Oil shield sealing structure for steam turbine

Abstract

The invention relates to the technical field of oil retainers, in particular to an oil retainer sealing structure for a steam turbine, which comprises a bearing box and a rotating shaft, an oil retainer assembly is arranged on the outer side of the bearing box, the oil retainer assembly comprises an outer oil retainer and an inner oil retainer, a wedge-shaped convex block is fixedly mounted on the side surface of the inner oil retainer, and the section of the wedge-shaped convex block is triangular; a first groove and a second groove are formed in the positions, close to each other, of the outer oil shield and the inner oil shield respectively, and the sections of the first groove and the second groove are both S-shaped. The beneficial effects are that the outer side of the bearing is provided with the outer oil shield and the inner oil shield, the outer oil shield is attached to the bearing box and is relatively fixed with the bearing box, the inner oil shield is sleeved on the outer side of the rotating shaft and synchronously rotates along with the rotating shaft, the mutually attached positions of the outer oil shield and the inner oil shield are respectively provided with the first groove and the second groove, and the cross sections of the first groove and the second groove are both S-shaped; the compressed gas flows along the gap between the groove I and the groove II to form an annular vortex and enters the bearing, so that the leakage of the lubricating oil can be further prevented.

Description

Technical Field

[0001] The invention relates to the technical field of oil baffles, in particular to an oil baffle sealing structure for a steam turbine. Background Art

[0002] The function of the turbine oil baffle is to prevent the turbine bearing lubricating oil from flowing along the journal to the outside of the bearing.

[0003] At present, a Chinese utility model with publication number CN203939995U discloses a self-positioning airtight oil baffle, which installs an airtight device in the middle part of the oil baffle to uniformly introduce compressed air into the middle of the oil baffle to prevent oil leakage from the main engine bearing box.

[0004] However, since there must be relative rotation between the bearing box and the rotating shaft, with the high-speed rotation of the rotating shaft and the long-term use of the steam turbine, the contact part between the oil baffle and the rotating shaft will gradually wear, and the bearing lubricating oil is very likely to leak along the gap between the bearing surface and the oil baffle. In addition, when the rotating shaft rotates at high speed, the lubricating oil is squeezed by the rolling elements inside the bearing, making it difficult for general seals to prevent the lubricating oil from leaking. To this end, the present invention proposes an oil baffle sealing structure for a steam turbine to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an oil baffle sealing structure for a steam turbine to solve the problem mentioned in the background technology that when the shaft rotates at high speed, the rolling elements inside the bearing exert a large squeezing force on the lubricating oil, and general seals are difficult to prevent the lubricating oil from leaking.

[0006] To achieve the above object, the present invention provides the following technical solution: an oil baffle sealing structure for a steam turbine, comprising: A bearing box and a rotating shaft, wherein an oil baffle assembly is arranged on the outer side of the bearing box, and the oil baffle assembly comprises an outer oil baffle and an inner oil baffle, and the two are concentric, the inner oil baffle is sleeved on the outer side of the rotating shaft and driven to rotate by the rotating shaft, the inner oil baffle and the rotating shaft are kept sealed, and a wedge-shaped protrusion is fixedly installed on the side of the inner oil baffle, and the cross section of the wedge-shaped protrusion is triangular; The outer oil baffle and the inner oil baffle are located in the same plane, the outer oil baffle is in contact with the surface of the bearing box and maintains a seal therewith, the outer oil baffle and the inner oil baffle are respectively provided with groove one and groove two near each other, and both have "S"-shaped cross-sections, an annular air passage is provided inside the outer oil baffle, and an exhaust hole is provided on the inner wall of the annular air passage and is connected to groove one.

[0007] Preferably, a bearing assembly is arranged between the bearing box and the rotating shaft, and the bearing assembly includes a bearing outer ring, a bearing inner ring and rolling elements, the side surfaces of the outer oil stopper and the inner oil stopper are respectively fitted with the side surfaces of the bearing outer ring and the bearing inner ring, and the wedge-shaped protrusion is opposite to the gap between the bearing outer ring and the bearing inner ring.

