An insulation solid sealing method suitable for sectional short porcelain shell vacuum arc-extinguishing chamber

Abstract

The application discloses a kind of suitable for the insulation solid sealing method of segmented short porcelain shell vacuum interrupter, including soft silicone rubber layer, epoxy resin insulation layer, vacuum interrupter, hard silicone rubber layer, and the vacuum interrupter structure includes two porcelain shells and a section intermediate metal ring;Hard silicone rubber layer is circumferentially covered on the outer surface of vacuum interrupter cylinder, and soft silicone rubber layer vulcanization is covered on the outer surface of hard silicone rubber layer cylinder and the upper and lower end surfaces of vacuum interrupter, and epoxy resin insulation layer is solid sealed on the outer surface of soft silicone rubber layer, and hard silicone rubber layer, soft silicone rubber layer and epoxy resin insulation layer jointly constitute the outer insulation medium of vacuum interrupter.The structure is simple, and process is novel and scientific, and universality is strong, can improve the reliability and stability of segmented short porcelain shell vacuum interrupter using APG pressure gel process for insulation solid sealing, and the technical advantage is outstanding, and economic benefit is remarkable.

Description

Technical Field

[0001] This invention relates to a vacuum interrupter sealing process technology, and more particularly to an insulation sealing method suitable for segmented short ceramic shell vacuum interrupters. Background Technology

[0002] Vacuum interrupters and vacuum interruption technology have wide applications in medium and high voltage switchgear. Currently, vacuum interrupter technology is used in the main circuit breakers of high voltage systems in the rail transit sector. 27.5kV railway vacuum interrupters are all segmented porcelain shell structures, with different heights for the two porcelain shell sections and the connecting metal section in between. Vacuum interrupters with a short porcelain shell and long metal transition structure can achieve voltage equalization and shielding through the intermediate metal transition section, saving the need for an internal shielding cover. This results in a smaller overall structure, easier matching of operating mechanism parameters, and numerous application advantages.

[0003] The design and manufacturing process of the external insulation of the vacuum interrupter are key aspects to ensure the overall performance of the switchgear.

[0004] In existing technologies, external insulation media mainly include inert gases such as SF6 and solid materials such as silicone rubber and epoxy resin. The main molding process for silicone rubber external insulation is vulcanization or potting, while the main molding process for epoxy resin external insulation is APG pressure gel. For vacuum interrupters with segmented short ceramic shell structures, where the height of the intermediate metal transition section is relatively large and the height of the ceramic shells at both ends is relatively small, the following problems exist when using the APG pressure gel molding process:

[0005] 1) Inconsistent arc-extinguishing chamber diameters lead to different epoxy resin shrinkage, which can easily cause internal defects and thus partial discharge.

[0006] 2) The shorter ceramic shell results in a limited effective insulation interface, requiring higher interface insulation strength;

[0007] 3) During the pressure forming process, the intermediate metal part is prone to deformation, which can lead to leakage in the arc-extinguishing chamber and reduce the yield.

[0008] Based on the above, it is essential to research and develop a novel insulation and sealing method suitable for segmented short ceramic shell vacuum interrupters, to fully leverage the combined technical advantages of segmented short ceramic shell vacuum interrupters and APG pressure gel sealing processes, while also improving the versatility and technical level of the sealing process.

[0009] In view of this, the present invention is hereby proposed. Summary of the Invention

[0010] The purpose of this invention is to provide an insulation sealing method suitable for segmented short ceramic shell vacuum interrupters. This method can improve the reliability and stability of insulation sealing of segmented short ceramic shell vacuum interrupters using APG pressure gel technology, ensure product consistency and pass rate, enrich the versatility of insulation sealing process, and has significant technical advantages and economic benefits.

[0011] The objective of this invention is achieved through the following technical solution:

[0012] The present invention provides an insulation and sealing method for segmented short ceramic shell vacuum interrupters, comprising a soft silicone rubber layer, an epoxy resin insulation layer, a vacuum interrupter, and a hard silicone rubber layer. The vacuum interrupter structure comprises two ceramic shells and a middle metal ring.

