Mining flame-proof dry-type transformer

Abstract

The invention discloses a mining explosion-proof dry-type transformer which comprises an explosion-proof cabinet body and a transformer body installed in the explosion-proof cabinet body, a fire extinguishing assembly is arranged on the top of the explosion-proof cabinet body, and heat dissipation assemblies are arranged on the left side and the right side of the explosion-proof cabinet body. A temperature sensor, a pressure sensor, a smoke sensor and a processor are integrated in the explosion-proof cabinet body, and the temperature sensor, the smoke sensor, the pressure sensor, the heat dissipation assembly and the fire extinguishing assembly are all in signal connection with the processor. According to the invention, the explosion-proof cabinet body utilizes natural heat dissipation, external airflow enters the cabinet body through the arc-shaped grooves at the two sides, the temperature is maintained when the transformer operates normally and the heating value is small, and the explosion-proof cabinet is simple and energy-saving; when the temperature in the cabinet body exceeds a set interval, the processor controls the driving motor to drive related parts to enable the sealing plate to rotate to push airflow and forced ventilation and heat dissipation to be started, and natural heat dissipation and forced ventilation and heat dissipation work cooperatively to flexibly adjust heat dissipation strategies according to different working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a flameproof dry-type transformer for mining. Background Art

[0002] In a mining environment, dry-type transformers generate heat during operation. Traditional heat dissipation methods are inflexible, and single natural heat dissipation or forced ventilation heat dissipation is difficult to cope with different working conditions. Natural heat dissipation is insufficient under high load or high temperature environments, and forced ventilation consumes energy at low heat generation. At the same time, there is a lot of dust in the mining area, and existing dust prevention measures are likely to affect heat dissipation. Dust accumulation will reduce heat dissipation efficiency and affect electrical performance. Existing dust covers have problems of blocking airflow or being difficult to clean.

[0003] If a mining transformer overheats or catches fire, the consequences will be serious due to the large number of flammable materials in the mining area. Traditional fire and explosion prevention measures are single, mostly relying on temperature sensor alarms, lacking initial fire suppression measures, making it difficult to control the spread of fire, and not taking explosion prevention into account during the fire extinguishing process, which cannot effectively protect the transformer and the surrounding environment. Therefore, professionals in this field provide a mining explosion-proof dry-type transformer to solve the above-mentioned problems. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a flameproof dry-type transformer for mining.

[0005] To achieve the above object, the present invention adopts the following technical solution: A mine-use flameproof dry-type transformer comprises an explosion-proof cabinet and a transformer body installed therein, wherein a fire extinguishing assembly is arranged on the top of the explosion-proof cabinet, and heat dissipation assemblies are arranged on the left and right sides of the explosion-proof cabinet. A temperature sensor, a pressure sensor, a smoke sensor and a processor are integrated inside the explosion-proof cabinet, and the temperature sensor, the smoke sensor, the pressure sensor, the heat dissipation assembly and the fire extinguishing assembly are all connected to the processor signal.

[0006] The fire extinguishing assembly includes two servo motors, which are fixedly mounted on the top of the explosion-proof cabinet, and the output shaft of the servo motor penetrates and extends to the interior of the explosion-proof cabinet. A screw is fixedly mounted on the output shaft of the servo motor, and a movable plate is slidably connected to the inner wall of the explosion-proof cabinet, and the movable plate is threadedly connected to the screw. An assembly box is fixedly mounted on the top of the explosion-proof cabinet, and evenly distributed nitrogen cylinders are installed inside the assembly box. The pipeline on the nitrogen cylinder penetrates and extends to the interior of the explosion-proof cabinet and is installed with a control valve. The bottom of the movable plate is threadedly connected with evenly distributed storage cylinders, and the top end of the storage cylinder penetrates and extends to the top of the movable plate. The interior of the storage cylinder is filled with fire extinguishing dry powder, and an electric control valve is installed at the bottom of the storage cylinder; The heat dissipation component includes a mounting plate, which is detachably connected to the side of the explosion-proof cabinet. The mounting plate is provided with arc grooves and expansion grooves arranged at equal distances, and the expansion grooves are arranged corresponding to the arc grooves. A rotating shaft is rotatably connected to the inner wall of the expansion groove, and the rotating shaft passes through the mounting plate and extends to the inside of the arc groove. Two sealing plates are fixedly connected to the rotating shaft, and the sides of the sealing plates away from the rotating shaft are both in contact with the inner wall of the arc groove. A dustproof component is arranged on the mounting plate, and a driving motor is fixedly installed on the inner bottom wall of the explosion-proof cabinet. A synchronous shaft is fixedly installed on the output shaft of the driving motor, and the rotating shaft and the synchronous shaft are connected by a bevel gear transmission.

