Automatic fire extinguishing system for plateau alternating-current electric locomotive

Abstract

The automatic fire extinguishing system for the plateau alternating-current electric locomotive comprises a first fire extinguishing assembly, a second fire extinguishing assembly and a control assembly, the first fire extinguishing assembly comprises a first gas cylinder and a first spray head, and the second fire extinguishing assembly comprises a second gas cylinder and a second spray head; the control assembly comprises a first normally-open solenoid valve, a first normally-closed solenoid valve, a second normally-open solenoid valve, a second normally-closed solenoid valve and a controller, the first gas cylinder and the first nozzle are arranged near the traction converter cabinet, and the first gas cylinder is connected with the first nozzle through the first normally-open solenoid valve and connected with the public pipeline through the first normally-closed solenoid valve; the second gas cylinder and the second spray head are arranged near the power battery cabinet, the second gas cylinder is connected with the second spray head through a second normally-open solenoid valve and connected with the public pipeline through a second normally-closed solenoid valve, and the controller is used for controlling the first gas cylinder and / or the second gas cylinder close to the second gas cylinder to spray out the fire extinguishing medium. The fire extinguishing system is more timely and effective, simpler in pipeline and convenient to maintain and repair.

Description

Technical Field

[0001] This invention belongs to the field of locomotive fire extinguishing technology, specifically an automatic fire extinguishing system for high-altitude AC electric locomotives. Background Technology

[0002] With the rapid development of railway technology, the requirements for locomotive fire safety are constantly increasing. Among them, electric locomotives have numerous and valuable electrical devices inside, posing many fire hazards, especially traction converter cabinets and power battery cabinets.

[0003] In related technologies, fire extinguishers are typically equipped with accessories for electrical equipment to extinguish fires promptly in the event of a fire. However, the spatial arrangement of existing fire extinguishers and pipelines within locomotives is not entirely rational, failing to meet the requirements for timely and effective fire suppression of electrical equipment. This problem urgently needs to be solved. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide an automatic fire extinguishing system for high-altitude AC electric locomotives, so as to solve at least one aspect of the problems and defects mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides an automatic fire extinguishing system for high-altitude AC electric locomotives, comprising a first fire extinguishing component, a second fire extinguishing component, and a control component. The first fire extinguishing component comprises a first gas cylinder and a first nozzle, the second fire extinguishing component comprises a second gas cylinder and a second nozzle, and the control component comprises a first normally open solenoid valve, a first normally closed solenoid valve, a second normally open solenoid valve, a second normally closed solenoid valve, and a controller. The first gas cylinder and the first nozzle are used to be installed near the traction converter cabinet. The first gas cylinder is connected to the first nozzle through the first normally open solenoid valve and to the common pipeline through the first normally closed solenoid valve. The second gas cylinder and the second nozzle are used to be installed near the power battery cabinet. The second gas cylinder is connected to the second nozzle through the second normally open solenoid valve and to the common pipeline through the second normally closed solenoid valve. The controller is electrically connected to the first gas cylinder, the second gas cylinder, the first normally open solenoid valve, the first normally closed solenoid valve, the second normally open solenoid valve, and the second normally closed solenoid valve, respectively, and is used to control the discharge of extinguishing medium from the adjacent first gas cylinder and / or second gas cylinder.

[0006] As a further embodiment of the present invention, when the controller opens the first gas cylinder or the second gas cylinder and detects that the pressure in the corresponding pipeline is less than the lower pressure limit, the controller then controls the next first gas cylinder or the second gas cylinder to open.

[0007] As a further embodiment of the present invention, the first gas cylinder is connected to the first normally open solenoid valve and the first normally closed solenoid valve after passing through the first one-way valve. And / or, the second gas cylinder is connected to the second normally open solenoid valve and the second normally closed solenoid valve respectively after passing through the second one-way valve.

[0008] As a further embodiment of the present invention, it also includes: An environmental monitoring component, comprising a first environmental monitoring component and a second environmental monitoring component; The first environmental detection component is used to detect the environmental parameters of the traction converter cabinet, and the second environmental detection component is used to detect the environmental parameters of the power battery cabinet. The controller compares environmental parameters with corresponding thresholds. If the parameters exceed the thresholds, a fire warning or alarm message is triggered.

[0009] As a further embodiment of the present invention, the environmental parameters of the traction converter cabinet include at least one of a first ambient temperature, a first smoke concentration, and a busbar temperature. And / or, the environmental parameters of the power battery cabinet include at least one of the second ambient temperature and the second smoke concentration.

[0010] As a further embodiment of the present invention, the thresholds include a first ambient temperature lower limit threshold, a busbar temperature lower limit threshold, a first smoke concentration threshold, a second ambient temperature lower limit threshold, and a second smoke concentration threshold. When the first ambient temperature exceeds the lower limit threshold of the first ambient temperature, or when the first smoke concentration exceeds the first smoke concentration threshold, or when the busbar temperature exceeds the lower limit threshold of the busbar temperature, the controller triggers a fire warning message for the traction converter cabinet. And / or, when the second ambient temperature exceeds the lower limit threshold of the second ambient temperature, or when the second smoke concentration exceeds the second smoke concentration threshold, the controller triggers a fire warning message for the power battery cabinet.

