CN202841151U - Fire-fighting emergency broadcast system - Google Patents
Fire-fighting emergency broadcast system Download PDFInfo
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- CN202841151U CN202841151U CN2012204605137U CN201220460513U CN202841151U CN 202841151 U CN202841151 U CN 202841151U CN 2012204605137 U CN2012204605137 U CN 2012204605137U CN 201220460513 U CN201220460513 U CN 201220460513U CN 202841151 U CN202841151 U CN 202841151U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model discloses a fire-fighting emergency broadcast system. The technical scheme is that: the fire-fighting emergency broadcast system comprises a fire hazard alarm controller, a fire-fighting emergency broadcast host, digital power amplifiers, a main/standby power amplifier switching device, an output module, fire-fighting broadcast loudspeaker boxes, and built-in power supplies. The fire hazard alarm controller is respectively connected with the fire-fighting emergency broadcast host and the output module through alarm buses. The output module is connected with the fire-fighting broadcast loudspeaker boxes. The fire-fighting emergency broadcast host is connected with the digital power amplifiers through netting twines. The digital power amplifiers are connected with an impedance matching device. The impedance matching device is connected with the output module after being filtered by a filter. The beneficial effects are that: the main/standby power amplifier switching device and the power amplifiers can form one-main-one-standby and multiple-main-multiple-standby modes flexibly to guarantee the reliable operation of the system; when an alarm signal from the fire hazard alarm controller is received, an emergency broadcast state is initiated automatically to perform fire-fighting emergency broadcast; background music and fire-fighting emergency broadcast signals are automatically switched through an internal bus without needing help from an external relay or analog switch equipment; and data in a USB flash disk can be read through a USB interface, thereby completing the operation of playing music in the USB flash disk.
Description
Technical field
The utility model relates to the utility model and relates to fire alarm and fire-fighting link technical field, especially relate to a kind of digital power amplifier that utilizes as power amplifier, the fire emergence evacuation broadcast system that background music and fire emergence evacuation broadcast sound source signal switch voluntarily by internal bus.
Background technology
The place of, personnel comparatively dense large at flow of the people, such as public arenas such as school, hospital, hotel, markets, in case when breaking out of fire or other emergencies, the reasons such as many because of flow of the people, that noise is large, the staff is not easy floor manager and Evacuation, is difficult to guarantee people's personal safety.Along with the raising of people's fire-fighting consciousness, the application of fire emergence evacuation broadcast equipment is more and more extensive.When fire occured, fire emergence evacuation broadcast was that fire disaster escaping is evacuated and the important communication apparatus of fire extinguishing commander and other burst emergencies, played an important role in whole fire-fighting control and management system.During use; the emergent broadcast signal sends by the fire emergence evacuation broadcast main frame; after the power amplifier amplification; switched to the audio amplifier of broadcasting appointed area by broadcast module; realize emergent broadcast; circulate a notice of fire condition to the Field Force, and command and guide Field Force emergency evacuation, protect to greatest extent personnel's personal safety as well as the property safety.Power amplifier in the existing fire emergence evacuation broadcast system mostly is the simulated power amplifying circuit, and power efficiency is low, caloric value is high, needs larger radiator, thereby volume is large and overload capacity is low, the easy distortion of audio signal.The design at the main frame interface of existing fire emergence evacuation broadcast system is friendly not, is familiar with and uses more time-consuming; After power amplifier broke down, system then can't work; Configuration SD card interface or CD broadcast dish on the fire emergence evacuation broadcast main frame need to insert the SD card or put into the broadcast that CD carries out background music, but the use of CD is fewer and feweri, and the read or write speed of SD card are slow, the internal memory less, and useful life is low, and uses inconvenient.Application number is 200910074861.3, the patent application title be " a kind of switching of fire prevention broadcast circuit and detection system " and in a kind of fire broadcast system is disclosed, this system comprises the broadcasting output module that is comprised of fire broadcast module and normal broadcast module, with supporting two the broadcasting main lines with Vertical Shaft for Light-Current structure of broadcasting output module, and one group of loud speaker straight line with fire broadcast and normal broadcast message independent play-out, described fire broadcast module shares the loud speaker bus with the output bus of normal broadcast module, between above output bus and every loud speaker branch line, have additional interlock commutation circuit and the supporting CPU with CPU, send a control signal to the controlled end of interlock commutation circuit after CPU is processed the signal of the fire perceiving device collection of scene of fire, the interlock commutation circuit realizes the conversion of fire broadcast module and normal mode block signal by the contact adhesive of wherein relay.The application combines fire broadcast and normal broadcasting, take full advantage of the purpose that the fire broadcast system reaches normal play, share simultaneously a cover loud speaker, provide cost savings, reduced construction volume, but still there is baroque shortcoming in the structure of two cover broadcast systems among the application.