CN109754565A - A photoelectric smoke detection darkroom - Google Patents
A photoelectric smoke detection darkroom Download PDFInfo
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- CN109754565A CN109754565A CN201910086445.9A CN201910086445A CN109754565A CN 109754565 A CN109754565 A CN 109754565A CN 201910086445 A CN201910086445 A CN 201910086445A CN 109754565 A CN109754565 A CN 109754565A
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- convex lens
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- darkroom
- baffle
- conical surface
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- 239000000779 smoke Substances 0.000 title claims abstract description 54
- 238000001514 detection method Methods 0.000 title claims abstract description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- 230000007704 transition Effects 0.000 claims description 2
- 230000008676 import Effects 0.000 description 20
- 239000002245 particle Substances 0.000 description 18
- 230000003287 optical effect Effects 0.000 description 9
- 239000007787 solid Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 230000001795 light effect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
本发明公开了一种光电感烟烟雾探测暗室，包括壳体、凸透镜、光源和光电接收管，其中，所述壳体围成暗室的腔室，壳体内部设置有挡板，挡板将暗室分隔成第一部分和第二部分，所述第一部分的壳体上设置圆锥面，第二部分的壳体上设置所述凸透镜和光源，光源设置于凸透镜的焦点上；所述挡板上设置有通孔，凸透镜位于光源和挡板之间，且圆锥面和凸透镜共轴设置，所述通孔完全覆盖凸透镜的发射光路；所述第一部分的侧壁上设置有第一格栅，第一格栅设置于圆锥面的侧面；所述壳体上设置有进口和出口。
The invention discloses a photoelectric smoke detection darkroom, comprising a casing, a convex lens, a light source and a photoelectric receiving tube, wherein the casing encloses a chamber of the darkroom, a baffle is arranged inside the casing, and the baffle closes the darkroom It is divided into a first part and a second part, the casing of the first part is provided with a conical surface, the casing of the second part is provided with the convex lens and the light source, and the light source is set on the focal point of the convex lens; the baffle is provided with A through hole, the convex lens is located between the light source and the baffle, and the conical surface and the convex lens are coaxially arranged, the through hole completely covers the emission light path of the convex lens; the side wall of the first part is provided with a first grid, the first grid The grid is arranged on the side of the conical surface; an inlet and an outlet are arranged on the casing.
Description
Technical field
The invention belongs to fire hazard aerosol fog detection technology field more particularly to a kind of photoelectric smoke smoke detection optical dark rooms.
Background technique
Photo-electric type smoke detector is made of light source, photoelectric cell, electronic switch and type chamber secret room mazy, utilizes light
The smog that scattering principle generates Initial Stage of Fire detects, and issues alarm signal in time.Photo-electric type smoke detector according to
Its structure and principle are divided into Sun-shading type and two kinds of scatter-type, wherein the light emitting diode of scattering type photoelectric formula smoke detector and
The position of light-sensitive element setting be not it is opposite, light-sensitive element is arranged in porous small darkroom, and when non smoke, light cannot be mapped to
On light-sensitive element, circuit maintains normal condition, and occur in the presence of fire has smog, light passes through the reflection or scattering of smoke particle
Reach on light-sensitive element, then optical signal is converted into electric signal, photosensitive since the signal that light-sensitive element is an actually-received is very faint
Element and processing chip between need to be filtered signal and enhanced processing after could identify, then drive warning device, hair
Fire alarm signal out.In the processing links of signal, small-signal is very easy to be disturbed, and interference can also be amplified place
Reason is easy to influence the sensitivity and stability of detection result.
Moreover, the surrounding in the darkroom of existing photo-electric type smoke detector is provided with porous structure, after smog enters darkroom,
It is easy to happen turbulent flow, the solid particle in smog is detected by optical path repeatedly, the sensitivity and accuracy of severe jamming detection.
In addition, if the light that light source issues passes through smog direct irradiation on the side wall in darkroom, even if darkroom side wall is by frosted etc.
Reason, is also inevitably generated the transmitting and scattering of light, if the light of reflection and scattering is received by light-sensitive element, just will affect spy
Survey the sensitivity and accuracy of result.
