UHV converter station valve side sealing system prefabricated fireproof and explosion-proof integrated structure

Abstract

This invention discloses a prefabricated, fireproof, and explosion-proof integrated structure for the valve-side sealing system of an ultra-high voltage converter station. It solves the technical problem of existing converter station valve-side sealing systems being difficult to disassemble and inefficient during installation and maintenance, leading to long installation and maintenance cycles and increased economic losses for the State Grid. The invention includes an upper fireproof and explosion-proof module and a lower fireproof and explosion-proof module. A fitting through-hole adapted to the converter transformer bushing is provided at the joint between the upper and lower fireproof and explosion-proof modules. The converter transformer bushing is fitted into the fitting through-hole and sealed tightly with flexible ceramicized silicone rubber material. This invention effectively improves the fireproof and explosion-proof performance of the converter station valve-side bushing sealing system, achieving integrated fireproof and explosion-proof sealing. It effectively improves the efficiency of installation and disassembly of the sealing system during converter transformer maintenance and reduces the difficulty of operation and maintenance, shortening the converter transformer maintenance or replacement cycle, thereby reducing economic losses to the State Grid due to power outages.

Description

Technical Field

[0001] This invention belongs to the field of converter station sealing technology, and relates to an integrated prefabricated fireproof and explosion-proof structure for valve-side sealing systems in ultra-high voltage converter stations. Background Technology

[0002] With the construction of the State Grid's new power system, a large proportion of new energy power generation, such as wind, solar, and hydropower, has been connected to the grid, posing a severe challenge to the safe and stable operation of the power system. As a crucial carrier of the new power system, ultra-high voltage (UHV) technology will accelerate its development. Currently, the State Grid has built as many as 26 UHV converter stations above ±800kV, and plans to build 14 more during the 14th Five-Year Plan period. Under the conditions of high voltage, high load, and complex grid structure, the safety risks of converter transformers are becoming increasingly prominent. Converter stations are prone to fires, especially UHV converter stations. Once a fire occurs, it will cause hundreds of millions of yuan in losses to the State Grid and serious negative social impacts. Improving the fireproof and explosion-proof performance of valve hall sealing in converter stations has become the most direct and effective means to ensure the safe operation of converter transformer equipment, prevent the spread of fire, and reduce economic losses.

[0003] Currently, UHV converter stations adopt a double-layer protection system of valve hall fireproofing reinforcement and explosion-proof doors for fire protection enhancement, but the following shortcomings still exist: (1) Separate assembly of fireproof sealing and explosion-proof doors will create a weak link between the explosion-proof door and the bushing. The energy of an explosion of the converter transformer will bypass this gap and cause a certain impact on the valve side sealing, reducing the fire defense capability of the sealing system and posing a hidden danger of fire spreading to the valve hall. (2) Separate assembly of sealing and explosion-proof doors does not meet the requirements of lean operation and maintenance. The installation and disassembly processes of the two systems of sealing and explosion-proof doors are complicated, and the maintenance or replacement cycle of the converter transformer is greatly extended. This will not only increase the difficulty of operation and maintenance, but also cause a lot of economic losses to the State Grid due to the long power outage period. (3) The filling materials used in the sealing system and explosion-proof doors are not environmentally friendly. Aluminum silicate is the main filler of sealing and explosion-proof doors. It has carcinogenic properties. At the same time, aluminum silicate needs to be fired at high temperature in preparation, which consumes a lot of carbon energy, which does not conform to the low-carbon trend.

[0004] Therefore, this invention designs an integrated fireproof and explosion-proof structure for the valve-side sealing system of ultra-high voltage converter stations, so that the valve-side sealing system of ultra-high voltage converter stations simultaneously possesses fire resistance, explosion-proof performance, and the characteristics of quick installation and maintenance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an integrated fireproof and explosion-proof structure for the valve side sealing system of ultra-high voltage converter stations, so as to at least solve some of the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The UHV converter station valve side sealing system is a prefabricated fireproof and explosion-proof integrated structure, including an upper fireproof and explosion-proof module that can be detachably installed on the converter station firewall, and a lower fireproof and explosion-proof module that can be detachably installed on the converter station firewall and is compatible with the upper fireproof and explosion-proof module; a fitting through hole adapted to the converter transformer bushing is opened at the splicing point of the upper and lower fireproof and explosion-proof modules, and the converter transformer bushing is sealed and fitted in the fitting through hole.

