CN108734917A - A method of it prevents water mist from causing the smoke alarm of alarm and its prevents wrong report - Google Patents
A method of it prevents water mist from causing the smoke alarm of alarm and its prevents wrong report Download PDFInfo
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- CN108734917A CN108734917A CN201810620070.5A CN201810620070A CN108734917A CN 108734917 A CN108734917 A CN 108734917A CN 201810620070 A CN201810620070 A CN 201810620070A CN 108734917 A CN108734917 A CN 108734917A
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- alarm
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
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- Emergency Management (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a kind of smoke alarms for preventing water mist from causing alarm, including alarm ontology, smog labyrinth is equipped in alarm ontology, alarm ontology connects controller, central processor unit MCU is equipped in controller, central processor unit MCU connects relative humidity sensor by humidity sensor drive module, relative humidity sensor measures the relative humidity of alarm ontology local environment, its output signal end is connect with central processor unit MCU, periodically provides envionmental humidity data to central processor unit MCU.It prevents water mist from causing the method for smoke alarm wrong report, includes the following steps：Central processor unit MCU starts before acousto-optic warning unit, using the reading of relative humidity sensor, water mist is examined to there is a possibility that and triggering alarm signal, if it is determined that the dense degree of water mist has reached the degree of triggering smog alarm, it then prevents to start acousto-optic warning unit, avoids reporting by mistake.
Description
Technical field
The present invention relates to fire-fighting smoke sensing field, especially a kind of smoke alarm for preventing water mist from causing alarm and
It prevents the method for wrong report.
Background technology
In fire-fighting domain, smoke sensor is the first defence line for detecting fire.Based on its importance, fire chief unit is issued
Country's mark of cloth GB20517-2006 stand alone type smoke sensing alarms and GB4517-2007 point type smoke sensing alarms
It is accurate.It is every that the smoke sensing alarm peddled is disclosed within Chinese territory, it is necessary to according to one in both national standards according to law
Kind, pass through the detection and certification of responsible institution.Any building, only using the smoke sensing alarm for holding legitimate authentication,
After installation is complete, legal use license could be obtained by the inspection of local fire brigade 5.
But for a long time, even by the smoke sensing alarm of regular certification, whether point type or it is independent
Formula, no doubt there is enough sensitivity to smog, be capable of providing rational protection, but there are still be easy lacking for wrong report
It falls into, great inconvenience is brought for consumer.
In terms of wrong report, what especially behaviour denounced is by the wrong report caused by water mist.This is because being built in one family
Among, the probability that water mist occurs is much larger than the possibility that smog occurs；And the frequency that water mist occurs is hundred times of smog, thousand times
Even ten thousand times or more.And the howling of high-decibel is enough to shift people into the edge of nervous breakdown onto if continuing when alarming.
The smoke sensing alarm designs of a part have the button for closing alert audio signal, allow user can be in wrong report
Cut off alarm sound.But due to regulation of the smoke sensing alarm according to national standard, the day for being all mounted on room is taken, so normally
The people of height can not possibly directly touch mute button with hand.Usual consumer can handle asking for noise reduction with two methods below
Topic.First is to attempt to contact mute button with a waddy.This method is more unreliable, because mute button generally contacts
Area is smaller, it is necessary to repeatedly attempt just have successful possibility.This limit for tolerating continuing challenge consumer.The another kind of user
Solution is to bring chair or stool, then climbs up and presses mute button with hand.This method is although reliable, still
There are enough cases to show, older, which is easy to fall from chair, stool, to come, and may not only cause injury, in some instances it may even be possible to disable.Moreover, disappearing
When restore alert capability after sound, just can guarantee and reach when fire occurs and alarm and one very intractable ask
Topic.It is obvious that noise reduction can only be as supplementary means, and how to increase the intelligence of smoke sensing alarm, fundamentally reduce, very
It is reported by mistake to caused by elimination water mist, is only the method put things right once and for all for solving water mist wrong report；
" the free-standing smoke sensing alarm " and " point type smoke sensing alarm " peddled currently on the market is almost complete
Portion is the photo-electric type smoke detector using light scattering principle.Specifically, there are one the spaces of special designing for this kind of equipment, empty
Gas can carry smoke particle according to the type of flow of design and pass through this space.The type of flow referred herein includes：Air
The aerodynamic parameters such as flow, flow direction, flow-disturbing pattern also include the parameters such as size, the weight for carrying smoke particle.This
Space generally use light-absorbing black material, and geometry is constituted, entirely prevent the light source of extraneous dropping fire to enter.Industry is usual
This space is referred to as " labyrinth ".This design is to ensure that, when air cleaning in labyrinth, receiver can never receive foot
Enough light sources cause wrong report phenomenon.And when combustion fumes enter labyrinth with air, light source is mapped to smoke particle and generates scattering,
So that a part of light source scattering enters receiver guide lighting channel.Scattering enters the light source of receiver guide lighting channel, as smog is dense
The increase of degree and increase.When the concentration of combustion fumes reaches a certain level, the luminous intensity of receiver is reached just because of scattering
It is enough to trigger alarm signal, here it is the operation principles of smoke sensing alarm on consumption market.