[0008] Preferably, the exhaust hole is along the radial direction of the outer oil baffle, and the open end of the exhaust hole corresponds to the middle of the groove one, and the exhaust holes are provided in plurality and distributed in a circular array around the outer oil baffle, and the outer side wall of the outer oil baffle is provided with a connecting port connected to the annular airway, and the connecting port is connected to the external compressor through an air pipe.

[0009] Preferably, the inner edge of the outer oil baffle is folded toward the outer ring of the bearing to form an annular flange 1, and the side surface of the outer oil baffle and the surface of the annular flange 1 are both provided with a sealing ring 1, and the sealing ring 1 is sealed and fitted with the surface of the outer ring of the bearing.

[0010] Preferably, an annular flange 2 is fixedly provided on the side of the inner oil baffle, and the inner wall of the annular flange 2 and the inner wall of the inner oil baffle are both provided with a sealing ring 2, and the two sealing rings 2 respectively seal against the bearing inner ring surface and the rotating shaft surface.

[0011] Preferably, a clamping ring is provided on the outer side of the inner oil baffle, a spring pressure groove is provided on the surface of the inner oil baffle close to the pressure ring, and a compression spring is provided in the inner cavity of the spring pressure groove, the compression spring is in a compressed state, and its two ends respectively press against the bottom of the spring pressure groove and the surface of the clamping ring.

[0012] Preferably, a plurality of plug-in grooves distributed in a circular array are opened on the surface of the inner oil baffle close to the clamping ring, and plug-in blocks corresponding to the plurality of plug-in grooves are fixed on the surface of the clamping ring. The clamping ring fits the inner oil baffle, and the plug-in blocks are movably plugged into the inner cavity of the plug-in groove.

[0013] Preferably, an annular positioning groove is provided on the surface of the rotating shaft, and a positioning clamping spring is provided in the inner cavity of the annular positioning groove. The positioning clamping spring is located on one side of the clamping ring and presses the clamping ring.

[0014] Preferably, a sliding groove is provided on the surface of the rotating shaft, and the sliding groove is along the length direction of the rotating shaft. A limiting slider is fixedly provided on the inner side wall of the clamping ring, and the limiting slider is located in the inner cavity of the sliding groove and is slidably connected thereto.

[0015] Preferably, the sliding grooves and the limiting sliding blocks are provided in plurality and correspond one to one, and the sliding grooves and the limiting sliding blocks are distributed in a ring array around the axis of the rotating shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an outer oil stopper and an inner oil stopper on the outer side of the bearing. The outer oil stopper is attached to the bearing box and kept relatively fixed. The inner oil stopper is sleeved on the outer side of the rotating shaft and rotates synchronously with the rotating shaft. A wedge-shaped protrusion is provided on the side of the inner oil stopper. The rotating shaft drives the inner oil stopper and the wedge-shaped protrusion to rotate. The wedge-shaped protrusion can squeeze the lubricating oil inside the bearing to offset the squeezing force of the rolling body on the lubricating oil. A groove 1 and a groove 2 are respectively provided at the place where the outer oil stopper and the inner oil stopper are attached to each other, and the cross-sections of the two are both "S"-shaped. An annular airway is provided inside the outer oil stopper and is connected with the groove 1 through the exhaust hole. The compressed gas flows along the gap between the groove 1 and the groove 2 to form an annular vortex and enters the interior of the bearing, thereby further preventing the leakage of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 It is a three-dimensional schematic diagram of the rotating shaft structure of the present invention; Figure 3 It is a three-dimensional schematic diagram of the clamping ring structure of the present invention; Figure 4 It is a partially cutaway schematic diagram of the outer oil retainer structure of the present invention; Figure 5 It is a partially cutaway schematic diagram of the inner oil baffle structure of the present invention; Figure 6 It is a three-dimensional schematic diagram of the inner oil baffle structure of the present invention from another perspective; Figure 7 For the present invention Figure 4 A schematic diagram of the enlarged structure in the middle.

[0018] In the figure: 1. bearing box; 2. rotating shaft; 21. annular positioning groove; 22. positioning retaining spring; 23. sliding groove; 3. bearing outer ring; 4. bearing inner ring; 5. outer oil stopper; 51. groove one; 52. annular airway; 53. exhaust hole; 54. annular flange one; 55. sealing ring one; 56. connecting port; 6. inner oil stopper; 61. groove two; 62. annular flange two; 63. wedge-shaped protrusion; 64. sealing ring two; 65. spring pressure groove; 66. plug-in groove; 7. clamping ring; 71. limit slider; 72. plug-in block; 8. clamping spring. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.

[0023] See also Figures 1 to 7 , the present invention provides a technical solution: Embodiment 1, an oil baffle sealing structure for a steam turbine, includes: a bearing box 1 and a rotating shaft 2.

[0024] Specifically, an oil baffle assembly is provided on the outer side of the bearing box 1, and the oil baffle assembly includes an outer oil baffle 5 and an inner oil baffle 6, and the two are concentric, the outer oil baffle 5 is in contact with the surface of the bearing box 1 and keeps a seal therewith, and the inner oil baffle 6 is sleeved on the outer side of the rotating shaft 2 and driven to rotate by the rotating shaft 2, as shown in FIG. Figure 1 As shown, the outer oil stopper 5 is relatively fixed to the bearing box 1, while the inner oil stopper 6 can rotate synchronously with the rotation of the rotating shaft 2. The inner oil stopper 6 and the rotating shaft 2 are sealed, so the lubricating grease between the bearing box 1 and the rotating shaft 2 may only leak from the gap between the outer oil stopper 5 and the inner oil stopper 6. A wedge-shaped protrusion 63 is fixedly installed on the side of the inner oil stopper 6, and the cross-section of the wedge-shaped protrusion 63 is triangular. The wedge-shaped protrusion 63 is located in the gap between the bearing box 1 and the rotating shaft 2. When the inner oil stopper 6 rotates, the wedge-shaped protrusion 63 rotates synchronously therewith. The inclined side of the wedge-shaped protrusion 63 itself will generate a horizontal thrust (i.e., along the length direction of the rotating shaft 2) on the lubricating grease between the bearing box 1 and the rotating shaft 2 during the rotation of the wedge-shaped protrusion 63, so that the lubricating grease always has a tendency to stay away from the outer oil stopper 5 and the inner oil stopper 6, thereby reducing the possibility of leakage of the lubricating grease itself, and as the rotation speed of the rotating shaft 2 increases, the horizontal thrust generated by the wedge-shaped protrusion 63 on the lubricating grease is also greater, so the device can adapt to the rotation speed of the rotating shaft 2; Secondly, the outer oil stopper 5 and the inner oil stopper 6 are located in the same plane, and the outer oil stopper 5 and the inner oil stopper 6 are respectively provided with a groove 1 51 and a groove 2 61 near each other, and the cross-sections of both are "S" shaped, combined with Figure 4 , Figure 5 and Figure 1 As shown, the arrangement of groove one 51 and groove two 61 can be used to extend the flow path when the lubricating grease leaks, and an annular airway 52 is opened inside the outer oil baffle 5, and an exhaust hole 53 is opened on the inner wall of the annular airway 52 and connected to the groove one 51. The compressed gas in the inner cavity of the annular airway 52 can fill the gap between the groove one 51 and the groove two 61, thereby preventing the lubricating grease from leaking. In addition, since the groove one 51 and the groove two 61 are both "S"-shaped, the flow direction of the gas discharged from the exhaust hole 53 can be guided, so that the gas always has a tendency to flow into the bearing box 1, further avoiding the possibility of leakage of the lubricating grease due to the flow of air.