[0008] Furthermore, a small silicone rubber plug is provided between the converter transformer bushing and the through hole of the housing, and the converter transformer bushing and the through hole of the housing are sealed by the small silicone rubber plug.

[0009] Furthermore, the upper and lower fireproof and explosion-proof modules have the same structure, both including a first shielding plate, a first aerogel fireproof blanket, a first inorganic fireproof plate, a stainless steel keel, a second inorganic fireproof plate, a second aerogel fireproof blanket, a fiber explosion-proof plate, an explosion-reducing and energy-absorbing sandwich panel, and a second shielding plate, which are distributed sequentially from the inside to the outside. The stainless steel keel has a frame structure and is filled with aluminum silicate cotton between the keels.

[0010] Furthermore, the first shielding plate is a 0.6mm thick austenitic stainless steel plate, the first aerogel fireproof blanket is 5mm thick, the first inorganic fireproof board is 20mm thick, the stainless steel keel is made of austenitic stainless steel plate with a specification of 80mm*80mm*2mm, the second inorganic fireproof board is 20mm thick, the second aerogel fireproof blanket is 5mm thick, the fiber explosion-proof board is 9.5mm thick, the explosion-reducing and energy-absorbing sandwich panel is 50mm thick, and the second shielding plate is a 0.6mm thick austenitic stainless steel plate.

[0011] Furthermore, the explosion-proof energy-absorbing sandwich panel includes an energy-absorbing sandwich structure, and a first panel and a second panel respectively adhered to both sides of the energy-absorbing sandwich structure by an adhesive layer; the energy-absorbing sandwich structure, the first panel and the second panel are all made of austenitic stainless steel, and the energy-absorbing sandwich structure is a honeycomb sandwich panel or a dot matrix core panel.

[0012] Furthermore, both the upper and lower fireproof and explosion-proof modules are detachably and fixedly installed on the converter station firewall by bolts. Gaps are left between the converter station firewall and the upper and lower fireproof and explosion-proof modules, respectively. Austenitic stainless steel washers are provided on the bolts and are located within the gaps.

[0013] Furthermore, the upper fireproof and explosion-proof module is equipped with a lifting ring at the top, and a sealing plate is encapsulated between the upper and lower fireproof and explosion-proof modules. There are two sealing plates, which are respectively encapsulated on the front and back of the upper and lower fireproof and explosion-proof modules.

[0014] Furthermore, it also includes a pair of slide rails, with the upper and lower fireproof and explosion-proof modules located within the pair of slide rails, and the upper and lower fireproof and explosion-proof modules respectively slidingly contacting the slide rails.

[0015] Furthermore, both sides of the upper and lower fireproof and explosion-proof modules are equipped with pulleys that are compatible with the slide rails. The pulleys are slidably embedded in the slide rails, which are made of channel steel and have baffles at the open ends. The pulleys are equipped with pulley frames, and both the upper and lower fireproof and explosion-proof modules are equipped with connecting rods that are connected to the pulley frames.

[0016] Furthermore, the upper fireproof and explosion-proof module has a first arc-shaped slot, and the lower fireproof and explosion-proof module has a second arc-shaped slot. The first arc-shaped slot and the second arc-shaped slot are assembled into a through hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention has a simple structure, a scientific and reasonable design, and is easy to use. It can effectively improve the fire resistance and explosion resistance of the weak parts of the valve side bushing, realize the integration of fire prevention and explosion resistance of valve hall sealing in converter stations, and at the same time effectively improve the efficiency of installation, disassembly and maintenance of the sealing system, reduce the difficulty of operation and maintenance, and shorten the maintenance or replacement cycle of converter transformers, thereby reducing the economic losses caused by power outages to the State Grid.