[0013] The hard silicone rubber layer is circumferentially covered on the outer surface of the cylinder of the vacuum interrupter. The soft silicone rubber layer is vulcanized and covered on the outer surface of the cylinder of the hard silicone rubber layer and the upper and lower end faces of the vacuum interrupter. The epoxy resin insulating layer is fixed on the outer surface of the soft silicone rubber layer. The hard silicone rubber layer, the soft silicone rubber layer and the epoxy resin insulating layer together constitute the outer insulating medium of the vacuum interrupter.

[0014] As can be seen from the technical solutions provided by the present invention above, the insulation and sealing method for segmented short ceramic shell vacuum interrupters provided by the embodiments of the present invention solves the practical engineering problems such as leakage, excessive partial discharge, and low product qualification rate that easily occur when segmented short ceramic shell vacuum interrupters adopt the APG insulation and sealing process. It can improve product reliability and stability, enrich the versatility of insulation and sealing process, has outstanding technical advantages, strong practicality, significant economic benefits, and has promotion value and broad application prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the insulation and sealing method for a segmented short ceramic shell vacuum interrupter provided in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of a segmented short ceramic shell vacuum interrupter provided in an embodiment of the present invention.

[0017] In the picture:

[0018] 1. Soft silicone rubber layer, 2. Epoxy resin insulation layer, 3. Vacuum interrupter, 4. Hard silicone rubber layer

[0019] A. Ceramic shell, B. Middle metal ring Detailed Implementation

[0020] 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 a part of the embodiments of the present invention, and not all of them, and do not constitute a limitation on the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0021] First, the following explanations are provided for the terms that may be used in this article:

[0022] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0023] The terms “including,” “comprising,” “containing,” “having,” or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, “including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.)” should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0024] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0025] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0026] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0027] The contents not described in detail in the embodiments of this invention are prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of this invention, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Where the manufacturers of the reagents or instruments used in the embodiments of this invention are not specified, they are all conventional products that can be purchased commercially.

[0028] The present invention provides an insulation and sealing method for segmented short ceramic shell vacuum interrupters, comprising a soft silicone rubber layer, an epoxy resin insulation layer, a vacuum interrupter, and a hard silicone rubber layer. The vacuum interrupter structure comprises two ceramic shells and a middle metal ring.

[0029] The hard silicone rubber layer is circumferentially covered on the outer surface of the cylinder of the vacuum interrupter. The soft silicone rubber layer is vulcanized and covered on the outer surface of the cylinder of the hard silicone rubber layer and the upper and lower end faces of the vacuum interrupter. The epoxy resin insulating layer is fixed on the outer surface of the soft silicone rubber layer. The hard silicone rubber layer, the soft silicone rubber layer and the epoxy resin insulating layer together constitute the outer insulating medium of the vacuum interrupter.

[0030] After the hard silicone rubber layer is coated on the outer surface of the cylinder of the vacuum interrupter, the whole is a cylinder of the same diameter, and the surface Shore hardness is not less than 60 degrees.

[0031] Including the technological process:

[0032] First, the hard silicone rubber layer is coated on the outer surface of the vacuum interrupter cylinder by non-pressure molding or low-pressure molding process. If necessary, an adhesive is added between the two. After curing, the same diameter and hardness of the hard silicone rubber layer are checked and confirmed, and the outer surface of the hard silicone rubber layer is uniformly roughened.

[0033] Secondly, through a vulcanization process, the soft silicone rubber layer is coated on the outer surface of the cylindrical hard silicone rubber layer and the upper and lower end faces of the vacuum interrupter. After curing, the outer surface of the soft silicone rubber layer is uniformly roughened.

[0034] Finally, the epoxy resin insulating layer is sealed on the outer surface of the soft silicone rubber layer using the APG pressure gel process, and the final product is formed after curing and shaping.

[0035] The hard silicone rubber layer needs to fill the transition area between the ceramic shell and the intermediate metal ring of the vacuum interrupter.

[0036] The minimum thickness of the hard silicone rubber layer is not less than 3 mm, and the thickness of the soft silicone rubber layer is not less than 2 mm.