[0025] In order to reduce the friction resistance when the rotating shaft 2 rotates, the present application also has a bearing assembly arranged between the bearing box 1 and the rotating shaft 2, and the bearing assembly includes a bearing outer ring 3, a bearing inner ring 4 and a rolling element, such as Figure 1As shown, the bearing assembly can avoid direct contact between the bearing box 1 and the rotating shaft 2, reduce the friction resistance encountered by the bearing box 1 when rotating, the side surfaces of the outer oil baffle 5 and the inner oil baffle 6 are respectively fitted with the side surfaces of the bearing outer ring 3 and the bearing inner ring 4, the wedge-shaped protrusion 63 is directly opposite to the gap between the bearing outer ring 3 and the bearing inner ring 4, the bearing outer ring 3 and the bearing box 1 have an interference fit, and the bearing inner ring 4 and the rotating shaft 2 have an interference fit, so the lubricating grease can only leak out through the internal space of the bearing assembly, and the cooperation of the outer oil baffle 5 and the inner oil baffle 6 can have a good sealing effect on the side surface of the bearing assembly, thereby preventing the possibility of leakage of the lubricating grease.

[0026] In order to utilize the flow of gas to prevent the leakage of lubricating grease, the exhaust hole 53 of the present application is along the radial direction of the outer oil baffle 5, and the opening end of the exhaust hole 53 corresponds to the middle of the groove 1 51, such as Figure 4 and Figure 7 As shown, the gas in the inner cavity of the annular airway 52 can be discharged along the exhaust hole 53. Since the angle between the exhaust hole 53 and the left side of the groove 51 is an obtuse angle, and the angle between the exhaust hole 53 and the right side of the groove 51 is an acute angle, when the exhaust hole 53 discharges gas, more gas will flow to the left area of ​​the groove 51, that is, the gas will flow toward the inside of the bearing box 1. The gas flow direction is exactly opposite to the leakage direction of the lubricating grease, so the leakage of the lubricating grease can be effectively prevented. There are multiple exhaust holes 53 and they are distributed in a circular array around the outer oil baffle 5 to ensure that all positions of the gap between the groove 1 51 and the groove 2 61 can be filled with gas. A connecting port 56 connected to the annular airway 52 is provided on the outer wall of the outer oil baffle 5. The connecting port 56 is connected to the external compressor through an air pipe, and the external compressed gas can always fill the inner cavity of the annular airway 52 with compressed gas.

[0027] In order to improve the sealing between the bearing outer ring 3 and the outer oil baffle 5, the inner edge of the outer oil baffle 5 of the present application is folded toward the bearing outer ring 3 to form an annular flange 54, and the side surface of the outer oil baffle 5 and the surface of the annular flange 54 are both provided with a sealing ring 55, and the sealing ring 55 is sealed and fitted with the surface of the bearing outer ring 3. Figure 7 and Figure 1 As shown, the setting of the annular flange 54 can increase the contact area between the outer oil baffle 5 and the bearing outer ring 3, thereby improving the sealing between the two, and increasing the friction between the two, to prevent the outer oil baffle 5 from being affected by the inner oil baffle 6 and rotating. In addition, the outer oil baffle 5 of the device can also be fixedly connected to the bearing box 1 by bolts, and maintain a close fit with the bearing outer ring 3 by means of the tightening force of the bolts.

[0028] In order to improve the sealing between the bearing inner ring 4 and the inner oil baffle 6, the present application also has an annular flange 2 62 fixedly arranged on the side of the inner oil baffle 6, and the inner wall of the annular flange 2 62 and the inner wall of the inner oil baffle 6 are both provided with a sealing ring 2 64, and the two sealing rings 2 64 are respectively sealed and fitted with the surface of the bearing inner ring 4 and the surface of the rotating shaft 2, and the setting of the annular flange 2 62 is used to increase the contact area between the inner oil baffle 6 and the bearing inner ring 4, thereby improving the sealing between the two. In addition, the annular flange 1 54 and the annular flange 2 62 are respectively fitted with the inner walls of the bearing outer ring 3 and the bearing inner ring 4, ensuring that the lubricating grease will inevitably contact the wedge-shaped protrusion 63 during the leakage process, and the wedge-shaped protrusion 63 can prevent the lubricating grease from leaking when rotating.