[0011] As a further embodiment of the present invention, the threshold also includes a first ambient temperature upper limit threshold, a first temperature rise rate threshold, a second ambient temperature upper limit threshold, and a second temperature rise rate threshold. When the first ambient temperature exceeds the first ambient temperature upper limit threshold, or when the first smoke concentration exceeds the first smoke concentration threshold and the temperature rise rate of the first ambient temperature exceeds the first temperature rise rate threshold, or when the busbar temperature exceeds the busbar temperature upper limit threshold, the controller triggers a fire alarm message for the traction converter cabinet. And / or, when the second ambient temperature exceeds the upper limit threshold of the second ambient temperature, or when the second smoke concentration exceeds the second smoke concentration threshold and the rate of temperature rise of the second ambient temperature exceeds the second rate of temperature rise threshold, the controller triggers a fire alarm message for the power battery cabinet.

[0012] As a further embodiment of the present invention, it also includes: an alarm, which is electrically connected to the controller and is used to respond to an alarm signal based on fire warning or alarm information.

[0013] As a further embodiment of the present invention, it also includes: The fault detection device is electrically connected to the controller and is used to detect fault information in the traction converter cabinet or power battery cabinet.

[0014] Secondly, the present invention also provides a method for calculating the amount of fire extinguishing agent used in an electric locomotive, for calculating the amount of the first and second gas cylinders in any of the automatic fire extinguishing systems for high-altitude AC electric locomotives provided in the first aspect, including: Determine the type and design concentration of the extinguishing agent, and calculate the amount of extinguishing agent to be used; wherein the amount of extinguishing agent used includes the design amount, pipeline loss amount, and residual amount in the cylinder.

[0015] Thirdly, the present invention also provides a fatigue strength assessment method for gas cylinders, used to assess the fatigue strength of the first and second gas cylinders in any of the automatic fire extinguishing systems for high-altitude AC electric locomotives provided in the first aspect, comprising: Determine the type of masterbatch for the gas cylinder and the corresponding fatigue grade curve, design the fatigue damage calculation formula, and analyze the fatigue load conditions. The fatigue strength of the base material is evaluated to determine whether the long-life random vibration condition meets the requirements, and the fatigue strength under random vibration is evaluated.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the automatic fire extinguishing system for high-altitude AC electric locomotives includes a first fire extinguishing component, a second fire extinguishing component, and a control component. The first fire extinguishing component includes a first gas cylinder and a first nozzle; the second fire extinguishing component includes a second gas cylinder and a second nozzle; the control component includes a first normally open solenoid valve, a first normally closed solenoid valve, a second normally open solenoid valve, a second normally closed solenoid valve, and a controller. The first gas cylinder and the first nozzle are installed near the traction converter cabinet. The first gas cylinder is connected to the first nozzle through the first normally open solenoid valve and to a common pipeline through the first normally closed solenoid valve. The second gas cylinder and the second nozzle are installed near the power battery cabinet. The second gas cylinder is connected to the second nozzle through the second normally open solenoid valve and to a common pipeline through the second normally closed solenoid valve. The controller is electrically connected to the first gas cylinder, the second gas cylinder, the first normally open solenoid valve, the first normally closed solenoid valve, the second normally open solenoid valve, and the second normally closed solenoid valve, respectively, for controlling the nearby first gas cylinder and / or second gas cylinder to spray the fire extinguishing medium.

[0017] Therefore, the automatic fire extinguishing system for high-altitude AC electric locomotives provided by the present invention can, on the one hand, utilize gas cylinders attached to electrical equipment for fire extinguishing, resulting in shorter pipelines and a more timely and effective fire extinguishing response; on the other hand, when the fire is large, gas cylinders located further away can be used to enhance fire extinguishing, resulting in a more thorough fire extinguishing. Moreover, since gas cylinders in all directions are connected through a common pipeline, the space required for pipeline layout can be significantly reduced, making pipeline maintenance and repair operations more convenient. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 A schematic diagram of the layout of the automatic fire extinguishing system for high-altitude AC electric locomotives provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the piping connections for the central control components; Figure 3 for Figure 1 Schematic diagram of residual extinguishing agent inside the medium-sized gas cylinder; Figure 4 for Figure 1 Dimensional diagram of the medium-sized gas cylinder; Figure 5 The SN curve for high-cycle fatigue; Figure 6 This is the SN curve for welded joints in steel structures under the IIW standard.