For " free-standing smoke sensing alarm " and " point type smoke sensing alarm ", after being detected by national standard,
As long as particle reaches the concentration of foundation when national standard is formulated in air, alarm will be triggered.If these particles are combustion fumes
Grain, then this alarm is exactly successful fire alarm.
But scattering can be caused to infrared light supply is not only combustion fumes.Such as the water that supersaturation water steam is formed
The smog that mist or other reasons generate also can result in the scattering of sufficient amount, cause alarm signal, this has resulted in wrong report.And
In everyday home life, there is a large amount of activity (such as make food, take a shower) to will produce water mist daily, if caused every time
Wrong report will result in great inconvenience.
Invention content
The purpose of the present invention is to solve defects of the existing technology, provide a kind of cigarette for preventing water mist from causing alarm
Fog siren.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of smoke alarm for preventing water mist from causing alarm, including alarm ontology, alarm ontology is interior to be equipped with smog
Labyrinth, alarm ontology are equipped with the tubulose guide lighting channel being connected to smog labyrinth and receiver guide lighting channel, and tubulose leaded light is logical
Directional light is disposed in road, disposes directional light receiver in receiver guide lighting channel, directional light and directional light connect
The installation for receiving device axially intersects, and directional light receiver cannot directly receive the light beam of directional light；
The alarm ontology connects controller, and central processor unit MCU, the base of alarm ontology are equipped in controller
This structure is traditional scattering formula smoke detection alarm, and internal central processor unit MCU reaches national standard in surrounding enviroment
When the defined smokescopes of GB20517 or national standard GB4517, i.e., generate " reflecting material concentration reaches alarm criteria " letter in inside
Number.
Central processor unit MCU connects acousto-optic warning unit, acousto-optic warning unit packet by sound-light alarm drive module
Buzzer and visible light emitting diode are included, central processor unit MCU connects relatively wet by humidity sensor drive module
Sensor is spent, relative humidity sensor measures the relative humidity of alarm ontology local environment, output signal end and alarm
The central processor unit MCU connections of ontology periodically provide envionmental humidity data to central processor unit MCU.
Further, the directional light is infrared light-emitting diode, and the directional light receiver is photodiode.
Further, central processor unit MCU connects two pole of infraluminescence by LED driving module and conducting wire
Pipe, central processor unit MCU by photodiode drive module and conducting wire connect photodiode and obtaining receive it is photosensitive
Whether enough the signal that diode is received from smog labyrinth judges smokescope triggering alarm.
Further, the relative humidity sensor is mounted on the bottom in the smog labyrinth.
Further, the bottom lock in the smog labyrinth, the top in smog labyrinth and surrounding are open or there are channel, allow sky
Gas is passed in and out according to the design in channel.
Further, the periphery in the smog labyrinth has tortuous blade, the tubulose guide lighting channel and receiver leaded light logical
The top in road is equipped with sloping baffle, and bottom is equipped with the fixed plate of fixed infrared light-emitting diode and photodiode, two inclinations
Baffle intersects and blocks the light beam of infrared light-emitting diode.
A method of prevent water mist from causing smoke alarm wrong report, steps are as follows：Central processor unit MCU starting sounds
Before light alarm unit, using the reading of relative humidity sensor, examines water mist there is a possibility that and trigger alarm signal, such as
Fruit determines that the dense degree of water mist has reached the degree of triggering smog alarm, then prevents to start acousto-optic warning unit, avoid reporting by mistake；Such as
Fruit not can determine that the dense degree of water mist has reached the degree of triggering smog alarm, then central processor unit MCU will be according to normal
Alarming logic starts alarm flow.
