A two-phase flow vehicle-mounted fire extinguishing device based on acoustic wave driving

Abstract

The application discloses a kind of two-phase flow vehicle-mounted fire extinguishing device based on acoustic wave driving, including vehicle body and being placed in two-phase flow supply device, acoustic wave generating device and vortex ring generating device in vehicle body, two-phase flow supply device includes liquid nitrogen supply device and water supply device, liquid nitrogen supply device includes liquid nitrogen storage tank and air temperature type vaporization device.Acoustic wave generating device includes waveform generator, power amplifier and parallel acoustic wave speaker, inner wall acoustic wave speaker.Vortex ring generating device includes cylinder, cylinder includes cylinder I and cylinder II, cylinder I diameter is less than cylinder II, cylinder I one end is equipped with outlet I, its outlet is located in cylinder II, outlet II is equipped on cylinder II.Cylinder I outlet opposite side is installed on parallel acoustic wave speaker.In the inner wall of cylinder I and cylinder II, multiple two-phase flow nozzles and inner wall acoustic wave speakers are uniformly distributed, and the two-phase flow nozzles are arranged at intervals with the inner wall acoustic wave speakers.The device can link acoustic wave and vortex ring, so as to realize long-distance fire extinguishing.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology, specifically to a two-phase flow vehicle-mounted device and method based on acoustic wave drive. Background Technology

[0002] Traditional fire extinguishing methods have a short extinguishing distance and cannot extinguish fires at a distance (over 100 meters). Some equipment that can extinguish fires at a distance (over 100 meters) is often large and heavy, inconvenient to move, consumes a lot of energy, requires a lot of water resources, and loses a lot of water during the spraying process, resulting in unnecessary costs. The fire extinguishing efficiency is low, and it can also cause some damage to facilities around the fire point and produce a lot of toxic and harmful gases.

[0003] When using sound waves alone for fire extinguishing, it often requires a confined space or the placement of a baffle near the fire source to reflect the sound waves. In practical applications, fire extinguishing usually needs to be carried out in open spaces, where sound waves alone are ineffective. Furthermore, sound extinguishing cannot effectively cool the fire source; if the burning material is not cooled in time, reignition may occur. Summary of the Invention

[0004] The purpose of this invention is to provide a two-phase flow vehicle-mounted device based on acoustic wave drive, which can achieve long-distance fire extinguishing through the linkage of acoustic waves and eddy currents.

[0005] To achieve the above objectives, the present invention provides a vehicle-mounted fire extinguishing device based on acoustic wave-driven two-phase flow, comprising a vehicle body and a two-phase flow supply device, an acoustic wave generator, and a vortex ring generator placed within the vehicle body, wherein...

[0006] The two-phase flow supply device includes a liquid nitrogen supply device and a fine water mist supply device. The liquid nitrogen supply device includes a liquid nitrogen storage tank and an ambient temperature vaporization device connected by pipelines. The fine water mist supply device includes a water tank. The ambient temperature vaporization device and the water tank pipeline are combined and connected to the vortex ring generator.

[0007] The acoustic wave generating device includes a waveform generator and a power amplifier connected by lines;

[0008] The vortex ring generator includes a cylinder, a loudspeaker, and a two-phase flow nozzle. The loudspeaker includes an inner wall acoustic wave loudspeaker and a parallel acoustic wave loudspeaker. The loudspeaker is electrically connected to the power amplifier. The two-phase flow nozzle is connected to the combined pipeline of the air-temperature vaporization device and the water tank. The parallel acoustic wave loudspeaker is installed on the inner side of the rear end of the cylinder. The two-phase flow nozzle and the inner wall acoustic wave loudspeaker are evenly distributed on the inner wall of the cylinder, and the two-phase flow nozzle and the inner wall acoustic wave loudspeaker are spaced apart.

[0009] Furthermore, the two-phase flow supply device also includes a pressurizing device, which provides pressure to the liquid nitrogen supply device and the fine water mist supply device.

[0010] Furthermore, the cylinder includes cylinder I and cylinder II. The diameter of cylinder I is smaller than that of cylinder II. One end of cylinder I is provided with outlet I, which is located inside cylinder II. Cylinder II is provided with outlet II, which is located directly in front of outlet I.

[0011] Furthermore, the direction of the two-phase flow nozzle and the direction of the inner wall acoustic speaker are directed toward the outlet of the cylinder I, forming a certain angle with the central axis of the cylinder I, less than 45 degrees.

[0012] Furthermore, the water in the tank or a mixture of water and flame retardant.

[0013] Furthermore, the diameter of the sound wave emitted by the parallel acoustic loudspeaker is smaller than the diameter of the vortex ring, allowing it to pass through the middle of the vortex ring and provide a certain tangential force to the inner sidewall of the vortex ring, thereby improving the stability of the vortex ring rotation and the flight distance.