Summary of the invention
In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a kind of spies of photoelectric smoke smog
Darkroom and smoke detection method are surveyed, which is directional light the scattering light convergence of light source by lens, passes through the special of darkroom
The light multiple reflections that structure prevents light source from issuing enter reception pipe.One focus ball of reception pipe face can more effectively connect simultaneously
The light of smog reflection is received, the intensity for the original signal that reception pipe receives is improved, effectively improves sensitivity and stability.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
A kind of photoelectric smoke smoke detection darkroom, including shell, convex lens, light source and photoelectric receiving tube, wherein the shell
Body surrounds the chamber in darkroom, and enclosure interior is provided with baffle, and darkroom is separated into first part and second part by baffle, and described
Circular conical surface is set on the shell of a part, the convex lens and light source are set on the shell of second part, and light source is set to convex lens
In the focus of mirror；
Through-hole is provided on the baffle, convex lens is between light source and baffle, and circular conical surface and convex lens is coaxial sets
It sets, the transmitting optical path of convex lens is completely covered in the through-hole；
The first grid is provided on the side wall of the first part, the first grid is set to the side of circular conical surface, the first lattice
The end of the close circular conical surface of grid is provided with chamfering, and chamfering is arranged towards circular conical surface；
Chamfering is arranged towards circular conical surface, it can be understood as plane and the bus apart from nearest circular conical surface are basic where chamfering
In parallel.
The shell is provided with inlet and outlet, and inlet and outlet is set to second part, and inlet and outlet distinguishes position
In the two sides of circular conical surface and convex lens line；
Above-mentioned circular conical surface and convex lens line, which is the tie-portion between circular conical surface and convex lens, is not
Straight line where circular conical surface and convex lens.
The photoelectric receiving tube is set on housing wall, and smoke path between inlet and outlet and convex lens
Emit the side of optical path intersecting area.
Photoelectric receiving tube is set to the bottom surface of the intersecting area, can receive the light of solid particle scattering, and by the light
Signal is converted to electric signal, for exporting.
Light source is set to the focal position of convex lens, and the focusing light effect for the light planoconvex lens that light source is launched forms a branch of flat
Row light.The two sides of the beam directional light are arranged in the inlet and outlet of shell, so that smog enters from import, from outlet outflow, cigarette
Smoke path of the mist in second part intersects with directional light, forms an intersecting area, in the area, the solid in smog
Grain generates scattering process to light.
At first part and second part, circular cone is arranged on the side wall of first part by barrier partitions in the chamber that shell surrounds
Face, and the circular conical surface is coaxial with convex lens, the collimated light beam that convex lens is launched passes through the space of second part and passes through baffle
On through-hole, be radiated on circular conical surface, collimated light beam is under the reflection and scattering process of circular conical surface to the side wall four of first part
Week transmitting.The first grid, the end face of the close circular conical surface of the first grid are provided on the side wall of the first part of circular cone side
Chamfering is set, which is arranged towards circular conical surface, and the light of circular cone surface launching and scattering is radiated on the first grid, and by falling
The reflex at angle makes light reflect, scatter repeatedly between circular conical surface and the first grid, and then is completely absorbed.
Through-hole on baffle allows passing through for collimated light beam, be irradiated into the light of darkroom first part circular conical surface,
It is limited in first part under the collective effect of first grid and baffle, and then is completely absorbed, prevents light from reentering
The detection zone of second part, so that the optical signal that photoelectric receiving tube receives is only solid particle reflection and scattering in smog
Light, with improve detection sensitivity and accuracy.
Further, the diameter phase of the diameter for the through-hole being arranged on the baffle and the collimated light beam issued by convex lens
Deng or it is slightly larger.The through-hole only allows collimated light beam to pass through, and prevents the reflection light of first part and scattering light from passing through.
Further, the import is vertical with the transmitting light of convex lens with the line of outlet.
Further, focus ball is provided between the intersecting area and photoelectric receiving tube, the diameter of focus ball is greater than light
The diameter of electric reception pipe.Focus ball can receive the light that solid particle scatters in smog in a big way, and to the part
Light is emitted in photoelectric receiving tube after being focused, and substantially increases the signal strength of incident ray.Without carrying out signal
Under the premise of amplification, there is preferable detectivity and accuracy.Focus ball between intersecting area and photoelectric receiving tube,
That is, focus ball not in intersecting area, will not generate interference to light and smoke flow.
Further, the second grid is provided on the side wall opposite with focus ball of the shell.
Further, second grid is concentric structure, and the end of the grid of center is provided with chamfering.It dissipates
Be mapped to after the slant reflection that the light of the second grid can be chamfered grid multiple reflection inside weaken, or be reflected into shell
On side wall, it is absorbed.
