Sealing structure of solid insulation cabinet

Abstract

According to the sealing structure of the solid insulation cabinet, the solid insulation cabinet comprises a frame body and a plurality of electrical function parts arranged in the cabinet body, the cabinet body is provided with a plurality of cable inlets and sealing grooves, the cable inlets are provided with sealing sleeve structures, and the sealing grooves are provided with sealing strip structures; a temperature control compensation part is arranged in the sealing sleeve structure, and the effect of thermal expansion and cold contraction can be generated when the temperature changes; a self-sealing assembly is arranged in the sealing strip structure, the self-sealing assembly can release a repairing agent after being broken, and the repairing agent forms an elastic sealing body after being cured; the environment adaptability of the ring main unit sealing device is improved through the self-sealing assembly and the temperature control supplement assembly, micro-positive pressure in the ring main unit is maintained in combination with the air pressure balance valve, the problems of condensation and corrosion in the high-humidity and salt-mist environment are thoroughly solved, meanwhile, the sealing strip which cracks due to aging can be automatically sealed through the self-sealing assembly, the service life of the sealing structure is prolonged, and the sealing effect is good. And the device is suitable for various severe environments, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, and more specifically to a sealing structure for a solid insulation cabinet. Background Technology

[0002] Solid-insulated switchgear, also known as ring main unit, is an electrical device that houses a group of power transmission and distribution equipment (high-voltage switchgear) within a metal or non-metal insulated cabinet or is configured as a modular ring network power supply unit. Its core components utilize load switches and fuses. It offers advantages such as simple structure, small size, low cost, improved power supply parameters and performance, and enhanced power supply safety. It is widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories.

[0003] Environmentally friendly gas-insulated ring main units require the installation of insulating sealing strips on the cabinet doors during the production process to ensure the overall airtightness of the cabinet. Similar to all equipment with sealing strips, various problems may occur with the increasing years of use, leading to a decrease in sealing effect or even failure. The main reason is that the sealing strips age and crack, producing fine cracks, which can cause SF6 gas to leak inside the ring main unit. Secondly, traditional sealing structures rely on rubber rings with a fixed compression amount, which are prone to sealing failure due to temperature differences or vibrations. High humidity, salt spray and other environments will also accelerate material aging, and existing coatings are difficult to provide long-term protection. Utility Model Content

[0004] One advantage of this invention is that it provides a sealing structure for a solid insulation cabinet. By utilizing self-sealing components and temperature control supplementary components, the environmental adaptability of the ring main unit's sealing device is improved. Combined with a pressure balancing valve to maintain a slight positive pressure inside the cabinet, it completely solves the problems of condensation and corrosion in high humidity and salt spray environments. At the same time, the self-sealing components can automatically seal the sealing strips that have cracked due to aging, thus extending the life of the sealing structure, reducing the time required for manual maintenance, making it suitable for various harsh environments, and reducing operation and maintenance costs.

[0005] To achieve at least one of the above advantages of this utility model, this utility model provides a sealing structure for a solid insulation cabinet. The solid insulation cabinet includes a frame and several electrical functional components disposed inside the cabinet. Several cable inlets and sealing grooves are provided on the cabinet. A sealing sleeve structure is provided at the cable inlet and a sealing strip structure is provided at the sealing groove.

[0006] The sealing sleeve structure is equipped with a temperature control compensation component, which will produce thermal expansion and contraction when subjected to temperature changes; the sealing strip structure is equipped with a self-sealing component, which will release a repair agent after cracking, and the repair agent will form an elastic seal after curing.

[0007] According to one embodiment of the present invention, the sealing sleeve structure includes an annular sealing sleeve, a through hole in the middle of the sealing sleeve, two layers of annular edges on the outer surface of the sealing sleeve, and a gap between the two layers of annular edges.

[0008] According to one embodiment of the present invention, the sealing sleeve is made of EPDM rubber, and an expansion bladder is provided inside the sealing sleeve, which is filled with silicone gel.

[0009] According to one embodiment of the present invention, the sealing strip structure is made of fluororubber, and a plurality of microcapsules are disposed inside the sealing strip structure, the microcapsules being filled with a repair agent.

