A zero ground totally sealed oil seal structure

Abstract

The present application belongs to the technical field of oil seal of steam turbine generator, and particularly relates to a zero-grounding full-sealing oil seal structure. The technical scheme is as follows: a zero-grounding full-sealing oil seal structure, comprising a transition plate, the transition plate is connected with an end cover and a sealing seat respectively, an insulation plate is arranged between the transition plate and the end cover and between the transition plate and the sealing seat, the end cover and the sealing seat are both provided with a through glue injection hole, the transition plate is provided with a glue injection groove corresponding to the position of the glue injection hole, a sealing strip is arranged outside the glue injection groove, and the insulation plate is disconnected at the area surrounded by the sealing strip; the side of the end cover and the sealing seat facing the transition plate is connected with a ring-shaped insulation plate, and the ring-shaped insulation plate covers the sealing strip. The present application provides a zero-grounding full-sealing oil seal structure.

Description

Technical Field

[0001] This invention belongs to the field of steam turbine generator oil sealing technology, and specifically relates to a zero-grounding fully sealed oil sealing structure. Background Technology

[0002] like Figure 3 As shown, to facilitate online testing of the generator oil seal insulation, and considering rigidity considerations, thin insulating plates are added between the transition ring of the existing oil seal structure and the end cover, and then bolted together; as Figure 4 As shown, insulation at the engagement bolt is achieved using an insulating cylinder and an insulating washer.

[0003] like Figure 5 As shown, triple sealing can be achieved through double sealing strips and glue injection grooves. However, a drawback is that due to the size of the sealing strips, compression, and connection rigidity, the design distance between the transition ring and the end cap or between the transition ring and the sealing seat is relatively close. If ferromagnetic impurities are accidentally introduced into the sealant injected into the glue injection groove, it often leads to substandard insulation of 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-mentioned problems in the prior art, the purpose of this invention is to provide a zero-grounding, fully sealed oil seal structure.

[0005] The technical solution adopted in this invention is as follows:

[0006] A zero-ground, fully sealed oil-sealed structure includes a transition plate, on which an end cap and a sealing seat are respectively connected. Insulating plates are provided between the transition plate and the end cap, and between the transition plate and the sealing seat. Both the end cap and the sealing seat have through-holes for injecting glue. An injection groove is provided on the transition plate at the position corresponding to the injection hole. A sealing strip is provided on the outside of the injection groove. The insulating plate is interrupted at the area enclosed by the sealing strip. An annular insulating plate is connected to the side of the end cap and the sealing seat facing the transition plate, and the annular insulating plate covers the sealing strip.

[0007] This invention addresses the problem that insulation at sealing points is easily affected by the quality or impurities of the sealant. It addresses this by machining annular grooves at the corresponding sealing positions on the sealing seat and end cap, and embedding annular insulating plates. Since the annular insulating plates cover the sealing strip, the overlapping surfaces of the insulating plates and the annular insulating plates ensure a continuous insulation path, completely eliminating the influence of ferromagnetic impurities in the sealant. This achieves zero grounding without altering the original hydrogen sealing structure.

[0008] In a preferred embodiment of the present invention, the annular insulating plate is provided with a through hole, the inner diameter of which is the same as that of the glue injection hole, and the through hole coincides with the glue injection hole. The through hole on the annular insulating plate avoids covering the glue injection hole. The fact that the inner diameter of the through hole is the same as that of the glue injection hole ensures that the inner side of the annular insulating plate can completely cover the sealing strip.

[0009] As a preferred embodiment of the present invention, the end cap and the sealing seat are provided with an annular groove on the side facing the transition plate, and the annular insulating plate is disposed in the annular groove.

[0010] In a preferred embodiment of the present invention, the end cap and the sealing seat are respectively bonded to the insulating plate with epoxy adhesive and tightened with screws. The insulating plate of the present invention is bonded with epoxy adhesive and tightened with screws, thereby achieving a more reliable fixation of the insulating plate through a dual connection method.

[0011] In a preferred embodiment of the present invention, the annular insulating plate has a connecting hole, and the connecting hole of the annular insulating plate is connected to an end cap or a sealing seat by a screw. An insulating cover for covering the screw is provided inside the connecting hole of the annular insulating plate. The insulating cover covers the connecting screw of the annular insulating plate to ensure the continuity of the insulation path.