[0019] The fireproof and explosion-proof structure of this invention is assembled from an upper fireproof and explosion-proof module and a lower fireproof and explosion-proof module. A fitting through-hole adapted to the converter transformer bushing is provided at the joint between the upper and lower fireproof and explosion-proof modules. The converter transformer bushing is sealed within this fitting through-hole, and a small silicone rubber plug is used to seal the connection between the converter transformer bushing and the fitting through-hole. The upper and lower fireproof and explosion-proof modules are detachably installed to the converter station firewall using bolts. Gaps are left between the upper and lower fireproof and explosion-proof modules and the converter station firewall, and austenitic stainless steel washers are inserted through the bolt sections at these gaps to ensure a stable connection between the upper and lower fireproof and explosion-proof modules and the converter station firewall. The fitting through-hole is formed by assembling a first arc-shaped slot and a second arc-shaped slot. When maintenance of the converter transformer is required, the bolts can be removed to disconnect the upper fireproof and explosion-proof module. This allows the converter transformer bushing to be unsealed from the bushing's through-hole, making it easy to remove the transformer for maintenance. After maintenance, the transformer is reset, and the upper fireproof and explosion-proof module is then hoisted and bolted onto the converter station's firewall. Installation and maintenance are both very convenient, effectively improving the efficiency of converter transformer sealing system installation, disassembly, and maintenance, reducing the difficulty of operation and maintenance, and shortening the converter transformer maintenance or replacement cycle, thereby reducing the economic losses to the State Grid due to power outages.

[0020] The upper and lower fireproof and explosion-proof modules of this invention have the same structure, both including, from the inside out, a first shielding plate, a first aerogel fireproof blanket, a first inorganic fireproof plate, a stainless steel keel, aluminum silicate cotton between the keels, a second inorganic fireproof plate, a second aerogel fireproof blanket, a fiber explosion-proof plate, an explosion-reducing and energy-absorbing sandwich panel, and a second shielding plate. The second shielding plate, located on the outermost layer, is a 0.6mm thick austenitic stainless steel plate, which not only allows for shaping, making the overall surface flat and aesthetically pleasing, but also effectively resists explosions and reduces explosion energy. The explosion-reducing and energy-absorbing sandwich panel consists of an energy-absorbing sandwich structure, a first panel, and a second panel, with a total thickness of 50mm. The energy-absorbing sandwich structure is honeycomb-shaped or dot matrix-shaped, and when subjected to an explosive impact, it can collapse to absorb the explosive impact energy, exhibiting good explosion-proof performance and serving as the main explosion-proof structure. After the explosive impact energy is absorbed by the explosion-reducing and energy-absorbing sandwich panel, the remaining explosive impact energy reaches the fiber explosion-proof plate and is effectively blocked, thus effectively preventing the explosive impact energy from damaging the subsequent fireproof structure and ensuring the fireproof performance of the fireproof and explosion-proof structure. The second aerogel fire blanket and the second inorganic fireproof board are located behind the explosion-proof structure, effectively preventing the spread of flames and high temperatures from penetrating the fireproof and explosion-proof structure. Therefore, in the event of a fire with explosive impact, they can also effectively protect the transformer inside the converter transformer, ensuring its safety in an explosive fire. The stainless steel keel is made of austenitic stainless steel plate with specifications of 80mm*80mm*2mm, and is filled with aluminum silicate cotton between the keels. The aluminum silicate cotton has excellent fire resistance, and the stainless steel keel is also effective in explosion resistance, which can effectively enhance the fireproof and explosion-proof performance of the fireproof and explosion-proof structure. The first inorganic fireproof board, the first aerogel fire blanket, and the first shielding plate are sequentially arranged on the back of the stainless steel keel, which can further enhance the fire resistance, as well as the back shaping and explosion resistance.