[0010] According to one embodiment of the present invention, the cabinet includes a frame, a top plate is provided on the upper part of the frame, side plates are provided on the sides of the frame, and a front panel is provided on the front part of the frame. Sealing strip structures are provided between the frame and the top plate, side plates and front panel. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0013] Figure 3 This is an enlarged schematic diagram of the sealing sleeve structure of this utility model;

[0014] Figure 4 This is an enlarged schematic diagram of the sealing strip structure of this utility model;

[0015] In the attached diagram: 1. Frame, 2. Side plate, 3. Top plate, 4. Front panel, 5. Sealing strip assembly, 6. Sealing sleeve assembly, 41. Lower plate, 42. Upper plate, 51. Sealing strip, 52. Microcapsule, 53. Crack, 54. Repair agent, 61. Through hole, 62. Expansion bladder, 63. Ring edge. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description will be provided in conjunction with the appendix of this utility model. Figure 1 ~Attached Figure 4 The present invention will be described in more detail below.

[0017] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0018] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0019] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0020] This utility model provides a sealing structure for a solid insulation cabinet. The solid insulation cabinet includes a frame and several electrical functional components disposed inside the cabinet. The cabinet has several cable inlets and sealing grooves. A sealing sleeve structure 6 is provided at each cable inlet, and a sealing strip structure 5 is provided at each sealing groove. The sealing sleeve structure 6 contains a temperature control compensation component, which expands and contracts with temperature changes. The sealing strip structure 5 contains a self-sealing component, which releases a repair agent 54 upon rupture. The repair agent 54 solidifies to form an elastic seal. The sealing sleeve structure 6 includes an annular sealing sleeve. A through hole 61 is provided in the middle, and two ring edges 63 are provided on the outer side of the sealing sleeve, with a gap between the two ring edges 63; the sealing sleeve is made of EPDM rubber, and an expansion bladder 62 is provided inside the sealing sleeve, which is filled with silicone gel; the sealing strip structure 5 is made of fluororubber, and several microcapsules 52 are provided inside the sealing strip structure 5, which are filled with a repair agent 54; the cabinet includes a frame 1, a top plate 3 is provided on the upper part of the frame 1, side plates 2 are provided on the sides of the frame 1, and a front panel 4 is provided at the front of the frame 1; sealing strip structures 5 are provided between the frame 1 and the top plate 3, side plates 2, and front panel 4.

[0021] The first embodiment of this utility model is as follows:

[0022] A sealing structure for a solid insulation cabinet is disclosed. The solid insulation cabinet includes a frame and several electrical functional components disposed inside the cabinet. Several cable inlets and sealing grooves are provided on the cabinet. A sealing sleeve structure 6 is provided at the cable inlet, and a sealing strip structure 5 is provided at the sealing groove. The cable inlet is sealed by the sealing sleeve structure 6. Its outer side contacts the frame and its inner side contacts the cable to form a seal. The cabinet includes a frame 1. A top plate 3 is provided on the upper part of the frame 1. Side plates 2 are provided on the sides of the frame 1. A front panel 4 is provided at the front of the frame 1. The front panel 4 includes an upper plate 42 and a lower plate 41, which are used to close the upper cavity and the lower cavity of the cabinet, respectively. Sealing strip structures 5 are provided between the frame 1 and the top plate 3, side plates 2 and front panel 4 to seal and prevent leakage from the gaps between the frame 1 and the top plate 3, side plates 2 and front panel 4.

