CN113318366B - A fire extinguishing device for water mist and sound field enhancement - Google Patents
A fire extinguishing device for water mist and sound field enhancement Download PDFInfo
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- CN113318366B CN113318366B CN202110661408.3A CN202110661408A CN113318366B CN 113318366 B CN113318366 B CN 113318366B CN 202110661408 A CN202110661408 A CN 202110661408A CN 113318366 B CN113318366 B CN 113318366B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/005—Delivery of fire-extinguishing material using nozzles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0072—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using sprayed or atomised water
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Abstract
本发明公开了一种针对细水雾外加声场强化的灭火装置，主要包括多个声源装置与细水雾喷嘴的空间布置以及声场的调控方案。单个声源装置包括信号发生器、功率放大器、扬声器及温度传感器。声场调控包括当温度传感器达到设定阈值时，使信号发生器输出30Hz～50Hz的正弦声波，并设置好相应的信号幅值，另外还需调节功率放大器的增益旋钮，使其尽可能地将信号放大。本发明可以用于细水雾灭火的场所，对细水雾雾场范围内无法有效熄灭的火焰，通过在其附近外加声场来将其快速熄灭。
The invention discloses a fire-extinguishing device aiming at water mist and sound field enhancement, which mainly includes the spatial arrangement of a plurality of sound source devices and water mist nozzles, and a sound field regulation scheme. A single sound source device includes a signal generator, a power amplifier, a speaker, and a temperature sensor. The sound field regulation includes when the temperature sensor reaches the set threshold, the signal generator outputs a 30Hz~50Hz sine wave, and the corresponding signal amplitude is set. In addition, the gain knob of the power amplifier needs to be adjusted to make the signal as much as possible enlarge. The invention can be used in places where water mist is used for fire extinguishing, and for flames that cannot be effectively extinguished within the range of the water mist mist field, it can be quickly extinguished by adding a sound field near it.
Description
Technical Field
The invention belongs to the field of water mist fire extinguishing and sound wave fire extinguishing, and particularly relates to a fire extinguishing device for strengthening a sound field applied to water mist.
Background
In recent years, various safety accidents caused by fire have been on the increasing trend year by year. The fire hazard not only harms the life and property safety of people, but also causes serious environmental pollution. How to rapidly and effectively prevent fire, eliminate fire and reduce social loss brought by fire to people becomes important in the urgent need of solving the problems in the current society. Halon fire extinguishing agents with high fire extinguishing efficiency are widely used, but are prohibited from being used globally in 2012 because of the damage to the ozone layer and the greenhouse effect. At present, all countries in the world are busy with researching and exploring a fire-fighting technology with high efficiency, safety, energy conservation and environmental protection.
The water mist fire extinguishing technology is proposed at the earliest in about 50 years of the 20 th century, and the water mist fire extinguishing technology is considered as the best Halon alternative fire extinguishing agent by developed countries. The existing research shows that the water mist fire extinguishing technology can be suitable for extinguishing various fires and is gradually applied to various scenes such as factories, parking lots, airplanes, ships, subways, tunnels, comprehensive pipe galleries and the like. In addition to the growing water mist technology, the use of acoustics is an active emerging field for the research of Halon alternative technology. Previous studies have shown that flames are susceptible to acoustic fields and that flame response behavior varies with the acoustic frequencies employed. Many studies have demonstrated that sound waves are an effective fire extinguishing agent, extinguishing solid, liquid and gaseous fires under certain conditions.
In fact, for pure water mist, the fire extinguishing effect is not high enough only by relying on physical action, so that the development of the fire extinguishing effect is limited to a certain extent. And flames in the range of the fine water mist field can not be extinguished effectively in time. Whereas according to the sound wave fire extinguishing related literature, considering the ratio of sound pressure and flame size, it is impractical from an engineering point of view to use only acoustics to suppress flames.
Disclosure of Invention
The invention aims to provide a fire extinguishing device for strengthening a fine water mist and an external sound field, aiming at overcoming the defects of the prior art, and further improving the fire extinguishing efficiency and range. The invention considers the combination of water mist and sound wave to extinguish fire, thereby improving the fire extinguishing efficiency and range; this combination not only does not pose negative problems to humans and the environment, but is particularly suitable for applications where there is a certain limit to the amount of water available.
The purpose of the invention is realized by the following technical scheme: a fire extinguishing device for strengthening a fine water mist and an additional sound field mainly comprises spatial arrangement of a plurality of sound source devices and fine water mist nozzles, a sound field regulation scheme and the like.