[0021] This invention features a lifting ring at the top of the upper fireproof and explosion-proof module, and a pair of slide rails on both sides of the upper and lower fireproof and explosion-proof modules. The upper and lower fireproof and explosion-proof modules slide in contact with the slide rails via pulleys. Gaps are maintained between the converter station firewall and the upper and lower fireproof and explosion-proof modules, respectively. Austenitic stainless steel washers are placed on the bolts within these gaps. When maintenance is required on the transformer within the converter station, the bolts securing the upper fireproof and explosion-proof module to the converter station firewall are removed. The lifting ring is then hooked onto the lifting equipment, and the module is lifted upwards. The guide effect of the slide rails effectively ensures that the upper fireproof and explosion-proof module moves within the same vertical plane as the lower fireproof and explosion-proof module. Furthermore, the gap between the upper fireproof and explosion-proof module and the converter station firewall effectively prevents rubbing during repositioning, ensuring the integrity of the firewall and the upper fireproof and explosion-proof module, thus guaranteeing its fireproof and explosion-proof performance. Once the upper fireproof and explosion-proof module reaches a certain height, the transformer and other equipment requiring maintenance can be removed. After maintenance, the transformer and other maintenance equipment are installed in place, and the hoisting equipment lowers the upper fireproof and explosion-proof module. Due to the guiding effect of the slide rail, the upper fireproof and explosion-proof module can precisely align with the lower fireproof and explosion-proof module. Bolts and austenitic stainless steel washers are then installed to complete the installation. During the process, small silicone rubber seals need to be removed and installed to ensure a seal between the converter transformer bushing and the bushing through-hole. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is an external view of the present invention.

[0024] Figure 3 This is a cross-sectional view of the present invention.

[0025] Figure 4 This is a view of the assembled upper and lower fireproof and explosion-proof modules of the present invention.

[0026] Figure 5 This is a schematic diagram of the fireproof and explosion-proof module of the present invention.

[0027] Figure 6 This is a schematic diagram of the fireproof and explosion-proof module of the present invention.

[0028] Figure 7 This is a cross-sectional view of the upper or lower fireproof and explosion-proof module of the present invention.

[0029] Figure 8 This is a cross-sectional view of the explosion-reducing energy-absorbing sandwich panel of the present invention (the energy-absorbing sandwich structure is a honeycomb sandwich panel).

[0030] Figure 9 This is a cross-sectional view of another explosion-reducing energy-absorbing sandwich panel of the present invention (the energy-absorbing sandwich structure is a dot matrix core panel).

[0031] Figure 10 This is a schematic diagram of the stainless steel keel and the aluminum silicate cotton between the keels in this invention.

[0032] Figure 11 This is a perspective view of the slide rail of the present invention (with pulleys).

[0033] Figure 12 This is a cross-sectional view of the slide rail of the present invention (with pulleys).

[0034] Figure 13 This is a cross-sectional view of the slide rail of the present invention (without pulleys).

[0035] Figure 14 This is a schematic diagram of the pulley of the present invention.

[0036] The names corresponding to the reference numerals in the attached figures are as follows:

