Dry-type transformer with insulation fireproof self-protection function

Abstract

The present application relates to the technical field of transformer, in particular to a dry-type transformer with insulation fireproof self-protection function, comprising a plurality of partition fireproof devices installed on the transformer coil, the partition fireproof device comprises an assembled storage frame installed above the coil, a guide spray pipe is installed above the assembled storage frame, the guide spray pipe is used for conveying fire extinguishing gas to the inside and above of the assembled storage frame, an automatic fire extinguisher is installed beside the guide spray pipe, the output end of the automatic fire extinguisher is connected with the input end of the guide spray pipe, the automatic fire extinguisher is used for conveying fire extinguishing gas to the guide spray pipe, a folding protective cover is further installed in the inside of the assembled storage frame, the sleeving end of the folding protective cover extends downward, the folding protective cover is used for isolating the transformer, the folding protective cover is sleeved on the outside of the transformer and can guide the fire extinguishing gas to flow along the outer wall of the transformer, the partition fireproof device further comprises a smoke sensor installed above the transformer, the present application improves the fire extinguishing efficiency and reduces the loss.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a dry-type transformer with insulation, fire prevention and self-protection functions. Background Technology

[0002] Dry-type transformers, as key equipment in power systems, are widely used in urban power distribution, high-rise buildings, and special locations such as flammable and explosive environments due to their advantages such as requiring no insulating oil, good environmental performance, and simple maintenance. However, during long-term operation, dry-type transformers may experience localized high temperatures or fires due to factors such as overload, short circuit, insulation aging, or external ignition sources. If not controlled in time, this can lead to serious equipment damage or even secondary disasters. Therefore, improving the insulation fire resistance and self-protection efficiency of dry-type transformers is crucial.

[0003] Chinese patent CN120015490A discloses an insulated and fireproof dry-type transformer and its usage method, including a base plate. A transformer body is fixedly mounted on the upper center of the base plate, and connecting cables are fixedly mounted on the outer side of the transformer body. An isolation mechanism for fire prevention is provided between the base plate and the transformer body, and a fire extinguishing mechanism for rapid fire suppression of the transformer body is provided at the lower end of the base plate. This device is effective, adding an isolation and protection mechanism to the dry-type transformer. During normal use, the dry-type transformer is exposed and can dissipate heat naturally, ensuring normal operation. In the event of any form of fire, whether external or internal, this device can quickly isolate the transformer.

[0004] While the aforementioned technical solutions can isolate the transformer body using an isolation mechanism, they suffer from the following drawbacks: Although the isolation mechanism can seal the transformer, a large cavity exists between it and the transformer body. Flames may continue to burn within this cavity until the extinguishing agent completely fills it. This process delays extinguishing time, allowing the fire to spread and exacerbating transformer damage. Transformer fires are typically caused by localized high temperatures. Existing isolation mechanisms require complete enclosure, making it impossible to quickly and directionally extinguish the fire at the ignition point, resulting in wasted resources and limited effectiveness. Delayed extinguishing expands the damaged area of ​​the transformer, increasing repair difficulty and economic losses. Summary of the Invention

[0005] To address the aforementioned issues, a dry-type transformer with insulation and fireproof self-protection functions is provided. The fire-fighting efficiency is improved by using a fire-prevention partition, while avoiding economic losses.

[0006] To address the problems of existing technologies, this invention provides a dry-type transformer with insulation and fireproof self-protection functions, including multiple fire-resistant isolation devices installed on the transformer coils. Each fire-resistant isolation device includes an assembled storage frame installed above the coils, with a guide nozzle installed above the frame. The guide nozzle delivers extinguishing gas into and above the assembled storage frame. An automatic fire extinguisher is installed beside the guide nozzle, with its output end connected to the input end of the guide nozzle. The automatic fire extinguisher delivers extinguishing gas to the guide nozzle. A folding protective cover is also installed inside the assembled storage frame, with its fitted end extending downwards. The folding protective cover serves to fireproof and isolate the transformer. When fitted onto the outside of the transformer, the folding protective cover guides the extinguishing gas to flow along the outer wall of the transformer. The fire-resistant isolation device also includes a smoke sensor installed above the transformer, which is connected to the automatic fire extinguisher system.

[0007] Preferably, the assembled storage frame consists of two rotating mounting rails, with one end of each rail rotatably connected to the other. A movable locking rod is located at the end of each rail furthest from the adjacent rail, used to engage and secure the two rails. Each rotating mounting rail has a limiting storage slot for storing a folding protective cover. Multiple pressure-bearing supports are installed on the inner side of each rail, engaging and securing them to a transformer. Multiple limiting locking mechanisms are also located on the side of each rotating mounting rail, engaging the folding protective cover and connecting to a guide nozzle.

[0008] Preferably, the pressure support includes an L-shaped clamping plate installed inside the rotating mounting rail. The top of the L-shaped clamping plate is provided with a docking hole. A pressure member is provided above the L-shaped clamping plate. The pressure member includes a docking shaft. An elastic pressure shaft is slidably installed on the docking shaft. A first spring is installed between the elastic pressure shaft and the docking shaft.

[0009] Preferably, the limiting and locking mechanism includes multiple fixed mounting brackets installed on the side of the rotating mounting rail. Each fixed mounting bracket has an L-shaped hook slidably mounted on it. A second spring is installed between the L-shaped hook and the fixed mounting bracket. Each L-shaped hook has a pushing post on both sides. The pushing post is slidably connected to the fixed mounting bracket. A third spring is installed between the pushing post and the fixed mounting bracket. The limiting and locking mechanism also includes a pneumatic pushing mechanism for driving the L-shaped hook to move. The pneumatic pushing mechanism is connected to the guide nozzle.

