CN208706021U - A kind of scatter-type fire smog detector and its light absorber - Google Patents
A kind of scatter-type fire smog detector and its light absorber Download PDFInfo
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- CN208706021U CN208706021U CN201821134360.0U CN201821134360U CN208706021U CN 208706021 U CN208706021 U CN 208706021U CN 201821134360 U CN201821134360 U CN 201821134360U CN 208706021 U CN208706021 U CN 208706021U
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Abstract
The utility model discloses a kind of scatter-type fire smog detector and its light absorbers, including concentrator shell, hollow cylinder and cone, in the entrance that the front end of concentrator shell is light beam, hollow cylinder one end is connect with concentrator shell rear end, the other end bottom of hollow cylinder is arranged in cone, and the internal reflection surface of concentrator shell is compound parabolic reflecting surface.The light absorber is divided into two classes to incident ray absorption, the first kind: light beam is incident on concentrator shell inner surface, inner surface light beam is mostly absorbed and fraction reflect convergence, the part of convergence enters in the concaver that hollow cylinder and cone are constituted, carry out further reflection-absorption, the second class: light beam, which is directly incident in the concaver of hollow cylinder and cone composition, carries out multiple reflections and absorption.By the above process, the available efficient absorption of incident beam, to significantly reduce influence of the detector internal light source to background signal.
Description
Technical field
The utility model relates to fire smog detector technical field more particularly to a kind of scatter-type fire smog detectors
And its light absorber and application the light absorber scatter-type fire smog detector.
Background technique
Scatter-type smoke detector is the fire detection mode being most widely used, and design fundamentals are to utilize fire
Scattering process of the smoke particle generated in the process to light beam, by measuring the scattered light intensity of certain angle to determine whether occurring
Fire.Nuclear structure is a labyrinth chamber, and external environmental light can effectively be stopped to enter detector, the light-emitting component of detector
Labyrinth chamber interior is arranged in receiving element.Under normal running conditions, light-emitting component emits light beam with impulse form, visits simultaneously
It surveys device and acquires signal.Although chamber is black material, still can inevitably reflect or diffusing reflection part light, reflection
Light has part and is received the certain background signal of element reception generation.Particularly, interior when detector is after long-time use
Portion can accumulate dust, be equivalent to the reflectivity for considerably increasing chamber surfaces, then cause the significant drift of background signal, even
It will affect detection performance.
In order to ensure detector stable operation, light beam direct projection should be avoided in the case of no aerosol invasion or reflection is reached and received
On the sensitizing range of element, for this reason, it is necessary to a kind of efficient light absorber be designed, for the chamber of the detector, to light source
The light beam of sending is substantially completely absorbed.One designed in this way is advantageous in that, even if detector cavity chamber interior is by serious dirty
Dye, due to not having light beam to reach contaminated surface, significant change will not occur for background signal.Another benefit designed in this way exists
In being equivalent to and increase signal-to-noise ratio even if the background signal of detector will not dramatically increase using high energy light source.
The existing light absorber for smoke detector is that cone light disclosed in Chinese patent CN106574989A is inhaled
Device is received, the light absorber is the problem is that the foreseeable several secondary reflections of optical path can occur for the incident light entered, it is likely that
Can reflect and enter in chamber, reflected light still has larger luminous intensity, will cause it is difficult to predict background letter
Number.
On the other hand, guarantee the light absorber play useful effect be using with smaller diverging arrow beam of light light source,
A kind of surface mount device (SMD) as disclosed in British patent GB2404731 can make LED generate arrow beam of light.Or using quasi-
Very high laser light source is directly spent, the background signal that can greatly reduce detector is used cooperatively with light absorber, and reduce
It is influenced caused by Aerosol Pollution.
In conclusion in existing scatter-type fire smog detector, due to not having light absorber structure or light
The extinction effect of absorber is undesirable, significantly impacts the stability and reliability of detector, this has been those skilled in the art
Member's technical problem urgently to be resolved.
Utility model content
Technical problems based on background technology, the utility model proposes a kind of scatter-type fire smog detector and its
Light absorber can carry out efficient absorption to incident light beam, significantly reduce internal light source reasons for its use signal.
