Fireproof safety equipment for oil-immersed transformer

Abstract

The utility model discloses fireproof safety equipment for an oil-immersed transformer, and relates to the technical field of oil-immersed transformers, the fireproof safety equipment comprises a control cabinet, a detection device, an oil-immersed transformer body, a fire-fighting cabinet, an oil discharge system and a nitrogen injection system, the fire-fighting cabinet is communicated to the upper end of the interior of the oil-immersed transformer body through the oil discharge system; the fire-fighting cabinet is communicated to the bottom end of the interior of the oil-immersed transformer body through a nitrogen injection system, two nitrogen tanks are arranged in the fire-fighting cabinet, the two nitrogen tanks are arranged in parallel, and adjusting devices are movably connected to the nitrogen tanks; the problems that in the prior art, when a fire extinguishing device is used after an accident occurs, the nitrogen content in a nitrogen tank is reduced or even exhausted, the nitrogen tank needs to be dismantled for inflation, a plurality of screws on fasteners of two nitrogen cylinders need to be manually screwed off and loosened in sequence for the nitrogen tank in an original fire-fighting cabinet, the steps are complicated, the consumed time is long, and the cost is low in the prior art are solved. When the nitrogen tank is dragged outwards, the stability is poor, and the nitrogen tank is prone to toppling and even being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-immersed transformers, in particular to a fire safety device for oil-immersed transformers. Background Art

[0002] Oil-immersed power transformers are one of the most important equipment in power stations and substations. The transformer body contains a large amount of flammable substances. When the transformer catches fire, high temperature and high pressure are generated. The burning substances will be sprayed to nearby equipment with the flames. Therefore, special attention should be paid to the protection of transformers in power stations and substations.

[0003] Transformer combustion is generally caused by internal insulation damage, mainly due to overload, operating overvoltage and lightning overvoltage, gradual insulation degradation, etc. The energy generated by the arc caused by electrical faults causes the temperature and pressure to accumulate inside the transformer body, forcing the transformer cover to fly off or causing the body to be damaged, and a large amount of fuel gushed out over a large area, causing the fire to spread.

[0004] At present, oil-immersed transformers are equipped with oil-draining and nitrogen-injecting fire-extinguishing equipment, which includes a control cabinet, a detection device, an oil-immersed transformer body, a fire cabinet, an oil-draining system and a nitrogen-injecting system. Two nitrogen tanks are installed in the fire cabinet, and the two nitrogen tanks are fixed in sequence by tightening the fasteners with screws. When the fire extinguishing device is used after an accident, the nitrogen content in the nitrogen tank is reduced or even exhausted. At this time, the nitrogen tank needs to be removed for inflation. At this time, the nitrogen tank in the original fire cabinet needs to manually unscrew multiple screws on the fasteners of the two nitrogen bottles in sequence to loosen the fasteners. The steps are complicated and time-consuming. The stability is poor when the nitrogen tank is dragged out, and it is easy to tip over or even be damaged. Utility Model Content

[0005] The embodiment of the present application provides a fire safety device for an oil-immersed transformer, which solves the problem in the prior art that when a fire extinguishing device is used after an accident occurs, the nitrogen content in the nitrogen tank is reduced or even exhausted. At this time, the nitrogen tank needs to be removed for inflation. At this time, the nitrogen tank in the original fire cabinet needs to be manually unscrewed in sequence on multiple screws on the fasteners of two nitrogen bottles to loosen the fasteners. The steps are complicated and time-consuming. When the nitrogen tank is dragged outward, the stability is poor and it is easy to tip over or even be damaged.