[0010] Preferably, the pneumatic pushing mechanism includes a connecting bracket installed below the guide nozzle, a sealing block on the top of the connecting bracket, the sealing block extending inward through the guide nozzle, the sealing block being slidably connected to the guide nozzle, an airflow ramp on the side of the sealing block, and multiple ramp blocks installed below the connecting bracket, the ramp blocks being positioned between the fixed mounting bracket and the L-shaped hook, and a pushing ramp on the side of the ramp blocks.

[0011] Preferably, the folding protective cover includes a fireproof cloth installed inside the limiting storage slot. The fireproof cloth has several folds on its outer side. The top of the fireproof cloth is fixedly connected to the inner wall of the limiting storage slot. The fireproof cloth also has multiple threading holes. Two assembly bases are installed at the bottom of the fireproof cloth. A fixing connector is installed between the two assembly bases. The assembly bases are equipped with counterweights and buffer layers. The folding protective cover also includes a traction device to assist in storing the fireproof cloth.

[0012] Preferably, the traction device includes two rotating take-up shafts rotatably mounted on a rotating mounting rail. Each rotating take-up shaft is equipped with a traction rope. The end of the traction rope away from the rotating take-up shaft passes through the wire hole of the fireproof cloth and is connected to the assembly base. The traction device also includes a synchronous transmission mechanism installed on the side of the assembly storage frame. The synchronous transmission mechanism is detachably connected to the assembly storage frame. The synchronous transmission mechanism has a gear transmission assembly inside. The drive end of the gear transmission assembly has a drive handle. The output end of the gear transmission assembly has two transmission shafts. The transmission shafts are connected to the rotating take-up shafts.

[0013] Preferably, the guide nozzle is provided with two multi-angle nozzles, which are distributed on the rotating mounting rail. The multi-angle nozzles are provided with an upper nozzle above them and multiple lower nozzles below them. The lower nozzles are connected to the interior of the rotating mounting rail. The multi-angle nozzles are also provided with an insertion channel below them, which is connected to the interior of the multi-angle nozzles. The insertion channel is used for sliding installation of the sealing block.

[0014] The advantages of this invention compared to the prior art are: 1. This invention achieves precise isolation and protection of transformer coils through the installation of multiple fire-prevention isolation devices. When a transformer catches fire due to localized high temperatures, the smoke sensor detects the smoke, and the automatic fire extinguisher quickly activates, delivering extinguishing gas through a guide nozzle. The increased pressure inside the guide nozzle pushes the fixed end of the assembled storage frame, releasing the restriction on the folding protective cover, allowing it to accurately fit onto the outside of the transformer coils, effectively separating each coil. This design effectively prevents the spread of fire between coils, reducing the degree of equipment damage. Simultaneously, the small flow gaps between the folding protective covers allow the extinguishing gas to flow quickly and fill the entire internal space of the protective cover. Compared to the traditional method of filling large cavities with extinguishing gas, this significantly improves the filling speed and extinguishing efficiency, enabling timely control of the fire and preventing further expansion.

[0015] 2. The guiding nozzle not only sprays the extinguishing gas into the unfolded folding protective cover, but also directs a portion of the extinguishing gas towards the transformer's wiring connection area. This design ensures that all critical parts of the transformer are covered by the extinguishing gas, achieving comprehensive fire suppression. Traditional isolation mechanisms require complete enclosure and cannot quickly and directionally extinguish fires at the ignition point, resulting in wasted resources and limited effectiveness. This device, through precise delivery of extinguishing gas and comprehensive coverage, can more effectively extinguish fires. Delayed fire suppression expands the damage area of ​​the transformer, increasing repair difficulty and economic losses. This device's rapid and comprehensive fire suppression method effectively reduces these adverse effects caused by delayed fire suppression, lowers the difficulty of transformer repair, reduces economic losses, and improves the operational safety and economy of the transformer. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a dry-type transformer with insulation, fire prevention, and self-protection functions according to the present invention. Figure 1 .

[0017] Figure 2 This is a three-dimensional schematic diagram of a dry-type transformer with insulation, fire prevention, and self-protection functions according to the present invention. Figure 2 .

[0018] Figure 3 This is a three-dimensional schematic diagram of a fire-prevention partition device in a dry-type transformer with insulation, fire prevention, and self-protection functions according to the present invention. Figure 1 .

[0019] Figure 4 This is a three-dimensional schematic diagram of a fire-prevention partition device in a dry-type transformer with insulation, fire prevention, and self-protection functions according to the present invention. Figure 2 .

[0020] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0021] Figure 6 yes Figure 4 A magnified view of a section at point B in the middle.

[0022] Figure 7 This is a side view of a fire-prevention device for a dry-type transformer with insulation and fire-prevention self-protection functions according to the present invention.

[0023] Figure 8 yes Figure 7 Planar sectional view at section CC.

[0024] Figure 9 This is a three-dimensional schematic diagram of a fire-prevention partition device in a dry-type transformer with insulation, fire prevention, and self-protection functions according to the present invention. Figure 3 .

[0025] Figure 10 This is an exploded view of the multi-angle nozzle and pneumatic pushing mechanism in a dry-type transformer with insulation, fire prevention and self-protection functions according to the present invention.

[0026] Figure 11 This is a schematic diagram of the unfolded state of the folded protective cover in a dry-type transformer with insulation, fireproof and self-protection functions according to the present invention.