[0037] 1-Converter station firewall, 2-Upper fireproof and explosion-proof module, 3-Lower fireproof and explosion-proof module, 4-Bolt, 5-Through hole assembly, 6-Silicone rubber small plug, 7-First shielding plate, 8-First aerogel fireproof blanket, 9-First inorganic fireproof board, 10-Stainless steel keel, 11-Alumina silicate cotton between keels, 12-Second inorganic fireproof board, 13-Second aerogel fireproof blanket, 14-Fiber explosion-proof board, 15-Explosion-reducing energy-absorbing sandwich panel, 16-Second shielding plate, 17-Gap, 18-Lifting ring, 19-Slide rail, 20-Pulley, 21-First arc-shaped slot, 22-Second arc-shaped slot, 23-Energy-absorbing sandwich structure, 24-Adhesive layer, 25-First panel, 26-Second panel, 27-Sealing plate, 28-Baffle, 29-Pulley frame, 30-Connecting rod, 31-Austenitic stainless steel pad. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] like Figure 1-14 As shown, the UHV converter station valve-side sealing system provided by this invention features a prefabricated fireproof and explosion-proof integrated structure. This structure is simple, scientifically designed, and easy to use. It effectively improves the fireproof and explosion-proof performance of weak points in the valve-side bushing, achieving integrated fireproof and explosion-proof sealing. Simultaneously, it significantly improves the efficiency of installation, disassembly, and maintenance of the sealing system, reduces the difficulty of operation and maintenance, and shortens the maintenance or replacement cycle of the converter transformer, thereby reducing the economic losses to the State Grid due to power outages. This invention includes an upper fireproof and explosion-proof module 2 that can be detachably installed on the converter station firewall 1, and a lower fireproof and explosion-proof module 3 that can be detachably installed on the converter station firewall 1 and is compatible with the upper fireproof and explosion-proof module 2. A fitting through-hole 5, compatible with the converter transformer bushing, is provided at the joint between the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3. The converter transformer bushing is sealed and fitted within the fitting through-hole 5. A small silicone rubber plug 6 is provided between the converter transformer bushing and the through hole 5 of the sleeve, and the small silicone rubber plug 6 seals the converter transformer bushing and the through hole 5 of the sleeve.

[0042] In this invention, both the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3 are detachably and fixedly installed on the converter station firewall 1 using bolts 4. A gap 17 is left between the converter station firewall 1 and the upper and lower fireproof and explosion-proof modules 2 and 3, respectively. An austenitic stainless steel pad 31 is provided on the bolt 4, located within the gap 17. The upper fireproof and explosion-proof module 2 has a first arc-shaped slot 21, and the lower fireproof and explosion-proof module 3 has a second arc-shaped slot 22. The first and second arc-shaped slots 21 are assembled to form a through hole 5. Fireproof mortar is used to fill the joint between the upper and lower fireproof and explosion-proof modules 2 and 3.

[0043] The fireproof and explosion-proof structure of this invention is assembled from an upper fireproof and explosion-proof module and a lower fireproof and explosion-proof module. A fitting through-hole adapted to the converter transformer bushing is provided at the joint between the upper and lower fireproof and explosion-proof modules. The converter transformer bushing is sealed within this fitting through-hole, and a small silicone rubber plug is used to seal the connection between the converter transformer bushing and the fitting through-hole. The upper and lower fireproof and explosion-proof modules are detachably installed to the converter station firewall using bolts. Gaps are left between the upper and lower fireproof and explosion-proof modules and the converter station firewall, and austenitic stainless steel washers are inserted through the bolt sections at these gaps to ensure a stable connection between the upper and lower fireproof and explosion-proof modules and the converter station firewall. The fitting through-hole is formed by assembling a first arc-shaped slot and a second arc-shaped slot. When maintenance of the converter transformer is required, the bolts are removed, and the upper fireproof and explosion-proof module can be moved. This allows the converter transformer bushing to be unsealed from the bushing's through-hole, making it easy to remove the transformer for maintenance. After maintenance, the transformer is reset, and the upper fireproof and explosion-proof module is hoisted and bolted onto the converter station's firewall. Installation and maintenance are very convenient, effectively improving the efficiency of converter transformer sealing system installation, disassembly, and maintenance, reducing the difficulty of operation and maintenance, and shortening the converter transformer maintenance or replacement cycle, thereby reducing the economic losses to the State Grid due to power outages. This invention refers to UHV converter stations above ±800kV.

[0044] The upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3 of this invention have the same structure. They both include a first shielding plate 7, a first aerogel fireproof blanket 8, a first inorganic fireproof plate 9, a stainless steel keel 10, a second inorganic fireproof plate 12, a second aerogel fireproof blanket 13, a fiber explosion-proof plate 14, an explosion-reducing and energy-absorbing sandwich panel 15, and a second shielding plate 16, which are distributed from the inside to the outside. The stainless steel keel 10 has a frame structure and is filled with aluminum silicate cotton 11 between the keels. The first shielding plate 7 is made of 0.6mm thick austenitic stainless steel plate, the first aerogel fireproof blanket 8 is 5mm thick, the first inorganic fireproof plate 9 is 20mm thick, the stainless steel keel 10 is made of austenitic stainless steel plate with a size of 80mm*80mm*2mm, the second inorganic fireproof plate 12 is 20mm thick, the second aerogel fireproof blanket 13 is 5mm thick, the fiber explosion-proof plate 14 is 9.5mm thick, the explosion-reducing and energy-absorbing sandwich panel 15 is 50mm thick, and the second shielding plate 16 is made of 0.6mm thick austenitic stainless steel plate.

