Foam injection fire extinguishing device and method for power transformer

Abstract

This invention belongs to the field of fire safety technology, specifically relating to a foam spray fire extinguishing device and method for power transformers. The device includes: a detection unit for continuously monitoring environmental parameters surrounding the transformer; a control unit for alarm and composite judgment, fire confirmation and delay, controlling the opening and closing of the extinguishing agent supply unit, controlling the rotational spray of the rotary spray unit and the fixed-point spray of the fixed-point regulating spray unit; an extinguishing agent supply unit for dispensing the extinguishing agent; a rotary spray unit for rotating and spraying the extinguishing agent; and a fixed-point regulating spray unit for spraying the extinguishing agent at a fixed point. This invention is specifically designed for outdoor oil-immersed transformers in factory areas, enabling rapid and effective fire extinguishing in the event of a fire, preventing the risk of electric shock, and effectively protecting the safety of property and personnel in the factory area.

Description

Technical Field

[0001] This invention belongs to the field of fire safety technology, specifically relating to a foam spray fire extinguishing device and method for power transformers. Background Technology

[0002] Currently, the oil-immersed transformers in the factory area are located in an open outdoor area, posing risks of insulating oil fires and electrical fires. The transformer area currently uses a water mist fire suppression system. However, in the event of a transformer fire, the insulating oil leaks and floats on the water surface, potentially continuing to burn, which the water mist cannot effectively extinguish. Furthermore, since transformers are mostly installed in open outdoor locations, the water mist system does not provide adequate suffocation protection, and there is also a risk of electric shock when water overflows.

[0003] Therefore, there is an urgent need to develop a fire extinguishing system that can quickly and effectively extinguish liquid fires and electrical fires, based on the characteristics of transformer fires. Summary of the Invention

[0004] The purpose of this invention is to provide a foam spray fire extinguishing device and method for power transformers. This device is designed for outdoor oil-immersed transformers in factory areas. In the event of a fire, it can quickly and effectively extinguish the fire and prevent the risk of electric shock, thus effectively protecting the safety of property and personnel in the factory area.

[0005] Technical solution to achieve the purpose of this invention: A foam spray fire extinguishing device for power transformers, the device comprising: The detection unit is used to continuously monitor the surrounding environmental parameters of the transformer; The control unit is used for alarm and composite judgment, fire confirmation and delay, controlling the opening and closing of the extinguishing agent supply unit, and controlling the rotation of the rotary spray unit and the fixed-point spray of the fixed-point regulating spray unit. Extinguishing agent supply unit, used to output extinguishing agent; Rotary spray unit, used for rotating and spraying extinguishing agent; The fixed-point adjustable spray unit is used for spraying extinguishing agent at a fixed point.

[0006] Furthermore, the detection unit includes a flame detector, a temperature detector, and a gas detector deployed around the transformer.

[0007] Furthermore, the control unit includes a control box and a main control box. The control box is signal-connected to the detection unit and the main control box. The control box is used to receive the alarm signal from the detection unit, process the alarm signal to generate the sensing signal of the detection unit, and send the sensing signal of the detection unit to the main control box. The main control box is used to receive the sensing signal of the detection unit and perform logical composite judgment to confirm the fire status. After confirming the fire status, it outputs a trigger signal with an interruptible delay stage and triggers the fire extinguishing agent supply unit according to the trigger signal.

[0008] Furthermore, the control box is equipped with an audible and visual alarm, which is activated and emits a local alarm signal when any one of the flame detector, heat detector, and gas detector emits an alarm signal, and then uploads the local alarm signal to the main control box. After confirming the fire status, the main control box also generates a fire confirmation signal and sends the fire confirmation signal to the control box. After receiving the fire confirmation signal, the local alarm signal of the audible and visual alarm switches to a more urgent mode.

[0009] Furthermore, the extinguishing agent supply unit includes an ammonia tank for storing the driving medium and a foam storage tank for storing foam extinguishing agent. The ammonia tank is connected to the foam storage tank through a delivery pipe equipped with a pressure stabilizing valve. The foam storage tank outputs the extinguishing agent through a foam pipeline equipped with a sub-control valve. The pressure stabilizing valve and the sub-control valve are respectively connected to the main control box, and the main control box controls the opening and closing of the pressure stabilizing valve and the sub-control valve.