[0027] The numbers on the map are: 1. Transformer; 2. Assembled storage frame; 21. Rotating mounting rail; 211. Limiting storage slot; 22. Movable locking rod; 23. Pressure support component; 231. L-shaped locking plate; 232. Connecting shaft; 233. Elastic pressure shaft; 234. First spring; 24. Limiting locking mechanism; 241. Fixed mounting bracket; 242. L-shaped hook; 243. Second spring; 244. Pushing column; 245. Third spring; 246. Pneumatic pushing mechanism; 2461. Inclined insert block; 2462. Pushing inclined plane; 2463. Connecting bracket; 2464. Sealing plug; 2465. Airflow ramp; 3. Folding protective cover; 31. Fireproof cloth; 32. Assembled base; 321. Fixed connector; 322. Counterweight; 323. Buffer layer; 33. Traction device; 331. Rotating winding shaft; 332. Traction rope; 333. Synchronous transmission mechanism; 3331. Drive shaft; 3332. Drive handle; 4. Guide nozzle; 41. Multi-angle nozzle; 42. Upper nozzle; 43. Lower nozzle; 44. Insertion channel. Detailed Implementation

[0028] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0029] See Figures 1 to 11 As shown, a dry-type transformer with insulation and fire protection self-protection function includes multiple fire-resistant isolation devices installed on the coils of transformer 1. The fire-resistant isolation devices include an assembly and storage frame 2 installed above the coils, a guide nozzle 4 installed above the assembly and storage frame 2, the guide nozzle 4 being used to deliver fire extinguishing gas into and above the assembly and storage frame 2, an automatic fire extinguisher installed beside the guide nozzle 4, the output end of the automatic fire extinguisher being connected to the input end of the guide nozzle 4, the automatic fire extinguisher being used to deliver fire extinguishing gas into the guide nozzle 4, a folding protective cover 3 also being installed inside the assembly and storage frame 2, the fitting end of the folding protective cover 3 extending downwards, the folding protective cover 3 being used to fire-isolate transformer 1, the folding protective cover 3 fitting outside the transformer 1 and being able to guide the fire extinguishing gas to flow along the outer wall of transformer 1, the fire-resistant isolation devices also include a smoke sensor installed above the transformer 1, the smoke sensor being connected to the automatic fire extinguisher system.

[0030] Before using transformer 1, multiple fire-prevention partitions are installed at corresponding positions on the transformer 1 coils. The assembled storage frame 2 is fixedly installed above the transformer 1 coils, providing support. During normal use, the folding protective cover 3 is stored inside the assembled storage frame 2, which limits and secures it, ensuring stability and preventing interference with the normal operation of transformer 1. Simultaneously, a smoke sensor is installed at a suitable position above transformer 1 to monitor for fire in the transformer 1 area in real time.

[0031] When transformer 1 catches fire due to factors such as localized high temperature, the smoke produced by the combustion rises and spreads to the area where the smoke sensor is located. The smoke sensor detects the smoke and determines that a fire has occurred in the area of ​​transformer 1, and then sends an activation signal to the automatic fire extinguisher connected to the system.

[0032] Upon receiving the activation signal from the smoke sensor, the automatic fire extinguisher immediately begins operation. The extinguishing gas stored inside is then delivered under pressure to the guide nozzle 4. The guide nozzle 4 serves as the delivery channel for the extinguishing gas, and its internal pressure gradually increases as it receives the gas.

[0033] When the internal pressure of the guide nozzle 4 rises to a certain level, this pressure will push the fixed end of the assembly and storage frame 2. This releases the fixed end of the assembly and storage frame 2 from its limiting fixation on the folding protective cover 3, allowing the folding protective cover 3 to fall under its own weight and accurately fit onto the outside of the transformer 1 coil, achieving effective isolation and protection for each coil, preventing the fire from spreading between the coils, and reducing the degree of equipment damage.

[0034] The guide nozzle 4 sprays the extinguishing gas into the unfolded folded protective cover 3. Due to the small flow gaps between the folded protective covers 3, the extinguishing gas can quickly flow through these gaps and fill the entire interior space of the protective cover. Compared to the traditional method of filling large cavities with extinguishing gas, this significantly increases the filling speed of the extinguishing gas, thereby effectively improving fire extinguishing efficiency. Simultaneously, the guide nozzle 4 also sprays some of the extinguishing gas towards the wiring connection area of ​​the transformer 1, ensuring that all critical parts of the transformer 1 are covered by the extinguishing gas, achieving comprehensive fire extinguishing, further controlling the fire, and reducing problems such as the expansion of damage to the transformer 1, increased repair difficulty, and greater economic losses caused by delayed fire extinguishing.

[0035] Smoke sensors and automatic fire extinguishers are both existing technologies and will not be discussed further here.

[0036] See Figures 1 to 9As shown, the assembled storage frame 2 consists of two rotating mounting rails 21. One end of the two rotating mounting rails 21 is rotatably connected to each other. The ends of the two rotating mounting rails 21 away from each other are provided with movable locking rods 22, which are used to lock and fix the two rotating mounting rails 21. The rotating mounting rails 21 are provided with limiting storage slots 211, which are used to store folding protective covers 3. Multiple pressure support members 23 are installed on the inner side of the rotating mounting rails 21. The pressure support members 23 are locked and fixed to the transformer 1. Multiple limiting locking mechanisms 24 are also provided on the side of the rotating mounting rails 21. The limiting locking mechanisms 24 are used to lock the folding protective covers 3. The limiting locking mechanisms 24 are connected to the guide nozzle 4 in a transmission connection.

[0037] When assembling and installing the storage frame 2, the operator first opens the ends of the two rotating mounting rails 21 that are rotatably connected to each other, so that the two rotating mounting rails 21 are in an open state, allowing them to be quickly fitted onto the outside of the transformer 1 coil. After the rotating mounting rails 21 are accurately fitted into the predetermined positions, the movable locking rods 22 are used to lock and fix the ends of the two rotating mounting rails 21 away from each other. This ensures that the two rotating mounting rails 21 remain in a stable fitted state and will not loosen or fall off during operation.