[0045] The explosion-proof and energy-absorbing sandwich panel 15 of the present invention includes an energy-absorbing sandwich structure 23, and a first panel 25 and a second panel 26 respectively adhered to both sides of the energy-absorbing sandwich structure 23 by an adhesive layer 24; the energy-absorbing sandwich structure 23, the first panel 25 and the second panel 26 are all made of austenitic stainless steel, and the energy-absorbing sandwich structure 23 is a honeycomb sandwich panel or a dot matrix core panel.

[0046] The upper and lower fireproof and explosion-proof modules of this invention have the same structure, both including, from the inside out, a first shielding plate, a first aerogel fireproof blanket, a first inorganic fireproof plate, a stainless steel keel, aluminum silicate cotton between the keels, a second inorganic fireproof plate, a second aerogel fireproof blanket, a fiber explosion-proof plate, an explosion-reducing and energy-absorbing sandwich panel, and a second shielding plate. The second shielding plate, located on the outermost layer, is a 0.6mm thick austenitic stainless steel plate, which not only allows for shaping, making the overall surface flat and aesthetically pleasing, but also effectively resists explosions and reduces explosion energy. The explosion-reducing and energy-absorbing sandwich panel consists of an energy-absorbing sandwich structure, a first panel, and a second panel, with a total thickness of 50mm. The energy-absorbing sandwich structure is honeycomb-shaped or dot matrix-shaped, and when subjected to an explosive impact, it can collapse to absorb the explosive impact energy, exhibiting good explosion-proof performance and serving as the main explosion-proof structure. After the explosive impact energy is absorbed by the explosion-reducing and energy-absorbing sandwich panel, the remaining explosive impact energy reaches the fiber explosion-proof plate and is effectively blocked, thus effectively preventing the explosive impact energy from damaging the subsequent fireproof structure and ensuring the fireproof performance of the fireproof and explosion-proof structure. The second aerogel fire blanket and the second inorganic fireproof board are located behind the explosion-proof structure, effectively preventing the spread of flames and high temperatures from penetrating the fireproof and explosion-proof structure. Therefore, in the event of a fire with explosive impact, they can also effectively protect the transformer inside the converter transformer, ensuring its safety in an explosive fire. The stainless steel keel is made of austenitic stainless steel plate with specifications of 80mm*80mm*2mm, and is filled with aluminum silicate cotton between the keels. The aluminum silicate cotton has excellent fire resistance, and the stainless steel keel is also effective in explosion resistance, which can effectively enhance the fireproof and explosion-proof performance of the fireproof and explosion-proof structure. The first inorganic fireproof board, the first aerogel fire blanket, and the first shielding plate are sequentially arranged on the back of the stainless steel keel, which can further enhance the fire resistance, as well as the back shaping and explosion resistance.

[0047] The first shielding plate 7, the first aerogel fireproof blanket 8, the first inorganic fireproof plate 9, the stainless steel keel 10, the aluminum silicate cotton between the keels 11, the second inorganic fireproof plate 12, the second aerogel fireproof blanket 13, the fiber explosion-proof plate 14, the explosion-reducing and energy-absorbing sandwich panel 15, and the second shielding plate 16 of the present invention can be fixed by screws or by adhesive layers.

