Ring sealing structure and vacuum arc-extinguishing chamber

Abstract

The utility model discloses a ring sealing structure and a vacuum arc-extinguishing chamber, the ring sealing structure comprises a copper transition ring, an inner voltage-sharing shielding cover and an outer voltage-sharing shielding cover, the copper transition ring is provided with a connecting groove, the bottom of the connecting groove is welded with the end part of a shielding shell, and the back surface of the bottom of the connecting groove is welded with a ceramic shell; the inner voltage-sharing shielding case is positioned on the inner side of the porcelain shell and is welded with the inner side of the copper transition ring; and the outer voltage-sharing shielding case is positioned on the outer side of the porcelain shell and is welded with the outer side of the copper transition ring. The vacuum arc-extinguishing chamber comprises the ring sealing structure. The beneficial effects of the utility model are that through forming the four welding points with balanced positions, compared with the mode that a shielding case is only suspended inside, the external voltage-sharing shielding case is also arranged, so that the force arm of the moving end is lengthened, the moving end and the static end at the sealing structure are balanced, the sealing stress at the sealing structure is further reduced, and the service life of the sealing structure is prolonged. And the failure of the 252kV high-voltage-class arc extinguish chamber caused by overlarge sealing stress is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technology of vacuum arc-extinguishing chamber structure, specifically relates to a ring seal joint structure and vacuum arc-extinguishing chamber. BACKGROUND

[0002] Generally, the vacuum arc-extinguishing chamber needs to be sealed by ceramic and metal, and generally, the length of the ceramic shell is increased to increase the external insulation, or the internal metal shielding cover is increased to enhance the internal insulation, thereby playing the role of voltage equalization shielding. For medium and high voltage vacuum arc-extinguishing chambers, copper sealing rings are used to realize the welding of the transition position of metal and ceramic.

[0003] The overall size of the vacuum arc-extinguishing chamber increases with the increase of voltage (10kV-252kV), and the corresponding part size also becomes larger and larger, and the sealing stress generated is also larger and larger, but the allowable value of the material stress resistance is fixed, and the increase of the sealing stress will cause the vacuum degree of the vacuum arc-extinguishing chamber to fail, thereby causing the arc-extinguishing chamber to lose insulation and breaking capacity.

[0004] At present, the sealing structure of the 72.5kV-126kV high-voltage arc-extinguishing chamber adopts a structure of copper sealing ring + internal suspension stainless steel shielding cover, and since only the internal suspension stainless steel shielding cover is provided, the suspension is asymmetric, which causes the dynamic end sealing stress to be significantly greater than the static end. In addition, the force arm of the static end is longer and the force arm of the dynamic end is shorter, which causes the sealing stress of the vacuum arc-extinguishing chamber to be large. Therefore, when the above asymmetric structure is applied to the 252kV high-voltage level vacuum arc-extinguishing chamber, the sealing stress is larger, which will cause the 252kV high-voltage level arc-extinguishing chamber to fail. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is that the sealing stress of the existing asymmetric sealing structure applied to the 252kV high-voltage level vacuum arc-extinguishing chamber is extremely large, which will cause the 252kV high-voltage level arc-extinguishing chamber to fail. The purpose is to provide a ring sealing structure and a vacuum arc-extinguishing chamber. The inner side of the inner voltage equalization shielding cover and the copper transition ring is welded, and the outer side of the outer voltage equalization shielding cover and the copper transition ring is welded, so that the dynamic end and the static end of the sealing structure are balanced, thereby reducing the sealing stress of the sealing structure, and preventing the 252kV high-voltage level arc-extinguishing chamber from failing due to excessive sealing stress.

[0006] The utility model realizes the following technical scheme:

[0007] A ring-sealing structure includes a copper transition ring, an inner equalizing shield, and an outer equalizing shield. The copper transition ring has a connecting groove, the bottom of which is welded to the end of the shield shell, and the back side of the bottom of the connecting groove is welded to a ceramic shell. The inner equalizing shield is located inside the ceramic shell and is welded to the inner side of the copper transition ring. The outer equalizing shield is located outside the ceramic shell and is welded to the outer side of the copper transition ring.