[0007] As a further description of the above technical solution: the dustproof component includes arc-shaped dust covers arranged at equal distances, the arc-shaped dust covers are detachably connected to a side of a mounting plate located outside the explosion-proof cabinet, the arc-shaped groove is located inside the arc-shaped dust cover, and a mounting groove is provided on a sealing plate at the top of the arc-shaped groove, a power supply electromagnet is fixedly installed on the inner wall of the mounting groove, the top of the power supply electromagnet is magnetically connected to a magnetic block, and the top of the magnetic block is connected to evenly distributed bristles.

[0008] As a further description of the above technical solution: a signal transmission module is integrated inside the explosion-proof cabinet, and the signal transmission module is connected to the processor signal.

[0009] As a further description of the above technical solution: a cavity is opened inside the explosion-proof cabinet, and the inner wall of the cavity is opened with evenly distributed through grooves, and the inner wall of the cavity is fixedly connected with evenly distributed hollow cylinders, and the top and bottom ends of the hollow cylinders are connected to the interior of the through grooves, and the interiors of adjacent hollow cylinders are connected to each other through pipes, and two pistons are slidably installed on the inner wall of the hollow cylinder, and the opposite sides of the two pistons are fixedly connected with heat-conducting rods, and the end of the heat-conducting rod away from the piston is located inside the through groove, and an air pump is fixedly installed on the inner wall of the cavity, and the air pump is connected to the interior of the hollow cylinder.

[0010] As a further description of the above technical solution: the heat conducting rod is made of metal material.

[0011] As a further description of the above technical solution: the side of the movable plate and the inner wall of the explosion-proof cabinet are subjected to sliding sealing treatment, and the evenly distributed storage cylinders are respectively located on the front and back of the transformer body.

[0012] As a further description of the above technical solution: the storage tube is provided with an external thread used in conjunction with the movable plate, and the storage tube is connected with a barrier ring.

[0013] As a further description of the above technical solution: the storage tube is provided with an external thread used in conjunction with the movable plate, and the storage tube is connected with a barrier ring.

[0014] Compared with the prior art, the advantages of the present invention are: (1) In the present invention, the explosion-proof cabinet utilizes natural heat dissipation. External air flows into the cabinet through the arc grooves on both sides, and the temperature is maintained when the transformer is operating normally and the heat generation is small, which is simple and energy-saving. When the temperature inside the cabinet exceeds the set range, the processor controls the drive motor to drive the relevant components to rotate the sealing plate to promote the airflow, and the forced ventilation and heat dissipation are started. The natural heat dissipation and forced ventilation and heat dissipation work together to flexibly adjust the heat dissipation strategy according to different working conditions. The heat-conducting rod in the hollow cylinder assists in heat dissipation. The top heat-conducting rod absorbs the heat of the transformer and introduces it into the hollow cylinder and then into the ground through the bottom. In the summer when the temperature is high or the transformer is under high load for a long time and the ventilation and heat dissipation are limited, the heat dissipation task can be shared, thereby improving the overall heat dissipation efficiency.

[0015] (2) In the present invention, the design of the arc-shaped dust cover can effectively prevent dust while ensuring the heat dissipation of the explosion-proof cabinet. During natural heat dissipation, the arc-shaped dust cover blocks dust in the airflow to prevent the transformer in the mining environment from being corroded by dust. Dust accumulation will affect the heat dissipation performance and even cause malfunctions. If there are no dust prevention measures in the mining area, dust will cover key components and reduce the heat dissipation efficiency. The arc-shaped dust cover does not affect the heat dissipation of the intake air and can prevent dust. When a small amount of dust adheres to its outer side, the processor controls the power supply electromagnet to change the direction of the current, so that the magnetic block pushes out the bristles, and then drives the sealing plate to rotate to use the bristles to clean the dust, ensuring that the dust prevention effect is long-term and effective, and ensuring the continuous and stable operation of the heat dissipation system.

