A cold shrink type climbing umbrella, insulating porcelain bottle and disconnecting switch

Abstract

The utility model relates to a cold shrinkage type climbing increasing umbrella, insulating porcelain bottle and disconnecting switch, wherein the cold shrinkage type climbing increasing umbrella comprises: a climbing increasing umbrella, which comprises an umbrella skirt main body; a supporting body, which comprises a silk tube formed by winding a single fine wire according to a preset thread shape; the silk tube is attached to the inner wall of the umbrella skirt main body; the end of the silk tube is reserved with a silk head; wherein, in the expanded state of the climbing increasing umbrella, the umbrella skirt main body is sleeved on the supporting body, and the climbing increasing umbrella is supported and opened by the supporting body; the silk head is pulled to separate the fine wire, the supporting body is disassembled, and the climbing increasing umbrella is contracted. The utility model effectively increases the creepage distance of the insulator porcelain bottle, can further improve the insulating level of the porcelain bottle, and has no open fire and high-temperature heat source in the whole installation process, completely avoids the fire risk, and makes the climbing increasing umbrella safe in construction in the explosion-proof places such as the transformer substation and the oil refinery.

Description

Technical Field

[0001] This utility model relates to the field of power transmission and transformation technology, and in particular to a cold-shrink climbing umbrella, an insulating porcelain insulator, and a disconnecting switch. Background Technology

[0002] In power transmission and transformation systems, insulating porcelain insulators (insulators) are key components for ensuring line safety. With increasing industrial pollution and frequent extreme weather events, the surface of porcelain insulators is prone to accumulating dirt and moisture, which can lead to flashover accidents.

[0003] Increasing the creepage distance is the core means to improve the anti-pollution flashover capability of insulators. There are two traditional methods to increase the creepage distance:

[0004] 1. Replace with a larger ceramic insulator, but this is costly and requires modification of the tower structure;

[0005] 2. Adding silicone rubber creepage extension skirts, which extends the creepage path by adding skirts, is the current mainstream solution. In recent years, field-installable creepage extension skirts have become a focus of industry research and development due to their ease of installation and the fact that they do not require replacement of porcelain insulators. Among them, heat-shrink creepage extension skirts are widely used, but they have significant drawbacks.

[0006] For example, the heat-shrinkable single-hole umbrella skirt disclosed in Chinese utility model patent (CN201466656U) has a structure of an umbrella-shaped silicone rubber sheet with a hot melt adhesive coating on the inner wall. During installation, the umbrella skirt is placed over the surface of the ceramic bottle, and then heated evenly using a flame gun or hot air gun. This causes the umbrella skirt to shrink and tightly wrap around the ceramic bottle, and the hot melt adhesive melts to achieve a seal. The above structure has the following shortcomings:

[0007] 1. Safety Hazards: Open flame construction can easily ignite vegetation around the power lines, and is prohibited in explosion-proof locations such as substations;

[0008] 2. Risk of thermal damage to porcelain bottles: Localized high temperatures can cause micro-cracks in the glaze of porcelain bottles (especially in older bottles), which accelerates deterioration during long-term operation.

[0009] 3. Unstable installation quality: Relying on manual heating, uneven shrinkage can easily create air gaps, reducing sealing and adhesion. Utility Model Content

[0010] To address the shortcomings of existing technologies, this utility model discloses a cold-shrink climbing umbrella, an insulating porcelain bottle, and a disconnecting switch.

[0011] The technical solution adopted in this utility model is as follows:

[0012] Firstly, a shrinkable climbing umbrella is provided, comprising:

[0013] Climbing umbrella, including the main body of the umbrella skirt;

[0014] The support body includes a wire tube formed by winding a single filament in a preset spiral shape; the wire tube is attached to the inner wall of the umbrella skirt body; and the end of the wire tube is provided with a wire end;

[0015] In the expanded state of the climbing umbrella, the main body of the umbrella skirt is fitted onto the support body, and the climbing umbrella is opened by the support body; pulling the filament head separates the filaments, the support body disintegrates, and the climbing umbrella contracts.

[0016] In one embodiment of this utility model, the climbing umbrella further includes a first connector connected to a first surface of the umbrella skirt body and a second connector connected to a second surface of the umbrella skirt body; in the expanded state of the climbing umbrella, the first connector and the second connector extend a predetermined distance away from the umbrella skirt body and fit against the support body; in the contracted state of the climbing umbrella, the edges of the first connector and the edges of the second connector bend towards the umbrella skirt body.

