Nitrogen fire extinguishing system and process method for electromechanical equipment

Abstract

The invention relates to a nitrogen fire extinguishing system, in particular to a nitrogen fire extinguishing system for electromechanical equipment and a technological method. The technical problems that in the prior art, cost is high, later-stage maintenance workload is large, and meanwhile fire disasters are difficult to extinguish completely are mainly solved. The system comprises a moving trolley, a fire fighting device, a detection device, a control device and a nitrogen pipe network, the fire-fighting device comprises a descending unit, a fire-fighting ring and an isolation cover. The movable trolley is used for moving the fire fighting device, directional injection of nitrogen is achieved through cooperation of the descending unit and the fire fighting ring, the isolation space is formed through the isolation cover, and therefore accurate, rapid and low-loss fire extinguishing is achieved through the cooperative fire extinguishing mode of movable type directional injection and closed space isolation, and the fire fighting requirement of large-scale equipment in a large-area plant is met.

Description

Technical Field

[0001] This invention relates to nitrogen fire suppression systems, and more specifically to a nitrogen fire suppression system and process for electromechanical equipment. Background Technology

[0002] Mechanical and electrical equipment typically needs to be stored for a period of time after being filled with propellant. The propellant in the engine tank is flammable and explosive, so if the propellant leaks during storage, there is a risk of fire and explosion.

[0003] Existing fire suppression systems for mechanical and electrical equipment primarily employ water-based and dry powder extinguishing systems. Water-based systems are prone to short circuits and damage, while dry powder systems are difficult to clean and corrode equipment components. Conventional gas extinguishing systems are mostly fixed-point installations with limited coverage, making them unsuitable for multiple dispersed pieces of mechanical and electrical equipment within a factory. Gas extinguishing systems, on the other hand, are environmentally friendly, pollution-free, have long-lasting extinguishing power, and are less destructive. Currently, nitrogen extinguishing systems are used during commissioning of mechanical and electrical equipment. However, these systems only address the extinguishing needs of individual engines and do not meet the fire protection requirements of a large number of mechanical and electrical devices within a factory.

[0004] Mechanical and electrical equipment storage workshops are characterized by large areas and a large number of stored products. If a total flooding gas fire extinguishing method is used, there are drawbacks such as high cost and large amount of maintenance work in the later stage. At the same time, the storage capacity of extinguishing agent is limited. In addition, the workshop area is large and not a completely sealed space, which may result in the extinguishing agent being exhausted but still not effectively extinguishing the fire or suppressing the explosion.

[0005] Therefore, there is an urgent need for a fire protection system that is highly adaptable, has high fire extinguishing efficiency, and does not damage equipment. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problems of high cost, large amount of maintenance work, and difficulty in completely extinguishing fires when existing nitrogen fire extinguishing systems are used in mechanical and electrical equipment storage plants. The invention provides a nitrogen fire extinguishing system and process method for mechanical and electrical equipment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A nitrogen fire suppression system for electromechanical equipment, characterized by: Includes mobile carts, fire-fighting equipment, detection equipment, control equipment, nitrogen pipeline network, and running track; The running track is installed on the top of the target factory building and extends to the location of all mechanical and electrical equipment that need to be extinguished. The mobile trolley is movably installed on a running track and is used to move to a position of an electromechanical equipment in a target factory building which needs to be extinguished under the control of a control signal; the nitrogen pipe network is arranged on a wall and a top of the target factory building and is connected with an external nitrogen source; an electromagnetic valve is installed on the nitrogen pipe network and is opened and closed under the control of the control signal to control the on-off of the nitrogen pipe network; The fire extinguishing device comprises a descending unit, a fire extinguishing ring and an isolation cover. The fire extinguishing ring is provided with a plurality of spray holes for outputting nitrogen to achieve fire extinguishing. The fire extinguishing ring is installed on an output end of the descending unit, and the isolation cover is installed on the fire extinguishing ring, and the spray holes on the fire extinguishing ring are located within the isolation range of the isolation cover. The descending unit is installed on the bottom of the mobile trolley, the limiting control end of the descending unit and the input end of the fire extinguishing ring are respectively communicated with the nitrogen pipe network, and the inflation end of the isolation cover is communicated with the nitrogen pipe network through the fire extinguishing ring. The descending unit is used to reset the fire extinguishing ring according to the control signal and to unlock the fire extinguishing ring to achieve height reduction under the control of nitrogen; the isolation cover is used to open when inflating nitrogen and to isolate the air of the electromechanical equipment which needs to be extinguished. The detection device comprises a fire detection device arranged at a set position in the target factory building and an oxygen concentration detector arranged inside the fire extinguishing ring, the fire detection device is used to detect the fire condition in the target factory building in real time and to locate the fire position when detecting fire, and the oxygen concentration detector is used to detect the oxygen concentration inside the isolation cover when extinguishing fire. The control device is electrically connected with the mobile trolley, the electromagnetic valve, the descending unit, the fire detection device and the oxygen concentration detector respectively and is used to output the control signal according to the fire position.