[0010] Furthermore, the rotating spray unit includes a support frame and a spraying mechanism. The support frame is arranged around the transformer. The spraying mechanism includes a branch pipe connected to the foam pipeline, a guide pipe connected to the branch pipe, a sleeve rotatably fitted on the guide pipe, a spraying pipe connected to the sleeve, and multiple foam nozzles on the spraying pipe. The support frame is provided with a drive assembly for driving the sleeve and spraying pipe to rotate around the transformer. The drive assembly includes a motor mounted on the support frame and a rotating disk driven by the motor and connected to the sleeve. A sealing ring is provided between the guide pipe and the sleeve. The motor is connected to the main control box, and the main control box drives the motor, thereby driving the sleeve and spraying pipe, along with the foam nozzles, to rotate around the transformer.

[0011] Furthermore, the fixed-point adjustable spray unit includes an adjustment mechanism and a movable nozzle disposed above the support frame. The adjustment mechanism includes a front-to-back adjuster and a left-to-right adjuster orthogonally disposed on a horizontal plane. The movable nozzle is mounted on the left-to-right adjuster. The front-to-back adjuster and the left-to-right adjuster drive the movable nozzle to perform two-dimensional positioning. The movable nozzle is connected to the foam pipeline through a connecting hose.

[0012] Furthermore, the adjustment mechanism also includes: a frame-type support and a lifting driver. The frame-type support is composed of two support plates and two fixed support plates connected together, and is horizontally arranged above the support frame. A front-to-back adjuster and a left-to-right adjuster are installed on the frame-type support. The lifting driver is connected between the support frame and the frame-type support, and is used to drive the frame-type support and the moving nozzle to perform vertical displacement. The front-to-back adjuster includes a first servo motor, a first lead screw driven by the first servo motor, and a first slider threaded with the first lead screw. The first lead screw is installed on one support plate, and a guide rod and a guide slider cooperating with the guide rod are installed on the other support plate. The left-to-right adjuster includes a moving support plate fixedly connected to the first slider and the guide slider, a second servo motor, a second lead screw driven by the second servo motor, and a second slider threaded with the second lead screw. The moving nozzle is installed on the second slider, and the second lead screw is installed on the moving support plate. The first servo motor and the second servo motor are respectively connected to the main control box, and the main control box drives the first servo motor and the second servo motor to position the moving nozzle.

[0013] Furthermore, the device also includes: The visual positioning unit is used to capture images of the fire source, and based on these images, the main control box controls the moving nozzle to aim at the fire source. The visual positioning unit includes a heightening support rod, a visual camera, and a servo motor. The heightening support rod is fixedly connected to the frame bracket of the adjustment mechanism. The servo motor is installed at the top of the heightening support rod and drives the visual camera to tilt. The servo motor is connected to the central control box, which drives the servo motor and in turn drives the visual camera to tilt. The visual camera is also connected to the central control box and is used to capture images of the fire source. The main control box controls the adjustment mechanism based on the fire source images to align the moving nozzle with the fire source.

[0014] A foam spraying fire extinguishing method specifically for power transformers, the method comprising: The transformer status is monitored synchronously using flame detectors, temperature detectors, and gas detectors; When the sensing signals from the flame detector, heat detector, and gas detector meet the preset composite fire logic, the fire status is confirmed, and a delay command that can be manually interrupted is initiated. Without interruption command, the extinguishing agent supply unit is activated after the delay ends, delivering the foam extinguishing agent to the rotary spray unit and the fixed-point regulating spray unit. The transformer is extinguished by rotating the spray from the rotating spray unit to cover the circumference of the transformer. At the same time, the visual positioning unit identifies the fire source and controls the fixed-point adjustment spray unit to move the moving nozzle above the fire source for fixed-point spraying.

[0015] The beneficial technical effects of this invention are as follows: 1. The device of this invention mainly consists of a storage tank, a high-efficiency foam mixer, pressure-resistant pipelines, and a dedicated spray terminal. Its core function is to rapidly and uniformly mix fire extinguishing foam liquid with water through mechanical automatic or remote activation, forming stable and highly covert fire extinguishing foam. The foam, through a specially designed spray device, covers a large area of ​​the transformer body and overflow oil surface, achieving rapid oxygen isolation and cooling, quickly suffocating the flames and preventing reignition. The device has a compact structure, is easy to install and maintain, and can effectively cope with the suddenness and high risk of transformer fires, ensuring the safety of power facilities.