[0038] Meanwhile, the pressure support 23 provided on the inner side of the rotating mounting rail 21 plays a fixing role. When the pressure support 23 comes into contact with the transformer 1, it generates a mutual pressure force. Through the action of this force, the two rotating mounting rails 21 can be stably installed on the outside of the transformer 1 coil, providing a reliable support foundation for the entire fireproof enclosure.

[0039] The rotating mounting rail 21 is equipped with a limiting storage slot 211, the shape and size of which are adapted to the folding protective cover 3 for storing the folding protective cover 3. During normal operation of the transformer 1, the folding protective cover 3 is stored within the limiting storage slot 211. At this time, multiple limiting locking mechanisms 24 provided on the side of the rotating mounting rail 21 function to limit and lock the folding protective cover 3. This ensures that the folding protective cover 3 remains stable and will not accidentally fall off or unfold due to vibration of the transformer 1 or other external factors, thereby avoiding interference with the normal operation of the transformer 1.

[0040] When transformer 1 catches fire due to localized high temperatures or other factors, the automatic fire extinguisher activates and delivers extinguishing gas to the guide nozzle 4. The guide nozzle 4, acting as a delivery channel for the extinguishing gas, experiences a gradual increase in internal pressure as it receives the gas. Since the limiting locking mechanism 24 is connected to the guide nozzle 4, when the internal pressure of the guide nozzle 4 rises to a certain level, a corresponding transmission force is generated. This force is transmitted to the limiting locking mechanism 24, triggering its unlocking action.

[0041] After the limiting locking mechanism 24 is unlocked, the limiting locking effect on the folding protective cover 3 disappears, and the folding protective cover 3 falls from the limiting storage slot 211 under its own gravity. Since the two rotating mounting rails 21 have been pre-accurately fitted onto the outside of the transformer 1 coil, the folding protective cover 3 can be accurately fitted onto the outside of the transformer 1 coil, achieving effective isolation and protection for each coil, preventing the spread of fire between coils, and reducing the degree of equipment damage.

[0042] See Figures 3 to 5 As shown, the pressure support 23 includes an L-shaped clamping plate 231 installed inside the rotating mounting rail 21. The top of the L-shaped clamping plate 231 is provided with a docking hole. A pressure member is provided above the L-shaped clamping plate 231. The pressure member includes a docking shaft 232. An elastic pressure shaft 233 is slidably installed on the docking shaft 232. A first spring 234 is installed between the elastic pressure shaft 233 and the docking shaft 232.

[0043] During the process of fitting the rotating mounting rail 21 onto the outside of the transformer 1 coil, the L-shaped clamping plate 231 serves to support the rotating mounting rail 21, allowing it to remain at a predetermined position on the outside of the transformer 1 coil. The mating shaft 232 of the pressure member is detachably connected to the mating hole. During the initial installation stage of the rotating mounting rail 21, for ease of operation, the operator separates the pressure member from the L-shaped clamping plate 231. After the rotating mounting rail 21 is accurately fitted onto the outside of the transformer 1 coil, the operator begins the mating operation of the pressure member.

[0044] First, the operator compresses the elastic pressing shaft 233 and the docking shaft 232. During this process, the first spring 234, installed between the elastic pressing shaft 233 and the docking shaft 232, deforms under the pressure, storing elastic potential energy. Then, the docking shaft 232 is accurately inserted into the docking hole at the top of the L-shaped clamping plate 231, completing the initial connection between the pressing component and the L-shaped clamping plate 231. Afterward, the operator releases the compressive force on the elastic pressing shaft 233 and the docking shaft 232, releasing the stored elastic potential energy of the first spring 234, generating an upward elastic force that pushes the elastic pressing shaft 233 upward. Once the elastic pressing shaft 233 moves upward and contacts the top surface of the transformer 1, the continuous elastic force of the first spring 234 provides elastic pressure to the top of the transformer 1. This elastic pressure creates a tight pressing contact between the rotating mounting rail 21 and the transformer 1, effectively enhancing the stability of the rotating mounting rail 21 installation. Simultaneously, the detachable docking method improves the ease of disassembly and installation of the rotating mounting rail 21.

[0045] See Figures 3 to 6As shown, the limiting latching mechanism 24 includes multiple fixed mounting brackets 241 installed on the side of the rotating mounting rail 21. Each fixed mounting bracket 241 has an L-shaped hook 242 slidably mounted on it. A second spring 243 is installed between the L-shaped hook 242 and the fixed mounting bracket 241. Each L-shaped hook 242 has a pushing column 244 on both sides. The pushing column 244 is slidably connected to the fixed mounting bracket 241. A third spring 245 is installed between the pushing column 244 and the fixed mounting bracket 241. The limiting latching mechanism 24 also includes a pneumatic pushing mechanism 246 that drives the L-shaped hook 242 to move. The pneumatic pushing mechanism 246 is connected to the guide nozzle 4.

[0046] In normal operating condition, the folding protective cover 3 is stored in the limiting storage slot 211 of the rotating mounting rail 21. At this time, the L-shaped hook 242 installed on the fixed mounting bracket 241 maintains a stable engagement state under the action of the second spring 243. The hook of the L-shaped hook 242 effectively engages with the bottom of the folding protective cover 3, preventing the folding protective cover 3 from falling due to its own weight or vibration of the transformer 1. The elastic force provided by the second spring 243 ensures that the L-shaped hook 242 fits tightly against the folding protective cover 3, preventing the L-shaped hook 242 from disengaging from the folding protective cover 3 due to vibration, thereby ensuring the stability of the engagement.