[0006] The embodiment of the present application provides a fire safety device for an oil-immersed transformer, including a control cabinet, a detection device, an oil-immersed transformer body, a fire cabinet, an oil drainage system, and a nitrogen injection system. The fire cabinet is connected to the upper end of the oil-immersed transformer body through the oil drainage system, and the fire cabinet is connected to the lower end of the oil-immersed transformer body through the nitrogen injection system. There are two nitrogen tanks inside the fire cabinet, and the two nitrogen tanks are arranged in parallel. An adjustment device is movably connected to the nitrogen tank;

[0007] The adjusting device includes a conveying device movably connected to the bottom end of the nitrogen tank and a clamping device movably connected to the outside of the nitrogen tank. The conveying device is used for moving the nitrogen tank in and out, and the clamping device is used for movably clamping and limiting the nitrogen tank. A connecting block is fixed on the clamping device, and a contact switch is fixed on the inner wall of the fire cabinet at a position corresponding to the connecting block. The connecting block and the contact switch are movably in contact with each other, and the contact switch and the conveying device are electrically connected.

[0008] Preferably, an elastic member is fixed to one side of the contact switch close to the connecting block, and the elastic member and the contact switch are in movably contact with each other.

[0009] Preferably, the conveying device comprises a support plate slidably connected to the bottom end of the interior of the fire cabinet, the nitrogen tank is movably arranged on the support plate, and a power unit is fixed to the back of the support plate, and the power unit is used to push the support plate to move forward and backward;

[0010] Two cylindrical barrels are movably provided at the top of the support plate, and the two cylindrical barrels are fixedly connected by a fixing piece, and two nitrogen tanks are respectively sleeved inside the cylindrical barrels. A pushing part is connected between the fixing piece and the support plate, and the pushing part is used to push the fixing piece to flip;

[0011] The support plate is symmetrically fixed with support fans on the outsides of the two cylindrical barrels, and the support fans are rotatably connected to the lower ends of the cylindrical barrels on the same side.

[0012] Preferably, the clamping device includes two groups of fixing clips, each group of fixing clips includes two symmetrically arranged fixing clips, and the two fixing clips in each group are clamped and fixed to the nitrogen tank. A lead screw is rotatably connected inside the fire cabinet, and a group of threaded rings with opposite thread directions are provided at both ends of the lead screw. The two groups of fixing clips are respectively threadedly connected at both ends of the lead screw, and a driving member is fixed to one end of the lead screw.

[0013] Preferably, a limit rod is fixed inside the fire cabinet, the two sets of fixing clips and the limit rod are slidably connected, and the two sets of fixing clips and the limit rod are sleeve-connected.

[0014] Preferably, a slide groove is provided at the bottom end of the interior of the fire extinguisher cabinet, and the support plate is slidably connected inside the slide groove. Limiting grooves are provided on both sides of the inner wall of the slide groove, and the front opening of the limiting groove is set. Limiting plates that are adapted to the limiting grooves are fixed on both sides of the support plate, and the limiting plates are slidably connected inside the limiting grooves.

[0015] Preferably, the detection device comprises fire detectors, which are arranged in two rows and are all fixed on the top of the oil-immersed transformer body.

[0016] Preferably, it also includes an oil storage pillow, which is fixed on the oil-immersed transformer body. The bottom end of the oil storage pillow is connected to an oil outlet pipe, which is connected to the oil-immersed transformer body and has a shut-off valve.

[0017] Preferably, the oil drainage system includes an oil drainage pipe fixed inside the fire cabinet, the top end of the oil drainage pipe passes through the fire cabinet and extends to the outside, and is fixed with an oil drainage path, and the other end of the oil drainage path is connected to the upper part of the oil-immersed transformer body;

[0018] An oil drain valve is installed on the oil drain pipe, an oil leakage alarm is installed on the oil drain pipe below the oil drain valve, and a repair valve is installed on the oil drain pipe above the oil drain valve.

[0019] Preferably, the nitrogen injection system includes solenoid valves fixedly installed on two nitrogen tanks, the nitrogen tanks are connected to the high-pressure outlet pipe through pipelines, the high-pressure outlet pipe is equipped with a pressure reducing valve and a pressure gauge, the other end of the high-pressure outlet pipe is connected to the nitrogen exhaust pipe through the nitrogen release valve, the flow regulating valve and the mechanical interlock valve in sequence, the mechanical interlock valve is connected to the oil drain valve through a mechanical interlock rod, the other end of the nitrogen exhaust pipe is located outside the fire cabinet and is connected to the nitrogen injection pipe, the inner side of the nitrogen injection pipe is connected to a plurality of access pipes, and the ends of the access pipes are connected to the inner bottom end of the oil-immersed transformer body.