[0008] The beneficial effect of this utility model is that, since the insulation margin of the 252kV high-voltage arc-extinguishing chamber is further narrowed compared to the low-voltage insulation margin, the equalization of voltage at each position becomes very critical. To this end, a connecting groove is provided on the copper transition ring, and the bottom of the connecting groove is welded to the end of the shield shell. The back of the bottom of the connecting groove is welded to the ceramic shell. The inner equalization shield is welded to the inner side of the copper transition ring, and the outer equalization shield is welded to the outer side of the copper transition ring, forming four welding points in a balanced position. Compared with only the internal suspension shield, an outer equalization shield is also provided, which lengthens the moving end lever arm, so that the moving end and the stationary end at the sealing structure are balanced, thereby reducing the sealing stress at the sealing structure and preventing the 252kV high-voltage arc-extinguishing chamber from failing due to excessive sealing stress.

[0009] In some embodiments, the copper transition ring is generally circular, the connecting groove is generally annular, and the cross-section of the connecting groove is U-shaped. The inner and outer equalizing shields are welded to the two free ends of the U-shape, respectively. By setting the cross-section of the connecting groove to U-shape and welding the inner and outer equalizing shields to the two free ends of the U-shape, the U-shaped groove effectively stores the solder penetrating the connection between the copper transition ring and the ceramic shell, thereby reducing the risk of leakage. Furthermore, by setting the groove, the thickness of the copper transition ring is reduced, thereby further reducing and releasing the sealing stress at the connection between the copper transition ring and the ceramic shell.

[0010] In some embodiments, the copper transition ring is provided with two inclined portions located outside the connecting groove. The inclined portions gradually slope from the top where the copper transition ring is welded to the ceramic shell to the outside of the connecting groove. By providing two inclined portions, the contact area between the copper transition ring and the ceramic shell is reduced, further reducing the stress at the sealing joint.

[0011] In some embodiments, a first and second sink are provided on a sidewall of the connecting groove, the first and second sinks are respectively located on an inner side and an outer side of the connecting groove, the second sink is located at a lower end of the inclined portion, the first and second sinks are parallel and are both located on the sidewall where the copper transition ring is connected to the inner equalizing shield, and the first and second sinks form a transverse force arm. By providing the first and second sinks on the sidewall where the copper transition ring is connected to the inner equalizing shield, the thickness of the sidewall of the connecting groove is reduced, and the stress of the copper transition ring is reduced.

[0012] In some embodiments, an inclined surface is provided on an inner side of the connecting groove, the inclined surface is located on a side where the copper transition ring is connected to the outer equalizing shield, the inclined surface extends from a middle portion of the sidewall to a free end of the sidewall and is inclined along an outer side of the sidewall. By providing the inclined surface on the inner side of the connecting groove, the thickness of the connecting groove is further reduced, and the stress of the copper transition ring is further reduced.

[0013] In some embodiments, an outer equalizing shield connecting portion is provided on an end of the outer equalizing shield where the outer equalizing shield is connected to the copper transition ring, the outer equalizing shield connecting portion is in the shape of a whole annular plate, and the outer equalizing shield connecting portion is lap-welded with the connecting sink. By providing the connecting sink, the thickness of the copper transition ring is reduced, and the stress of the copper transition ring is further reduced.

[0014] In some embodiments, an outer equalizing shield bending portion is provided on an end of the outer equalizing shield away from the outer equalizing shield connecting portion, the outer equalizing shield bending portion is in the shape of a circular arc, and the circular arc is curved towards the outer equalizing shield. By providing the outer equalizing shield bending portion on the outer equalizing shield, the outer equalizing shield bending portion increases the radius of curvature of the outer equalizing shield connecting portion, thereby reducing the electric field intensity of the vacuum interrupter and playing a role of equalizing shield.

[0015] In some embodiments, the inner equalizing shield is in the shape of a whole cylinder, an inner equalizing shield connecting portion is provided on an end of the inner equalizing shield, and the inner equalizing shield connecting portion is lap-welded with an inner side of the copper transition ring.