[0016] 2. The device of this invention greatly reduces the false alarm rate and ensures the accuracy of fire identification by combining the detection of flame detector, heat detector and gas detector with logical judgment. At the same time, it uses a visual positioning unit to identify the fire source in real time and drives a two-dimensional adjustment mechanism to control the moving nozzle to spray precisely at the point of contact. This enables efficient fire suppression of the core fire source in the early stage of a fire, significantly improving the speed and targeting of fire suppression and effectively preventing the spread of fire.

[0017] 3. The device of this invention integrates two modes: circumferential rotating spray and top fixed-point adjustable spray. The rotating spray unit can uniformly cover the transformer body and its surroundings with foam in 360 degrees, achieving rapid oxygen isolation and cooling. The top movable nozzle can be flexibly adjusted to supplement the attack on high points of the flame or hidden fire sources. The two work together to form a three-dimensional fire extinguishing network of "circumferential surround + top precision", ensuring that there are no dead angles in fire extinguishing and effectively suppressing reignition.

[0018] 4. The device of this invention incorporates a manually adjustable delay step in the control process, providing a buffer time for manual confirmation and emergency response, thus preventing system malfunctions. In addition, the device supports modular expansion, with one supply unit capable of configuring multiple control and spray terminals to meet the independent or collaborative protection needs of multiple transformers. The entire system has a compact structure and a high degree of automation, reducing reliance on external rescue and significantly improving the autonomy and reliability of fire prevention and control of power facilities. Attached Figure Description

[0019] Figure 1 A schematic diagram of a foam jet fire extinguishing device for power transformers provided by the present invention; Figure 2 A schematic diagram of the rotating spray unit structure in a foam spray fire extinguishing device for power transformers provided by the present invention; Figure 3 A schematic diagram of the fixed-point adjustable spraying unit in a foam spraying fire extinguishing device for power transformers provided by the present invention; Figure 4 A schematic diagram of the adjusting mechanism in a foam jet fire extinguishing device for power transformers provided by the present invention; Figure 5 A schematic diagram of the visual positioning unit structure in a foam spray fire extinguishing device for power transformers provided by the present invention; Figure 6 A flowchart of a foam spray fire extinguishing method for power transformers provided by the present invention.

[0020] In the picture: 1-Ammonia tank; 11-Pressure stabilizing valve; 12-Transfer pipe; 2-Foam storage tank; 21-Divider control valve; 22-Foam piping; 3-Main control box; 31-Control box; 4-Support frame; 5-Spraying mechanism; 51-Diverter pipe; 52-Guide pipe; 53-Casing; 54-Spraying pipe; 541-Foam nozzle; 55-Motor; 551-Rotating disc; 6-Adjustment mechanism; 61-Moving nozzle; 62-Front-back adjuster; 63-Left-right adjuster; 621 - Support plate; 622 - First servo motor; 623 - First lead screw; 624 - First slider; 631 - Movable support plate; 632 - Second servo motor; 633 - Second lead screw; 634 - Second slider; 7-Visual positioning unit; 71-Heightening support rod; 72-Visual camera; 73-Servo motor. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] This invention provides a foam spray fire extinguishing device specifically for power transformers, comprising: The detection unit is used to continuously monitor the surrounding environmental parameters of the transformer; The control unit is used for alarm and composite judgment, fire confirmation and delay, controlling the opening and closing of the extinguishing agent supply unit, and controlling the rotation of the rotary spray unit and the fixed-point spray of the fixed-point regulating spray unit. Extinguishing agent supply unit, used to output extinguishing agent; Rotary spray unit, used for rotating and spraying extinguishing agent; The fixed-point adjustable spray unit is used for spraying extinguishing agent at a fixed point.

[0023] The detection unit includes flame detectors, heat detectors, and gas detectors deployed around the transformer.

[0024] In one specific embodiment, three flame detectors, three heat detectors, and two gas detectors are evenly deployed on the support around and above the target transformer to form a three-dimensional monitoring network.

