Lubricant sealing device and rotating machinery
The lubricant sealing device with deformable annular portions addresses lubricant leakage issues by forming a closed space, ensuring stable operation of bearing devices and machinery through effective lubrication.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MITSUBISHI HEAVY IND LTD
- Filing Date
- 2022-10-07
- Publication Date
- 2026-05-22
AI Technical Summary
Existing lubricant sealing devices with pressure relief passages allow new lubricant to leak out, leading to insufficient lubrication and unstable operation of bearing devices.
A lubricant sealing device with deformable annular portions on either the rotating or stationary side members that close under pressure to prevent lubricant leakage, using a labyrinth seal structure to maintain a closed space.
The device effectively suppresses lubricant leakage during filling, ensuring a stable operation of the bearing device and rotating machinery by maintaining a predetermined lubricant amount in the sealing space.
Smart Images
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Abstract
Description
Technical Field
[0005] , ,
[0001] The present disclosure relates to a lubricant sealing device and a rotating machine.
Background Art
[0002] A bearing device for rotatably supporting a rotating side member (rotating shaft) of a rotating machine and a stationary side member (housing, etc.) is provided between the rotating side member and the stationary side member. In order to maintain smooth operation of the bearing device, a lubricant is supplied to the bearing device. As an example of the lubricant, a highly viscous substance called grease may be used. A lubricant sealing device is used to hold the grease around the bearing device itself.
[0003] As a specific example of the lubricant sealing device, the one described in Patent Document 1 below is known. The device according to Patent Document 1 below is configured to seal the lubricant between the bearing device by sealing between the rotating side member and the stationary side member. Further, in this device, when filling the sealing space with the lubricant, a pressure relief flow path for releasing the air (pressure) in the sealing space is formed. When filling the sealing space with the lubricant, it is necessary to supply new lubricant at high pressure to push out the old lubricant in the sealing space to the outside through a discharge port different from the pressure relief flow path.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] However, in the case of a device like the one described in Patent Document 1, where a pressure relief passage is also provided, new lubricant may leak to the outside through the pressure relief passage instead of the outlet. As a result, the predetermined amount of lubricant may not be supplied into the sealed space, which could hinder the stable operation of the bearing device.
[0006] This disclosure was made to solve the above problems, and aims to provide a lubricant sealing device and a rotating machine that can further stabilize the operation of a bearing device by suppressing the leakage of lubricant during filling. [Means for solving the problem]
[0007] To solve the above problems, the lubricant sealing device according to the present disclosure is a lubricant sealing device for holding lubricant supplied to a bearing device provided between a rotating shaft rotatable around an axis and a stationary member surrounding the rotating shaft from the outer circumference, in a space between the bearing device and the rotating shaft, comprising: a rotating-side sealing member provided on the outer circumferential surface of the rotating shaft and having a rotating-side annular portion that forms an annular shape with respect to the axis and protrudes outward; and a stationary-side sealing member provided on the stationary member and having a stationary-side annular portion that faces the rotating-side annular portion non-contacting it and thereby forms a closed space between it and the rotating-side annular portion, wherein either the rotating-side annular portion or the stationary-side annular portion is deformable by the pressure when the lubricant is filled into the space so as to abut the other from the axial direction.