[0017] In one embodiment of this utility model, in the retracted state of the climbing umbrella, the outer diameter of the umbrella skirt body is D1, the inner diameter of the first connecting body is D2, the inner diameter of the second connecting body is D3, and the inner diameter of the umbrella skirt body is D4. D1, D2, D3, and D4 satisfy the following relationship: D4 < D3 < D1; D4 < D2 < D1.

[0018] In one embodiment of this utility model, the climbing umbrella is made of silicone rubber or EPDM rubber.

[0019] In one embodiment of this utility model, the radial expansion ratio of the climbing umbrella is (2-8):1.

[0020] In one embodiment of this utility model, the original inner diameter of the climbing umbrella is 20mm, and the inner diameter of the climbing umbrella after being opened by the support body is 60mm.

[0021] In one embodiment of this utility model, the filament is made of polypropylene or polyethylene.

[0022] Secondly, an insulating porcelain bottle is provided, including a shrinkable climbing umbrella as described above; the shrinkable climbing umbrella is attached to the umbrella sheet of the insulating porcelain bottle after shrinking.

[0023] Thirdly, a disconnecting switch is provided, comprising at least one insulating porcelain insulator as described above.

[0024] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0025] The cold-shrink climbing umbrella described in this utility model eliminates safety hazards during the installation process: it completely avoids the need for open flames or high-temperature heat sources during construction, solves the problem of its prohibition in flammable and explosive places, and achieves safe installation with zero heat source and no fire risk.

[0026] The cold-shrink climbing umbrella of this utility model eliminates thermal and stress damage to porcelain bottles: by using a non-thermal driven method, it avoids thermal shock cracks on the glaze surface of porcelain bottles caused by the heat shrinking process; at the same time, it overcomes the porcelain bottle compression damage caused by residual stress due to the pre-expansion cold shrinking technology, and achieves porcelain bottle protection with zero thermal stress and zero mechanical stress.

[0027] The cold-shrink climbing umbrella described in this utility model improves installation quality and adaptability: it develops an adaptive wrapping structure to ensure that the climbing umbrella forms a tight seal with no air gaps and high adhesion on the surface of the ceramic bottle, which is especially suitable for irregularly shaped ceramic bottles with large taper changes; it simplifies the installation process and enables efficient construction that can be operated by a single person without special tools. Attached Figure Description

[0028] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the structure of the cold-shrink climbing umbrella in this utility model.

[0030] Figure 2 This is the front view of the cold-shrink climbing umbrella of this utility model.

[0031] Figure 3 This is a structural schematic diagram of the climbing umbrella in this utility model.

[0032] Figure 4 This is the front view of the climbing umbrella in this utility model.

[0033] Figure 5 This is a cross-sectional view of the climbing umbrella in this utility model.

[0034] Figure 6 This is a schematic diagram of the disconnecting switch in this utility model.

[0035] Figure 7 This is the front view of the disconnector switch in this utility model.

[0036] Explanation of reference numerals in the instruction manual:

[0037] 10. Climbing umbrella; 101. Umbrella skirt body; 102. First connecting body; 103. Second connecting body; 20. Support body; 30. Insulating porcelain bottle; 41. Operating lever; 42. Switch head; 43. Base. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0039] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present utility model. Furthermore, in all embodiments, the same reference numerals denote the same elements.

[0040] Combination Figures 1 to 4 A shrinkable climbing umbrella includes a climbing umbrella 10 and a support body 20.

[0041] The climbing umbrella 10 includes a skirt body 101, a first connector 102 connected to a first surface of the skirt body 101, and a second connector 103 connected to a second surface of the skirt body 101.

[0042] The support body 20 includes a wire tube formed by winding a single filament in a preset spiral shape; the wire tube fits against the inner wall of the umbrella skirt body 101; and the end of the wire tube is reserved with a wire end.

[0043] In the expanded state of the climbing umbrella 10, the umbrella skirt body 101 is fitted onto the support body 20, and the climbing umbrella 10 is opened by the support body 20; pulling the filament head separates the filaments, the support body 20 decomposes, and the climbing umbrella 10 contracts.

[0044] In the expanded state of the climbing umbrella 10, the first connector 102 and the second connector 103 extend a predetermined distance away from the umbrella skirt body 101 and fit against the support body 20. In the contracted state of the climbing umbrella 10, the edges of the first connector 102 and the edges of the second connector 103 bend towards the umbrella skirt body 101.