[0025] The control unit includes a control box 31 and a main control box 3. The control box 31 is connected to the detection unit and the main control box 3 by signal. The control box 31 is used to receive the alarm signal from the detection unit, process the alarm signal to generate the sensing signal of the detection unit, and send the sensing signal of the detection unit to the main control box 3. The main control box 3 is used to receive the sensing signal of the detection unit and perform logical composite judgment to confirm the fire status. After confirming the fire status, it outputs a trigger signal with an interruptible delay stage and triggers the fire extinguishing agent supply unit according to the trigger signal.

[0026] The control box 31 is equipped with an audible and visual alarm, which is used to activate the audible and visual alarm, issue a local alarm signal, and upload the local alarm signal to the main control box 3 when any one of the flame detector, heat detector, and gas detector issues an alarm signal.

[0027] After confirming the fire status, the main control box 3 generates a fire confirmation signal and sends it to the control box 31. After receiving the fire confirmation signal, the local alarm signal of the audible and visual alarm in the control box 31 changes to a more urgent mode.

[0028] In one specific embodiment, the control box 31 is made of waterproof and dustproof material. One control box 31 is installed on a column near the transformer for easy operation. It integrates a signal processing module and an audible and visual alarm. The signal processing module processes the alarm signals received from the detection units to generate sensing signals for the detection units. A main control box 3 is installed in the main control room and contains an embedded industrial PLC controller. The PLC controller runs a fire logic judgment program to perform logical composite judgments on the received sensing signals from the detection units to confirm the fire status and has a remote communication interface.

[0029] The extinguishing agent supply unit includes an ammonia tank 1 for storing the driving medium and a foam storage tank 2 for storing foam extinguishing agent. The ammonia tank 1 is connected to the foam storage tank 2 through a delivery pipe 12 equipped with a pressure stabilizing valve 11. The foam storage tank 2 outputs the extinguishing agent through a foam pipeline 22 equipped with a sub-control valve 21. The pressure stabilizing valve 11 and the sub-control valve 21 are respectively connected to the main control box 3, and the main control box 3 controls the opening and closing of the pressure stabilizing valve 11 and the sub-control valve 21.

[0030] In one specific embodiment, an ammonia tank 1 and a foam storage tank 2 are fixed side by side on a dedicated base at the edge of the site. The outlet of the ammonia tank 1 is connected to the air inlet at the top of the foam storage tank 2 via a high-pressure delivery pipe 12, and a pressure regulating valve 11 is installed on the high-pressure delivery pipe 12. The bottom outlet of the foam storage tank 2 is connected to a foam pipeline 22, and a control valve 21 is installed on the pipeline near the tank body.

[0031] The rotary spraying unit includes a support frame 4 and a spraying mechanism 5. The support frame 4 is arranged around the transformer. The spraying mechanism 5 includes a branch pipe 51 connected to the foam pipeline 22, a guide pipe 52 connected to the branch pipe 51, a sleeve 53 rotatably fitted on the guide pipe 52, a spraying pipe 54 connected to the sleeve 53, and a plurality of foam nozzles 541 provided on the spraying pipe 54. The support frame 4 is provided with a drive assembly that drives the sleeve 53 and the spraying pipe 54 to rotate around the transformer.

[0032] The drive assembly includes a motor 55 mounted on a support frame 4 and a rotating disk 551 driven by the motor 55 and connected to the sleeve 53. A sealing ring is provided between the guide pipe 52 and the sleeve 53. The motor 55 is connected to the main control box 3, and the main control box 3 drives the motor 55, which in turn drives the sleeve 53 and the spray pipe 54 together with the foam nozzle 541 to rotate around the transformer.

[0033] In one specific embodiment, a ring-shaped support frame 4 is fixed to the ground by anchor bolts, enclosing the transformer in the center. For example... Figure 2 As shown, a diversion pipe 51 is fixed inside the support frame 4. The diversion pipe 51 is connected to the main pipe from the foam pipe 22 via a tee connector. A guide pipe 52 extends upward from the diversion pipe 51. A freely rotatable sleeve 53 is fitted onto the upper end of the guide pipe 52 via a bearing and a sealing ring. Spray pipes 54 are welded to both the upper and lower ends of the sleeve 53. The inner side of the spray pipe 54 has evenly spaced holes and is equipped with two wide-angle foam nozzles 541, all facing the center of the transformer. A motor 55 is installed in the middle of the support frame 4. The output shaft of the motor 55 is connected to a rotating disk 551 via a coupling. The rotating disk 551 is securely connected to the sleeve 53.

