Fireproof and explosion-proof plugging and isolation structure for converter valve hall opening

Abstract

The utility model discloses a kind of fireproof anti-explosion plugging isolation structures for converter valve hall portal, including middle plugging structure;Respectively fixed and cover the front and rear two sides surface of middle plugging structure, fire-facing surface plugging structure and backfire surface plugging structure;Middle plugging structure, fire-facing surface plugging structure and backfire surface plugging structure are opened with converter valve side sleeve pipe hole in the middle lower part of the overall structure of composition;Middle plugging structure includes support keel frame and the middle filler filled in support keel frame;Fire-facing surface plugging structure and backfire surface plugging structure all include multiple plugging plates arranged parallel to middle plugging structure.The fireproof anti-explosion plugging isolation structure designed in the utility model can be used for converter valve hall portal, with reliable anti-explosion and fireproof performance, required installation space is small and construction process difficulty is low.

Description

Technical Field

[0001] This utility model relates to the technical field of safety protection equipment for converter stations, specifically to a fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall. Background Technology

[0002] During the operation of ultra-high voltage direct current converter stations, fireproof and explosion-proof sealing and isolation between the converter transformer and the valve hall is a core guarantee measure to resist potential explosion impacts and the risk of fire spread, and to ensure the safe and stable operation of equipment within the station. Currently, the mainstream solutions for fireproof and explosion-proof sealing and isolation structures mainly include separate structures that separate explosion-proof and fireproof components, as well as integrated structures composed of steel profiles, fiber cement composite explosion-proof panels, ultra-high performance concrete, fire-resistant panels, and filling materials.

[0003] The split structure separating explosion-proof and fire-resistant components offers advantages in achieving both performance. The combined structure can effectively meet the explosion-proof and fire-resistant performance requirements of converter stations. However, this split structure has significant drawbacks in practical applications. It requires separate installation layouts for the explosion-proof and fire-resistant components, resulting in extremely high space requirements. In converter station scenarios with limited space, installation is difficult and may not meet the necessary conditions, severely limiting its application scope.

[0004] The overall structure employs a multi-material composite design, integrating explosion-proof and fire-resistant functions into one unit, and features convenient installation, effectively improving construction efficiency. However, the overall structure also faces several technical bottlenecks. On the one hand, the explosion-proof performance of the overall structure is inferior to that of the split structure, making it difficult to withstand high-intensity explosive impacts. On the other hand, the overall structure has extremely strict requirements for production and construction processes. From material proportioning and composite processes to the precision control of on-site construction, deviations in any link may affect the performance of the overall structure, leading to a reduction in its reliability and stability.

[0005] Therefore, there is an urgent need to develop a fireproof and explosion-proof sealing and isolation structure that can effectively utilize limited installation space, has reliable explosion-proof and fireproof performance, and reduces the difficulty of production and construction processes, so as to meet the growing safety requirements of UHVDC converter stations. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the aforementioned background technology and provide a fireproof and explosion-proof sealing and isolation structure for converter valve hall openings that has reliable explosion-proof and fire-proof performance, requires little installation space, and has low construction difficulty.

[0007] To achieve this objective, the fireproof and explosion-proof sealing and isolation structure for the opening of the converter valve hall designed in this utility model includes a central sealing structure; a fire-facing sealing structure and a back-facing sealing structure that are fixed and cover the front and rear surfaces of the central sealing structure respectively; a converter valve side sleeve hole is opened in the lower middle part of the integral structure composed of the central sealing structure, the fire-facing sealing structure, and the back-facing sealing structure; the central sealing structure includes a supporting keel frame and a central filler material filled in the supporting keel frame; both the fire-facing sealing structure and the back-facing sealing structure include multiple layers of sealing plates arranged parallel to the central sealing structure.

[0008] Furthermore, the central filler includes a peri-hole filler that fills the space between the converter valve side sleeve hole and the supporting keel frame along the circumferential direction of the converter valve side sleeve hole, and a keel frame filler that fills the supporting keel frame but is located outside the area where the peri-hole filler is located.