[0020] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0021] By adopting the design of the nitrogen tank, the regulating device, the conveying device, the clamping device and the contact switch, when the nitrogen tank needs to be replaced, the conveying device can be used to loosen the clamping of the nitrogen tank. The operation is simple and the time is short. Then, the clamping device and the contact switch can be used to push the nitrogen tank outward while turning it over. The nitrogen tank can be easily removed, thereby improving the stability of the nitrogen tank when it is turned over and reducing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the fire safety device for oil-immersed transformers of the utility model;

[0023] Figure 2 A schematic diagram of the internal structure of a fire-fighting cabinet of a fire-fighting safety device for an oil-immersed transformer of the utility model;

[0024] Figure 3 It is a partial cross-sectional structural diagram of the fire safety device for oil-immersed transformer of the utility model;

[0025] Figure 4 It is a schematic diagram of the back structure of the adjustment device of the fire safety equipment for oil-immersed transformers of the utility model;

[0026] Figure 5 It is a front structural schematic diagram of the regulating device of the fire safety equipment for oil-immersed transformer of the utility model;

[0027] Figure 6The structure of the clamping device of the fire safety equipment for oil-immersed transformers of the utility model is shown in FIG. Figure 1 ;

[0028] Figure 7 The structure of the clamping device of the fire safety equipment for oil-immersed transformers of the utility model is shown in FIG. Figure 2 ;

[0029] Figure 8 The structure diagram of the conveying device of the utility model for the fire safety equipment of the oil-immersed transformer Figure 1 ;

[0030] Fig. 9 The structure diagram of the conveying device of the utility model for the fire safety equipment of the oil-immersed transformer Figure 2 .

[0031] In the figure: 100, control cabinet; 200, detection device; 300, oil-immersed transformer body; 400, fire cabinet; 500, oil discharge system; 510, oil discharge pipe; 520, oil discharge circuit; 530, oil discharge valve; 600, nitrogen injection system; 610, solenoid valve; 620, high-pressure air outlet pipe; 630, nitrogen discharge pipe; 700, nitrogen tank; 800, regulating device; 810, conveying device; 811, support plate; 812, power unit; 813, cylindrical tube; 814, fixing part; 815, pushing part; 816, supporting fan; 820, clamping device; 821, fixing clip; 822, lead screw; 823, driving member; 824, limit rod; 830, contact switch; 900, oil storage pillow; 910, shut-off valve. DETAILED DESCRIPTION

[0032] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0033] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific implementation methods and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] like Figures 1 to 9 As shown, the present application provides a fire safety device for an oil-immersed transformer, including a control cabinet 100, a detection device 200, an oil-immersed transformer body 300, a fire cabinet 400, an oil drainage system 500 and a nitrogen injection system 600, wherein the fire cabinet 400 is fixed on one side of the oil-immersed transformer body 300, and the control cabinet 100 is installed in the main control room. The control cabinet 100 mainly includes components such as signal receiving and execution relays, working state selection knobs, signal indicator lights, etc., providing working state signal indication, alarm signal output and startup control, the detection device 200 is fixed on the oil-immersed transformer body 300, the fire cabinet 400 is connected to the upper end of the oil-immersed transformer body 300 through the oil drainage system 500, and the fire cabinet 400 is connected to the bottom end of the oil-immersed transformer body 300 through the nitrogen injection system 600, and there are two nitrogen tanks 700 inside the fire cabinet 400, and the two nitrogen tanks 700 are arranged in parallel, and the nitrogen tanks 700 are movably connected with an adjustment device 800;

[0036] The adjusting device 800 includes a conveying device 810 movably connected to the bottom end of the nitrogen tank 700 and a clamping device 820 movably connected to the outside of the nitrogen tank 700. The conveying device 810 is used for moving the nitrogen tank 700 in and out, and the clamping device 820 is used for movably clamping and limiting the nitrogen tank 700. A connecting block is fixed on the clamping device 820, and a contact switch 830 is fixed on the inner wall of the fire cabinet 400 at a position corresponding to the connecting block. The connecting block and the contact switch 830 are movably in contact with each other, and the contact switch 830 and the conveying device 810 are electrically connected.

