General dustproof device for GIS equipment flange butt joint

Abstract

The utility model discloses a general type dustproof device for GIS equipment flange butt joint, including inner support mechanism and flexible outer skin, inner support mechanism includes support frame and flexible inner skin, and flexible inner skin is supported by a plurality of support frames, and is closed or opened in the circumference and is adjusted, adjacent support frame is adjusted to be close or away in the circumference, to make flexible inner skin in the circumference and close the diameter size reduces or increases, when using, the flexible inner skin of inner support mechanism is correspondingly set in the flange pipe of GIS equipment, and the flexible outer skin is supported by the support mechanism and forms the cover and is located in the overhauling chamber of GIS equipment flange pipe, and the flexible outer skin is closed or opened in the circumference and is adjusted, and the end of flexible outer skin corresponds to seal, and the overhauling mouth is seted up on the flexible outer skin, can low -cost, can repeatedly use, and the versatility is strong, and many scene is applicable, and the closed nature is good, and the storage is convenient, and the construction is nimble and convenient, and can be matched small -sized dust removal dehumidification equipment control closed space in working environment parameter.

Description

Technical Field

[0001] This utility model relates to the field of tools for GIS equipment assembly, specifically to a universal dustproof device for flange connection of GIS equipment. Background Technology

[0002] Gas-insulated switchgear, commonly known domestically as GIS, is a type of switchgear commonly used in substations. It integrates various high-voltage components such as circuit breakers, disconnectors, and instrument transformers using gas as the insulating medium, and then assembles them completely in a closed metal casing. The equipment has strict requirements for working environment parameters such as dust and humidity inside the closed metal casing. It is mostly installed outdoors, and the common voltage levels cover 110kV~500kV.

[0003] On-site maintenance or expansion of equipment requires opening the sealed outer shell within a certain range. The internal maintenance components, conductors, and part of the metal shell cavity are directly connected to the external environment, making them in complete contact with the outside air. Dust, moisture, and other pollutants in the outside air will inevitably be brought into the metal shell, thus contaminating the internal environment. If not handled properly, this will seriously threaten the safety of the equipment's live operation after it is sealed.

[0004] Therefore, the working environment during equipment maintenance and expansion has strict requirements for cleanliness and humidity. Unlike the situation when installing new equipment, where a large, integrated dustproof shed equipped with fresh air, dust removal, and dehumidification devices can be temporarily erected to fully accommodate the equipment to be installed, the maintenance and expansion of equipment is carried out on existing old equipment. The structure and size of equipment with different voltage levels, models, manufacturers, and installation layouts vary. The opening locations and disassembly / reassembly interfaces also vary. Equipment maintenance and expansion often face complex working conditions and scenarios such as limited space, nearby electrified equipment, and crisscrossing existing equipment layouts, making it impossible to use the method of building a temporary cleanroom as a whole.

[0005] Current main technical solutions and their main problems:

[0006] 1) No dust control measures are taken at the equipment maintenance and expansion site. The working environment is exactly the same as the surrounding environment. The uncontrolled working environment cannot meet the requirements of the construction environment. There are serious safety hazards after the equipment maintenance and expansion.

[0007] 2) Temporary use of tarpaulins to enclose and cover equipment maintenance and expansion areas to form a simple and relatively enclosed work space for workers only provides a simple physical isolation from the outside space. It can block some external dust, but the working environment is far from meeting the standards.

[0008] 3) Each time, a relatively standardized temporary inflatable or profile frame dustproof shed is made for a specific maintenance or expansion area to form a relatively closed working space for workers and to assist in dust removal and dehumidification measures. Each maintenance operation is a special dustproof shed for single use. The on-site working conditions are complex and the construction is inconvenient. It cannot meet the needs of multiple scenarios, and the cost per use is high and management is inconvenient.

[0009] 4) Each time a small dust cover with a specific shape and size is made for the cylindrical metal shell straight-through flange sealing part during equipment maintenance and expansion, the sealing area is completely isolated from the outside. The operator puts his hand into the dust cover to carry out the sealing work through a special sleeve. However, the same small dust cover cannot be used for flange sealing of different shapes and sizes or flange sealing of different structural combinations. The same set of small dust covers cannot solve the problem of multi-scenario applicability, and the cost performance is low. In addition, no dust removal and dehumidification measures are taken in the sealing area of ​​the small dust cover, which limits its application and promotion.