[0034] The fixed-point adjustable spray unit includes an adjustment mechanism 6 and a movable nozzle 61 disposed above the support frame 4. The adjustment mechanism 6 includes a front-to-back adjuster 62 and a left-to-right adjuster 63 orthogonally arranged on the horizontal plane. The movable nozzle 61 is mounted on the left-to-right adjuster 63. The movable nozzle 61 is driven to perform two-dimensional positioning by the front-to-back adjuster 62 and the left-to-right adjuster 63. The movable nozzle 61 is connected to the foam pipeline 22 through a connecting hose 611. The adjustment mechanism 6 also includes: a frame bracket and a lifting driver. The frame bracket is composed of two support plates 621 and two fixed support plates 64 connected together and is horizontally set above the support frame 4. The front and rear adjusters 62 and the left and right adjusters 63 are installed on the frame bracket. The lifting driver is connected between the support frame 4 and the frame bracket and is used to drive the frame bracket and the moving nozzle 61 to make vertical displacement.

[0035] The front and rear adjuster 62 includes a first servo motor 622, a first lead screw 623 driven by the first servo motor 622, and a first slider 624 threadedly engaged with the first lead screw 623; the first lead screw 623 is mounted on a support plate 621, and a guide rod and a guide slider cooperating with the guide rod are mounted on another support plate 621.

[0036] The left and right adjuster 63 includes a movable support plate 631 fixedly connected to the first slider 624 and the guide slider, a second servo motor 632, a second lead screw 633 driven by the second servo motor 632, and a second slider 634 threadedly engaged with the second lead screw 633. The movable nozzle 61 is mounted on the second slider 634, and the second lead screw 633 is mounted on the movable support plate 631.

[0037] The first servo motor 622 and the second servo motor 632 are connected to the main control box 3 respectively. The main control box 3 drives the first servo motor 622 and the second servo motor 632 to position the moving nozzle 61.

[0038] In one specific implementation, such as Figure 3-4 As shown, approximately 1.5 meters above the support frame 4, a rectangular frame-type support, welded together from two support plates 621 and two fixed support plates 64, is suspended by four cylinders 41. This support constitutes a horizontal XY moving platform.

[0039] Front and rear adjuster 62: One of the two support plates 621 is equipped with a linear module consisting of a first servo motor 622, a first lead screw 623 and a first slider 624, while the other support plate 621 is equipped with a guide rod and a guide slider. The slider and the first slider 624 together fix a long strip of movable support plate 631.

[0040] Left and right adjuster 63: A linear module consisting of a second servo motor 632, a second lead screw 633, and a second slider 634 is mounted on the movable support plate 631. A movable nozzle 61 is mounted below the second slider 634 via a universal joint. The movable nozzle 61 is connected to another branch of the foam pipe 22 via a high-pressure resistant rubber connecting hose 611.

[0041] The device of the present invention further includes: a visual positioning unit for capturing fire source images and controlling the moving nozzle 61 to align with the fire source via the main control box 3 based on the fire source images; The visual positioning unit includes a visual camera 72, which is mounted above the adjustment mechanism 6 and connected to the central control box 3. The visual camera 72 is used to capture images of the fire source. The main control box 3 controls the adjustment mechanism 6 based on the fire source images so that the moving nozzle 61 is aligned with the fire source.

[0042] In one specific embodiment, the visual camera 72 uploads the captured fire source image to the central control box 3. The central control box 3 analyzes the fire source image through its image processing algorithm, quickly locates the coordinates of the open flame or the fire source with the highest temperature, converts the coordinates into control commands, and drives the first servo motor 622 and the second servo motor 632 according to the control commands to position the moving nozzle 61 directly above the fire source.

[0043] The visual positioning unit also includes a heightening support rod 71 and a servo motor 73. The heightening support rod 71 is fixedly connected to the frame bracket of the adjustment mechanism 6. The servo motor 73 is mounted on the top of the heightening support rod 71 and drives the visual camera 72 to tilt. The servo motor 73 is connected to the central control box 3, and the central control box 3 drives the servo motor 73, which in turn drives the visual camera 72 to tilt.