[0012] In a preferred embodiment of the present invention, the transition plate is provided with a mounting groove, and the sealing strip is disposed within the mounting groove. The area of ​​the insulating plate near the sealing strip is thinned, thereby causing the outer edge of the mounting groove to bulge, so as to better fix the sealing strip. The mounting groove protrudes from the surface of the transition plate, ensuring that the sealing strip can reliably seal the gaps between the transition plate and the end cap, and between the transition plate and the sealing seat. The mounting groove can reliably fix the sealing strip and prevent misalignment of the sealing strip.

[0013] In a preferred embodiment 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, ensuring reliable insulation.

[0014] In a preferred embodiment of the present invention, the end cap and the sealing seat are respectively connected to the transition plate by bolts.

[0015] In a preferred embodiment of the present invention, an insulating sleeve is fitted onto the threaded shaft of the engaging bolt, and insulating washers are respectively provided between the end cap and the sealing seat and the nut of the engaging bolt. Insulation at the engaging bolt location is achieved through the insulating sleeve and insulating washers, ensuring reliable insulation.

[0016] As a preferred embodiment of the present invention, the insulating plate, the insulating cylinder and the insulating washer are sequentially sealed and contacted end to end.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention addresses the problem that insulation at sealing points is easily affected by the quality or impurities of the sealant. It addresses this by machining annular grooves at the corresponding sealing positions on the sealing seat and end cap, and embedding annular insulating plates. Since the annular insulating plates cover the sealing strip, the overlapping surfaces of the insulating plates and the annular insulating plates ensure a continuous insulation path, completely eliminating the influence of ferromagnetic impurities in the sealant. This achieves zero grounding without altering the original hydrogen sealing structure. Attached Figure Description

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

[0020] Figure 2 This is a schematic diagram of the ring-shaped insulating plate fixing structure;

[0021] Figure 3 This is a schematic diagram of the structure of the present invention without the annular insulating plate;

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

[0023] Figure 5 This is a partial structural diagram of the present invention without the annular insulating plate.

[0024] In the diagram: 1-Transition plate; 2-End cap; 3-Sealing seat; 4-Insulating plate; 5-Injection hole; 6-Injection groove; 7-Sealing strip; 8-Annular insulating plate; 9-Screw; 10-Insulating cover; 11-Clamping bolt; 12-Insulating cylinder; 13-Insulating washer; 14-Washer. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0027] like Figures 1-5 As shown, the zero-ground fully sealed oil-sealed structure of this embodiment includes a transition plate 1, with an end cap 2 and a sealing seat 3 connected to the transition plate 1. An insulating plate 4 is provided between the transition plate 1 and the end cap 2, and between the transition plate 1 and the sealing seat 3. Both the end cap 2 and the sealing seat 3 are provided with through-hole glue injection holes 5. A glue injection groove 6 is provided on the transition plate 1 at the position corresponding to the glue injection hole 5. A sealing strip 7 is provided on the outside of the glue injection groove 6. The insulating plate 4 is disconnected at the area enclosed by the sealing strip 7. An annular insulating plate 8 is connected to the side of the end cap 2 and the sealing seat 3 facing the transition plate 1, and the annular insulating plate 8 covers the sealing strip 7.

[0028] This invention addresses the problem that insulation at sealing points is easily affected by the quality or impurities of the sealant. It addresses this by machining annular grooves at the corresponding sealing positions on the sealing seat 3 and end cap 2, into which annular insulating plates 8 are embedded. 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 ensure a continuous insulation path, completely eliminating the influence of ferromagnetic impurities in the sealant. This achieves zero grounding without altering the original hydrogen sealing structure.

[0029] Furthermore, the annular insulating plate 8 is provided with a through hole, the inner diameter of which is the same as that of the glue injection hole 5, and the through hole coincides with the glue injection hole 5. The annular insulating plate 8 is provided with a through hole to avoid covering the glue injection hole 5. The inner diameter of the through hole is the same as that of 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, the end cap 2 and the sealing seat 3 are provided with an annular groove on the side facing the transition plate 1, and the annular insulating plate 8 is disposed in the annular groove.