It is hollow the utility model proposes a kind of light absorber of scatter-type fire smog detector, including concentrator shell
Cylinder and cone are the entrances of light beam in the front end of concentrator shell, and hollow cylinder one end is connect with concentrator shell rear end,
The other end bottom of hollow cylinder is arranged in cone, and the internal reflection surface of concentrator shell is compound parabolic reflecting surface.
The light absorber is divided into two classes to incident ray absorption, and the first kind: light beam is incident on concentrator shell inner surface, and inner surface is to light
Shu Jinhang mostly absorb and fraction reflect convergence, the part of convergence enters hollow cylinder and cone constitute it is recessed
In the body of face, carry out further reflection-absorption, the second class: light beam is directly incident on the concaver of hollow cylinder and cone composition
Interior progress multiple reflections and absorption.By the above process, the available efficient absorption of incident beam, to significantly reduce detector
Influence of the internal light source to background signal.
In a further embodiment, the light absorber selects black plastic material, and interior surface is smooth, especially
It is to guarantee that concentrator shell inner surface is smooth.
In a further embodiment, light absorber entrance opening dimension is greater than the sectional dimension of the position incident beam, really
It protects all light beams and is able to enter the light absorber.
In a further embodiment, the internal reflection surface of concentrator shell is adopted according to compound parabolic concentrator principle
The compound parabolic reflecting surface for being rotated and being formed around its axis of symmetry with two sections of parabolas being arranged symmetrically；
Preferably, the setting parameter of the condenser can guarantee that condenser meets rim ray principle；Preferably, focal plane
Positioned at outlet rear end a distance, it is ensured that the assemblying part of incident beam can reach back outlet.
In a further embodiment, the bottom surface of cone is overlapped with hollow cylinder, and the height of cone is slightly below optically focused
The focal plane position of device.
In a further embodiment, cone can be straight cone, be also possible to inclined taper, and apex angle is less than
45 °, it is ensured that at least 4 secondary reflections can occur for incident beam.
In a further embodiment, the length of hollow cylinder cannot be too long, controls the overall length of the light absorber
In suitable dimension, it is easily installed in the chamber structure of scatter-type fire smog detector.
The utility model proposes a kind of scatter-type fire smog detectors, comprising: detector housing, light source, light absorption
Device, optical receiver component, wherein light absorber uses above-mentioned scatter-type fire smog detector light absorber；
One optical detection chamber of formation inside detector housing, including housing base, the labyrinth structure being made of partition, with
And housing cover.Light source, light absorber and optical receiver component are mounted in optical measurement chamber, and light source is used for optical detection chamber
Emission detection light beam, light absorber are used to absorb the remaining light beam not scattered by smoke particle, and optical receiver component is for receiving
The scattering light of smoke particle.
In a further embodiment, light absorber is arranged in the right opposite of light source；Preferably, the central axis of light absorber
Line is overlapped with the central axis of light source.
In a further embodiment, light source used in detector has lower diversity；Preferably, using laser
Arrow beam of light LED light source disclosed in light source or British patent GB2404731.
The utility model compared with prior art the advantages of be:
(1) under volume size similar conditions, light absorber of the present invention has more efficient absorbing properties, is conducive to mesh
Application of the preceding high energy light source in scatter-type fire smog detector；
(2) light absorber structure size of the present invention is small and exquisite, is easily installed the spy of existing scatter-type fire smog detector
It surveys in chamber structure；
(3) absorbing properties of light absorber of the present invention can satisfy wanting for existing scatter-type fire smog detector
It asks, reduces internal light source light beam reasons for its use signal to increase the signal-to-noise ratio of detector and improve the reliable of detectable signal
Property.
Detailed description of the invention
Fig. 1 is a kind of structural representation of scatter-type fire smog detector light absorber in the utility model embodiment
Figure.
Fig. 2 is a kind of schematic diagram of internal structure of scatter-type fire smog detector in the utility model embodiment.