The sound source device comprises a signal generator, a power amplifier, a loudspeaker and a temperature sensor which are connected in sequence. The signal generator emits sound waves, and the sound waves are amplified by the power amplifier and then transmitted to the loudspeaker. The speaker surface is mounted with a temperature sensor.
Spatial arrangement of the sound source device and the fine water mist nozzle: four loudspeakers are arranged around each fine water spray nozzle, the fine water spray nozzle is taken as an origin, the positions of the four loudspeakers are respectively (a, b, c), (a, -b, c), (-a, -b, c), and specifically:
b＝0.5R
wherein a, b, c >0, which are distances in the direction of the xyz axis, respectively; theta is the taper angle of the water mist nozzle, and the spraying range of the water mist nozzle at the distance c in the z direction is a circle with the radius of R.
The sound field regulation and control comprises that when the temperature sensor reaches a set threshold value, the signal generator is used for generating low-frequency sound wave analog electric signals, outputting 30 Hz-50 Hz sinusoidal sound waves, setting the amplitude of the signals to be more than or equal to 2.2V, and adjusting a gain knob of the power amplifier to amplify the signals as much as possible.
Further, the signal amplitude of the signal generator is set to be within the range of 2.2-17.2V.
Further, the power amplifier is used to amplify the low frequency acoustic wave analog electrical signal to a certain extent, here realized by a gain button.
Further, the loudspeaker converts the amplified low-frequency sound wave analog electric signal into sound waves for playing.
Further, four speakers are arranged around each water mist nozzle and are placed facing the corresponding water mist nozzle along the x-axis direction.
Further, when the temperature sensor reaches a set threshold value, a gain knob of the power amplifier is adjusted to enable the sound pressure level at the fire source to be larger than or equal to 100 dB.
Furthermore, the switches of the plurality of sound source devices are controlled by respective temperature sensors, that is, when a temperature sensor on a certain speaker detects that the nearby temperature reaches a certain threshold, the speaker is turned on.
Furthermore, the fine water mist nozzle is a pressure type rotational flow atomizing nozzle.
Furthermore, the temperature sensor is arranged on one surface of the loudspeaker close to the fine water mist nozzle.
The invention has the beneficial effects that: for places where the water mist is used for extinguishing fire, a plurality of loudspeakers and temperature sensors are installed, and when the temperature near a certain loudspeaker reaches a certain threshold value, the loudspeakers are turned on, so that flames which cannot be effectively extinguished only by the water mist are quickly extinguished under the combined action of a sound field and a water mist nozzle. Wherein the lower frequency sound waves can extinguish the flame faster and more reliably; when the signal amplitude changes, the difference between the fire extinguishing time and the reliability is not large.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a diagram showing the relationship between the amplitude of the signal from the signal generator and the extinguishing time;
in the figure, 1. a signal generator; 2. a power amplifier; 3. a speaker; 4. an alcohol lamp; 5. a lamp wick; 6. a flame; 7. a fine water mist nozzle; 8. a temperature sensor.
Detailed Description
The following describes the structure and embodiments of the present invention in further detail with reference to fig. 1.
As shown in figure 1, the invention aims at a fire extinguishing device for strengthening a fine water mist and a sound field, and mainly relates to a space arrangement of a plurality of sound source devices, fire sources and fine water mist nozzles 7 and a regulation and control scheme of the sound field. The single sound source device comprises a signal generator 1, a power amplifier 2 and a loudspeaker 3 which are connected in sequence. The signal generator 1 emits sound waves, which are amplified by the power amplifier 2 and transmitted to the loudspeaker 3. The speaker 3 is provided with a temperature sensor 8. Based on the invention, the following experiments were carried out, the fire source comprising an alcohol burner 4, a wick 5 and a generated flame 6:
1. experiment of acoustic wave fire extinguishing: before the experiment, the signal generator 1 and the power amplifier 2 are arranged, the lamp wick 5 is ignited by a lighter, after the lamp wick 5 is pre-burnt for 10-15 s, the power amplifier 2 is started, and the flame 6 cannot be extinguished within 1 minute. This experiment was repeated three times, pouring 15ml of alcohol each time;
2. experiment of spray fire extinguishing: the wick 5 is ignited by a lighter, after pre-burning for 10-15 s, the spray is turned on, and the flame 6 can not be extinguished within 1 minute. This experiment was repeated three times, pouring 15ml of alcohol each time;
3. combined fire extinguishing experiment: before the experiment, the signal generator 1 and the power amplifier 2 are arranged, the lamp wick 5 is ignited by a lighter, after the lamp wick 5 is pre-burnt for 10-15 s, the power amplifier 2 is started, sound waves are generated after approximately 5s delay, the spray is immediately opened, and the flame 6 is extinguished within 1 minute. Each experimental condition was repeated three times, and 15ml of alcohol was poured in each time.