[0016] In some embodiments, an inner equalizing shield bending portion is provided on an end of the inner equalizing shield away from the inner equalizing shield connecting portion, the inner equalizing shield bending portion is in the shape of a circular arc, and the circular arc is curved towards the inner equalizing shield. By providing the inner equalizing shield bending portion on the inner equalizing shield, the inner equalizing shield bending portion increases the radius of curvature of the inner equalizing shield connecting portion, thereby reducing the electric field intensity of the vacuum interrupter and playing a role of equalizing shield.

[0017] The utility model also provides a vacuum arc-extinguishing chamber, including the ring seal joint structure of above.

[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0019] 1、 through forming four welding points of position balance, still be provided with the outer equalizing shield of only inside hanging shield, lengthen the dynamic end force arm, make the dynamic end and static end of seal joint structure place balance, further reduce the seal joint stress of seal joint structure place, prevent 252kV high voltage grade arc-extinguishing chamber from losing effectiveness because of too large seal joint stress.

[0020] 2、 through setting up two inclined portions, reduce the contact area of copper transition ring and porcelain shell welding, further reduce the stress of seal joint place.

[0021] 3、 through setting up first sunken platform and second sunken platform on the side wall of copper transition ring and inner equalizing shield connection, reduce the thickness of connecting groove side wall, reduce the stress of copper transition ring.

[0022] 4、 the outer shield bending part and inner shield bending part are set up on the outer equalizing shield and inner equalizing shield respectively, the curvature radius of outer equalizing shield and inner equalizing shield is increased respectively, thereby the electric field intensity of vacuum arc-extinguishing chamber is reduced, and the effect of equalizing shield is played. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the embodiments of the utility model, and form part of the present application, and do not constitute limitation to the embodiments of the utility model.

[0024] Figure 1 It is the central section view of the utility model;

[0025] Figure 2 It is the central section view of copper transition ring in the utility model;

[0026] Figure 3 It is the central section view of inner equalizing shield in the utility model;

[0027] Figure 4 It is the central section view of inner equalizing shield in the utility model;

[0028] Figure 5 It is the central section view of the utility model Figure 1 K part of the utility model is the enlarged view.

[0029] Mark and corresponding part name in the drawings:

[0030] Shielding shell 10, copper transition ring 20, connecting groove 21, first sink 22, second sink 23, inclined part 24, porcelain shell 30, inner equalizing shielding cover 40, inner shielding connecting part 41, inner shielding bending part 42, outer equalizing shielding cover 50, outer shielding connecting part 51, outer shielding bending part 52. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will combine with examples and drawings to make further detailed description to the utility model, the schematic implementation mode and the description of the utility model are only used to explain the utility model, and do not serve as the limitation to the utility model.

[0032] In the whole specification, the mention of "one embodiment", "embodiment", "one example" or "example" means that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the utility model. Therefore, the phrases "one embodiment", "embodiment", "one example" or "example" appearing in various places in the whole specification do not necessarily refer to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in one or more embodiments or examples in any appropriate combination and / or subcombination. In addition, those skilled in the art should understand that the diagrams provided herein are for illustrative purposes, and the diagrams are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] In the description of the utility model, the orientation or position relationship indicated by the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the protection scope of the utility model.

[0034] The terms "first", "second" and the like used in the utility model are only for the sake of clear description of corresponding components, and do not aim to limit any order or emphasize importance. In addition, the term "connection" used in this paper can be direct connection or indirect connection via other components without special description.

[0035] Example 1

[0036] This embodiment 1 provides a ring seal structure, referring to Figures 1-5, including copper transition ring 20, inner equalization shield 40 and outer equalization shield 50, the copper transition ring 20 is provided with a connecting groove 21, the bottom of the connecting groove 21 is welded with the end of the shield shell 10, the back of the bottom of the connecting groove 21 is welded with the porcelain shell 30; the inner equalization shield 40 is located at the inner side of the porcelain shell 30 and is welded with the inner side of the copper transition ring 20; the outer equalization shield 50 is located at the outer side of the porcelain shell 30 and is welded with the outer side of the copper transition ring 20. By forming four welding points in a balanced position, compared with the basis of only suspending the inner shield, the outer equalization shield 50 is also provided, the dynamic end force arm is lengthened, the dynamic end and the static end at the sealing structure are balanced, and then the sealing stress at the sealing structure is reduced, preventing the 252kV high voltage grade arc-extinguishing chamber from failing due to excessive sealing stress.