[0047] Simultaneously, during the folding and storage of the protective cover 3, its bottom pushes the pushing posts 244 on both sides of the L-shaped hook 242 upward. As the pushing posts 244 move upward, they compress the third spring 245, thus storing elastic potential energy. Under normal conditions, the third spring 245 releases this elastic potential energy, ensuring that the pushing posts 244 maintain a downward pushing force.

[0048] When transformer 1 catches fire due to factors such as localized high temperature, the automatic fire extinguisher activates and delivers extinguishing gas to the guide nozzle 4. The guide nozzle 4 serves as a delivery channel for the extinguishing gas, and its internal pressure gradually increases during the process of receiving the extinguishing gas.

[0049] Since the pneumatic pushing mechanism 246 of the limiting locking mechanism 24 is connected to the guide nozzle 4, when the internal pressure of the guide nozzle 4 rises to a certain level, a corresponding transmission force is generated, which is transmitted to the pneumatic pushing mechanism 246. After receiving the transmission force, the pneumatic pushing mechanism 246 pushes the L-shaped hook 242 to move, causing the L-shaped hook 242 to disengage from the bottom of the folding protective cover 3, thereby unlocking the limiting locking mechanism 24.

[0050] After the limiting latching mechanism 24 is unlocked, the folding protective cover 3 loses its latching constraint. At this time, the elastic potential energy stored in the third spring 245 is released, pushing the push column 244 to move downwards rapidly. During the downward movement of the push column 244, it applies a downward force to the folding protective cover 3, causing the folding protective cover 3 to fall rapidly from the limiting storage slot 211 and unfold under the combined action of its own weight and the pushing force of the push column 244. Since the two rotating mounting rails 21 have been pre-accurately fitted onto the outside of the transformer 1 coil, the unfolded folding protective cover 3 can be accurately fitted onto the outside of the transformer 1 coil, achieving effective isolation and protection of each coil, preventing the spread of fire between coils, and reducing the degree of equipment damage.

[0051] See Figures 3 to 10 As shown, the pneumatic pushing mechanism 246 includes a connecting bracket 2463 installed below the guide nozzle 4. The top of the connecting bracket 2463 is provided with a blocking block 2464, which extends inward through the guide nozzle 4 and is slidably connected to the guide nozzle 4. The side of the blocking block 2464 is provided with an airflow ramp 2465. Multiple ramp blocks 2461 are installed below the connecting bracket 2463. The ramp blocks 2461 are arranged between the fixed mounting bracket 241 and the L-shaped hook 242. The side of the ramp blocks 2461 is provided with a pushing ramp 2462.

[0052] When transformer 1 is operating normally, the pressure inside the guide nozzle 4 is within the normal range. The sealing block 2464 of the pneumatic pushing mechanism 246 maintains a relatively stable position inside the guide nozzle 4, and the airflow ramp 2465 on its side is not subjected to significant air pressure force. At this time, the connecting bracket 2463 and the multiple ramp blocks 2461 installed below the connecting bracket 2463 are in their initial positions. There is no interaction force between the pushing ramp 2462 of the ramp block 2461 and the L-shaped hook 242. The L-shaped hook 242 maintains a stable latching state under the action of the second spring 243, firmly latching the folding protective cover 3 into the limiting storage groove 211 of the rotating mounting rail 21.

[0053] When transformer 1 catches fire due to localized high temperatures or other factors, the automatic fire extinguisher activates and delivers extinguishing gas to the guide nozzle 4. The guide nozzle 4 serves as the delivery channel for the extinguishing gas; as the extinguishing gas is continuously input, its internal pressure gradually increases. The high-pressure extinguishing gas acts on the airflow ramp 2465 on the side of the sealing block 2464. Because the airflow ramp 2465 is at an angle to the direction of extinguishing gas flow, the high-pressure extinguishing gas exerts a downward pushing force on the airflow ramp 2465. This pushing force pushes the sealing block 2464 downward within the guide nozzle 4. After the sealing block 2464 moves downward, the extinguishing gas within the guide nozzle 4 can flow freely without being obstructed by the sealing block 2464. Simultaneously, the downward movement of the sealing block 2464 also drives the connected bracket 2463 to move downward synchronously. Multiple inclined blocks 2461 installed below the connecting bracket 2463 move downwards along with the connecting bracket 2463. The pushing inclined surface 2462 on the side of the inclined block 2461 contacts the L-shaped hook 242. During the downward movement of the inclined block 2461, relative movement occurs between the pushing inclined surface 2462 and the L-shaped hook 242. The pushing inclined surface 2462 applies a horizontal pushing force to the L-shaped hook 242, pushing the L-shaped hook 242 to slide on the fixed mounting bracket 241. Under the action of the pushing force, the L-shaped hook 242 moves and gradually disengages from the locking state with the bottom of the folding protective cover 3, realizing the unlocking action of the limit locking mechanism 24.

[0054] See Figures 3 to 11 As shown, the folding protective cover 3 includes a fireproof cloth 31 installed inside the limiting storage groove 211. The fireproof cloth 31 has several folds on its outer side. The top of the fireproof cloth 31 is fixedly connected to the inner wall of the limiting storage groove 211. The fireproof cloth 31 also has multiple wire holes. Two assembly bases 32 are installed at the bottom of the fireproof cloth 31. A fixing connector 321 is installed between the two assembly bases 32. The assembly bases 32 are provided with counterweights 322 and buffer layers 323. The folding protective cover 3 also includes a traction device 33 for assisting in storing the fireproof cloth 31.