[0008] The rotating machine according to this disclosure comprises the rotating shaft, the stationary side member, the bearing device provided between the rotating shaft and the stationary side member, and the lubricant seal device described above. [Effects of the Invention]
[0009] According to this disclosure, it is possible to provide a lubricant sealing device and a rotating machine that can further stabilize the operation of a bearing device by suppressing the leakage of lubricant during filling. [Brief explanation of the drawing]
[0010] [Figure 1] This is a cross-sectional view showing the configuration of a rotating machine and a lubricant sealing device according to the first embodiment of this disclosure. [Figure 2] This is an explanatory diagram showing an example of the operation of a lubricant sealing device according to the first embodiment of this disclosure. [Figure 3] This is a cross-sectional view showing a first modified example of a lubricant sealing device according to the first embodiment of this disclosure. [Figure 4] This is a cross-sectional view showing a second modified example of a lubricant sealing device according to the first embodiment of this disclosure. [Figure 5] This figure shows a second modified example of a lubricant sealing device according to the first embodiment of the present disclosure, and is an explanatory diagram showing an example of the operation of the lubricant sealing device. [Figure 6] This is a cross-sectional view showing a third modified example of a lubricant sealing device according to the first embodiment of this disclosure. [Figure 7] This is a cross-sectional view showing a fourth modified example of a lubricant sealing device according to the first embodiment of this disclosure. [Figure 8] This is a cross-sectional view showing the configuration of a lubricant sealing device according to a second embodiment of the present disclosure. [Figure 9] This is a cross-sectional view showing a modified example of a lubricant sealing device common to each embodiment of the present disclosure. [Modes for carrying out the invention]
[0011] <First Embodiment> (Configuration of a rotating machine) Hereinafter, a rotating machine 1 and a lubricant seal device 2 according to the first embodiment of this disclosure will be described with reference to Figures 1 and 2. The rotating machine 1 is, for example, a gas turbine, a steam turbine, or other mechanical device, and comprises a rotating shaft 10, a housing 11 (stationary side member), a bearing device 3, and a lubricant seal device 2.
[0012] The rotating shaft 10 is columnar and extends along the axis O, and is rotatable about the axis O. The housing 11 is cylindrical and surrounds the rotating shaft 10 from the outer peripheral side. A bearing device 3 is provided between the outer peripheral surface of the rotating shaft 10 and the inner peripheral surface of the housing 11.
[0013] The bearing device 3 is, for example, a ball bearing. The bearing device 3 has an inner ring 31, rolling elements 32, and an outer ring 33. The inner ring 31 is annular with the axis O as the center. The outer ring 33 is annular and surrounds the inner ring 31 from the outer peripheral side. Between the inner ring 31 and the outer ring 33, a plurality of rolling elements 32 arranged at intervals in the circumferential direction are interposed. The rolling elements 32 are spherical. The inner ring 31 is fixed to the outer peripheral surface of the rotating shaft 10. The outer ring 33 is fixed to the inner peripheral surface of the housing 11.
[0014] When the rotating shaft 10 rotates about the axis O, the inner ring 31 fixed to the rotating shaft 10 rotates relative to the outer ring 33. At this time, the plurality of rolling elements 32 roll between the inner ring 31 and the outer ring 33. As a result, the frictional resistance between the housing 11 and the rotating shaft 10 is reduced, and the rotating shaft 10 is supported so as to be relatively rotatable with respect to the housing 11. Also, the bearing device 3 bears the radial load by the rotating shaft 10.
[0015] Note that as the bearing device 3, it is also possible to use roller bearings other than ball bearings or needle bearings. That is, the bearing device 3 may be any device as long as it can support the rotating shaft 10 rotatably.
[0016] (Configuration of Lubricant Sealing Device) The lubricant sealing devices 2 are provided one on each side in the direction of the axis O with the bearing device 3 interposed therebetween. Since these pair of lubricant sealing devices 2 have a line-symmetric structure with respect to the bearing device 3, only one of the lubricant sealing devices 2 on one side will be typically described below.
[0017] The lubricant sealing device 2 is provided to hold the lubricant supplied to the bearing device 3 within a space (filling space 4) formed between the lubricant sealing device 2 itself and the bearing device 3. The lubricant sealing device 2 has a rotating side sealing member 21 and a stationary side sealing member 22.
[0018] The rotating side sealing member 21 is fixed to the outer peripheral surface of the rotating shaft 10. The rotating side sealing member 21 has a rotating side base portion 51 and a rotating side annular portion 52. The rotating side base portion 51 is externally fitted to the outer peripheral surface of the rotating shaft 10 by forming an annular shape centered on the axis O. As an example, the cross-sectional shape of the rotating side base portion 51 is rectangular.
