CN1234003C - Vertical bidirection scattering type photoelectric smoke detector - Google Patents
Vertical bidirection scattering type photoelectric smoke detector Download PDFInfo
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- CN1234003C CN1234003C CN 03100624 CN03100624A CN1234003C CN 1234003 C CN1234003 C CN 1234003C CN 03100624 CN03100624 CN 03100624 CN 03100624 A CN03100624 A CN 03100624A CN 1234003 C CN1234003 C CN 1234003C
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- receiver
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Abstract
The present invention relates to a vertical directional scattering type photoelectric smoke-sensitive detector which mainly comprises a detection chamber composed of a light shielding window (1) and a base (3), a light emitter (2), a lens (4), a light backward receiving path composed of a backward receiving lens (6) and a backward receiver (5), and a light frontward receiving path composed of a frontward receiving lens (8) and a frontward receiver (9). The present invention adopts a bidirectional scattering light path, reasonably designs two scattering angles and differentiates black smoke, white smoke, water vapour and foreign matter by utilizing the difference of different scattering angles to different types of smog response characteristics, and thereby, the response to various kinds of smog is enhanced, and the misinformation is decreased. The present invention adopts the design of a unique structure, and thereby, the light path effectively utilizes the internal structure of the detection chamber. The present invention is widely applied to warning systems in buildings for preventing a fire hazard.
Description
Technical field
The present invention relates to optical detector of fire smoke, relate in particular to vertical two-way dispersion type optical detector of fire smoke.
Background technology
Existing optical detector of fire smoke has good response to grey smog, but insensitive to black smog.The alarm threshold value of this detector is adjusted through carrying out the oneself according to the smog type in smoke detection district behind the external setting-up.In order to respond black smoke, generally speaking all promptly reduce alarm threshold value by improving detector sensitivity, make detector can in time respond black smoke.But when the smog of very slight color such as dust, smoke from cigarette disturbed, very little smokescope can make detector the response output of alarm threshold value occur surpassing.So usually produce wrong report.
The objective of the invention is to: a kind of vertical two-way dispersion type optical detector of fire smoke is provided, and this detector produces different response output with respect to fixing scattering angle and dissimilar smog.
Summary of the invention
For achieving the above object, optical detector of fire smoke provided by the present invention, it comprises that light radiating portion and light accepts part.In emission cavity was injected into detecting chamber, the light that incides the photodetection chamber received and focuses on the optical receiver by receiver lens the light that the light radiating portion sends through the lens refraction.Vertical two-way dispersion type optical detector of fire smoke of the present invention is provided with forward direction and back to optical receiver, receives the light from two optical receiver lens respectively.Vertical two-way dispersion type optical detector of fire smoke of the present invention is according to the work of scattering of light principle.The central axis of emission light path and the angle that central axis constituted of receiving light path are scattering angle.90 °＜scattering angle (α)＜180 ° are called forward scattering; 0 °＜scattering angle (α)＜90 ° are called back scattering.For fixing scattering angle, dissimilar smog, the receiving unit that constitutes this scattering angle has different response output.When smog was of light color, the response output valve of receiving unit was bigger; When the smog color was dark, the response output valve of receiving unit was less.For the smog of same concentrations and same type, there is certain variation relation in the response output intensity of receiving unit according to the difference of scattering angle.When scattering angle was increased to 90 ° by 0 °, the response output valve of receiving unit from large to small; When scattering angle was increased to 180 ° by 90 °, the response of receiving unit output was changed from small to big; The variable quantity of the output valve the when variable quantity of output valve was increased to 180 ° than scattering angle by 90 ° when scattering angle was increased to 90 ° by 0 ° is much smaller.Adopt in forward direction and back scattering fixed angle under the prerequisite of two-way dispersion, constitute the receiving unit at back scattering angle with optical transmitting set and to constitute the receiving unit of forward-scattering angle different for the ratio of the response output valve of the smog of different colours with optical transmitting set.During from shallow to deep the variation of the color of smog, this ratio changes from small to big, and this ratio do not change with the concentration change of smog, and its size is only relevant with the color of smog.The ratio that the receiving unit that hence one can see that constitutes the receiving unit at back scattering angle and constitute forward-scattering angle is exported the response of smog different can be represented the difference of the color of smog.
