CN205405791U - Modified formula smoke fire detector that breathes in - Google Patents
Modified formula smoke fire detector that breathes in Download PDFInfo
- Publication number
- CN205405791U CN205405791U CN201620139374.6U CN201620139374U CN205405791U CN 205405791 U CN205405791 U CN 205405791U CN 201620139374 U CN201620139374 U CN 201620139374U CN 205405791 U CN205405791 U CN 205405791U
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- laser
- fire detector
- photelectric receiver
- suction type
- air inlet
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- 239000000779 smoke Substances 0.000 title claims abstract description 60
- 239000002245 particle Substances 0.000 claims description 35
- 239000008187 granular material Substances 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 23
- 230000035945 sensitivity Effects 0.000 description 5
- 235000019504 cigarettes Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003287 optical Effects 0.000 description 3
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- 230000000875 corresponding Effects 0.000 description 2
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- 101700050571 SUOX Proteins 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000009288 screen filtration Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Abstract
The utility model belongs to the technical field of fire detection, a modified formula smoke fire detector that breathes in is related to, which comprises a housin, the inside component laser cavity of casing, air inlet and gas outlet have been seted up to the middle part of casing, air inlet and gas outlet set up relatively, the one end of laser cavity is equipped with the laser pipe, the other end of laser cavity is equipped with a photoelectric receiver who is arranged in receiving the forward scattering light beam of the smog granule of laser cavity, the 2nd photoelectric receiver who is arranged in receiving the sideways scattering light beam of the smog granule of laser cavity, line between air inlet and the gas outlet is orthogonal with the the central axis of the whole laser beam of laser pipe transmission. The utility model discloses have low cost, easy debugging, highly reliable advantage.
Description
Technical field
This utility model belongs to technical field of fire detection, relates to a kind of smoke fire detector, the air suction type smoke fire detector of especially a kind of improvement.
Background technology
In detection field, except traditional Smoke Detector, warming probe, present air suction type smoke fire detector is widely applied as a kind of high sensitivity, early stage sense cigarette type detector, can be widely used in the important place such as machine room, large space.But there is various problem and defect in the aspirating smoke detector in currently available technology, conventional aspirating smoke detector of the prior art mainly has following two:
The first aspirating smoke detector: as it is shown in figure 1, this kind of aspirating smoke detector mainly adopts and launch the red focus laser beam that a branch of wavelength is 650nm.Forward scattering is there is when running into smoke particle 9 or dust when laser beam 3; the forward scattering light beam 6 of smoke particle is received by the first photelectric receiver 7 in figure; smog is bigger; receiving intensity is higher; the gas that protected space is drawn into enters through air inlet 4; flowing out through gas outlet 5, such air suction type smoke fire detector just can accurately detect the smog content in the air of on-the-spot protected space.Owing to the brightness of laser is significantly high, the extinction effect of laser cavity is excellent.As long as therefore having fraction of smog just can detect.But this kind of detector major downside is that easily impact by airborne dust causes false alarm.
The sensitivity of general common sense cigarette probe is more than 5%obs/m, and the limiting snesibility of aspirating smoke detector can reach 0.001%obs/m, be equivalent to remolding sensitivity ordinary ultrasonic probe high thousands of times, very easily detect fire early-stage smog, it is thus possible to freeing of effective fire preventing, fire is gone out in bud.%obs/m refers to light attenuation in one meter of distance, and the less proof air of this value is cleaner.But in reality use procedure, containing airborne dust in gas on-site, such as protected space cleaning, or running into airborne dust weather, airborne dust enters protection zone, or on-the-spot itself there is airborne dust for a long time, such as the Primary processing shop of cigarette factory, cement workshop etc..Although now airborne dust filters through filter, but still has and be partially in laser cavity, form the forward scattering of laser, cause the false alarm of non-smog.
General smoke particle is at several nanoscales to several micron orders, and airborne dust is typically in several microns to tens micron levels, and namely the airborne dust granule of the overwhelming majority is much larger than normal smoke particle.Therefore, solving because false alarm that on-the-spot airborne dust causes is the task of top priority of air suction type smoke fire detector, existing method has:
A). add strong filter:
By the air of protected area by thinner filter screen filtration, airborne dust can be kept off in the outside of laser cavity, it is possible to reach not report by mistake.But meticulous drainage screen will soon be blocked by the dust granule in dirty air, is greatly shortened the service life of defecator, causes very big trouble, adds unnecessary operating cost.Along with filter laying dust amount is more and more many, mesh diameter is also more and more less, also by filtered for that have mass efficient, to need detection smoke particle, makes sensitivity decrease, and failing to report when causing real fire to occur, consequence is very serious.
