CN204926392U - Detector is felt to wireless photoelectric type cigarette - Google Patents
Detector is felt to wireless photoelectric type cigarette Download PDFInfo
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- CN204926392U CN204926392U CN201520454781.1U CN201520454781U CN204926392U CN 204926392 U CN204926392 U CN 204926392U CN 201520454781 U CN201520454781 U CN 201520454781U CN 204926392 U CN204926392 U CN 204926392U
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Abstract
The utility model relates to a detector is felt to wireless photoelectric type cigarette. Top -down is equipped with the epitheca in proper order, the circuit board, the drain pan, mounting plate, the epitheca top is equipped with key hole and alarm indicator hole, the middle position of circuit board is opened flutedly, the groove connection maze is passed through in the front of circuit board, the circuit board is through expanding the screw fixation on the epitheca, between have a collar, be equipped with the battery compartment on the detector drain pan, the contact electrode point, the buzzer, mounting plate central authorities open there is the fixed orifices, and be equipped with with the corresponding shell fragment of contact electrode point, the epitheca passes through the buckle with the drain pan and is connected, mounting plate passes through the spliced pole with the drain pan and is connected. The utility model discloses a wireless communication technique is felt detection technology with the cigarette and is combined together, can independently survey the condition of a fire, simultaneously can with the communication of fire control host computer, play fire control linkage's effect, can in time get rid of in the maze because the wrong report that the environmental disturbance caused is alert, adopt the electrode contact mode, the fine detects the detector owing to the unnecessary trouble that causes is removed to artificial reason in the use, adopt the wireless RF chips of low -power consumption of TI's the area mode of responseing, can realize the two -way intercommunication of information, reduced system power dissipation.
Description
Technical field
The present invention relates to a kind of smoke detector, particularly a kind of photo-electric smoke alarm utilizing low-consumption wireless mechanics of communication simultaneously to get rid of environmental interference.
Background technology
Existing smoke alarm applies the detector the most general, quantity is maximum in the world at present.It is widely used in the places such as household, market, hotel, office building, dancing hall, warehouse.Smoke fire detector is divided into point-type and line-type smoke detector.Wherein, what market application was more is spot-type smoke detector, and point detector is divided into ion-type and photo-electric smoke fire detector.
Existing photo-electric smoke alarm is mostly wired fire product, and is mostly freestanding detector.Need large area to connect up in these smoke alarm installation processes, need large area to investigate if having in a detector use procedure to break down, install and the cost of overhaul higher.
The existing smoke alarm utilizing wireless transmission, labyrinth is positioned at the side of whole circuit board, if detector is arranged on unfavorable sense cigarette position, when there being the smoke signal from different azimuth, can not send sound and light alarm timely.Chinese patent CN03203787.2 discloses a kind of smoke detector, and it can not meet the requirement about directivity test in GB GB20517-2006.Requirement in GB, the different azimuth of alarm is measured 8 secondary response threshold values, often survey once, alarm should rotate 45 ° by same direction around its vertical axis, its maximum response threshold value and minimum response threshold value are recorded, and the ratio of its minimax response lag can not be greater than 1.6, and the labyrinth design in its patent, the requirement of directivity test in GB can not be met, and its smoke alarm is in installation process, if taken away by artificial, just can not in normal monitoring range time, fail alert notice user timely.
Current fire detection signal Processing Algorithm mostly adopts base conditioning algorithm, comprising: threshold method, rate of change detection method, Trend Algorithm, slope algorithm, duration algorithm.Smoke alarm mainly adopts threshold method and relevant self-calibration algorithm to carry out coherent signal process in the market.Threshold method: threshold method is that one is the easiest, uses Fire Detection Algorithm the most general.This algorithm is one or several decision threshold of setting, when the cigarette sense signal AD value collected exceedes setting threshold value, just sends alerting signal.Although threshold method simply, easily realizes, it is poor to the adaptive faculty of environment, easily produces wrong report phenomenon.And install and use in process at detector, the labyrinth of detector is easily subject to the pollution of dust in environment, changes in labyrinth to the scattering path of light, causes the generation of false alarm.
Summary of the invention
The present invention, in order to make up the defect of prior art, provides one and utilizes wireless communication technique, can install in a free-standing and easy for installation, can get rid of environmental pollution, Real-Time Monitoring detector duty, reduce the photo-electric smoke alarm of engineering cost simultaneously.
