Insulation sealing device and generator

Abstract

The utility model relates to the technical field of generators, and provides an insulation sealing device and a generator, the insulation sealing device comprises a transition ring, a sealing tile structure, a first oil deflector ring structure and a second oil deflector ring structure which are arranged between an end cover and a rotating shaft at the excitation end of the generator; the transition ring is an insulating part and is connected to the end cover; the sealing pad structure is connected to the transition ring, an oil film gap is formed between the sealing pad structure and the rotating shaft, and the sealing pad structure is used for supplying hydrogen side sealing oil, vacuum side sealing oil and air side sealing oil to the oil film gap; the first oil retainer structure is connected to the transition ring; and the second oil retainer structure is an insulating part, is connected to the end cover, and is arranged on one side, opposite to the transition ring, of the sealing tile structure. The insulation performance and the sealing performance of the sealing device can be improved, safe operation of generator equipment is guaranteed, and explosion accidents caused by accidental hydrogen leakage and oil leakage of a generator are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of generators, and in particular provides an insulating sealing device and a generator. Background Art

[0002] A steam turbine generator refers to a generator driven by a steam turbine. The superheated steam generated by the boiler enters the steam turbine, expands and performs work, driving the generator to generate electricity.

[0003] During operation, steam turbine generators are typically cooled using a water-hydrogen cooling system. Seals are used at both ends of the generator shaft (the steam end and the excitation end) to prevent hydrogen leakage from the shaft and prevent air from entering the generator. In addition to sealing requirements, the excitation end of the generator is also subject to strict insulation requirements to prevent sparks and arcs, which could pose a serious threat to production safety.

[0004] However, the sealing devices currently used have poor insulation and sealing properties, which endangers the safe production of equipment. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide an insulating sealing device and a generator, aiming to solve the problems of poor insulation and sealing performance of existing sealing devices.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] The present application provides an insulating sealing device, comprising a transition ring, a sealing shoe structure, a first oil deflector ring structure, and a second oil deflector ring structure for being arranged between an end cover and a rotating shaft of an excitation end of a generator, wherein:

[0008] The transition ring is an insulating member and is connected to the end cover;

[0009] The sealing shoe structure is connected to the transition ring, and an oil film gap is defined between the sealing shoe structure and the rotating shaft. The sealing shoe structure is used to supply hydrogen side sealing oil, vacuum side sealing oil, and air side sealing oil to the oil film gap. The vacuum side sealing oil is used to isolate the hydrogen side sealing oil from the air side sealing oil.

[0010] The first oil retaining ring structure is connected to the transition ring, and the first oil retaining ring structure is used to retain the hydrogen side sealing oil and part of the vacuum side sealing oil;

[0011] The second oil retaining ring structure is an insulating part and is connected to the end cover. The second oil retaining ring structure is arranged on the side of the sealing shoe structure facing away from the transition ring. The second oil retaining ring structure is used to block the air side sealing oil and the remaining part of the vacuum side sealing oil.

[0012] The insulating sealing device provided by the present application can improve the insulation performance by insulatingly connecting the generator end cover, transition ring, sealing tile structure, first oil retaining ring structure and second oil retaining ring structure; the sealing tile structure can provide three layers of sealing oil to achieve a three-flow ring seal, effectively preventing hydrogen from leaking outward from the generator shaft, while also preventing air from entering the generator; the first oil retaining ring structure can block the sealing oil from entering the generator; the second oil retaining ring structure can block the sealing oil from leaking outward. Therefore, the present application can improve the insulation performance and sealing performance of the sealing device, ensure the safe operation of the generator equipment, and avoid explosion accidents caused by accidental hydrogen and oil leakage from the generator.

[0013] Optionally, the sealing tile structure includes:

[0014] A sealing shoe chamber is connected to the transition ring, and a hydrogen side sealing oil supply circuit, a vacuum side sealing oil supply circuit and an air side sealing oil supply circuit are provided in the sealing shoe chamber;

[0015] A sealing shoe assembly is arranged on the inner side of the sealing shoe chamber adjacent to the rotating shaft. The sealing shoe assembly is provided with a hydrogen side annular oil groove, a vacuum side annular oil groove and an air side annular oil groove. The hydrogen side annular oil groove is connected to the hydrogen side sealing oil supply circuit; the vacuum side annular oil groove is arranged between the hydrogen side annular oil groove and the air side annular oil groove, and is connected to the vacuum side sealing oil supply circuit; the air side annular oil groove is connected to the air side sealing oil supply circuit.

[0016] Optionally, the sealing shoe structure further includes a third oil slinger ring structure for blocking the hydrogen side sealing oil and part of the vacuum side sealing oil, and the third oil slinger ring structure includes:

[0017] a third oil deflector ring, which is an insulating member and is connected to the sealing shoe chamber and is disposed between the first oil deflector ring structure and the sealing shoe chamber;

[0018] The third oil slinger ring teeth are arranged on the inner side of the third oil slinger ring adjacent to the rotating shaft.