B). increase and catch bulky grain method:
Add high power optical loupes before adopting photographic head, directly observe smoke particle and airborne dust particle, adopt image processing method to reject the bulky grain in image.This kind of method effect is clearly, it is highly susceptible to removing bulky grain airborne dust, do not result in false alarm, but revolutionize the method that detecting laser beam is general, causing cost to rise in a large number, common photographic head cannot be differentiated at all, and needs low-light (level), high-resolution photographic head and much more expensive optics multi-stage amplifier system, showing not good enough on this series products market, price does not have competitiveness.
C). adopt two waveband light source (i.e. Different lightwave length), double reception circuit to be differentiated:
Namely, the second aspirating smoke detector: as shown in Figure 2, compared with the first aspirating smoke detector above-mentioned, this kind of aspirating smoke detector has simply increased a set of detecting structure newly, newly-increased is the blue laser detecting structure of 420nm, namely laser tube is 2, the wavelength of the laser beam of one of them laser tube emissions is 650nm, the wavelength of the laser beam of another transmitting is 420nm, correspondingly, photelectric receiver is also 2, one of them corresponding laser receiving 650nm, another corresponding laser receiving 420nm.Its principle is that the intensity of its forward scattering is different when the smog of same diameter or dust granule are irradiated by the light of different wave length.Granule is thinner, and the signal difference that both receive is less, and granule is thicker, and both signal differences are bigger.By contrasting the difference in signal strength of two different wave lengths, the size of particulate matter just can be differentiated.For this kind of detector, can accurate two wavelength laser intensity of control be stablized with consistent is crucial.But this kind of mode is in producing implementation process, adding complete set detection device, cost increase, structure becomes big, and needs the accurate emitted luminescence intensity controlling two wavelength consistent.But ensure that the lasing intensity stability received under signal magnitude concordance and long-term different temperatures is increasingly difficult, considerably increase hardware debugging difficulty and cost of labor.Through market validation, this kind of detector has the ability differentiating dust, but cost or degree of stability are limited, lacks the market competitiveness.
In use meet airborne dust due to air suction type smoke fire detector of the prior art easily to report by mistake, be badly in need of a kind of low cost, easily debugging, highly reliable air suction type smoke fire detector to solve this difficult problem.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art, it is provided that a kind of low cost, easily debugging, highly reliable improvement air suction type smoke fire detector.
This utility model solves the technical scheme of problem: the air suction type smoke fire detector of a kind of improvement, including housing, the Inner Constitution laser chamber of described housing, the middle part of described housing offers air inlet and gas outlet, described air inlet and gas outlet are oppositely arranged, one end of described laser chamber is provided with laser tube, the other end of described laser chamber is provided with the first photelectric receiver of the forward scattering light beam for receiving the smoke particle in laser chamber, for receiving the second photelectric receiver of the lateral scattering light beam of the smoke particle in laser chamber, line between described air inlet and gas outlet is orthogonal with the central axis of the whole laser beam of laser tube emissions.
Further, the exit portal of described laser tube is provided with focus lamp.
Further, described air inlet is provided with filter.
Further, the wavelength of the laser beam of described laser tube emissions is 650nm.
Further, the lateral scattering light beam of described smoke particle is the lateral scattering light beam of the laser beam path 90 degree being perpendicular to described smoke particle place.
Further, described first photelectric receiver and the second photelectric receiver are separately fixed on the inwall of housing.
Further, described first photelectric receiver and the second photelectric receiver are each attached on the inwall of the housing of the side away from laser tube of air inlet.
Further, on the inwall of the housing that described second photelectric receiver is arranged between the first photelectric receiver and air inlet.
Further, described housing is the cylinder of traverse, and described laser tube is positioned on cylindrical central axis, and the central axis of the whole laser beam of described laser tube emissions and cylindrical central axis are on same straight line.
