Zero-grounding full-sealing oil sealing structure

Abstract

The invention belongs to the technical field of steam turbine generator oil sealing, and particularly relates to a zero-grounding full-sealing oil sealing structure. According to the technical scheme, the zero-grounding full-sealing oil sealing structure comprises a transition plate, an end cover and a sealing seat are connected to the transition plate, insulating plates are arranged between the transition plate and the end cover and between the transition plate and the sealing seat, through glue injection holes are formed in the end cover and the sealing seat, and glue injection grooves are formed in the positions, corresponding to the glue injection holes, of the transition plate. A sealing strip is arranged on the outer side of the glue injection groove, and the insulating plate is disconnected in an area defined by the sealing strip; the side, facing the transition plate, of the end cover and the side, facing the transition plate, of the sealing seat are both connected with annular insulating plates, and the annular insulating plates cover the sealing strips. The invention provides a zero-grounding full-sealing oil sealing structure.

Description

Technical Field

[0001] The invention belongs to the technical field of turbine generator oil seals, and in particular relates to a zero-ground fully sealed oil seal structure. Background Art

[0002] like Figure 3 As shown, in order to facilitate online detection of generator oil seal insulation, considering the rigidity, thin insulating plates are added between the transition ring of the existing oil seal structure and the end cover and the transition ring, and they are bolted together; Figure 4 As shown, at the closing bolt, insulation is achieved at the closing bolt position through an insulating tube and an insulating washer.

[0003] like Figure 5 As shown in the figure, the double sealing strip and the injection groove injection method can achieve triple sealing. The disadvantage is that due to the size of the sealing strip, the compression amount and the connection stiffness, the design distance between the transition ring and the end cover or the transition ring and the sealing seat is relatively close. When ferromagnetic impurities are mistakenly introduced into the sealant injected into the injection groove, it often leads to unqualified insulation of the components, thus affecting the safe operation of the generator or the on-site maintenance cycle. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the object of the present invention is to provide a zero-ground fully sealed oil sealing structure.

[0005] The technical solution adopted by the present invention is:

[0006] A zero-ground fully sealed oil sealing structure comprises a transition plate, an end cover and a sealing seat are respectively connected to the transition plate, an insulating plate is arranged between the transition plate and the end cover, and between the transition plate and the sealing seat, through glue injection holes are arranged on the end cover and the sealing seat, a glue injection groove is arranged at the position corresponding to the glue injection hole on the transition plate, a sealing strip is arranged on the outside of the glue injection groove, and the insulating plate is disconnected at the area surrounded by the sealing strip; the end cover and the sealing seat are connected to an annular insulating plate on the side facing the transition plate, and the annular insulating plate covers the sealing strip.

[0007] The present invention aims to solve the problem that the insulation at the sealing part is easily affected by the quality or impurities of the sealant, by processing an annular groove at the position of the sealing seat and the end cover corresponding to the seal, and embedding the annular insulating plate. Since the annular insulating plate covers the sealing strip, the overlapping surfaces of the insulating plate and the annular insulating plate overlap, making the insulation path continuous, so as to completely eliminate the influence of the ferromagnetic impurities of the injection glue, thereby achieving zero grounding without changing the original hydrogen sealing structure.

[0008] As a preferred embodiment of the present invention, a through hole is provided on the annular insulating plate, and the inner diameter of the through hole is the same as the glue injection hole, and the through hole and the glue injection hole coincide. The through hole is provided on the annular insulating plate to avoid covering the glue injection hole. The inner diameter of the through hole is the same as the glue injection hole, thereby ensuring that the inner side of the annular insulating plate can completely cover the sealing strip.

[0009] As a preferred solution of the present invention, an annular groove is provided on the side of the end cover and the sealing seat facing the transition plate, and the annular insulating plate is arranged in the annular groove.

[0010] As a preferred solution of the present invention, the end cover and the sealing seat are respectively bonded to the insulating plate by epoxy adhesive and tightened with screws. The insulating plate of the present invention is bonded by epoxy adhesive and tightened with screws, so that the insulating plate is fixed more reliably through a double connection method.

[0011] As a preferred solution of the present invention, a connection hole is provided on the annular insulating plate, the connection hole of the annular insulating plate is connected to the end cover or the sealing seat by screws, and an insulating cover for covering the screws is provided in the connection hole of the annular insulating plate. The connection screws of the annular insulating plate are covered with the insulating cover to ensure the continuity of the insulation path.

[0012] As a preferred solution of the present invention, the transition plate is provided with a mounting groove, and the sealing strip is arranged in the mounting groove. The insulating plate is thinned in the area close to the sealing strip, so that the outer edge of the mounting groove is raised to better fix the sealing strip. The mounting groove protrudes from the surface of the transition plate to ensure that the sealing strip can reliably seal the gap between the transition plate and the end cover, and between the transition plate and the sealing seat. The mounting groove can reliably fix the sealing strip to avoid dislocation of the sealing strip.