The present invention is achieved through the following technical solutions:
A kind of wireless optical electric-type smoke alarm, be provided with upper casing successively from top to bottom, circuit board, drain pan, mounting base, it is characterized in that: described upper casing top is provided with key hole and alarm lamp hole, the middle position of described circuit board has groove, the front of circuit board connects labyrinth by groove, described circuit board is fixed on upper casing by setscrew, installing ring is had between circuit board and upper casing, described detector drain pan is provided with battery compartment, contact electrode points, hummer, described mounting base central authorities have fixed orifice, mounting base is provided with the shell fragment corresponding with contacting electrode points, described upper casing is connected by buckle with drain pan, described mounting base is connected by joint pin with drain pan.
The interface of two infrared tubes in described labyrinth is 180 °, can just in time be stuck in the groove of circuit board, can ensure that smog is more uniformly by labyrinth, labyrinth upper cover is just in time attached to upper casing inwall, and labyrinth can more firmly be fixed in the middle of circuit board and upper casing.
The reverse side of described circuit board is provided with single-chip microcomputer, AD acquisition module, wireless radio frequency modules, infrared light emitting diode and infrared light reception diode, and labyrinth, test button, alarm lamp are equipped with in front.
Described single-chip microcomputer is the MSP430 chip of low-power consumption, greatly reduces system power dissipation, and its static current of lcd of detector being in dormant state is less than 8uA.
Adopt 9V lithium battery power supply in described battery compartment, detector can normally work 6 ~ 8 years, greatly reduces the trouble that user cost and battery altering process are brought.
When above-mentioned wireless optical electric-type smoke alarm carries out detection, utilize light scattering principle to detect the smog that Initial Stage of Fire produces, utilize 433MHz communication frequency band to carry out Signal transmissions, it is characterized in that: specifically comprise the steps:
(1) learning process: in order to distinguish the smoke alarm of each fire-fighting main frame association, before normal work, utilize telepilot to each detector study coding, encoded content comprises fire-fighting host address, detector building, the information such as unit, room number, detector sequence number, test button presses for more than 1s, and wireless radio frequency modules enters learning state; If detector learning success, telepilot can receive the answer signal that wireless radio frequency modules sends, and the hummer of detector can send prompt tone simultaneously, the success of prompting address learning, each detector is by study, obtain the address information of self, be provided with the function of identification, if learn unsuccessful, telepilot can not receive answer signal, the hummer of detector does not send prompt tone simultaneously, repeats above-mentioned length by test button operation, continues to enter learning state; If contrary test button is pressed be no more than 1s, detector just enters test job pattern, and detector sends out test signal by wireless radio frequency modules.
(2) smoke signal and battery voltage signal gatherer process: the present invention, in order to reduce system power dissipation, adopts time-sharing handling method; Detector is in normal operating conditions, when in environment during non smoke, infrared light reception diode does not receive the infrared light that infrared light emitting diode sends, the sample circuit of follow-up AD acquisition module is without change in electric, then the sampling period of smoke signal is 8S, carries out a smoke signal AD sample every 8S; When there being smog in environment, smoke particle enters the infrared light generation scattering in labyrinth (5), infrared light emitting diode being sent, the intensity of the infrared light of scattering and smokescope are some linear, subsequent sampling circuit changes, judge these variable quantities to be confirmed whether fire alarm occurs by single-chip microcomputer, if the AD value of double collection is higher than the threshold value of setting, then enter alert status, sampling period changes 2S into, improves the accuracy of smoke detection by shortening the sampling period; Single-chip microcomputer is by gathering the data analysis come, judge whether that the condition of a fire occurs, once confirmation fire alarm, alarm lamp is lighted, and starts buzzer warning, utilizes wireless communication technique simultaneously, fire signal is uploaded to fire-fighting main frame, fire-fighting main frame notifies user by making a phone call or sending short messages, and starts wireless switching auxiliary device simultaneously and starts water pump or hose saddle, reach the effect of fire-fighting link;
(3) smoke signal processing procedure: adopt the pollution treatment method that environment substrate value is followed, first to the cigarette sense signal gathered, utilize median Mean Filtering Algorithm to its filtering process: sample length is 12, remove maximal value, remove minimum value, residue length be 10 sample get average M; In clean environment, each M value gathered is as the base value ADstart gathering smog AD value, and gathered a cigarette sense according to actual conditions every 24 hours and pollute signal, alarm threshold value is set to gate_value.The soiling value of collection is left in the array of a Savesmoke [30], when the soiling value number gathered is less than 30, just existing soiling value is got average to judge, when the soiling value gathered is greater than 30, takes 30 soiling values in the mode peek group of first in first out to get average and obtain g_smokeadnew; If the soiling value gathered is greater than the smog AD base value originally arranged, just think to exist and pollute, alarm threshold value also increases accordingly, and its increment size is g_smokeadnew_Adstart; Utilize and have alarm threshold value under pollutional condition as new alarm threshold value, recycle basic cigarette sense thresholding algorithm to judge whether reality has smog fire to occur;
(4) active reporting process: in order to verify that detector is in normal operating conditions, and its work state information is uploaded to fire-fighting main frame, smoke alarm in the present invention in the course of the work, detector by wireless radio frequency modules every ten minutes active reporting data, whether data message comprises has the condition of a fire to occur or whether working battery is under-voltage and whether detector is in the information of normal operating conditions, wireless radio frequency modules is while reported data, the pilot lamp of detector is glittering, and reminding user detector is in normal operating conditions.