[0048] In this invention, the firewall 1 of the converter station has gaps 17 between itself and the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3. Austenitic stainless steel washers 31 are provided on the bolts and are located within the gaps 17. The upper fireproof and explosion-proof module 2 has a lifting ring 18 at its top. A sealing plate 27 is encapsulated between the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3. Two sealing plates 27 are respectively encapsulated on the front and back sides of the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3. A pair of slide rails 19 are also included, with both the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3 located within these slide rails 19, and both modules slide in contact with the slide rails 19. Both sides of the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3 are equipped with pulleys 20 that are compatible with the slide rail 19. The pulleys 20 are slidably embedded in the slide rail 19, which is made of channel steel and has a baffle 28 at the open end. The pulleys 20 are equipped with pulley frames 29, and both the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3 are equipped with connecting rods 30 that are connected to the pulley frames 29. One end of the connecting rod 30 is connected to the pulley frame 29, and the other end is welded to the stainless steel keel 10. The slide rail 19 is fixed to the converter station firewall 1 with bolts. The sealing plate 27 is fixed to the upper fireproof and explosion-proof module 2 and the lower fireproof and explosion-proof module 3 with screws.

[0049] This invention features a lifting ring at the top of the upper fireproof and explosion-proof module, and a pair of slide rails on both sides of the upper and lower fireproof and explosion-proof modules. The upper and lower fireproof and explosion-proof modules slide in contact with the slide rails via pulleys. Gaps are left between the converter station firewall and the upper and lower fireproof and explosion-proof modules, respectively. Austenitic stainless steel washers are placed on the bolts, located within the gaps, and the bolts penetrate both the upper and lower fireproof and explosion-proof modules. When maintenance is required on the transformer within the converter station, the bolts securing the upper fireproof and explosion-proof module to the converter station firewall are removed. The lifting ring is then hooked onto the lifting equipment, and the module is lifted upwards. The guide effect of the slide rails effectively ensures that the upper fireproof and explosion-proof module moves within the same vertical plane as the lower fireproof and explosion-proof module. Simultaneously, the gap between the upper fireproof and explosion-proof module and the converter station firewall effectively prevents rubbing during repositioning, ensuring the integrity of the connection between the converter station firewall and the upper fireproof and explosion-proof module. Ensure its fireproof and explosion-proof performance. Once the upper fireproof and explosion-proof module reaches a certain height, the transformer and other equipment requiring maintenance can be removed. After maintenance, once the transformer and other maintenance equipment are in place, the hoisting equipment lowers the upper fireproof and explosion-proof module. Due to the guiding action of the slide rail, the upper fireproof and explosion-proof module can precisely align with the lower fireproof and explosion-proof module. Then, install the bolts and austenitic stainless steel pads to complete the installation. During the process, small silicone rubber seals need to be removed and installed to ensure a seal between the converter transformer bushing and the bushing through-hole.

[0050] This invention can effectively improve the fireproof and explosion-proof performance of the valve-side bushing sealing system of converter stations, realize the integration of fireproof and explosion-proof functions of the sealing system, effectively improve the efficiency of installation and disassembly of the sealing system during converter transformer maintenance, reduce the difficulty of operation and maintenance, shorten the maintenance or replacement cycle of converter transformers, and thus reduce the economic losses caused by power outages to the State Grid.

[0051] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields are similarly included within the patent protection scope of the present invention.

Claims

1. A prefabricated, fireproof, and explosion-proof integrated structure for the valve-side sealing system of an ultra-high voltage converter station, characterized in that: It includes an upper fireproof and explosion-proof module (2) that can be detachably installed on the firewall (1) of the converter station, and a lower fireproof and explosion-proof module (3) that can be detachably installed on the firewall (1) of the converter station and is compatible with the upper fireproof and explosion-proof module (2); a fitting through hole (5) that is compatible with the converter transformer bushing is provided at the splicing point of the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3), and the converter transformer bushing is sealed and fitted in the fitting through hole (5); The upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) have the same structure, both including the first shielding plate (7), the first aerogel fireproof blanket (8), the first inorganic fireproof board (9), the stainless steel keel (10), the second inorganic fireproof board (12), the second aerogel fireproof blanket (13), the fiber explosion-proof board (14), the explosion-reducing and energy-absorbing sandwich panel (15), and the second shielding plate (16) distributed from the inside to the outside. The explosion-proof energy-absorbing sandwich panel (15) includes an energy-absorbing sandwich structure (23), and a first panel (25) and a second panel (26) respectively adhered to both sides of the energy-absorbing sandwich structure (23) by an adhesive layer (24); the energy-absorbing sandwich structure (23) is a honeycomb sandwich panel or a dot matrix core panel; The upper fireproof and explosion-proof module (2) has a first arc-shaped slot (21) and the lower fireproof and explosion-proof module (3) has a second arc-shaped slot (22). The first arc-shaped slot (21) and the second arc-shaped slot (22) are assembled into a through hole (5).