[0037] Referring to Figure 1 and Figure 2 , the copper transition ring 20 is in the shape of a whole ring, the connecting groove 21 is in the shape of a whole ring groove, the cross section of the connecting groove 21 is in the shape of a few characters, and the inner equalization shield 40 and the outer equalization shield 50 are respectively welded with the two free ends of the few characters. By setting the cross section of the connecting groove 21 in the shape of a few characters and welding the inner equalization shield 40 and the outer equalization shield 50 with the two free ends of the few characters, the few character grooves effectively store the penetrating solder connecting the copper transition ring 20 and the porcelain shell 30, thereby reducing the risk of gas leakage, and by setting the grooves, the thickness of the copper transition ring 20 is reduced, thereby further reducing and releasing the sealing stress of the copper transition ring 20 and the porcelain shell 30.

[0038] Referring to Figure 1 and Figure 2 , the copper transition ring 20 is provided with two inclined portions 24, the inclined portions 24 are located at the outer side of the connecting groove 21, and the inclined portions 24 gradually incline from the top of the copper transition ring 20 welded with the porcelain shell 30 to the outer side of the connecting groove 21. By setting two inclined portions 24, the contact area of the copper transition ring 20 and the porcelain shell 30 is reduced, and the stress at the sealing position is further reduced.

[0039] Referring to Figure 1 and Figure 4, one side wall of the connecting groove 21 is provided with a first sunken platform 22 and a second sunken platform 23, the first sunken platform 22 and the second sunken platform 23 are respectively located at the inner side and the outer side of the connecting groove 21, the second sunken platform 23 is located at the lower end of the inclined part 24, the first sunken platform 22 and the second sunken platform 23 are parallel and are both located on the side wall where the copper transition ring 20 is connected with the inner equalizing shield 40, the first sunken platform 22 and the second sunken platform 23 form a transverse force arm. By providing the first sunken platform 22 and the second sunken platform 23 on the side wall where the copper transition ring 20 is connected with the inner equalizing shield 40, the thickness of the side wall of the connecting groove 21 is reduced, and the stress of the copper transition ring 20 is reduced.

[0040] Referring to Figure 1 and Figure 5 , an inclined surface is arranged on the inner side of the connecting groove 21, the inclined surface is located on the side where the copper transition ring 20 is connected with the outer equalizing shield 50, the inclined surface is from the middle of the side wall to the free end of the side wall and is inclined along the outer side of the side wall. By arranging the inclined surface on the inner side of the connecting groove 21, the thickness of the connecting groove 21 is further reduced, and the stress of the copper transition ring 20 is further reduced.

[0041] Referring to Figure 1 and Figure 5 , the outer side of the copper transition ring 20 is provided with a connecting sunken platform, one end of the outer equalizing shield 50 where the outer equalizing shield 50 is connected with the copper transition ring 20 is provided with an outer shield connecting part 51, the outer shield connecting part 51 is in the shape of a whole annular plate, and the outer shield connecting part 51 is lap-welded with the connecting sunken platform. By arranging the connecting sunken platform, the thickness of the copper transition ring 20 is reduced, and the stress of the copper transition ring 20 is further reduced.

[0042] Referring to Figure 1 and Figure 3 , one end of the outer equalizing shield 50 away from the outer shield connecting part 51 is provided with an outer shield bending part 52, the cross section of the outer shield bending part 52 is in the shape of a circular arc, and the circular arc is bent towards the outer equalizing shield 50. By arranging the outer shield bending part 52 on the outer equalizing shield 50, the outer shield bending part 52 increases the radius of curvature of the outer shield connecting part 51, thereby reducing the electric field intensity of the vacuum interrupter and playing a role of equalizing shield.

[0043] Referring to Figure 1 and Figure 4 , the inner equalizing shield 40 is in the shape of a whole cylinder, one end of the inner equalizing shield 40 is provided with an inner shield connecting part 41, and the inner shield connecting part 41 is lap-welded with the inner side of the copper transition ring 20.