Further, the shell is square structure.
Further, inlet channel is provided in the import, buffer area and air inlet area, buffer area is arranged in inlet channel
Between import and air inlet area, and the cross-sectional area of the buffer area is greater than the cross-sectional area of import, the cigarette of the air inlet area
Flow of air direction is vertical with collimated light beam.
Further, the air inlet area is staggered with the import, and the position that channel turns to uses arc-shaped transition structure.
Buffer area is set in inlet channel, and flow into enclosure interior has different in flow rate and flow to flue gas and carry out in buffer area
Buffering, homogenizing, make flue gas have more consistent flow velocity and flow direction.Air inlet area is to carry out water conservancy diversion to the flue gas by buffering, into
Gas area is staggered with import, on the one hand makes flue gas along specific direction, is more smoothly introduced into enclosure interior, avoids in detection zone
Turbulent flow is generated, the smoke particle for guaranteeing to enter in the tested gas in darkroom only can be above focus ball by once, guaranteeing detection
On the other hand the accuracy of the smoke particle concentration arrived can prevent external complex environment from causing shadow to the detection inside darkroom
It rings, improves the independence in darkroom.
Further, deflector is provided in the middle part of the buffer area, deflector is arranged along flow of flue gas direction.This is led
Inlet channel is separated into two channels by flowing plate, can play the role of stopping reduction of speed to flue gas, so that the flue gas in inlet channel
Flow velocity reaches unanimity.
Further, the outlet is provided with outlet passageway, and the structure of outlet passageway and the structure of inlet channel are identical.
Further, the inner wall frosted processing of shell.In favor of the light absorption of inner wall will be scattered to.
A kind of photoelectric smoke smoke detection system, including above-mentioned photoelectric smoke smoke detection darkroom, processor and alarm dress
It sets, the photoelectric receiving tube in photoelectric smoke smoke detection darkroom is connect with processor, and processor is connect with warning device.
Processor receives the light intensity signal of photoelectric receiving tube transmitting, the quantity and concentration of smoke particle is calculated, if greatly
In the upper limit value of setting, processor drives warning device alarm.
The invention has the benefit that
Tested gas enters from the side in darkroom, and other side discharge, air inlet and air outlet have the channel of rectification, with three
Channel is divided into two-way by a spacer, and the fillet and tilt angle for designing spacer guarantee that air-flow is smooth in darkroom internal flow,
Turbulent flow is not had above focus ball, guaranteeing to enter the smoke particle in the tested gas in darkroom can only pass through above focus ball
Once, guarantee the accuracy of smoke particle concentration detected.
The first grid, the end face of the close circular conical surface of the first grid are provided on the side wall of the first part of circular cone side
Chamfering is set, which is arranged towards circular conical surface, and the light of circular cone surface launching and scattering is radiated on the first grid, and by falling
The reflex at angle makes light reflect, scatter repeatedly between circular conical surface and the first grid, and then is completely absorbed.On baffle
Through-hole allow collimated light beam to pass through, be irradiated into the light of darkroom first part in circular conical surface, the first grid and baffle
Collective effect under be limited in first part, and then be completely absorbed, prevent light from reentering the detection of second part
Region, so that the optical signal that photoelectric receiving tube receives is only the light of the solid particle reflection and scattering in smog, to improve
The sensitivity and accuracy of detection.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the decomposition diagram of the photoelectric smoke detection darkroom structure of one embodiment of the present of invention；
Fig. 2 is the cross-sectional view of the photoelectric smoke detection darkroom structure of one embodiment of the present of invention；
Fig. 3 is the three-dimensional view of the shell of one embodiment of the present of invention；
Fig. 4 is the top view of the shell of one embodiment of the present of invention；
Fig. 5 is the three-dimensional view of the upper cover of one embodiment of the present of invention.
Wherein, 1, shell, 1-1, import, 1-2, first passage, 1-3, through-hole, 1-4, the first grid, 1-5, outlet, 1-6,
Second channel, 2, upper cover, 2-1, circular conical surface, 2-2, the second grid, 2-3, card slot, 3, convex lens, 4, light source, 5, focus ball, 6,
Wiring board, 6-1, photoelectric receiving tube, 6-2, processor.