[0055] In normal use, the folding protective cover 3 is stored in the limiting storage slot 211 of the assembled storage frame 2. At this time, the fixed connection between the top of the fireproof cloth 31 and the inner wall of the limiting storage slot 211, as well as the several folds on its outer side, achieve neat folding and storage. The two assembled bases 32 at the bottom of the fireproof cloth 31 are in a separated state. This separation design allows the assembled bases 32 to be adjusted in conjunction with the rotation of the two rotating mounting rails 21, making it easy to fit the entire assembled storage frame 2 onto the coil of the transformer 1. After the two rotating mounting rails 21 are accurately fitted into the predetermined position and fixed, the two assembled bases 32 are positioned and fixed by the fixing connector 321 to ensure that the folding protective cover 3 remains stable within the limiting storage slot 211.

[0056] When transformer 1 catches fire due to localized high temperatures or other factors, the automatic fire extinguisher activates and delivers extinguishing gas to the guide nozzle 4, causing the internal pressure of the guide nozzle 4 to gradually increase. When the pressure reaches a certain level, it triggers the unlocking action of the limit locking mechanism 24, releasing the limit locking mechanism 24 from fixing the assembly base 32. At this time, the counterweight 322 on the assembly base 32 comes into play. Due to gravity, the counterweight 322 causes the entire fireproof cloth 31 to fall downwards. During the fall, the fireproof cloth 31 unfolds along the pre-set folds and accurately fits onto the outside of the transformer 1 coils. Since the two rotating mounting rails 21 are pre-set accurately on the outside of the transformer 1 coils, they provide a positioning basis for the accurate unfolding of the fireproof cloth 31, enabling the fireproof cloth 31 to effectively separate and protect each coil, preventing the fire from spreading between the coils and reducing the degree of equipment damage. In addition, the buffer layer 323 on the assembly base 32 also helps the fireproof cloth 31 unfold during its descent. When the assembly base 32 falls to contact the transformer 1, the buffer layer 323 can absorb and disperse the impact force, effectively preventing the assembly base 32 from causing impact damage to the transformer 1 due to excessive falling speed, and ensuring the safety of the transformer 1.

[0057] Meanwhile, multiple threading holes on the fireproof cloth 31 are used to install the traction device 33. The traction device 33 can effectively control the folding state of the fireproof cloth 31 by pulling it out, making the fireproof cloth 31 more stable when stored.

[0058] See Figures 3 to 9 As shown, the traction device 33 includes two rotating take-up shafts 331 rotatably mounted on the rotating mounting rail 21. Each rotating take-up shaft 331 is equipped with a traction rope 332. The end of the traction rope 332 away from the rotating take-up shaft 331 passes through the wire hole of the fireproof cloth 31 and is connected to the assembly base 32. The traction device 33 also includes a synchronous transmission mechanism 333 installed on the side of the assembly storage frame 2. The synchronous transmission mechanism 333 is detachably connected to the assembly storage frame 2. The synchronous transmission mechanism 333 is equipped with a gear transmission assembly inside. The drive end of the gear transmission assembly is equipped with a drive handle 3332. The output end of the gear transmission assembly is equipped with two transmission shafts 3331. The transmission shafts 3331 are connected to the rotating take-up shafts 331 in a transmission manner.

[0059] When transformer 1 catches fire due to localized high temperatures or other factors, the automatic fire extinguisher activates and delivers extinguishing gas to the guide nozzle 4. The increased internal pressure of the guide nozzle 4 triggers the limit locking mechanism 24 to unlock, releasing the fixation of the assembly base 32. Under the influence of gravity, the counterweight 322 on the assembly base 32 causes the fireproof cloth 31 to fall and unfold. At this time, the traction rope 332 stretches synchronously as the fireproof cloth 31 and the assembly base 32 fall. The rotating reel 331 rotates under the tension of the traction rope 332, releasing the traction rope 332 wrapped around it, thus providing conditions for the smooth unfolding of the fireproof cloth 31.

[0060] When the fireproof cloth 31 needs to be rolled up and reset after the fire is extinguished, the staff will install the synchronous transmission mechanism 333 onto the side of the assembled storage frame 2. The synchronous transmission mechanism 333 and the assembled storage frame 2 are detachably connected, which is convenient for installation and disassembly. After installation, the two transmission shafts 3331 are fixedly connected to the rotating winding shaft 331 with bolts.

[0061] Subsequently, the operator rotates the drive handle 3332, which in turn drives the gear transmission assembly. The gear transmission assembly, through internal gear meshing and other transmission methods, synchronously transmits the rotational motion of the drive handle 3332 to the two drive shafts 3331, causing them to rotate synchronously. Since the drive shafts 3331 are connected to the rotating take-up shaft 331, the rotation of the drive shafts 3331 drives the rotating take-up shaft 331 to rotate synchronously.

[0062] As the winding shaft 331 rotates, the traction rope 332 is gradually wound up. With the winding of the traction rope 332, the assembly base 32, connected to the other end of the traction rope 332, is lifted. Simultaneously, the traction rope 332 guides the fireproof cloth 31 to fold and retract along preset creases during the ascent. This synchronous transmission and winding method effectively improves the stability and speed of storing the fireproof cloth 31, ensuring that the fireproof cloth 31 can be quickly and neatly restored to its initial stored state, preparing for the next possible fire.

[0063] See Figures 3 to 10 As shown, the guide nozzle 4 is provided with two multi-angle nozzles 41, which are distributed on the rotating mounting rail 21. The upper nozzle 42 is provided above the multi-angle nozzle 41, and multiple lower nozzles 43 are provided below the multi-angle nozzle 41. The lower nozzles 43 are connected to the interior of the rotating mounting rail 21. The lower part of the multi-angle nozzle 41 is also provided with an insertion channel 44, which is connected to the interior of the multi-angle nozzle 41. The insertion channel 44 is used for sliding installation of the sealing plug 2464.

