinery.

[0107] (8) The sealing device installation method according to at least one embodiment of the present invention is used to install the sealing device described in any one of (1) to (6) above into a rotating machine having a rotating part and a stationary part, wherein,

[0108] The installation method of the sealing device includes the following steps: with the sealing component assembled on the retaining component, the retaining component is inserted circumferentially into the groove provided in the stationary part.

[0109] According to the structure described in (8), by inserting the retaining member into the groove of the stationary part circumferentially while the sealing member is assembled in the retaining member, the sealing device containing the sealing member can be appropriately installed in the rotating machinery.

[0110] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and also includes ways obtained by modifying the above embodiments and ways obtained by appropriately combining these ways.

[0111] In this specification, expressions such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," which indicate relative or absolute configurations, not only strictly indicate such configurations, but also indicate the state of relative displacement by angle or distance with tolerances or to the extent that the same function can be obtained.

[0112] For example, expressions such as "same," "equal," and "homogeneous" that indicate the state of equality of things not only indicate a state of strict equality, but also indicate a state of difference in the degree to which there is a tolerance or the ability to obtain the same function.

[0113] Furthermore, in this specification, the terms "quadrilateral shape," "cylindrical shape," etc., refer not only to quadrilateral shapes and cylindrical shapes in a strict geometric sense, but also to shapes that include concave and convex parts, chamfered parts, etc., within the range that can achieve the same effect.

[0114] Furthermore, in this specification, the expressions "having," "comprising," or "possessing" a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0115] Explanation of reference numerals in the attached figures

[0116] 1 Rotating machinery

[0117] 2 Rotating part

[0118] 4. Stationary section

[0119] 4a Inner circumferential surface

[0120] 5 slots

[0121] 6. High-voltage section

[0122] 7. Axial protrusion

[0123] 8. Low-pressure section

[0124] 10 Sealing device

[0125] 20 Movable sealing components

[0126] 20a Inner circumferential surface

[0127] 20b outer perimeter

[0128] 21 gap

[0129] 22 Sliding surface

[0130] 24 Sealing fins

[0131] 26 Threaded hole

[0132] 28. Card-connecting section

[0133] 30 Retaining components

[0134] 31 Containment Space

[0135] 32 Base

[0136] 33 holes

[0137] 34. Protrusion

[0138] 35 Opposing planes

[0139] 36 abutment

[0140] 37 sides

[0141] 40 Fixed sealing components

[0142] 42 Force-applying components

[0143] 50 Bolt section

[0144] 52 heads

[0145] 53 pages

[0146] 54 Shaft section

[0147] 56 thread

[0148] 60 Force-applying components

[0149] 62 Disc Spring

[0150] 63 Friction Reduction Section

[0151] 64 Coating Section

[0152] 66 Coating Section

[0153] 68 Texturing section

[0154] O is the central axis.

Claims

1. A sealing device comprising: A sealing component is disposed radially between the rotating part and the stationary part of the rotating machinery; and A retaining member, at least partially housed in a groove provided in the stationary portion in a circumferentially extending manner, is used to support the sealing member in a manner capable of moving along the radial direction. The retaining component has: The base is received in the groove; and The protrusion extends radially inward from the base. The sealing member has a sliding surface that is axially adjacent to the protrusion and capable of sliding relative to the protrusion. The sealing device includes a force-applying component housed in the retaining component, configured to apply force to the sealing component radially outward relative to the retaining component. The retaining member includes an abutting portion configured to abut against an axially protruding portion of the stationary portion, the axially protruding portion projecting axially within the groove. The force-applying component is located on the radial outer side of the abutment portion.

2. The sealing device according to claim 1, wherein, The sealing device includes: The head is housed in the retaining member; and The shaft portion, extending radially, connects the head to the sealing member. The force-applying component is disposed between the radially inward-facing surface of the head and the radially outward-facing surface of the inner wall of the retaining component.

3. The sealing device according to claim 1 or 2, wherein, The sealing component is axially disposed between a high-pressure section in the rotating machinery that receives high-pressure fluid and a low-pressure section that receives low-pressure fluid of lower pressure. The protrusion of the retaining member is located in the axial direction closer to the low-pressure portion than the sliding surface of the sealing member.

4. The sealing device according to claim 1 or 2, wherein, The sealing component is axially disposed between a high-pressure section in the rotating machinery that receives high-pressure fluid and a low-pressure section that receives low-pressure fluid of lower pressure. The sealing component has an outer peripheral surface subjected to pressure from the fluid in the high-pressure section.

5. The sealing device according to claim 1 or 2, wherein, The sealing device includes a friction reduction section disposed on at least one of the sliding surface and the protrusion of the sealing member, which are opposite to and slide relative to the sliding surface, for reducing friction between the sliding surface and the opposite surface.

6. The sealing device according to claim 2, wherein, The sealing device has a bolt portion, which has a head and a shaft portion.

7. The sealing device according to claim 6, wherein, The base houses the head so that it can move radially.

8. The sealing device according to claim 7, wherein, The force-applying component is a disc spring that is passed through the shaft.

9. A rotating machine, comprising: Rotating part and stationary part; and The sealing device according to claim 1 or 2 is used to reduce fluid leakage between the rotating part and the stationary part.

10. A method for installing a sealing device, for installing the sealing device of claim 1 or 2 onto a rotating machine having a rotating part and a stationary part. The installation method of the sealing device includes the following steps: with the sealing component assembled on the retaining component, the retaining component is inserted circumferentially into the groove provided in the stationary part.

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