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming that exists in the prior art, provide a kind of background music and fire emergence evacuation broadcast can switch voluntarily and have by internal bus the fire emergence evacuation broadcast system of active and standby power amplifier switch, the technical scheme that its adopts is: a kind of fire emergence evacuation broadcast system, it is characterized in that: described fire emergence evacuation broadcast system comprises fire alarm control unit, fire alarm control unit is connected with output module with the fire emergence evacuation broadcast main frame respectively by the warning bus, be connected with the fire-fighting audio amplifier on the described output module, described fire emergence evacuation broadcast main frame is connected with digital power amplifier by netting twine, described digital power amplifier is connected with impedance matching box, and described impedance matching box is connected with described output module by behind the filter filtering.
Technical characterictic of the present utility model also has: described digital power amplifier comprises main digital power amplifier and digital power amplifier for subsequent use, described main digital power amplifier and digital power amplifier for subsequent use all are connected on the active and standby power amplifier switch as input, and described active and standby power amplifier switch output is connected with described impedance matching box.
Technical characterictic of the present utility model also has: described fire broadcast main frame and digital power amplifier are powered by built-in power.
Technical characterictic of the present utility model also has: described built-in power is given described output module power supply behind filter filtering.
Technical characterictic of the present utility model also has: described fire emergence evacuation broadcast main frame comprises mainboard and the display panel that is connected, described mainboard comprises CPU, by from fire alarm control unit, inspire through the alarm signal behind the bus encoding/decoding, be solidificated in the emergent broadcast voice in the fire emergence evacuation broadcast main frame or process through CPU from the data of USB interface after export described digital power amplifier to by the power amplifier interface, broadcast through the relative fire broadcast audio amplifier of corresponding output module control.
Technical characterictic of the present utility model also has: from fire alarm control unit, inspire through the alarm signal behind the bus encoding/decoding, be solidificated in the emergent broadcast voice in the fire emergence evacuation broadcast main frame or process through CPU from the data of USB interface after outwards export by monitor speaker from the monitoring interface of CPU.
Technical characterictic of the present utility model also has: input described CPU from the audio input signal of microphone, through exporting described digital power amplifier to by the power amplifier interface after the CPU processing, broadcast or outwards export by monitor speaker from the monitoring interface of CPU through the relative fire broadcast audio amplifier of corresponding output module control.
Technical characterictic of the present utility model also has: power module is used for to described CPU power supply.
The beneficial effects of the utility model are: 1) active and standby power amplifier switch and power amplifier can form the many standby patterns of main standby, many masters flexibly, guarantee to automatically switch to when in a single day main power amplifier breaks down power amplifier output for subsequent use, automatically restore to main power amplifier output after waiting for main power amplifier trouble shooting, guarantee system's reliability service;
2) power amplifier has adopted the digitized signal amplifying technique, and volume is little, lightweight, and efficient is high, caloric value is low and need not large-scale radiator, and the utilization of filter has guaranteed the signal output quality, eliminates and disturbs.
3) background music and fire emergence evacuation broadcast signal switch voluntarily by internal bus, need not to switch by outside relay or analog switch equipment;
4) the built-in MP3 player of fire emergence evacuation broadcast main frame by USB interface, can read the data in the USB flash disk, finishes the play operation of the interior music of USB flash disk and other information;
5) be installed in monitor speaker synchronously preset monitored and background music broadcast on the control cubicle, reached the purpose of monitoring.