[0023] The sealing sleeve structure 6 is internally equipped with a temperature control compensation component, which will generate thermal expansion and contraction effects when subjected to temperature changes. The sealing sleeve structure 6 includes an annular sealing sleeve with a through hole 61 in the middle through which the cable passes. Two ring edges 63 are provided on the outer surface of the sealing sleeve, with a gap between the two ring edges 63. This gap clamps the plate of the frame, thus forming a sealing structure. Under normal circumstances, this sealing structure can achieve a seal. However, when the temperature changes, the cable sheath and metal material will undergo slight morphological and volume changes. These changes will not have a significant impact on the seal under other circumstances, but in the ring main unit, because it is sealed with SF6 gas, even a small gap can leak. Although the leakage amount is small, over time, leakage will still affect the safe use of the ring main unit. To solve this problem... The sealing sleeve is made of EPDM rubber, and an expansion bladder 62 is provided inside the sealing sleeve, which surrounds the entire cable inlet. The expansion bladder 62 is filled with silicone gel, which is based on silicone resin and doped with nano-silica particles to improve its thermal conductivity and mechanical stability. This makes the silicone gel more thermally conductive than EPDM rubber. A thermoresponsive polymer is introduced into the silicone gel, preferably poly(N-isopropylacrylamide), which undergoes a volume phase change when a critical temperature is reached. In this embodiment, when the ambient temperature is below the threshold, the polymer in the silicone gel shrinks, and the gel volume decreases, avoiding a drop in sealing pressure due to low-temperature catalysis and maintaining overall elasticity to keep the seal intact. When the temperature rises, the polymer chains extend and absorb free silicone oil between the nanoparticles, and the gel volume expands, filling the gaps caused by the thermal expansion of the metal parts.

[0024] The sealing strip structure 5 is made of fluororubber, and contains several microcapsules 52. Each microcapsule 52 is filled with a repair agent 54. Upon rupture, the repair agent 54 is released and, after curing, forms an elastic seal. Specifically, the microcapsules 52 are spherical capsules with a diameter of 50-100 micrometers, with a polyurethane shell, uniformly dispersed within the fluororubber-supported sealing strip 51. Liquid siloxane repair agent 54 is filled inside the microcapsules 52. When cracks 53 appear in the sealing material due to mechanical wear, thermal stress, or aging, the cracks expand, causing the microcapsules 52 to rupture and release the liquid siloxane repair agent 54. The liquid siloxane spreads along the surface of the crack 53 and penetrates into the interior. Upon contact with moisture in the air, it undergoes a hydrolysis-condensation reaction, generating a three-dimensional cross-linked silicone rubber network. After curing, this forms a dense elastomer, which, together with the fluororubber, forms a physical-chemical bond, creating a second seal.

[0025] Preferably, the liquid siloxane repair agent 54 can be α,ω-dihydroxypolydimethylsiloxane, which forms a colorless and transparent solid after curing.

[0026] It should be noted that the terms "first, second, and third" used in this utility model are for descriptive purposes only and do not indicate any order. They should not be construed as indicating or implying relative importance, and can be interpreted as names.

[0027] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the principles, the implementation of the present invention may have any modifications or variations.

Claims

1. A sealing structure of a solid insulation switchgear, the solid insulation switchgear comprising a frame body and a plurality of electrical functional components arranged inside the frame body, characterized in that: The cabinet body is provided with a plurality of cable entrances and sealing grooves, the cable entrances are provided with sealing sleeve structures, and the sealing grooves are provided with sealing strip structures; The sealing sleeve structure is internally provided with a temperature control compensation component which will produce thermal expansion and cold shrinkage effects when subjected to temperature changes; the sealing strip structure is internally provided with a self-closing assembly which will release a repairing agent after being broken, and the repairing agent will form an elastic sealing body after solidification.

2. The sealed structure of a solid insulation switchgear according to claim 1, characterized in that: The sealing sleeve structure comprises an annular sealing sleeve, the middle part of the sealing sleeve is provided with a through hole, and the outer side of the sealing sleeve is provided with two layers of annular edges, and a gap is arranged between the two layers of annular edges.

3. The sealed structure of a solid insulation switchgear according to claim 2, characterized in that: The sealing sleeve is made of EPDM rubber, and the sealing sleeve is internally provided with an expansion capsule filled with a silica-based gel.

4. The sealed structure of a solid insulation switchgear according to claim 1, characterized in that: The sealing strip structure is made of fluororubber, and the sealing strip structure is internally provided with a plurality of microcapsules filled with a repairing agent.

5. The sealed structure of a solid insulation switchgear according to claim 1, characterized in that: The cabinet body comprises a frame, the upper part of the frame is provided with a top plate, the side of the frame is provided with a side plate, the front of the frame is provided with a front panel, and the frame is provided with a sealing strip structure between the top plate, the side plate and the front panel.

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