Fire gun head voltage acquisition method and system when the fire gun is used to extinguish fire on live equipment

Abstract

The application discloses a method and system for obtaining the voltage of a fire gun head when the fire gun is used to extinguish a live equipment, and belongs to the technical field of fire safety. The method for obtaining the voltage of the fire gun head when the fire gun is used to extinguish the live equipment comprises the following steps: S1, obtaining the following basic data: the spraying angle of the fire gun, the position coordinates of the fire gun, and the position coordinates of the live equipment; S2, calculating the length L of the spraying water column track of the fire gun according to a motion track expression; S3, calculating the resistance value R of the unit length water column according to the flow Q of the fire gun L ; and S4, obtaining the voltage U of the fire gun head. The voltage of the fire gun head is calculated according to the flow of the fire gun, the spraying angle of the fire gun, the coordinates of the fire gun and the live equipment, and the voltage of the live equipment, and technical support can be provided for the fire rescue personnel using the fire gun to extinguish the live equipment.

Description

Technical Field

[0001] This invention belongs to the field of fire safety technology, and in particular relates to a method and system for obtaining the voltage of the nozzle when a fire hose is used to extinguish fires on live equipment. Background Technology

[0002] Water is the most commonly used extinguishing agent in fire rescue. Because water conducts electricity, electrical equipment must generally be disconnected when using water to extinguish fires involving live electrical equipment to prevent injury to personnel. However, in special circumstances, it may be impossible to disconnect the power supply. During firefighting while the equipment is energized, an electrical circuit can be formed between the firefighters, the water, the energized equipment, and the ground. A current of 1mA in this circuit can cause an electric shock sensation, 5mA can cause pain, 10mA can cause unbearable pain, 20mA can cause incapacitation, and 100mA can be fatal. Currently, the following methods are used to prevent electric shock to firefighters during firefighting in energized environments: adjusting the water flow rate and discharging residual current. Adjusting the water flow rate increases the spray pressure and reduces the gaps between molecules, making it easier for electrons to pass through water molecules, resulting in a decrease in electrical resistance. Discharging residual current typically involves connecting the metal part of the nozzle to the ground, allowing the residual current to flow to the earth. The current conduction method severely limits the effectiveness of water spraying for fire extinguishing. While adjusting the water flow rate can effectively adjust the resistance, there is currently only a qualitative description and it is impossible to calculate the water nozzle voltage based on parameters such as water flow rate. This cannot meet the need to adjust the water flow rate accordingly when continuously adjusting the fire extinguishing distance during live fire extinguishing. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method and system for early fire detection and warning based on the power generation characteristics of photovoltaic modules. The voltage of the fire nozzle is calculated based on parameters such as fire hose flow rate, fire hose spray angle, fire hose coordinates, coordinates of energized equipment, and voltage of energized equipment, providing technical support for firefighters to use fire hoses to extinguish fires while the equipment is energized.

[0004] The specific technical solution adopted in this invention is as follows:

[0005] The primary objective of this patent is to provide a method for obtaining the nozzle voltage when a fire hose is used to extinguish fires on energized equipment, including:

[0006] S1. Obtain the following basic data: water gun spray angle, water gun position coordinates, and electrical equipment position coordinates; the expression for the water jet's trajectory during water gun spraying is:

[0007] ;

[0008] Where: (x1, y1) are the coordinates of the water gun position, x1 represents the horizontal coordinate of the water gun, and y1 represents the vertical coordinate of the water gun; θ is the water gun spray angle; (x2, y2) are the coordinates of the electrical equipment position, x2 represents the horizontal coordinate of the electrical equipment, x2-x1 is the horizontal distance from the water gun to the electrical equipment, and y2 represents the vertical coordinate of the electrical equipment.

[0009] S2. Calculate the length L of the water jet trajectory based on the aforementioned motion trajectory expression. The calculation formula is as follows:

[0010] ;

[0011] S3. Calculate the resistance value R of the water column per unit length based on the water jet flow rate Q. L When Q is in the range of 5–15 m³ / h, the calculation formula is as follows:

[0012] ;

[0013] S4. Obtain the voltage U at the water gun nozzle. The calculation formula is as follows:

[0014] ;

[0015] Among them: U T R is the voltage of the electrical equipment. H It is the electrical resistance of the human body.