[0010] Therefore, in order to effectively eliminate the many problems mentioned above in the current solutions or existing technical measures for controlling the working environment during on-site maintenance and expansion of gas-insulated combined electrical equipment flange connection, there is a need for a low-cost, reusable, versatile, multi-scenario applicable, well-sealed, easy-to-store, flexible and convenient-to-build, and compatible miniaturized dust removal and dehumidification equipment for controlling the working environment parameters in the enclosed space for flange connection of GIS equipment. Utility Model Content

[0011] In view of this, the purpose of this utility model is to overcome the defects in the prior art and provide a universal dustproof device for flange docking of GIS equipment. It is low-cost, reusable, versatile, applicable to multiple scenarios, has good sealing, is easy to store, flexible and convenient to build, and can be equipped with miniaturized dust removal and dehumidification equipment to control the working environment parameters in the enclosed space.

[0012] This utility model discloses a universal dustproof device for flange connection of GIS equipment, comprising an inner support mechanism and a flexible outer skin. The inner support mechanism includes a support frame and a flexible inner skin. The support frame has an inner support end, an outer support end, and a skeleton connecting the inner and outer support ends. There are several support frames, and the flexible inner skin is supported by several of these support frames and is circumferentially adjustable to close or open. Adjacent support frames are circumferentially adjusted to move closer or further apart, so that the diameter of the flexible inner skin when closed in the circumferential direction decreases or increases. In use, the flexible inner skin of the inner support mechanism is fitted onto the flange tube of the GIS equipment. The flexible outer skin, supported by the support mechanism, forms a maintenance chamber covering the flange tube of the GIS equipment, and is circumferentially adjustable to close or open. The ends of the flexible outer skin are sealed by sealing elements. An inspection port is provided on the flexible outer skin.

[0013] Furthermore, the support frame is Z-shaped, with the upper and lower ends of the Z-shape serving as the outer support end and the inner support end, respectively, and the middle part of the Z-shape serving as the skeleton to connect the inner support end and the outer support end.

[0014] Furthermore, the flexible inner skin is continuously bent in a corrugated shape along its length, and the cross-section of the flexible inner skin is a "Z" shape consistent with the shape of the support frame. Several of the support frames are correspondingly embedded into the corrugated grooves of the flexible inner skin to form support for the flexible inner skin.

[0015] Furthermore, the flexible inner skin has male and female Velcro fasteners respectively provided at both ends along its length.

[0016] Furthermore, it also includes an inner limiting band, which is used to limit the flexible inner skin to the flange tube of the corresponding GIS equipment. In use, the inner limiting band binds the flexible inner skin to the outer circumferential surface of the flange tube of the GIS equipment.

[0017] Furthermore, the light transmittance of the flexible outer skin exceeds 85%.

[0018] Furthermore, the sealing element includes an outer limiting band, which is used to limit the flexible outer skin to the flange tube of the corresponding GIS equipment. In use, the outer limiting band binds the flexible outer skin to the circumferential outer surface of the flange tube of the GIS equipment.

[0019] Furthermore, a protective channel is provided inside the inspection port, and the protective channel is controlled to open or close.

[0020] Furthermore, the support frame is detachable from the inner skin.

[0021] Furthermore, the flexible outer skin is provided with functional openings, which are controlled to open and close.

[0022] The beneficial effects of this utility model are as follows: The universal dustproof device for flange connection of GIS equipment disclosed in this utility model has the following advantages:

[0023] (1) Compared with the solutions of not taking any dust prevention measures and temporarily using simple tarpaulin enclosures for dust prevention, this patent can effectively solve the problem of isolating the work area from the outside world when the metal shell flange of the equipment is connected and sealed during on-site maintenance and expansion of gas-insulated combined electrical equipment in substations. It can effectively block dust, moisture and other pollutants from the external environment from contaminating the work area and maintenance parts. It can also be equipped with miniaturized dust removal and dehumidification equipment to purify the working environment of the work area, fully meeting the maintenance process requirements. Furthermore, the maintenance chamber is smaller, the working environment is purified faster, and the construction cost is reduced.

[0024] (2) Compared with the temporary dustproof sheds for personnel to carry out work in the working environment, this patent is a non-special disposable consumable that can be reused, occupies little space, is suitable for complex working conditions such as narrow spaces, is highly versatile and low in cost, and is convenient to build, dismantle and store. Moreover, since no personnel enter the internal working environment, there is no pollution such as water, sweat and microorganisms expelled by human breathing and sweating, making it easier to control the air cleanliness of the working environment. It is also smaller and more compact in structure.