[0037] In this invention:

[0038] After the hard silicone rubber layer is wrapped around the outer surface of the cylinder of the vacuum interrupter, the whole is a cylinder of the same diameter. This avoids the formation of air gaps due to the different shrinkage of epoxy resin during the subsequent APG pressure gel sealing process. In addition, its surface Shore hardness is not less than 60 degrees, so as to protect the metal ring in the middle of the vacuum interrupter during pressure gel sealing.

[0039] The hard silicone rubber layer needs to fill the transition area between the ceramic shell and the intermediate metal ring of the vacuum interrupter. The hard silicone rubber layer has good adhesion, or an adhesive can be added between the hard silicone rubber layer and the vacuum interrupter to ensure that there is no air gap between the two, so as to protect the intermediate metal ring of the vacuum interrupter while ensuring the interface insulation strength between the two.

[0040] The vacuum interrupter is a cylinder of different diameters, while the hard silicone rubber layer, after being covered, is a cylinder of the same diameter. Therefore, the coating thickness of the hard silicone rubber layer is different, and the minimum thickness position must be not less than 3mm to play a protective role; the thickness of the soft silicone rubber layer is not less than 2mm to play a buffering role during APG pressure gel sealing.

[0041] In summary, the insulation and sealing method for segmented short ceramic shell vacuum interrupters according to the embodiments of the present invention has a simple structure and process, novel and scientific technology, good practicality, and strong versatility. It can solve practical engineering problems, effectively improve the reliability and stability of insulation and sealing of segmented short ceramic shell vacuum interrupters using APG pressure gel technology, ensure product qualification rate, save costs, significantly improve the process, highlight technical advantages, and have significant economic benefits, with broad application prospects.

[0042] To more clearly demonstrate the technical solution and its effects provided by the present invention, the embodiments of the present invention will be described in detail below with reference to specific examples.

[0043] Example 1

[0044] like Figure 1-2As shown, this invention relates to an insulation and sealing method for segmented short-shell porcelain vacuum interrupters, comprising a soft silicone rubber layer 1, an epoxy resin insulation layer 2, a vacuum interrupter 3, and a hard silicone rubber layer 4. The vacuum interrupter 3 consists of two porcelain shells A and a central metal ring B. The hard silicone rubber layer 4 circumferentially covers the outer cylindrical surface of the vacuum interrupter 3. The soft silicone rubber layer 1 is vulcanized and covered on the outer cylindrical surface of the hard silicone rubber layer 4 and the upper and lower end faces of the vacuum interrupter 3. The epoxy resin insulation layer 2 is sealed on the outer surface of the soft silicone rubber layer 1. The hard silicone rubber layer 4, the soft silicone rubber layer 1, and the epoxy resin insulation layer 2 together constitute the external insulation medium of the vacuum interrupter 3. In this embodiment, the vacuum interrupter 3 is used in a 27.5kV main circuit breaker, and the epoxy resin insulation layer 2 has a thickness of 15mm.

[0045] After the hard silicone rubber layer 4 is coated onto the outer surface of the cylinder of the vacuum interrupter 3, the entire structure is a cylinder of the same diameter. This avoids air gaps caused by different shrinkage rates of the epoxy resin during the subsequent APG pressure gel sealing process. Furthermore, its surface Shore hardness is not less than 60 degrees, thus protecting the central metal ring of the vacuum interrupter 3 during pressure gel sealing. In this embodiment, the hard silicone rubber layer 4, after curing, is a cylinder of uniform diameter, with a diameter of 129 mm and a surface Shore hardness of 70 degrees.

[0046] The insulation and sealing process applicable to the segmented short ceramic shell vacuum interrupter 3 includes the following steps:

[0047] First, a hard silicone rubber layer 4 is coated onto the cylindrical outer surface of the vacuum interrupter 3 using a non-pressure molding or low-pressure molding process. If necessary, an adhesive is added between the two. After curing, the diameter and hardness of the hard silicone rubber layer 4 are checked and confirmed, and the outer surface of the hard silicone rubber layer 4 is uniformly roughened. In this embodiment, the hard silicone rubber layer 4 is coated onto the cylindrical outer surface of the vacuum interrupter 3 using a weight-based potting process, resulting in relatively small circumferential forces on the vacuum interrupter 3 during potting. Furthermore, the outer surface of the hard silicone rubber layer 4 is sandblasted after curing.