[0044] Referring to Figure 1 and Figure 4The inner equalizing shielding cover 40 is provided with an inner shielding bending part 42 at one end away from the inner shielding connecting part 41, the cross section of the inner shielding bending part 42 is in a circular arc shape, and the circular arc shape is bent towards the inner equalizing shielding cover 40. By providing the inner equalizing shielding cover 40 with the inner shielding bending part 42, the inner shielding bending part 42 increases the radius of curvature of the inner shielding connecting part 41, thereby reducing the electric field intensity of the vacuum arc-extinguishing chamber and playing the role of equalizing shielding.

[0045] Embodiment 2

[0046] The embodiment 2 provides a vacuum arc-extinguishing chamber comprising the ring sealing joint structure. By providing the ring sealing joint structure, the sealing stress at the sealing joint is released, and the quality of the vacuum arc-extinguishing chamber is improved.

[0047] The above detailed description is further used to explain the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only the specific implementation of the utility model and is not used to limit the protection scope of the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A ring seal structure, characterized by, The application relates to a ring seal structure, which comprises the following parts: a copper transition ring, which is provided with a connecting groove, the bottom of the connecting groove is welded with the end of a shielding shell, and the back of the bottom of the connecting groove is welded with a porcelain shell; an inner equal-pressure shielding cover, which is located at the inner side of the porcelain shell and is welded with the inner side of the copper transition ring; an outer equal-pressure shielding cover, which is located at the outer side of the porcelain shell and is welded with the outer side of the copper transition ring.

2. The ring seal structure according to claim 1, wherein The copper transition ring is in the shape of a whole ring, the connecting groove is in the shape of a whole annular groove, the cross section of the connecting groove is in the shape of a Chinese character 'er', and the inner equal-pressure shielding cover and the outer equal-pressure shielding cover are respectively welded with the two free ends of the Chinese character 'er'.

3. The ring seal structure according to claim 2, wherein The copper transition ring is provided with two inclined parts, which are located at the outer side of the connecting groove and gradually incline from the top of the copper transition ring welded with the porcelain shell to the outer side of the connecting groove.

4. The ring seal structure according to claim 3, wherein The side wall of the connecting groove is provided with a first sunken platform and a second sunken platform, the first sunken platform and the second sunken platform are respectively located at the inner side and the outer side of the connecting groove, the second sunken platform is located at the lower end of the inclined part, and the first sunken platform and the second sunken platform are parallel and are located on the side wall connected with the inner equal-pressure shielding cover.

5. The ring seal structure according to claim 3, wherein The inner side wall of the connecting groove is provided with an inclined surface, which is located at the side connected with the outer equal-pressure shielding cover, and the inclined surface inclines from the middle of the inner side wall to the free end of the inner side wall and along the outer side of the inner side wall.

6. The ring seal structure of claim 1, wherein The outer side of the copper transition ring is provided with a connecting sunken platform, one end of the outer equal-pressure shielding cover connected with the copper transition ring is provided with an outer shielding connecting part, the outer shielding connecting part is in the shape of a whole annular plate, and the outer shielding connecting part is lap-welded with the connecting sunken platform.

7. The ring seal structure according to claim 6, wherein One end of the outer equal-pressure shielding cover away from the outer shielding connecting part is provided with an outer shielding curved part, the cross section of the outer shielding curved part is in the shape of a circular arc, and the circular arc is curved towards the outer equal-pressure shielding cover.

8. The ring seal structure of claim 1, wherein The inner equal-pressure shielding cover is in the shape of a whole cylinder, one end of the inner equal-pressure shielding cover is provided with an inner shielding connecting part, and the inner shielding connecting part is lap-welded with the inner side of the copper transition ring.

9. The ring seal structure according to claim 8, wherein One end of the inner equal-pressure shielding cover away from the inner shielding connecting part is provided with an inner shielding curved part, the cross section of the inner shielding curved part is in the shape of a circular arc, and the circular arc is curved towards the inner equal-pressure shielding cover.

10. A vacuum interrupter, characterized by The ring seal structure is characterized in that any one of claims 1-9 is comprised.

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