[0019] Optionally, the transition ring has an empty side and a hydrogen side, the empty side has a first empty side surface away from the rotating shaft and a second empty side surface adjacent to the rotating shaft, the first empty side surface is connected to the end cover, and the second empty side surface is connected to the sealing tile chamber; the hydrogen side is connected to the first oil retaining ring structure.

[0020] Optionally, a first annular insulating plate, a first sealing ring, a second sealing ring and a second annular insulating plate are provided at a connection between the first hollow side surface and the end cover, and are arranged in a radial direction away from the rotating shaft;

[0021] A first sealing ring cavity is provided between the first sealing ring and the second sealing ring, and the end cover is provided with a first glue injection channel connected to the first sealing ring cavity.

[0022] Optionally, a third annular insulating plate, a third sealing ring, a fourth sealing ring and a fourth annular insulating plate are provided at the connection between the second hollow side surface and the sealing tile chamber, and are arranged in a radial direction away from the rotating shaft;

[0023] There is a second sealing ring cavity between the third sealing ring and the fourth sealing ring, and the sealing shoe chamber is provided with a second glue injection channel connected to the second sealing ring cavity.

[0024] Optionally, the first oil slinger ring structure includes:

[0025] A first main oil slinger ring is connected to the transition ring, and a first main oil slinger ring tooth is provided on the inner side of the first main oil slinger ring adjacent to the rotating shaft;

[0026] The first sub-oil slinger ring is connected to the first main oil slinger ring, and the first sub-oil slinger ring is provided with first sub-oil slinger ring teeth on the inner side of the first sub-oil slinger ring adjacent to the rotating shaft.

[0027] Optionally, a first oil seal cavity is formed between the first main oil slinger ring, the first sub-oil slinger ring and the rotating shaft, and a second oil seal cavity is formed between the first main oil slinger ring, the transition ring, the sealing shoe structure and the rotating shaft;

[0028] The first main oil retaining ring is provided with an oil return elbow, the two ends of the oil return elbow are respectively connected to the first oil seal cavity and the second oil seal cavity, and the oil return elbow is used to introduce the sealing oil in the first oil seal cavity into the second oil seal cavity; the transition ring is provided with an oil return channel connected to the second oil seal cavity.

[0029] Optionally, the second oil slinger ring structure includes:

[0030] a second oil slinger ring connected to the end cover;

[0031] The second oil slinger ring teeth are arranged on the inner side of the second oil slinger ring adjacent to the rotating shaft.

[0032] The present application also provides a generator, comprising: the above-mentioned insulating sealing device.

[0033] The generator provided in the present application can effectively improve the safety of the equipment and ensure the normal operation of the generator through the above-mentioned insulating sealing device, thereby reducing the maintenance cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 This is one of the structural schematic diagrams of the insulating sealing device provided in an embodiment of the present application;

[0036] Figure 2 This is a second structural diagram of the insulating sealing device provided in an embodiment of the present application;

[0037] Figure 3 for Figure 2 A local enlarged view of point A;

[0038] Figure 4 for Figure 2 A partial enlarged view of point B;

[0039] Figure 5 A schematic diagram of the assembly structure of the first oil deflector ring structure and the transition ring provided in an embodiment of the present application;

[0040] Figure 6 Schematic diagram of the oil circuit structure of the sealing shoe structure provided in an embodiment of the present application.

[0041] Among them, the reference numerals in the figures are:

[0042] 1. End cover; 2. Rotating shaft; 3. Transition ring; 4. Sealing shoe structure; 5. First oil deflector ring structure;

[0043] 6. Second oil retaining ring structure; 7. Oil film gap; 8. Sealing shoe chamber; 9. Sealing shoe assembly;

[0044] 10. Hydrogen side sealing oil supply circuit; 11. Vacuum side sealing oil supply circuit;

[0045] 12. Air side sealing oil supply circuit; 13. Hydrogen side annular oil groove; 14. Vacuum side annular oil groove;

[0046] 15. Air side ring oil groove; 16. First sealing tile; 17. Second sealing tile; 18. Third sealing tile;

[0047] 19. Fourth sealing shoe; 20. First through groove; 21. Second through groove; 22. Third oil deflector ring structure;

[0048] 23. Third oil slinger ring; 24. Third oil slinger ring teeth; 25. First bolt; 26. First insulating gasket;

[0049] 27. First insulating sleeve; 28. Cover plate; 29. ​​Second bolt; 30. Second insulating gasket;

[0050] 31. Second insulating sleeve; 32. Fifth sealing ring; 33. Air side; 34. Hydrogen side;

[0051] 35. First hollow side surface; 36. Second hollow side surface; 37. First annular insulating plate;

[0052] 38. First sealing ring; 39. Second sealing ring; 40. Second annular insulating plate;

[0053] 41. First sealing ring cavity; 42. First glue injection channel; 43. Third bolt;

[0054] 44. Third insulating gasket; 45. Third insulating sleeve; 46. Third annular insulating plate;

[0055] 47. Third sealing ring; 48. Fourth sealing ring; 49. Fourth annular insulating plate;

[0056] 50. Second sealing ring cavity; 51. Second glue injection channel; 52. Fourth bolt;

[0057] 53. Fourth insulating gasket; 54. Fourth insulating sleeve; 55. First main oil retaining ring;