Further when the signal strength of photodiode drive module triggers alarm enough, central processor unit MCU
Intelligence programming further search the data and historical data of humidity sensor drive module, judge photodiode drive module
Signal whether be wrong report.
Further, when the signal that central processor unit MCU is received is more than alarm critical value, if without other preventions
Signal to sound-light alarm drive module send out sound-light alarm instruction, the instruction received is changed by sound-light alarm drive module holds
Horizontal electrical signal and the order for driving acousto-optic warning unit execution sound and light to alarm.
Beneficial effects of the present invention are：The directional light and directional light receiver of the smoke alarm are in certain angle
Degree intersection, directional light receiver cannot directly receive the light beam of directional light, and particle concentration does not reach alarm in air
When standard, the light source that directional light receiver is unlikely to receive other than scattering causes to report by mistake, reports by mistake in order to prevent, central processing unit
Unit MCU connects relative humidity sensor by humidity sensor drive module, and relative humidity sensor is mounted on the smog
The bottom in labyrinth, the intelligence of central processor unit MCU when the signal strength of photodiode drive module triggers alarm enough
The data and historical data that can further search humidity sensor drive module can be programmed, judge photodiode drive module
Whether signal is wrong report, and the possibility of wrong report is effectively made significantly to decline.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
The controller inner function module structural schematic diagram of Fig. 2 smoke sensing alarms；
Fig. 3 is the curve record schematic diagram that relative humidity sensor of the present invention is individually tested；
Fig. 4 is Physical Experiment schematic diagram of the present invention；
Fig. 5 is logic flow schematic diagram of the present invention.
Specific implementation mode
The present invention is described in further detail with specific implementation mode with reference to the accompanying drawings of the specification.
As shown in Figures 1 to 5, prevent water mist from causing the smoke alarm of alarm, including alarm ontology 101, alarm
Smog labyrinth 100 is equipped in ontology 101, alarm ontology 101 is equipped with the tubulose guide lighting channel being connected to smog labyrinth 100
102 and receiver guide lighting channel 103, directional light 104 is disposed in tubulose guide lighting channel 102, in receiver guide lighting channel 103
Directional light receiver 105 is disposed, the installation of directional light 104 and directional light receiver 105 axially intersects, this hair
In bright, the bottom lock in smog labyrinth 100, the top in smog labyrinth 100 and surrounding are open or there are channels, allow air according to logical
The design in road passes in and out.The periphery in smog labyrinth 100 has tortuous blade 120, the mainly external other light sources of isolation to enter.In this way
On the one hand effective scattered energy could be controlled, on the other hand then can be with specification air flow parameters, tubulose guide lighting channel 102
It is equipped with sloping baffle 110 with the top of receiver guide lighting channel 103, bottom is equipped with fixed infrared light-emitting diode and photosensitive two pole
The fixed plate 111 of pipe, two sloping baffles 110 intersect and block the light beam of infrared light-emitting diode, and this design is to want
Ensure when air cleaning in labyrinth, directional reception device 105 can never receive enough light sources, cause wrong report phenomenon.
And when combustion fumes enter smog labyrinth 100 with air, light source is mapped to smoke particle and generates scattering so that a part of light source dissipates
It injects into receiver guide lighting channel 103.Scattering enters the light source of receiver guide lighting channel 103, with the increase of smokescope
Increase.When the concentration of combustion fumes reaches a certain level because scattering and the luminous intensity of arrival direction receiver 105 just foot
To trigger alarm signal.
Further, in the present invention, directional light 104 is infrared light-emitting diode, and directional light receiver 105 is photosensitive
Diode.
Alarm ontology 101 connects controller 200, and central processor unit MCU201 is equipped in controller 200,
The basic structure of alarm ontology is traditional scattering formula smoke detection alarm, internal central processor unit
MCU generates " reverberation when surrounding enviroment reach the defined smokescope of national standard GB20517 or national standard GB4517 in inside
Matter concentration reaches alarm criteria " signal, central processor unit MCU201 passes through LED driving module 202 and conducting wire
107 connection infrared light-emitting diodes, central processor unit MCU201 pass through photodiode drive module 203 and conducting wire 108
Connection photodiode simultaneously obtains the signal that reception photodiode is received from smog labyrinth 100, whether judges smokescope
Triggering alarm enough.
