Vacuum arc-extinguishing chamber for air-insulated ring main unit and air-insulated ring main unit

Abstract

The utility model provides a vacuum arc extinguish chamber used for an air insulation ring main unit and the air insulation ring main unit, the vacuum arc extinguish chamber used for the air insulation ring main unit comprises an insulation housing, a moving end portion and a static end portion, the moving end portion and the static end portion are assembled on the insulation housing, and the insulation housing comprises a ceramic housing. An umbrella skirt structure is integrally formed on the peripheral side of the ceramic shell; the umbrella skirt structure is composed of a plurality of annular protrusions which are arranged at intervals in the length direction of the ceramic shell. When the vacuum arc-extinguishing chamber is applied to the air insulation ring main unit, the creepage distance can be effectively increased, an original rubber coating vacuum arc-extinguishing chamber is replaced, the cost required by rubber coating is reduced, meanwhile, the thickness of a rubber layer is reduced, and under the condition that it is ensured that the appearance of the vacuum arc-extinguishing chamber meets the requirement, the internal insulation gap of a product is increased, so that the overall insulation performance of the product is also improved.

Description

Technical Field

[0001] The utility model relates to the field of switch cabinets, in particular to the field of air-insulated ring network cabinets, and further relates to a vacuum interrupter chamber for air-insulated ring network cabinets and an air-insulated ring network cabinet. Background Art

[0002] Air insulated ring main unit is a new type of high-voltage switchgear. It uses environmentally friendly gases such as dry air and nitrogen as insulating media. Its insulation and arc extinguishing performance are better than SF6 gas. It is a pollution-free insulating medium with good insulation performance and environmental protection characteristics. It is a 10kV high-voltage switchgear. The existing technology is to encapsulate the vacuum interrupter with rubber to enhance the product insulation, and then assemble the encapsulated vacuum interrupter on the air insulated ring main unit to ensure the product performance.

[0003] There are several disadvantages in using rubber-coated vacuum interrupters: ① The existing vacuum interrupters need to add a rubber-coating process, which increases the cost; ② Since the existing vacuum interrupters need to be rubber-coated, the outer diameter of the rubber layer is increased, so the shape of the vacuum interrupter before rubber-coating needs to be limited, which leads to internal gap restrictions and limited insulation performance in the vacuum interrupter; ③ The insulation outside the vacuum interrupter has high requirements on the qualified rate of rubber-coating and the material and cleanliness of the insulating glue; the qualified rate of the rubber-coating process is not high, and unqualified products will affect product performance; ④ The medium-voltage environmental protection cabinet currently uses miniaturized products, which have relatively high requirements on the insulation and voltage resistance of the products. The use of rubber-coating and solid sealing technology has high requirements on the external insulation and the compatibility of the insulating glue with ceramics, and the product has the risk of breakdown. Utility Model Content

[0004] To this end, the utility model provides a vacuum interrupter for an air-insulated ring main unit; another vacuum interrupter structure is adopted to replace the rubber-coated vacuum interrupter, and is used in the air-insulated ring main unit to reduce the above-mentioned problems.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A vacuum arc extinguishing chamber for an air-insulated ring network cabinet comprises an insulating shell and a moving end portion and a static end portion assembled on the insulating shell, wherein the insulating shell comprises a ceramic shell, and an shed structure is integrally formed on the outer peripheral side of the ceramic shell; the shed structure is a plurality of annular protrusions arranged at intervals along the length direction of the ceramic shell.

[0007] Furthermore, the outer surface of the annular protrusion is an arc-shaped surface.

[0008] Furthermore, the protrusion ends of the plurality of annular protrusions are flush with each other.

[0009] Furthermore, the upper and lower ends of the ceramic shell are respectively provided with openings, and the insulating shell also includes an upper cover plate and a lower cover plate, the upper cover plate covers the upper opening of the ceramic shell, and the lower cover plate covers the lower opening of the ceramic shell, and the ceramic shell, the upper cover plate and the lower cover plate participate in enclosing and forming a closed chamber, and the moving end part and the static end part both have contacts located in the closed chamber, and the moving contact of the moving end part corresponds to the static contact of the static end part.

[0010] Furthermore, a shielding cylinder is also provided in the sealed chamber of the insulating shell, and the moving contact of the moving end part and the static contact of the static end part are located in the shielding cylinder.

[0011] Furthermore, the shielding tube is fixed to the inner wall of the ceramic shell by welding, and the outer wall position of the ceramic shell corresponding to the welding point is an annular protrusion.

[0012] Furthermore, the inner wall of the ceramic shell has an abutting step, and the shielding tube abuts against the abutting step and is fixed by welding.

[0013] Furthermore, the moving end portion includes a moving contact assembled in an insulating housing and a moving conductive rod connected to the moving contact and extending outside the insulating housing.