[0058] 56. First sub-oil slinger ring; 57. First main oil slinger ring gear; 58. First sub-oil slinger ring gear;

[0059] 59. Fifth bolt; 60. Fifth insulating gasket; 61. Fifth insulating sleeve; 62. Sixth sealing ring;

[0060] 63. First oil seal chamber; 64. Second oil seal chamber; 65. Oil return elbow; 66. Oil return channel;

[0061] 67. Third oil seal cavity; 68. Second oil sling ring; 69. Second oil sling ring teeth; 70. Sixth bolt;

[0062] 71. Sixth insulating gasket; 72. Sixth insulating sleeve; 73. Fastening screw; 74. Glued insulating gasket. DETAILED DESCRIPTION

[0063] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0064] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, the meaning of "plurality" is two or more, unless otherwise clearly specified.

[0066] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0067] According to the embodiment of the first aspect of the present application, referring to Figures 1-6 As shown, the present application provides an insulating sealing device, comprising a transition ring 3, a sealing shoe structure 4, a first oil retaining ring structure 5, and a second oil retaining ring structure 6, which are arranged between the end cover 1 and the rotating shaft 2 of the generator excitation end. The transition ring 3 is an insulating component and is connected to the end cover 1; the sealing shoe structure 4 is connected to the transition ring 3, and there is an oil film gap 7 between the sealing shoe structure 4 and the rotating shaft 2. The sealing shoe structure 4 is used to supply hydrogen side sealing oil, vacuum side sealing oil, and air side sealing oil to the oil film gap 7. The vacuum side sealing oil is used to isolate the hydrogen side sealing oil from the air side sealing oil; the first oil retaining ring structure 5 is connected to the transition ring 3, and the first oil retaining ring structure 5 is used to block the hydrogen side sealing oil and part of the vacuum side sealing oil; the second oil retaining ring structure 6 is an insulating component and is connected to the end cover 1. The second oil retaining ring structure 6 is arranged on the side of the sealing shoe structure 4 facing away from the transition ring 3, and the second oil retaining ring structure 6 is used to block the air side sealing oil and the remaining part of the vacuum side sealing oil.

[0068] In this embodiment of the present application, the transition ring 3 is an insulating part and is connected between the generator end cover 1 and the rotating shaft 2 as a basis for connecting other components. The purpose is to maintain electrical isolation of the entire sealing device and prevent current from being transmitted through these mechanical parts.

[0069] The sealing shoe structure 4 is connected to the transition ring 3. There is a tiny oil film gap 7 between it and the rotating shaft 2. The sealing shoe structure 4 can supply three kinds of sealing oil to the oil film gap 7: hydrogen side sealing oil, vacuum side sealing oil and air side sealing oil, which are used to form a sealing oil film and realize a three-flow ring seal. Specifically, in the actual oil supply process, the oil pressure of the hydrogen side sealing oil and the air side sealing oil are equal, and they can flow in opposite directions along the axial direction. In the middle of the hydrogen side sealing oil and the air side sealing oil, a third stream of vacuum-treated pressure oil, namely the vacuum side sealing oil, is introduced. The pressure of the vacuum side sealing oil is slightly higher than that of the hydrogen side sealing oil and the air side sealing oil. The vacuum side sealing oil is divided into two parts at the oil film gap 7 and flows in opposite directions along the axial direction to fully separate the hydrogen side sealing oil and the air side sealing oil on both sides, prevent the hydrogen side sealing oil and the air side sealing oil from contacting and exchanging, and further enhance the sealing effect.

[0070] The first oil retaining ring structure 5 is connected to the transition ring 3, and its main function is to prevent the hydrogen side sealing oil and part of the vacuum side sealing oil from entering the interior of the generator.

[0071] The second oil retaining ring structure 6 is an insulating part and is connected to the end cover 1. It is located on the side of the sealing shoe structure 4 away from the transition ring 3 and is close to the bearing of the generator for supporting the rotating shaft 2. Its function is to prevent the air side sealing oil and the remaining vacuum side sealing oil from leaking out and avoid mixing with the lubricating oil on the bearing.

[0072] The present application designs the transition ring 3 and the second oil retaining ring structure 6 as insulating parts and performs insulation treatment to ensure that no current passes through the transition ring 3, the sealing shoe structure 4, the first oil retaining ring structure 5 and the second oil retaining ring structure 6 and other components, which not only improves the insulation performance of the overall device, but also reduces the potential safety risks caused by electric arcs or electric sparks. In addition, by precisely controlling the oil pressure and oil volume, a stable sealing oil film is formed, which effectively isolates the internal and external environments of the generator. The formation and maintenance of the sealing oil film ensures that hydrogen will not leak out, and at the same time, external air will not enter the interior of the generator. In addition, the first oil retaining ring structure 5 and the second oil retaining ring structure 6 work together to ensure that the sealing oil will not enter the interior of the generator or leak out from the outside, which can reduce the risk of oil contamination.

[0073] Therefore, the insulating sealing device provided in the embodiment of the present application can effectively solve the problems of poor insulation and sealing of existing sealing devices, thereby improving the safety and reliability of equipment operation.