[0009] Furthermore, the perforated filler includes aluminum silicate cotton and fireproof sealant arranged alternately along the circumferential direction of the perforation wall; the aluminum silicate cotton and fireproof sealant can maintain a gap of 100-150mm between the supporting keel frame made of non-magnetic material and the sleeve arranged in the side sleeve hole of the converter valve, thus preventing eddy current heating.

[0010] Furthermore, the keel frame filler includes a zirconium-containing aluminum silicate needled blanket; the zirconium-containing aluminum silicate needled blanket ensures the structural strength of the central sealing structure while enabling the central sealing structure to have high temperature resistance and blast resistance.

[0011] Furthermore, the fire-facing sealing structure includes a fire-facing fiber paper covering the front surface of the central sealing structure and a three-layer fire-facing sealing plate arranged parallel to the central sealing structure and layered and fixed on the fire-facing fiber paper.

[0012] Furthermore, the fire-facing three-layer sealing plate includes a fire-facing inorganic fireproof board, a fire-facing composite board, and a fire-facing metal explosion-proof panel, which are layered and fixed on the fire-facing fiber paper.

[0013] Furthermore, the back-facing sealing structure includes a back-facing fiber paper covering the rear surface of the central sealing structure and a three-layer back-facing sealing plate arranged parallel to the central sealing structure and layered and fixed on the back-facing fiber paper.

[0014] Furthermore, the three-layer sealing plate on the unexposed side includes an inorganic fireproof plate on the unexposed side, a composite plate on the unexposed side, and a metal explosion-proof panel on the unexposed side, which are layered and fixed on the fiber paper on the unexposed side.

[0015] Furthermore, the supporting keel frame includes one or more standard frames fixedly connected as an integral structure along the height direction of the central sealing structure, and one or more sets of perforated frames. Each set of perforated frames has a converter valve side sleeve hole in its middle. The disassembly-designed supporting keel frame can buffer the explosive impact in stages, preventing the supporting keel frame from being completely destroyed.

[0016] Furthermore, each set of the perforated skeletons includes at least two upper perforated skeletons and lower perforated skeletons arranged vertically.

[0017] The beneficial effects of this utility model are: through innovative material combinations and structural design, it effectively solves the problems of limited installation space, insufficient explosion-proof and fire-resistant performance, and complex construction process in ultra-high voltage DC converter stations, as detailed below:

[0018] 1. The central sealing structure, the fire-facing sealing structure, and the unfacing sealing structure form an integrated composite structure. Unlike split structures, there is no need to separately arrange explosion-proof and fireproof components, which greatly reduces the installation space requirements. It is especially suitable for compact scenarios such as converter stations, and solves the problem of limited application caused by insufficient installation space in split structures.

[0019] 2. The supporting keel frame adopts a detachable design with standard frame, upper perforated frame, and lower perforated frame, which can buffer the impact of explosion in stages to avoid overall damage; at the same time, the modular structure is easy to assemble on site, reducing construction difficulty and improving installation efficiency. Compared with the strict requirements for construction precision of the overall structure, it is easier to control the construction quality.

[0020] 3. The sealing structure of both the fire-facing and unfire-facing sides adopts a three-layer structure of "inorganic fireproof board + composite board + metal explosion-proof panel". The metal explosion-proof panel (such as steel plate) directly resists the explosion impact and absorbs energy through the rigidity of the material; the composite board enhances the overall structure and disperses the impact force; the inorganic fireproof board provides basic fire-resistant support while resisting explosion. The three layers work together to make the explosion resistance performance close to that of a split structure, making up for the shortcomings of the traditional integral structure in terms of explosion resistance.

