CN106710127A - Independent type photoelectric smoke sensing fire alarm device and working method - Google Patents
Independent type photoelectric smoke sensing fire alarm device and working method Download PDFInfo
- Publication number
- CN106710127A CN106710127A CN201710056107.1A CN201710056107A CN106710127A CN 106710127 A CN106710127 A CN 106710127A CN 201710056107 A CN201710056107 A CN 201710056107A CN 106710127 A CN106710127 A CN 106710127A
- Authority
- CN
- China
- Prior art keywords
- alarm
- photoelectric smoke
- smog
- processing unit
- housing case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 5
- 235000019504 cigarettes Nutrition 0.000 claims description 10
- 239000000428 dust Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G01N15/075—
Abstract
The invention discloses an independent type photoelectric smoke sensing fire alarm device and a working method. A detection cavity is arranged in an outer cover shell; a multistage annular perpendicular stepped smoke feeding structure is arranged outside the outer cover shell, and is provided with double rows of through holes; an alarm is arranged in the detection cavity, and comprises a signal processing unit, an infrared light-emitting diode, an infrared light-receiving diode, an indicator light and a loudspeaker; the infrared light-emitting diode, the infrared light-receiving diode, the indicator light and the loudspeaker are connected to the signal processing unit. According to the independent type photoelectric smoke sensing fire alarm device and the working method provided by the invention, an innovative structure with a stepped parting surface and double rows of through holes is adopted, so that non-sustainable smog can be diffused quickly. Through acquiring smoke particle number and light scattering strength, the smog concentration and the particle size are judged, and a concentration threshold of the smog is set, so that fire alarm factors such as sustainable smog can be effectively responded, and accidental alarm is avoided.
Description
Technical field
The present invention relates to fire safety protecting field, more particularly to a kind of free-standing photoelectric smoke alarm and work
Method.
Background technology
Free-standing photoelectric smoke alarm has anti-interference in air flow, and working stability, environment temperature and humidity change are right
The features such as it influences small, the response to canescence and the larger cigarette that glows of particle is sensitive, and simple structure, easy for installation, cost
It is cheap, it is widely used in common furniture construction, Step section, hotel, compact entertainment place and processing factory etc..
Main sensor cluster (transmitting tube, the reception by detection smoke particle of free-standing photoelectric smoke alarm
Pipe), carry out signal transacting wiring board, provide the sound indicate buzzer, provide light indicate indicator lamp and power supply battery
Device is constituted.After smoke particle enters light electric maze, scattering is produced to infrared emission light, scattering light is connect by photodiode
Receive, and then produce faint photoelectric current.Photoelectric current is converted and amplifying circuit treatment after, obtain photo-current intensity and smokescope it
Between relation.The sensitivity of alarm is adjusted by setting alarm threshold value.Wherein, the smokescope for entering labyrinth is responded not
Easy to control, such as low concentration smog residence time is long, is vulnerable to the influence of noncontinuity smog and produces wrong report.Meanwhile, pass through
Photo-current intensity judges the type of smoke particle and analyzes to obtain accurate smokescope, and then determines smoke density threshold value
It is difficult.
At present, most of photoelectric smoke alarms enter the parameters such as smokescope, the smoke particle size of alarm
Judge inaccurate or be not identified, cause low concentration smog to disturb wrong report and dust granules interference wrong report, greatly reduce report
The sensitivity of alert device.
The content of the invention
The purpose of the present invention is that design is a kind of solves low concentration smog and dust granules interference wrong report, the fire of dependable performance
Alarm.
For achieving the above object, the technical scheme is that：A kind of free-standing photoelectric smoke alarm, bag
Taper type housing case is included, housing case inside is detection chamber, and it is vertical that housing case outer cone inclined-plane is provided with multi-stage annular
Staged enters cigarette structure, enters and equally distributed double through hole is offered on the vertical cascaded surface of cigarette structure, and double through hole is through outer
Over body case connection detection chamber；
Alarm is provided with the detection cavity room, alarm is arranged on the bottom surface of housing case, and alarm is included at signal
Reason unit, the signal processing unit includes using low-power consumption and carries the chip of operational amplifier function；Alarm also includes along same
Infrared transmitting tube and infrared receiving tube that the radial direction angle of covering of the fan is set, infrared receiving tube receive infrared transmitting tube transmitting through cigarette
The infrared ray of mist particle scattering；Alarm also includes indicator lamp and loudspeaker；The infrared transmitting tube, infrared receiving tube, indicator lamp
Signal processing unit is connected to loudspeaker.
The method of work of stand alone type photoelectric smoke alarm of the invention, by corpuscular counter, infrared transmitting tube, red
Outer reception pipe detects smoke particle number and light scatter intensity, and signal processing unit is analyzed calculating to judge smokescope and grain
Sub- size, determines threshold, judges whether fire with this, and send warning by indicator lamp and loudspeaker.