[0031] The end cap 2 and the sealing seat 3 are respectively bonded to the insulating plate 4 with epoxy adhesive and tightened with screws 9. The annular insulating plate 8 of the present invention is bonded with epoxy adhesive and tightened with screws 9, thereby making the insulating plate 4 more reliably fixed through a dual connection method.

[0032] The annular insulating plate 8 has a connecting hole, and the connecting hole of the annular insulating plate 8 is connected to the end cap 2 or the sealing seat 3 by a screw 9. An insulating cover 10 is provided in the connecting hole of the annular insulating plate 8 to cover the screw 9. The insulating cover 10 covers the connection between the annular insulating plate 8 and the screw 9 to ensure the continuity of the insulation path.

[0033] To facilitate the fixing of the sealing strip 7, the transition plate 1 is provided with an installation groove, and the sealing strip 7 is disposed in the installation groove. The installation groove protrudes from the surface of the transition plate 1, ensuring that the sealing strip 7 can reliably seal the gaps between the transition plate 1 and the end cap 2, and between the transition plate 1 and the sealing seat 3. The installation groove can reliably fix the sealing strip 7 and prevent the sealing strip 7 from being misaligned.

[0034] Furthermore, the area of ​​the insulating plate 4 near the sealing strip 7 is thinned, thereby causing the outer edge of the mounting groove to bulge out to better secure 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 and the insulating plate 4 overlap to ensure reliable insulation.

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

[0037] Furthermore, an insulating sleeve 12 is fitted onto the threaded shaft of the engaging bolt 11, and insulating washers 13 are respectively provided between the end cap 2 and the sealing seat 3 and the nut of the engaging bolt 11. At the engaging bolt 11, insulation is achieved at the engaging bolt 11 location through the insulating sleeve 12 and the insulating washer 13, ensuring reliable insulation.

[0038] The insulating plate 4, insulating cylinder 12, and insulating washer 13 are sequentially sealed in contact. Several washers 14 are also provided between the insulating washer 13 and the nut of the locking bolt 11.

[0039] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A zero-ground, fully sealed oil-sealed structure, characterized in that: The system includes a transition plate (1), on which an end cap (2) and a sealing seat (3) are connected respectively. An insulating plate (4) is provided between the transition plate (1) and the end cap (2) and between the transition plate (1) and the sealing seat (3). A through-hole (5) is provided on both the end cap (2) and the sealing seat (3). A glue injection groove (6) is provided on the transition plate (1) at the position corresponding to the glue injection hole (5). A sealing strip (7) is provided on the outside of the glue injection groove (6). The insulating plate (4) is broken at the area enclosed by the sealing strip (7). An annular insulating plate (8) is connected to the side of the end cap (2) and the sealing seat (3) facing the transition plate (1). The annular insulating plate (8) covers the sealing strip (7).

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

3. The zero-grounding fully sealed oil seal structure according to claim 1, characterized in that: The end cap (2) and the sealing seat (3) are provided with an annular groove on the side facing the transition plate (1), and the annular insulating plate (8) is disposed in the annular groove.

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

5. The zero-grounding fully sealed oil seal structure according to claim 4, characterized in that: The insulating plate (4) has a connection hole. The connection hole of the insulating plate (4) is connected to the end cap (2) or the sealing seat (3) by a screw (9). An insulating cover (10) is provided in the connection hole of the insulating plate (4) to cover the screw (9).

6. The zero-grounding fully sealed oil seal structure according to claim 1, characterized in that: The transition plate (1) is provided with an installation groove, and the sealing strip (7) is provided in the installation groove; the area of ​​the insulating plate (4) near the sealing strip (7) is thinned.

7. The zero-grounding 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-grounding fully sealed oil seal structure according to claim 1, characterized in that: The end cap (2) and the sealing seat (3) are respectively connected to the transition plate (1) by the connecting bolts (11).

9. A zero-grounding, fully sealed oil-sealing structure according to claim 8, characterized in that: An insulating sleeve (12) is fitted on the screw of the clamping bolt (11), and an insulating washer (13) is provided between the end cap (2) and the sealing seat (3) and the nut of the clamping bolt (11).

10. A zero-grounding, fully sealed oil-sealing structure according to claim 9, characterized in that: The insulating plate (4), insulating cylinder (12) and insulating gasket (13) are sealed and contacted end to end in sequence.

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