[0019] The rotating side annular portion 52 protrudes radially outward from the rotating side base portion 51. The rotating side annular portion 52 is provided at the edge of the rotating side base portion 51 on the side close to the bearing device 3. That is, the end surfaces of the rotating side annular portion 52 and the rotating side base portion 51 on the lubricating space side are flush with each other.
[0020] The rotating side annular portion 52 has a rotating side annular portion main body �3 and a rotating side fin 54. The rotating side annular portion main body 53 forms a thin-walled annular shape with a dimension in the direction of the axis O smaller than that of the rotating side base portion 51. A rotating side fin 54 is provided at an intermediate position in the radial direction of the rotating side annular portion main body 53.
[0021] The rotating side fin 54 protrudes in the direction of the axis O from the rotating annular portion main body. Also, the rotating side fin 54 forms a cylindrical shape centered on the axis O. That is, the rotating side fin 54 extends annularly over the entire circumferential direction with respect to the axis O. It is desirable that the position where the rotating side fin 54 is provided is outside the central portion in the radial direction of the rotating side annular portion main body 53.
[0022] The stationary sealing member 22 is fixed to the inner circumferential surface of the housing 11. The stationary sealing member 22 has a stationary base portion 61 and a stationary annular portion 62. The stationary base portion 61 is fitted into the inner circumferential surface of the housing 11 by forming an annular shape centered on axis O. The cross-sectional shape of the stationary base portion 61 is rectangular as an example.
[0023] The stationary annular portion 62 protrudes radially inward from the stationary base portion 61. The stationary annular portion 62 is provided on the edge of the stationary base portion 61 that is spaced away from the bearing device 3. In other words, the stationary annular portion 62 and the end face of the stationary base portion 61 opposite to the lubrication space are flush with each other.
[0024] The stationary annular portion 62 is a thin-walled annular shape with a smaller dimension in the axial direction O than the stationary base portion 61. The stationary annular portion 62 faces the rotating annular portion 52 at a distance in the axial direction O. Furthermore, the radially inner end of the stationary annular portion 62 and the rotating base portion 51 face each other radially via a gap that widens radially. Similarly, the radially outer end of the rotating annular portion 52 and the stationary base portion 61 face each other radially via a gap that widens radially.
[0025] The gap between the stationary annular portion 62 and the rotating annular portion 52 forms a closed space 7. The closed space 7 communicates with the filling space 4 through the gap between the rotating annular portion 52 and the stationary base portion 61. The closed space 7 also communicates with the outside of the filling space 4 through the gap between the stationary annular portion 62 and the rotating base portion 51. As a result, the rotating seal member 21 and the stationary seal member 22 form a labyrinth seal structure that prevents leakage of lubricant between the filling space 4 and its outside.
[0026] Furthermore, the housing 11 is formed with a supply hole 12 for supplying lubricant to the filling space 4 and a discharge hole 13 for discharging it. The lubricant is filled into the filling space 4 through the supply hole 12 while pressure is applied to the lubricant. Simultaneously with the filling of the lubricant, the air or old lubricant in the filling space 4 is discharged to the outside through the discharge hole 13. Note that the lubricant referred to here mainly refers to highly viscous oils such as grease.
[0027] (Effects and Benefits) Next, the operation of the lubricant sealing device 2 will be explained. As described above, when the lubricant is filled into the filling space 4, the lubricant spreads to all parts of the filling space 4, mainly around the sliding part of the bearing device 3. If the supply of lubricant continues, the pressure applied to the lubricant itself will cause the air in the filling space 4, or the old lubricant, to be discharged to the outside through the discharge hole 13.
[0028] In this case, if the lubricant pressure is high, the lubricant may inadvertently leak to the outside through the closed space 7 of the lubricant seal device 2. In other words, the lubricant that should be discharged from the discharge hole 13 may leak to the outside from the lubricant seal device 2 side instead of the discharge hole 13. In this case, the predetermined amount of lubricant may not be supplied into the filling space 4, and the smooth operation of the bearing device 3 may be hindered. Therefore, the lubricant seal device 2 according to this embodiment adopts the above-described configuration.