[0074] According to one embodiment of the present application, referring to Figure 2 and Figure 6As shown, the sealing shoe structure 4 includes: a sealing shoe chamber 8 and a sealing shoe assembly 9; the sealing shoe chamber 8 is connected to the transition ring 3, and three independent hydrogen side sealing oil supply circuits 10, vacuum side sealing oil supply circuits 11 and air side sealing oil supply circuits 12 are provided in the sealing shoe chamber 8; the sealing shoe assembly 9 is arranged on the inner side of the sealing shoe chamber 8 adjacent to the rotating shaft 2, and the sealing shoe assembly 9 is provided with a hydrogen side ring oil groove 13, a vacuum side ring oil groove 14 and an air side ring oil groove 15, and the hydrogen side ring oil groove 13 is connected to the hydrogen side sealing oil supply circuit 10; the vacuum side ring oil groove 14 is arranged between the hydrogen side ring oil groove 13 and the air side ring oil groove 15, and the vacuum side ring oil groove 14 is connected to the vacuum side sealing oil supply circuit 11; the air side ring oil groove 15 is connected to the air side sealing oil supply circuit 12.

[0075] In this embodiment of the present application, Figure 6 As shown by the middle arrow, hydrogen-side sealing oil flows from hydrogen-side sealing oil supply circuit 10 into hydrogen-side annular oil groove 13, flowing axially to the left. Vacuum-side sealing oil flows from vacuum-side sealing oil supply circuit 11 into vacuum-side annular oil groove 14, where it splits into two parts: one flowing axially to the left and the other flowing axially to the right, forming an intermediate isolation layer. Air-side sealing oil flows from air-side sealing oil supply circuit 12 into air-side annular oil groove 15, flowing axially to the right.

[0076] The oil films formed in the hydrogen-side annular oil groove 13, the vacuum-side annular oil groove 14, and the air-side annular oil groove 15 form three sealing barriers. The sealing oil pressures on the hydrogen and air sides are equal, while the vacuum-side sealing oil pressure is slightly higher. This helps form a stable oil film and prevents mixing of the hydrogen and air-side sealing oils.

[0077] Therefore, the sealing shoe structure 4 of the embodiment of the present application is a three-flow ring sealing design, which achieves an efficient sealing effect by forming independent oil films in different annular oil grooves, thereby ensuring the safety and reliability of the generator operation.

[0078] According to one embodiment of the present application, Figure 6 As shown, the sealing shoe assembly 9 includes four sealing shoes arranged side by side, with three oil grooves formed between the four sealing shoes. Specifically, the four sealing shoes are a first sealing shoe 16, a second sealing shoe 17, a third sealing shoe 18, and a fourth sealing shoe 19. The end surface of the first sealing shoe 16 is provided with a first through groove 20, and a hydrogen-side annular oil groove 13 is provided between the first sealing shoe 16 and the second sealing shoe 17. The hydrogen-side sealing oil supply circuit 10 is connected to the hydrogen-side annular oil groove 13 via the first through groove 20; the second sealing shoe 17 and the third sealing shoe 18 are provided with a vacuum-side annular oil groove 14, and the vacuum-side sealing oil supply circuit 11 is connected to the vacuum-side annular oil groove 14; the air-side annular oil groove 15 is provided between the third sealing shoe 18 and the fourth sealing shoe 19, and a second through groove 21 is provided on the end surface of the fourth sealing shoe 19. The air-side sealing oil supply circuit 12 is connected to the air-side annular oil groove 15 via the second through groove 21.

[0079] In actual operation, the generator includes three oil circuits: the hydrogen-side oil circuit, the vacuum-side oil circuit, and the air-side oil circuit. The hydrogen-side oil circuit includes a circulating hydrogen-side oil tank, a hydrogen-side oil pump, a sealing shoe structure 4, and a hydrogen-side oil return pipe. The vacuum-side oil circuit includes a connected vacuum-side oil tank, a vacuum-side oil pump, and a sealing shoe structure 4. The vacuum-side oil tank is a vacuum oil tank, and the vacuum-side oil pump is a vacuum oil pump. The air-side oil circuit includes a circulating air-side oil tank, an air-side oil pump, a sealing shoe structure 4, and an air-side oil return pipe.

[0080] Hydrogen side oil circuit: The hydrogen side oil pump pumps the hydrogen side sealing oil in the hydrogen side oil tank into the hydrogen side sealing oil supply circuit 10 of the sealing tile chamber 8, and then flows into the hydrogen side annular oil groove 13 through the first through groove 20, and then flows back to the hydrogen side oil tank along the oil film gap 7 at the rotating shaft 2 through the hydrogen side return oil pipe.

[0081] Air side oil circuit: The air side oil pump pumps the air side sealing oil in the air side oil tank into the air side sealing oil supply circuit 12 of the sealing tile chamber 8, and then flows into the air side annular oil groove 15 through the second through groove 21, and then flows back to the air side oil tank along the oil film gap 7 at the rotating shaft 2 through the air side return oil pipe.