Further, described carry out step (2) smoke signal gatherer process while, AD acquisition module is also sampled to cell voltage, its sampling period is five minutes, if the voltage signal collected is lower than normal working voltage, hummer just sends under-voltage prompting, and reminding user changes battery in time, avoid normally working because battery undervoltage affects detector, bring unnecessary trouble;
Further, when the present invention is extractd by artificial or other reasons detector, electrode approach is contacted because mounting base adopts with drain pan, when detector is taken away from installation site, contact electrode points and shell fragment disconnect, microprocessor detect is less than contact electrode signal, by to detection signal analysis, think that detector is in abnormal operating state, pilot lamp sends warning reminding signal, detector is in abnormal operating state by wireless radio frequency modules and is uploaded to fire-fighting main frame by detector in time, and main frame can know which detector is taken off very soon.
Described monitoring detector is removed removing contact electrode approach also can adopt tongue tube or Hall element realization.
The invention has the beneficial effects as follows:
1. the present invention adopts wireless communication technique to combine with cigarette sense Detection Techniques, not only can the standalone probe condition of a fire, simultaneously can with fire-fighting host communication, play the effect of fire-fighting link.
2. the present invention is to the process of smoke signal, adopts the pollution treatment method that environment substrate value is followed, and gets rid of in time in labyrinth due to false alarm etc. that environmental interference causes.
3. inventive shell design adopts electrode contact mode, detector can well be detected in use because artificial origin extracts the unnecessary trouble that detector causes.
4. the present invention adopts 433MHz wireless communication technique, adopts the low-consumption wireless radio frequency chip of the band answer-mode of TI, not only can realize the two-way intercommunication of information, also reduce system power dissipation; Adopt 9V lithium electricity simultaneously, ensure that detector can normally work 6 ~ 8 years in powered battery situation, decrease the trouble that user changes battery.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing 1 is the structural representation of a kind of wireless optical electric-type of the present invention smoke alarm;
Accompanying drawing 2 is the hardware pipeline figure of a kind of wireless optical electric-type of the present invention smoke alarm
Accompanying drawing 3 is the workflow diagram of a kind of wireless optical electric-type of the present invention smoke alarm;
Accompanying drawing 4 is the circuit board dimensional printed chart of a kind of wireless optical electric-type of the present invention smoke alarm;
Accompanying drawing 5 is the data analysis test result figure that smoke alarm of the present invention gathers.
In figure, 1, key hole, 2, alarm lamp hole, 3, installing ring, 4, upper casing, 5, labyrinth, 6, circuit board, 7, battery spring lamination, 8, hummer, 9, battery compartment, 10, setscrew hole, 11, drain pan, 12, buckle, 13, fixed orifice, 14, mounting base, 15, joint pin, 16, electrode points, 17, shell fragment, 18, infrared tube, 19, groove.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated, but be not used for limiting the scope of the invention.