[0037] To be further described in detail: by adopting the design of the nitrogen tank 700, the adjusting device 800, the conveying device 810, the clamping device 820 and the contact switch 830, when the nitrogen tank 700 needs to be replaced, the conveying device 810 can be used to loosen the clamping of the nitrogen tank 700. The operation is simple and time-saving. Then, the clamping device 820 and the contact switch 830 can be used to push the nitrogen tank 700 outward while flipping the nitrogen tank 700. By facilitating removal, the stability of the nitrogen tank 700 when flipping is improved, and damage is reduced.

[0038] Specifically, an elastic member is fixed to one side of the contact switch 830 close to the connection block, and the elastic member and the contact switch 830 are movably in contact with each other.

[0039] To further explain in detail: the elastic member is designed to protect the outer surface of the contact switch 830 from being damaged by excessive squeezing of the connecting block.

[0040] Specifically, the conveying device 810 includes a support plate 811 slidably connected to the bottom end of the fire cabinet 400, the nitrogen tank 700 is movably arranged on the support plate 811, and a power unit 812 is fixed to the back of the support plate 811, and the power unit 812 is used to push the support plate 811 to move forward and backward;

[0041] To be further described in detail: the power unit 812 adopts an electric telescopic rod, which is fixed inside the fire cabinet 400. The free end of the electric telescopic rod is fixedly connected to the back of the support plate 811, and the contact switch 830 is electrically connected to the power unit 812. After the connecting block contacts the elastic part on the contact switch 830, the contact switch 830 is squeezed and transmits a signal to the power unit 812, and the power unit 812 is actuated.

[0042] Two cylindrical barrels 813 are movably provided at the top of the support plate 811, and the two cylindrical barrels 813 are fixedly connected by a fixing member 814. Two nitrogen tanks 700 are respectively sleeved inside the cylindrical barrels 813. A pushing part 815 is connected between the fixing member 814 and the support plate 811, and the pushing part 815 is used to push the fixing member 814 to flip;

[0043] To be further described in detail: the contact switch 830 and the pushing part 815 are electrically connected. When the contact switch 830 is squeezed, a signal is transmitted to the pushing part 815, and the pushing part 815 moves synchronously. The pushing part 815 adopts an electric telescopic rod, which is movably connected to the support plate 811, and the free end of the electric telescopic rod is movably connected to the fixing part 814. The fixing part 814 can be turned over by the electric telescopic rod, thereby driving the disassembled nitrogen tank 700 to turn over through the cylindrical tube 813, thereby facilitating the removal of the nitrogen tank 700 from the fire cabinet 400. The cylindrical tube 813 plays a role in synchronously driving the turning of the nitrogen tank 700, and has a certain stability.

[0044] Support fans 816 are symmetrically fixed on the support plate 811 at the outer sides of the two cylindrical tubes 813 , and the support fans 816 are rotatably connected to the lower ends of the cylindrical tubes 813 on the same side.

[0045] Specifically, the clamping device 820 includes two groups of fixing clips 821, each group of fixing clips 821 includes two symmetrically arranged fixing clips 821, and the two fixing clips 821 in each group clamp and fix the nitrogen tank 700. The fire cabinet 400 is internally rotatably connected with a screw 822, and both ends of the screw 822 are provided with a group of threaded rings with opposite thread directions. The two groups of fixing clips 821 are respectively threadedly connected at both ends of the screw 822, and a driving member 823 is fixed to one end of the screw 822.

[0046] To further explain in detail: the driving member 823 is a motor, which is fixed to the inner wall of the fire cabinet 400, and the output shaft of the motor is fixedly connected to one end of the lead screw 822.