[0082] Vacuum side oil circuit: The vacuum side oil pump pumps the vacuum side sealing oil in the vacuum side oil tank into the vacuum side sealing oil supply circuit 11 of the sealing tile chamber 8, and then flows into the vacuum side annular oil groove 14, and then splits into two paths along the oil film gap 7 at the rotating shaft 2, one path merges with the hydrogen side sealing oil and flows back to the hydrogen side oil tank through the hydrogen side return oil pipe, and the other path merges with the air side sealing oil and flows back to the air side oil tank through the air side return oil pipe.

[0083] It can be understood that the air side sealing oil is the main sealing oil. If the hydrogen side oil circuit is out of operation for some reason, the hydrogen can still be sealed in the generator through the operation of the air side oil circuit.

[0084] In some embodiments, in order to facilitate oil supply, oil passages corresponding to the three oil circuits may be provided on the end cover 1 and the transition ring 3 of the generator.

[0085] Taking the hydrogen side oil circuit as an example, the hydrogen side oil pump pumps the hydrogen side sealing oil in the hydrogen side oil tank into the oil channel of the generator end cover 1, and then flows into the hydrogen side sealing oil supply circuit 10 of the sealing tile chamber 8 through the oil channel on the transition ring 3, and then flows into the hydrogen side ring oil groove 13 through the first through groove 20, and then flows back to the hydrogen side oil tank along the oil film gap 7 at the rotating shaft 2 through the hydrogen side return oil pipe.

[0086] According to one embodiment of the present application, referring to Figure 1 、 Figure 2 and Figure 6As shown, the sealing shoe structure 4 also includes a third oil retaining ring structure 22 for blocking the hydrogen side sealing oil and part of the vacuum side sealing oil. The third oil retaining ring structure 22 includes: a third oil retaining ring 23 and a third oil retaining ring tooth 24. The third oil retaining ring 23 is an insulating part and is connected to the sealing shoe chamber 8. The third oil retaining ring 23 is arranged between the first oil retaining ring structure 5 and the sealing shoe chamber 8; the third oil retaining ring tooth 24 is arranged on the inner side of the third oil retaining ring 23 adjacent to the rotating shaft 2.

[0087] Specifically, the third oil deflector ring 23 is connected to the sealing shoe chamber 8 through the first bolt 25 and the first insulating gasket 26 , and the first insulating sleeve 27 is sleeved on the first bolt 25 .

[0088] The embodiment of the present application can further improve the oil blocking effect through the third oil blocking ring structure 22, preventing the sealing oil from entering the interior of the generator, and the sealing oil blocked there can flow back to the hydrogen side oil tank through the hydrogen side return oil pipeline.

[0089] According to one embodiment of the present application, referring to Figure 2 and Figure 6 As shown, the sealing shoe chamber 8 includes a cover plate 28, on which an air side sealing oil supply circuit 12 is provided, and an accommodating cavity for fixing the sealing shoe assembly 9 is formed between the cover plate 28 and the inner side of the sealing shoe chamber 8 adjacent to the rotating shaft 2.

[0090] During assembly, the first sealing tile 16 and the second sealing tile 17 are fixed by pins to ensure their relative positions; the third sealing tile 18 and the fourth sealing tile 19 are fixed by pins to ensure their relative positions; then the two assembled sealing tiles are fixed by connecting bolts to form the entire sealing tile assembly 9; an anti-rotation pin is provided on the sealing tile chamber 8, and the entire sealing tile assembly 9 is fixed in the accommodating cavity by the anti-rotation pin to prevent rotation; then the cover plate 28 is fixed to the sealing tile chamber 8 by the second bolt 29 and the corresponding second insulating gasket 30, and the second bolt 29 is provided with a second insulating sleeve 31.

[0091] In addition, a fifth sealing ring 32 is provided between the outer side of the cover plate 28 away from the rotating shaft 2 and the sealing shoe chamber 8 to improve the sealing performance.

[0092] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the transition ring 3 has an air side 33 and a hydrogen side 34. The air side 33 has a first air side 35 away from the rotating shaft 2 and a second air side 36 adjacent to the rotating shaft. The first air side 35 is connected to the end cover 1, and the second air side 36 is connected to the sealing shoe chamber 8. The hydrogen side 34 is connected to the first oil deflector ring structure 5. Because the transition ring 3 is an insulating component, this design can effectively improve the insulation performance of the device, thereby ensuring the safe operation of the generator equipment.

[0093] According to one embodiment of the present application, referring to Figure 2 and Figure 3 As shown, the connection between the first empty side surface 35 of the transition ring 3 and the end cover 1 is provided with a first annular insulating plate 37, a first sealing ring 38, a second sealing ring 39 and a second annular insulating plate 40 arranged in a radial direction away from the rotating shaft 2; and a first sealing ring cavity 41 is provided between the first sealing ring 38 and the second sealing ring 39, and the end cover 1 is provided with a first glue injection channel 42 connected to the first sealing ring cavity 41.

[0094] In this embodiment of the present application, the provision of the first annular insulating plate 37 and the second annular insulating plate 40 ensures electrical isolation between the first hollow side 35 of the transition ring 3 and the end cap 1. These insulating plates can effectively prevent current from being transferred through the connection, thereby improving the insulation performance of the entire device.