As shown in Figure 1, wireless optical electric-type smoke alarm of the present invention, be provided with upper casing 4 successively from top to bottom, circuit board 6, drain pan 11, mounting base 14, it is characterized in that: described upper casing top is provided with key hole 1 and alarm lamp hole 2, the middle position of described circuit board 6 has groove 19, the front of circuit board 6 connects labyrinth 5 by groove 19, the interface of two infrared tubes 18 in labyrinth 5 is 180 °, can just in time be stuck in the groove 19 of circuit board 6, smog can be ensured more uniformly by labyrinth 5, labyrinth 5 upper cover is just in time attached to upper casing 4 inwall, it is middle with upper casing 4 that labyrinth 5 more firmly can be fixed on circuit board 6, the reverse side of circuit board 6 is provided with the single-chip microcomputer MSP430 chip of low-power consumption, AD acquisition module, wireless radio frequency modules, infrared light emitting diode and infrared light reception diode.Described circuit board 6 is fixed on upper casing 4 by setscrew, installing ring 3 is had between circuit board 6 and upper casing 4, installing ring 3 effectively can block smoke particle, smoke particle is avoided to waft from the gap between circuit board and upper casing 4, effective raising detector sensitivity, described drain pan 11 is provided with battery compartment 9, contact electrode points 16, hummer 8, described mounting base 14 central authorities have fixed orifice 13, mounting base 14 is provided with the shell fragment 17 corresponding with contacting electrode points 16, described upper casing 4 is connected by buckle 12 with drain pan 11, described mounting base 14 is connected by joint pin 15 with drain pan 11, the present invention adopts 9V lithium battery power supply, detector can normally work 6 ~ 8 years, greatly reduce the trouble that user cost and battery altering process are brought.
When above-mentioned wireless optical electric-type smoke alarm carries out detection, light scattering principle is utilized to detect the smog that Initial Stage of Fire produces, utilize 433MHz communication frequency band to carry out Signal transmissions, as shown in Figure 3, specifically comprise the steps: first detector to be carried out system initialization, pilot lamp is glittering, hummer 8 sound one sound, the time of setting timing monitoring, then:
(1) learning process: utilized telepilot to each detector study coding before normal work, encoded content comprises the information such as fire-fighting host address, detector building, unit, room number, detector sequence number.Test button presses for more than 1s, and wireless radio frequency modules enters learning state; If detector learning success, telepilot can receive the answer signal that wireless radio frequency modules sends, and the hummer 8 of detector can send prompt tone simultaneously, the success of prompting address learning, each detector is by study, obtain the address information of self, be provided with the function of identification, if learn unsuccessful, telepilot can not receive answer signal, the hummer 8 of detector does not send prompt tone simultaneously, repeats above-mentioned length by test button operation, continues to enter learning state; If contrary test button is pressed be no more than 1s, detector just enters test job pattern, and wireless radio frequency modules sends out test signal.
(2) smoke signal and battery voltage signal gatherer process: the present invention, in order to reduce system power dissipation, adopts time-sharing handling method; Detector is in normal operating conditions, when in environment during non smoke, infrared light reception diode does not receive the infrared light that infrared light emitting diode sends, the sample circuit of follow-up AD acquisition module is without change in electric, then the sampling period of smoke signal is 8S, carries out a smoke signal AD sample every 8S; When there being smog in environment, smoke particle enters the infrared light generation scattering in labyrinth (5), infrared light emitting diode being sent, the intensity of the infrared light of scattering and smokescope are some linear, subsequent sampling circuit changes, judge these variable quantities to be confirmed whether fire alarm occurs by single-chip microcomputer, if the AD value of double collection is higher than the threshold value of setting, then enter alert status, sampling period changes 2S into, improves the accuracy of smoke detection by shortening the sampling period; Single-chip microcomputer is by gathering the data analysis come, judge whether that the condition of a fire occurs, once confirmation fire alarm, alarm lamp (2) is lighted, and starts hummer (8) warning, utilizes wireless communication technique simultaneously, fire signal is uploaded to fire-fighting main frame, fire-fighting main frame notifies user by making a phone call or sending short messages, and starts wireless switching auxiliary device simultaneously and starts water pump or hose saddle, reach the effect of fire-fighting link; Simultaneously, AD acquisition module is also sampled to cell voltage, its sampling period is five minutes, if the voltage signal collected is lower than normal working voltage, hummer just sends under-voltage prompting, reminding user changes battery in time, avoids normally working because battery undervoltage affects detector, brings unnecessary trouble;
(3) smoke signal processing procedure: adopt the pollution treatment method that environment substrate value is followed, first to the cigarette sense signal gathered, utilize median Mean Filtering Algorithm to its filtering process: sample length is 12, remove maximal value, remove minimum value, residue length be 10 sample get average M; In clean environment, each M value gathered is as the base value ADstart gathering smog AD value, and gathered a cigarette sense according to actual conditions every 24 hours and pollute signal, alarm threshold value is set to gate_value.The soiling value of collection is left in the array of a Savesmoke [30], when the soiling value number gathered is less than 30, just existing soiling value is got average to judge, when the soiling value gathered is greater than 30, takes 30 soiling values in the mode peek group of first in first out to get average and obtain g_smokeadnew; If the soiling value gathered is greater than the smog AD base value originally arranged, just think to exist and pollute, alarm threshold value also increases accordingly, and its increment size is g_smokeadnew_Adstart; Utilize and have alarm threshold value under pollutional condition as new alarm threshold value, recycle basic cigarette sense thresholding algorithm to judge whether reality has smog fire to occur;
Utilize this processing mode, the data analysis that actual smoke alarm gathers is found, when there is pollution in labyrinth, its smog base value is also in certain variation tendency, whether just can well get rid of due to pollution that environmental factor causes according to this feature, by analyzing mass data, draw following test result as shown in Figure 5.