Fig. 3 is a kind of external structure schematic diagram of scatter-type fire smog detector in the utility model embodiment.
Fig. 4 is by optical simulation software TracePro to scatter-type fire smog detector in the utility model embodiment
With light absorber with conical light absorber in the prior art to the optical analog schematic diagram of incident ray assimilation effect, wherein
Fig. 4 A is the optical analog effect of scatter-type fire smog detector light absorber in the embodiment of the present invention, and Fig. 4 B is existing skill
Optical analog effect of the conical light absorber to incident ray assimilation effect in art.
Fig. 5 is by optical simulation software TracePro to scatter-type fire smog detector in the utility model embodiment
With light absorber and in the prior art optical analog result of the conical light absorber to incident ray assimilation effect, wherein figure
5A is the optical analog of scatter-type fire smog detector light absorber in the embodiment of the present invention as a result, Fig. 5 B is the prior art
Optical analog result of the middle cone light absorber to incident ray assimilation effect.
Appended drawing reference meaning in figure are as follows: 1 is concentrator shell, and 2 be concentrator shell entrance, and 3 export for concentrator shell,
4 be hollow cylinder, and 5 be cone, and 6 be housing base, and 7 be shading partition, and 8 be light source, and 9 be light absorber, and 10 be the first light
Receiving element is learned, 11 be the second optical receiver component, and 12 be incident beam, and 13 be housing cover.
Specific embodiment
With reference to the accompanying drawing and specific embodiment further illustrates the utility model.
As shown in FIG. 1, FIG. 1 is scatter-type fire smog detector light absorbers a kind of in the utility model embodiment
Structural schematic diagram.
Referring to Fig.1, a kind of scatter-type fire smog detector light absorber that the utility model embodiment proposes, including
Concentrator shell 1, the interior surface reflecting surface of concentrator shell are compound parabolic reflecting surface, and reflecting surface is smooth black
Surface, light beam are incident on reflecting surface by concentrator shell entrance 2, and most of energy is absorbed, and small part is by reflection convergence
3 positions are exported to concentrator shell.
In the utility model embodiment, the design parameter of concentrator shell inner surface is anti-referring to specification compound parabolic
The design parameter in face is penetrated, incident beam can be collected and be converged at concentrator shell outlet 3, specific design process reference
Chinese granted patent CN105116528B.
In order to further be absorbed to direct incidence or by the light that reflection converges to concentrator shell outlet 3,
It is coupled the composite construction of a hollow cylinder 4 and cone 5 at concentrator shell outlet 3.4 bottom end of hollow cylinder and cone 5
Bottom is overlapped, and 4 interior diameter of hollow cylinder is equal with 5 base diameter of cone, then 4 inner surface of hollow cylinder and cone
5 outer surfaces form a Duan Kaifang, and the closed composite construction of the other end, section is scissor.According to Chinese patent
The order of reflection of angle and incident ray that CN106574989A, the surface of cone 5 and the axis of cone are formed has very high point
System, preferably angle is smaller, and order of reflection is more, i.e., optical absorption is better.In the particular embodiment, the height of cone
The slightly below length of hollow cylinder 4 is particularly less than the focal plane of condenser, so that converged by concentrator shell 1
Light will not shine directly into the vertex position of cone 5.
As shown in Fig. 2, Fig. 2 shows for the internal structure of scatter-type fire smog detector a kind of in the utility model embodiment
It is intended to.
As shown in figure 3, Fig. 3 shows for the external structure of scatter-type fire smog detector a kind of in the utility model embodiment
It is intended to.
Referring to Fig. 2 and Fig. 3, the utility model proposes a kind of scatter-type fire smog detector, comprising: shading partition 7,
Housing base 6, light source 8, light absorber 9 and the first optical receiver component 10 and the second optical receiver component 11 and case lid
Plate 13.Wherein, light absorber 9 uses above-mentioned scatter-type fire smog detector light absorber；Light source 8, light absorber 9 and
First optical receiver component 10 and the second optical receiver component 11 are mounted on detector housing pedestal 6, and light absorber 9 is mounted on
8 opposite side of light source, in the particular embodiment, light absorber 9, which can be with the central symmetry axis of light source 8, to be overlapped, can also
With in the same plane, the first optical receiver component 10 and the second optical receiver component 11 are separately mounted to center axis thereof and light
The position that 8 central axis shape of source forms an angle receives the scattering light of corresponding scattering angle, using two angular acceptances respectively
Scattered signal has better smoke detection performance.