[0045] like Figure 5 As shown, in the retracted state of the climbing umbrella 10, the outer diameter of the umbrella skirt body 101 is D1, the inner diameter of the first connecting body 102 is D2, the inner diameter of the second connecting body 103 is D3, and the inner diameter of the umbrella skirt body 101 is D4. D1, D2, D3, and D4 satisfy the following relationship: D4 < D3 < D1; D4 < D2 < D1.

[0046] Climbing umbrellas 10 typically use high-performance silicone rubber or EPDM rubber. These materials have good electrical insulation properties, weather resistance, high and low temperature resistance, chemical corrosion resistance, and excellent elasticity.

[0047] The selected rubber material needs to be treated by chemical crosslinking or, more commonly, radiation crosslinking. Radiation crosslinking (such as electron beam irradiation) forms strong chemical bonds (crosslinking points) between rubber molecular chains, giving the material the ability to "remember" its original shape and significantly improving its mechanical strength, heat resistance, and aging resistance.

[0048] The cross-linked rubber tube is radially expanded to a size much larger than its original inner diameter under specific conditions (usually requiring heating to reduce the elastic modulus). The expansion ratio can be 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, or 8:1.

[0049] In the expanded state, the rubber tube is rapidly cooled and fitted onto a support 20 of a specific size. The support 20 is typically a spirally wound plastic strip, usually made of PP (Polypropylene) or PE (Polyethylene). The support 20 provides temporary support to prevent the expanded rubber tube from shrinking back.

[0050] At this point, the rubber tube, expanded and fixed to the support 20, is in a "frozen" stress state. It "remembers" its original unexpanded size and shape.

[0051] At the construction site, after the cold-shrink climbing umbrella is placed over the insulating porcelain insulator 30, the internal support 20 is removed by pulling or rotating it. Once the support 20 is removed, the climbing umbrella 10 automatically shrinks at room temperature due to its strong elastic recovery force (i.e., memory effect), tightly wrapping around the umbrella sheet of the insulating porcelain insulator 30 to form a reliable, uniform, and durable insulation and sealing layer. This process does not require heating, hence the name "cold shrink".

[0052] The manufacturing process of the cold-shrink climbing umbrella is as follows:

[0053] S1. Raw material preparation and mixing: The raw rubber (silicone rubber or EPDM granules) and various additives (vulcanizing agents / crosslinking agents, reinforcing fillers such as silica, plasticizers, flame retardants, colorants, anti-aging agents, etc.) are precisely weighed according to a strict formula.

[0054] S2. Thoroughly mix the components in an internal mixer or open mill to ensure uniform dispersion and form a compound.

[0055] S3. Extrusion Molding: The compounded rubber is extruded through an extruder to obtain a rubber tube blank with the required inner diameter, wall thickness, and length. The extrusion process requires precise control of temperature, pressure, and speed to ensure that the tube blank is dimensionally stable, free of bubbles, and free of impurities.

[0056] S4. Crosslinking (Vulcanization / Radiation): Radiation crosslinking involves irradiating the extruded preform using an electron accelerator. The high-energy electron beam penetrates the rubber, breaking down molecular chains and generating free radicals. These free radicals then combine to form a crosslinked network. The irradiation dose is a critical parameter, directly affecting the degree of crosslinking, memory properties, and the final product performance.

[0057] Chemical cross-linking (less commonly used in cold shrink tubing): This method involves heating the tubing blank to cause a chemical reaction with the vulcanizing agent, forming a cross-linked network (vulcanization). However, this method is more difficult to control during subsequent expansion.

[0058] S5. Expansion and Shaping: The cross-linked rubber tube is heated (e.g., by steam, hot air, or infrared radiation) to soften it and reduce its elastic modulus. Using specialized expansion equipment (such as a conical mandrel or pneumatic / hydraulic expander), the heated and softened rubber tube is radially expanded to the design dimensions, such as from the original inner diameter Φ20mm to Φ60mm. While expanded, the rubber tube is rapidly cooled (e.g., by spraying with cold water or cooling with cold air) to "freeze" it in the expanded state. The cooled and shaped rubber tube is immediately fitted onto a pre-sized spiral support 20. The spiral structure of the support 20 allows for easy removal during subsequent construction.

[0059] The shrink-fit climbing umbrella provided in this embodiment has at least the following advantages:

[0060] 1. Increases the creepage distance of porcelain insulators: Effectively increases the creepage distance of insulator porcelain insulators, which can further improve the insulation level of porcelain insulators. The entire installation process is free of open flames and high-temperature heat sources, completely avoiding fire risks, and enabling creepage umbrellas to be safely installed in explosion-proof locations such as substations and oil refineries.