[0044] In one specific implementation, such as Figure 5 As shown, a heightening support rod 71 is vertically fixedly connected to each opposite position of the rectangular frame bracket of the adjustment mechanism 6. A servo motor 73 with a gimbal is installed at the top of the rod, and a high-definition infrared vision camera 72 is fixedly connected to the gimbal. The signal lines of the vision camera 72 and the servo motor 73 are connected to the main control box 3 in the main control room.

[0045] The control unit is configured to: activate the audible and visual alarm when a single detector alarm signal is received; and enter a 0-30 second delay phase when a fire signal confirmed by multiple detectors is received, and respond to a manual intervention signal during this phase to terminate the process, or automatically trigger the extinguishing agent supply unit after the delay without intervention.

[0046] In one specific embodiment, the device is configured to operate independently for two sets of transformers, including two control units and two separate control valves 21 connected to the foam storage tank 2, such as... Figure 1 As shown.

[0047] For scenarios requiring protection of two adjacent transformers, a shared extinguishing agent supply unit consisting of an ammonia tank 1 and a foam storage tank 2 can be used. In this case, the foam pipeline 22 branches into two independent branches after the tank outlet. Each branch is equipped with its own sub-control valve 21, which connects to an independent rotary spray unit and a fixed-point regulating spray unit surrounding each transformer. Simultaneously, two independent detection units, a control box 31, and a main control box 3 processing channel are configured. The two systems are logically completely independent, capable of being triggered and operated independently without interference, achieving resource efficiency and personalized protection.

[0048] This invention also provides a foam spraying fire extinguishing method specifically for power transformers, comprising: The transformer status is monitored synchronously using flame detectors, temperature detectors, and gas detectors; When the sensing signals from the flame detector, heat detector, and gas detector meet the preset composite fire logic, the fire status is confirmed, and a delay command that can be manually interrupted is initiated. Without interruption command, the extinguishing agent supply unit is activated after the delay ends, delivering the foam extinguishing agent to the rotary spray unit and the fixed-point regulating spray unit. The transformer is extinguished by rotating the spray from the rotating spray unit to cover the circumference of the transformer. At the same time, the visual positioning unit identifies the fire source and controls the fixed-point adjustment spray unit to move the moving nozzle 61 above the fire source for fixed-point spraying.

[0049] In one specific implementation, such as Figure 6 As shown, the specific method for extinguishing a fire in a power transformer using the device of the present invention is as follows: Step 1: Continuous monitoring: Flame detectors, heat detectors, and gas detectors continuously monitor the environmental parameters around the transformer 24 hours a day.

[0050] Step 2, Alarm and Composite Judgment: When any one of the flame detector, heat detector, or gas detector reaches the threshold and issues an alarm signal, the audible and visual alarm in control box 31 immediately activates, issuing a local alarm signal. Simultaneously, the local alarm signal is uploaded to the main control box 3. The logic program within the main control box 3 is triggered, and it begins analyzing whether any other type of detector sends a confirmation signal within the next 2 seconds.

[0051] Step 3, Fire Confirmation and Delay: If the program determines the fire status as "multi-detector composite confirmation", the main control box 3 sends a fire confirmation signal to the control box 31, and the audible and visual alarm switches to a more urgent mode. At the same time, the main control box 3 starts an adjustable delay counter of 0-30 seconds, and an intervention window pops up on the human-machine interface in the main control room.

[0052] Step 4: Manual intervention or automatic execution: Intervention Termination: If the on-duty personnel confirm that it is a false alarm through the monitoring screen within 15 seconds, they can click the "Cancel" button on the interface. The main control box 3 will terminate all subsequent fire extinguishing commands, reset the system, and retain only the alarm record.

[0053] Automatic execution: If there is no human intervention within 30 seconds, the system determines that a fire has actually occurred and automatically initiates the fire extinguishing procedure.

[0054] Step 5: Activate fire suppression: The main control box 3 first sends an opening command to the pressure stabilizing valve 11 of the ammonia tank 1 and the sub-control valve 21 of the foam storage tank 2.

[0055] Ammonia gas enters foam storage tank 2 through delivery pipe 12, compressing the foam extinguishing agent pre-stored in foam storage tank 2.

[0056] Under pressure, the foam extinguishing agent is divided into two paths through the foam pipeline 22: one path enters the diversion pipe 51 of the rotary spray unit; the other path goes through the connecting hose 611 to the movable nozzle 61 of the fixed-point adjustment spray unit.