[0008] Further, the descending unit is two, the two descending units are symmetrically arranged and each comprises a chain assembly, a limiter and a reset assembly. The chain assembly comprises a rotating shaft and a chain wound around the rotating shaft; the rotating shaft is rotatably installed on the bottom of the mobile trolley, and the chain is fixedly connected with the fire extinguishing ring. The limiter is used as the limiting control end of the descending unit, is installed on the bottom of the mobile trolley and is lockably matched with the rotating shaft to limit the rotation of the rotating shaft; the limiter is communicated with the nitrogen pipe network and is provided with a built-in push piece type limiting assembly to be pushed to open under the control of nitrogen to achieve unlocking of the rotating shaft. The reset assembly is installed on the bottom of the mobile trolley, is separably matched with the rotating shaft and is electrically connected with the control device to drive the rotating shaft to reversely rotate according to the control signal to achieve resetting of the fire extinguishing ring. The fire-fighting ring includes an inner ring, an outer ring sleeved on the outside of the inner ring, and connecting pipes that are connected to the inner ring and the outer ring respectively; Several of the aforementioned nozzles are disposed on the inner ring; The isolation cover is installed on the outer ring, and its inflation end is connected to the outer ring through a pressure reducing valve; The connecting pipeline is connected to the nitrogen pipeline network.

[0009] Furthermore, both the inner ring and the outer ring are circular. The nozzles on the inner ring are evenly distributed along the circumference, and the distance between adjacent nozzles is 10-15mm. The connecting pipeline is a cross-shaped pipeline, and its center is connected to the nitrogen pipeline through a metal flexible tube.

[0010] Furthermore, the isolation cover includes flame-retardant cloth and multiple flame-retardant tubes; One end of each of the flame-retardant tubes is installed on the outer ring and connected to it through a pressure reducing valve; the multiple flame-retardant tubes form a frustum-shaped skeleton structure with a small upper diameter and a large lower diameter. The flame-retardant cloth is connected to multiple flame-retardant tubes.

[0011] Furthermore, it also includes storage boxes; The storage box is installed on the outer ring; One end of each of the flame-retardant tubes is mounted on the outer ring via a storage box; the storage box is used to store the flame-retardant cloth and the multiple flame-retardant tubes in the initial state.

[0012] Furthermore, the flame-retardant fabric is made of double-layer ceramic fiber; The flame-retardant tube is made of high-silica oxygen material.

[0013] Furthermore, the fire detection device includes a propellant concentration detector, a smoke detector, and a temperature detector, all electrically connected to the controller.

[0014] Furthermore, the running track is made of I-beam structure and its surface is coated with an anti-rust and anti-corrosion coating.