[0016] (3) In the present invention, when the transformer is overheated or on fire, the temperature and smoke sensors are triggered, and the driving motor drives the sealing plate to cover the arc groove and seal the cabinet through the synchronous shaft and the rotating shaft. The servo motor drives the movable plate to move downward to reduce the volume of the space and increase the air pressure to suppress the fire, thereby preventing the fire from spreading in the early stage. For example, the initial air pressure change can suppress the spread of the flame. After the first stage of fire extinguishing, the servo motor rotates in the opposite direction to move the movable plate upward, and the processor opens the control valve to allow the nitrogen in the nitrogen bottle to enter the top of the cabinet to form high pressure, and then opens the electric control valve to allow the nitrogen to bring out the dry powder. The nitrogen contacts the dry powder to form a powder cloud to reduce the oxygen content. The combination of the two effectively extinguishes the fire and prevents explosion, protecting the transformer and the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 4 For the present invention Figure 2 The enlarged structural diagram at B in the middle; Figure 5 It is a schematic diagram of the three-dimensional structure of the storage tube of the present invention; Figure 6 It is a schematic diagram of the side view structure of the expansion groove of the present invention; Figure 7 It is a schematic diagram of the principle of the present invention.

[0018] Description of the numbers in the figure: 1. Explosion-proof cabinet; 2. Transformer body; 3. Fire extinguishing assembly; 301. Servo motor; 302. Movable plate; 303. Assembly box; 304. Nitrogen bottle; 305. Control valve; 306. Storage cylinder; 307. Electric control valve; 4. Heat dissipation assembly; 401. Mounting plate; 402. Arc groove; 403. Expansion groove; 404. Rotating shaft; 405. Sealing plate; 406. Dustproof assembly; 4061. Arc dust cover; 4062, mounting slot; 4063, power electromagnet; 4064, magnetic block; 4065, bristles; 407, drive motor; 408, synchronous shaft; 5, temperature sensor; 6, pressure sensor; 7, smoke sensor; 8, processor; 9, signal transmission module; 10, cavity; 11, through slot; 12, hollow cylinder; 13, piston; 14, heat-conducting rod; 15, air pump; 16, barrier ring; 17, limit ring. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention; See also Figures 1 to 7 In the present invention, a mine flameproof dry-type transformer includes an explosion-proof cabinet 1 and a transformer body 2 installed therein, a fire extinguishing assembly 3 is arranged on the top of the explosion-proof cabinet 1, and heat dissipation assemblies 4 are arranged on the left and right sides of the explosion-proof cabinet 1, and a temperature sensor 5, a pressure sensor 6, a smoke sensor 7 and a processor 8 are integrated inside the explosion-proof cabinet 1, and the temperature sensor 5, the smoke sensor 7, the pressure sensor 6, the heat dissipation assembly 4 and the fire extinguishing assembly 3 are all connected to the processor 8 signal.

[0020] The fire extinguishing assembly 3 includes two servo motors 301, which are fixedly installed on the top of the explosion-proof cabinet 1. The output shaft of the servo motor 301 penetrates and extends into the interior of the explosion-proof cabinet 1. A screw is fixedly installed on the output shaft of the servo motor 301. A movable plate 302 is slidably connected to the inner wall of the explosion-proof cabinet 1. The movable plate 302 is threadedly connected to the screw. An assembly box 303 is fixedly installed on the top of the explosion-proof cabinet 1. Evenly distributed nitrogen bottles 304 are installed inside the assembly box 303. The pipes on the nitrogen bottles 304 penetrate and extend into the interior of the explosion-proof cabinet 1 and are installed with a control valve 305. Evenly distributed storage cylinders 306 are threadedly connected to the bottom of the movable plate 302. The top of the storage cylinder 306 penetrates and extends to the top of the movable plate 302. The interior of the storage cylinder 306 is filled with fire extinguishing dry powder, and an electric control valve 307 is installed at the bottom of the storage cylinder 306.