[0020] Figure label: 10. Traction converter cabinet; 20. Power battery cabinet; 100. First fire extinguishing assembly; 110. First gas cylinder; 120. First sprinkler head; 200. Second fire extinguishing assembly; 210. Second gas cylinder; 220. Second nozzle; 300. Control component; 310. First normally open solenoid valve; 320. First normally closed solenoid valve; 330. Second normally open solenoid valve; 340. Second normally closed solenoid valve; 400. Environmental monitoring component; 410. First environmental monitoring component; 420. Second environmental monitoring component. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] Existing electric locomotives contain numerous electrical devices, posing many fire hazards, such as contactor arcing and electrical short circuits in traction converter cabinets, and overcharging, over-discharging, and damage to power batteries in power battery cabinets. Currently, the single-cylinder-to-single-cabinet fire extinguishing method is ineffective in protecting electrical equipment when solenoid valves are stuck, cylinders are depressurized, or the fire exceeds the extinguishing capacity of a single cylinder group, and it also easily threatens the safety of firefighters.

[0028] Analyzing the process and causes of past locomotive and rolling stock fires, the problems can be summarized as follows: First, some locomotives only have fire detection systems but lack fire extinguishing execution systems, making it impossible to extinguish fires in their early stages. Second, due to space limitations within the locomotives, when a fire breaks out and becomes large, it is difficult to integrate the firefighting resources of the entire vehicle, often resulting in the fire not being controlled in a timely and effective manner and causing significant equipment damage. Third, after a fire occurs, faulty circuits cannot be disconnected and isolated in a timely manner, preventing the fire from being completely contained. Fourth, high-altitude locomotives place higher demands on the ability of gas cylinders to withstand pressure changes and the insulation capabilities of circuit components.

[0029] Firstly, please refer to Figure 1-2 As shown, this embodiment of the invention provides an automatic fire extinguishing system for high-altitude AC electric locomotives, including a first fire extinguishing component 100, a second fire extinguishing component 200, and a control component 300. The first fire extinguishing component 100 includes a first gas cylinder 110 and a first nozzle 120. The second fire extinguishing component 200 includes a second gas cylinder 210 and a second nozzle 220. The control component 300 includes a first normally open solenoid valve 310, a first normally closed solenoid valve 320, a second normally open solenoid valve 330, a second normally closed solenoid valve 340, and a controller.

[0030] The first gas cylinder 110 and the first nozzle 120 are installed near the traction converter cabinet 10. The first gas cylinder 110 is connected to the first nozzle 120 via a first normally open solenoid valve 310 and to a common pipeline via a first normally closed solenoid valve 320. The second gas cylinder 210 and the second nozzle 220 are installed near the power battery cabinet 20. The second gas cylinder 210 is connected to the second nozzle 220 via a second normally open solenoid valve 330 and to a common pipeline via a second normally closed solenoid valve 340.

[0031] The controller is electrically connected to the first gas cylinder 110, the second gas cylinder 210, the first normally open solenoid valve 310, the first normally closed solenoid valve 320, the second normally open solenoid valve 330, and the second normally closed solenoid valve 340, respectively, and is used to control the first gas cylinder 110 and / or the second gas cylinder 210 to spray fire extinguishing medium.

[0032] In this embodiment, the locomotive has at least one traction converter cabinet 10 and at least one power battery cabinet 20 on its front. For example, two traction converter cabinets 10 are arranged opposite each other in the front of the locomotive, and two power battery cabinets 20 are arranged opposite each other in the front of the locomotive.

[0033] In this embodiment, the first fire extinguishing component 100 and the second fire extinguishing component 200 are used for fire extinguishing. Both can include gas cylinders and nozzles. The gas cylinder opening is equipped with an electric explosion valve for electrically controlled opening. In this embodiment, the control component 300 is used to control the on / off state of each pipeline and can include normally open solenoid valves, normally closed solenoid valves, and a controller. Specifically, one or more first gas cylinders 110 can be placed near the traction converter cabinet 10, with multiple first gas cylinders 110 connected in parallel. A first nozzle 120 can be positioned above the traction converter cabinet 10. Similarly, one or more second gas cylinders 210 can be placed near the power battery cabinet 20, with multiple second gas cylinders 210 connected in parallel. A second nozzle 220 can be positioned above the power battery cabinet 20. The first gas cylinder 110 is connected to the first nozzle 120 via a first normally open solenoid valve 310, ensuring rapid opening of the first gas cylinder 110. The first gas cylinder 110 sprays towards the nearest first nozzle 120. Correspondingly, the second gas cylinder 210 is connected to the second nozzle 220 through the second normally open solenoid valve 330, which can ensure that the second gas cylinder 210 sprays towards the nearest second nozzle 220 quickly when it is opened. In addition, the first gas cylinder 110 is connected to the common pipeline through the first normally closed solenoid valve 320, and the second gas cylinder 210 is connected to the common pipeline through the second normally closed solenoid valve 340. The first gas cylinder 110 or the second gas cylinder 210 can also provide extinguishing medium to the more distant first nozzle 120 or second nozzle 220 through the common pipeline.