[0014] Furthermore, both the inner wall acoustic speaker and the parallel acoustic speaker are partially embedded in the inner wall of the cylinder.

[0015] Furthermore, a foldable fan is provided at the front of the outlet of the cylinder II.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) Two-phase vortex rings are formed by sound waves. Compared with the traditional method of forming vortex rings by the mechanical movement of a pusher plate, the equipment that produces vortex rings by sound waves simplifies the overall mechanical structure of the equipment, making the equipment smaller and lighter; and the vortex rings generated by sound waves have a longer formation distance, covering the entire vortex ring cylinder, so the vortex rings are more stable and can transmit over a longer distance; at the same time, a parallel sound wave generator is installed at the end of the cylinder to emit parallel sound waves with a diameter smaller than the inner diameter of the vortex ring, providing a certain tangential force to the inner side of the vortex ring, increasing the speed of the vortex ring's internal rotation, thereby improving the stability of the vortex ring and the transmission distance;

[0018] (2) Effectively linking sound wave fire extinguishing with vortex ring fire extinguishing can suppress and extinguish fires at a distance. By disturbing fires at a distance with sound waves, the flames are made to deviate from the burning object and expose the surface of the burning object. Then, the vortex ring delivers fine water mist and nitrogen to the fire location, directly cooling the burning fuel and isolating it from the air, thereby suppressing and extinguishing the fire.

[0019] (3) By designing the cylinder as a first cylinder and a second cylinder, the mixing of outside air during the formation of the vortex ring is reduced, and the concentration of nitrogen and fine water mist in the vortex ring is increased, thereby improving the fire extinguishing capability of the vortex ring. At the same time, the stability of the vortex ring is improved, enabling it to be delivered to farther locations;

[0020] (4) Nitrogen gas and fine water mist work together to extinguish fire. Compared with other fire extinguishing media, it can quickly absorb the heat generated by the fire source, effectively reduce the temperature of the fire source, and isolate oxygen, thereby inhibiting the fire from continuing to occur. Moreover, it will not cause additional damage to the equipment and is green and environmentally friendly.

[0021] (5) By controlling the foldable fan, the vortex ring generator has two modes: one is to extinguish fire at a distance by emitting sound waves and two-phase vortex rings, and the other is to realize the function of a sprayer by using the fan and gas-liquid two-phase flow nozzles, which can remove dust, cool down and extinguish fire at close range. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a vehicle-mounted fire extinguishing device that combines a two-phase vortex ring with acoustic wave linkage.

[0023] Figure 2 This is a schematic diagram of a vortex ring generator;

[0024] In the diagram, 1-vehicle body; 2-pressurization device; 3-water tank; 4-liquid nitrogen storage tank; 5-liquid nitrogen valve; 6-liquid nitrogen flow meter; 7-ambient vaporization device; 8-water flow valve; 9-water flow meter; 10-waveform generator; 11-power amplifier; 12-main power supply; 13-vortex ring generator; 14-vortex ring generator bracket; 15-liquid nitrogen pressurization pipeline; 16-water pressurization pipeline; 17-nitrogen pipeline; 18-water flow pipeline; 19-first cylinder; 20-second cylinder; 21-inner wall acoustic speaker; 22-parallel acoustic speaker; 23-two-phase flow nozzle; 24-folding fan; 25-vortex ring. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 and Figure 2 As shown, a vehicle-mounted fire extinguishing device based on acoustic wave drive includes a vehicle body 1 and a two-phase flow supply device, an acoustic wave generator, and a vortex ring generator 13 placed inside the vehicle body. The vehicle body 1 is divided into upper and lower layers. The lower layer houses the two-phase flow supply device and the acoustic wave generator, while the upper layer houses the vortex ring generator 13. The vortex ring generator 13 is mounted on the vehicle body 1 via a vortex ring generator bracket 14. Four casters are provided at the bottom of the vehicle body 1 for easy movement.

[0027] The two-phase flow supply device includes a liquid nitrogen supply device and a fine water mist supply device. The liquid nitrogen supply device includes a liquid nitrogen storage tank 4 and an ambient temperature vaporization device 7. The liquid nitrogen storage tank 4 is connected to the ambient temperature vaporization device 7 via pipeline. The fine water mist supply device includes a water tank 3. Both the ambient temperature vaporization device 7 and the water tank 3 are connected to the vortex generator 13 via pipeline. Liquid nitrogen, after vaporization, can provide nitrogen gas for fire extinguishing. The water inside the water supply device can be water or a mixture of water and flame retardant. The two-phase flow supply device also includes a pressurizing device 2, which provides pressure to the liquid nitrogen supply device and the fine water mist supply device. The pressurizing pressure is a low pressure of 0.5 MPa. Specifically, the pressurizing device 2 provides pressure to the liquid nitrogen storage tank 4 through a liquid nitrogen pressurizing pipeline 17 and to the water tank 3 through a water pressurizing pipeline 16. A liquid nitrogen valve 5 and a liquid nitrogen flow meter 6 are installed on the connecting pipeline above the liquid nitrogen storage tank 4. A water flow valve 8 and a water flow meter 9 are connected to the pipeline above the water tank 3.