The sound source device, the fire source and the water mist nozzles 7 are spatially arranged as shown in fig. 1, four speakers 3 are arranged around each water mist nozzle 7, and the centers of the four speakers 3 are respectively positioned at four positions (a, b, c), (a, -b, c), (-a, -b, c) and along the x-axis direction towards the corresponding water mist nozzle 7, with the water mist nozzle 7 as the origin; wherein, a, b, c>And 0, each is a distance in the xyz axis direction. The center of the alcohol lamp 4 is arranged in a concentric circle area which is c away from the water mist nozzle 7 in the z direction, the inner diameter of the concentric circle is 0.4R, and the outer diameter of the concentric circle is 0.6R. The water mist nozzles 7 cover a solid circular mist field area of radius R at a distance c in the z-direction. In the present embodiment, c is 20cm, the fine mist field cone angle θ is 60 °,
therefore, it is
b＝0.5R＝6cm，
Therefore, a is 16 cm.
The sound field regulation and control scheme is that when the temperature sensor 8 reaches a set threshold value, the signal generator 1 outputs 30 Hz-50 Hz sinusoidal sound waves, a certain signal amplitude (2.2V-17.2V) is set, and in addition, a gain knob of the power amplifier 2 needs to be adjusted to amplify signals as much as possible. Under the action of the water mist itself, the flames 6 in the concentric circle region are difficult to extinguish within 1min, and after a certain loudspeaker 3 is started, the flames 6 can be extinguished within 1 min.
The signal generator 1 is used for generating low-frequency sound wave analog electric signals, and is mainly used for emitting sinusoidal sound waves of 30 Hz-50 Hz, and the amplitude of the signals is 2.2V-17.2V.
The power amplifier 2 is used to amplify the low frequency acoustic wave analog electrical signal such that the sound pressure level at the flame 6 is equal to or greater than 100dB, even though its gain button is always directed at 0 dB.
And the loudspeaker 3 converts the amplified low-frequency sound wave analog electric signal into sound waves for playing.
The maximum capacity of the alcohol lamp 4 is 30ml, and 15ml of 99.7% absolute ethyl alcohol is filled in the alcohol lamp.
The lamp wick 5 is a ceramic fiber lamp wick, so that the size of the flame 6 is convenient to adjust.
The flame 6 should have a pre-ignition time of 10s to 15 s.
The water mist nozzle 7 is a pressure type rotational flow atomizing nozzle, the spraying pressure is about 3.4bar, and the spraying cone angle is about 60 degrees.
The switch of each sound source device is controlled by a respective temperature sensor 8, i.e. the loudspeaker 3 is switched on when the temperature sensor 8 on a certain loudspeaker 3 detects that the temperature in the vicinity has reached a certain threshold.
The experimental results show that: as shown in FIG. 2, the fire was not extinguished at 1.1V at 30Hz (even if the extinguishing time was longer than 60s), and was successfully extinguished at four voltages of 2.2V, 7.2V, 12.2V and 17.2V. Four groups of experiments are repeated under four voltages of 2.2V, 7.2V, 12.2V and 17.2V respectively, the average time of fire extinguishment is calculated, the differences are found to be small, and the result shows that when the signal amplitude is 2.2V-17.2V, the strengthening effect of fire extinguishment is the same, namely after the signal amplitude reaches a certain value, the signal amplitude is continuously increased, and the better strengthening effect of fire extinguishment cannot be achieved.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (8)
1. A fire extinguishing apparatus aiming at strengthening of a fine water mist and an external sound field is characterized by mainly comprising a space arrangement of a plurality of sound source devices and fine water mist nozzles and a sound field regulation and control scheme;
the sound source device comprises a signal generator, a power amplifier, a loudspeaker and a temperature sensor which are connected in sequence; the signal generator emits sound waves, and the sound waves are amplified by the power amplifier and then transmitted to the loudspeaker; the surface of the loudspeaker is provided with a temperature sensor;
spatial arrangement of the sound source device and the fine water mist nozzle: four loudspeakers are arranged around each fine water spray nozzle, the fine water spray nozzle is taken as an origin, the positions of the four loudspeakers are respectively (a, b, c), (a, -b, c), (-a, -b, c), and specifically:
b＝0.5R
wherein a, b, c >0, which are distances in the direction of the xyz axis, respectively; theta is the cone angle of the fine water mist nozzle, and the spraying range of the fine water mist nozzle at the distance c in the z direction is a circle with the radius of R;
the sound field regulation and control comprises that when the temperature sensor reaches a set threshold value, the signal generator is used for generating low-frequency sound wave analog electric signals, outputting 30 Hz-50 Hz sinusoidal sound waves, setting the signal amplitude to be 2.2-17.2V, and adjusting a gain knob of the power amplifier to amplify the signals as much as possible.