[0029] According to the above configuration, when lubricant is filled into the space between the bearing device 3 and the lubricant seal device 2, the pressure of the lubricant causes the rotating annular portion 52 to bend (deform) so that it comes into contact with the stationary annular portion 62 (see Figure 2). As a result, the closed space 7 between the rotating annular portion 52 and the stationary annular portion 62 is closed, reducing the possibility of lubricating oil leaking to the outside.
[0030] In particular, with the above configuration, the tip of the rotating fin 54 protrudes toward the stationary annular portion 62. Therefore, even under lower pressure, the rotating annular portion 52 deforms slightly, allowing the rotating fin 54 to immediately contact the stationary annular portion 62 after deformation begins. Consequently, unintentional leakage of lubricant through the closed space 7 can be more effectively suppressed. As a result, a predetermined amount of lubricant can be supplied to the filling space 4 without waste, enabling smooth operation of the bearing device 3. This allows the rotating machine 1 to operate more stably.
[0031] The first embodiment of the present disclosure has been described above. Various changes and modifications can be made to the above configuration without departing from the gist of the present disclosure. For example, as shown in Figure 3 as a first modification, it is possible to provide stationary fins 63 on the stationary annular portion 62 of the stationary seal member 22 instead of the rotating fins 54 of the rotating seal member 21. That is, the stationary annular portion 62 comprises a stationary annular portion body 65 and stationary fins 63. In this case as well, it is desirable that the stationary fins 63 be provided outside the radial center of the stationary annular portion body 65. With this configuration, when the rotating annular portion 52 deforms in the axial direction O due to the pressure when lubricant is supplied, the rotating annular portion 52 and the tip of the stationary fins 63 come into contact. This closes the closed space 7, thereby suppressing lubricant leakage.
[0032] Furthermore, as a second modification, as shown in Figure 4, it is also possible to adopt a configuration in which the rotating-side fin 54 is provided at the radially outer end of the rotating-side annular body 53. In this configuration as well, the closed space 7 is closed, similar to the above configurations, thereby suppressing lubricant leakage. In addition, as shown in Figure 5, when the rotating shaft 10 is rotating, the rotating-side fin 54 deforms by tilting radially outward due to centrifugal force. This reduces the gap between the rotating-side fin 54 and the stationary-side sealing member 22, thereby suppressing lubricant leakage during the rotation of the rotating shaft 10. It is desirable that the magnitude of the centrifugal force, the material of the rotating-side sealing member 21, and the dimensions be appropriately determined so that the rotating-side fin 54 and the stationary-side sealing member 22 do not come into contact during the rotation of the rotating shaft 10.
[0033] Furthermore, as shown in Figure 6, a third modification is possible, where the tip surface 55 of the rotating fin 54 extends in a direction inclined with respect to the axis O. Specifically, it is desirable to give the tip surface 55 an inclination angle equivalent to the tilt angle θ of the rotating annular body 53 due to the pressure when filling with lubricant. (Note that "tilt angle θ" here refers to the average or maximum value of the tilt angle in the extending direction of the rotating annular body 53.) As a result, when the rotating annular body 52 deforms in the direction of axis O, the tip surface 55 of the rotating fin 54 will conform to the surface of the stationary annular body 62. In other words, the tip surface 55 of the rotating fin 54 and the stationary annular body 62 will be in surface contact. Therefore, compared to the case where the rotating fin 54 and the stationary annular body 62 are in line contact, the liquid tightness between the rotating fin 54 and the stationary annular body 62 is improved, and it becomes possible to suppress lubricant leakage even more effectively.