[0016] Preferably, the human body resistance ranges from 1800 to 2500 Ω.

[0017] A second objective of this invention is to provide a system for acquiring the nozzle voltage when a fire hose is used to extinguish fires on energized equipment, comprising:

[0018] Data acquisition module: Acquires the following basic data: water gun spray angle, water gun position coordinates, and electrical equipment position coordinates; the trajectory expression of the water column during water gun spraying is:

[0019] ;

[0020] Where: (x1, y1) are the coordinates of the water gun position, x1 represents the horizontal coordinate of the water gun, and y1 represents the vertical coordinate of the water gun; θ is the water gun spray angle; (x2, y2) are the coordinates of the electrical equipment position, x2 represents the horizontal coordinate of the electrical equipment, x2-x1 is the horizontal distance from the water gun to the electrical equipment, and y2 represents the vertical coordinate of the electrical equipment.

[0021] First calculation module: Calculates the length L of the water jet trajectory based on the motion trajectory expression, using the following formula:

[0022] ;

[0023] Second calculation module: Calculates the resistance value R of the water column per unit length based on the water jet flow rate Q. L When Q is in the range of 5–15 m³ / h, the calculation formula is as follows:

[0024] ;

[0025] Result output module: Obtains the water gun head voltage U, calculated using the following formula:

[0026] ;

[0027] Among them: U T R is the voltage of the electrical equipment. H It is the electrical resistance of the human body.

[0028] Preferably, the data acquisition module includes:

[0029] An angle sensor to acquire the water gun spray angle;

[0030] The first position sensor acquires the coordinates of the water gun's position.

[0031] The second position sensor acquires the position coordinates of the energized equipment.

[0032] Preferably, the result output module includes a human-computer interaction module for displaying the water gun head voltage U.

[0033] A third objective of this invention is to provide a water gun fire extinguishing system, including the aforementioned fire gun head voltage acquisition system when extinguishing fires with electrical equipment.

[0034] The fourth objective of this patent is to provide a computer program for obtaining the nozzle voltage when the fire hose is used to extinguish fires on electrical equipment.

[0035] The fifth objective of this patent is to provide an information data processing terminal that implements the above-mentioned method for obtaining the nozzle voltage when a fire hose extinguishes fire on energized equipment.

[0036] The sixth objective of this patent is to provide a computer-readable storage medium, including instructions that, when executed on a computer, cause the computer to perform the aforementioned method for obtaining the nozzle voltage when a fire hose extinguishes a fire on energized equipment.

[0037] The advantages and positive effects of this invention are as follows:

[0038] By adopting the above technical solution, the present invention has the following technical effects:

[0039] This invention can calculate the voltage of the fire hose nozzle based on parameters such as fire hose flow rate, water hose spray angle, water hose coordinates, coordinates of energized equipment, and voltage of energized equipment. When firefighters are extinguishing fires involving energized equipment, they can calculate the fire hose nozzle voltage according to the scheme provided in this application. When the nozzle voltage or current exceeds the safety limit, the voltage or current can be reduced by adjusting the water hose flow rate, water hose spray angle, and spray distance, thereby minimizing the risk of electric shock to firefighters while maintaining firefighting and rescue efficiency. Attached Figure Description

[0040] Figure 1 A flowchart of a preferred embodiment of the present invention;

[0041] Figure 2 This is a system block diagram in a preferred embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the test platform in a preferred embodiment of the present invention;

[0043] Figure 4 This is a comparison of experimental and calculated data on the water gun head voltage in a preferred embodiment of the present invention. Detailed Implementation

[0044] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0045] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0046] Please see Figure 1 A method for obtaining the nozzle voltage when a fire hose is used to extinguish fires on energized equipment, comprising:

[0047] S1. Obtain the following basic data: water gun spray angle, water gun position coordinates, and electrical equipment position coordinates; the expression for the water jet's trajectory during water gun spraying is:

[0048] ;

[0049] Where: (x1, y1) are the coordinates of the water gun position, x1 represents the horizontal coordinate of the water gun, and y1 represents the vertical coordinate of the water gun; θ is the water gun spray angle, in rad; (x2, y2) are the coordinates of the live equipment position, x2 represents the horizontal coordinate of the live equipment, x2-x1 is the horizontal distance from the water gun to the live equipment, and y2 represents the vertical coordinate of the live equipment;

[0050] S2. Calculate the length L of the water jet trajectory based on the aforementioned motion trajectory expression. The calculation formula is as follows:

[0051] ;

[0052] Where L is the length of the water jet trajectory from the water gun, in meters.