[0021] 4. The perforated filling material (alumina silicate cotton and fireproof mortar) wraps the bushing hole of the converter transformer valve to isolate it from the high temperature generated by explosion or fire. At the same time, the non-magnetic supporting keel frame maintains a gap of 100-150mm with the bushing to prevent eddy current heating. The keel frame filling material (containing zirconium alumina silicate needled blanket) has both high strength and high temperature resistance. It can not only support the frame structure, but also form a heat insulation layer in the event of a fire to prevent the spread of fire and meet the long-term fire protection requirements of the converter station.

[0022] 5. The fiber paper and inorganic fireproof board on the fire-facing and unfire-facing sides form a double fire barrier. The fiber paper can block smoke and sparks, while the inorganic fireproof board slows down heat conduction through its low thermal conductivity, thereby reducing the rate of temperature rise on the unfire-facing side and ensuring the structure maintains its integrity in a fire.

[0023] 6. The material ratio and composite process are highly standardized (such as uniform filling of filler and layer-by-layer fixing of sealing plates), which reduces performance fluctuations caused by deviations in the construction process. Compared with the strict requirements of traditional integral structures, reliability is easier to guarantee. At the same time, the modular design facilitates later maintenance and replacement, reducing operation and maintenance costs.

[0024] 7. The integrated structure reduces the number of components and installation steps, effectively improving construction efficiency compared to the split structure; compared to ultra-high performance concrete, the processing technology of zirconium-containing aluminum silicate needled blanket is more stable. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the disclosed embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0026] Figure 1 A height-direction cross-sectional view of the fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall designed for this utility model;

[0027] Figure 2 for Figure 1 A magnified view of the filler around the central hole;

[0028] Figure 3 for Figure 1 Enlarged view of the infill material of the middle keel frame;

[0029] Figure 4 for Figure 1 Enlarged section views of the cross-sections of the fire-facing sealing structure and the unfacing sealing structure in the height direction;

[0030] Figure 5 This is a front view of the supporting keel frame in this utility model;

[0031] Figure 6 This is a schematic diagram of the assembly of the supporting keel frame in this utility model;

[0032] Among them, 1—fire-facing sealing structure (1.1—fire-facing fiber paper, 1.2—fire-facing inorganic fireproof board, 1.3—fire-facing composite board, 1.4—fire-facing metal explosion-proof panel), 2—middle sealing structure (2.1—supporting keel frame, 2.2—hole perimeter filler, 2.3—keel frame filler), 3—back-facing sealing structure (3.1—back-facing fiber paper, 3.2—back-facing inorganic fireproof board, 3.3—back-facing composite board, 3.4—back-facing metal explosion-proof panel), 4—converter valve side sleeve hole, 5—standard frame, 6—upper opening frame, 7—lower opening frame. Detailed Implementation

[0033] The technical solution (including preferred technical solution) of this utility model will be further described in detail below with reference to the accompanying drawings and by listing some optional embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model.

[0034] like Figure 1 As shown, in some embodiments, the fireproof and explosion-proof sealing and isolation structure for the converter valve hall opening designed by this utility model includes a central sealing structure 2; a fire-facing sealing structure 1 and a back-facing sealing structure 3 that are fixed and cover the front and rear surfaces of the central sealing structure 2 respectively; and a converter valve side sleeve hole 4 is opened in the lower middle part of the integral structure composed of the central sealing structure 2, the fire-facing sealing structure 1 and the back-facing sealing structure 3.

[0035] Example 1

[0036] A specific embodiment of the central sealing structure 2 is provided:

[0037] like Figure 1 —3 and Figure 5 As shown in Figure 6, the central sealing structure 2 includes a supporting keel frame 2.1 and a central filler material filled within the supporting keel frame 2.1.

[0038] The supporting keel frame 2.1 is made of stainless steel square tubing and includes a standard frame 5, an upper perforated frame 6, and a lower perforated frame 7, which are fixedly connected as a whole along the height direction of the central sealing structure 2. The converter valve side sleeve hole 4 is opened on the upper perforated frame 6 and the lower perforated frame 7. The disassembly-designed supporting keel frame 2.1 can buffer the explosive impact in stages to prevent the supporting keel frame 2.1 from being completely destroyed.