[0013] As a preferred solution of the present invention, the outer edge of the annular insulating plate is aligned with the outer edge of the thinned region of the insulating plate. The annular insulating plate and the insulating plate overlap to ensure reliable insulation.

[0014] As a preferred solution of the present invention, the end cover and the sealing seat are respectively connected to the transition plate by bolts.

[0015] As a preferred solution of the present invention, an insulating tube is sleeved on the screw rod of the closing bolt, and insulating washers are respectively arranged between the end cover and the sealing seat and the nut of the closing bolt. At the closing bolt, insulation is achieved at the closing bolt by the insulating tube and the insulating washer to ensure reliable insulation.

[0016] As a preferred solution of the present invention, the insulating plate, the insulating cylinder and the insulating gasket are in sealed contact end to end in sequence.

[0017] The beneficial effects of the present invention are:

[0018] The present invention aims to solve the problem that the insulation at the sealing part is easily affected by the quality or impurities of the sealant, by processing an annular groove at the position of the sealing seat and the end cover corresponding to the seal, and embedding the annular insulating plate. Since the annular insulating plate covers the sealing strip, the overlapping surfaces of the insulating plate and the annular insulating plate overlap, making the insulation path continuous, so as to completely eliminate the influence of the ferromagnetic impurities of the injection glue, thereby achieving zero grounding without changing the original hydrogen sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the fixing structure of the annular insulating plate;

[0021] Figure 3 is a schematic diagram of the structure of the present invention when the annular insulating plate is not provided;

[0022] Figure 4 It is a partial structural diagram of the present invention;

[0023] Figure 5 It is a partial structural diagram of the present invention when the annular insulating plate is not provided.

[0024] In the figure: 1-transition plate; 2-end cover; 3-sealing seat; 4-insulating plate; 5-glue injection hole; 6-glue injection groove; 7-sealing strip; 8-annular insulating plate; 9-screw; 10-insulating cover; 11-clamping bolt; 12-insulating cylinder; 13-insulating gasket; 14-gasket. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0027] like Figure 1 to Figure 5 As shown, the zero-grounded fully sealed oil sealing structure of this embodiment includes a transition plate 1, to which an end cover 2 and a sealing seat 3 are respectively connected, an insulating plate 4 is arranged between the transition plate 1 and the end cover 2, and between the transition plate 1 and the sealing seat 3, and a through glue injection hole 5 is arranged on the end cover 2 and the sealing seat 3, a glue injection groove 6 is arranged at a position corresponding to the glue injection hole 5 on the transition plate 1, a sealing strip 7 is arranged on the outer side of the glue injection groove 6, and the insulating plate 4 is disconnected at the area surrounded by the sealing strip 7; the end cover 2 and the sealing seat 3 are connected to an annular insulating plate 8 on the side facing the transition plate 1, and the annular insulating plate 8 covers the sealing strip 7.

[0028] In order to solve the problem that the insulation at the sealing part is easily affected by the quality or impurities of the sealant, the present invention processes an annular groove at the position of the seal seat 3 and the end cover 2 corresponding to the seal, and embeds the annular insulating plate 8. Since the annular insulating plate 8 covers the sealing strip 7, the overlapping surfaces of the insulating plate 4 and the annular insulating plate 8 overlap, making the insulation path continuous, so as to completely eliminate the influence of the ferromagnetic impurities of the injection glue, thereby achieving zero grounding without changing the original hydrogen sealing structure.

[0029] Furthermore, the annular insulating plate 8 is provided with a through hole, the inner diameter of the through hole is the same as the glue injection hole 5, and the through hole coincides with the glue injection hole 5. The through hole is provided on the annular insulating plate 8 to avoid covering the glue injection hole 5. The inner diameter of the through hole is the same as the glue injection hole 5, thereby ensuring that the inner side of the annular insulating plate 8 can completely cover the sealing strip 7.

[0030] Specifically, an annular groove is provided on one side of the end cover 2 and the sealing seat 3 facing the transition plate 1, and the annular insulating plate 8 is provided in the annular groove.

[0031] The end cover 2 and the sealing seat 3 are respectively bonded to the insulating plate 4 by epoxy adhesive and tightened by screws 9. The annular insulating plate 8 of the present invention is bonded by epoxy adhesive and tightened by screws 9, so that the insulating plate 4 is fixed more reliably through a double connection mode.

[0032] The annular insulating plate 8 is provided with a connection hole, and the connection hole of the annular insulating plate 8 is connected to the end cover 2 or the sealing seat 3 through a screw 9, and an insulating cover 10 for covering the screw 9 is provided in the connection hole of the annular insulating plate 8. The connection screw 9 of the annular insulating plate 8 is covered with the insulating cover 10 to ensure the continuity of the insulation path.