[0034] It should be noted that, as Figure 2 As shown, when the upper left traction converter cabinet 10 does not require fire suppression but the upper right power battery cabinet 20 does, the upper left first normally closed solenoid valve 320 opens, the upper left first normally open solenoid valve 310 closes, and the upper right second normally open solenoid valve 330 and the upper right second normally closed solenoid valve 340 both open, and so on.

[0035] Therefore, compared to the existing method of extinguishing fires by placing fire extinguishers near locomotive equipment, the automatic fire extinguishing system for high-altitude AC electric locomotives provided in this embodiment of the invention can, on the one hand, utilize gas cylinders attached to electrical equipment for fire extinguishing, resulting in shorter pipelines and a more timely and effective fire extinguishing response; on the other hand, in cases of large fires, gas cylinders located further away can be used to enhance fire extinguishing, resulting in more thorough fire suppression. Moreover, since gas cylinders in all directions are connected through a common pipeline, the space required for pipeline layout can be significantly reduced, making pipeline maintenance and repair operations more convenient.

[0036] In some embodiments, when the controller opens the first gas cylinder 110 or the second gas cylinder 210 and detects that the pressure in the corresponding pipeline is less than the lower pressure limit, the controller then controls the next first gas cylinder 110 or the second gas cylinder 210 to open.

[0037] In other words, such as Figure 2 As shown, if no extinguishing agent is sprayed from the first gas cylinder 110 or the second gas cylinder 210 when the controller opens the first gas cylinder 110 or the second gas cylinder 210, or only a small amount of extinguishing agent is sprayed, it indicates that the first gas cylinder 110 or the second gas cylinder 210 has already failed before it was opened. In this case, it is necessary to control the opening of the next first gas cylinder 110 or the second gas cylinder 210.

[0038] In addition, if the controller does not detect the opening signal of the electric explosion valve on the first gas cylinder 110 or the second gas cylinder 210 when it opens, it means that the electric explosion valve has also failed and cannot be opened. Therefore, the controller needs to control the opening of the next first gas cylinder 110 or the second gas cylinder 210.

[0039] In some embodiments, the first gas cylinder 110 is connected to the first normally open solenoid valve 310 and the first normally closed solenoid valve 320 after passing through the first one-way valve.

[0040] In this way, such as Figure 2 As shown, the extinguishing medium in the first gas cylinder 110 can only be sprayed out in one direction, and will not cause the extinguishing medium in the pipeline to flow back into the first gas cylinder 110.

[0041] And / or, the second gas cylinder 210 is connected to the second normally open solenoid valve 330 and the second normally closed solenoid valve 340 respectively via the second check valve.

[0042] In this way, such as Figure 2 As shown, this ensures that the extinguishing medium in the second gas cylinder 210 can only be sprayed out in one direction, and will not cause the extinguishing medium in the pipeline to flow back into the second gas cylinder 210.

[0043] Furthermore, in this embodiment, the automatic fire extinguishing system for high-altitude AC electric locomotives provided by the present invention further includes: The environmental monitoring component 400 includes a first environmental monitoring component 410 and a second environmental monitoring component 420.

[0044] The first environmental detection component 410 is used to detect the environmental parameters of the traction converter cabinet 10, and the second environmental detection component 420 is used to detect the environmental parameters of the power battery cabinet 20.

[0045] The controller compares environmental parameters with corresponding thresholds. If the parameters exceed the thresholds, a fire warning or alarm message is triggered.

[0046] Specifically, such as Figure 1 As shown, environmental parameters can include ambient temperature, smoke concentration, and the temperature of key components on electrical equipment. The first environmental detection component 410 detects the environmental parameters of the traction converter cabinet 10, and the second environmental detection component 420 detects the environmental parameters of the power battery cabinet 20. This allows for accurate determination of the fire situation inside the traction converter cabinet 10 or the power battery cabinet 20, which facilitates alerting operators or automatically triggering fire suppression, enabling automated fire suppression and making the system more intelligent.

[0047] Furthermore, in this embodiment, the environmental parameters of the traction converter cabinet 10 include at least one of the following: first ambient temperature, first smoke concentration, and busbar temperature.

[0048] And / or, the environmental parameters of the power battery cabinet 20 include at least one of a second ambient temperature and a second smoke concentration.

[0049] Specifically, ambient temperature and smoke concentration can be accurately detected by a smoke-temperature composite detector. One or more smoke-temperature composite detectors can be installed in the traction converter cabinet 10 to detect the first ambient temperature and the first smoke concentration, or one or more smoke-temperature composite detectors can be installed in the power battery cabinet 20 to detect the second ambient temperature and the second smoke concentration. Additionally, busbar temperature can be accurately detected by an infrared camera. One or more infrared cameras can be installed in the traction converter cabinet 10 to detect the busbar temperature.

[0050] Furthermore, in this embodiment, the thresholds include a first ambient temperature lower limit threshold, a busbar temperature lower limit threshold, a first smoke concentration threshold, a second ambient temperature lower limit threshold, and a second smoke concentration threshold.