Specific embodiment
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As depicted in figs. 1 and 2, a kind of photoelectric smoke smoke detection darkroom, including shell 1, convex lens 3, light source 4 and photoelectricity
Reception pipe 6-1, wherein the shell 1 surrounds the chamber in darkroom, and shell 1 is internally provided with baffle, and darkroom is separated by baffle
Circular conical surface 2-1 is arranged on the shell of the first part, is arranged on the shell of second part described convex for a part and second part
Lens 3 and light source 4, light source 4 are set in the focus of convex lens 3, and light source 4 can be LED light, laser etc.；
Through-hole is provided on the baffle, convex lens 3 is between light source 4 and baffle, and circular conical surface 2-1 and convex lens 3
The transmitting optical path of convex lens 3 is completely covered in coaxial setting, the through-hole, that is, the diameter of collimated light beam is less than or equal to through-hole
Diameter.Light source 4 is set to the focal position of convex lens 3, and the focusing light effect for the light planoconvex lens 3 that light source is launched forms a branch of flat
Row light.
It is provided with the first grid 1-4, the first grid 1-4 on the side wall of the first part and is set to the side of circular conical surface 2-1
Face, the end of the close circular conical surface 2-1 of the first grid 1-4 are provided with chamfering, and chamfering is arranged towards circular conical surface 2-1；
It is provided with import 1-1 and outlet 1-5, import 1-1 on the shell 1 and outlet 1-5 is set to second part, and into
Mouth 1-1 and outlet 1-5 is located at the two sides of 3 line of circular conical surface 2-1 and convex lens；Further, import 1-1 and outlet 1-5
Line it is vertical with the transmitting light of convex lens 3.
As shown in Figure 3 and Figure 4, inlet channel is provided in import 1-1, buffer area and air inlet area is arranged in inlet channel, delays
Area is rushed between import and air inlet area, and the cross-sectional area of the buffer area is greater than the cross-sectional area of import, the air inlet area
Flow of flue gas direction it is vertical with collimated light beam.Air inlet area is staggered with the import, and the position that channel turns to uses arc mistake
Cross structure.Deflector is provided in the middle part of buffer area, deflector is arranged along flow of flue gas direction.The deflector divides inlet channel
Two channels are divided into, can play the role of stopping reduction of speed to flue gas, so that the flue gas flow rate in inlet channel reaches unanimity.Outlet
It is provided with outlet passageway, the structure of outlet passageway and the structure of inlet channel are identical.
The photoelectric receiving tube 6-1 is set on housing wall, and is located at import 1-1 and is exported the smoke path between 1-5
With the side of the transmitting optical path intersecting area of convex lens 3.The intersecting area of smoke path and collimated light beam and photoelectric receiving tube it
Between be provided with focus ball 5, the diameter of focus ball 5 is greater than the diameter of photoelectric receiving tube.Focus ball 5 is the sphere of transparent material.It is poly-
Focal sphere 5 can receive the light that solid particle scatters in smog in a big way, and roll over after being focused to some light
It is mapped in photoelectric receiving tube 6-1, substantially increases the signal strength of incident ray.Under the premise of being not necessarily to carry out signal amplification,
With preferable detectivity and accuracy.Focus ball is between intersecting area and photoelectric receiving tube, that is, focus ball does not exist
In intersecting area, interference will not be generated to light and smoke flow.
As shown in figure 5, being provided with the second grid 2-2 on the side wall opposite with focus ball 5 of shell 1.Second grid 2-2 is
The end of concentric structure, the grid of center is provided with chamfering.It is anti-to scatter to the inclined-plane that the light of the second grid can be chamfered
After penetrating grid multiple reflection inside weaken, or be reflected on the side wall of shell and be absorbed.The inner wall frosted of shell is handled.
In favor of the light absorption of inner wall will be scattered to.
The two sides of the beam directional light are arranged in the import 1-1 and outlet 1-5 of shell 1, so that smog enters from import 1-1,
From outlet 1-5 outflow, smoke path of the smog in second part intersects with directional light, an intersecting area is formed, in the region
Interior, the solid particle in smog generates scattering process to light.
The structure of shell 1 can be sphere, cylindrical body, prism or rectangular parallelepiped structure, be shell shown in Fig. 1-Fig. 5
For the embodiment of rectangular parallelepiped structure, it is specifically described below with reference to this kind of situation.