[0015] Meanwhile, the present invention also provides a nitrogen fire suppression process method for electromechanical equipment, based on the nitrogen fire suppression system for electromechanical equipment as described in the foregoing claims, characterized in that it includes the following steps: S1, Detection and Early Warning Phase The fire detection device monitors the target factory building in real time. When an abnormal propellant concentration is detected, the control device activates the audible and visual alarm device and issues a warning signal. S2, Fire Assessment Stage When the fire detection device detects that the smoke concentration exceeds the set smoke threshold value and lasts for a first set time, or detects that the temperature exceeds the set temperature threshold value and the temperature rising rate exceeds the set rising threshold value, the control device determines that the fire state is ignited, and starts the fire extinguishing program; S3, fire extinguishing stage The control device outputs a control signal to the mobile trolley according to the fire location positioned by the fire detection device, controls the mobile trolley to move to the position of the electromechanical equipment to be extinguished along the running track; after the mobile trolley moves to the position, the control device outputs a control signal to the electromagnetic valve to control the electromagnetic valve to open; the lowering unit is unlocked under the control of nitrogen, and the fire ring is lowered to a set height; the isolation cover is inflated by nitrogen, so that the isolation cover is opened and covers the electromechanical equipment to be extinguished, isolates oxygen and gathers nitrogen; nitrogen is sprayed through the spray holes on the fire ring to extinguish the fire; S4, fire extinguishing stop stage When the oxygen concentration detector detects that the oxygen concentration in the isolation cover is lower than the set oxygen threshold value and lasts for a second set time, the control device determines that the fire has been extinguished, controls the electromagnetic valve to close, the isolation cover to be retracted, the lowering unit to reset, and the mobile trolley to return to the initial set position, and completes the fire extinguishing process.

[0016] Further, S2 is specifically: when 2 or more smoke detectors in the same sub-region detect that the smoke concentration is greater than or equal to 0.05% and lasts for more than or equal to 3 seconds, or 2 or more temperature detectors in the same sub-region detect that the temperature is greater than or equal to 50 DEG C and the temperature rising rate is greater than or equal to 5 DEG C / min, the control device determines that the fire state is ignited, and starts the fire extinguishing program; In S4, the oxygen concentration detector detects that the oxygen concentration in the isolation cover is less than or equal to 15% and lasts for more than or equal to 10 seconds, the control device determines that the fire has been extinguished; The retracted isolation cover is specifically retracted into the storage box.

[0017] The beneficial effects of the present application are: The nitrogen fire extinguishing system and process method for electromechanical equipment are especially suitable for high-risk electromechanical equipment such as storage of space engines, chemical high-pressure pump groups and other filling of flammable and explosive media. Through the cooperative fire extinguishing mode of "mobile directional injection + closed space isolation", precise, rapid and low-loss fire extinguishing is realized, and the fire extinguishing demand of a large number of equipment in a large area workshop is met. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a setting schematic view of a fire ring, a nitrogen pipe network, a detection device and a running track in an embodiment of the nitrogen fire extinguishing system for electromechanical equipment of the present application; Figure 2 is a setting schematic view of a mobile trolley and a fire extinguishing device in an embodiment of the nitrogen fire extinguishing system for electromechanical equipment of the present application; Figure 3 is a structural diagram of a fire-fighting ring in an embodiment of a nitrogen fire-fighting system for electromechanical equipment according to the present application.

[0019] The reference signs are as follows: 01 - target factory building 1 - mobile trolley 2 - fire-fighting device, 21 - lowering unit, 22 - fire-fighting ring, 221 - inner ring, 222 - outer ring, 223 - connecting pipeline; 23 - isolation cover, 231 - fire-retardant cloth, 232 - fire-retardant tube 3 - detection device, 4 - nitrogen pipeline network, 5 - running track, 6 - storage box, 7 - metal hose DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in combination with the drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] The nitrogen fire-fighting system for electromechanical equipment provided in the embodiments of the present application, as shown in Figure 1 and Figure 2 , comprises a mobile trolley 1, a fire-fighting device 2, a detection device 3, a control device, a nitrogen pipeline network 4 and a running track 5, and each component cooperates to achieve directional fire extinguishing for the electromechanical equipment on fire.