[0033] In order to facilitate the fixing of the sealing strip 7, a mounting groove is provided on the transition plate 1, and the sealing strip 7 is arranged in the mounting groove. The mounting groove protrudes from the surface of the transition plate 1, ensuring that the sealing strip 7 can reliably seal the gap between the transition plate 1 and the end cover 2, and between the transition plate 1 and the sealing seat 3. The mounting groove can reliably fix the sealing strip 7 and prevent the sealing strip 7 from being misplaced.

[0034] Furthermore, the insulating plate 4 is thinned in the area close to the sealing strip 7 , so that the outer edge of the mounting groove is raised to better fix the sealing strip 7 .

[0035] The outer edge of the annular insulating plate 8 is aligned with the outer edge of the thinned area of ​​the insulating plate 4. The annular insulating plate 8 overlaps with the insulating plate 4 to ensure reliable insulation.

[0036] Specifically, the end cover 2 and the sealing seat 3 are respectively connected to the transition plate 1 by means of bolts 11 .

[0037] Furthermore, an insulating tube 12 is sleeved on the screw rod of the closing bolt 11, and insulating washers 13 are respectively arranged between the end cover 2 and the sealing seat 3 and the nut of the closing bolt 11. At the closing bolt 11, insulation is achieved at the closing bolt 11 by the insulating tube 12 and the insulating washer 13, ensuring reliable insulation.

[0038] The insulating plate 4 , the insulating tube 12 and the insulating gasket 13 are in sealing contact with each other end to end. A plurality of gaskets 14 are arranged between the insulating gasket 13 and the nut of the bolt 11 .

[0039] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A zero-ground fully sealed oil seal structure, characterized in that: The invention comprises a transition plate (1), the transition plate (1) is respectively connected to an end cover (2) and a sealing seat (3), an insulating plate (4) is arranged between the transition plate (1) and the end cover (2), and between the transition plate (1) and the sealing seat (3), the end cover (2) and the sealing seat (3) are both provided with through-going glue injection holes (5), a glue injection groove (6) is arranged at a position corresponding to the glue injection hole (5) on the transition plate (1), a sealing strip (7) is arranged outside the glue injection groove (6), and the insulating plate (4) is disconnected at the area surrounded by the sealing strip (7); the end cover (2) and the sealing seat (3) are both connected to an annular insulating plate (8) on one side facing the transition plate (1), and the annular insulating plate (8) covers the sealing strip (7).

2. A zero-ground fully sealed oil seal structure according to claim 1, characterized in that: The annular insulating plate (8) is provided with a through hole, the inner diameter of the through hole is the same as the glue injection hole (5), and the through hole and the glue injection hole (5) coincide with each other.

3. A zero-ground fully sealed oil seal structure according to claim 1, characterized in that: An annular groove is provided on the side of the end cover (2) and the sealing seat (3) facing the transition plate (1), and the annular insulating plate (8) is arranged in the annular groove.

4. A zero-ground fully sealed oil seal structure according to claim 1, characterized in that: The end cover (2) and the sealing seat (3) are respectively bonded to the insulating plate (4) by epoxy adhesive and tightened by screws (9).

5. A zero-ground fully sealed oil seal structure according to claim 4, characterized in that: The insulating plate (4) is provided with a connection hole, the connection hole of the insulating plate (4) is connected to the end cover (2) or the sealing seat (3) via a screw (9), and an insulating cover (10) for covering the screw (9) is arranged in the connection hole of the insulating plate (4).

6. A zero-ground fully sealed oil seal structure according to claim 1, characterized in that: The transition plate (1) is provided with a mounting groove, and the sealing strip (7) is arranged in the mounting groove; the insulating plate (4) is thinned in a region close to the sealing strip (7).

7. A zero-ground fully sealed oil seal structure according to claim 6, characterized in that: The outer edge of the annular insulating plate (8) is aligned with the outer edge of the thinned region of the insulating plate (4).

8. The zero-ground fully sealed oil seal structure according to claim 1, characterized in that: The end cover (2) and the sealing seat (3) are respectively connected to the transition plate (1) via bolts (11).

9. A zero-ground fully sealed oil seal structure according to claim 8, characterized in that: An insulating tube (12) is sleeved on the screw rod of the closing bolt (11), and insulating washers (13) are respectively arranged between the end cover (2) and the sealing seat (3) and the nut of the closing bolt (11).

10. A zero-ground fully sealed oil seal structure according to claim 9, characterized in that: The insulating plate (4), the insulating cylinder (12) and the insulating gasket (13) are in sealing contact with each other end to end.

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