[0028] The liquid nitrogen is vaporized to a temperature above 0 degrees Celsius by the ambient temperature vaporization device 7. The control method is as follows: the flow rate of liquid nitrogen is controlled by the valve of the pipeline between the nitrogen storage tank 4 and the ambient temperature vaporization device 7, so as to control the vaporization rate of liquid nitrogen and thus control the temperature of nitrogen.

[0029] The sound wave generating device includes a waveform generator 10 and a power amplifier 11 connected in sequence. A main power supply 12 is provided on the power amplifier 11 to provide power to the entire device. The sound waves emitted by the sound wave generating device are in the range of 30-60 Hz, which can be used for fire extinguishing.

[0030] The vortex ring generator includes a cylinder, a two-phase flow nozzle 23, and a loudspeaker. The cylinder is cylindrical and includes cylinder I 19 and cylinder II 20. The diameter of cylinder I 19 is smaller than that of cylinder II 20. One end of cylinder I 19 is provided with outlet I, which is located inside cylinder II 20. On cylinder II 20, there is outlet II, which is located directly in front of outlet I. Both outlet I and outlet II are tapered, that is, their diameters are slightly smaller than the diameters of the corresponding cylinders, and the diameter of outlet II is larger than the diameter of outlet I.

[0031] The loudspeakers include an inner wall acoustic wave loudspeaker 21 and a parallel acoustic wave loudspeaker 22, with the parallel acoustic wave loudspeaker 22 mounted on the side opposite the outlet of cylinder I19. Multiple two-phase flow nozzles 23 and inner wall acoustic wave loudspeakers 21 are evenly distributed on the inner walls of cylinder I19 and cylinder II20, with the two-phase flow nozzles 23 and inner wall acoustic wave loudspeakers 21 spaced apart. The nozzles of the gas-liquid two-phase flow nozzles 23 face towards the outlet of cylinder I19, forming an angle less than 45 degrees with the axis. The inner wall acoustic wave loudspeakers 21 emit sound waves sequentially from the rear of cylinder I19 to the outlet of cylinder II20. Through the sound pressure of the sound waves and their influence on airflow, a vortex ring is formed inside the cylinder cavity. Specifically, both the inner wall acoustic wave loudspeaker 21 and the parallel acoustic wave loudspeaker 22 are partially embedded in the inner wall of the cylinder. Specifically, a foldable fan 24 is provided at the front of the outlet of cylinder II20.

[0032] The working principle of this device is as follows: A gas-liquid mixture of nitrogen and fine water mist, supplied by a two-phase flow supply device, is delivered to the vortex ring generator. This mixture is then ejected into the spaces within cylinders I19 and II20 via two-phase flow nozzles 23, forming the nitrogen and water mist mixture. Sound waves are then emitted by a parallel sound wave loudspeaker 23 and an inner wall sound wave emitter, causing the mixture to form a vortex ring. The sound waves propel the vortex ring out of the outlet of cylinder II20. Sound waves are mechanical pressure waves that cause vibrations in the medium in which they propagate, thus applying pressure to the gas. In this device, loudspeakers mounted on the cylinder wall emit sound waves sequentially from the rear of the cylinder to the outlet. These, combined with parallel sound wave emitters at the bottom of the cylinder, push the gas inside the cylinder towards the outlet, creating an airflow. As the gas inside the cylinder moves towards the outlet, the inner wall of the cylinder exerts friction on the gas near the inner wall, creating an axial velocity gradient, with the fastest velocity at the axis of rotation. Simultaneously, because the diameter of the parallel sound wave is smaller than the inner diameter of the vortex ring, after the vortex ring initially forms inside the cylinder, the parallel sound wave can pass through the center of the vortex ring, exerting a tangential force on its inner diameter, further increasing the velocity gradient and thus forming the vortex ring, improving stability and the maximum emission distance. The existence of the axial velocity gradient drives the airflow to separate, coil, and swirl, ultimately forming a single vortex ring, such as... Figure 2 As shown. When in use, the outlet of cylinder II20 faces the direction of the fire. Combining sound waves, nitrogen, and water to extinguish the fire is more effective than any single method. Parallel sound waves primarily act as a propulsion force in the early stages of vortex ring formation, and primarily increase tangential force in the later stages.