[0064] When transformer 1 catches fire due to localized high temperatures or other factors, the automatic fire extinguisher activates, delivering the stored extinguishing gas under pressure to the guide nozzle 4. As the extinguishing gas is continuously input, its internal pressure gradually increases. A insertion channel 44 is located below the multi-angle nozzle 41, and the sealing block 2464 of the pneumatic pushing mechanism 246 is slidably installed within this channel 44. During normal operation of transformer 1, the pressure inside the guide nozzle 4 is within the normal range, and the sealing block 2464 remains sealed within the multi-angle nozzle 41, with the airflow slope 2465 on the side of the sealing block 2464 not subjected to significant pressure. When the automatic fire extinguisher activates after a fire, the pressure inside the guide nozzle 4 increases, and the high-pressure extinguishing gas acts on the airflow slope 2465 on the side of the sealing block 2464. Because the airflow ramp 2465 is at a certain angle to the direction of fire extinguishing gas flow, the high-pressure fire extinguishing gas exerts a downward pushing force on the airflow ramp 2465, pushing the sealing plug 2464 to slide downward along the insertion channel 44 inside the guide nozzle 4.

[0065] As the blocking block 2464 moves downward, it simultaneously drives the connecting bracket 2463 connected to it to move downward. Multiple inclined blocks 2461 installed below the connecting bracket 2463 move downward together with the connecting bracket 2463. The pushing inclined surface 2462 on the side of the inclined block 2461 contacts the L-shaped hook 242 of the limiting latching mechanism 24. During the downward movement of the inclined block 2461, relative movement occurs between the pushing inclined surface 2462 and the L-shaped hook 242. The pushing inclined surface 2462 applies a horizontal pushing force to the L-shaped hook 242, pushing the L-shaped hook 242 to slide on the fixed mounting bracket 241, causing the L-shaped hook 242 to gradually disengage from the latching state at the bottom of the folding protective cover 3, thereby realizing the unlocking action of the limiting latching mechanism 24.

[0066] The guide nozzle 4 is equipped with two multi-angle nozzles 41, distributed on the rotating mounting rail 21. The multi-angle nozzles 41 have an upper nozzle 42 above them and multiple lower nozzles 43 below them, with the lower nozzles 43 communicating with the interior of the rotating mounting rail 21. When the extinguishing gas enters the guide nozzle 4, a portion of the extinguishing gas is delivered through the lower nozzles 43 to the gap between the folded protective cover 3 and the transformer 1. Due to the small flow gaps between the folded protective cover 3, the extinguishing gas can quickly flow through these gaps and fill the entire interior space of the protective cover. Compared to the traditional method of filling large cavities with extinguishing gas, this significantly improves the filling speed of the extinguishing gas, thereby effectively enhancing the extinguishing efficiency. Simultaneously, another portion of the extinguishing gas is sprayed through the upper nozzles 42 towards the wiring connection area of ​​the transformer 1. This multi-angle spraying method ensures that all critical parts of the transformer 1 are covered by the extinguishing gas, achieving comprehensive fire extinguishing treatment. Specific working principle: Before using transformer 1, multiple fire-prevention partitions are installed at corresponding positions on the transformer 1 coils. The assembled storage frame 2 is fixedly installed above the transformer 1 coils, providing support. During normal use, the folding protective cover 3 is stored inside the assembled storage frame 2, which limits and secures it, ensuring stability and preventing interference with the normal operation of transformer 1. Simultaneously, a smoke sensor is installed at a suitable position above transformer 1 to monitor for fire in the transformer 1 area in real time.

[0067] When transformer 1 catches fire due to factors such as localized high temperature, the smoke produced by the combustion rises and spreads to the area where the smoke sensor is located. The smoke sensor detects the smoke and determines that a fire has occurred in the area of ​​transformer 1, and then sends an activation signal to the automatic fire extinguisher connected to the system.

[0068] Upon receiving the activation signal from the smoke sensor, the automatic fire extinguisher immediately begins operation. The extinguishing gas stored inside is then delivered under pressure to the guide nozzle 4. The guide nozzle 4 serves as the delivery channel for the extinguishing gas, and its internal pressure gradually increases as it receives the gas.

[0069] When the internal pressure of the guide nozzle 4 rises to a certain level, this pressure will push the fixed end of the assembly and storage frame 2. This releases the fixed end of the assembly and storage frame 2 from its limiting fixation on the folding protective cover 3, allowing the folding protective cover 3 to fall under its own weight and accurately fit onto the outside of the transformer 1 coil, achieving effective isolation and protection for each coil, preventing the fire from spreading between the coils, and reducing the degree of equipment damage.

[0070] The guide nozzle 4 sprays the extinguishing gas into the unfolded folded protective cover 3. Due to the small flow gaps between the folded protective covers 3, the extinguishing gas can quickly flow through these gaps and fill the entire interior space of the protective cover. Compared to the traditional method of filling large cavities with extinguishing gas, this significantly increases the filling speed of the extinguishing gas, thereby effectively improving fire extinguishing efficiency. Simultaneously, the guide nozzle 4 also sprays some of the extinguishing gas towards the wiring connection area of ​​the transformer 1, ensuring that all critical parts of the transformer 1 are covered by the extinguishing gas, achieving comprehensive fire extinguishing, further controlling the fire, and reducing problems such as the expansion of damage to the transformer 1, increased repair difficulty, and greater economic losses caused by delayed fire extinguishing.