The present invention is different colors of differentiating smog of using the ratio that the receiving unit of the receiving unit at back scattering angle and forward-scattering angle exports the response of smog.According to fixedly scattering angle is different to the response output of the smog of different colours, with reference to the smog color of judging, adjust alarm threshold value dynamically, the smog to different colours has just had the sensitivity level that is close like this.During black smoke,, in time reduce alarm threshold value, can in time respond black smoke according to judging the smog color.Ash according to the color of smog, in time improves alarm threshold value during cigarette equally, is close when making the sensitivity level of grey cigarette and black smoke.Grey cigarette for this class very slight color of smog of dust, cigarette can distinguish from the smog that the fire burning produces, and they responds, has so just solved the problem of reporting by mistake.
In two-way dispersion type optical detector of fire smoke, the receiving unit at formation back scattering angle and the receiving unit of formation forward-scattering angle are to be determined by their scattering angle and relations between the angle separately for the ratio of the response output valve of smog.Ratio when ratio during black smoke and grey cigarette will have enough big difference, so just can better distinguish the smog of different colours.In addition, for constituting the receiver at back scattering angle and the receiver that optical transmitting set constitutes forward-scattering angle with optical transmitting set, requiring has enough big response output valve respectively to smog separately.This makes will select two suitable scattering angle to make up in the design process.
Selected the less back scattering angle α of scattering angle during the design of vertical two-way dispersion type optical detector of fire smoke
1: 45 ° ± 5 ° and the big forward-scattering angle α of scattering angle
2: 135 ° ± 5 °.Two receivers that constitute two angles have bigger output valve respectively in back scattering angle and the attainable scope of forward-scattering angle, smogless resolution is enough arranged.Under the situation of smokescope equivalence, the ratio when constituting the darkest black smoke of the ratio of two optical receivers of two scattering angles and color when the most shallow grey cigarette of color differs 2.5～3 times, enough carries out the resolution of smog color.These two angles are very desirable selections.
At the back scattering angle hour, a size of detecting area longitudinal profile is very big, and the space of the detecting chamber that needs is also bigger.In order in the space of limited detecting chamber, to realize less back scattering angle, vertical two-way dispersion type optical detector of fire smoke of the present invention has adopted vertical structure, the central axis of promptly launching the central axis of light path and receiving light path intersects, and the angle that the plane at axis place and plane, wiring board place are constituted is 90 ° ± 20 °.This structure makes the longest dimension of longitudinal profile of the detecting area (being called for short the back to detecting area) that the emission light path that forms the back scattering angle and receiving light path intersect along the diagonal of detecting chamber longitudinal profile; In like manner form the emission light path of forward-scattering angle and the also this mode of detecting area (abbreviation forward direction) detecting area that receiving light path intersects.Realized less back scattering angle like this in limited detecting chamber space, this is one of its advantage.Its another advantage is that directivity is fine.Two receiving units are not advancing on the cigarette channel, stop that the obstacle that smog enters has reduced, and has improved directivity.
Description of drawings
Fig. 1 is the longitudinal sectional drawing according to vertical two-way dispersion type optical detector of fire smoke of the present invention;
Fig. 2 represents to launch the central axis of light path and the forward scattering angle α that central axis constituted of receiving light path;
Fig. 3 represents to launch the central axis of light path and the back scattering angle α that central axis constituted of receiving light path;
Fig. 4 represents the relation between detecting chamber and the detecting area;
Fig. 5 represents to replace with the plug-in unit receiver synoptic diagram of optical receiver and optical receiver lens;
Fig. 6 represents to replace with leaded light post and patch transmitters the synoptic diagram of optical transmitting set and light diversing lens.Among the figure:
The 1-shading window
The 2-optical transmitting set
The 3-base
4-light diversing lens
Behind the 5-to receiver
Behind the 6-to receiver lens
The 7-baffle plate
8-forward direction receiver lens
9-forward direction receiver
The 10-wiring board
Plug-in unit receiver behind the 11-
12-anterior plug-in receiver
13-leaded light post
The 14-patch transmitters
Embodiment
As shown in Figure 1, shading window 1 and base 3 constitute a darkroom, are called detecting chamber; Blade on the shading window constitutes optical trap, and it is entering of overslaugh smog neither, blocked outside ambient light again, makes inside become the darkroom, prevents the interference of external environment light; Sawtooth pattern design is arranged at the top of shading window inside, is used for effectively absorbing bias light.Base 3 constitutes a support that supports transmitter 2 and shading window 1, and support also plays the effect of fixing circuit board (10).In addition, structure within it also constitutes the path that receives light, and the light of reception shines on the receiver by this channel.Optical transmitting set is provided with the intracavity posterior end of the shading window 1 among Fig. 1, and the light that it sends is through lens 4 refractions, and an emission cavity that is full of sawtooth that constitutes by shading window and the end (3) seat is injected in the detecting chamber then.The central axis of the light that optical transmitting set 2 sends becomes 0 ° ± 5 ° with the plane at wiring board place.For simplifying technology and installation, radiating portion also can be replaced by patch transmitters and leaded light post, is the emission light path from the irradiant path of leaded light post, and its central axis overlaps with former axis.