[0022] The running track 5 is installed on the top of the target factory building 01 and extends to the positions of all electromechanical equipment that need to be extinguished.

[0023] The nitrogen pipeline network 4 provides a nitrogen source passage for the system, comprising a main pipeline, branch pipelines and explosion-proof electromagnetic valves. The pipelines are arranged along the walls and roof of the factory building. The main pipeline is connected with a nitrogen gas source with an output pressure not lower than 10 MPa. The branch pipelines are independently arranged according to the sub-regions of the factory building (1-2 electromechanical equipment corresponding to each region). The electromagnetic valves are respectively arranged in the main pipeline and each branch pipeline to achieve accurate control of the on-off of the nitrogen.

[0024] The mobile trolley 1 provides a displacement carrier for the fire-fighting device 2 and can move back and forth along the running track 5 fixed to the roof of the factory building. The length of the track covers all the sub-regions of the fire-fighting, and the joints are smoothly processed. The bottom of the trolley is fixed with the fire-fighting device 2 through a flange, and the upper part is provided with a driving device comprising a servo motor and an uninterruptible power supply to provide power for the bottom rollers. In cooperation with the track positioning sensor, millimeter-level accurate displacement is achieved, and the response time from the standby position to any sub-region is ≤60 seconds.

[0025] The fire extinguishing device 2 is a core fire extinguishing execution component, arranged at the bottom of the mobile trolley 1, comprising a descending unit 21, a fire extinguishing ring 22 and an isolation cover 23.

[0026] The descending unit 21 is symmetrically arranged on both sides of the fire extinguishing device 2, comprising a stainless steel chain assembly, a rotating shaft and a limiter; two groups are synchronously operated; one end of the chain is connected with the fire extinguishing ring 22, and the other end is wound on the rotating shaft; the limiter is internally provided with a push piece and a spring; after nitrogen (0.3-0.5 MPa) is passed, the push piece is pushed open to unlock the rotating shaft, the chain is released at 0.2 m / s, the fire extinguishing ring 22 is driven to descend by the spring, and when reset, the rotating shaft is reversely driven by a reset assembly (a servo motor) (the reset speed is 0.3 m / s); the fire extinguishing ring 22 can be lowered to 0.4-0.5 m above the equipment on fire, the lifting stroke is 1-3 m and can be adjusted, and is suitable for different equipment heights.

[0027] Referring to Figure 3 , the fire extinguishing ring 22 adopts a 304 stainless steel double-ring coaxial structure, comprising an outer ring 222 and an inner ring 221; the inner ring 221 is provided with a cross-shaped pipeline in the middle, and a metal flexible pipe 7 is connected to the center flange of the pipeline; the outer ring 222 is provided with a pressure reducing valve at the front end, which stably reduces the nitrogen pressure to 1 MPa (fluctuation ± 0.05 MPa), connects the flame-retardant cover and provides pressure for the inflation forming of the flame-retardant cover; the inner ring 221 is used for spraying fire extinguishing nitrogen, and the input pressure is 10 MPa (which can be finely adjusted to 8-12 MPa); the vertical spray holes with a diameter of φ2 mm and a spacing of 10-15 mm are opened at the lower end of the annular pipeline and the cross branch, the spray flow rate is ≥0.5 m³ / min, the fire extinguishing range reaches 4 m×4 m, and it is ensured that the nitrogen spraying is uniform and covers the fire extinguishing area.

[0028] The flame-retardant cover comprises a flame-retardant cloth 231 and a flame-retardant pipe 232; the flame-retardant cloth 231 is in the form of an annular truncated cone (the inner diameter of the upper end is 1.5 m, and the lower end is 3 m), adopts double-layer ceramic fiber belts (temperature resistance ≥1200℃), and 12 high-silicon oxygen flame-retardant pipes 232 (temperature resistance ≥1000℃, inner diameter 20 mm) are fixed uniformly along the circumference in the middle; when not working, the flame-retardant cloth 231 is folded and stored in the storage box 6, and is inflated within 10 seconds after inflation; the flame-retardant pipe 232 forms a support framework, and together with the flame-retardant cloth 231, it covers the equipment to form a 2-3 m high airtight space, which isolates air and gathers nitrogen. The storage box 6 is arranged at the bottom of the fire extinguishing device 2, and is used for storing the flame-retardant cloth 231 and the flame-retardant pipe 232 which are not inflated, so as to ensure that the components are regular when idle.