[0034] Furthermore, as a fourth modification shown in Figure 7, a receiving groove 64 may be formed on the surface of the stationary annular portion 62 to accommodate the tip of the rotating fin 54. In other words, this receiving groove 64 is formed at the location where the tip of the rotating fin 54 is located when the rotating annular portion 52 deforms in the direction of axis O. The tip of the rotating fin 54 has an arc shape in a cross-sectional view including axis O. The receiving groove 64 also has a cross-sectional shape that follows this arc. With this configuration, when the rotating annular portion 52 deforms in the direction of axis O, the tip of the rotating fin 54 is accommodated in the receiving groove 64. As a result, the gap between the rotating fin 54 and the stationary annular portion 62 becomes smaller. Also, compared to the case where the rotating fin 54 and the stationary annular portion 62 are in line contact or surface contact, the length of the flow path in the gap becomes longer because the gap is curved. Therefore, the flow resistance of the lubricant in this gap becomes larger, making it possible to suppress lubricant leakage more effectively.
[0035] <Second Embodiment> Next, a second embodiment of the present disclosure will be described with reference to Figure 8. Note that components similar to those in the first embodiment and each of the modified examples described above are denoted by the same reference numerals, and detailed descriptions are omitted. As shown in Figure 8, in this embodiment, the stationary side sealing member 22 has a stationary side base 61, a stationary side first opposing surface 71, and a stationary side second opposing surface 72. The rotating side sealing member 21 has a rotating side base 51, a rotating side first opposing surface 81, and a rotating side second opposing surface 82.
[0036] The stationary first opposing surface 71 faces the rotating annular portion 52 from the direction of axis O. The stationary second opposing surface 72 faces the rotating annular portion 52 from the radial direction. As a result, the stationary first opposing surface 71 and the stationary second opposing surface 72 form a stepped difference. Similarly, the rotating first opposing surface 81 faces the stationary annular portion 62 from the direction of axis O. The rotating second opposing surface 82 faces the stationary annular portion 62 from the radial direction.
[0037] (Effects and Benefits) According to the above configuration, when lubricant is filled into the space between the bearing device 3 and the lubricant seal device 2, the rotating annular portion 52 deforms in the direction of axis O due to the pressure of the lubricant, and the rotating annular portion 52 comes into contact with the stationary first opposing surface 71. As a result, the closed space 7 is closed, and lubricant leakage becomes possible. Furthermore, when the rotating shaft 10 is rotating, the rotating annular portion 52 extends radially outward due to centrifugal force, so the gap between the rotating annular portion 52 and the second opposing surface becomes smaller. As a result, lubricant leakage during the rotation of the rotating shaft 10 can also be suppressed.
[0038] In addition, compared to the case where a rotating fin 54 or a stationary fin 63 is provided, as in the first embodiment described above, the shape is simpler, which makes it possible to reduce the cost required for processing and shorten the lead time. This makes it possible to further reduce the manufacturing cost and maintenance cost of the device.
[0039] <Modifications common to all embodiments> The embodiments of this disclosure have been described above. It is possible to make various changes and modifications to the above configurations without departing from the gist of this disclosure. As a common modification to all embodiments, as shown in Figure 9, the positional relationship between the rotating seal member 21 and the stationary seal member 22 can be reversed compared to each embodiment. In this case as well, the configurations of the above-described modifications can be applied. Furthermore, it is possible to achieve the same effects and advantages as described above.
[0040] <Note> The lubricant sealing device 2 described in each embodiment can be understood, for example, as follows.
[0041] (1) The lubricant sealing device 2 according to the first embodiment is a lubricant sealing device 2 for holding lubricant supplied to a bearing device 3 provided between a rotating shaft 10 rotatable about an axis O and a stationary member surrounding the rotating shaft 10 from the outer circumference in the space between the bearing device 3 and the rotating shaft 10, comprising: a rotating side sealing member 21 provided on the outer circumferential surface of the rotating shaft 10 and having a rotating side annular portion 52 that forms an annular shape with respect to the axis O and protrudes outward; and a stationary side sealing member 22 provided on the stationary member and having a stationary side annular portion 62 that faces the rotating side annular portion 52 without contact, thereby forming a closed space 7 between the stationary side annular portion 52 and the rotating side annular portion 52, wherein either the rotating side annular portion 52 or the stationary side annular portion 62 is deformable so as to abut the other toward the axis O direction by the pressure when the lubricant is filled into the space.