The receiver (being called for short the back to receiver) that constitutes the back scattering angle with the emission light path selects flat table to seal dress, Surface Mount is on wiring board 10, scioptics 6 receive the light of detecting area, and the light of reception shines earlier on the receiver lens 6, and the process lens focus is to receiver 5.Plane, lens 6 place is perpendicular to receiving light path.The central shaft of the optical axis center of receiving light path and emission light path intersects and at 45 ± 5 ° and in same plane, the plane angulation at this plane and wiring board place is 90 ° ± 20 °.Forward direction, back also can be replaced by back, anterior plug-in receiver 11,12 respectively to receiver lens to receiver 9,5 and forward direction, back.Its central axis overlaps with former axis.Equally, optical transmitting set 2 and light diversing lens 4 also can be replaced by patch transmitters 14 and leaded light post 13 respectively.
Forward direction receiving unit and back are separated by baffle plate 7 to receiving unit, have blocked effectively not wish other veiling glare of receiving.Reduced bias light.
Detector is in the process of work, and smokescope hour is gathered the output valve of back to receiver and forward direction receiver simultaneously, calculates their ratio, according to the color of ratio in judgement smog, adjusts alarming threshold value in real time.When the smog color is black partially, reduce the value of cutting off from of reporting to the police; When the smog color is grey partially, improve the value of cutting off from of reporting to the police.When ratio exceeds certain scope, as excessive or too small the time, think interference such as foreign matter or water vapor are arranged.
In sum, the unusual part of vertical optical detector of fire smoke is its combination in conjunction with the scattering angle of vertical structure: 135 ° ± 5 ° and 45 ° ± 5 °.Its advantage is to have broken through structural restriction, can select more angle with rational combination.This combination of angles can be distinguished the color of smog, dynamically adjusts alarming threshold value, and detector is reached unanimity to the sensitivity of various smog; Can distinguish and disturb, reduce wrong report.Fundamentally having solved influences black smoke problem and this a pair of contradiction of wrong report problem.In addition, it has reduced the barrier that advances on the cigarette channel, makes that into cigarette is easier, has improved the directivity of detector.
Claims (10)
1. vertical two-way dispersion type optical detector of fire smoke, comprise: the detecting chamber that shading window and base (3) are formed, optical transmitting set (2), light diversing lens (4), forward direction receiver (9), back to receiver (5), forward direction receiver lens (8), back to receiver lens (6) and wiring board (10), it is characterized in that: constitute the forward scattering path by optical transmitting set (2) and forward direction receiver (9), constitute the back scattering path to receiver (5) by optical transmitting set (2) and back.
2. according to the vertical two-way dispersion type optical detector of fire smoke of claim 1, it is characterized in that: the emission light path central axis of forward scattering path and the angle α of receiving light path central axis
2Be 135 ° ± 5 °, the angle α of the emission light path central axis of back scattering path and the central axis of receiving light path
1It is 45 ° ± 5 °.
3. according to the vertical two-way dispersion type optical detector of fire smoke of claim 1, it is characterized in that: central axis and the forward direction receiving light path of emission light path and afterwards to the central axis of receiving light path on same plane.
4. according to the vertical two-way dispersion type optical detector of fire smoke of claim 3, it is characterized in that: described emission light path central axis and forward direction receiving light path and back are 90 ° ± 20 ° to the angle that the plane that central axis constituted and wiring board (10) plane, place of receiving light path constitute.
5. according to the vertical two-way dispersion type optical detector of fire smoke of claim 3, it is characterized in that: the angle that described emission light path central axis and wiring board (10) plane, place constitute is 0 ° ± 5 °.
6. according to the vertical two-way dispersion type optical detector of fire smoke of claim 1, it is characterized in that: the radiating portion that is made of optical transmitting set (2) and light diversing lens (4) can be replaced by patch transmitters (14) and leaded light post (13).