[0039] The central filling material includes peri-hole filler 2.2, which fills the space between the converter valve side bushing hole 4 and the supporting frame 2.1 along the circumferential direction of the converter valve side bushing hole 4, and frame filler 2.3, which fills the supporting frame 2.1 but is located outside the area of ​​peri-hole filler 2.2. Peri-hole filler 2.2 consists of alternating layers of aluminum silicate cotton and fireproof sealant arranged circumferentially along the hole wall; the aluminum silicate cotton and fireproof sealant maintain a 100-150mm gap between the supporting frame 2.1, made of non-magnetic material, and the bushing arranged in the converter valve side bushing hole 4, preventing eddy current heating. Frame filler 2.3 is a zirconium-containing aluminum silicate needled blanket; the zirconium-containing aluminum silicate needled blanket ensures the structural strength of the central sealing structure 2 while giving the central sealing structure 2 high-temperature resistance and anti-knock performance.

[0040] Example 2

[0041] A specific embodiment of the fire-facing sealing structure 1 is provided:

[0042] like Figure 4 As shown, the fire-facing sealing structure 1 is a multi-layer sealing plate structure, including a fire-facing fiber paper 1.1 covering the front surface of the central sealing structure 2, and fire-facing inorganic fireproof board 1.2, fire-facing composite board 1.3, and fire-facing metal explosion-proof panel 1.4 arranged parallel to the central sealing structure 2 and layered and fixed on the fire-facing fiber paper 1.1. The fire-facing fiber paper 1.1 can be 1mm thick ceramic fiber paper, the fire-facing inorganic fireproof board 1.2 can be 10mm thick inorganic fireproof board, the fire-facing composite board 1.3 can be 30mm thick composite board, and the fire-facing metal explosion-proof panel 1.4 can be 5mm thick metal explosion-proof panel.

[0043] Example 3

[0044] A specific embodiment of the back-facing sealing structure 3 is provided:

[0045] like Figure 4As shown, the unexposed surface sealing structure 3 is also a multi-layer sealing plate structure, including an unexposed surface fiber paper 3.1 covering the rear surface of the central sealing structure 2, and unexposed surface inorganic fireproof board 3.2, unexposed surface composite board 3.3, and unexposed surface metal explosion-proof panel 3.4 arranged parallel to the central sealing structure 2 and layered and fixed on the unexposed surface fiber paper 3.1. The unexposed surface fiber paper 3.1 can be 1mm thick ceramic fiber paper, the unexposed surface inorganic fireproof board 3.2 can be 10mm thick inorganic fireproof board, the unexposed surface composite board 3.3 can be 30mm thick composite board, and the unexposed surface metal explosion-proof panel 3.4 can be 1mm thick metal explosion-proof panel.

[0046] Example 4

[0047] A specific embodiment of the converter valve side sleeve hole 4 is provided:

[0048] The axial direction of the converter transformer valve side bushing hole 4 is angled to the height direction of the central sealing structure 2. This angle is determined by the angle of the equipment (converter transformer bushing). The opening position and angle of the converter transformer valve side bushing hole 4 meet the equipment sealing requirements. For example... Figure 1 As shown, the orifice of the converter valve side sleeve hole 4 on the surface of the fire-facing sealing structure 1 is lower than the orifice of the converter valve side sleeve hole 4 on the surface of the unfacing sealing structure 3.