[0051] When the first ambient temperature exceeds the lower limit threshold of the first ambient temperature, or when the first smoke concentration exceeds the first smoke concentration threshold, or when the busbar temperature exceeds the lower limit threshold of the busbar temperature, the controller triggers a fire warning message for the traction converter cabinet 10.

[0052] And / or, when the second ambient temperature exceeds the lower limit threshold of the second ambient temperature, or when the second smoke concentration exceeds the second smoke concentration threshold, the controller triggers a fire warning message for the power battery cabinet 20.

[0053] For example, when the first ambient temperature exceeds 75°C, or when the first smoke concentration exceeds 0.28 dB / m³, or when the busbar temperature exceeds 150°C, the controller triggers a fire warning message in the traction converter cabinet 10 to remind the driver that a fire may be occurring.

[0054] For example, when the second ambient temperature exceeds 75°C, or when the second smoke concentration exceeds 0.28 dB / m³, the controller triggers a fire warning message for the power battery cabinet 20 to remind the driver that a fire may be occurring.

[0055] The threshold can be determined according to actual needs, and no excessive restrictions are imposed in this embodiment.

[0056] Furthermore, in this embodiment, the threshold also includes a first ambient temperature upper limit threshold, a first temperature rise rate threshold, a second ambient temperature upper limit threshold, and a second temperature rise rate threshold.

[0057] When the first ambient temperature exceeds the first ambient temperature upper limit threshold, or when the first smoke concentration exceeds the first smoke concentration threshold and the rate of temperature rise of the first ambient temperature exceeds the first rate of temperature rise threshold, or when the busbar temperature exceeds the busbar temperature upper limit threshold, the controller triggers a fire alarm message for the traction converter cabinet 10.

[0058] And / or, when the second ambient temperature exceeds the upper limit threshold of the second ambient temperature, or when the second smoke concentration exceeds the second smoke concentration threshold and the rate of temperature rise of the second ambient temperature exceeds the second rate of temperature rise threshold, the controller triggers a fire alarm message for the power battery cabinet 20.

[0059] For example, when the first ambient temperature exceeds 90°C, or when the first smoke concentration exceeds 0.28 dB / m and the temperature rise rate of the first ambient temperature exceeds 3°C / min, or when the busbar temperature exceeds 180°C, the controller triggers a fire alarm message in the traction converter cabinet 10 to remind the driver that a fire has occurred.

[0060] For example, when the second ambient temperature exceeds 90°C, or when the second smoke concentration exceeds 0.28 dB / m³ and the temperature rise rate of the second ambient temperature exceeds 3°C / min, the controller triggers a fire warning message for the power battery cabinet 20 to remind the driver that a fire has occurred.

[0061] The threshold can be determined according to actual needs, and no excessive restrictions are imposed in this embodiment.

[0062] Furthermore, in this embodiment, the automatic fire extinguishing system for high-altitude AC electric locomotives provided by the present invention also includes: an alarm, which is electrically connected to the controller and is used to respond to alarm signals based on fire warning or alarm information.

[0063] Specifically, the alarm can be an audio alert, a text alert, or an optical alert, which can promptly remind operators of the current fire situation and is more user-friendly.

[0064] In some embodiments, the automatic fire extinguishing system for high-altitude AC electric locomotives provided in this invention further includes: The fault detection device is electrically connected to the controller and is used to detect fault information in the traction converter cabinet 10 or the power battery cabinet 20.

[0065] In this way, by detecting fault information in the traction converter cabinet 10 or the power battery cabinet 20 through the fault detection device, the operator can promptly disconnect or isolate the faulty circuit in the traction converter cabinet 10 or the power battery cabinet 20 to avoid affecting other circuits of the locomotive.

[0066] Secondly, embodiments of the present invention also provide a method for calculating the amount of extinguishing agent, used to calculate the amount of the first gas cylinder 110 and the second gas cylinder 210 in the above-mentioned automatic fire extinguishing system for high-altitude AC electric locomotives, including: Determine the type and design concentration of the extinguishing agent, and calculate the amount of extinguishing agent to be used; the amount to be used includes the design amount, pipeline loss, and residual amount in the cylinder.

[0067] 1. The contents of the gas cylinder cannot be completely emptied, such as... Figure 3 As shown.

[0068] 1.1 Selection of extinguishing concentration (refer to relevant standards).

[0069] For electrical fires, the minimum design concentration is required to be 6%, while the concentration of perfluorohexanone that is toxic to humans is ≥10%. According to DB37T 3642-2019 Standard for Design, Construction and Acceptance of Perfluorohexanone Fire Extinguishing Systems, section 5.1.7, for protected areas such as oil-immersed transformer rooms, distribution rooms with oil-filled switches, and standby generator rooms, the fire extinguishing design concentration should preferably be 7%.

[0070] Based on the experimental results, an 8% concentration was able to extinguish the fire in time, while a 6% concentration could extinguish wood fires but not cable fires. Therefore, 8% was adopted as the design concentration for fire extinguishing.

[0071] 1.2 Calculation of extinguishing agent dosage.