As shown in Figure 1, shell 1 includes separable upper cover 2, intermediate region and bottom in the embodiment.It is set in upper cover 2
It is equipped with grab, card slot 2-3, upper cover 2 and enclosure body are provided on the shell of intermediate region and is connected by grab with card slot 2-3.
Light source 4, convex lens 3, through-hole 1-3, circular conical surface 2-1 center in same straight line.
As shown in Figure 3 and Figure 4, the opposite two sides of the rectangular intermediate region be respectively set relatively independent first area and
The first grid 1-4 is arranged on the side wall of first area, light source 4 and convex lens 3, light is arranged in second area for second area
Source 4 is set in the focus of convex lens 3, other directions of light source 4 are isolated by baffle, i.e., light source 4 emit light only
Emitted by convex lens 3 into darkroom.The light that light source 4 emits can be pooled parallel rays transmitting by convex lens 3.
The focus ball 5 of 1 bottom surface of shell is fastened by the semicircle groove of two sidewalls and is fixed.Wiring board 6 is fixed by four screws
On 1 wall of shell, the center photoelectric receiving tube 6-1 on the center and wiring board 6 of focus ball 5 is in same vertical direction.Light source 4 is sent out
Light out pools directional light by lens 3 and passes through 5 top of focus ball.
Tested gas enters from the import 1-1 of darkroom side, the outlet 1-5 discharge of the other side.Import 1-1 and outlet 1-5
There are the first passage 1-2 and second channel 1-6 of rectification, respectively there are three spacers logical by first passage 1-2 and second channel 1-6
Road is divided into two-way.The fillet and tilt angle for designing spacer guarantee that air-flow is smooth in darkroom internal flow, above focus ball 5
Do not have turbulent flow.The smoke particle for guaranteeing to enter in the tested gas in darkroom only can be above focus ball 5 by primary, and guarantee is visited
The accuracy of the smoke particle concentration measured.
As shown in Figure 2 and Figure 5, lid and lateral plate body are provided in upper cover 2, lateral plate body is vertical with lid, lateral plate
The cone is set on body, and the surface of cone forms circular conical surface.The second grid 2-2, the second grid 2-2 is arranged on lid is
Concentric loop structure.When the lid of upper cover 2 closes, lateral plate body closes the first area of intermediate region, at this point, the in first area
One grid 1-4 is located exactly at the side of cone, and the second grid 2-2 is located at the opposite side of focus ball 5, the light of cone reflection
On the first grid 1-4, light back and forth irradiates direct irradiation between the first grid and circular conical surface, is gradually absorbed.Second grid
2-2 leans on paracentral side chamfered.The light for scattering to grid can be chamfered after slant reflection in grid 2-2 multiple reflection inside
Weaken, or is reflected into the side wall of detection cavity.The side wall frosted of detection cavity is handled, and absorbs and subtract transonic light.
If not having smoke particle in tested air-flow, light directly passes through, and does not have scattering light line focus ball 5 and enters photoelectricity
Reception pipe 6-1.If there is smoke particle in tested air-flow, it can scatter or reflection source 4 is by the parallel of the convergence of convex lens 3
Light, has scattering or reflected light line focus ball 5 converges to photoelectric receiving tube 6-1.According to the light intensity received, photoelectric receiving tube 6-
1 and processor 6-2 can calculate the quantity and concentration of smoke particle.
In addition, specifically, a kind of photoelectric smoke smoke detection system, including above-mentioned photoelectric smoke smoke detection darkroom, place
Reason device and warning device, the photoelectric receiving tube in photoelectric smoke smoke detection darkroom are connect with processor, processor and alarm
Device connection.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910086445.9A CN109754565B (en) | 2019-01-29 | 2019-01-29 | Photoelectric smoke sensing dark room for smoke detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910086445.9A CN109754565B (en) | 2019-01-29 | 2019-01-29 | Photoelectric smoke sensing dark room for smoke detection |
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| CN109754565A true CN109754565A (en) | 2019-05-14 |
| CN109754565B CN109754565B (en) | 2020-12-22 |
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Cited By (1)
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|---|---|---|---|---|
| CN117175045A (en) * | 2023-11-02 | 2023-12-05 | 安徽中科中涣智能装备股份有限公司 | Battery box thermal runaway detection device based on spectrum |
| CN117175045B (en) * | 2023-11-02 | 2024-03-22 | 安徽中科中涣智能装备股份有限公司 | Battery box thermal runaway detection device based on spectrum |
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