6) this fire emergence evacuation broadcast system configuration scheme is flexible, is fit to various fire engineerings.
Description of drawings
Accompanying drawing 1 is this fire broadcast system schematic, accompanying drawing 2 is fire broadcast main frame principle schematic, accompanying drawing 3 is digital power amplifier circuit theory schematic diagrames, and accompanying drawing 4 is connection diagrams between main digital power amplifier, digital power amplifier for subsequent use and the active and standby power amplifier switch.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described.This fire emergence evacuation broadcast system comprises fire alarm control unit, fire emergence evacuation broadcast main frame, digital power amplifier, active and standby power amplifier switch, output module, fire broadcast audio amplifier and built-in power.The warning bus that is connected to the fire alarm control unit output is connected with the fire emergence evacuation broadcast main frame, the fire emergence evacuation broadcast main frame is connected with digital power amplifier by netting twine, digital power amplifier comprises main digital power amplifier and digital power amplifier for subsequent use, main digital power amplifier and digital power amplifier for subsequent use all are connected on the active and standby power amplifier switch as input, and active and standby power amplifier switch also is connected with impedance matching box.Impedance matching box is connected with filter by audio-frequency bus, and filter is connected with the input of output module, and the warning bus also is connected with the input of output module, is connected with the fire broadcast audio amplifier on the output of output module.Fire broadcast main frame and digital power amplifier are powered by built-in power.Built-in power is powered to output module behind filter filtering.
The fire emergence evacuation broadcast main frame comprises mainboard and the display panel that is connected, mainboard comprises CPU, by from fire alarm control unit, inspire through the alarm signal behind the bus encoding/decoding, be solidificated in the emergent broadcast voice in the fire emergence evacuation broadcast main frame or process through CPU from the data of USB interface after export digital power amplifier to by the power amplifier interface, broadcast through the relative fire broadcast audio amplifier of corresponding output module control; From fire alarm control unit, inspire through the alarm signal behind the bus encoding/decoding, be solidificated in the emergent broadcast voice in the fire emergence evacuation broadcast main frame or can also process through CPU from the data of USB interface after outwards export by monitor speaker from the monitoring interface of CPU; Audio input signal input CPU from microphone, through exporting digital power amplifier to by the power amplifier interface after the CPU processing, broadcast or outwards export by monitor speaker from the monitoring interface of CPU through the relative fire broadcast audio amplifier of corresponding output module control.Power module is used for powering to CPU.
Operation principle: fire emergence evacuation broadcast main frame output emergent broadcast signal, after the digital power amplifier amplification, switched to the fire broadcast audio amplifier of broadcasting appointed area by broadcast module, realize emergent broadcast.
Fire alarm control unit: fire alarm control unit is in the automatic fire alarm system, can power for fire detector, receive, process and transmit the fire signal of sensing point, send the sound and light alarm signal, show simultaneously and record position and the time of fire generation, and to linkage control device send the interlock control command alarm control unit, be core and the maincenter of whole automatic fire alarm control system.
The fire emergence evacuation broadcast main frame: the fire emergence evacuation broadcast main frame is the control centre of fire emergence evacuation broadcast system; Interface information shows that employing 192*64 lattice lcd shows, brand-new, friendly graphical man-machine interface is operating state and the MP3 broadcast interface of display system intuitively, and button adopts touch key, carries out each function conversion, and is easy-to-understand, easy and simple to handle; Built-in MP3 player is furnished with USB interface, can automatically identify WMA in the USB flash disk equipment and the audio file of MP3 format and carry out the broadcast of background music; Can receive the linkage command of fire alarm and linkage controller, automatically enter the emergent broadcast state and play the default voice evacuation broadcasting of Chinese and English electronics of built-in curing; Source of sound switches by internal bus, need not to switch by outside relay or analog switch equipment; Carry the standby electrical interface of DC24V and Intelligentized battery management of charging and discharging module.Have output overcurrent protection, output short circuit protection and auto restore facility.The efficient voltage changer of inner employing, quiescent dissipation is low, and carrying load ability is strong, and has the power failure warning function; Every fire emergence evacuation broadcast main frame has 4 the tunnel and is used for the power amplifier interface that power amplifier is exported, and every road power amplifier all is furnished with signal testing function, detects the operating state of digital power amplifier.Main frame also has been equipped with two road audio output interfaces, cooperates the audio distribution device, can extend to more multichannel power amplifier output, can export simultaneously broadcast message to any power amplifier.Be applicable to various large, medium and small type fire engineerings.