[0042] According to the above configuration, when lubricant is filled into the space between the bearing device 3 and the lubricant seal device 2, the pressure of the lubricant causes either the rotating annular portion 52 or the stationary annular portion 62 to deform so that it comes into contact with the other. As a result, the closed space 7 between the rotating annular portion 52 and the stationary annular portion 62 is closed, reducing the possibility of lubricating oil leaking to the outside.
[0043] (2) The lubricant sealing device 2 according to the second embodiment is the lubricant sealing device 2 of (1), wherein the rotating annular portion 52 comprises an annular rotating annular portion body 53 centered on the axis O, and a rotating fin 54 that protrudes from the rotating annular portion body 53 toward the stationary annular portion 62 and forms an annular shape with respect to the axis O.
[0044] With the above configuration, the tip of the rotating fin 54 protrudes toward the stationary annular portion 62, which allows the rotating annular portion 52 to be deformed and the rotating fin 54 to come into contact with the stationary annular portion 62 even under lower pressure. Therefore, unintentional leakage of lubricant can be suppressed more effectively.
[0045] (3) The lubricant sealing device 2 according to the third embodiment is the lubricant sealing device 2 of (2), wherein the rotating side fin 54 is provided at the radial tip of the rotating side annular body 53.
[0046] With the above configuration, since the rotating fin 54 is provided at the tip of the rotating annular body 53, when lubricant is filled, the rotating fin 54 comes into contact with the stationary annular body 62, thereby suppressing leakage of the lubricant. In addition, when the rotating shaft 10 is rotating, the rotating fin 54 deforms by tilting radially outward due to centrifugal force. As a result, the gap between the rotating fin 54 and the stationary sealing member 22 becomes smaller, and leakage of lubricant during the rotation of the rotating shaft 10 is also suppressed.
[0047] (4) The lubricant sealing device 2 according to the fourth embodiment is the lubricant sealing device 2 of (2) or (3), wherein the tip surface 55 of the rotating fin 54 is inclined with respect to the axis O such that when the rotating annular portion 52 is deformed in the direction of the axis O, it follows the surface of the stationary annular portion 62.
[0048] According to the above configuration, the tip surface 55 of the rotating fin 54 is inclined with respect to the axis O. As a result, when the rotating annular portion 52 deforms in the direction of axis O, the tip portion comes into contact with the surface of the stationary annular portion 62. Therefore, the liquid tightness between the rotating fin 54 and the stationary annular portion 62 is improved, and lubricant leakage can be suppressed even more effectively.
[0049] (5) The lubricant seal device 2 according to the fifth embodiment is the lubricant seal device 2 of (2) or (3), wherein the stationary annular portion 62 has a receiving groove 64 formed therein in which the tip of the rotating fin 54 is accommodated when the rotating annular portion 52 is deformed in the direction of the axis O.
[0050] According to the above configuration, when the rotating annular portion 52 deforms in the direction of axis O, the tip of the rotating fin 54 is accommodated in the receiving groove 64. As a result, the gap between the rotating fin 54 and the stationary annular portion 62 becomes smaller, and the length of the flow path in the gap becomes longer. Therefore, the flow resistance of the lubricant in the gap increases, making it possible to suppress lubricant leakage more effectively.
[0051] (6) The lubricant seal device 2 according to the second embodiment is a lubricant seal device 2 according to any one embodiment of (1) to (5), wherein the stationary annular portion 62 has an annular stationary annular portion 62 body centered on the axis O, and a stationary fin 63 that protrudes from the stationary annular portion 62 body toward the rotating annular portion 52 and forms an annular shape centered on the axis O.