Further, central processor unit MCU201 connects acousto-optic warning unit by sound-light alarm drive module 204
106, acousto-optic warning unit 106 includes buzzer and visible light emitting diode, when the signal that central processor unit MCU is received
When more than alarm critical value, if without the signal of other preventions, sound-light alarm instruction, sound are sent out to sound-light alarm drive module
The instruction received is changed by light alarm drive module to be executed electric signal and drives acousto-optic warning unit 106 to hold by conducting wire 109
The order of row sound and light alarm.
For " free-standing smoke sensing alarm " and " point type smoke sensing alarm ", after being detected by national standard,
As long as particle reaches the concentration of foundation when national standard is formulated in air, alarm will be triggered.If these particles are combustion fumes
Grain, then this alarm is exactly successful fire alarm.
But scattering can be caused to infrared light supply is not only combustion fumes.Such as the water that supersaturation water steam is formed
The smog that mist or other reasons generate also can result in the scattering of sufficient amount, cause alarm signal, this has resulted in wrong report.And
In everyday home life, there is a large amount of activity (such as make food, take a shower) to will produce water mist daily, if caused every time
Wrong report will result in great inconvenience.
Because smog labyrinth can not judge whether the particle entrained by air is water mist, the purpose of the present invention is exactly to carry thus
For independent judgement information, the possibility of wrong report is greatly reduced.
But mandatory declaration：Other than scattering formula photoelectric mist sensing alarm, also grasped according to other operation principles
The smoke sensing alarm of work, such as dim light formula photoelectric mist sensing alarm and ion type smog sense alarm.These set
Although standby may sense precision aspect advantageously, due to that can not coordinate physically or on production cost
Or meet consumer needs, so can not occupy a tiny space on consumption market.The present invention is not application with these class products
Target.
The specific implementation method of the present invention is as follows：
Further, central processor unit MCU201 connects relative humidity sensing by humidity sensor drive module 205
Device 121, relative humidity sensor 121 are mounted on the bottom position in smog labyrinth 100, and the position of relative humidity sensor 121 must
It must enable it to receive and air draught as labyrinth type.In such a situa-tion, it just can guarantee synchronous in time domain
Measure the rh value near labyrinth and the scattered energy value in smog labyrinth.
Before central processor unit MCU201 starts acousto-optic warning unit 106, using the reading of relative humidity sensor 121
Number examines water mist to there is a possibility that and triggering alarm signal, if it is determined that the dense degree of water mist has reached triggering smog alarm
Degree, then prevent start acousto-optic warning unit 106, avoid reporting by mistake；If not can determine that the dense degree of water mist has reached triggering
The degree of smog alarm, then central processor unit MCU201 will be according to Normal Alarm logic, startup alarm flow.
Relative to traditional smoke sensing alarm, controller 200 increases humidity sensor drive module in the present invention
205.Ambient humidity measured by relative humidity sensor 121 enters humidity sensor drive module 205, so by conducting wire 122
It is converted into the readable signal of central processor unit MCU201 afterwards.
Further, when the signal strength of photodiode drive module 203 triggers alarm enough, central processor unit
The intelligence programming of MCU201 can further search the data and historical data of humidity sensor drive module 205, judge photosensitive two
Whether the signal of pole pipe drive module 203 is wrong report, wherein the model BL151F3PB of central processor unit MCU201.
Fig. 3 is the curve record that typical relative humidity sensor is individually tested.Vertical axis in figure is relative humidity
Reading, as unit of %.Horizontal axis is the time in figure, with " minute " timing.From curve as can be seen that in experiment 301 (0-11 of initial stage
Minute), water mist generates not yet, so stable reading rests near 57%.As the phase 302 (11-20 minutes) occurs for water mist,
Reading, which rapidly rises, reaches 90% or more.In water mist duration 303 (20-36 minutes), stable reading maintains 90% or more.?
Water mist disappears the phase 304
(36-60 minutes), reading continue to decline, and are finally stable at 60%.Slightly above test the reading at initial stage 301.