[0072] According to the calculation formula in 7.2.10 of DB 37 / T 3642:

[0073] In the formula: W —Fire extinguishing design dosage or inerting design dosage (Kg); C 1—Fire extinguishing design concentration or inerting design concentration (%), taken as 8%; S —Specific volume (m3 / Kg) of extinguishing agent superheated vapor at 101 kPa and the lowest ambient temperature of the protected area. V —Net volume of the protected area (m3); K —Altitude correction factor, the value of which is 1 (the lowest altitude value is used for calculation).

[0074] The specific volume of superheated vapor of the extinguishing agent at different temperatures under 101 kPa atmospheric pressure is calculated using the following formula:

[0075] In the formula: T —The lowest ambient temperature (°C) within the protected area is taken as 20°C; K 1 = 0.0664; K 2 = 0.000274.

[0076] The calculated usage of extinguishing agents is shown in the table below:

[0077] The required amount of extinguishing medium = the design amount of extinguishing medium in the cabinet W + the residual and loss in the pipeline (longest pipeline) W1 + the residual in the cylinder W2, where W1 = the inner wall area of ​​the pipeline × 1mm thickness × density (perfluorohexanone density 1.6) + the pipeline volume × 5% (the concentration of extinguishing agent in the pipeline cavity) × density (perfluorohexanone density 1.6), and W2 = the volume below the liquid surface of the gas cylinder × density (perfluorohexanone density 1.6).

[0078] For example: The power battery cabinet W2 weighs 5.34 kg. The length of the pipeline to the furthest power battery cabinet is 3.15 m + 1.1 m + 2.4 m + 1.9 m = 8.55 m, with a volume of 0.967 L. The weight loss due to pipeline loss is 0.967 L. 1.6 5%+π d 1 L ρ = 0.07736 + 0.516 = 0.59336 kg, pressure at the end of the pipeline = 2.5 - 0.53 = 1.97 MPa, weight of residual extinguishing agent at the bottom of the cylinder = S h ρ=3.14 65 65 10 1.6 / 1000000=0.22kg. Assuming a standard requirement of 5% residue in the gas cylinder space, the residual amount is calculated to be 6L. 5% 1.6 = 0.48 kg.

[0079] The required weight of the power battery cabinet is 5.3kg + 0.48 + 0.59336 + 0.22 = 6.59kg. The actual storage is 6kg, with an effective discharge of 4.93kg, resulting in an actual concentration of 7.5%. According to TJ / JW 001C-2024, the power battery cabinet must include both cooling and fire extinguishing functions, and the extinguishing cylinders used for cooling and fire extinguishing cannot be the same. Therefore, the power battery cabinet uses two 6L gas cylinders, each filled with 6kg of extinguishing agent. Figure 4 As shown.

[0080] The weight of the extinguishing agent remaining at the bottom of the bottle = S h ρ=3.14 65 65 10 1.6 / 1000000=0.22kg. Assuming a standard requirement of 5% residue in the gas cylinder space, the residual amount is calculated to be 6L. 2 5% 1.6 = 0.96 kg. Based on the calculation formula, the converter cabinet W1 can be calculated to be 6.1 kg. The pipe length to the farthest converter cabinet is 3.45 m + 0.42 m + 2.1 m + 0.65 m = 6.62 m, with a volume of 0.749 L. The weight of the pipe loss is 0.749 L. 1.6 5%+π d 1 L ρ = 0.05992 + 0.4 = 0.45992 kg. Pipeline end pressure = 2.5 - 0.413 = 2.087 MPa. Required weight of the converter cabinet = 6.1 + 0.48 2 + 0.45992 = 7.52 kg. Using two 6L cylinders, a total of 12 kg of extinguishing agent is stored. Therefore, a total of 48 kg of perfluorohexanone is needed, requiring 8 6L cylinders.

[0081] Thirdly, embodiments of the present invention also provide a fatigue strength assessment method for gas cylinders, used to assess the fatigue strength of the first gas cylinder 110 and the second gas cylinder 210 in the aforementioned automatic fire extinguishing system for high-altitude AC electric locomotives, comprising: Determine the type of masterbatch for the gas cylinder and the corresponding fatigue grade curve, design the fatigue damage calculation formula, and analyze the fatigue load conditions. Evaluate the fatigue strength of the base material, determine whether the long-life random vibration condition meets the requirements, and evaluate the fatigue strength under random vibration.

[0082] 2. Calculation steps for assessing the fatigue strength of the base material and random vibration fatigue of fire extinguishing system cylinders based on the IIW standard: 2.1 Define the material type: Define the material of the fire extinguishing system cylinder. The cylinder material involved in this invention is steel.

[0083] 2.2 Determine the type of base material: According to Table 3.2-1 of the IIW standard, determine the type of base material of the fire extinguishing system cylinder and the corresponding fatigue rating curve.