2. The fire extinguishing apparatus for strengthening a water mist applied sound field according to claim 1, wherein the power amplifier is used for amplifying the low-frequency sound wave analog electric signal to a certain extent, and the amplification is realized by a gain button.
3. The fire extinguishing apparatus aiming at strengthening of water mist plus sound field as claimed in claim 1, wherein the speaker converts the amplified low frequency sound wave analog electric signal into sound wave for playing.
4. The fire extinguishing apparatus for water mist plus sound field enhancement according to claim 1, wherein four speakers are provided around each water mist nozzle and are placed facing the corresponding water mist nozzle in the x-axis direction.
5. The fire extinguishing apparatus for strengthening a fine water mist plus sound field according to claim 1, wherein when the temperature sensor reaches a set threshold, the gain knob of the power amplifier is adjusted to make the sound pressure level at the fire source be greater than or equal to 100 dB.
6. The fire extinguishing apparatus for mist plus sound field enhancement of claim 1, wherein the switches of the plurality of sound source devices are controlled by respective temperature sensors, i.e. when a temperature sensor on a certain speaker detects that the temperature in the vicinity reaches a certain threshold, the speaker is turned on.
7. The fire extinguishing apparatus aiming at strengthening of fine water mist applied sound field according to claim 1, wherein the fine water mist nozzle is a pressure type swirl atomizing nozzle.
8. The fire extinguishing apparatus for mist plus sound field enhancement of claim 1, wherein the temperature sensor is mounted on the speaker on a side near the mist nozzle.
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| TWI412390B (en) * | 2008-07-11 | 2013-10-21 | Ching Wu Wang | Sound extinguisher and its fire extinguishing system |
| CN203750369U (en) * | 2013-12-26 | 2014-08-06 | 浙江大学 | Device for removing fine particles through acoustic agglomeration and spray combined effect |
| CN105903137A (en) * | 2016-04-29 | 2016-08-31 | 东华大学 | Low-frequency sound wave fire extinguisher |
| CN205802476U (en) * | 2016-07-05 | 2016-12-14 | 福建信邦物流科技有限公司 | A kind of lane stacker structure being provided with sound wave extinguishing device |
| EP3311886A1 (en) * | 2016-10-20 | 2018-04-25 | Siemens Schweiz AG | Muffled extinguishing nozzle assembly having a frequency selective noise dampening coating as well as suitable use |
| CN106964086A (en) * | 2017-03-30 | 2017-07-21 | 合肥工业大学 | A kind of sound wave extinguishing device for being used to test |
| CN107007961A (en) * | 2017-04-24 | 2017-08-04 | 东华大学 | A kind of fire extinguisher of adjustable acoustic pressure size |
| CN109833574A (en) * | 2017-11-29 | 2019-06-04 | 西安仁科电子科技有限公司 | A kind of intelligent sound wave fire extinguisher |
| KR101982070B1 (en) * | 2018-04-24 | 2019-05-24 | 주식회사 나노메딕스 | Handy-Type Spray Combined Sound Wave Extinguisher |
| CN108514790B (en) * | 2018-05-10 | 2023-10-03 | 中国计量大学 | Smoke eliminating method by hand-held fire smoke eliminator |
| CN108654268B (en) * | 2018-07-30 | 2024-02-27 | 中国计量大学 | Fire smoke removing system with coupling action of sound wave and spray and smoke eliminating method |
| CN109331372A (en) * | 2018-10-23 | 2019-02-15 | 佛山市南海区九江镇初级中学 | Fire extinguisher and fire extinguisher monitoring system |
| PH12018000432A1 (en) * | 2018-12-11 | 2020-06-22 | Iloilo Science And Technology Univ | Low audio frequency fire extinguisher |
| CN110064147A (en) * | 2019-05-30 | 2019-07-30 | 彭思诚 | The sound wave fire extinguisher of automatic monitoring tracking |
| CN112774058B (en) * | 2019-11-01 | 2022-10-14 | 香港理工大学深圳研究院 | Fire extinguishing system based on sound wave fire extinguishing and fire extinguishing method thereof |
| CN111202934A (en) * | 2020-01-16 | 2020-05-29 | 西安石油大学 | A sound wave fire extinguishing device with automatic power adjustment |
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