When continuing this experiment, experiment curv above-mentioned as shown in the figure can be in periodically to occur.This is turned out relatively
The stability and reliability of humidity sensor, it is sufficient to as the foundation for correcting wrong report.
Fig. 4 is the physical arrangement of this experiment.
The purpose of the present invention is improvement " free-standing smoke sensing alarm " and " point type smoke sensing alarms " daily
Wrong report problem in life, so the physical arrangement of experiment must reflect the operating process of daily life.To this experimental situation
The arrangement of analog kitchen is selected.
During the experiment, electric furnace 401 is warming-up device, and heat source is provided for container 402.Container 402 has lid 406, is used for
Control the switch of vapor.Relative humidity sensor 403 is mounted on the top of container 402, and distance can be according to 401 heat supply of electric furnace
The capacity of ability and container 402 adjusts.Specific method is with the dense degree of water mist that relative humidity sensor 403 touches and kitchen
Middle food steamer is similar for adjustment reference when uncapping.The reading of relative humidity sensor 403 is recorded by PC machine 404.Many experiments
Afterwards by analysis, conclude, the data and curves of Fig. 3 are their Typical Representatives.
The method that this equipment prevents wrong report, steps are as follows：Central processor unit MCU201 starts acousto-optic warning unit 106
Before, using the reading of relative humidity sensor 121, water mist is examined to there is a possibility that and triggering alarm signal, if it is determined that
The dense degree of water mist has reached the degree of triggering smog alarm, then prevents to start acousto-optic warning unit 106, avoid reporting by mistake；If
It not can determine that the dense degree of water mist has reached the degree of triggering smog alarm, then central processor unit MCU will be according to normal report
Alert logic, starts alarm flow.
When the signal strength of photodiode drive module 203 triggers alarm enough, central processor unit MCU201
Intelligence programming further search the data and historical data of humidity sensor drive module 205, judge that photodiode drives
Whether the signal of module 203 is wrong report.
When the signal that central processor unit MCU201 is received is more than alarm critical value, if without the letter of other preventions
Number to sound-light alarm drive module send out sound-light alarm instruction, the instruction received is changed by sound-light alarm drive module executes electricity
Signal and the order for driving 106 execution sound of acousto-optic warning unit and light to alarm.
By experiment, normal false-positive detection flow is described as follows：
When enough water mist rises to the height up to smoke sensing alarm, wherein smoke sensing module will be triggered, is sent out
Signal notifies central processor unit MCU201.According to the design of photoelectric smoke alarms all currently on the market, centre
Reason device unit MCU201 can start acousto-optic warning unit 106, flash and the alarm song of high-decibel.Here it is water mist wrong reports
Origin.
The present invention will be before central processor unit MCU201 can start acousto-optic warning unit 106, using relative humidity
The reading of sensor 201 coordinates Fig. 3 experimental datas, according to the logic flow of Fig. 5, is suitable for smoke detection module and indicates
The smog more than critical value is detected, wherein：
● RH (relative humidity):High (1)/low (0)
● SD (measures smog):It is (1)/no (0)
● AA (starting alarm)=SD and (not RH)
●RHC:Relative humidity at present
●RHR:Relative humidity reference value
● DRH=RHC-RHR
●RH0:1 sampling in relative humidity
●RH1:2 samplings in relative humidity
●RH2:3 samplings in relative humidity
●RHT:Sampling time interval
●SD0:Smoke Detection state at present
●SD-1:Previous Smoke Detection state
●SDF:Smoke Detection state transition, SDF=SD0 xor SD-1
According to logic flow Fig. 5, water mist is examined to there is a possibility that and triggering alarm signal.If it is determined that the dense degree of water mist
The degree for having reached triggering smog alarm then prevents to start acousto-optic warning unit 106, avoids reporting by mistake.If not can determine that water
Mistiness density has reached the degree of triggering smog alarm, and central processor unit MCU201 will be opened according to Normal Alarm logic
Dynamic alarm flow.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of smoke alarm for preventing water mist from causing alarm, including alarm ontology, alarm ontology is interior to be equipped with smog fan
Palace, which is characterized in that the alarm ontology connects controller, and central processor unit MCU, central processing are equipped in controller
Device unit MCU connects relative humidity sensor by humidity sensor drive module, and relative humidity sensor measures alarm sheet
The relative humidity of body local environment, output signal end are connect with central processor unit MCU, periodically to central processor unit
MCU provides envionmental humidity data.