2. The prefabricated fireproof and explosion-proof integrated structure of the valve-side sealing system for ultra-high voltage converter stations according to claim 1, characterized in that, A small silicone rubber plug (6) is provided between the converter bushing and the through hole (5) of the sleeve, and the converter bushing and the through hole (5) of the sleeve are sealed by the small silicone rubber plug (6).

3. The prefabricated fireproof and explosion-proof integrated structure of the UHV converter station valve side sealing system according to claim 1, characterized in that, The stainless steel keel (10) has a frame structure and is filled with aluminum silicate cotton (11) between the keels.

4. The prefabricated fireproof and explosion-proof integrated structure of the UHV converter station valve side sealing system according to claim 3, characterized in that, The first shielding plate (7) is a 0.6mm thick austenitic stainless steel plate, the first aerogel fireproof blanket (8) is 5mm thick, the first inorganic fireproof plate (9) is 20mm thick, the stainless steel keel (10) is made of austenitic stainless steel plate with a specification of 80mm*80mm*2mm, the second inorganic fireproof plate (12) is 20mm thick, the second aerogel fireproof blanket (13) is 5mm thick, the fiber explosion-proof plate (14) is 9.5mm thick, the explosion-reducing and energy-absorbing sandwich panel (15) is 50mm thick, and the second shielding plate (16) is a 0.6mm thick austenitic stainless steel plate.

5. The prefabricated fireproof and explosion-proof integrated structure of the UHV converter station valve side sealing system according to claim 3, characterized in that, The energy-absorbing sandwich structure (23), the first panel (25), and the second panel (26) are all made of austenitic stainless steel.

6. The prefabricated fireproof and explosion-proof integrated structure of the valve-side sealing system for ultra-high voltage converter stations according to claim 1, characterized in that, The upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) are detachably and fixedly installed on the converter station firewall (1) by bolts (4). There is a gap (17) between the converter station firewall (1) and the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) respectively. An austenitic stainless steel pad (31) is provided on the bolt (4), and the austenitic stainless steel pad (31) is located in the gap (17).

7. The prefabricated fireproof and explosion-proof integrated structure of the valve-side sealing system for ultra-high voltage converter stations according to claim 1, characterized in that, The upper fireproof and explosion-proof module (2) is equipped with a lifting ring (18) at the top. A sealing plate (27) is encapsulated between the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3). There are two sealing plates (27), which are respectively encapsulated on the front and back sides of the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3).

8. The prefabricated fireproof and explosion-proof integrated structure of the valve-side sealing system for ultra-high voltage converter stations according to claim 1, characterized in that, It also includes a pair of slide rails (19), with the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) located inside the pair of slide rails (19), and the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) respectively sliding contact with the slide rails (19).

9. The prefabricated fireproof and explosion-proof integrated structure of the valve-side sealing system for ultra-high voltage converter stations according to claim 8, characterized in that, Both sides of the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) are provided with pulleys (20) that are compatible with the slide rail (19). The pulleys (20) are slidably embedded in the slide rail (19). The slide rail (19) is made of channel steel, and a baffle (28) is provided at the open end of the channel steel. The pulleys (20) are provided with pulley frames (29). Both the upper fireproof and explosion-proof module (2) and the lower fireproof and explosion-proof module (3) are provided with connecting rods (30) that are connected to the pulley frames (29).

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