As it is of the invention it is a kind of preferably, signal processing unit by the functional relation of smoke particle Particle density and time come
Determine smokescope.
As it is of the invention it is another preferably signal processing unit is based on light scattering theory, by scattering strength function, really
Determine particle size.
The beneficial effects of the invention are as follows：
The innovation structure of staged facet of the present invention and double through hole, is capable of achieving the rapid diffusion to non-standing smog.
By gathering smoke particle number and light scatter intensity, smokescope and particle size are judged, concentration threshold setting is carried out to smog,
More effectively the fire alarm factor such as continuation smog is responded, it is to avoid wrong report.
Brief description of the drawings
Fig. 1 is the structural representation of housing case of the invention 1；
Fig. 2 is the structural representation of alarm of the invention 2；
Fig. 3 is light scatter intensity detects schematic diagram of the invention.
Specific embodiment
The technical scheme in the embodiment of the present invention is clearly and completely described below in conjunction with accompanying drawing.
As shown in Figure 1, 2, a kind of free-standing photoelectric smoke alarm, including taper type housing case 1, housing case
1 inside is detection chamber (not shown), and the outer cone inclined-plane of housing case 1 is provided with multi-stage annular vertical riser formula and enters cigarette knot
Structure 101, enters and equally distributed double through hole 103 is offered on the vertical cascaded surface 102 of cigarette structure 101, and double through hole 103 runs through
Housing case connection detection chamber, it is beneficial to low concentration smog that staged enters cigarette structure 101 and the Main Function of double through hole 103
Rapidly enter and diffuse into detection chamber.
Alarm 2 is provided with the detection cavity room, alarm 2 is arranged on the bottom surface of housing case 1, and alarm 2 includes letter
Number processing unit 201, the signal processing unit 201 includes using low-power consumption and carries the chip of operational amplifier function and (do not show in figure
Go out).Alarm also includes indicator lamp 204 and loudspeaker 205.
Alarm 2 also includes the infrared receiving tube for launching ultrared infrared transmitting tube 202 and receiving infrared-ray
203, as shown in figure 3, infrared transmitting tube 202 and infrared receiving tube 203 are set along the radial direction angle theta of same covering of the fan, the present embodiment
Middle θ takes 135 °.Infrared receiving tube 202 receives the infrared ray scattered through smoke particle of the transmitting of infrared transmitting tube 203.
The infrared transmitting tube 202, infrared receiving tube 203, indicator lamp 204 and loudspeaker 205 are connected to signal transacting list
Unit 201.
Stand alone type photoelectric smoke alarm of the invention, cigarette is detected by infrared transmitting tube 202, infrared receiving tube 203
Droplet subnumber and light scatter intensity, signal processing unit 201 are analyzed calculating to judge smokescope and particle size, it is determined that
Threshold, judges whether fire, and send warning by indicator lamp and loudspeaker with this.Pass based on smoke particle number Yu time
Being principle determines smokescope, and the principle that different size particle diameter is responded to light scatter intensity distinguishes dust and smog
Particle, further improves the sensitivity of alarm.
Wherein, signal processing unit determines smokescope by the functional relation of smoke particle Particle density and time.It is first
First, according to testing result, the functional relation of smoke particle Particle density and time is set up, is then converted to by signal processing unit
Relation between smokescope and pulse amplitude.
Because the dynamic changing process of smoke particle concentration is increased rapidly to after maximum from 0 and gradually decays, i.e., at certain
Individual t smoke particle concentration is up to peak value.Therefore, the relation of smokescope and time is passed through a piecewise function by us
Represent：
In formula (1)：n0It is the maximum of smokescope, b can reflect the speed degree that smokescope changes with time t, t0Table
Show that smoke particle concentration reaches the peak value corresponding time.
Wherein, based on light scattering theory, signal processing unit determines particle size by scattering strength function.According to Mie
Light scattering theory, after incident illumination is mapped to smoke particle, its scattered light intensity I is：
In formula (2), λ is incidence wave wavelength, and R is distance of the receiving point to scattering particles, i1(θ)、i2(θ) is scattering strength
Function.Set up i1(θ)、i2Relation between (θ) and particle size r, can obtain the scattering strength function under different r changes.Demodulation
To smokescope.By parameter setting, threshold value is adjusted, the smoke particle response of setting value is only reached to particle diameter, more than setting value
Smoke particle be not responding to, smoke particle of the particle size in setting value or so can be distinguished, signal in the pickup unit interval
Distribution Value, by the method for probability statistics, according to Malenkov criterion, by software dynamic calculation, finally, obtain finite concentration and
The corresponding threshold signal of particle diameter smoke particle reduces interference of the dust to alarm so as to distinguish dust and smoke particle.