[0021] The heat dissipation component 4 includes a mounting plate 401, which is detachably connected to the side of the explosion-proof cabinet 1. The mounting plate 401 is provided with arc grooves 402 and expansion grooves 403 arranged at equal distances. The expansion grooves 403 are arranged corresponding to the arc grooves 402. A rotating shaft 404 is rotatably connected to the inner wall of the expansion groove 403. The rotating shaft 404 passes through the mounting plate 401 and extends to the inside of the arc groove 402. Two sealing plates 405 are fixedly connected to the rotating shaft 404. The sides of the sealing plates 405 away from the rotating shaft 404 are both in contact with the inner wall of the arc groove 402. A dustproof component 406 is arranged on the mounting plate 401. A driving motor 407 is fixedly installed on the inner bottom wall of the explosion-proof cabinet 1. A synchronous shaft 408 is fixedly installed on the output shaft of the driving motor 407. The rotating shaft 404 and the synchronous shaft 408 are connected by bevel gear transmission.

[0022] The dustproof component 406 includes arc-shaped dust covers 4061 arranged at equal distances, and the arc-shaped dust covers 4061 are detachably connected to a side of the mounting plate 401 located outside the explosion-proof cabinet 1. The arc-shaped groove 402 is located inside the arc-shaped dust cover 4061. A mounting groove 4062 is provided on the sealing plate 405 at the top in the arc-shaped groove 402. A power supply electromagnet 4063 is fixedly installed on the inner wall of the mounting groove 4062. The top of the power supply electromagnet 4063 is magnetically connected to a magnetic block 4064, and the top of the magnetic block 4064 is connected to evenly distributed bristles 4065.

[0023] A cavity 10 is provided inside the explosion-proof cabinet 1, and evenly distributed through grooves 11 are provided on the inner wall of the cavity 10. Evenly distributed hollow cylinders 12 are fixedly connected to the inner wall of the cavity 10, and the top and bottom ends of the hollow cylinders 12 are communicated with the interior of the through grooves 11, and the interiors of adjacent hollow cylinders 12 are communicated with each other through pipes. Two pistons 13 are slidably installed on the inner wall of the hollow cylinder 12, and heat-conducting rods 14 are fixedly connected to the opposite sides of the two pistons 13, and the end of the heat-conducting rod 14 away from the piston 13 is located inside the through groove 11, and an air pump 15 is fixedly installed on the inner wall of the cavity 10, and the air pump 15 is communicated with the interior of the hollow cylinder 12.

[0024] The heat conducting rod 14 is made of metal material; the side of the movable plate 302 and the inner wall of the explosion-proof cabinet 1 are slidingly sealed, and the evenly distributed storage cylinders 306 are respectively located on the front and back of the transformer body 2.

[0025] The middle positions of the multiple groups of hollow cylinders 12 inside the cavity 10 are connected by pipes, and the air pressure inside the multiple groups of pipes is controlled by the air pump 15. The mining dry-type transformer is installed outdoors and needs to be supported by a concrete platform before installation. During the stacking process, holes corresponding to the multiple groups of heat-conducting rods 14 can be left empty. If there is no condition to assemble it directly on the ground, holes can also be drilled by a drilling tool.

[0026] Move the explosion-proof cabinet 1 loaded with the dry-type transformer body 2 to the installation position so that the explosion-proof cabinet 1 is at the top of the opened hole, and then the user controls the air pump 15 to operate. After the air pump 15 is powered on, suction is generated to send the airflow into the pipe connected to the inside of the hollow cylinder 12, so that the airflow quickly fills the pipe and the center position of the hollow cylinder 12, so that the air pressure inside the hollow cylinder 12 increases, and then the piston 13 inside the hollow cylinder 12 starts to slide, and the top piston 13 pushes the heat-conducting rod 14 through the through groove 11 and enters the inside of the explosion-proof cabinet 1 at the side of the transformer body 2, while the bottom piston 13 pushes the heat-conducting rod 14 into the hole opened at the bottom, and the positioning installation is completed at this time.

[0027] When the door of the explosion-proof cabinet is closed, the heat dissipation components 4 on both sides realize the heat dissipation function, the movable plate 302 inside the explosion-proof cabinet is at the top, and the temperature sensor 5 inside the explosion-proof cabinet monitors the internal temperature of the explosion-proof cabinet in real time. During the operation of the transformer body 2, heat is released, and the airflow outside the explosion-proof cabinet enters the explosion-proof cabinet through the multiple groups of arc grooves 402 on both sides, so that the heat is attached and discharged to achieve cooling and heat dissipation, and the dust in the airflow is blocked by the arc dust cover 4061 and cannot enter the interior of the explosion-proof cabinet, avoiding the transformer in the mining area The device body 2 is corroded by dust. If the natural heat dissipation cannot meet the heat dissipation demand and the internal temperature of the explosion-proof cabinet is kept outside the set range, the processor 8 will automatically control the operation of the drive motor 407, and the drive motor 407 drives the synchronous shaft 408 fixedly connected to it to rotate. The multiple sets of bevel teeth on the synchronous shaft 408 will drive the multiple sets of rotating shafts 404 to rotate, and the sealing plate 405 connected to the rotating shaft 404 begins to rotate inside the arc groove 402, thereby promoting the airflow to accelerate the circulation speed of the airflow and improve the ventilation and heat dissipation efficiency until the temperature drops to the set range.

[0028] During the above heat dissipation process, the metal heat-conducting rod 14 at the top of the hollow tube 12 will also absorb the heat near the transformer, and then introduce it into the hollow tube 12 and then into the ground through the heat-conducting rod 14 at the bottom to achieve auxiliary heat dissipation and improve heat dissipation efficiency.

[0029] During the heat dissipation process, a small amount of dust will adhere to the outside of the arc-shaped dust cover 4061. The processor 8 can control the power electromagnet 4063 to change the current direction to produce the same magnetic pole as the magnetic block 4064, so that the magnetic block 4064 moves away from the power electromagnet 4063 to push the bristles 4065 out of the installation groove 4062. Then, by driving the sealing plate 405 to rotate, the dust attached to the arc-shaped dust cover 4061 can be removed through the bristles 4065 to avoid blockage affecting the air intake effect.

[0030] If overheating or open flame occurs during the operation of the transformer body 2, the temperature sensor 6 and the smoke sensor 7 will be triggered, and the processor 8 will control the fire extinguishing component 3 and the heat dissipation component 4 to operate quickly. The driving motor 407 in the heat dissipation component 4 drives the rotating shaft to rotate through the synchronous shaft 408, so that the sealing plate 405 blocks the arc groove 402 to complete the sealing inside the explosion-proof cabinet 1, and then the servo motor 301 is controlled to rotate quickly to drive the screw rod fixedly connected to it to rotate, and the movable plate 302 threadedly connected to the screw rod moves down quickly, and the movable plate 302 moves down quickly to the critical point. This action quickly reduces the volume of the space where the transformer body 2 is located, thereby increasing the air pressure in the space. The increased air pressure can slow down or temporarily suppress the fire, reduce the concentration of oxygen, make combustion difficult, and form a first-order The processor 8 then controls the servo motor 301 to rotate in the opposite direction. At this time, the speed of the servo motor 301 slows down, and the movable plate 302 moves vertically upward. The processor 8 opens the control valve 305. At this time, the high-pressure nitrogen stored in the nitrogen bottle 304 begins to enter the explosion-proof cabinet 1 through the pipeline and is at the top of the movable plate 302 to form a high pressure. Then the processor 8 controls the electric control valve 307 to start. At this time, the nitrogen bottle 304 is still releasing nitrogen. The airflow enters the multiple groups of storage cylinders 306 and is discharged through the electric control valve 307. At this time, the fire extinguishing dry powder in the storage cylinder 306 will also be sprayed to the bottom of the movable plate 302 with the nitrogen. The nitrogen and dry powder are in full contact to quickly form a powder cloud and reduce the oxygen content inside the explosion-proof cabinet 1, thereby realizing the second stage of fire extinguishing and further realizing explosion protection.

[0031] In the present invention, firstly, the natural heat dissipation method is utilized. The airflow outside the explosion-proof cabinet 1 can enter the interior of the cabinet through multiple groups of arc grooves 402 on both sides to realize the natural dissipation of heat. This natural heat dissipation method is simple and energy-saving, and can effectively maintain the temperature inside the cabinet within a certain range when the transformer is operating normally and the heat generation is small. When natural heat dissipation cannot meet the demand, that is, the temperature inside the explosion-proof cabinet 1 exceeds the set range, the forced ventilation and heat dissipation mechanism is started, and the processor 8 controls the operation of the drive motor 407. The drive motor 407 drives the synchronous shaft 408 to rotate, thereby driving the multiple groups of rotating shafts 404 to rotate, and the sealing plate 405 connected to the rotating shaft 404 begins to rotate inside the arc groove 402 to push the airflow, thereby accelerating the circulation speed of the airflow and improving the ventilation and heat dissipation efficiency. The coordinated work of this natural heat dissipation and forced ventilation and heat dissipation can flexibly adjust the heat dissipation strategy according to actual heat dissipation needs, to ensure that the transformer can obtain effective heat dissipation under different working conditions, and avoid To avoid affecting performance or causing safety problems due to overheating, for example, when the ambient temperature in the mining area is low and the transformer load is small, natural heat dissipation is sufficient to cope with it, and in a high temperature environment or when the transformer is running at a high load, forced ventilation heat dissipation can intervene in time to ensure the heat dissipation effect, and the heat-conducting rod 14 inside the hollow cylinder 12 plays an auxiliary heat dissipation role in the heat dissipation process. During the operation of the transformer, the metal heat-conducting rod 14 on the top will absorb the heat near the transformer, and then introduce the heat into the hollow cylinder 12, and then introduce it into the underground through the bottom heat-conducting rod 14. This method of conducting the heat of the transformer to the underground through the heat-conducting rod 14 is combined with natural heat dissipation and forced ventilation heat dissipation to further improve the overall heat dissipation efficiency. For example, in high temperature weather in summer or when the transformer is running at a high load for a long time, even if the ventilation heat dissipation is subject to certain restrictions, the auxiliary heat dissipation of the heat-conducting rod 14 can share part of the heat dissipation task and reduce the pressure of other heat dissipation methods.

[0032] The present invention effectively prevents dust from entering the explosion-proof cabinet 1 while ensuring heat dissipation through the design of the arc-shaped dust cover 4061. During the natural heat dissipation process, although the external airflow enters the cabinet through the arc-shaped groove 402 to achieve heat dissipation, the dust in the airflow will be blocked by the arc-shaped dust cover 4061. This design prevents the transformer body in the mining environment from being eroded by dust, because the accumulation of dust may affect the heat dissipation performance of the transformer and may even cause electrical failures. For example, in a dusty environment such as a mining area, if there are no effective dust prevention measures, dust may cover the heat sink or other key components of the transformer, reducing the heat dissipation efficiency. The arc-shaped dust cover 4061 can prevent the transformer body from being eroded by dust without affecting the heat dissipation efficiency. Under the premise of allowing air flow to enter for heat dissipation, dust is prevented from entering, and when a small amount of dust adheres to the outside of the arc-shaped dust cover 4061, the processor 8 controls the power electromagnet 4063 to change the direction of current, generating the same magnetic pole as the magnetic block 4064, so that the magnetic block 4064 is away from the power electromagnet 4063 to push the bristles 4065 out of the mounting groove 4062, and by driving the sealing plate 405 to rotate, the bristles 4065 are used to remove the dust attached to the arc-shaped dust cover 4061. This automatic dust cleaning function can ensure that the dust-proof effect of the arc-shaped dust cover 4061 is long-term and effective, and the arc groove will not be blocked by dust accumulation, affecting the air intake effect, thereby ensuring the continuous and stable operation of the heat dissipation system.