[0048] Secondly, through a vulcanization process, the soft silicone rubber layer 1 is coated onto the cylindrical outer surface of the hard silicone rubber layer 4 and the upper and lower end faces of the vacuum interrupter 3. After curing, the outer surface of the soft silicone rubber layer 1 is uniformly roughened. In this embodiment, the outer surface of the soft silicone rubber layer 1 is sandblasted after curing.

[0049] Finally, the epoxy resin insulation layer 2 is sealed onto the outer surface of the soft silicone rubber layer 1 using the APG pressure gel process, and after curing and shaping, the final product is formed. In this embodiment, the cured and shaped product is the main circuit breaker sealed pole product.

[0050] The hard silicone rubber layer 4 needs to fill the transition area between the ceramic shell and the intermediate metal ring of the vacuum interrupter 3. The hard silicone rubber layer 4 has good adhesion, or an adhesive can be added between the hard silicone rubber layer 4 and the vacuum interrupter 3 to ensure that there is no air gap between them, thus protecting the intermediate metal ring of the vacuum interrupter 3 while ensuring the interfacial insulation strength between them. In this embodiment, the hard silicone rubber layer 4 has good adhesion, and no adhesive is added between the hard silicone rubber layer 4 and the vacuum interrupter 3; it is sufficient to ensure that the outer surface of the vacuum interrupter 3 is clean.

[0051] The vacuum interrupter 3 is a cylinder with a non-uniform diameter, while the hard silicone rubber layer 4, after being covered, becomes a cylinder with the same diameter. Therefore, the covering thickness of the hard silicone rubber layer 4 varies, and the minimum thickness at certain locations must be no less than 3 mm to provide protection. The thickness of the soft silicone rubber layer 1 is no less than 2 mm to provide cushioning during APG pressure gel sealing. In this embodiment, the minimum thickness of the hard silicone rubber layer 4 is 4 mm, and the thickness of the soft silicone rubber layer 1 is 2.5 mm.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An insulation and sealing method suitable for segmented short ceramic shell vacuum interrupters, characterized in that, It includes a soft silicone rubber layer, an epoxy resin insulating layer, a vacuum interrupter, and a hard silicone rubber layer. The vacuum interrupter structure includes two ceramic shells and a middle metal ring. The hard silicone rubber layer is circumferentially covered on the outer surface of the cylinder of the vacuum interrupter. The soft silicone rubber layer is vulcanized and covered on the outer surface of the cylinder of the hard silicone rubber layer and the upper and lower end faces of the vacuum interrupter. The epoxy resin insulating layer is sealed on the outer surface of the soft silicone rubber layer. The hard silicone rubber layer, the soft silicone rubber layer and the epoxy resin insulating layer together constitute the outer insulating medium of the vacuum interrupter. The vacuum interrupter is a cylinder of different diameters. After the hard silicone rubber layer is wrapped around the outer surface of the vacuum interrupter cylinder, the whole cylinder is a cylinder of the same diameter, and the surface Shore hardness is not less than 60 degrees. Including the following steps: First, the hard silicone rubber layer is coated on the outer surface of the cylinder of the vacuum interrupter using a non-pressure molding or low-pressure molding process. After curing, the same diameter and hardness of the hard silicone rubber layer are checked and confirmed, and the outer surface of the hard silicone rubber layer is uniformly roughened. Secondly, through a vulcanization process, the soft silicone rubber layer is coated on the outer surface of the cylindrical hard silicone rubber layer and the upper and lower end faces of the vacuum interrupter. After curing, the outer surface of the soft silicone rubber layer is uniformly roughened. Finally, the epoxy resin insulating layer is sealed on the outer surface of the soft silicone rubber layer by the APG pressure gel process, and the final product is formed after curing and shaping. The hard silicone rubber layer needs to fill the transition area between the ceramic shell and the intermediate metal ring of the vacuum interrupter.

2. The insulation and sealing method for segmented short ceramic shell vacuum interrupters according to claim 1, characterized in that, The minimum thickness of the hard silicone rubber layer is not less than 3 mm, and the thickness of the soft silicone rubber layer is not less than 2 mm.

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