7. according to the vertical two-way dispersion type optical detector of fire smoke of claim 6, it is characterized in that: the angle that the axis of the light that radiating portion sends and wiring board (10) are constituted is 0 ° ± 5 °.
8. according to the vertical two-way dispersion type optical detector of fire smoke of claim 1, it is characterized in that: forward direction receiving unit that constitutes by forward direction receiver (9) and forward direction receiver lens (8) and back all can the replacement to receiver (5) and back by the plug-in unit receiver to receiving unit to receiver lens (6) formation by the back, and the angle that the central axis of the central axis of forward direction receiving light path and emission light path constitutes is 135 ° ± 5 °, and the back is 45 ° ± 5 ° to the central axis of receiving light path with the angle that the central axis of launching light path constitutes.
9. according to the vertical two-way dispersion type optical detector of fire smoke of claim 1, it is characterized in that: constitute the receiving unit at back scattering angle and judge the color of smoke particle by real-time judge and optical transmitting set (2), and adjust the numerical value of alarming threshold value according to the color of smoke particle in real time with the ratio of response output valve that optical transmitting set (2) constitutes the receiving unit of forward-scattering angle.
10. according to the vertical two-way dispersion type optical detector of fire smoke of claim 1, it is characterized in that: replace forward direction receiver (9) and forward direction receiver lens (8) by anterior plug-in receiver (12), by back plug-in unit receiver (11) replace the back to receiver (5) and after to receiver lens (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03100624 CN1234003C (en) | 2003-01-17 | 2003-01-17 | Vertical bidirection scattering type photoelectric smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03100624 CN1234003C (en) | 2003-01-17 | 2003-01-17 | Vertical bidirection scattering type photoelectric smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1517698A CN1517698A (en) | 2004-08-04 |
| CN1234003C true CN1234003C (en) | 2005-12-28 |
Family
ID=34281240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03100624 Expired - Lifetime CN1234003C (en) | 2003-01-17 | 2003-01-17 | Vertical bidirection scattering type photoelectric smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1234003C (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009237697A (en) * | 2008-03-26 | 2009-10-15 | Nohmi Bosai Ltd | Photoelectric smoke sensor |
| CN102498384B (en) * | 2009-09-15 | 2015-09-02 | 报知希株式会社 | Smoke sensor |
| CN102129755B (en) * | 2011-01-06 | 2012-07-04 | 中国科学技术大学 | Photoelectric smoke detector based on forward scattering in small angle |
| CN105116528B (en) * | 2015-08-28 | 2017-11-10 | 中国科学技术大学先进技术研究院 | A kind of scatter-type fire smog detector and its concentrator |
| CN106152211B (en) * | 2016-03-29 | 2019-02-15 | 宁波方太厨具有限公司 | A kind of real-time oil smoke concentration monitoring system and application have the kitchen ventilator of the system |
| CN108205867B (en) * | 2017-12-25 | 2021-03-09 | 中国科学技术大学 | Early fire smoke detection method with interference particle recognition capability |
| CN111919240B (en) * | 2018-03-28 | 2022-12-09 | 报知希株式会社 | Fire detection device |
| EP3803819B1 (en) * | 2018-05-31 | 2024-05-01 | Autronica Fire & Security AS | Printed circuit board for smoke detector |
| JP2019219956A (en) * | 2018-06-20 | 2019-12-26 | 能美防災株式会社 | Fire detector |
| CN110021135B (en) * | 2019-03-13 | 2022-01-18 | 赛特威尔电子股份有限公司 | Open fire alarm detection method and device, smoke alarm and storage medium |
| CN109949534A (en) * | 2019-04-19 | 2019-06-28 | 汉威科技集团股份有限公司 | A kind of multi-pass two-way dispersion smoke sensing detector labyrinth |
| CN110940619A (en) * | 2019-12-18 | 2020-03-31 | 无锡商业职业技术学院 | High-precision smoke detector |
| CN112384784B (en) * | 2020-09-25 | 2024-04-16 | 香港应用科技研究院有限公司 | Smoke detection system and method using multi-dimensional index monitoring based on multi-wavelength scattering |
| CN112525857B (en) * | 2020-11-26 | 2023-09-05 | 合肥铜冠信息科技有限责任公司 | Multi-verification motor vehicle tail gas remote measuring device and verification method |
-
2003
- 2003-01-17 CN CN 03100624 patent/CN1234003C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1517698A (en) | 2004-08-04 |
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