[0025] (3) Compared with existing dustproof devices that are only applicable to straight pipe connections of a specific diameter, this patent relies on a unique, arbitrarily extendable accordion-style support structure that can be bent and deformed into an embracing support structure of any diameter within a certain size range. It can also be bent into an embracing support structure with a larger size range by splicing to increase the length of the accordion bracket. Combined with modular dustproof enclosure cloths of splicable length and width, it can form cylindrical dustproof devices of different diameters and lengths. It can not only meet the dustproof needs of a specific straight pipe connection under complex working conditions such as narrow spaces, but also be applicable to applications spanning 110kV~500kV. For on-site maintenance and expansion of gas-insulated combined electrical equipment in substations at kV or even higher voltage levels, the environmental protection (dust prevention) requirements for flange connection and sealing construction of cylindrical shells (through pipes) of various diameters can be met. Furthermore, by combining different numbers and sizes of embracing support structures and modular dustproof barriers such as "I", "L", "T" and "+" shapes, it is possible to meet the needs of more complex working conditions and multi-scenario applications, such as straight-through and tee-through connections, four-way connections, bend-through connections, and oblique-through connections. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a top view of the structure of this utility model. Figure 1 ;

[0028] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal support mechanism of this utility model;

[0030] Figure 4 This is a schematic diagram of the structure used in the support frame of this utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0032] Figure 6 This is a schematic diagram of the structure of the present invention. Figure 3 ;

[0033] Figure 7 This is a schematic diagram of the structure of the present invention. Figure 4 ;

[0034] Figure 8 This is a schematic diagram of the structure of the present invention. Figure 5 . Detailed Implementation

[0035] Figure 1 As shown in the figure, the universal dustproof device for flange docking of GIS equipment in this embodiment includes an inner support mechanism and a flexible outer skin 001. In use, the inner support mechanism is set on the corresponding preset GIS equipment flange pipe 100 to support the flexible outer skin 001, so that the flexible inner skin 002 covers the corresponding maintenance location to form a maintenance chamber, which is conducive to creating a more controllable working environment. The structure is compact, easy to use, more miniaturized and easy to carry, and can be reused.

[0036] In this embodiment, the flexible outer skin 001 is made of a flexible material with certain extensibility. The flexible material can be folded and stored without damaging the structure or performance of the flexible outer skin 001, thus meeting the requirement for convenient on-site transport. The light transmittance of the flexible outer skin 001 exceeds 85%. For example, existing materials such as PET or TPU can achieve a light transmittance exceeding 85%. Higher light transmittance results in higher clarity and a better visual environment for operators, allowing direct observation and maintenance of GIS equipment flange connections, improving maintenance efficiency, and simplifying the structure. Alternatively, if the flexible outer skin 001 is made of a material with low light transmittance, external electronically controlled visual equipment can be used to enter the maintenance chamber for observation and processing, or a robotic arm equipped with visual equipment can be used directly for pipeline maintenance operations; these details will not be elaborated upon here. Preferably, the flexible outer skin 001 is made of a soft and transparent TPU material, and is a single rectangular sheet. The flexible outer skin 001 is adjustable to close or open circumferentially on the GIS equipment flange. Preferably, at both ends of the flexible outer skin 001 in the width direction (corresponding to the expansion / contraction direction circumferentially on the GIS equipment flange in this design), there are corresponding hook and loop fasteners (male and female) to achieve the purpose of adjustment for opening or closing. It should be understood that the hook and loop fasteners are arranged along the entire length of the corresponding edge of the flexible outer skin 001 to improve sealing performance and connection reliability. This structure has good operability and good sealing performance, ensuring a tight joint and reducing contamination of the internal maintenance chamber environment. Of course, if... Figures 5-8As shown, corresponding to flange connection structures of GIS equipment with different shapes, this solution can include multiple flexible outer skins 001 to accommodate different situations. These can be self-adhesive, or two flexible outer skins 001 can be interlocked to form an adhesive seal, or multiple flexible outer skins 001 can be bonded together to create a seal. This improves the versatility of the entire device to handle different maintenance scenarios, which will not be elaborated further here. Regarding the adjustable opening and closing structure of the flexible outer skins 001, in practical applications, it can also be a hook-and-loop fastener or a cleanable adhesive strip, depending on the desired purpose, which will not be elaborated further here.