The principle of the air suction type smoke fire detector of improvement described in the utility model is:
Beam of laser, especially through over-focusing laser, when being irradiated to smoke particle, along with the change of particle diameter, its forward scattering light and the side scattered light (i.e. 90 degree, side scattering light) being perpendicular to laser beam path 90 degree have significant change.
When particle diameter less than or when being equal to optical maser wavelength, its forward scattering is occupied an leading position, and 90 degree, side scattering strength is more weak.And back reflection is less.
When particle diameter is a bit larger tham or during times over optical maser wavelength 650nm, forward scattering dies down, and the scattered light intensity of 90 degree, side is maximum, and back reflection also increases to some extent, and now particle diameter is between several microns to some tens of pm.
When particle diameter is much larger than 650nm, forward scattering is more weak, and the scattering light of 90 degree, side dies down, and back reflection light becomes higher, and now particle diameter is more than microns up to a hundred.
That is, place photelectric receiver the side of 90 degree, the particulate matter of particle pollution scope can be detected.Due in airborne dust, the particle diameter of larger particles is more than hundreds of micron, filtration is filtered out, granule within some tens of pm enters laser chamber through filter and is received by the second photelectric receiver, and it is less less than the airborne dust granule of a few micrometers, smoke particle is generally equivalent to or much smaller than 650nm wavelength, substantially all generation forward scattering, is received by photelectric receiver.
The beneficial effects of the utility model are:
1. the mesh of filter not BITAI is little, it is only necessary to filter large granule, therefore drainage screen is not easy blocked, effectively extends the service life of filter, reduces use cost；
2. only having used one group of Laser emission, it is easy to control, do not change the control circuit of former maturation, increasing the receivers volume on equipment affects less, and cost increases seldom, and total is simple；
3. can use the detection numerical values recited of comparison the first photelectric receiver and the second photelectric receiver, owing to the 90 degree of scatterings in forward direction and side are different to the sensitivity of grain diameter, very easily differentiate, therefore the confusion region judged is much smaller than the laser mode of dual wavelength, not easily judging by accident, accuracy rate increases, practical；
4. meeting the Rayleigh scattering model in optics, i.e. granule hour, scattering light is pre-large post-small, resembles a pear in shape；Broad in the middle hour of granule, the increase of 90 degree, side, scattering spherical in shape；When granule is bigger, rear big front little, in falling pyriform, result modeling easily, after this utility model foundation, through airborne dust it is experimentally confirmed that excellent effect, can be told fire cigarette and airborne dust completely accurately, will not report by mistake.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first aspirating smoke detector in described prior art；
Fig. 2 is the structural representation of the second aspirating smoke detector in described prior art；
Fig. 3 is the structural representation of the air suction type smoke fire detector of improvement described in the utility model.
In figure: 1-laser tube, 2-focus lamp, 3-laser beam, 4-air inlet, 5-gas outlet, the forward scattering light beam of 6-smoke particle, 7-the first photelectric receiver, 8-housing, 9-smoke particle, 10-filter, 11-the second photelectric receiver, the lateral scattering light beam of 12-smoke particle, the back reflection light beam of 13-smoke particle.
Fig. 1 to Fig. 3 all represents the flow direction of detection air from air inlet 4 to the arrow of gas outlet 5.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, this utility model is further described.
As it is shown on figure 3, Fig. 3 illustrate only a wherein laser beam.A kind of air suction type smoke fire detector of improvement, including housing 8, the Inner Constitution laser chamber of described housing 8, the middle part of described housing 8 offers air inlet 4 and gas outlet 5, described air inlet 4 and gas outlet 5 are oppositely arranged, one end of described laser chamber is provided with laser tube 1, the other end of described laser chamber is provided with the first photelectric receiver 7 of the forward scattering light beam 6 for receiving the smoke particle in laser chamber, for receiving the second photelectric receiver 11 of the lateral scattering light beam 12 of the smoke particle in laser chamber, line between described air inlet 4 and gas outlet 5 is orthogonal with the central axis of the whole laser beam that laser tube 1 is launched.
The exit portal of described laser tube 1 is provided with focus lamp 2.
Described air inlet 4 is provided with filter 10.
The wavelength of the laser beam 3 that described laser tube 1 is launched is 650nm.
The lateral scattering light beam 12 of described smoke particle is the lateral scattering light beam of the laser beam path 90 degree being perpendicular to described smoke particle place；The back reflection light beam 13 of smoke particle is the laser beam 3 back reflection light beam when meeting smog or dust.