[0052] With the above configuration, the tip of the stationary fin 63 protrudes toward the rotating annular portion 52, which allows the stationary annular portion 62 to be deformed and the stationary fin 63 to come into contact with the rotating annular portion 52 even under lower pressure. Therefore, unintentional leakage of lubricant can be suppressed more effectively.
[0053] (7) The lubricant sealing device 2 according to the seventh embodiment is the lubricant sealing device 2 of (6), wherein the tip surface 55 of the stationary fin 63 is inclined with respect to the axis O such that when the stationary annular portion 62 deforms in the direction of the axis O, it follows the surface of the rotating annular portion 52.
[0054] According to the above configuration, the tip surface 55 of the stationary fin 63 is inclined with respect to the axis O. As a result, when the stationary annular portion 62 deforms in the direction of axis O, its tip comes into contact with the surface of the rotating annular portion 52. Therefore, the liquid tightness between the stationary fin 63 and the rotating annular portion 52 is improved, and lubricant leakage can be suppressed even more effectively.
[0055] (8) The lubricant seal device 2 according to the eighth embodiment is the lubricant seal device 2 of (6), wherein the rotating annular portion 52 has a receiving groove 64 formed therein in which the tip of the stationary fin 63 is accommodated when the stationary annular portion 62 is deformed in the direction of the axis O.
[0056] According to the above configuration, when the stationary annular portion 62 deforms in the direction of axis O, the tip of the stationary fin 63 is accommodated in the receiving groove 64. As a result, the gap between the stationary fin 63 and the rotating annular portion 52 becomes smaller, and the length of the flow path in the gap becomes longer. Therefore, the flow resistance of the lubricant in the gap increases, making it possible to suppress lubricant leakage more effectively.
[0057] (9) The lubricant sealing device 2 according to the ninth embodiment is the lubricant sealing device 2 of (1), wherein the stationary sealing member 22 has a stationary first opposing surface 71 that faces the rotating annular portion 52 from the direction of the axis O, and a stationary second opposing surface 72 that faces it from the radial direction.
[0058] According to the above configuration, when lubricant is filled into the space between the bearing device 3 and the lubricant seal device 2, the rotating annular portion 52 deforms in the direction of axis O due to the pressure of the lubricant, and the rotating annular portion 52 comes into contact with the stationary first opposing surface 71. As a result, the closed space 7 is closed, and lubricant leakage becomes possible. Furthermore, when the rotating shaft 10 is rotating, the rotating annular portion 52 extends radially outward due to centrifugal force, so the gap between the rotating annular portion 52 and the second opposing surface becomes smaller. As a result, lubricant leakage during the rotation of the rotating shaft 10 can also be suppressed.
[0059] (10) The lubricant sealing device 2 according to the tenth embodiment is the lubricant sealing device 2 of (1), wherein the rotating side sealing member 21 has a rotating side first opposing surface 81 that faces the stationary side annular portion 62 from the direction of axis O, and a rotating side second opposing surface 82 that faces it from the radial direction.
[0060] According to the above configuration, when lubricant is filled into the space between the bearing device 3 and the lubricant seal device 2, the stationary annular portion 62 deforms in the direction of axis O due to the pressure of the lubricant, and the stationary annular portion 62 comes into contact with the rotating first opposing surface 81. As a result, the closed space 7 is closed, and lubricant leakage becomes possible. Furthermore, since the rotating second opposing surface 82 is provided, the gap between the stationary annular portion 62 and the rotating second opposing surface 82 can be kept small. As a result, lubricant leakage during the rotation of the rotating shaft 10 can also be suppressed.
[0061] (11) The rotating machine 1 according to the eleventh embodiment comprises the rotating shaft 10, the stationary side member, the bearing device 3 provided between the rotating shaft 10 and the stationary side member, and the lubricant seal device 2 according to any one embodiment of (1) to (10).