Digital power amplifier: will amplify from the weak audio signal of fire broadcast main frame, and promote corresponding audio amplifier sound reproduction.Adopt the high-fidelity digital signal amplification technique, volume is little, lightweight, efficient is high, and caloric value is low and need not large-scale radiator.Power amplifier fault-signal interface is provided, and when being used for active and standby power amplifier pattern, the control switch automatically switches to power amplifier output for subsequent use, automatically returns to main power amplifier output after the trouble shooting.
The basic principle of digital power amplifier: a reference triangular wave signal of input audio signal and triangular-wave generator output compares (frequency of triangular signal is much larger than the input signal bandwidth).The output of comparator obtains pulse duration with the pulse signal of audio input signal changes in amplitude, i.e. pwm control signal.Transistor in the pwm control signal control bridge drive circuit makes it work on off state, thereby obtains a PWM waveform that has amplified, and pwm signal is by behind the low-pass filter circuit, and high-frequency carrier signal and high-frequency signal get harmonic component by filtering.Obtain maximum power output by impedance inverter circuit at last.
Active and standby power amplifier switch: active and standby power amplifier switch is the expansion equipment of fire emergence evacuation broadcast system.When active and standby power amplifier pattern, when breaking down, main power amplifier can automatically switch to power amplifier output for subsequent use, automatically restore to main power amplifier output after the main power amplifier trouble shooting, realize fault power amplifier automatic seamless replacement function.The safeguards system reliability service.
Broadcasting subregion control panel: be connected with broadcast host with the alarm linkage controller respectively with control bus by the warning bus, the start and stop of control broadcast module, finish together the control of interlock emergent broadcast, be convenient to the direct control to the system broadcasts module, and intuitively reflect line status and the broadcast state of each subregion.
The audio distribution device: the audio distribution device is mounted in the audio output signal distributing equipment between source of sound and the power amplifier, is divided into three tunnel identical audio output signals after input audio signal is processed; When there is the equipment (power amplifier) of many input signals at the scene, if directly being connected in parallel, audio signal very easily causes signal cross-talk and signal attenuation, make rear class output signal step-down.Can distribute output to audio signal by the accessing to audio distributor, guarantee that each road signal is undistorted and do not have signal attenuation.
Output module: can carry out on off control to on-the-spot fire broadcast audio amplifier, thus the function that realization is broadcasted the specific region.Major function is the terminal control of realizing in the fire emergence evacuation broadcast system.This output module has short circuit, the breakage detection function of audio-frequency bus and broadcasting audio amplifier line.When output module detects line fault, with automatic fault-reporting information.The user just can obtain the information such as fault type, place by controller, thereby fixes a breakdown rapidly.
The broadcasting audio amplifier: major function is the terminal playback that realizes in the fire emergence evacuation broadcast system.The broadcasting audio amplifier mainly contains two kinds of patterns: wall-hanging loudspeaker and ceiling type voice box.Its type comprises fire-fighting fire broadcast audio amplifier and monitor speaker, and the fire broadcast audio amplifier directly is connected to the scene, and such as each floor, and the monitoring audio amplifier is positioned on the control cubicle, but the manual operation listening key controls the opening and closing of monitoring.
Certainly; above-mentioned explanation is not limitation of the utility model; the utility model also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement also belong to protection range of the present utility model.
Claims (8)
1. fire emergence evacuation broadcast system, it is characterized in that: described fire emergence evacuation broadcast system comprises fire alarm control unit, fire alarm control unit is connected with output module with the fire emergence evacuation broadcast main frame respectively by the warning bus, be connected with the fire broadcast audio amplifier on the described output module, described fire emergence evacuation broadcast main frame is connected with digital power amplifier by netting twine, described digital power amplifier is connected with impedance matching box, and described impedance matching box is connected with described output module by behind the filter filtering.