[0037] In this embodiment, the end of the flexible outer skin 001 is sealed by a sealing element to relatively separate the maintenance chamber from the external environment and ensure the cleanliness of the maintenance environment. In this solution, the sealing element includes an outer limiting band 101, which is used to limit the flexible outer skin 001 to the flange tube of the corresponding GIS equipment. In use, the outer limiting band 101 binds the flexible outer skin 001 to the circumferential outer surface of the flange tube of the GIS equipment. The outer limiting band 101 can be a strap, cable tie, or elastic band, etc. Preferably, the outer limiting band 101 in this solution is an elastic band. In use, the flexible outer skin 001 is simply bound to the flange tube of the corresponding GIS equipment. It has a certain elastic force so that after the flexible outer skin 001 is limited to the flange tube of the corresponding GIS equipment, it can provide a continuous fastening force, thereby improving the sealing capability of the maintenance chamber.

[0038] In this embodiment, an inspection port 102 is provided on the flexible outer skin 001, and a protective channel is provided inside the inspection port 102. The protective channel is controlled to open or close. The inspection port 102 is the inspection hand opening, and the protective channel is a sleeve-like structure arranged on the flexible outer skin 001. Sleeve-like structures are quite common and will not be described in detail in this solution. The inlet of the sleeve-like structure is open, and the outlet is wrapped with an elastic element. When not in use, the outlet is sealed. When in use, the arm is inserted from the inlet and passes through the outlet. The arm is pressed and sealed by the elastic element, so that the internal inspection chamber environment is not affected during the inspection process, thus improving the stability of the inspection environment. In this solution, the inspection ports 102 are several evenly distributed around the circumference of the GIS equipment flange after the flexible outer skin 001 covers the flange, and there are at least four, which can be used for multi-directional and multi-angle inspection. This will not be described in detail here. The controlled opening or closing of the protective passage can also be achieved using existing technologies such as opening and closing doors and windows or valve plates, which will not be elaborated here.

[0039] In this embodiment, a functional port 103 is also provided on the flexible outer skin 001. The functional port 103 is controlled to open and close. The functional port 103 can be opened on the flexible outer skin 001 to avoid the maintenance port 102. Preferably, it is opened near the joint where the male and female Velcro fasteners of the flexible outer skin 001 are glued together, so as to further improve the effectiveness of the treatment of the maintenance chamber environment. This will not be elaborated further. The functional port 103 is used to connect to existing dust removal and dehumidification fresh air equipment, so as to quickly bring the environment of the maintenance chamber to a preset standard. This will not be elaborated further. Of course, the dust removal and dehumidification fresh air equipment can also be directly connected to the maintenance port 102, which can eliminate the need for the arrangement of the functional port 103. This will not be elaborated further. In this solution, the functional port 103 serves as the interface for the clean fresh air duct of a small dust removal and dehumidification fresh air equipment. The functional port 103 is also provided with the sleeve-like structure arranged at the maintenance port 102 to meet the usage requirements. This will not be elaborated further.

[0040] In this embodiment, the inner support mechanism includes a support frame 003 and a flexible inner skin 002. The support frame 003 has an inner support end, an outer support end, and a skeleton connecting the inner support end and the outer support end. There are several support frames 003, and the flexible inner skin 002 is supported by several of the support frames 003 and is adjusted to close or open circumferentially. Adjacent support frames 003 are adjusted to move closer or further apart circumferentially, so that the diameter of the flexible inner skin 002 when closed circumferentially decreases or increases. In use, the flexible inner skin 002 of the inner support mechanism is fitted onto the flange pipe of the GIS equipment. The flexible outer skin 001 is supported by the support mechanism to form a maintenance chamber covering the flange pipe 100 of the GIS equipment. It should be understood that the inner support mechanisms are arranged in at least a one-to-one correspondence on a single GIS equipment flange pipe, for example... Figure 2 , Figures 6-8As shown, each set of internal support mechanisms is correspondingly installed on a GIS equipment flange pipe, and they are all simultaneously covered inside the flexible outer skin to form support for it. Of course, depending on the situation, multiple sets of internal support mechanisms can also be arranged on a GIS equipment flange pipe, and they are all covered by the flexible outer skin to form support for it when in use, which will not be elaborated here. The purpose of the support frame 003 is to support the flexible outer skin 001 when it covers the corresponding GIS equipment flange pipe 100. The function of the flexible inner skin 002 is to connect several support frames 003 to form an accordion-like structure with variable unfolded dimensions. At the same time, it can also avoid direct contact between the support frame 003 and the flexible outer skin 001, reduce material damage, and provide better protection. The flexible inner skin 002 is made of flexible material and has a certain degree of extensibility. Similar to the flexible outer skin 001, it has the advantage of portability. The flexible inner skin 002 has a wider range of material choices and can be extended to woven fabrics or rubber products. In this solution, the flexible inner skin 002 is PVC mesh cloth, which has a certain mechanical strength and higher chemical stability. It can work with the support frame 003 to provide a more stable support structure, which is beneficial to the application of the flexible outer skin 001.