[0029] The detection device 3 is a fire condition determination and state monitoring component, arranged according to the fire extinguishing sub-regions, each region is provided with one propellant concentration detector, three smoke detectors, three temperature detectors and one oxygen concentration detector, all of which are explosion-proof, and the installation height is 1.5-2 m; Propellant concentration detector: replaceable sensor with detection accuracy ≤0.01%; Smoke detector: sensitivity 0.05-0.15%obs / m; Temperature detector: temperature range -10~150℃, accuracy ±1℃, capable of monitoring temperature rise rate; Oxygen concentration detector: detection range 0-25%, accuracy ±0.5%; Each detector transmits real-time signals to the control device via industrial Ethernet (transmission delay ≤1 second).

[0030] The control device is the core of the system control, including a signal processing unit, an operation module, and a human-machine interface. It is electrically connected to other components through a PLC system. The signal processing unit adopts a redundant design, analyzes and detects signals in real time, and triggers corresponding control logic when abnormalities occur. The operation module supports automatic / manual dual modes. In automatic mode, fire extinguishing is performed according to preset logic, while in manual mode, each component can be remotely controlled. The human-machine interface displays detection data, equipment status, and fire extinguishing progress in real time.

[0031] A nitrogen fire suppression process for electromechanical equipment includes the following steps: S1, Detection and Early Warning Phase The detection device 3 monitors the target plant 01 in real time. When it detects an abnormal propellant concentration (such as 5 ppm of hydrazine), the control device activates the audible and visual alarm device and issues a warning signal. S2, Fire Assessment Stage When two or more smoke detectors in the same sub-area detect a smoke concentration of ≥0.05% for ≥3 seconds, or when two or more heat detectors in the same sub-area detect a temperature of ≥50℃ and a heating rate of ≥5℃ / min, the control device determines that a fire is taking place and initiates the fire extinguishing procedure. S3, Fire Extinguishing Procedure The control device outputs a control signal to the mobile trolley 1 based on the fire location located by the detection device 3, controlling the mobile trolley 1 to move along the running track 5 to the location of the electromechanical equipment that needs to be extinguished (positioning accuracy ±50mm); when the mobile trolley 1 moves into position, the control device outputs a control signal to the solenoid valve, controlling the solenoid valve to open; the lowering unit 21 is unlocked under nitrogen control, lowering the fire ring 22 to the set height (0.4~0.5m above the equipment); the isolation cover 23 is inflated with nitrogen, causing the isolation cover 23 to open and cover the electromechanical equipment that needs to be extinguished, isolating oxygen and gathering nitrogen; nitrogen is sprayed out at a pressure of 10MPa through the nozzles on the fire ring 22 to extinguish the fire; S4, Fire Extinguishing Cessation Phase When the oxygen concentration detector detects that the oxygen concentration in the enclosed space is ≤15% for ≥10 seconds, the control device determines that the fire has been extinguished, controls the solenoid valve to close, retracts the isolation cover 23, resets the lowering unit 21, and returns the mobile trolley 1 to the initial set position, thus completing the fire extinguishing process.