In a further embodiment, light source 8 uses the lower light source of diversity, such as laser light source, or by quasi-
Straight arrow beam of light LED light source.
It is necessary to ensure that in a particular embodiment and is less than entrance opening dimension in the sectional dimension of 9 inlet light beam 12 of light absorber.
Below by optical simulation software TracePro to scatter-type fire smog detector light absorption in the present embodiment
The absorbing ability of device carries out optical analog comparative analysis.
As shown in figure 4, being used by TracePro software scatter-type fire smog detector in the utility model embodiment
Light absorber (Fig. 4 A) carries out optical mode to the assimilation effect of incident beam with conical light absorber (Fig. 4 B) in the prior art
It is quasi-.
During optical analog, it is assumed that the Surface absorption rate of two kinds of light absorbers is all 0.9, and reflectivity 0.1 belongs to
Mirror-reflection.
During optical analog, the design parameter of light source are as follows: spy is simulated using the annular lattice point light source of Gaussian Profile
The incident beam of device light source is surveyed, light ray parallel is incident, and total light number that emits is 1078201, beam diameter 12mm, light
Light flux distribution is Gaussian Profile, waist 2mm.
The design parameter of the light absorber of the present embodiment are as follows: the length of concentrator shell is 10mm, thickness 0.1mm, and axis inclines
15 ° of gradient, lateral focus shift 2.5mm, focal length 3.26mm, the inside diameter of hollow cylinder is 5mm, length 7mm, thickness
0.1mm, cone base diameter 5mm, height 6mm.
Design parameter as the prior art cone light absorber compared are as follows: inner surface circular conical surface bottom diameter 16mm,
Height 19.4mm, circular cone drift angle are about 45 °, which can satisfy the incidence as described in Chinese patent CN106574989A
Four secondary reflections at least occur for light beam.
From fig. 4, it can be seen that the size phase of the size of the present embodiment light absorber and prior art cone light absorber
Closely, difference is structure design principle difference, is comparable.
As shown in figure 5, be to be received the distribution schematic diagram of the received incident ray in face on the receiving surface after reflecting limited times,
Fig. 5 A is the analog result of scatter-type fire smog detector light absorber in the utility model embodiment, and Fig. 5 B is existing skill
The analog result of art cone light absorber, it can be seen that the light that the two reflects all mainly concentrate with incident beam in
On mandrel line.Incident ray quantity is 1078201 in total, and the luminous flux that every light carries is 1W, is dissipated from the utility model
The total light flux for the light that emitting fire smog detector is reflected with light absorber by limited times is 5.9556W, and Zhan is total
The 5.5055 × 10 of emitting light flux-6, pass through the total of the light that limited times reflects from prior art cone light absorber
Luminous flux is 113.85W, the 1.0524 × 10 of the total emitting light flux of Zhan-4, it compares and is known that 19 times that the latter is about the former, because
It is public will to be substantially better than application for a patent for invention CN106574989A to incident ray volume assimilation effect for light absorber in this present embodiment
The conical light absorber opened can more effectively absorb incident ray.
On the other hand, according to application for a patent for invention CN106574989A, when smoke density reaches typical fire water
Usually, the incident light quantity on optical detector is about emit light quantity 1/100000 to 1/10000, that is to say, that light absorber is answered
When have with magnitude or higher amount grade assimilation effect, with guarantee residual reflection come out light intensity and detector smoke signal
Compared to sufficiently small, to reduce influence of the light beam of light source not scattered to signal.In calculating simulation, Surface absorption rate is arranged
Be 0.9, it is easy to accomplish that this uses black plastic surface in the art, therefore the utility model proposes scatter-type fire
Smoke detector has the absorbent properties of 1/1000000 magnitude or more with light absorber, meets the requirement.