[0014] Furthermore, the static end portion includes a static contact assembled in the insulating housing and a static end terminal socket connected to the static contact and extending outside the insulating housing.

[0015] An air-insulated ring main unit at least comprises the vacuum interrupter chamber used for the air-insulated ring main unit described above.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] In the air-insulated ring network cabinet, the dry air environment has greater insulation performance requirements than the traditional SF6 gas environment. This application designs the vacuum interrupter in the air-insulated ring network cabinet with a ceramic shell with an umbrella skirt structure, which can effectively increase the creepage distance, replace the original rubber-coated vacuum interrupter, reduce the cost required for rubber coating, and reduce the thickness of the rubber layer. While ensuring that the outer shape of the vacuum interrupter meets the requirements, the internal insulation gap of the product is increased, so that the overall insulation performance of the product is also improved. It can well reduce the problems existing in the prior art of using rubber-coated vacuum interrupters.

[0018] Under the insulation conditions and placement space limitations of the air-insulated ring main unit itself, there are more stringent requirements on the internal space environment structure and product parts of the air-insulated ring main unit. Compared with the traditional rubber-coated vacuum arc chamber in the background technology, the product of this solution has more superior insulation stability under the conditions of miniaturization and simpler production process, and also reduces the probability of product breakdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure shows the appearance of the vacuum interrupter used in the air-insulated ring main unit in the embodiment;

[0020] Figure 2 Shown Figure 1 a top view of the structure shown;

[0021] Figure 3 Shown Figure 2 Section view along line AA. DETAILED DESCRIPTION

[0022] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0024] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0025] Reference Figures 1 to 3 As shown, a vacuum interrupter for an air-insulated ring main unit provided in this embodiment includes an insulating housing 10 and a moving end portion and a static end portion assembled on the insulating housing 10, wherein the insulating housing 10 includes a ceramic housing 11, and an shed structure is integrally formed on the outer peripheral side of the ceramic housing 11. Specifically, in this embodiment, the shed structure is a plurality of annular protrusions 111 arranged at intervals along the length direction of the ceramic housing 11. The setting of the shed structure can effectively increase the creepage distance.

[0026] This embodiment also provides an air-insulated ring main unit, which at least includes the vacuum interrupter for the air-insulated ring main unit described above. The vacuum interrupter for the air-insulated ring main unit described above is adopted, and its insulating shell 10 has a ceramic shell 11 with an umbrella skirt structure, which can effectively increase the creepage distance, replace the original rubber-coated vacuum interrupter, reduce the cost required for rubber coating, and reduce the thickness of the rubber layer. While ensuring that the outer shape of the vacuum interrupter meets the requirements, the internal insulation gap of the product is increased, that is, the internal closed chamber 101 is enlarged, the component layout space in the closed chamber 101 is sufficient, and the insulation gap is large, so that the overall insulation performance of the product is also improved. It can be better applied to air-insulated ring main units.

[0027] The air-insulated ring network cabinet is mostly used in towns and cities, and the internal space is limited. Under the insulation conditions and placement space limitations of the air-insulated ring network cabinet itself, there are more stringent requirements for the internal space environment structure and product parts of the air-insulated ring network cabinet. Compared with the traditional rubber-encapsulated vacuum arc chamber in the background technology, the umbrella skirt structure integrally formed on the outer peripheral side of the ceramic shell 11 of the product of this solution effectively increases the creepage distance, has good insulation stability, and increases the internal insulation gap of the product while ensuring that the outer shape of the vacuum arc chamber meets the requirements, reducing the probability of product breakdown. That is, it has more superior insulation stability under the conditions of miniaturization and simpler production process, and also reduces the probability of product breakdown.

[0028] Specifically, in this embodiment, the outer surface of the annular protrusion 111 is an arcuate surface, so that the outer surface of the ceramic shell 11 forms a corrugated shape; the arcuate surface can effectively prevent the occurrence of tip discharge. At the same time, the protruding ends of multiple annular protrusions 111 are flush with each other to effectively control the volume. Such an arrangement further improves the insulation performance. Of course, in other embodiments, the outer surface of the annular protrusion 111 may not adopt an arcuate surface, or the protruding ends of multiple annular protrusions 111 may not be flush, such as the protruding height of the middle annular protrusion 111 is high, and the protruding height of the annular protrusions 111 at both ends is low.

[0029] Specifically, in this embodiment, the upper and lower ends of the ceramic shell 11 are respectively provided with openings, and the insulating shell 10 also includes an upper cover plate 12 and a lower cover plate 13, the upper cover plate 12 covers the upper opening of the ceramic shell 11, and the lower cover plate 13 covers the lower opening of the ceramic shell 11, and the ceramic shell 11, the upper cover plate 12 and the lower cover plate 13 participate in the enclosure to form a closed chamber 101 to achieve a vacuum environment. Specifically, in this embodiment, other parts participate in the enclosure to form the closed chamber 101, such as the end cover 51, the bellows 52, the wave screen cover 53 and other parts are also used to enclose the closed chamber 101, and the specific connection method is the existing technology and will not be described in detail here. Of course, in other embodiments, the ceramic shell 11, the upper cover plate 12 and the lower cover plate 13 can also be directly used to enclose the closed chamber.