[0033] In the present invention, when the transformer body 2 is overheated or an open flame occurs, after the temperature sensor 5 and the smoke sensor 7 are triggered, the drive motor 407 in the heat dissipation component 4 drives the rotating shaft 404 to rotate through the synchronous shaft 408, so that the sealing plate 405 blocks the arc groove 402, completing the sealing inside the explosion-proof cabinet 1. Subsequently, the servo motor 301 rotates rapidly to drive the screw rod to rotate, and the movable plate 302 threadedly connected to the screw rod moves down rapidly to the critical point, reducing the volume of the space where the transformer body 2 is located and increasing the air pressure in the space. This process can quickly suppress the fire because the increased air pressure can reduce the concentration of oxygen, making combustion difficult. This initial rapid fire extinguishing measure can intervene in the first time when a fire occurs, prevent the fire from spreading further, and buy time for subsequent fire extinguishing work. For example, in the early stage of a fire, this rapid air pressure change can be effective. The flame spread is effectively suppressed, and the damage of the fire to the transformer and the surrounding environment is reduced. After the first stage of fire extinguishing, the processor 8 controls the servo motor 301 to rotate in the opposite direction, and the movable plate 302 moves vertically upward. At the same time, the processor 8 opens the control valve 305, and the high-pressure nitrogen in the nitrogen bottle 304 enters the top of the movable plate inside the explosion-proof cabinet 1 to form a high pressure. The processor 8 controls the electric control valve 307 to open, and the nitrogen bottle 304 continues to release nitrogen. The airflow enters the interior of the multiple groups of storage cylinders 306 and brings out the fire extinguishing dry powder. The nitrogen and the dry powder are fully in contact to form a powder cloud and reduce the oxygen content inside the explosion-proof cabinet 1, so as to realize the second stage of fire extinguishing. The combined use of nitrogen and dry powder not only utilizes the inertness of nitrogen to reduce the oxygen concentration, but also utilizes the fire extinguishing characteristics of dry powder, which can more comprehensively and effectively extinguish the fire, and at the same time realize the explosion-proof function to protect the safety of the transformer and the surrounding environment.

[0034] See also Figure 7 , wherein: a signal transmission module 9 is integrated inside the explosion-proof cabinet 1 , and the signal transmission module 9 is connected to the processor 8 by signal.

[0035] In the present invention, during the operation of the equipment, the processor 8 can transmit and receive signals through the signal transmission module 9, so that the transformer status can be transmitted to the maintenance personnel in time, and the equipment status can be understood in time.

[0036] See also Figure 5 , wherein: the storage tube 306 is provided with an external thread for use with the movable plate 302 , and the storage tube 306 is connected with a blocking ring 16 .

[0037] In the present invention, the threaded storage tube 306 is easy to disassemble and maintain, and the dry powder can be replaced and filled. When the storage tube 306 is connected, the barrier ring 16 can be positioned and the sealing effect can be improved to prevent nitrogen from escaping.

[0038] See also Figure 2, wherein: a limit ring 17 is fixedly connected to the inner wall of the explosion-proof cabinet 1, the limit ring 17 is located at the bottom of the movable plate 302, and a sealing gasket is connected to the top of the limit ring 17.

[0039] In the present invention, the movable plate 302 will contact the limiting ring 17 during the process of rapid downward movement. The sealing gasket on the top of the limiting ring 17 can play a certain buffering effect, thereby improving the sealing performance and avoiding significant wear.

[0040] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flameproof dry-type transformer for use in mining, comprising an explosion-proof cabinet (1) and a transformer body (2) installed therein, characterized in that: A fire extinguishing assembly (3) is arranged on the top of the explosion-proof cabinet (1); heat dissipation assemblies (4) are arranged on both the left and right sides of the explosion-proof cabinet (1); a temperature sensor (5), a pressure sensor (6), a smoke sensor (7) and a processor (8) are integrated inside the explosion-proof cabinet (1); the temperature sensor (5), the smoke sensor (7), the pressure sensor (6), the heat dissipation assembly (4) and the fire extinguishing assembly (3) are all signal-connected to the processor (8); The fire extinguishing assembly (3) comprises two servo motors (301), the servo motors (301) are fixedly mounted on the top of the explosion-proof cabinet (1), the output shaft of the servo motor (301) penetrates and extends into the interior of the explosion-proof cabinet (1), a screw is fixedly mounted on the output shaft of the servo motor (301), a movable plate (302) is slidably connected to the inner wall of the explosion-proof cabinet (1), the movable plate (302) is threadedly connected to the screw, an assembly box (303) is fixedly mounted on the top of the explosion-proof cabinet (1), The assembly box (303) is internally installed with uniformly distributed nitrogen cylinders (304), the pipeline on the nitrogen cylinder (304) penetrates and extends to the interior of the explosion-proof cabinet (1) and is installed with a control valve (305), the bottom of the movable plate (302) is threadedly connected with uniformly distributed storage cylinders (306), the top of the storage cylinder (306) penetrates and extends to the top of the movable plate (302), the interior of the storage cylinder (306) is filled with fire extinguishing dry powder, and the bottom of the storage cylinder (306) is installed with an electric control valve (307); The heat dissipation assembly (4) comprises a mounting plate (401), the mounting plate (401) being detachably connected to the side of the explosion-proof cabinet (1), the mounting plate (401) being provided with arc grooves (402) and expansion grooves (403) arranged at equal distances, the expansion grooves (403) being arranged corresponding to the arc grooves (402), a rotating shaft (404) being rotatably connected to the inner wall of the expansion groove (403), the rotating shaft (404) penetrating the mounting plate (401) and extending to the interior of the arc groove (402), Two sealing plates (405) are fixedly connected to the rotating shaft (404), and the sides of the sealing plates (405) away from the rotating shaft (404) are both in contact with the inner wall of the arc groove (402). A dustproof component (406) is provided on the mounting plate (401). A driving motor (407) is fixedly mounted on the inner bottom wall of the explosion-proof cabinet (1). A synchronous shaft (408) is fixedly mounted on the output shaft of the driving motor (407). The rotating shaft (404) and the synchronous shaft (408) are connected via a bevel gear transmission.

2. A mine flameproof dry-type transformer according to claim 1, characterized in that: The dustproof component (406) comprises arc-shaped dustproof covers (4061) arranged at equal distances, the arc-shaped dustproof covers (4061) are detachably connected to a side of a mounting plate (401) located outside the explosion-proof cabinet (1), the arc-shaped groove (402) is located inside the arc-shaped dustproof cover (4061), a mounting groove (4062) is provided on a sealing plate (405) at the top of the arc-shaped groove (402), a power supply electromagnet (4063) is fixedly installed on the inner wall of the mounting groove (4062), a magnetic block (4064) is magnetically connected to the top of the power supply electromagnet (4063), and evenly distributed bristles (4065) are connected to the top of the magnetic block (4064).

3. A mine flameproof dry-type transformer according to claim 1, characterized in that: A signal transmission module (9) is integrated inside the explosion-proof cabinet (1), and the signal transmission module (9) is signal-connected to the processor (8).

4. The flameproof dry-type transformer for mining according to claim 1, characterized in that: The explosion-proof cabinet (1) has a cavity (10) formed inside, and the inner wall of the cavity (10) has evenly distributed through grooves (11). Evenly distributed hollow cylinders (12) are fixedly connected to the inner wall of the cavity (10). The top and bottom ends of the hollow cylinders (12) are both in communication with the inside of the through grooves (11), and the insides of adjacent hollow cylinders (12) are in communication with each other through pipes. Two pistons (13) are slidably mounted on the inner wall of the hollow cylinder (12), and heat-conducting rods (14) are fixedly connected to opposite sides of the two pistons (13). One end of the heat-conducting rod (14) away from the piston (13) is located inside the through grooves (11). An air pump (15) is fixedly mounted on the inner wall of the cavity (10), and the air pump (15) is in communication with the inside of the hollow cylinder (12).

5. A mine flameproof dry-type transformer according to claim 4, characterized in that: The heat conducting rod (14) is made of metal material.

6. The flameproof dry-type transformer for mining according to claim 1, characterized in that: The side edge of the movable plate (302) and the inner wall of the explosion-proof cabinet (1) are subjected to sliding sealing treatment, and the evenly distributed storage cylinders (306) are respectively located on the front and back of the transformer body (2).

7. The flameproof dry-type transformer for mining according to claim 1, characterized in that: The storage tube (306) is provided with an external thread for use with the movable plate (302), and the storage tube (306) is connected to a barrier ring (16).

8. The flameproof dry-type transformer for mining according to claim 1, characterized in that: A limit ring (17) is fixedly connected to the inner wall of the explosion-proof cabinet (1), the limit ring (17) is located at the bottom of the movable plate (302), and a sealing gasket is connected to the top of the limit ring (17).

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