[0041] In this embodiment, as Figure 3As shown, the support frame 003 is Z-shaped, with the upper and lower ends of the Z-shape serving as the outer and inner support ends, respectively. The middle part of the Z-shape acts as a skeleton connecting the inner and outer support ends. The support frame 003 can also be C-shaped, L-shaped, or swastika-shaped, depending on the desired support capacity; details will not be elaborated here. This design sets the support frame 003 into a Z-shaped structure. In use, the inner support end is supported by the flange pipe of the GIS equipment, and the outer support end is supported by the outer skin, resulting in better support stability. The flexible inner skin 002 is continuously corrugated along its length, providing even better support capacity. The cross-section of the flexible inner skin 002 is Z-shaped, consistent with the shape of the support frame 003. Several support frames 003 are correspondingly embedded into the corrugated grooves of the flexible inner skin 002, forming support for the flexible inner skin 002. In use, the support frame 003 can be extended by stretching the flexible inner skin 002. The support frame 003 surrounds the corresponding GIS equipment flange pipe 100, making it convenient and quick to use. The cooperation between the support frame 003 and the flexible inner skin 002 allows the support mechanism to have a large expansion ratio, reducing the space occupied during compression. It can be used with GIS equipment flange pipes 100 of different diameters. The support frame 003 described in this solution is detachable from the inner skin, providing a larger expansion ratio and accommodating GIS equipment flange pipes 100 with larger radial dimensions. Furthermore, its detachability further reduces the carrying thickness of the inner skin, improving portability. Generally, the support frames 003 embedded in the flexible inner skin 002 are equidistantly arranged to improve the uniformity of structural support force. In this solution, the support frame 003 is made of PVC, possessing lightweight characteristics that facilitate portability.

[0042] In this embodiment, the two ends of the flexible inner skin 002 in the length direction (corresponding to the expansion and contraction direction in the circumferential direction of the GIS equipment flange in this solution) are respectively provided with adhesive hook and loop fastener male and female fasteners. When in use, they can be directly glued together to form a cylindrical structure that wraps around the GIS equipment flange pipe 100. The structure of the adhesive joint is the same as that of the flexible outer skin 001 in this solution, and has the same advantages, so it will not be described again here. The design of the hook and loop fastener male and female fasteners at both ends of the flexible inner skin 002 in the width direction can also increase the number of flexible inner skins 002 used to accommodate GIS equipment flange pipes 100 with different diameters. Of course, if the structure is a hook and loop fastener or a clip connection, the purpose of increasing or decreasing the number can also be achieved, so it will not be described again here. In actual use, depending on the diameter of the flange pipe 100 of the GIS equipment and the application scenario, this type of connection structure may not be required, provided that reliable support is met. The corrugated grooves at the end edge of the flexible inner skin 002 can be directly engaged. Due to its built-in support frame 003 and its material properties, the limiting purpose can also be achieved by using the friction between the grooves, which will not be elaborated here.

[0043] In this embodiment, an inner limiting band 201 is also included. The inner limiting band 201 is used to limit the flexible inner skin 002 to the flange tube of the corresponding GIS equipment. In use, the inner limiting band 201 binds the flexible inner skin 002 to the circumferential outer surface of the flange tube of the GIS equipment. The inner limiting band 201 and the outer limiting band 101 in this solution are the same, both being elastic bands. In use, the flexible inner skin 002 is bound to the flange tube of the corresponding GIS equipment. It has a certain elastic force so that after the flexible outer skin 001 is limited to the flange tube of the corresponding GIS equipment, it can provide a continuous fastening force, thereby improving the support reliability.