[0030] The moving end part and the static end part both have contacts located in the closed chamber. Specifically, in the present embodiment, the moving end part includes a moving contact assembled in the insulating housing 10 and a moving conductive rod 21 connected to the moving contact and extending outside the insulating housing 10. The upper cover plate 12 is sealed with a guide sleeve 121. The moving conductive rod 21 and the guide sleeve 121 form a slidable fit to realize sliding guidance of the moving conductive rod 21 and prevent trajectory deviation.

[0031] The static end portion includes a static contact assembled in the insulating housing 10 and a static end terminal socket 31 connected to the static contact and extending outside the insulating housing 10. Specifically, the static end terminal socket 31 is assembled on the lower cover 13. The moving contact 22 of the moving end portion corresponds to the static contact 32 of the static end portion. The moving conductive rod 21 of the moving end portion is externally connected to a driving mechanism, and under the drive of the driving mechanism, the moving contact 22 is driven to contact the static contact 32 to achieve closing, or separated from the static contact 32 to achieve opening.

[0032] Furthermore, in this embodiment, a shielding cylinder 40 is further provided in the sealed chamber of the insulating housing 10, and the moving contact 22 of the moving end portion and the static contact 32 of the static end portion are located in the shielding cylinder 40. The arc generated during the opening and closing of the moving contact 22 and the static contact 32 is effectively shielded.

[0033] The shielding tube 40 is welded and fixed to the inner wall of the ceramic shell 11, and the outer wall position a of the ceramic shell 11 corresponding to the welding point is an annular protrusion 111. Specifically, the inner wall of the ceramic shell 11 has an abutting step 112, and the shielding tube 40 abuts against the abutting step 112 and is fixed by welding, so as to achieve accurate and stable assembly. Figure 3 As shown, the outer wall position a corresponding to the welding position (ie, the abutting step 112) is a raised annular protrusion 111, so that the thickness of the ceramic shell 11 at this position is effectively guaranteed to ensure insulation.

[0034] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A vacuum interrupter for an air-insulated ring main unit, comprising an insulating housing and a moving end portion and a static end portion assembled in the insulating housing, characterized in that: The insulating shell comprises a ceramic shell, and an shed structure is integrally formed on the outer peripheral side of the ceramic shell; the shed structure is a plurality of annular protrusions arranged at intervals along the length direction of the ceramic shell.

2. The vacuum interrupter for an air-insulated ring main unit according to claim 1, characterized in that: The outer surface of the annular protrusion is an arc-shaped surface.

3. The vacuum interrupter for an air-insulated ring main unit according to claim 1, characterized in that: The protrusion ends of the plurality of annular protrusions are flush with each other.

4. The vacuum interrupter for an air-insulated ring main unit according to claim 1, characterized in that: The upper and lower ends of the ceramic shell are respectively provided with openings, and the insulating shell also includes an upper cover plate and a lower cover plate, the upper cover plate covers the upper opening of the ceramic shell, and the lower cover plate covers the lower opening of the ceramic shell, and the ceramic shell, the upper cover plate and the lower cover plate participate in enclosing and forming a closed chamber, and the moving end part and the static end part both have contacts located in the closed chamber, and the moving contact of the moving end part corresponds to the static contact of the static end part.

5. The vacuum interrupter for air-insulated ring main unit according to claim 4, characterized in that: A shielding cylinder is also arranged in the sealed chamber of the insulating shell, and the moving contact of the moving end part and the static contact of the static end part are located in the shielding cylinder.

6. The vacuum interrupter for an air-insulated ring main unit according to claim 5, characterized in that: The shielding cylinder is fixed to the inner wall of the ceramic shell by welding, and the outer wall position of the ceramic shell corresponding to the welding position is an annular protrusion.

7. The vacuum interrupter for an air-insulated ring main unit according to claim 6, characterized in that: The inner wall of the ceramic shell has an abutting step, and the shielding tube abuts against the abutting step and is fixed by welding.

8. The vacuum interrupter for an air-insulated ring main unit according to claim 1 or 4, characterized in that: The moving end portion comprises a moving contact assembled in an insulating housing and a moving conductive rod connected to the moving contact and extending out of the insulating housing.

9. The vacuum interrupter for an air-insulated ring main unit according to claim 1 or 4, characterized in that: The static end part comprises a static contact assembled in an insulating housing and a static end wiring seat connected to the static contact and extending outside the insulating housing.

10. An air-insulated ring main unit, characterized in that: At least comprises a vacuum interrupter for an air-insulated ring main unit as described in any one of claims 1 to 9.

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