[0062] With the above configuration, lubricant leakage is suppressed, allowing the bearing device 3 to operate smoothly. This makes it possible to achieve more stable operation of the rotating machine 1. [Explanation of symbols]
[0063] 1…Rotating machinery 2… Lubricant sealing device 3. Bearing device 4…Filling space 7…Closed space 10…Rotation axis 11… Housing 12…Supply hole 13...Discharge hole 21... Rotating side sealing member 22...Stationary side sealing member 31…Inner circle 32... 33…Outer ring 51... Rotating base 52... Rotating annular section 53... Rotating annular body 54…Rotating fins 55…Tip surface 61...Stationary side base 62... Stationary annular section 63... Stationary fin 64… Storage groove 65...Main body of the stationary annular section 71...First opposing surface on the stationary side 72…Second opposing surface on stationary side 81...First opposing surface on the rotating side 82... Rotating side second opposing surface O…Axis line
Claims
1. A lubricant seal device for retaining lubricant supplied to a bearing device provided between a rotating shaft that can rotate around its axis and a stationary member surrounding the rotating shaft from the outer circumference, in the space between the bearing device and the bearing device, A rotating side sealing member provided on the outer circumferential surface of the rotating shaft, having a rotating side annular portion that forms an annular shape with respect to the axis and protrudes outward, A stationary side sealing member having a stationary side annular portion provided on the stationary side member and facing the rotating side annular portion without contact, thereby forming a closed space between itself and the rotating side annular portion, Equipped with, A lubricant sealing device in which either the rotating annular portion or the stationary annular portion is deformable so as to abut the other portion from the axial direction due to the pressure when the lubricant is filled into the space.
2. The rotating annular portion comprises an annular rotating annular portion body centered on the axis, A rotating fin protrudes from the rotating annular body toward the stationary annular portion and forms an annular shape with respect to the axis, A lubricant sealing device according to claim 1, having the following features.
3. The rotating annular portion is deformable so as to abut toward the stationary annular portion from the axial direction by the pressure when the lubricant is filled into the space, The lubricant sealing device according to claim 2, wherein the rotating fin is provided at the tip of the rotating annular body in the radial direction.
4. The lubricant sealing device according to claim 2 or 3, wherein the tip surface of the rotating fin is inclined with respect to the axis so as to conform to the surface of the stationary annular portion when the rotating annular portion is deformed in the axial direction.
5. The lubricant sealing device according to claim 2 or 3, wherein the stationary annular portion is formed with a receiving groove that accommodates the tip of the rotating fin when the rotating annular portion deforms in the axial direction.
6. The stationary annular portion comprises a stationary annular portion body that is an annular shape centered on the axis, A stationary fin protrudes from the stationary annular body toward the rotating annular portion and forms an annular shape with respect to the axis, A lubricant sealing device according to claim 1, having the following features.
7. The lubricant sealing device according to claim 6, wherein the tip surface of the stationary fin is inclined with respect to the axis so as to conform to the surface of the rotating annular portion when the stationary annular portion deforms in the axial direction.
8. The lubricant sealing device according to claim 6, wherein the rotating annular portion is formed with a receiving groove that accommodates the tip of the stationary fin when the stationary annular portion deforms in the axial direction.
9. The rotating annular portion is deformable so as to abut toward the stationary annular portion from the axial direction by the pressure when the lubricant is filled into the space, The lubricant sealing device according to claim 1, wherein the stationary sealing member has a stationary first opposing surface that faces the rotating annular portion from the axial direction and a stationary second opposing surface that faces it from the radial direction.
10. The stationary annular portion is deformable so as to abut toward the rotating annular portion from the axial direction by the pressure when the lubricant is filled into the space, The lubricant sealing device according to claim 1, wherein the rotating side sealing member has a first rotating side opposing surface that faces the stationary side annular portion from the axial direction and a second rotating side opposing surface that faces the stationary side annular portion from the radial direction.
11. The aforementioned rotating shaft, The stationary side member and, The bearing device provided between the rotating shaft and the stationary side member, The lubricant sealing device according to claim 1, A rotating machine equipped with the following features.