[0057] Three-dimensional jet fire suppression: Circumferential Coverage: Motor 55 starts synchronously, driving bushing 53 and spray pipe 54 to rotate slowly via rotating disk 551. Foam is sprayed from rotating foam nozzle 541, forming a continuous and uniform foam covering layer on the transformer body, achieving oxygen isolation and overall cooling.

[0058] Targeted Strike: Simultaneously, the visual camera 72, driven by the servo motor 73, performs a panoramic scan. The image is analyzed by the image processing algorithm within the main control box 3, quickly locating the coordinates of the open flame or the hottest fire source. The controller converts these coordinates into control commands, driving the first servo motor 622 and the second servo motor 632 to precisely position the moving nozzle 61 directly above the fire source. The moving nozzle 61 then sprays continuously or in pulses at the fire source, achieving targeted firefighting.

[0059] Post-fire handling: After the main control box 3 has sprayed for the preset time or received a signal that the fire has been extinguished, it closes the pressure regulating valve 11 and the sub-control valve 21, stops the motor 55 and the servo motor, and the system enters standby mode to wait for reset and maintenance.

[0060] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A foam injection fire extinguishing apparatus for power transformers, characterized in that, The device includes: The detection unit is used to continuously monitor the surrounding environmental parameters of the transformer; The control unit is used for alarm and composite judgment, fire confirmation and delay, controlling the opening and closing of the extinguishing agent supply unit, and controlling the rotation of the rotary spray unit and the fixed-point spray of the fixed-point regulating spray unit. Extinguishing agent supply unit, used to output extinguishing agent; Rotary spray unit, used for rotating and spraying extinguishing agent; The fixed-point adjustable spray unit is used for spraying extinguishing agent at a fixed point.

2. A foam stream fire extinguishing apparatus for electrical transformers according to claim 1, characterised in that, The detection unit includes a flame detector, a temperature detector, and a gas detector deployed around the transformer.

3. A foam stream fire extinguishing apparatus for electrical transformers according to claim 2, characterised in that, The control unit includes a control box (31) and a main control box (3). The control box (31) is connected to the detection unit and the main control box (3). The control box (31) is used to receive the alarm signal from the detection unit, process the alarm signal to generate the sensing signal of the detection unit, and send the sensing signal of the detection unit to the main control box (3). The main control box (3) is used to receive the sensing signal of the detection unit and perform logical composite judgment to confirm the fire status. After confirming the fire status, it outputs a trigger signal with an interruptible delay stage and triggers the fire extinguishing agent supply unit according to the trigger signal.

4. A foam stream fire extinguishing apparatus for electrical transformers according to claim 3, characterised in that, The control box (31) is equipped with an audible and visual alarm, which is used to activate the audible and visual alarm and send a local alarm signal when any one of the flame detector, heat detector and gas detector sends an alarm signal, and upload the local alarm signal to the main control box (3); after confirming the fire status, the main control box (3) also generates a fire confirmation signal and sends the fire confirmation signal to the control box (31). After receiving the fire confirmation signal, the local alarm signal of the audible and visual alarm changes to a more urgent mode.

5. A foam stream fire extinguishing apparatus for electrical transformers according to claim 3, characterized in that, The fire extinguishing agent supply unit includes an ammonia tank (1) for storing the driving medium and a foam storage tank (2) for storing foam fire extinguishing agent. The ammonia tank (1) is connected to the foam storage tank (2) through a delivery pipe (12) equipped with a pressure stabilizing valve (11). The foam storage tank (2) outputs the fire extinguishing agent through a foam pipeline (22) equipped with a sub-control valve (21). The pressure stabilizing valve (11) and the sub-control valve (21) are respectively connected to the main control box (3). The main control box (3) controls the opening and closing of the pressure stabilizing valve (11) and the sub-control valve (21).

6. A foam stream fire extinguishing apparatus for electrical transformers according to claim 5, characterised in that, The rotary spraying unit includes a support frame (4) and a spraying mechanism (5). The support frame (4) is arranged around the transformer. The spraying mechanism (5) includes a branch pipe (51) connected to the foam pipeline (22), a guide pipe (52) connected to the branch pipe (51), a sleeve (53) rotatably fitted on the guide pipe (52), a spraying pipe (54) connected to the sleeve (53), and multiple foam nozzles (541) provided on the spraying pipe (54). The support frame (4) is provided with a drive sleeve (53). The drive assembly for rotating the spray pipe (54) around the transformer is provided with a motor (55) mounted on the support frame (4) and a rotating disk (551) driven by the motor (55) and connected to the bushing (53). A sealing ring is provided between the guide pipe (52) and the bushing (53). The motor (55) is connected to the main control box (3). The motor (55) is driven by the main control box (3), which in turn drives the bushing (53) and the spray pipe (54) together with the foam nozzle (541) to rotate around the transformer.