[0095] The first sealing ring cavity 41 formed between the first sealing ring 38 and the second sealing ring 39 provides an additional sealing barrier. Sealant is injected into the first sealing ring cavity 41 through the first injection channel 42 to achieve multi-level sealing, which can further enhance the sealing effect and prevent oil leakage.

[0096] During assembly, the transition ring 3 is connected to the generator end cover 1 through the third bolt 43 and the corresponding third insulating gasket 44. The third bolt 43 passes through the first annular insulating plate 37, and the third insulating sleeve 45 is sleeved on the third bolt 43.

[0097] According to one embodiment of the present application, referring to Figure 2 and Figure 4 As shown, the connection between the second empty side surface 36 of the transition ring 3 and the sealing shoe chamber 8 is provided with a third annular insulating plate 46, a third sealing ring 47, a fourth sealing ring 48 and a fourth annular insulating plate 49 arranged in a radial direction away from the rotating shaft 2; and there is a second sealing ring cavity 50 between the third sealing ring 47 and the fourth sealing ring 48, and the sealing shoe chamber 8 is provided with a second glue injection channel 51 connected to the second sealing ring cavity 50.

[0098] In this embodiment of the present application, the provision of the third annular insulating plate 46 and the fourth annular insulating plate 49 ensures electrical isolation between the second empty side surface 36 of the transition ring 3 and the sealing tile chamber 8. These insulating plates can effectively prevent current from being transmitted through the connection, thereby improving the insulation performance of the entire device.

[0099] The second sealing ring cavity 50 formed between the third sealing ring 47 and the fourth sealing ring 48 provides an additional sealing barrier. Sealant is injected into the second sealing ring cavity 50 through the second injection channel 51, achieving multi-level sealing, which can further enhance the sealing effect and prevent oil leakage.

[0100] During assembly, the sealing tile chamber 8 is connected to the transition ring 3 through the fourth bolt 52 and the corresponding fourth insulating gasket 53. The fourth bolt 52 is passed through the fourth annular insulating plate 49, and the fourth insulating sleeve 54 is sleeved on the fourth bolt 52.

[0101] According to one embodiment of the present application, referring to Figure 2 and Figure 5 As shown, the first oil retaining ring structure 5 includes: a first main oil retaining ring 55 and a first sub-oil retaining ring 56. The first main oil retaining ring 55 is connected to the transition ring 3, and the first main oil retaining ring 55 is adjacent to the inner side of the rotating shaft 2 and is provided with a first main oil retaining ring tooth 57; the first sub-oil retaining ring 56 is obliquely connected to the first main oil retaining ring 55, and the first sub-oil retaining ring 56 is adjacent to the inner side of the rotating shaft 2 and is provided with a first sub-oil retaining ring tooth 58.

[0102] During assembly, the first main oil retaining ring 55 is connected to the transition ring 3 through the fifth bolt 59 and the corresponding fifth insulating gasket 60 , and the fifth bolt 59 is sleeved with a fifth insulating sleeve 61 .

[0103] A sixth sealing ring 62 is provided between the outer side of the first main oil slinger ring 55 away from the rotating shaft 2 and the transition ring 3 to improve the sealing performance.

[0104] The embodiment of the present application uses two oil retaining ring structures to effectively prevent hydrogen side sealing oil and part of vacuum side sealing oil from entering the interior of the generator.

[0105] Furthermore, a plurality of the first main oil deflector ring teeth 57 and the first sub-oil deflector ring teeth 58 can be arranged at intervals along the axial direction. Such a design can further improve the oil deflection effect.

[0106] According to one embodiment of the present application, referring to Figure 1 and Figure 5 As shown, Figure 5 The figure shows the lower half of the first oil slinger structure 5 and the transition ring 3, located below the rotating shaft 2. A first oil seal cavity 63 is formed between the first main oil slinger 55, the first sub-oil slinger 56, and the rotating shaft 2. A second oil seal cavity 64 is formed between the first main oil slinger 55, the transition ring 3, the sealing shoe structure 4, and the rotating shaft 2. An oil return elbow 65 is provided on the first main oil slinger 55, with its ends respectively connected to the first oil seal cavity 63 and the second oil seal cavity 64. The oil return elbow 65 is used to guide the sealing oil in the first oil seal cavity 63 into the second oil seal cavity 64. The transition ring 3 is provided with an oil return channel 66 connected to the second oil seal cavity 64.

[0107] Specifically, during the rotation of the generator shaft 2, the hydrogen-side sealing oil and some of the vacuum-side sealing oil in the first and second oil-sealed chambers 63, 64 will deposit at the bottom of their respective chambers. Therefore, an oil return elbow 65 can be provided at the bottom of the first oil-sealed chamber 63. The first end of the oil return elbow 65 is connected to the first oil-sealed chamber 63, and the second end is connected to the second oil-sealed chamber 64. The first end of the oil return elbow 65 is higher than the second end, and the second end of the oil return elbow 65 has a U-shaped structure. An oil return channel 66 is also provided at the bottom of the second oil-sealed chamber 64. The oil return channel 66 can be connected to the hydrogen-side oil return pipeline.