[0029] In order to position the inner oil baffle 6, the present application further has a clamping ring 7 arranged on the outer side of the inner oil baffle 6, a spring pressure groove 65 is opened on the surface of the inner oil baffle 6 close to the clamping ring 7, and a clamping spring 8 is arranged in the inner cavity of the spring pressure groove 65, the clamping spring 8 is in a compressed state, and the two ends are respectively against the bottom of the spring pressure groove 65 and the surface of the clamping ring 7, such as Figure 5 and Figure 1 As shown, the setting of the clamping ring 7 can be used to limit the inner oil stopper 6 to prevent the inner oil stopper 6 from sliding along the length direction of the rotating shaft 2 and causing separation from the bearing inner ring 4. The setting of the clamping spring 8 can clamp the inner oil stopper 6 to ensure that the inner oil stopper 6 and the bearing inner ring 4 can maintain a close fit, thereby ensuring sealing.

[0030] In order to ensure the relative fixation between the inner oil baffle 6 and the clamping ring 7, the present application also has a plurality of plug-in grooves 66 distributed in a ring array on the surface of the inner oil baffle 6 close to the clamping ring 7, and a plug-in block 72 corresponding to the plurality of plug-in grooves 66 is fixed on the surface of the clamping ring 7. The clamping ring 7 fits the inner oil baffle 6, and the plug-in block 72 is movably plugged into the inner cavity of the plug-in groove 66. Figure 6 and Figure 3 As shown, after the clamping ring 7 clamps the inner oil baffle 6, the plug-in block 72 can be plugged into the inner cavity of the plug-in groove 66. At this time, the inner oil baffle 6 and the clamping ring 7 remain relatively fixed, and the clamping ring 7 can drive the inner oil baffle 6 to rotate when rotating.

[0031] In order to position the clamping ring 7, the present application also has an annular positioning groove 21 on the surface of the rotating shaft 2, and a positioning spring 22 is clamped in the inner cavity of the annular positioning groove 21. The positioning spring 22 is located on one side of the clamping ring 7 and clamps the clamping ring 7. The positioning spring 22 is used to position the clamping ring 7, and the positioning spring 22 itself can undergo a certain degree of elastic deformation, so that it can be disassembled and separated from the annular positioning groove 21 or clamped and installed.

[0032] In order to ensure that the rotating shaft 2 can drive the clamping ring 7 to rotate with it, the present application also has a sliding groove 23 opened on the surface of the rotating shaft 2, the sliding groove 23 is along the length direction of the rotating shaft 2, and the inner side wall of the clamping ring 7 is fixedly provided with a limit slider 71, which is located in the inner cavity of the sliding groove 23 and is slidably connected thereto, such as Figure 2 and Figure 3 As shown, the clamping ring 7 and the rotating shaft 2 are kept relatively fixed by the cooperation of the limiting slider 71 and the sliding groove 23. When the rotating shaft 2 rotates, the clamping ring 7 can be driven to rotate accordingly. When the positioning clamp 22 is removed, the clamping ring 7 can slide along the length direction of the rotating shaft 2, thereby realizing the removal of the clamping ring 7. There are multiple sliding grooves 23 and limiting sliders 71 and they correspond one to one. The sliding grooves 23 and the limiting sliders 71 are distributed in a ring array around the axis of the rotating shaft 2, which can improve the connection strength and stability between the clamping ring 7 and the rotating shaft 2.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil baffle sealing structure for a steam turbine, characterized in that: include: A bearing box (1) and a rotating shaft (2), wherein an oil baffle assembly is arranged on the outer side of the bearing box (1), the oil baffle assembly comprising an outer oil baffle (5) and an inner oil baffle (6), and the two are concentric, the inner oil baffle (6) is sleeved on the outer side of the rotating shaft (2) and driven to rotate by the rotating shaft (2), the inner oil baffle (6) and the rotating shaft (2) are sealed, and a wedge-shaped protrusion (63) is fixedly mounted on the side of the inner oil baffle (6), and the cross section of the wedge-shaped protrusion (63) is triangular; The outer oil baffle (5) and the inner oil baffle (6) are located in the same plane. The outer oil baffle (5) is in contact with the surface of the bearing box (1) and maintains a seal therewith. The outer oil baffle (5) and the inner oil baffle (6) are respectively provided with a groove 1 (51) and a groove 2 (61) near each other, and both have "S"-shaped cross-sections. An annular air passage (52) is provided inside the outer oil baffle (5). An exhaust hole (53) is provided on the inner wall of the annular air passage (52) and is connected to the groove 1 (51).