2. according to fire emergence evacuation broadcast claimed in claim 1 system, it is characterized in that: described digital power amplifier comprises main digital power amplifier and digital power amplifier for subsequent use, described main digital power amplifier and digital power amplifier for subsequent use all are connected on the active and standby power amplifier switch as input, and described active and standby power amplifier switch output is connected with described impedance matching box.
3. according to fire emergence evacuation broadcast claimed in claim 2 system, it is characterized in that: described fire broadcast main frame and digital power amplifier are powered by built-in power.
4. according to fire emergence evacuation broadcast claimed in claim 3 system, it is characterized in that: described built-in power behind filter filtering to described output module power supply.
5. according to claim 1 or 2 described fire emergence evacuation broadcast systems, it is characterized in that: described fire emergence evacuation broadcast main frame comprises mainboard and the display panel that is connected, described mainboard comprises CPU, by from fire alarm control unit, inspire through the alarm signal behind the bus encoding/decoding, be solidificated in the emergent broadcast voice in the fire emergence evacuation broadcast main frame or process through CPU from the data of USB interface after export described digital power amplifier to by the power amplifier interface, broadcast through the relative fire broadcast audio amplifier of corresponding output module control.
6. according to fire emergence evacuation broadcast claimed in claim 5 system, it is characterized in that: from fire alarm control unit, inspire through the alarm signal behind the bus encoding/decoding, be solidificated in the emergent broadcast voice in the fire emergence evacuation broadcast main frame or process through CPU from the data of USB interface after outwards export by monitor speaker from the monitoring interface of CPU.
7. according to fire emergence evacuation broadcast claimed in claim 6 system, it is characterized in that: input described CPU from the audio input signal of microphone, through exporting described digital power amplifier to by the power amplifier interface after the CPU processing, broadcast or outwards export by monitor speaker from the monitoring interface of CPU through the relative fire broadcast audio amplifier of corresponding output module control.
8. according to fire emergence evacuation broadcast claimed in claim 6 system, it is characterized in that: power module is used for to described CPU power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204605137U CN202841151U (en) | 2012-09-11 | 2012-09-11 | Fire-fighting emergency broadcast system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012204605137U CN202841151U (en) | 2012-09-11 | 2012-09-11 | Fire-fighting emergency broadcast system |
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| CN202841151U true CN202841151U (en) | 2013-03-27 |
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| CN2012204605137U Expired - Lifetime CN202841151U (en) | 2012-09-11 | 2012-09-11 | Fire-fighting emergency broadcast system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607252A (en) * | 2013-11-22 | 2014-02-26 | 天津市北海通信技术有限公司 | Standby pool switching method for PA system |
| CN103944659A (en) * | 2014-04-29 | 2014-07-23 | 天津市黎明时代轨道交通技术有限公司 | Digital amplifier server based on public broadcasting system |
| CN103974180A (en) * | 2014-04-23 | 2014-08-06 | 广州市迪士普音响科技有限公司 | Power amplifier unit deploying method of power amplifier matrix |
| CN104393943A (en) * | 2013-11-20 | 2015-03-04 | 广州市保伦电子有限公司 | Emergency voice broadcast evacuation system |
| CN104581601A (en) * | 2015-01-09 | 2015-04-29 | 广州市泰昌实业有限公司 | Dada information collecting method, device and system of fire protection emergency broadcasting and fire protection special telephone system |