7. A foam stream fire extinguishing apparatus for electrical transformers according to claim 5, characterized in that, The fixed-point adjustable spray unit includes an adjustment mechanism (6) and a movable nozzle (61) disposed above the support frame (4). The adjustment mechanism (6) includes a front-to-back adjuster (62) and a left-to-right adjuster (63) orthogonally arranged on the horizontal plane. The movable nozzle (61) is mounted on the left-to-right adjuster (63). The movable nozzle (61) is driven to perform two-dimensional positioning by the front-to-back adjuster (62) and the left-to-right adjuster (63). The movable nozzle (61) is connected to the foam pipeline (22) through the connecting hose (611).

8. A foam spray fire extinguishing device for power transformers according to claim 7, characterized in that, The adjustment mechanism (6) further includes: a frame bracket and a lifting driver. The frame bracket is composed of two support plates (621) and two fixed support plates (64) connected together and is horizontally set above the support frame (4). The front and rear adjusters (62) and the left and right adjusters (63) are installed on the frame bracket. The lifting driver is connected between the support frame (4) and the frame bracket and is used to drive the frame bracket and the moving nozzle (61) to make vertical displacement. The front and rear adjusters (62) include a first servo motor (622), a first lead screw (623) driven by the first servo motor (622), and a first slider (624) threaded with the first lead screw (623). The first lead screw (623) is installed on one support plate (621) and the other support plate (624) is installed on the other support plate (621). The device is equipped with a guide rod and a guide slider that cooperates with the guide rod; the left and right adjuster (63) includes a movable support plate (631) fixedly connected to the first slider (624) and the guide slider, a second servo motor (632), a second lead screw (633) driven by the second servo motor (632), and a second slider (634) threadedly connected to the second lead screw (633). The movable nozzle (61) is installed on the second slider (634), and the second lead screw (633) is installed on the movable support plate (631). The first servo motor (622) and the second servo motor (632) are respectively connected to the main control box (3). The first servo motor (622) and the second servo motor (632) are driven by the main control box (3) to position the movable nozzle (61).

9. A foam spray fire extinguishing device for power transformers according to claim 7, characterized in that, The device further includes: A visual positioning unit is used to capture images of the fire source and, based on the fire source images, controls the moving nozzle (61) to align with the fire source via the main control box (3); The visual positioning unit includes a heightening support rod (71), a visual camera (72), and a servo motor (73). The heightening support rod (71) is fixedly connected to the frame bracket of the adjustment mechanism (6). The servo motor (73) is installed on the top of the heightening support rod (71) and drives the visual camera (72) to pitch. The servo motor (73) is connected to the central control box (3). The central control box (3) drives the servo motor (73), which in turn drives the visual camera (72) to pitch. The visual camera (72) is connected to the central control box (3). The visual camera (72) is used to capture images of the fire source. The main control box (3) controls the adjustment mechanism (6) based on the fire source images so that the moving nozzle (61) is aligned with the fire source.

10. A foam jet fire extinguishing method for power transformers, employing the foam jet fire extinguishing device for power transformers as described in any one of claims 1-9, characterized in that, The method includes: The transformer status is monitored synchronously using flame detectors, temperature detectors, and gas detectors; When the sensing signals from the flame detector, heat detector, and gas detector meet the preset composite fire logic, the fire status is confirmed, and a delay command that can be manually interrupted is initiated. Without interruption command, the extinguishing agent supply unit is activated after the delay ends, delivering the foam extinguishing agent to the rotary spray unit and the fixed-point regulating spray unit. The transformer is extinguished by rotating the spray from the rotating spray unit to cover the circumference of the transformer. At the same time, the fire source is identified by the visual positioning unit, and the fixed-point adjustment spray unit is controlled to move the moving nozzle (61) above the fire source for fixed-point spraying.

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