[0084] 2.3 Fatigue Damage Calculation Formula In the IIW standard, based on the stress range To measure the fatigue characteristics of the base material, stress range is used. The number of cycles, N, represents the Sn-S curve of the material under this standard. This indicates the stress range in the load spectrum. The number of loops, This represents the total number of cycles that will lead to damage within this stress range. Fatigue failure occurs under the following condition:

[0085] In the IIW standard, the stress range and number of cycles are both expressed logarithmically, forming a bislope curve with two inflection points, such as... Figure 5 As shown, the mathematical expression for the SN curve is:

[0086] In the IIW standard, the fatigue damage calculation formula is as follows:

[0087] in, , These represent the stress range of the SN curve at the inflection point of the evaluation point, respectively, and the corresponding number of cycles are respectively. and ; , These represent the slopes of the two ends of the SN curve, respectively. Representative stress range The number of stress cycles. Figure 6 For the SN curve of IIW, take , , , The fatigue limit of constant amplitude at 10^7 cycles and the two inflection points of the SN curve. The constant amplitude fatigue limit at 10^9 cycles The values ​​are shown in the table below:

[0088] 2.4 Fatigue Loading Conditions The fatigue strength load and working conditions are shown in Table 3 below:

[0089] 2.5 Evaluation of fatigue strength of the base material After selecting the fatigue grade FAT curve, the allowable stress range corresponding to the number of cycles required by the design is obtained according to the fatigue damage calculation formula mentioned above. If the maximum stress range of the gas cylinder base material under different fatigue load conditions (as shown in Table 3) is less than the allowable stress range corresponding to the number of cycles required by the design, it can be determined that the fatigue strength of the gas cylinder base material meets the requirements.

[0090] 2.6 Long-life random vibration conditions According to standard GB / T 21563-2008, "Impact and Vibration Test of Rolling Stock Equipment, Category I, Class B," the ASD spectrum of the body-mounted equipment is used. When the mass is less than 500 kg, f1=5Hz and f2=150Hz can be selected. Judgment criterion: if the total loss D is less than 1, it indicates that the structure meets the fatigue life requirements.

[0091] 2.7 Evaluation of Fatigue Strength from Random Vibration During vertical random vibration, N1σ = +∞ for 1σ stress (maximum 36.99 MPa); N2σ = +∞ for 2σ stress (maximum 73.99 MPa); and N3σ = +∞ for 3σ stress (maximum 110.98 MPa). During transverse random vibration, N1σ = +∞ for 1σ stress (maximum 26.16 MPa); N2σ = +∞ for 2σ stress (maximum 52.32 MPa); and N3σ = +∞ for 3σ stress (maximum 78.48 MPa). During longitudinal random vibration, N1σ = +∞ for 1σ stress (maximum 38.85 MPa); N2σ = +∞ for 2σ stress (maximum 77.71 MPa); and N3σ = +∞ for 3σ stress (maximum 116.56 MPa). First, the stress responses of the gas cylinder under longitudinal, lateral, and vertical acceleration excitations (1σ, 2σ, and 3σ) are obtained respectively. Then, based on the formulas, the number of cycles N1σ, N2σ, and N3σ corresponding to the longitudinal, lateral, and vertical random vibration stresses 1σ, 2σ, and 3σ are calculated respectively. The average vibration frequency of the gas cylinder during random vibration is v = (f2 - f1) / 2 = 72.5 Hz. With 5 hours of testing each in the vertical, lateral, and longitudinal directions, the actual number of cycles in each direction is 1.305e. 6 n1σ=0.683vT=8.913e 5 ,n2σ=0.271vT=3.537e 5 ,n3σ=0.0433vT=5.651e 4 .

[0092] According to the formula D=(n1σ / N1σ)+(n2σ / N2σ)+(n3σ / N3σ), the total damage in the three directions of random vertical vibration, random horizontal vibration and random longitudinal vibration of the gas cylinder can be calculated. If the total damage in all three directions is less than 1, it means that the gas cylinder structure meets the requirements of random vibration fatigue strength.

[0093] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An automatic fire extinguishing system for high-altitude AC electric locomotives, characterized in that, The device includes a first fire extinguishing component (100), a second fire extinguishing component (200), and a control component (300). The first fire extinguishing component (100) includes a first gas cylinder (110) and a first nozzle (120). The second fire extinguishing component (200) includes a second gas cylinder (210) and a second nozzle (220). The control component (300) includes a first normally open solenoid valve (310), a first normally closed solenoid valve (320), a second normally open solenoid valve (330), a second normally closed solenoid valve (340), and a controller. The first gas cylinder (110) and the first nozzle (120) are used to be installed near the traction converter cabinet (10). The first gas cylinder (110) is connected to the first nozzle (120) through the first normally open solenoid valve (310) and to the common pipeline through the first normally closed solenoid valve (320). The second gas cylinder (210) and the second nozzle (220) are used to be installed near the power battery cabinet (20). The second gas cylinder (210) is connected to the second nozzle (220) through the second normally open solenoid valve (330) and to the common pipeline through the second normally closed solenoid valve (340). The controller is electrically connected to the first gas cylinder (110), the second gas cylinder (210), the first normally open solenoid valve (310), the first normally closed solenoid valve (320), the second normally open solenoid valve (330), and the second normally closed solenoid valve (340), respectively, and is used to control the first gas cylinder (110) and / or the second gas cylinder (210) to spray the extinguishing medium.