| CN105487453A (en) * | 2015-12-31 | 2016-04-13 | 天津市北海通信技术有限公司 | Fire-fighting emergency broadcast output controller |
| CN105703864A (en) * | 2014-11-27 | 2016-06-22 | 上海工程技术大学 | Building public broadcasting system |
| CN108011681A (en) * | 2017-07-18 | 2018-05-08 | 中铁建电气化局集团南方工程有限公司 | Interim safety automation linkage broadcast system and its construction method in subway work |
| CN110048792A (en) * | 2019-05-27 | 2019-07-23 | 哈尔滨奥特科技有限公司 | Background music and fire broadcast shared system |
| CN110233690A (en) * | 2019-07-08 | 2019-09-13 | 格睿通智能科技（深圳）有限公司 | A kind of double bus multiloop fire broadcast system, implementation method and device |
| CN111918195A (en) * | 2020-08-18 | 2020-11-10 | 东莞精恒电子有限公司 | Intelligent fire-fighting digital power amplifier partition broadcasting system |
| CN112134637A (en) * | 2020-09-23 | 2020-12-25 | 中广核工程有限公司 | Emergency broadcasting system and method for nuclear power plant |
| WO2024060606A1 (en) * | 2022-09-19 | 2024-03-28 | 广州市迪士普音响科技有限公司 | Fire-fighting emergency broadcasting device |
-
2012
- 2012-09-11 CN CN2012204605137U patent/CN202841151U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393943A (en) * | 2013-11-20 | 2015-03-04 | 广州市保伦电子有限公司 | Emergency voice broadcast evacuation system |
| CN103607252A (en) * | 2013-11-22 | 2014-02-26 | 天津市北海通信技术有限公司 | Standby pool switching method for PA system |
| CN103974180A (en) * | 2014-04-23 | 2014-08-06 | 广州市迪士普音响科技有限公司 | Power amplifier unit deploying method of power amplifier matrix |
| CN103974180B (en) * | 2014-04-23 | 2017-08-08 | 广州市迪士普音响科技有限公司 | A kind of power amplifier unit concocting method of power amplifier battle array |
| CN103944659A (en) * | 2014-04-29 | 2014-07-23 | 天津市黎明时代轨道交通技术有限公司 | Digital amplifier server based on public broadcasting system |
| CN105703864A (en) * | 2014-11-27 | 2016-06-22 | 上海工程技术大学 | Building public broadcasting system |
| CN104581601A (en) * | 2015-01-09 | 2015-04-29 | 广州市泰昌实业有限公司 | Dada information collecting method, device and system of fire protection emergency broadcasting and fire protection special telephone system |
| CN105487453A (en) * | 2015-12-31 | 2016-04-13 | 天津市北海通信技术有限公司 | Fire-fighting emergency broadcast output controller |
| CN108011681A (en) * | 2017-07-18 | 2018-05-08 | 中铁建电气化局集团南方工程有限公司 | Interim safety automation linkage broadcast system and its construction method in subway work |
| CN108011681B (en) * | 2017-07-18 | 2023-11-24 | 中铁建电气化局集团南方工程有限公司 | Temporary safety automatic linkage broadcasting system in subway construction and construction method thereof |
| CN110048792A (en) * | 2019-05-27 | 2019-07-23 | 哈尔滨奥特科技有限公司 | Background music and fire broadcast shared system |
| CN110233690A (en) * | 2019-07-08 | 2019-09-13 | 格睿通智能科技（深圳）有限公司 | A kind of double bus multiloop fire broadcast system, implementation method and device |
| CN110233690B (en) * | 2019-07-08 | 2024-03-22 | 格睿通电子(深圳)有限公司 | Two-bus multi-loop fire control broadcasting system, implementation method and device |
| CN111918195A (en) * | 2020-08-18 | 2020-11-10 | 东莞精恒电子有限公司 | Intelligent fire-fighting digital power amplifier partition broadcasting system |
| CN112134637A (en) * | 2020-09-23 | 2020-12-25 | 中广核工程有限公司 | Emergency broadcasting system and method for nuclear power plant |
| WO2024060606A1 (en) * | 2022-09-19 | 2024-03-28 | 广州市迪士普音响科技有限公司 | Fire-fighting emergency broadcasting device |
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Effective date of registration: 20170505 Address after: Xinluo Avenue high tech Zone of Ji'nan City, Shandong province 250000 No. 786 Room 401 Patentee after: SHANDONG ZHONGHAI INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 250100 No. 71 industrial North Road, Licheng District, Shandong, Ji'nan Patentee before: Shandong Zhonghai Public Security Equipment Co.,Ltd. |
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Granted publication date: 20130327 |