Data analysis: as can be seen from data drawing list, when the external world has pollution to exist, the new smog AD value gathered increases, and calculate the AD value polluted and also can become large, its alarm threshold value becomes large thereupon, now judges that the condition of a fire judges according to new alarm threshold value.When pollution is removed, the new AD value gathered can reduce, and calculate the AD value polluted and also can reduce, alarm threshold value also constantly reduces thereupon.The variation tendency of alarm threshold value is the same with gathering the AD value variation tendency polluted, and proves the feasibility of this algorithm.
(4) active reporting process: in order to verify that detector is in normal operating conditions, and its work state information is uploaded to fire-fighting main frame, smoke alarm in the present invention in the course of the work, detector by wireless radio frequency modules every ten minutes active reporting data, whether data message comprises has the condition of a fire to occur or whether working battery is under-voltage and whether detector is in the information of normal operating conditions, wireless radio frequency modules is while reported data, the pilot lamp of detector is glittering, and reminding user detector is in normal monitoring state.
Further, when the present invention is extractd by artificial or other reasons detector, electrode approach is contacted because mounting base 14 adopts with drain pan 11, when detector is taken away from installation site, contact electrode points 16 disconnects with shell fragment 17, whether single-chip microcomputer detects detector by the level saltus step detecting its I/O port removed, microprocessor detect is less than contact electrode signal, by to detection signal analysis, think that detector is in abnormal operating state, alarm lamp (2) sends warning reminding signal, detector is in abnormal operating state by wireless radio frequency modules and is uploaded to fire-fighting main frame by detector in time, fire-fighting main frame passes through resolution data, just which detector analyzing which building unit and room number that can be very fast is in improper monitored state, removing adopts electrode contact mode of the present invention to realize also adopting tongue tube or Hall element to realize this function.
The present invention adopts wireless communication technique to combine with cigarette sense Detection Techniques, not only can the standalone probe condition of a fire, simultaneously can with fire-fighting host communication, play the effect of fire-fighting link; The pollution treatment method that employing environment substrate value is followed is to the process of smoke signal, due to false alarm that environmental interference causes in timely eliminating labyrinth, housing design adopts electrode contact mode, detector can well be detected in use because artificial origin extracts the unnecessary trouble that detector causes; The present invention adopts 433MHz wireless communication technique, adopts the low-consumption wireless radio frequency chip of the band answer-mode of TI, not only can realize the two-way intercommunication of information, also reduce system power dissipation; Adopt 9V lithium electricity simultaneously, ensure that detector can normally work 6 ~ 8 years in powered battery situation, decrease the trouble that user changes battery.
Claims (5)
1. a wireless optical electric-type smoke alarm, be provided with upper casing (4) from top to bottom successively, circuit board (6), drain pan (11), mounting base (14), it is characterized in that: described upper casing top is provided with key hole (1) and alarm lamp hole (2), the middle position of described circuit board (6) has groove (19), the front of circuit board (6) connects labyrinth (5) by groove (19), described circuit board (6) is fixed on upper casing (4) by setscrew, installing ring (3) is had between circuit board (6) and upper casing (4), described detector drain pan (11) is provided with battery compartment (9), contact electrode points (16), hummer (8), described mounting base (14) central authorities have fixed orifice (13), mounting base (14) is provided with the shell fragment (17) corresponding with contacting electrode points (16), described upper casing (4) is connected by buckle (12) with drain pan (11), described mounting base (14) is connected by joint pin (15) with drain pan (11).