2. The automatic fire extinguishing system for high-altitude AC electric locomotives according to claim 1, characterized in that, When the controller opens the first gas cylinder (110) or the second gas cylinder (210) and detects that the pressure in the corresponding pipeline is less than the lower pressure limit, the controller then controls the next first gas cylinder (110) or the next second gas cylinder (210) to open.

3. The automatic fire extinguishing system for high-altitude AC electric locomotives according to claim 1, characterized in that, The first gas cylinder (110) is connected to the first normally open solenoid valve (310) and the first normally closed solenoid valve (320) after passing through the first one-way valve; And / or, the second gas cylinder (210) is connected to the second normally open solenoid valve (330) and the second normally closed solenoid valve (340) respectively via the second one-way valve.

4. The automatic fire extinguishing system for high-altitude AC electric locomotives according to claim 1, characterized in that, Also includes: An environmental monitoring component (400) includes a first environmental monitoring component (410) and a second environmental monitoring component (420). The first environmental detection component (410) is used to detect the environmental parameters of the traction converter cabinet (10), and the second environmental detection component (420) is used to detect the environmental parameters of the power battery cabinet (20). The controller compares the environmental parameters with the corresponding thresholds. If the parameters exceed the thresholds, a fire warning or alarm message is triggered.

5. The automatic fire extinguishing system for high-altitude AC electric locomotives according to claim 4, characterized in that, The environmental parameters of the traction converter cabinet (10) include at least one of the following: first ambient temperature, first smoke concentration, and busbar temperature; And / or, the environmental parameters of the power battery cabinet (20) include at least one of a second ambient temperature and a second smoke concentration.

6. The automatic fire extinguishing system for high-altitude AC electric locomotives according to claim 5, characterized in that, The thresholds include a first ambient temperature lower limit threshold, a busbar temperature lower limit threshold, a first smoke concentration threshold, a second ambient temperature lower limit threshold, and a second smoke concentration threshold; When the first ambient temperature exceeds the lower limit threshold of the first ambient temperature, or when the first smoke concentration exceeds the first smoke concentration threshold, or when the busbar temperature exceeds the lower limit threshold of the busbar temperature, the controller triggers the fire warning information of the traction converter cabinet (10); And / or, when the second ambient temperature exceeds the lower limit threshold of the second ambient temperature, or when the second smoke concentration exceeds the second smoke concentration threshold, the controller triggers a fire warning message for the power battery cabinet (20).

7. The automatic fire extinguishing system for high-altitude AC electric locomotives according to claim 6, characterized in that, The threshold also includes a first upper limit threshold for ambient temperature, a first temperature rise rate threshold, a second upper limit threshold for ambient temperature, and a second temperature rise rate threshold. When the first ambient temperature exceeds the first ambient temperature upper limit threshold, or when the first smoke concentration exceeds the first smoke concentration threshold and the temperature rise rate of the first ambient temperature exceeds the first temperature rise rate threshold, or when the busbar temperature exceeds the busbar temperature upper limit threshold, the controller triggers the fire alarm information of the traction converter cabinet (10). And / or, when the second ambient temperature exceeds the second ambient temperature upper limit threshold, or when the second smoke concentration exceeds the second smoke concentration threshold and the temperature rise rate of the second ambient temperature exceeds the second temperature rise rate threshold, the controller triggers a fire alarm message for the power battery cabinet (20).

8. The automatic fire extinguishing system for high-altitude AC electric locomotives according to any one of claims 1 to 7, characterized in that, Also includes: The fault detection device is electrically connected to the controller and is used to detect fault information in the traction converter cabinet (10) or the power battery cabinet (20).

9. A method for calculating the dosage of fire extinguishing agent, characterized in that, The method for calculating the usage of the first gas cylinder (110) and the second gas cylinder (210) in the automatic fire extinguishing system for high-altitude AC electric locomotives as described in any one of claims 1 to 8 includes: Determine the type and design concentration of the extinguishing agent, and calculate the amount of extinguishing agent to be used; wherein the amount of extinguishing agent used includes the design amount, pipeline loss amount, and residual amount in the cylinder.

10. A method for evaluating the fatigue strength of a gas cylinder, characterized in that, The method for evaluating the fatigue strength of the first gas cylinder (110) and the second gas cylinder (210) in the automatic fire extinguishing system for high-altitude AC electric locomotives as described in any one of claims 1 to 8 includes: Determine the type of masterbatch for the gas cylinder and the corresponding fatigue grade curve, design the fatigue damage calculation formula, and analyze the fatigue load conditions. The fatigue strength of the base material is evaluated to determine whether the long-life random vibration condition meets the requirements, and the fatigue strength under random vibration is evaluated.

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