[0049] This utility model addresses the fire and explosion resistance requirements of the converter transformer valve hall opening in ultra-high voltage direct current converter stations. It designs an integrated composite structure, achieving efficient space utilization, enhanced explosion and fire resistance, and simplified construction through innovative designs of a central sealing structure 2, a fire-facing sealing structure 1, a back-facing sealing structure 3, and a converter transformer valve side sleeve hole 4. The central sealing structure 2 is the core for support and explosion and fire resistance. It adopts a "support keel frame + layered filling material" design, combining structural strength and functional protection. The support keel frame 2.1 is composed of stainless steel square tubing, with a detachable structure of a standard frame 5, an upper opening frame 6, and a lower opening frame 7, fixedly connected along the height direction. The converter transformer valve side sleeve hole 4 is located on the upper opening frame 6 and the lower opening frame 7. This design can buffer the explosive impact in stages, preventing overall frame damage, and also facilitates modular installation on site. The perforation filler 2.2 uses aluminosilicate cotton and fireproof mortar alternately filling the circumference of the sleeve hole, providing heat insulation and explosion protection, while ensuring that the non-magnetic supporting frame 2.1 maintains a gap of 100-150mm with the sleeve to prevent eddy current heating. The frame filler 2.3 is filled with zirconium-containing aluminosilicate needle-punched blanket, which, while supporting the frame structure, improves the overall structure's fire resistance and impact stability through its high temperature resistance (above 1260℃) and anti-blast properties.

[0050] The fire-facing sealing structure 1 provides multi-layered protection against explosions and fires, forming a composite barrier of "fiber paper + three-layer sealing board" to directly withstand the impact of the explosion and the high temperature of the flames. Specifically, the fire-facing fiber paper 1.1 is 1mm thick ceramic fiber paper, covering the front of the central sealing structure 2, blocking smoke and sparks and initially slowing heat conduction. The fire-facing inorganic fireproof board 1.2 is 10mm thick, forming a fire-resistant layer through its low thermal conductivity, preventing the spread of fire. The fire-facing composite board 1.3 is 30mm thick, enhancing the overall structural integrity and dispersing the impact force of the explosion. The fire-facing metal explosion-proof panel 1.4 is 5mm thick metal plate, serving as the outermost layer to directly resist the overpressure of the explosion. Through the rigidity of the material, it absorbs energy, achieving an explosion pressure resistance of over 0.5MPa.

[0051] The unexposed surface sealing structure 3 provides dual protection against fire and heat, as well as structural stability. It employs a multi-layered design similar to the fire-facing surface, but the material thickness is adjusted according to stress characteristics, balancing performance and cost. The unexposed surface fiber paper 3.1 is 1mm thick ceramic fiber paper, covering the rear of the central sealing structure 2, blocking heat and smoke penetration. The unexposed surface inorganic fireproof board 3.2 is 10mm thick inorganic fireproof board, working in conjunction with the fire-facing surface to form a fire-resistant barrier, ensuring that the temperature rise rate of the unexposed surface during a fire remains below the safe threshold. The unexposed surface composite board 3.3 is 30mm thick composite board, enhancing the overall structural resistance to deformation and preventing collapse of the unexposed surface due to impact or high temperatures. The unexposed surface metal explosion-proof panel 3.4 is 1mm thick metal plate, thinner than the fire-facing surface, optimizing cost while meeting explosion-proof requirements; it is primarily used to resist secondary reflections of blast waves.

[0052] Under a peak overpressure of 700 kPa, the deformation of the fireproof and explosion-proof sealing and isolation structure designed in this invention was calculated using a finite element three-dimensional numerical simulation. The stress distribution and deformation results during the explosion show that the maximum instantaneous deformation of the fireproof and explosion-proof sealing and isolation structure is 11.895 mm, exhibiting repeated oscillations over a certain period without fracture or collapse. An explosion test was conducted on the fireproof and explosion-proof sealing and isolation structure designed in this invention. After withstanding a peak overpressure of 702.8743 kPa, the surface of the fireproof and explosion-proof sealing and isolation structure did not fracture or collapse. Therefore, the fireproof and explosion-proof sealing and isolation structure designed in this invention can provide effective protection.