[0108] The sealing oil deposited in the first oil seal chamber 63 is discharged into the second oil seal chamber 64 through the return oil elbow 65 under the action of gravity, and part of the sealing oil accumulates in the U-shaped structure tube body of the return oil elbow 65 to achieve oil sealing. The sealing oil in the second oil seal chamber 64 is discharged into the hydrogen side return oil pipeline through the return oil channel 66, and then flows back to the hydrogen side oil tank.

[0109] With such a design, on the one hand, the sealing oil in the first oil seal chamber 63 can be collected into the second oil seal chamber 64 for centralized discharge; on the other hand, the U-shaped oil seal design can prevent the sealing oil in the second oil seal chamber 64 from flowing back into the first oil seal chamber 63, thereby preventing the sealing oil from entering the interior of the generator.

[0110] According to one embodiment of the present application, referring to Figure 1 As shown, a third oil seal cavity 67 is constructed between the generator end cover 1, the transition ring 3, the sealing shoe structure 4, the second oil retaining ring structure 6 and the rotating shaft 2. The sealing oil blocked in the third oil seal cavity 67 by the second oil retaining ring structure 6 can flow back to the air side oil tank through the air side return oil pipe.

[0111] According to one embodiment of the present application, referring to Figure 2 and Figure 6 As shown, the second oil slinger ring structure 6 includes: a second oil slinger ring 68 and second oil slinger ring teeth 69. The second oil slinger ring 68 is connected to the end cover 1; the second oil slinger ring teeth 69 are arranged on the inner side of the second oil slinger ring 68 adjacent to the rotating shaft 2. In addition, multiple second oil slinger ring teeth 69 can be arranged at intervals along the axial direction. Such a design can further improve the oil blocking effect and effectively prevent the leakage of air-side sealing oil and residual vacuum-side sealing oil.

[0112] During assembly, the second oil retaining ring 68 is connected to the end cover 1 through the sixth bolt 70 and the corresponding sixth insulating gasket 71 , and the sixth bolt 70 is sleeved with a sixth insulating sleeve 72 .

[0113] The following describes the installation process of the insulating sealing device provided by the present application with reference to a specific example, which generally includes:

[0114] 1. Install the oil return elbow 65 onto the first oil deflector ring structure 5 through a plurality of fastening screws 73 and a glued insulating gasket 74, and use a heating device to cure the glued insulating gasket 74.

[0115] 2. Use a lifting device to lift the first oil deflector ring structure 5 to the side of the transition ring 3 , then adjust the concentricity of the first oil deflector ring structure 5 and the transition ring 3 , and fix the first oil deflector ring structure 5 to the transition ring 3 with the fifth bolt 59 .

[0116] 3. Use epoxy glue to bond the four annular insulating plates (the first annular insulating plate 37 to the fourth annular insulating plate 49) to the transition ring 3 and fix them with rivets. Use a heating device to cure the insulating plates.

[0117] 4. Install four sealing rings (first sealing ring 38 to fourth sealing ring 48) between the transition ring 3 and the generator end cover 1, adjust the gap between the first oil retaining ring structure 5 and the rotating shaft 2 to meet the usage standards, and then use the third bolt 43 to fix the transition ring 3 to the end cover 1.

[0118] 5. Adjust the gap between the sealing tile chamber 8 and the rotating shaft 2 to meet the usage standards, connect the sealing tile chamber 8 to the transition ring 3 through the fourth bolt 52, adjust the gap between the third oil deflector ring structure 22 and the rotating shaft 2 to meet the usage standards, and then connect the third oil deflector ring structure 22 to the sealing tile chamber 8 through the first bolt 25.

[0119] 6. Fix the entire sealing shoe assembly 9 in the accommodating cavity inside the sealing shoe chamber 8 through the anti-rotation pin, and then fix the cover plate 28 to the sealing shoe chamber 8 through the second bolt 29.

[0120] 7. Adjust the gap between the second oil deflector ring structure 6 and the rotating shaft 2 to meet the use standard, and then connect the second oil deflector ring structure 6 to the end cover 1 through the sixth bolt 70.

[0121] 8. Measure the insulation between the end cover 1, the rotating shaft 2, the transition ring 3, the sealing shoe chamber 8, the first oil deflector ring structure 5, the second oil deflector ring structure 6, the third oil deflector ring structure 22 and the cover plate 28 to ensure the insulation between the components.

[0122] In some actual installation conditions, components such as the transition ring 3, the sealing tile chamber 8, the first oil retaining ring structure 5, the second oil retaining ring structure 6, the third oil retaining ring structure 22 and the cover plate 28 can be divided into two parts above and below the rotating shaft 2. Then, sealant can be evenly applied on the center dividing surface between the two parts of each component, and the two parts of each component can be fixed and spliced ​​into a whole using center dividing surface bolts and pins.

[0123] According to an embodiment of the second aspect of the present application, the present application also provides a generator, including: the insulating sealing device of the above embodiment.

[0124] The generator provided in the embodiment of the present application can effectively improve the safety of the equipment and ensure the normal operation of the generator through the insulating sealing device of the above embodiment, thereby reducing the maintenance cost of the equipment.