[0053] S3. Calculate the resistance value R of the water column per unit length based on the water jet flow rate Q. L When Q is in the range of 5–15 m³ / h, the calculation formula is as follows:

[0054] ;

[0055] Among them, R L Q is the resistance value per unit length of water column, in Ω / m; Q is the water jet flow rate, in m³ / h.

[0056] S4. Obtain the voltage U at the water gun nozzle. The calculation formula is as follows:

[0057] ;

[0058] Where: U is the voltage of the water gun nozzle, unit: V; U T Voltage of live equipment, unit: V; R H The resistance of the human body is measured in Ω, and its typical value is between 1800 and 2500Ω.

[0059] To verify the effectiveness of the method for calculating the voltage of the water gun nozzle, a system was built as follows: Figure 3 The electrical equipment energized firefighting test platform shown includes an operating console 1, a fire hydrant 2, a pipeline pump 3, a frequency converter 4, a fire hose nozzle 5, an electrified metal plate 6, and a 1000V DC power supply 7. The fire hose nozzle has a diameter of 2cm, an angle of 35° to the ground, a height of 0.88m, and a flow rate of 12m³ / h. During the experiment, water is sprayed from the fire hose nozzle onto the electrified metal plate at a height of 1.05m. A voltage transmitter is connected to the metal part of the fire hose nozzle to test the nozzle head voltage. The experiment tested the nozzle head voltage at distances of 5m, 10m, and 15m from the electrified metal plate. The DC voltage of the electrified metal plate was set to 400–1000V, with each test run at 50V intervals. The experimental results are shown in the comparison graph below. Figure 4 As shown.

[0060] Please see Figure 2 A system for obtaining the nozzle voltage when a fire hose extinguishes a fire on energized equipment, comprising:

[0061] Data acquisition module: Acquires the following basic data: water gun spray angle, water gun position coordinates, and electrical equipment position coordinates; the trajectory expression of the water column during water gun spraying is:

[0062] ;

[0063] Where: (x1, y1) are the coordinates of the water gun position, x1 represents the horizontal coordinate of the water gun, and y1 represents the vertical coordinate of the water gun; θ is the water gun spray angle; (x2, y2) are the coordinates of the electrical equipment position, x2 represents the horizontal coordinate of the electrical equipment, x2-x1 is the horizontal distance from the water gun to the electrical equipment, and y2 represents the vertical coordinate of the electrical equipment.

[0064] First calculation module: Calculates the length L of the water jet trajectory based on the motion trajectory expression, using the following formula:

[0065] ;

[0066] Second calculation module: Calculates the resistance value R of the water column per unit length based on the water jet flow rate Q. L When Q is in the range of 5–15 m³ / h, the calculation formula is as follows:

[0067] ;

[0068] Result output module: Obtains the water gun head voltage U, calculated using the following formula:

[0069] ;

[0070] Among them: U T R is the voltage of the electrical equipment. H It is the electrical resistance of the human body.

[0071] The data acquisition module includes:

[0072] An angle sensor to acquire the water gun spray angle;

[0073] The first position sensor acquires the coordinates of the water gun's position.

[0074] The second position sensor acquires the position coordinates of the energized equipment.

[0075] The result output module includes a human-computer interaction module for displaying the water gun head voltage U.

[0076] A water-fire extinguishing system includes a nozzle voltage acquisition system for extinguishing fires with the aforementioned fire hoses on energized equipment.

[0077] A computer program for implementing the method of obtaining the nozzle voltage when a fire hose extinguishes fire on energized equipment in the preferred embodiment described above.