In the scatter-type fire smog detector that the present embodiment proposes, by using above-mentioned scatter-type fire smog detector
With light absorber, influence of the light beam of light source to detector background signal is significantly reduced, signal-to-noise ratio is increased, to improve fire
The probe response performance of smoke detector.
Claims (10)
1. a kind of light absorber of scatter-type smoke detector, it is characterised in that: including concentrator shell, hollow cylinder and circular cone
Body is the entrance of light beam in the front end of concentrator shell, and hollow cylinder one end is connect with concentrator shell rear end, cone setting
In the other end bottom of hollow cylinder, the internal reflection surface of concentrator shell is compound parabolic reflecting surface, the light absorber
Be divided into two classes to incident ray absorption, the first kind: light beam is incident on concentrator shell inner surface, and inner surface carries out big portion to light beam
Reflect convergence with dividing ground absorption and fraction, the part of convergence enters in the concaver that hollow cylinder and cone are constituted, into
The further reflection-absorption of row, the second class: it is more that light beam is directly incident on progress in the concaver of hollow cylinder and cone composition
Secondary reflection and absorption, by the above process, the available efficient absorption of incident beam, to significantly reduce detector internal light source
Influence to background signal.
2. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: the light absorption
Device selects black plastic material, and interior surface is smooth, guarantees that concentrator shell inner surface is smooth.
3. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: light absorber enters
Mouth size is greater than the sectional dimension of the position incident beam, it is ensured that all light beams are able to enter the light absorber.
4. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: concentrator shell
Internal reflection surface be to be revolved using two sections of parabolas being arranged symmetrically around its axis of symmetry according to compound parabolic concentrator principle
Then the compound parabolic reflecting surface formed.
5. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: the condenser
Setting parameter can guarantee that condenser meets rim ray principle；Focal plane is located at outlet rear end a distance, it is ensured that incident light
The assemblying part of beam can reach back outlet.
6. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: the bottom of cone
Face is overlapped with hollow cylinder, and the height of cone is slightly below the focal plane position of condenser.
7. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: cone is straight
Cone or inclined taper, and apex angle is less than 45 °, it is ensured that at least 4 secondary reflections can occur for incident beam.
8. a kind of light absorber of scatter-type smoke detector according to claim 1, it is characterised in that: hollow cylinder
Length cannot be too long, controls the overall length of the light absorber in suitable dimension, is easily installed scatter-type fire hazard aerosol fog
In the chamber structure of detector.
9. a kind of scatter-type fire smog detector, it is characterised in that: include: detector housing, light source, light absorber, optics
Receiving element, wherein light absorber uses the scatter-type fire smog detector light absorber of any one of claim 1-8；
An optical detection chamber, including housing base, the labyrinth structure be made of partition and case lid are formed inside detector housing
Plate；Light source, light absorber and optical receiver component are mounted in optical measurement chamber, and light source is used for optical detection chamber emission detection
Light beam, light absorber are used to absorb the remaining light beam not scattered by smoke particle, and optical receiver component is for receiving smoke particle
Scattering light.
10. a kind of scatter-type fire smog detector according to claim 9, it is characterised in that: light absorber is arranged in
The right opposite of light source；The central axis of light absorber is overlapped with the central axis of light source；Light source used in detector have compared with
Low diversity；Using laser light source or arrow beam of light LED light source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821134360.0U CN208706021U (en) | 2018-07-18 | 2018-07-18 | A kind of scatter-type fire smog detector and its light absorber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821134360.0U CN208706021U (en) | 2018-07-18 | 2018-07-18 | A kind of scatter-type fire smog detector and its light absorber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108573591A (en) * | 2018-07-18 | 2018-09-25 | 中国科学技术大学 | A kind of scatter-type fire smog detector and its light absorber |
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2018
- 2018-07-18 CN CN201821134360.0U patent/CN208706021U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108573591A (en) * | 2018-07-18 | 2018-09-25 | 中国科学技术大学 | A kind of scatter-type fire smog detector and its light absorber |
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