2. a kind of smoke alarm for preventing water mist from causing alarm according to claim 1, which is characterized in that alarm sheet
Body is equipped with the tubulose guide lighting channel being connected to smog labyrinth and receiver guide lighting channel, and directionality is disposed in tubulose guide lighting channel
Light source, receiver guide lighting channel is interior to dispose directional light receiver, the installation of directional light and directional light receiver axial
It intersects, directional light receiver cannot directly receive the light beam of directional light；Central processor unit MCU passes through sound
Light alarm drive module connects acousto-optic warning unit, and acousto-optic warning unit includes buzzer and visible light emitting diode.
3. a kind of smoke alarm for preventing water mist from causing alarm according to claim 1, which is characterized in that the direction
Property light source be infrared light-emitting diode, the directional light receiver be photodiode.
4. a kind of smoke alarm for preventing water mist from causing alarm according to claim 3, which is characterized in that central processing
Device unit MCU connects infrared light-emitting diode by LED driving module and conducting wire, and central processor unit MCU passes through
Photodiode drive module and conducting wire connection photodiode simultaneously obtain what reception photodiode was received from smog labyrinth
Whether enough signal judges smokescope triggering alarm.
5. a kind of smoke alarm for preventing water mist from causing alarm according to claim 1, which is characterized in that described opposite
Humidity sensor is mounted on the bottom in the smog labyrinth.
6. a kind of smoke alarm for preventing water mist from causing alarm according to claim 3, which is characterized in that the smog
The bottom lock in labyrinth, the top in smog labyrinth and surrounding are open or there are channels, and air is allowed to be passed in and out according to the design in channel.
7. a kind of smoke alarm for preventing water mist from causing alarm according to claim 6, which is characterized in that the smog
There is a tortuous blade on the periphery in labyrinth, and the top of the tubulose guide lighting channel and receiver guide lighting channel is equipped with sloping baffle, bottom
Portion is equipped with the fixed plate of fixed infrared light-emitting diode and photodiode, and two sloping baffles intersect and block infrared hair
The light beam of optical diode.
8. a kind of method for preventing water mist from causing smoke alarm wrong report, which is characterized in that include the following steps：The centre
Before managing device unit MCU startup acousto-optic warning units, using the reading of relative humidity sensor, examines water mist to exist and reported with triggering
The possibility of alert signal, if it is determined that the dense degree of water mist has reached the degree of triggering smog alarm, then prevents to start acousto-optic report
Alert unit, avoids reporting by mistake；If not can determine that the dense degree of water mist has reached the degree of triggering smog alarm, central processing unit
Unit MCU will start alarm flow according to Normal Alarm logic.
9. preventing water mist from causing the method for smoke alarm wrong report according to claim 8, which is characterized in that when photosensitive two pole
When the signal strength of pipe drive module triggers alarm enough, the intelligence programming of central processor unit MCU further searches humidity
The data and historical data of sensor drive module judge whether the signal of photodiode drive module is wrong report.
10. preventing water mist from causing the method for smoke alarm wrong report according to claim 8, which is characterized in that work as centre
When the signal that reason device unit MCU is received is more than alarm critical value, if the signal without other preventions drives mould to sound-light alarm
Block sends out sound-light alarm instruction, and the instruction received is changed by sound-light alarm drive module to be executed electric signal and drive sound-light alarm
The order of unit execution sound and light alarm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718036A (en) * | 2019-10-16 | 2020-01-21 | 中国计量大学 | Photoelectric smoke detection alarm based on Internet of things |
| WO2021237502A1 (en) * | 2020-05-27 | 2021-12-02 | 深圳市泛海三江电子股份有限公司 | Fire detector for preventing false alarms and method of use |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110718036A (en) * | 2019-10-16 | 2020-01-21 | 中国计量大学 | Photoelectric smoke detection alarm based on Internet of things |
| CN110718036B (en) * | 2019-10-16 | 2021-02-05 | 中国计量大学 | Photoelectric smoke detection alarm based on Internet of things |
| WO2021237502A1 (en) * | 2020-05-27 | 2021-12-02 | 深圳市泛海三江电子股份有限公司 | Fire detector for preventing false alarms and method of use |
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Application publication date: 20181102 |