[0032] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical range disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A nitrogen fire extinguishing system for electromechanical equipment, characterized in that: it comprises a mobile trolley (1), a fire extinguishing device (2), a detection device (3), a control device, a nitrogen pipe network (4) and a running track (5); the running track (5) is installed on the top of a target factory building (01) and extends to the positions of all electromechanical equipment that need to be extinguished; the mobile trolley (1) is movably installed on the running track (5) and is used to move to the position of the electromechanical equipment that needs to be extinguished in the target factory building (01) under the control of a control signal; the nitrogen pipe network (4) is arranged on the wall and top of the target factory building (01) and is connected with an external nitrogen source; an electromagnetic valve is installed on the nitrogen pipe network (4) and is opened and closed under the control of a control signal to control the on-off of the nitrogen pipe network (4); the fire extinguishing device (2) comprises a descending unit (21), a fire extinguishing ring (22) and an isolation cover (23); the fire extinguishing ring (22) is provided with a plurality of spray holes for outputting nitrogen to achieve fire extinguishing; the fire extinguishing ring (22) is installed on the output end of the descending unit (21), the isolation cover (23) is installed on the fire extinguishing ring (22), and the spray holes on the fire extinguishing ring (22) are located within the isolation range of the isolation cover (23); the descending unit (21) is installed on the bottom of the mobile trolley (1), the limiting control end of the descending unit (21) and the input end of the fire extinguishing ring (22) are respectively communicated with the nitrogen pipe network (4), and the inflation end of the isolation cover (23) is communicated with the nitrogen pipe network (4) through the fire extinguishing ring (22); the descending unit (21) is used to reset the fire extinguishing ring (22) according to a control signal and to unlock the height drop of the fire extinguishing ring (22) under the control of nitrogen; the isolation cover (23) is used to open when inflating nitrogen and to air isolate the electromechanical equipment that needs to be extinguished; the detection device (3) comprises a fire detection device arranged at a set position in the target factory building (01) and an oxygen concentration detector arranged inside the fire extinguishing ring (22); the fire detection device is used to detect the fire condition in the target factory building (01) in real time and to locate the fire position when detecting fire; the oxygen concentration detector is used to detect the oxygen concentration inside the isolation cover (23) when extinguishing fire; the control device is electrically connected with the mobile trolley (1), the electromagnetic valve, the descending unit (21), the fire detection device and the oxygen concentration detector respectively and is used to output a control signal according to the fire position.

2. The nitrogen fire extinguishing system for electromechanical equipment according to claim 1, characterized in that: the descending unit (21) is two, the two descending units (21) are symmetrically arranged and each comprises a chain assembly, a limiter and a reset assembly; the chain assembly comprises a rotating shaft and a chain wound around the rotating shaft; the rotating shaft is rotatably installed on the bottom of the mobile trolley (1), and the chain is fixedly connected with the fire extinguishing ring (22). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The position limiter is installed at the bottom of the moving trolley (1) and lockingly cooperates with the rotating shaft to limit the rotation of the rotating shaft; the position limiter is communicated with the nitrogen pipe network (4) and has a built-in push-plate type position limiting assembly for being pushed open under the control of nitrogen to realize the unlocking of the rotating shaft; The reset assembly is installed at the bottom of the moving trolley (1) and separably cooperates with the rotating shaft and is electrically connected with the control device to drive the rotating shaft to reversely rotate according to the control signal to realize the resetting of the fire-fighting ring (22); The fire-fighting ring (22) comprises an inner ring (221), an outer ring (222) sleeved outside the inner ring (221), and a connecting pipeline (223) communicated with the inner ring (221) and the outer ring (222) respectively; A plurality of the spray holes are arranged on the inner ring (221); The isolation cover (23) is installed on the outer ring (222) and its inflation end is communicated with the outer ring (222) through a pressure reducing valve; The connecting pipeline (223) is communicated with the nitrogen pipe network (4).

3. The nitrogen fire-fighting system for electromechanical equipment according to claim 2, characterized in that: The inner ring (221) and the outer ring (222) are both circular rings; The spray holes on the inner ring (221) are uniformly distributed in the circumferential direction, and the distance between adjacent spray holes is 10-15 mm; The connecting pipeline (223) is a cross-shaped pipeline, and the center of the cross shape is communicated with the nitrogen pipeline through a metal hose (7).