[0044] This solution also has the following advantages:

[0045] (1) Compared with the solutions of not taking any dust prevention measures and temporarily using simple tarpaulin enclosures for dust prevention, this patent can effectively solve the problem of isolating the work area from the outside world when the metal shell flange of the equipment is connected and sealed during on-site maintenance and expansion of gas-insulated combined electrical equipment in substations. It can effectively block dust, moisture and other pollutants from the external environment from contaminating the work area and maintenance parts. It can also be equipped with miniaturized dust removal and dehumidification equipment to purify the working environment of the work area, fully meeting the maintenance process requirements. Furthermore, the maintenance chamber is smaller, the working environment is purified faster, and the construction cost is reduced.

[0046] (2) Compared with the temporary dustproof sheds for personnel to carry out work in the working environment, this patent is a non-special disposable consumable that can be reused, occupies little space, is suitable for complex working conditions such as narrow spaces, is highly versatile and low in cost, and is convenient to build, dismantle and store. Moreover, since no personnel enter the internal working environment, there is no pollution such as water, sweat and microorganisms expelled by human breathing and sweating, making it easier to control the air cleanliness of the working environment. It is also smaller and more compact in structure.

[0047] (3) Compared with existing dustproof devices that are only applicable to straight pipe connections of a specific diameter, this patent relies on a unique, arbitrarily extendable accordion-style support structure that can be bent and deformed into an embracing support structure of any diameter within a certain size range. It can also be bent into an embracing support structure with a larger size range by splicing to increase the length of the accordion bracket. Combined with modular dustproof enclosure cloths of splicable length and width, it can form cylindrical dustproof devices of different diameters and lengths. It can not only meet the dustproof needs of a specific straight pipe connection under complex working conditions such as narrow spaces, but also be applicable to applications spanning 110kV~500kV. For on-site maintenance and expansion of gas-insulated combined electrical equipment in substations at kV or even higher voltage levels, the environmental protection (dust prevention) requirements for flange connection and sealing construction of cylindrical shells (through pipes) of various diameters can be met. Furthermore, by combining different numbers and sizes of embracing support structures and modular dustproof barriers such as "I", "L", "T" and "+" shapes, it is possible to meet the needs of more complex working conditions and multi-scenario applications, such as straight-through and tee-through connections, four-way connections, bend-through connections, and oblique-through connections.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A universal dustproof device for flange connection of GIS equipment, characterized in that: It includes an inner support mechanism and a flexible outer skin; the inner support mechanism includes a support frame and a flexible inner skin; the support frame has an inner support end, an outer support end, and a skeleton connecting the inner support end and the outer support end; there are several support frames, and the flexible inner skin is supported by several support frames and is adjusted to close or open in the circumferential direction; The adjacent support frames are adjusted circumferentially to move closer or further apart, so that the diameter of the flexible inner skin when closed circumferentially decreases or increases; in use, the flexible inner skin of the inner support mechanism is fitted onto the flange pipe of the GIS equipment; the flexible outer skin is supported by the support mechanism to form a maintenance chamber covering the flange pipe of the GIS equipment, and the flexible outer skin is adjusted circumferentially to close or open; the ends of the flexible outer skin are sealed by sealing elements; and maintenance ports are provided on the flexible outer skin.

2. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The support frame is Z-shaped, with the upper and lower ends of the Z-shape serving as the outer and inner support ends, respectively, and the middle part of the Z-shape serving as the skeleton to connect the inner and outer support ends.

3. The universal dustproof device for flange connection of GIS equipment according to claim 2, characterized in that: The flexible inner skin is continuously bent in a corrugated shape along its length, and the cross-section of the flexible inner skin is a "Z" shape consistent with the shape of the support frame. Several of the support frames are correspondingly embedded in the corrugated grooves of the flexible inner skin to form support for the flexible inner skin.

4. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The flexible inner skin has male and female Velcro fasteners respectively attached to both ends along its length.

5. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: It also includes an inner limiting band, which is used to limit the flexible inner skin to the flange tube of the corresponding GIS equipment. In use, the inner limiting band binds the flexible inner skin to the outer circumferential surface of the flange tube of the GIS equipment.

6. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The light transmittance of the flexible outer skin exceeds 85%.

7. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The sealing element includes an outer limiting band, which is used to limit the flexible outer skin to the flange tube of the corresponding GIS equipment. In use, the outer limiting band binds the flexible outer skin to the circumferential outer surface of the flange tube of the GIS equipment.

8. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The inspection port is equipped with a protective passage, which is controlled to open or close.

9. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The support frame is detachable from the inner skin.

10. The universal dustproof device for flange connection of GIS equipment according to claim 1, characterized in that: The flexible outer skin is also provided with functional openings, which are controlled to open and close.

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