[0053] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this utility model is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims. The shapes, dimensions, ratios, angles, and figures disclosed in the description of various aspects of this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it is determined that they would unnecessarily obscure the focus of this specification and claims. When using the terms "comprising," "having," and "including" as described in this specification, there may also be another part or other parts, and the terms used are generally singular but may also represent plural forms.

[0054] Finally, it should be noted that the above embodiments are merely representative examples of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A fireproof and explosion-proof sealing and isolation structure for the opening of a converter transformer valve hall, characterized in that: It includes a central sealing structure (2); a fire-facing sealing structure (1) and a back-facing sealing structure (3) that are fixed and cover the front and rear surfaces of the central sealing structure (2); and a converter valve side sleeve hole (4) is provided in the lower middle part of the integral structure composed of the central sealing structure (2), the fire-facing sealing structure (1) and the back-facing sealing structure (3). The central sealing structure (2) includes a supporting keel frame (2.1) and a central filling material filled within the supporting keel frame (2.1); Both the fire-facing sealing structure (1) and the unfacing sealing structure (3) include multiple layers of sealing plates arranged parallel to the central sealing structure (2).

2. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 1, characterized in that: The central filling material includes a peri-hole filling material (2.2) that fills the space between the converter valve side sleeve hole (4) and the supporting keel frame (2.1) along the circumferential direction of the converter valve side sleeve hole (4), and a keel frame filling material (2.3) that fills the supporting keel frame (2.1) and is located outside the area where the peri-hole filling material (2.2) is located.

3. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 2, characterized in that: The perforated filler (2.2) includes aluminum silicate cotton and fireproof sealant arranged alternately along the circumferential direction of the perforation wall; the aluminum silicate cotton and fireproof sealant can maintain a gap of 100-150mm between the supporting keel frame (2.1) made of non-magnetic material and the sleeve arranged in the bushing hole (4) of the converter valve side sleeve, to prevent eddy current heating.

4. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 2, characterized in that: The keel frame filler (2.3) includes zirconium-containing aluminum silicate needled blanket; while ensuring the structural strength of the central sealing structure (2), the zirconium-containing aluminum silicate needled blanket enables the central sealing structure (2) to have high temperature resistance and anti-knock performance.

5. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 1, characterized in that: The fire-facing sealing structure (1) includes a fire-facing fiber paper (1.1) covering the front surface of the central sealing structure (2) and a three-layer fire-facing sealing plate arranged parallel to the central sealing structure (2) and layer by layer covering and fixed on the fire-facing fiber paper (1.1).

6. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 5, characterized in that: The fire-facing three-layer sealing plate includes a fire-facing inorganic fireproof board (1.2), a fire-facing composite board (1.3), and a fire-facing metal explosion-proof panel (1.4), which are layered and fixed on the fire-facing fiber paper (1.1).

7. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 1, characterized in that: The back-fire sealing structure (3) includes a back-fire fiber paper (3.1) covering the rear surface of the middle sealing structure (2) and a three-layer back-fire sealing plate arranged parallel to the middle sealing structure (2) and layer by layer covering and fixed on the back-fire fiber paper (3.1).

8. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 7, characterized in that: The three-layer sealing plate on the unexposed side includes an inorganic fireproof board (3.2), a composite board (3.3), and a metal explosion-proof panel (3.4) that are layered and fixed on the fiber paper (3.1) on the unexposed side.

9. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 1, characterized in that: The supporting keel frame (2.1) includes one or more standard frames (5) fixedly connected as an integral structure along the height direction of the central sealing structure (2) and one or more sets of perforated frames. Each set of perforated frames has a converter valve side sleeve hole (4) in the middle. The disassembly-designed supporting keel frame (2.1) can buffer the explosion impact in stages to avoid the supporting keel frame (2.1) being completely destroyed.

10. The fireproof and explosion-proof sealing and isolation structure for the opening of the converter transformer valve hall as described in claim 9, characterized in that: Each set of the perforated skeletons includes at least two upper perforated skeletons (6) and lower perforated skeletons (7) arranged vertically.

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