2. a kind of wireless optical electric-type smoke alarm according to claim 1, is characterized in that: the interface of two infrared tubes (18) of described labyrinth (5) is 180 °, and labyrinth (5) upper cover is attached to upper casing (4) inwall.
3. a kind of wireless optical electric-type smoke alarm according to claim 1, it is characterized in that: the reverse side of described circuit board (6) is provided with single-chip microcomputer, AD acquisition module, wireless radio frequency modules, infrared light emitting diode and infrared light reception diode, labyrinth (5), test button, alarm lamp are equipped with in front.
4. a kind of wireless optical electric-type smoke alarm according to claim 3, is characterized in that: described single-chip microcomputer is the MSP430 chip of low-power consumption, and the radio frequency chip in wireless radio frequency modules is the CC1101 of band answer-mode.
5. a kind of wireless optical electric-type smoke alarm according to claim 1, is characterized in that: adopt 9V lithium battery in described battery compartment (9).
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| CN201520454781.1U CN204926392U (en) | 2015-06-29 | 2015-06-29 | Detector is felt to wireless photoelectric type cigarette |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118223A (en) * | 2015-06-29 | 2015-12-02 | 山东北仁汇智能源发展有限公司 | Wireless photoelectric smoke sensing detector |
| CN106441395A (en) * | 2016-11-17 | 2017-02-22 | 天津航联迪克科技有限公司 | Detachable detector for quickly changing labyrinth |
| CN107578598A (en) * | 2017-09-22 | 2018-01-12 | 深圳市中天明智慧消防科技有限公司 | Free-standing photoelectric smoke detecting alarm |
| CN108022407A (en) * | 2017-11-30 | 2018-05-11 | 徐州泰华电子科技有限公司 | A kind of sensor for smoke detection |
| CN108053602A (en) * | 2017-12-19 | 2018-05-18 | 深圳市泛海三江电子股份有限公司 | A kind of pollution prediction method of optical detector of fire smoke and its pollution prediction system |
| CN109448300A (en) * | 2018-12-28 | 2019-03-08 | 上海应用技术大学 | A kind of Multifunction safety siren and its alarm system |
| CN110097731A (en) * | 2019-05-23 | 2019-08-06 | 浙江台谊消防设备有限公司 | A kind of stand alone type smoke alarm |
| CN112614299A (en) * | 2021-01-06 | 2021-04-06 | 桂林电子科技大学 | Stand alone type photoelectric smoke sensing fire detector based on NB IoT |
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2015
- 2015-06-29 CN CN201520454781.1U patent/CN204926392U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118223A (en) * | 2015-06-29 | 2015-12-02 | 山东北仁汇智能源发展有限公司 | Wireless photoelectric smoke sensing detector |
| CN106441395A (en) * | 2016-11-17 | 2017-02-22 | 天津航联迪克科技有限公司 | Detachable detector for quickly changing labyrinth |
| CN106441395B (en) * | 2016-11-17 | 2019-03-26 | 天津航联迪克科技有限公司 | The detachable detector in quick-replaceable labyrinth |
| CN107578598A (en) * | 2017-09-22 | 2018-01-12 | 深圳市中天明智慧消防科技有限公司 | Free-standing photoelectric smoke detecting alarm |
| CN108022407A (en) * | 2017-11-30 | 2018-05-11 | 徐州泰华电子科技有限公司 | A kind of sensor for smoke detection |
| CN108053602A (en) * | 2017-12-19 | 2018-05-18 | 深圳市泛海三江电子股份有限公司 | A kind of pollution prediction method of optical detector of fire smoke and its pollution prediction system |
| CN109448300A (en) * | 2018-12-28 | 2019-03-08 | 上海应用技术大学 | A kind of Multifunction safety siren and its alarm system |
| CN110097731A (en) * | 2019-05-23 | 2019-08-06 | 浙江台谊消防设备有限公司 | A kind of stand alone type smoke alarm |
| CN112614299A (en) * | 2021-01-06 | 2021-04-06 | 桂林电子科技大学 | Stand alone type photoelectric smoke sensing fire detector based on NB IoT |
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