4. The nitrogen fire-fighting system for electromechanical equipment according to claim 2 or 3, characterized in that: The isolation cover (23) comprises a fire-retardant cloth (231) and a plurality of fire-retardant pipes (232); One end of each of the plurality of fire-retardant pipes (232) is installed on the outer ring (222) and communicated with the outer ring (222) through a pressure reducing valve; the plurality of fire-retardant pipes (232) form a circular truncated cone framework structure with a small upper end diameter and a large lower end diameter; The fire-retardant cloth (231) is connected to the plurality of fire-retardant pipes (232).

5. The nitrogen fire-fighting system for electromechanical equipment according to claim 4, characterized in that: It further comprises a storage box (6); The storage box (6) is installed on the outer ring (222); One end of each of the plurality of fire-retardant pipes (232) is installed on the outer ring (222) through the storage box (6); the storage box (6) is used to store the fire-retardant cloth (231) and the plurality of fire-retardant pipes (232) in the initial state.

6. The nitrogen fire-fighting system for electromechanical equipment according to claim 5, characterized in that: The material of the fire-retardant cloth (231) is double-layer ceramic fiber; The material of the fire-retardant pipe (232) is high-silicon oxide.

7. The nitrogen fire-fighting system for electromechanical equipment according to claim 1, characterized in that: The fire detection device comprises a propellant concentration detector, a smoke detector and a temperature detector which are electrically connected with the controller respectively.

8. The nitrogen fire-fighting system for electromechanical equipment according to claim 1, characterized in that: The running track (5) is made of an I-beam structure and coated with a rust-proof and corrosion-proof coating on the surface.

9. A nitrogen fire extinguishing process method for electromechanical equipment, based on a nitrogen fire extinguishing system for electromechanical equipment according to any one of claims 1-8, characterized in that, Comprising the following steps: S1, detection and early warning stage The fire detection device detects the target factory (01) in real time, and when the propellant concentration is detected to be abnormal, the control device starts the sound and light alarm device to issue a warning signal; S2, fire determination stage When the fire detection device detects that the smoke concentration exceeds the set smoke threshold and lasts for a first set time, or detects that the temperature exceeds the set temperature threshold and the temperature rise rate exceeds the set rise threshold, the control device determines that it is on fire and starts the fire extinguishing program; S3, fire extinguishing stage The control device outputs a control signal to the mobile trolley (1) according to the fire location positioned by the fire detection device, controls the mobile trolley (1) to move to the position of the electromechanical equipment that needs to be extinguished along the running track (5); After the mobile trolley (1) moves to the position, the control device outputs a control signal to the electromagnetic valve to control the electromagnetic valve to open; The lowering unit (21) is unlocked under the control of nitrogen, and the fire ring (22) is lowered to a set height; The isolation cover (23) is inflated by nitrogen, so that the isolation cover (23) is opened and covers the electromechanical equipment that needs to be extinguished, isolates oxygen and gathers nitrogen; Nitrogen is sprayed through the spray hole on the fire ring (22) to extinguish the fire; S4, fire extinguishing stop stage When the oxygen concentration detector detects that the oxygen concentration inside the isolation cover (23) is lower than the set oxygen threshold and lasts for a second set time, the control device determines that the fire has been extinguished, controls the electromagnetic valve to close, the isolation cover (23) to be retracted, the lowering unit (21) to be reset, and the mobile trolley (1) to return to the initial set position, and completes the fire extinguishing process.

10. The nitrogen fire extinguishing process method for electromechanical equipment according to claim 9, characterized in that: S2 is specifically: when 2 or more smoke detectors in the same sub-region detect that the smoke concentration is greater than or equal to 0.05% and lasts for more than or equal to 3 seconds, or 2 or more temperature detectors in the same sub-region detect that the temperature is greater than or equal to 50°C and the temperature rise rate is greater than or equal to 5°C / min, the control device determines that it is on fire and starts the fire extinguishing program; In S4, the oxygen concentration detector detects that the oxygen concentration inside the isolation cover (23) is less than or equal to 15% and lasts for more than or equal to 10 seconds, the control device determines that the fire has been extinguished; The retracted isolation cover (23) is specifically the isolation cover (23) is retracted into the storage box (6).

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