[0071] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A dry-type transformer with insulation, fireproof, and self-protection functions, characterized in that, The device includes multiple fire-resistant partitions installed on the coil of the transformer (1). The fire-resistant partitions include an assembly storage frame (2) installed above the coil. A guide nozzle (4) is installed above the assembly storage frame (2). The guide nozzle (4) is used to deliver extinguishing gas into and above the assembly storage frame (2). An automatic fire extinguisher is installed on the side of the guide nozzle (4). The output end of the automatic fire extinguisher is connected to the input end of the guide nozzle (4). The automatic fire extinguisher is used to deliver extinguishing gas into the guide nozzle (4). A folding protective cover (3) is also installed inside the assembly storage frame (2). The fitting end of the folding protective cover (3) extends downward. The folding protective cover (3) is used to fire-isolate the transformer (1). The folding protective cover (3) is fitted on the outside of the transformer (1) and can guide the extinguishing gas to flow along the outer wall of the transformer (1). The fire-resistant partitions also include a smoke sensor installed above the transformer (1). The smoke sensor is connected to the automatic fire extinguisher system. The assembled storage frame (2) consists of two rotating mounting rails (21). One end of the two rotating mounting rails (21) is rotatably connected to each other. The two rotating mounting rails (21) are provided with movable latches (22) at the ends away from each other. The movable latches (22) are used to clamp and fix the two rotating mounting rails (21). The rotating mounting rails (21) are provided with limit storage slots (211). The limit storage slots (211) are used to store folding protective covers (3). Multiple pressure support members (23) are installed on the inner side of the rotating mounting rails (21). The pressure support members (23) are clamped and fixed to the transformer (1). Multiple limit clamping mechanisms (24) are also provided on the side of the rotating mounting rails (21). The limit clamping mechanisms (24) are used to clamp the folding protective covers (3). The limit clamping mechanisms (24) are connected to the guide nozzle (4) in a transmission manner. The limiting latching mechanism (24) includes multiple fixed mounting brackets (241) installed on the side of the rotating mounting rail (21). Each fixed mounting bracket (241) has an L-shaped hook (242) slidably mounted on it. A second spring (243) is installed between the L-shaped hook (242) and the fixed mounting bracket (241). Each L-shaped hook (242) has a push column (244) on both sides. The push column (244) is slidably connected to the fixed mounting bracket (241). A third spring (245) is installed between the push column (244) and the fixed mounting bracket (241). The limiting latching mechanism (24) also includes a pneumatic push mechanism (246) that drives the L-shaped hook (242) to move. The pneumatic push mechanism (246) is connected to the guide nozzle (4).

2. A dry-type transformer with insulation and fireproof self-protection function according to claim 1, characterized in that, The pressure support (23) includes an L-shaped plate (231) installed inside the rotating mounting rail (21). The top of the L-shaped plate (231) is provided with a docking hole. A pressure member is provided above the L-shaped plate (231). The pressure member includes a docking shaft (232). An elastic pressure shaft (233) is slidably installed on the docking shaft (232). A first spring (234) is installed between the elastic pressure shaft (233) and the docking shaft (232).

3. A dry-type transformer with insulation and fireproof self-protection function according to claim 1, characterized in that, The pneumatic pushing mechanism (246) includes a connecting bracket (2463) installed below the guide nozzle (4). The top of the connecting bracket (2463) is provided with a blocking block (2464). The blocking block (2464) extends inward through the guide nozzle (4) and is slidably connected to the guide nozzle (4). The side of the blocking block (2464) is provided with an airflow ramp (2465). Multiple ramp blocks (2461) are installed below the connecting bracket (2463). The ramp blocks (2461) are located between the fixed mounting bracket (241) and the L-shaped hook (242). The side of the ramp blocks (2461) is provided with a pushing ramp (2462).

4. A dry-type transformer with insulation and fireproof self-protection function according to claim 1, characterized in that, The folding protective cover (3) includes a fireproof cloth (31) installed inside the limiting storage slot (211). The fireproof cloth (31) has several folds on its outer side. The top of the fireproof cloth (31) is fixedly connected to the inner wall of the limiting storage slot (211). The fireproof cloth (31) also has multiple wire holes. The bottom of the fireproof cloth (31) is equipped with two assembly bases (32). A fixed connector (321) is installed between the two assembly bases (32). The assembly bases (32) are equipped with counterweights (322) and buffer layers (323). The folding protective cover (3) also includes a traction device (33) for assisting in storing the fireproof cloth (31).

5. A dry-type transformer with insulation and fireproof self-protection function according to claim 4, characterized in that, The traction device (33) includes two rotating take-up shafts (331) rotatably mounted on the rotating mounting rail (21). Each rotating take-up shaft (331) is equipped with a traction rope (332). The end of the traction rope (332) away from the rotating take-up shaft (331) passes through the wire hole of the fireproof cloth (31) and is connected to the assembly base (32). The traction device (33) also includes a synchronous transmission mechanism (333) installed on the side of the assembly storage frame (2). The synchronous transmission mechanism (333) is detachably connected to the assembly storage frame (2). The synchronous transmission mechanism (333) is equipped with a gear transmission assembly inside. The drive end of the gear transmission assembly is equipped with a drive handle (3332). The output end of the gear transmission assembly is equipped with two transmission shafts (3331). The transmission shafts (3331) are connected to the rotating take-up shafts (331) in a transmission connection.

6. A dry-type transformer with insulation and fireproof self-protection function according to claim 3, characterized in that, The guide nozzle (4) is provided with two multi-angle nozzles (41), which are distributed on the rotating mounting rail (21). The multi-angle nozzles (41) are provided with an upper nozzle (42) above them and multiple lower nozzles (43) below them. The lower nozzles (43) are connected to the interior of the rotating mounting rail (21). The multi-angle nozzles (41) are also provided with an insertion channel (44) below them. The insertion channel (44) is connected to the interior of the multi-angle nozzles (41) and is used for sliding installation of the sealing plug (2464).

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