[0033] Regarding cylinders I19 and II20, the vortex ring initially forms within cylinder I19, where the airflow stability is relatively poor. If the vortex ring directly enters the open space from cylinder I19 at this stage, it will lead to a significant amount of external gas being entrained into the vortex ring, resulting in a decrease in the concentration of fine water mist and nitrogen within the two-phase flow vortex ring, thus reducing its fire extinguishing capability. Connecting cylinder II20 externally at the outlet of cylinder I19 increases the distance the initially formed vortex ring travels within the cylinder, improving the stability of the vortex ring's airflow, reducing the entrainment of external gas, increasing the content of fine water mist and nitrogen, and ultimately improving fire extinguishing efficiency.

[0034] In addition, a foldable fan 24 is added to the front of the cylinder II. The purpose of this fan is to target the fire point at close range, disperse the vortex, and make the nitrogen and water mixture form a diffused mist, which can expand the fire extinguishing area and improve the fire extinguishing efficiency. When it is necessary to extinguish a fire at close range, or to cool or remove dust from the surrounding environment at close range, the sound wave supply device is turned off to stop the generation of the vortex ring. The two-phase flow supply device continues to operate, so that the environment of nitrogen and fine water mist mixture is still maintained inside the cylinder. At this time, the fan is turned on. The operation of the fan will create a negative pressure inside the cylinder, and the nitrogen and fine water mist mixture will form a diffused mist under the action of the fan.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A vehicle-mounted fire extinguishing device based on acoustic wave-driven two-phase flow, characterized in that, The device includes a vehicle body (1) and a two-phase flow supply device, a sound wave generator and a vortex ring generator (13) placed inside the vehicle body (1). The two-phase flow supply device includes a liquid nitrogen supply device and a fine water mist supply device. The liquid nitrogen supply device includes a liquid nitrogen storage tank (4) and an ambient temperature vaporization device (7) connected by pipelines. The fine water mist supply device includes a water tank (3). The pipelines of the ambient temperature vaporization device (7) and the water tank (3) are combined and connected to the vortex ring generator (13). The sound wave generating device includes a waveform generator (10) and a power amplifier (11) connected by lines; The vortex ring generator (13) includes a cylinder, a loudspeaker, and a two-phase flow nozzle (23). The loudspeaker includes an inner wall acoustic wave loudspeaker (21) and a parallel acoustic wave loudspeaker (22). The loudspeaker is electrically connected to the power amplifier (11). The two-phase flow nozzle (23) is connected to the combined pipeline of the air-temperature vaporization device (7) and the water tank (3). The parallel acoustic wave loudspeaker (22) is installed on the inner side of the rear end of the cylinder. The two-phase flow nozzle (23) and the inner wall acoustic wave loudspeaker (21) are evenly distributed on the inner wall of the cylinder. The two-phase flow nozzle (23) and the inner wall acoustic wave loudspeaker (21) are spaced apart. The cylinder includes cylinder I (19) and cylinder II (20). The diameter of cylinder I (19) is smaller than that of cylinder II (20). One end of cylinder I (19) is provided with outlet I, which is located inside cylinder II (20). Outlet II is provided on cylinder II (20), and outlet II is located directly in front of outlet I. The two-phase flow nozzle (23) and the inner wall acoustic speaker (21) are oriented toward the outlet of the cylinder I (19) and are at a certain angle to the central axis of the cylinder I (19), less than 45 degrees. The diameter of the sound wave emitted by the parallel acoustic loudspeaker (22) is smaller than that of the vortex ring, and it can pass through the middle of the vortex ring, providing a certain tangential force to the side wall of the inner vortex ring, thereby improving the stability of the vortex ring rotation and the flight distance. The inner wall acoustic loudspeaker (21) emits sound waves sequentially from the rear of cylinder I (19) to the outlet of cylinder II (20).

2. The vehicle-mounted fire extinguishing device based on acoustic wave drive according to claim 1, characterized in that, The two-phase flow supply device also includes a pressurizing device (2), which provides pressure to the liquid nitrogen supply device and the fine water mist supply device.

3. The vehicle-mounted fire extinguishing device based on acoustic wave drive according to claim 1, characterized in that, The water in the water tank (3) or a mixture of water and flame retardant.

4. The vehicle-mounted fire extinguishing device based on acoustic wave drive according to claim 1, characterized in that, Both the inner wall acoustic speaker (21) and the parallel acoustic speaker (22) are partially embedded in the inner wall of the cylinder.

5. A vehicle-mounted fire extinguishing device based on acoustic wave drive according to claim 1, characterized in that, A foldable fan (24) is provided at the front of the outlet of the cylinder II (20).

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