[0061] Compared to existing heat shrink technology, the construction safety level has been upgraded from prohibited level (ISO 80079 Level IV) to unrestricted level.

[0062] II. Achieving zero-damage protection for porcelain bottles. Room temperature shrinkage avoids thermal cracking of the glaze, extending the life of the porcelain bottle; the 1:2 taper ratio ensures uniform distribution of shrinkage force (measured radial pressure <0.5MPa), and the axial stress groove releases >90% of the residual stress, resulting in a 0% stress cracking rate for the porcelain bottle, while the cracking rate of pre-expansion and cold shrinkage technology is 12%.

[0063] III. Improved construction efficiency. No hot air gun or support bar pulling tool is required; installation can be done by hand, with a single person's operation time ≤90 seconds; the first-pass yield rate is 100%, and the installation quality is not affected by manual skills.

[0064] This embodiment also provides an insulating porcelain insulator 30, including the aforementioned shrinkable climbing umbrella. The shrinkable climbing umbrella, after shrinking, adheres to the umbrella panels of the insulating porcelain insulator 30. Specifically, the shrinkable climbing umbrella is fitted onto the umbrella panels of the insulating porcelain insulator 30 to be installed. The support body 20 is pulled, and the climbing umbrella 10 begins to shrink. The initially shrunken portion tightly adheres to the umbrella panels of the insulating porcelain insulator 30. The wire bundle of the support body 20 is continued to be pulled until the climbing umbrella 10 is fully shrunken, ultimately allowing the shrinkable climbing umbrella to tightly fit onto the insulating porcelain insulator 30.

[0065] This embodiment also provides a disconnecting switch, including at least one of the aforementioned insulating porcelain insulators 30. (Combined with...) Figure 6 and Figure 7 A disconnecting switch includes two insulating porcelain insulators 30 as described above, fixed to a base 43. Using the operating lever 41, the pull head 42 is hooked and pulled downwards to disconnect the connection, thus achieving the isolating function.

[0066] It should be noted that the main design feature of this utility model is the structural improvement of the cold-shrink climbing umbrella. The electrical connection parts and mechanical structure parts of the existing insulating porcelain bottle 30 and disconnecting switch will not be described in detail.

[0067] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A shrinkable climbing umbrella, characterized in that, include: The climbing umbrella (10) includes a skirt body (101), a first connector (102) connected to a first surface of the skirt body (101), and a second connector (103) connected to a second surface of the skirt body (101). In the expanded state, the first connector (102) and the second connector (103) extend a predetermined distance away from the skirt body (101) and fit against the support body (20). In the contracted state, the edges of the first connector (102) and the second connector (103) bend towards the skirt body (101). The support body (20) includes a wire tube formed by winding a single filament in a preset spiral shape; the wire tube is attached to the inner wall of the umbrella skirt body (101); and the end of the wire tube is reserved with a wire end; In the expanded state of the climbing umbrella (10), the umbrella skirt body (101) is fitted onto the support body (20), and the climbing umbrella (10) is opened by the support body (20); when the filament head is pulled to separate the filaments, the support body (20) decomposes, and the climbing umbrella (10) contracts.

2. The cold-shrink climbing umbrella according to claim 1, characterized in that, In the retracted state of the climbing umbrella (10), the outer diameter of the umbrella skirt body (101) is D1, the inner diameter of the first connecting body (102) is D2, the inner diameter of the second connecting body (103) is D3, and the inner diameter of the umbrella skirt body (101) is D4. D1, D2, D3 and D4 satisfy the following relationship: D4 < D3 < D1; D4 < D2 < D1.

3. The cold-shrink climbing umbrella according to claim 1, characterized in that, The climbing umbrella (10) is made of silicone rubber or EPDM rubber.

4. The cold-shrink climbing umbrella according to claim 1, characterized in that, The radial expansion ratio of the climbing umbrella (10) is (2-8):

1.

5. The cold-shrink climbing umbrella according to claim 4, characterized in that, The original inner diameter of the climbing umbrella (10) is 20mm, and the inner diameter of the climbing umbrella (10) after being opened by the support body (20) is 60mm.

6. The cold-shrink climbing umbrella according to claim 1, characterized in that, The filaments are made of polypropylene or polyethylene.

7. An insulating porcelain bottle, characterized in that, Includes the shrinkable climbing umbrella as described in any one of claims 1-6; the umbrella slats of the shrinkable climbing umbrella are attached to the insulating porcelain bottle (30) after shrinking.

8. A disconnecting switch, characterized in that, Includes at least one insulating porcelain bottle (30) as described in claim 7.

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