[0125] The above is only a preferred embodiment of the present application and is not intended to limit the embodiments of the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. An insulating sealing device, characterized in that: The invention comprises a transition ring, a sealing shoe structure, a first oil deflector ring structure and a second oil deflector ring structure, which are used to be arranged between the end cover of the generator excitation end and the rotating shaft, wherein: The transition ring is an insulating member and is connected to the end cover; The sealing shoe structure is connected to the transition ring, and an oil film gap is defined between the sealing shoe structure and the rotating shaft. The sealing shoe structure is used to supply hydrogen side sealing oil, vacuum side sealing oil, and air side sealing oil to the oil film gap. The vacuum side sealing oil is used to isolate the hydrogen side sealing oil from the air side sealing oil. The first oil retaining ring structure is connected to the transition ring, and the first oil retaining ring structure is used to retain the hydrogen side sealing oil and part of the vacuum side sealing oil; The second oil retaining ring structure is an insulating part and is connected to the end cover. The second oil retaining ring structure is arranged on the side of the sealing shoe structure facing away from the transition ring. The second oil retaining ring structure is used to block the air side sealing oil and the remaining part of the vacuum side sealing oil.

2. The insulating sealing device according to claim 1, characterized in that: The sealing tile structure comprises: A sealing shoe chamber is connected to the transition ring, and a hydrogen side sealing oil supply circuit, a vacuum side sealing oil supply circuit and an air side sealing oil supply circuit are provided in the sealing shoe chamber; A sealing shoe assembly is arranged on the inner side of the sealing shoe chamber adjacent to the rotating shaft. The sealing shoe assembly is provided with a hydrogen side annular oil groove, a vacuum side annular oil groove and an air side annular oil groove. The hydrogen side annular oil groove is connected to the hydrogen side sealing oil supply circuit; the vacuum side annular oil groove is arranged between the hydrogen side annular oil groove and the air side annular oil groove, and is connected to the vacuum side sealing oil supply circuit; the air side annular oil groove is connected to the air side sealing oil supply circuit.

3. The insulating sealing device according to claim 2, characterized in that: The sealing shoe structure further includes a third oil slinger ring structure for blocking the hydrogen side sealing oil and part of the vacuum side sealing oil, the third oil slinger ring structure including: a third oil deflector ring, which is an insulating member and is connected to the sealing shoe chamber and is disposed between the first oil deflector ring structure and the sealing shoe chamber; The third oil slinger ring teeth are arranged on the inner side of the third oil slinger ring adjacent to the rotating shaft.

4. The insulating sealing device according to claim 2, characterized in that: The transition ring has an empty side and a hydrogen side, the empty side has a first empty side surface away from the rotating shaft and a second empty side surface adjacent to the rotating shaft, the first empty side surface is connected to the end cover, and the second empty side surface is connected to the sealing shoe chamber; the hydrogen side is connected to the first oil retaining ring structure.

5. The insulating sealing device according to claim 4, characterized in that: A first annular insulating plate, a first sealing ring, a second sealing ring and a second annular insulating plate are provided at the connection between the first hollow side surface and the end cover, and are arranged in a radial direction away from the rotating shaft; A first sealing ring cavity is provided between the first sealing ring and the second sealing ring, and the end cover is provided with a first glue injection channel connected to the first sealing ring cavity.

6. The insulating sealing device according to claim 4, characterized in that: A third annular insulating plate, a third sealing ring, a fourth sealing ring and a fourth annular insulating plate are provided at the connection between the second hollow side and the sealing tile chamber, and are arranged in a radial direction away from the rotating shaft; There is a second sealing ring cavity between the third sealing ring and the fourth sealing ring, and the sealing shoe chamber is provided with a second glue injection channel connected to the second sealing ring cavity.

7. The insulating sealing device according to any one of claims 1 to 6, characterized in that: The first oil slinger ring structure comprises: A first main oil slinger ring is connected to the transition ring, and a first main oil slinger ring tooth is provided on the inner side of the first main oil slinger ring adjacent to the rotating shaft; The first sub-oil slinger ring is connected to the first main oil slinger ring, and the first sub-oil slinger ring is provided with first sub-oil slinger ring teeth on the inner side of the first sub-oil slinger ring adjacent to the rotating shaft.

8. The insulating sealing device according to claim 7, characterized in that: A first oil seal cavity is formed between the first main oil slinger ring, the first sub-oil slinger ring and the rotating shaft, and a second oil seal cavity is formed between the first main oil slinger ring, the transition ring, the sealing shoe structure and the rotating shaft; The first main oil retaining ring is provided with an oil return elbow, the two ends of the oil return elbow are respectively connected to the first oil seal cavity and the second oil seal cavity, and the oil return elbow is used to introduce the sealing oil in the first oil seal cavity into the second oil seal cavity; the transition ring is provided with an oil return channel connected to the second oil seal cavity.

9. The insulating sealing device according to any one of claims 1 to 6, characterized in that: The second oil slinger ring structure includes: a second oil slinger ring connected to the end cover; The second oil slinger ring teeth are arranged on the inner side of the second oil slinger ring adjacent to the rotating shaft.

10. A generator, characterized in that: include: The insulating sealing device according to any one of claims 1 to 9.

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