[0078] An information data processing terminal that implements the method for obtaining the nozzle voltage when a fire hose extinguishes fire on energized equipment in the preferred embodiment described above.

[0079] A computer-readable storage medium includes instructions that, when executed on a computer, cause the computer to perform the method for obtaining the nozzle voltage when a fire hose extinguishes a fire on energized equipment, as described in the preferred embodiment above.

[0080] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented, in whole or in part, as a computer program product, the computer program product includes one or more computer instructions. When the computer program instructions are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A method for obtaining the nozzle voltage when a fire hose is used to extinguish fires on energized equipment, characterized in that, include: S1. Obtain the following basic data: water gun spray angle, water gun position coordinates, and electrical equipment position coordinates; the expression for the water jet's trajectory during water gun spraying is: ； ； ； Where: (x1, y1) are the coordinates of the water gun position, x1 represents the horizontal coordinate of the water gun, and y1 represents the vertical coordinate of the water gun; θ is the water gun spray angle; (x2, y2) are the coordinates of the electrical equipment position, x2 represents the horizontal coordinate of the electrical equipment, x2-x1 is the horizontal distance from the water gun to the electrical equipment, and y2 represents the vertical coordinate of the electrical equipment. S2. Calculate the length L of the water jet trajectory based on the aforementioned motion trajectory expression. The calculation formula is as follows: ； S3. Calculate the resistance value R of the water column per unit length based on the water jet flow rate Q. L When Q is in the range of 5–15 m³ / h, the calculation formula is as follows: ； S4. Obtain the voltage U at the water gun nozzle. The calculation formula is as follows: ； Among them: U T R is the voltage of the electrical equipment. H It is the electrical resistance of the human body.

2. The method for obtaining the nozzle voltage when a fire hose is used to extinguish fires on energized equipment according to claim 1, characterized in that, The range of human body resistance is 1800~2500Ω.

3. A system for acquiring the nozzle voltage when a fire hose extinguishes fire on energized equipment, characterized in that, include: Data acquisition module: Acquires the following basic data: water gun spray angle, water gun position coordinates, and electrical equipment position coordinates; the trajectory expression of the water column during water gun spraying is: ； ； ； Where: (x1, y1) are the coordinates of the water gun position, x1 represents the horizontal coordinate of the water gun, and y1 represents the vertical coordinate of the water gun; θ is the water gun spray angle; (x2, y2) are the coordinates of the electrical equipment position, x2 represents the horizontal coordinate of the electrical equipment, x2-x1 is the horizontal distance from the water gun to the electrical equipment, and y2 represents the vertical coordinate of the electrical equipment. First calculation module: Calculates the length L of the water jet trajectory based on the aforementioned motion trajectory expression. The calculation formula is as follows: ； Second calculation module: Calculates the resistance value R of the water column per unit length based on the water jet flow rate Q. L When Q is in the range of 5–15 m³ / h, the calculation formula is as follows: ； Result output module: Obtains the water gun head voltage U, calculated using the following formula: ； Among them: U T R is the voltage of the electrical equipment. H It is the electrical resistance of the human body.

4. The fire nozzle voltage acquisition system according to claim 3 for extinguishing fires with live electrical equipment, characterized in that, The data acquisition module includes: An angle sensor to acquire the water gun spray angle; The first position sensor acquires the coordinates of the water gun's position. The second position sensor acquires the position coordinates of the energized equipment.

5. The fire nozzle voltage acquisition system according to claim 3 for extinguishing fires with live electrical equipment, characterized in that, The result output module includes a human-computer interaction module for displaying the water gun head voltage U.

6. A water gun fire extinguishing system, characterized in that, The system includes the nozzle voltage acquisition system for fire hoses used to extinguish fires on live equipment, as described in any one of claims 3-5.

7. An information data processing terminal that implements the method for obtaining the nozzle voltage when a fire hose is used to extinguish fires on live equipment as described in claim 1 or 2.

8. A computer-readable storage medium comprising instructions, when executed on a computer, causing the computer to perform the method for obtaining the nozzle voltage when a fire hose extinguishes a fire on energized equipment as described in claim 1 or 2.

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