Described first photelectric receiver 7 and the second photelectric receiver 11 are separately fixed on the inwall of housing 8.
Described first photelectric receiver 7 and the second photelectric receiver 11 are each attached on the inwall of the housing 8 of the side away from laser tube 1 of air inlet 4.
On the inwall of the housing 8 that described second photelectric receiver 11 is arranged between the first photelectric receiver 7 and air inlet 4.
Described housing 8 is the cylinder of traverse, and described laser tube 1 is positioned on cylindrical central axis, and the central axis of the whole laser beam that described laser tube 1 is launched and cylindrical central axis are on same straight line.
This utility model is not limited to above-mentioned embodiment, and when without departing substantially from this utility model flesh and blood, any deformation that it may occur to persons skilled in the art that, improvement, replacement each fall within protection domain of the present utility model.
Claims (9)
1. the air suction type smoke fire detector improved, including housing, it is characterized in that, the Inner Constitution laser chamber of described housing, the middle part of described housing offers air inlet and gas outlet, described air inlet and gas outlet are oppositely arranged, one end of described laser chamber is provided with laser tube, the other end of described laser chamber is provided with the first photelectric receiver of the forward scattering light beam for receiving the smoke particle in laser chamber, for receiving the second photelectric receiver of the lateral scattering light beam of the smoke particle in laser chamber, line between described air inlet and gas outlet is orthogonal with the central axis of the whole laser beam of laser tube emissions.
2. the air suction type smoke fire detector of improvement according to claim 1, it is characterised in that the exit portal of described laser tube is provided with focus lamp.
3. the air suction type smoke fire detector of improvement according to claim 1, it is characterised in that described air inlet is provided with filter.
4. the air suction type smoke fire detector of improvement according to claim 1, it is characterised in that the wavelength of the laser of described laser tube emissions is 650nm.
5. the air suction type smoke fire detector of improvement according to claim 1, it is characterised in that the lateral scattering light beam of described smoke particle is the lateral scattering light beam of the laser beam path 90 degree being perpendicular to smoke particle place.
6. the air suction type smoke fire detector of improvement according to claim 1, it is characterised in that described first photelectric receiver and the second photelectric receiver are separately fixed on the inwall of housing.
7. the air suction type smoke fire detector of improvement according to claim 6, it is characterised in that described first photelectric receiver and the second photelectric receiver are each attached on the inwall of the housing of the side away from laser tube of air inlet.
8. the air suction type smoke fire detector of improvement according to claim 7, it is characterised in that on the inwall of the housing that described second photelectric receiver is arranged between the first photelectric receiver and air inlet.
9. the air suction type smoke fire detector of improvement according to claim 1, it is characterized in that, described housing is the cylinder of traverse, described laser tube is positioned on cylindrical central axis, and the central axis of the whole laser beam of described laser tube emissions and cylindrical central axis are on same straight line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620139374.6U CN205405791U (en) | 2016-02-24 | 2016-02-24 | Modified formula smoke fire detector that breathes in |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620139374.6U CN205405791U (en) | 2016-02-24 | 2016-02-24 | Modified formula smoke fire detector that breathes in |
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| Publication Number | Publication Date |
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| CN205405791U true CN205405791U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620139374.6U Active CN205405791U (en) | 2016-02-24 | 2016-02-24 | Modified formula smoke fire detector that breathes in |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031658A (en) * | 2017-06-12 | 2018-12-18 | 中国科学院大连化学物理研究所 | A kind of slim laser transmission detection window |
-
2016
- 2016-02-24 CN CN201620139374.6U patent/CN205405791U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031658A (en) * | 2017-06-12 | 2018-12-18 | 中国科学院大连化学物理研究所 | A kind of slim laser transmission detection window |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221227 Address after: 200131 Room A2, Floor 5, No. 456, Fute North Road, Pudong New Area Free Trade Pilot Zone, Shanghai Patentee after: HONEYWELL AUTOMATION CONTROL (CHINA) CO.,LTD. Address before: Floor 3, Standard Plant, No. 3, Yongjie North Road, Yongfeng Industrial Base, Haidian District, Beijing 100081 Patentee before: DINGSHENGTE SAFETY WARNING TECHNOLOGY (BEIJING) Co.,Ltd. |