[0047] Specifically, a limiting rod 824 is fixed inside the fire cabinet 400, two sets of fixing clips 821 and the limiting rod 824 are slidably connected, and two sets of fixing clips 821 and the limiting rod 824 are sleeve-connected.

[0048] Further specific explanation: The design of the limit rod 824 is to limit the fixing clamp 821 to prevent the fixing clamp 821 from rotating circumferentially along with the lead screw 822 under the drive of the lead screw 822. With the limit rod 824, the fixing clamp 821 can move left and right axially along with the lead screw 822; an L-shaped plate is fixed inside the fire cabinet 400 to support the lead screw 822 and the limit rod 824, wherein the lead screw 822 and the L-shaped plate are rotatably connected, and one end of the limit rod 824 is fixed to the L-shaped plate.

[0049] Specifically, a slide groove is opened at the bottom end of the fire cabinet 400, and the support plate 811 is slidably connected inside the slide groove. Limiting grooves are opened on both sides of the inner wall of the slide groove, and the front opening of the limiting groove is set. Limiting plates that are adapted to the limiting grooves are fixed on both sides of the support plate 811, and the limiting plates are slidably connected inside the limiting grooves.

[0050] Further specific explanation: The design of the limit groove and the limit plate is to enable the support plate 811 to move forward and backward stably to facilitate the removal of the nitrogen tank 700. The limit bars are symmetrically fixed inside the slide groove, the limit bars and the support plate 811 are slidably connected, and the limit bars and the support plate 811 are sleeve-connected, and the movement stability of the support plate 811 is further increased by the limit bars.

[0051] Specifically, the detection device 200 includes fire detectors, which are arranged in two rows and are all fixed on the top of the oil-immersed transformer body 300 .

[0052] To further specify: the fire detector adopts glass ball type fire detector, and two rows of fire detectors are arranged crosswise. When the temperature sensing element of the fire detector detects that the temperature exceeds the rated value, the contact signal will send a fire signal to the control cabinet 100. After receiving the signal, the control cabinet 100 controls the start of the oil drainage system 500 and the nitrogen injection system 600, thereby realizing oil drainage and nitrogen injection fire prevention and fire extinguishing.

[0053] Specifically, it also includes an oil storage pillow 900, which is fixed on the oil-immersed transformer body 300. The bottom end of the oil storage pillow 900 is connected to an oil outlet pipe, which is connected to the oil-immersed transformer body 300. A shut-off valve 910 is provided on the oil outlet pipe.

[0054] To further specify: the shut-off valve 910 operates when the set flow rate is reached, automatically cutting off the oil supply path from the oil storage pillow 900 to the oil-immersed transformer body 300, thus preventing the high-position oil storage pillow 900 from "adding fuel to the fire".

[0055] Specifically, the oil drainage system 500 includes an oil drainage pipe 510 fixed inside the fire cabinet 400, the top end of the oil drainage pipe 510 passes through the fire cabinet 400 and extends to the outside, and is fixed with an oil drainage passage 520, and the other end of the oil drainage passage 520 is connected to the upper part of the oil-immersed transformer body 300;

[0056] To further explain in detail, the oil in the upper part of the oil-immersed transformer body 300 flows to the oil drain pipe 510 through the oil drain path 520, and then flows to the accident oil pool through the oil drain pipe 510.

[0057] An oil drain valve 530 is installed on the oil drain pipe 510 , an oil leakage alarm is installed on the oil drain pipe 510 below the oil drain valve 530 , and a repair valve is installed on the oil drain pipe 510 above the oil drain valve 530 .

[0058] To further explain in detail: after the oil drain valve 530 is opened, the oil in the oil drain pipe 510 flows into the accident oil pool.

[0059] Specifically, the nitrogen injection system 600 includes a solenoid valve 610 fixedly installed on two nitrogen tanks 700. The nitrogen tanks 700 are connected to a high-pressure outlet pipe 620 through a pipeline. The high-pressure outlet pipe 620 is equipped with a pressure reducing valve and a pressure gauge. The other end of the high-pressure outlet pipe 620 is connected to a nitrogen exhaust pipe 630 through a nitrogen release valve, a flow regulating valve and a mechanical interlock valve in sequence. The mechanical interlock valve is connected to an oil exhaust valve 530 through a mechanical interlock rod. The other end of the nitrogen exhaust pipe 630 is located outside the fire cabinet 400 and is connected to a nitrogen injection pipe. The inner side of the nitrogen injection pipe is connected to a plurality of access pipes, and the ends of the access pipes are connected to the inner bottom end of the oil-immersed transformer body 300.

[0060] Further specific description: After the oil drain delay, the nitrogen in the nitrogen tank 700 is injected into the bottom of the oil-immersed transformer body 300 through the nitrogen injection system 600. A large amount of reduced pressure cooling nitrogen fully stirs the oil in the oil-immersed transformer body 300, forcibly cools the fault point and the oil temperature, and forms a nitrogen protective layer to isolate the entry of air. The transformer oil cannot burn, achieving the purpose of fire prevention and fire extinguishing. Then, nitrogen is continuously injected for more than 30 minutes. A large amount of reduced pressure cooling nitrogen fully stirs the transformer oil in the box, cools the temperature of the transformer fault point, and when the oil temperature drops below the ignition point and flash point, the fire is completely extinguished and re-ignition is prevented.

[0061] In actual use of the fire safety device for oil-immersed transformers according to the embodiment of the present application, when the fire extinguishing conditions are met, the temperature sensing element of the fire detector detects that the temperature exceeds the rated value, and the contact signal will send a fire signal to the control cabinet 100. After receiving the signal, the control cabinet 100 controls the oil drainage system 500 and the nitrogen injection system 600 to start, thereby achieving oil drainage and nitrogen injection fire extinguishing;

[0062] When the nitrogen tank 700 needs to be replaced, the motor of the driving member 823 is started, and the motor drives the lead screw 822 to rotate, and the lead screw 822 drives the two groups of fixing clamps 821 to move, and the two in each group of fixing clamps 821 move back to each other, and the fixing clamps 821 release the clamping of the nitrogen tank 700. When the leftmost fixing clamp 821 moves to the left, the connecting block touches the elastic member, and the elastic member squeezes the contact switch 830. The contact switch 830 transmits a signal to the power unit 812 and the pushing unit 815. The free end of the electric telescopic rod of the power unit 812 drives the support plate 811 to move outward, and synchronously drives the nitrogen tank 700 to move outward. At the same time, the electric telescopic free end of the pushing unit 815 extends, pushing the fixing member 814, and the fixing member 814 synchronously drives the cylindrical tube 813 to flip, flip the nitrogen tank 700, and facilitate the removal of the nitrogen tank 700.

[0063] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fire safety device for an oil-immersed transformer, comprising a control cabinet (100), a detection device (200), an oil-immersed transformer body (300), a fire cabinet (400), an oil drainage system (500) and a nitrogen injection system (600), wherein the fire cabinet (400) is connected to the upper end of the oil-immersed transformer body (300) through the oil drainage system (500), and the fire cabinet (400) is connected to the lower end of the oil-immersed transformer body (300) through the nitrogen injection system (600), characterized in that: There are two nitrogen tanks (700) inside the fire cabinet (400), the two nitrogen tanks (700) are arranged in parallel, and an adjustment device (800) is movably connected to the nitrogen tanks (700); The regulating device (800) comprises a conveying device (810) movably connected to the bottom end of the nitrogen tank (700) and a clamping device (820) movably connected to the outside of the nitrogen tank (700); the conveying device (810) is used for moving the nitrogen tank (700) in and out; the clamping device (820) is used for movably clamping and limiting the nitrogen tank (700); a connecting block is fixed on the clamping device (820); a contact switch (830) is fixed on the inner wall of the fire cabinet (400) at a position corresponding to the connecting block; the connecting block and the contact switch (830) are movably in contact with each other; and the contact switch (830) and the conveying device (810) are electrically connected.

2. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: An elastic member is fixed to one side of the contact switch (830) close to the connection block, and the elastic member and the contact switch (830) are in active contact with each other.

3. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: The conveying device (810) comprises a support plate (811) slidably connected to the bottom end of the fire cabinet (400), the nitrogen tank (700) is movably arranged on the support plate (811), and a power unit (812) is fixed to the back of the support plate (811), and the power unit (812) is used to push the support plate (811) to move forward and backward; Two cylindrical barrels (813) are movably provided at the top of the support plate (811), the two cylindrical barrels (813) are fixedly connected via a fixing member (814), two nitrogen tanks (700) are respectively sleeved inside the cylindrical barrels (813), a pushing portion (815) is connected between the fixing member (814) and the support plate (811), and the pushing portion (815) is used to push the fixing member (814) to flip; Support fans (816) are symmetrically fixed on the support plate (811) at the outer sides of the two cylindrical tubes (813), and the support fans (816) are rotatably connected to the lower ends of the cylindrical tubes (813) on the same side.

4. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: The clamping device (820) includes two groups of fixing clips (821), each group of fixing clips (821) includes two symmetrically arranged fixing clips (821), and the two fixing clips (821) in each group are clamped and fixed to the nitrogen tank (700). A lead screw (822) is rotatably connected inside the fire cabinet (400), and a group of threaded rings with opposite thread directions are provided at both ends of the lead screw (822). The two groups of fixing clips (821) are respectively threadedly connected at both ends of the lead screw (822), and a driving member (823) is fixed to one end of the lead screw (822).

5. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: A limiting rod (824) is fixed inside the fire cabinet (400), the two sets of fixing clips (821) and the limiting rod (824) are both slidably connected, and the two sets of fixing clips (821) and the limiting rod (824) are both sleeve-connected.

6. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: A slide groove is provided at the bottom of the interior of the fire cabinet (400), and the support plate (811) is slidably connected inside the slide groove. Limiting grooves are provided on both sides of the inner wall of the slide groove, and the front of the limiting groove is opened. Limiting plates adapted to the limiting grooves are fixed on both sides of the support plate (811), and the limiting plates are slidably connected inside the limiting grooves.

7. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: The detection device (200) comprises fire detectors, which are arranged in two rows and are both fixed on the top of the oil-immersed transformer body (300).

8. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: It also includes an oil storage pillow (900), which is fixed on the oil-immersed transformer body (300). The bottom end of the oil storage pillow (900) is connected to an oil outlet pipe, which is connected to the oil-immersed transformer body (300). A shut-off valve (910) is provided on the oil outlet pipe.

9. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: The oil drainage system (500) comprises an oil drainage pipe (510) fixed inside the fire cabinet (400), the top end of the oil drainage pipe (510) passes through the fire cabinet (400) and extends to the outside, and is fixed with an oil drainage passage (520), and the other end of the oil drainage passage (520) is connected to the upper part of the inside of the oil-immersed transformer body (300); An oil drain valve (530) is installed on the oil drain pipe (510), an oil leakage alarm is installed on the oil drain pipe (510) below the oil drain valve (530), and a maintenance valve is installed on the oil drain pipe (510) above the oil drain valve (530).

10. The fire safety device for oil-immersed transformer according to claim 1, characterized in that: The nitrogen injection system (600) comprises a solenoid valve (610) fixedly mounted on two nitrogen tanks (700). The nitrogen tanks (700) are connected to a high-pressure gas outlet pipe (620) through a pipeline. The high-pressure gas outlet pipe (620) is equipped with a pressure reducing valve and a pressure gauge. The other end of the high-pressure gas outlet pipe (620) is connected to a nitrogen exhaust pipe (630) through a nitrogen release valve, a flow regulating valve and a mechanical interlocking valve in sequence. The mechanical interlocking valve is connected to an oil exhaust valve (530) through a mechanical interlocking rod. The other end of the nitrogen exhaust pipe (630) is located outside the fire cabinet (400) and is connected to a nitrogen injection pipe. The inner side of the nitrogen injection pipe is connected to a plurality of access pipes. The ends of the access pipes are connected to the inner bottom end of the oil-immersed transformer body (300).

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