2. The oil baffle sealing structure for a steam turbine according to claim 1, characterized in that: A bearing assembly is arranged between the bearing box (1) and the rotating shaft (2), the bearing assembly comprising a bearing outer ring (3), a bearing inner ring (4) and rolling elements, the side surfaces of the outer oil stopper (5) and the inner oil stopper (6) respectively fit the side surfaces of the bearing outer ring (3) and the bearing inner ring (4), and the wedge-shaped protrusion (63) faces the gap between the bearing outer ring (3) and the bearing inner ring (4).

3. The oil baffle sealing structure for a steam turbine according to claim 2, characterized in that: The exhaust hole (53) is arranged along the radial direction of the outer oil baffle (5), and the open end of the exhaust hole (53) corresponds to the middle of the groove 1 (51). A plurality of the exhaust holes (53) are arranged and are distributed in an annular array around the outer oil baffle (5). The outer side wall of the outer oil baffle (5) is provided with a connecting port (56) communicating with the annular air passage (52), and the connecting port (56) is communicated with an external compressor through an air pipe.

4. The oil baffle sealing structure for a steam turbine according to claim 3, characterized in that: The inner edge of the outer oil baffle (5) is folded toward the bearing outer ring (3) to form an annular flange (54), and a sealing ring (55) is provided on the side surface of the outer oil baffle (5) and the surface of the annular flange (54), and the sealing ring (55) is in sealing contact with the surface of the bearing outer ring (3).

5. The oil baffle sealing structure for a steam turbine according to claim 4, characterized in that: A second annular flange (62) is fixedly provided on the side surface of the inner oil baffle (6), and a second sealing ring (64) is provided on the inner side wall of the second annular flange (62) and the inner side wall of the inner oil baffle (6). The two second sealing rings (64) are respectively sealed against the surface of the bearing inner ring (4) and the surface of the rotating shaft (2).

6. The oil baffle sealing structure for a steam turbine according to claim 5, characterized in that: A clamping ring (7) is arranged on the outer side of the inner oil baffle (6), a spring pressure groove (65) is provided on the surface of the inner oil baffle (6) close to the pressure ring (7), and a clamping spring (8) is arranged in the inner cavity of the spring pressure groove (65), the clamping spring (8) is in a compressed state, and two ends of the clamping spring (8) respectively abut against the bottom of the spring pressure groove (65) and the surface of the clamping ring (7).

7. The oil baffle sealing structure for a steam turbine according to claim 6, characterized in that: A plurality of plug-in grooves (66) arranged in a circular array are formed on the surface of the inner oil baffle (6) close to the clamping ring (7); plug-in blocks (72) corresponding to the plurality of plug-in grooves (66) are fixed on the surface of the clamping ring (7); the clamping ring (7) fits the inner oil baffle (6), and the plug-in blocks (72) are movably plugged into the inner cavities of the plug-in grooves (66).

8. The oil baffle sealing structure for a steam turbine according to claim 7, characterized in that: An annular positioning groove (21) is provided on the surface of the rotating shaft (2), and a positioning clamping spring (22) is provided in the inner cavity of the annular positioning groove (21). The positioning clamping spring (22) is located on one side of the clamping ring (7) and clamps the clamping ring (7).

9. The oil baffle sealing structure for a steam turbine according to claim 8, characterized in that: A sliding groove (23) is provided on the surface of the rotating shaft (2), and the sliding groove (23) is along the length direction of the rotating shaft (2). A limiting slider (71) is fixedly provided on the inner side wall of the clamping ring (7), and the limiting slider (71) is located in the inner cavity of the sliding groove (23) and is slidably connected thereto.

10. The oil baffle sealing structure for a steam turbine according to claim 9, characterized in that: The sliding grooves (23) and the limiting sliding blocks (71) are both provided in plurality and correspond one to one, and the sliding grooves (23) and the limiting sliding blocks (71) are both distributed in a ring array around the axis of the rotating shaft (2).

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