Described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Claims (4)
1. a kind of free-standing photoelectric smoke alarm, it is characterised in that including taper type housing case, inside housing case
It is detection chamber, housing case outer cone inclined-plane is provided with multi-stage annular vertical riser formula and enters cigarette structure, enters the vertical of cigarette structure
Equally distributed double through hole is offered on cascaded surface, double through hole is through housing case connection detection chamber；
Alarm is provided with the detection cavity room, alarm is arranged on the bottom surface of housing case, and alarm includes signal transacting list
Unit, the signal processing unit includes using low-power consumption and carries the chip of operational amplifier function；Alarm also includes along same covering of the fan
Radial direction angle set infrared transmitting tube and infrared receiving tube, infrared receiving tube receive infrared transmitting tube transmitting through smog
The infrared ray of grain scattering；Alarm also includes indicator lamp and loudspeaker；The infrared transmitting tube, infrared receiving tube, indicator lamp and loudspeaker
Be connected to signal processing unit.
2. the method for work of free-standing photoelectric smoke alarm according to claim 1, it is characterised in that by red
Emission pipe, infrared receiving tube detection smoke particle number and light scatter intensity, signal processing unit are analyzed calculating to judge
Smokescope and particle size, determine threshold, judge whether fire with this, and send warning by indicator lamp and loudspeaker.
3. the method for work of free-standing photoelectric smoke alarm according to claim 2, it is characterised in that at signal
Reason unit determines smokescope by the functional relation of smoke particle Particle density and time.
4. the method for work of free-standing photoelectric smoke alarm according to claim 2, it is characterised in that at signal
Reason unit is based on light scattering theory, by scattering strength function, determines particle size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710056107.1A CN106710127A (en) | 2017-01-25 | 2017-01-25 | Independent type photoelectric smoke sensing fire alarm device and working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710056107.1A CN106710127A (en) | 2017-01-25 | 2017-01-25 | Independent type photoelectric smoke sensing fire alarm device and working method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106710127A true CN106710127A (en) | 2017-05-24 |
Family
ID=58909758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710056107.1A Pending CN106710127A (en) | 2017-01-25 | 2017-01-25 | Independent type photoelectric smoke sensing fire alarm device and working method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106710127A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107437320A (en) * | 2017-09-15 | 2017-12-05 | 福建三鲸消防技术研究院有限公司 | A kind of intelligent free-standing smoke sensitive fire hazard detection alarm and its alarm method |
| CN108389357A (en) * | 2018-04-17 | 2018-08-10 | 吉林省威科拓科技有限公司 | A kind of intelligent smog warning system |
| CN110322658A (en) * | 2019-08-02 | 2019-10-11 | 四川赛科安全技术有限公司 | A kind of top formula is reversely into cigarette labyrinth structure and its implementation |
| CN113516824A (en) * | 2021-04-14 | 2021-10-19 | 汉威科技集团股份有限公司 | Composite fire detector and detection method thereof |
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| GB0300067D0 (en) * | 2003-01-03 | 2003-02-05 | Appleby David | Fire detector with low false alarm rate |
| CN201965725U (en) * | 2011-01-20 | 2011-09-07 | 河北北大青鸟环宇消防设备有限公司 | Smoke inlet structure of photoelectric smoke detector |
| CN104200606A (en) * | 2014-07-18 | 2014-12-10 | 中国科学技术大学 | Point-shaped light scattering type smoke detector without optical labyrinth, and signal processing method |
| CN206421541U (en) * | 2017-01-25 | 2017-08-18 | 福建工程学院 | A kind of free-standing photoelectric smoke alarm |
-
2017
- 2017-01-25 CN CN201710056107.1A patent/CN106710127A/en active Pending
Patent Citations (4)
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| GB0300067D0 (en) * | 2003-01-03 | 2003-02-05 | Appleby David | Fire detector with low false alarm rate |
| CN201965725U (en) * | 2011-01-20 | 2011-09-07 | 河北北大青鸟环宇消防设备有限公司 | Smoke inlet structure of photoelectric smoke detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107437320A (en) * | 2017-09-15 | 2017-12-05 | 福建三鲸消防技术研究院有限公司 | A kind of intelligent free-standing smoke sensitive fire hazard detection alarm and its alarm method |
| CN108389357A (en) * | 2018-04-17 | 2018-08-10 | 吉林省威科拓科技有限公司 | A kind of intelligent smog warning system |
| CN110322658A (en) * | 2019-08-02 | 2019-10-11 | 四川赛科安全技术有限公司 | A kind of top formula is reversely into cigarette labyrinth structure and its implementation |
| CN110322658B (en) * | 2019-08-02 | 2024-01-30 | 四川赛科安全技术有限公司 | Top type reverse smoke inlet labyrinth structure and implementation method thereof |
| CN113516824A (en) * | 2021-04-14 | 2021-10-19 | 汉威科技集团股份有限公司 | Composite fire detector and detection method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |