Zero-grounding fully-sealed oil sealing structure

Abstract

A zero-grounding fully-sealed oil sealing structure, relating to the technical field of turbogenerator oil sealing. The zero-grounding fully-sealed oil sealing structure comprises a transition plate; the transition plate is separately connected to an end cover and a sealing seat; insulating plates are respectively 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 each provided with a through adhesive injection hole; adhesive injection grooves are formed at the positions on the transition plate corresponding to the adhesive injection holes; a sealing strip is arranged on the outer side of each adhesive injection groove; each insulating plate is discontinuous at a region enclosed by the corresponding sealing strip; the side of the end cover facing the transition plate and the side of the sealing seat facing the transition plate are each connected to an annular insulating plate, and each annular insulating plate covers the corresponding sealing strip.

Description

Zero ground full-seal oil seal structure TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil seal of steam turbine generator, and particularly relates to a zero ground full-seal oil seal structure. BACKGROUND

[0002] As shown in Fig. 3, in order to facilitate online detection of generator oil seal insulation, considering the rigidity, the transition ring of the existing oil seal structure is respectively provided with a thin insulation plate between the end cover and the transition ring, and the two are combined together through bolts; as shown in Fig. 4, at the bolt combination position, insulation is realized through an insulation cylinder and an insulation washer.

[0003] As shown in Fig. 5, the double seal strip and the glue injection groove injection glue mode can realize triple seal. The disadvantage is that due to the size, compression amount and connection rigidity of the seal strip, the design distance between the transition ring and the end cover or the transition ring and the seal seat is relatively close, and when ferromagnetic impurities are mistakenly injected into the sealant injected by the glue injection groove, the component insulation is often unqualified, thereby affecting the safe operation of the generator or the on-site maintenance period. SUMMARY

[0004] In order to solve the above problems existing in the prior art, the purpose of the present application is to provide a zero ground full-seal oil seal structure.

[0005] The technical scheme adopted by the present application is:

[0006] A zero ground full-seal oil seal structure, comprising a transition plate, the transition plate is respectively connected with an end cover and a seal seat, an insulation plate is arranged between the transition plate and the end cover and between the transition plate and the seal seat, the end cover and the seal seat are both provided with a through glue injection hole, a glue injection groove is arranged on the transition plate corresponding to the position of the glue injection hole, a seal strip is arranged outside the glue injection groove, and the insulation plate is disconnected at the area surrounded by the seal strip; the side of the end cover and the seal seat facing the transition plate is both connected with an annular insulation plate, and the annular insulation plate covers the seal strip.

[0007] The present application is aimed at the problem that the insulation at the sealing position is easily affected by the quality of the sealant or impurities, and the annular groove is processed at the position of the seal member of the seal seat and the end cover, and the annular insulation plate is embedded. Since the annular insulation plate covers the seal strip, the overlapping of the lapping surface of the insulation plate and the annular insulation plate makes the insulation path continuous, so as to completely eliminate the influence of the ferromagnetic impurities in the sealant, thereby realizing zero ground without changing the original hydrogen seal structure.

[0008] As a preferred scheme of the present application, a through hole is arranged on the annular insulation plate, the inner diameter of the through hole is the same as that of the glue injection hole, and the through hole is coincided with the glue injection hole. The through hole is arranged on the annular insulation plate to avoid covering the glue injection hole. The inner diameter of the through hole is the same as that of the glue injection hole, so as to ensure that the inner side of the annular insulation plate can completely cover the seal strip.

[0009] As a preferred scheme of the present application, the end cover and the sealing seat are provided with annular grooves on the side facing the transition plate, and an annular insulation plate is arranged in the annular grooves.

[0010] As a preferred scheme of the present application, the end cover and the sealing seat are respectively connected with the insulation plate by epoxy bonding and screw tightening. The insulation plate is fixed more reliably by the double connection mode of epoxy bonding and screw tightening.

[0011] As a preferred scheme of the present application, the annular insulation plate is provided with a connecting hole, the annular insulation plate is connected with the end cover or the sealing seat by a screw at the connecting hole, and an insulation cover is arranged in the connecting hole of the annular insulation plate to cover the screw. The connecting hole of the annular insulation plate is covered by the insulation cover, so that the continuous insulation path is ensured.

[0012] As a preferred scheme of the present application, the transition plate is provided with a mounting groove, and a sealing strip is arranged in the mounting groove. The area of the insulation plate close to the sealing strip is thinned, so that the outer edge of the mounting groove is protruded to better fix the sealing strip. The mounting groove protrudes from the surface of the transition plate, so that the sealing strip can reliably seal the gap between the transition plate and the end cover and the gap 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 scheme of the present application, the outer edge of the annular insulation plate is aligned with the outer edge of the thinned area of the insulation plate. The annular insulation plate and the insulation plate are overlapped to ensure reliable insulation.

[0014] As a preferred scheme of the present application, the end cover and the sealing seat are respectively connected with the transition plate by a joint bolt.

[0015] As a preferred scheme of the present application, an insulation cylinder is sleeved on the screw rod of the joint bolt, and an insulation washer is arranged between the end cover and the sealing seat and the nut of the joint bolt. The insulation cylinder and the insulation washer are arranged at the joint bolt to ensure reliable insulation.

[0016] As a preferred scheme of the present application, the insulation plate, the insulation cylinder and the insulation washer are sequentially and tightly contacted.

[0017] The present application has the following beneficial effects:

[0018] The present application solves the problem that the insulation at the sealing position is easily affected by the quality or impurities of the sealing glue. The annular grooves are processed at the positions of the sealing parts of the sealing seat and the end cover, and the annular insulation plate is embedded. Since the annular insulation plate covers the sealing strip, the overlapping of the joint surface of the insulation plate and the annular insulation plate makes the insulation path continuous, so that the influence of the ferromagnetic impurities of the glue injection is completely eliminated, and the zero grounding is realized without changing the original hydrogen sealing structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a structural schematic diagram of the present application;

[0020] Fig. 2 is a schematic diagram of a ring-shaped insulation plate fixing structure;

[0021] Fig. 3 is a structural schematic diagram of the present application without a ring-shaped insulation plate;

[0022] Fig. 4 is a partial structural diagram of the present application;

[0023] Fig. 5 is a partial structural diagram of the present application without a ring-shaped insulation plate.

[0024] In the figures: 1 - transition plate; 2 - end cover; 3 - sealing seat; 4 - insulation plate; 5 - glue injection hole; 6 - glue injection groove; 7 - sealing strip; 8 - ring-shaped insulation plate; 9 - screw; 10 - insulation cover; 11 - joint bolt; 12 - insulation cylinder; 13 - insulation washer; 14 - washer. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0027] As shown in Figs. 1-5, the zero-ground full-sealing oil seal structure of the present embodiment comprises a transition plate 1, the transition plate 1 is connected with an end cover 2 and a sealing seat 3 respectively, an insulation 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, a glue injection hole 5 is arranged through the end cover 2 and the sealing seat 3, a glue injection groove 6 is arranged on the transition plate 1 corresponding to the position of the glue injection hole 5, a sealing strip 7 is arranged outside the glue injection groove 6, and the insulation plate 4 is disconnected at the area surrounded by the sealing strip 7; a ring-shaped insulation plate 8 is connected to the side of the end cover 2 and the sealing seat 3 facing the transition plate 1, and the ring-shaped insulation plate 8 covers the sealing strip 7.

[0028] The present application solves the problem that the insulation at the sealing position is affected by the quality or impurities of the sealing glue by processing an annular groove on the sealing seat 3 and the end cover 2 corresponding to the position of the sealing element and embedding the annular insulation plate 8. Since the annular insulation plate 8 covers the sealing strip 7, the overlapping surface of the insulation plate 4 and the annular insulation plate 8 is overlapped, the insulation path is continuous, the influence of the ferromagnetic impurities of the glue injection is completely eliminated, and the zero grounding is realized without changing the original hydrogen sealing structure.

[0029] Further, the annular insulation plate 8 is provided with a through hole, the inner diameter of the through hole is the same as that of the glue injection hole 5, and the through hole is coincided with the glue injection hole 5. The through hole is provided on the annular insulation plate 8 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, so that the inner side of the annular insulation plate 8 can completely cover the sealing strip 7.

[0030] Specifically, the end cover 2 and the sealing seat 3 are provided with annular grooves on the side facing the transition plate 1, and the annular insulation plate 8 is arranged in the annular grooves.

[0031] The end cover 2 and the sealing seat 3 are respectively connected with the insulation plate 4 by epoxy adhesive and screwed by the screw 9. The annular insulation plate 8 of the present application is connected by epoxy adhesive and screwed by the screw 9, so that the insulation plate 4 is fixed more reliably by the double connection mode.

[0032] The connecting hole is provided on the annular insulation plate 8, the connecting hole of the annular insulation plate 8 is connected with the end cover 2 or the sealing seat 3 by the screw 9, and the insulating cover 10 is arranged in the connecting hole of the annular insulation plate 8 to cover the screw 9. The connecting hole of the annular insulation plate 8 is covered by the insulating cover 10 to ensure the continuity of the insulation path.

[0033] In order to facilitate the fixation of the sealing strip 7, the 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 to ensure that the sealing strip 7 can reliably seal the gap between the transition plate 1 and the end cover 2 and the gap between the transition plate 1 and the sealing seat 3. The mounting groove can reliably fix the sealing strip 7 to avoid the dislocation of the sealing strip 7.

[0034] Further, the area of the insulation plate 4 close to the sealing strip 7 is thinned, so that the outer edge of the mounting groove is protruded to better fix the sealing strip 7.

[0035] The outer edge of the annular insulation plate 8 is aligned with the outer edge of the thinned area of the insulation plate 4. The annular insulation plate 8 and the insulation plate 4 are overlapped to ensure reliable insulation.

[0036] Specifically, the end cover 2 and the sealing seat 3 are respectively connected with the transition plate 1 by the joint bolt 11.

[0037] Further, the screw rod of the screw bolt 11 is sleeved with an insulating cylinder 12, and insulating washers 13 are arranged between the end cover 2 and the sealing seat 3 and the screw nut of the screw bolt 11. The insulating cylinder 12 and the insulating washers 13 realize insulation at the position of the screw bolt 11, thereby ensuring reliable insulation.

[0038] The insulating plate 4, the insulating cylinder 12 and the insulating washers 13 are in contact in sequence.

[0039] The present application is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any change in shape or structure, any technical solution falling within the scope defined by the claims of the present application falls within the protection scope of the present application.

Claims

1. A zero ground totally enclosed oil sealed construction characterized by: The utility model provides a transition plate (1) is connected with end cover (2) and sealing seat (3) respectively, and the transition plate (1) and end cover (2) between, transition plate (1) and sealing seat (3) between all be provided with insulating plate (4), and end cover (2) and sealing seat (3) all be provided with through injection hole (5), and the transition plate (1) is provided with injection groove (6) in the position corresponding injection hole (5), and the outside of injection groove (6) is provided with sealing strip (7), and insulating plate (4) is disconnected at the area surrounded by sealing strip (7);The side of end cover (2) and sealing seat (3) towards transition plate (1) all are connected with annular insulating plate (8), and annular insulating plate (8) covers sealing strip (7).

2. A zero ground totally enclosed oil seal arrangement according to claim 1, wherein: The annular insulating plate (8) is provided with a through hole, the inner diameter of the through hole is the same as the injection hole (5), and the through hole coincides with the injection hole (5).

3. A zero ground totally enclosed oil seal arrangement according to claim 1 wherein: The side of end cover (2) and sealing seat (3) towards transition plate (1) is provided with a ring groove, and the annular insulating plate (8) is arranged in the ring groove.

4. A zero ground totally enclosed oil seal construction according to claim 1 wherein: The end cover (2) and the sealing seat (3) are respectively connected with the insulating plate (4) by epoxy adhesive and screw (9) tightening.

5. A zero ground totally enclosed oil seal construction according to claim 4 wherein: The insulating plate (4) is provided with a connecting hole, and the connecting hole of the insulating plate (4) is connected with the end cover (2) or the sealing seat (3) by the screw (9), and the connecting hole of the insulating plate (4) is provided with an insulating cover (10) for covering the screw (9).

6. A zero ground totally enclosed oil seal construction according to claim 1 wherein: The transition plate (1) is provided with a mounting groove, and the sealing strip (7) is arranged in the mounting groove.

7. A zero ground totally enclosed oil seal construction according to claim 6 wherein: The outer edge of the annular insulating plate (8) is aligned with the outer edge of the thinned area of the insulating plate (4).

8. A zero ground totally enclosed oil seal construction according to claim 1 wherein: The end cover (2) and the sealing seat (3) are respectively connected with the transition plate (1) by the joint bolt (11).

9. A zero ground totally enclosed oil seal construction according to claim 8 wherein: The screw rod of the joint bolt (11) is provided with an insulating cylinder (12), and the end cover (2) and the sealing seat (3) are respectively provided with an insulating washer (13) between the screw cap of the joint bolt (11).

10. A zero ground totally enclosed oil seal construction according to claim 9 wherein: The insulating plate (4), the insulating cylinder (12) and the insulating washer (13) are sequentially and sealingly contacted.

Images