CN111707642B - Multi-light source optical darkroom - Google Patents
Multi-light source optical darkroom Download PDFInfo
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- CN111707642B CN111707642B CN202010697950.XA CN202010697950A CN111707642B CN 111707642 B CN111707642 B CN 111707642B CN 202010697950 A CN202010697950 A CN 202010697950A CN 111707642 B CN111707642 B CN 111707642B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 177
- 239000000428 dust Substances 0.000 claims abstract description 25
- 238000005192 partition Methods 0.000 claims description 11
- 230000001154 acute effect Effects 0.000 claims description 3
- 241000208125 Nicotiana Species 0.000 claims 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims 2
- 239000000779 smoke Substances 0.000 abstract description 30
- 239000002245 particle Substances 0.000 abstract description 20
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 238000000197 pyrolysis Methods 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 abstract description 3
- 238000010411 cooking Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 241000238631 Hexapoda Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0291—Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
- G01J3/4412—Scattering spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
- G01J2003/102—Plural sources
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
The invention discloses a multi-light source optical darkroom, which comprises a dustproof insect-proof net, an optical darkroom, a circuit board and an optical signal sensor, wherein the optical signal sensor is arranged on the circuit board and comprises a backward optical signal transmitting device, a first forward optical signal transmitting device, an optical signal receiving device and a second forward optical signal transmitting device, and the backward optical signal transmitting device, the first forward optical signal transmitting device, the optical signal receiving device and the second forward optical signal transmitting device are respectively arranged in a backward optical signal transmitting device fixing cylinder, a first forward optical signal transmitting device fixing cylinder, an optical signal receiving device fixing cylinder and a second forward optical signal transmitting device fixing cylinder. The multiple light sources can detect a wider spectrum, so that particles with more particle sizes can be identified, and whether particles generated by combustion or pyrolysis are dust, water vapor or oil smoke generated by food oil suspended in air or cooking is judged, and the false alarm rate of the sensor is effectively reduced.
Description
Technical Field
The invention relates to the technical field of fire detection and alarm, in particular to a multi-light-source optical darkroom.
Background
The optical sensor is the most core device of the photoelectric smoke-sensing fire detector, and is an optical signal sensing device which responds to tiny solid or liquid smoke particles generated by combustion or pyrolysis through the scattering and refraction principles of light. Smoke generated by common combustibles can be classified into black smoke and white smoke according to the difference of refractive indexes of smoke particles to incident light. Due to the absorption effect of black smoke particles on light, the scattered light intensity of black smoke particles with the same concentration is far lower than that of white smoke particles. And further, the response of the traditional photoelectric smoke-sensing fire detector to black smoke and white smoke with the same concentration can be greatly different. Furthermore, after the light is scattered by the smoke particles, the light intensity of the scattered light at each angle is different, so that the fire detection principle adopting a single smoke concentration as an alarm threshold value is a technical flaw. A problem may occur in that the detector may not be triggered to alarm when the black smoke concentration is high.
Disclosure of Invention
The invention provides a multi-light source optical darkroom, which can detect a wider spectrum by arranging a multi-light source sensor so as to identify particles with more particle sizes.
The technical scheme of the invention is realized as follows:
The multi-light source optical darkroom is characterized by comprising a dustproof insect-proof net, an optical darkroom, a circuit board and an optical signal sensor, wherein the optical signal sensor is arranged on the circuit board and comprises a backward optical signal transmitting device, a first forward optical signal transmitting device, an optical signal receiving device and a second forward optical signal transmitting device, one ends of the backward optical signal transmitting device, the first forward optical signal transmitting device, the optical signal receiving device and the second forward optical signal transmitting device are arranged on the circuit board, the other ends of the backward optical signal transmitting device, the first forward optical signal transmitting device, the optical signal receiving device and the second forward optical signal transmitting device are respectively arranged in the backward optical signal transmitting device fixing cylinder, the first forward optical signal transmitting device fixing cylinder, the optical signal receiving device fixing cylinder and the second forward optical signal transmitting device fixing cylinder,
The optical darkroom comprises a rear optical signal transmitting device fixing cylinder, a first front optical signal transmitting device fixing cylinder, an optical signal receiving device fixing cylinder and a second front optical signal transmitting device fixing cylinder, wherein the rear optical signal transmitting device fixing cylinder, the first front optical signal transmitting device fixing cylinder, the optical signal receiving device fixing cylinder and the second front optical signal transmitting device fixing cylinder are all cylindrical, the cylindrical cylinder is a reducing cylinder, the axes of light emitting holes of the rear optical signal transmitting device fixing cylinder, the first front optical signal transmitting device fixing cylinder and the second front optical signal transmitting device fixing cylinder are intersected with the axes of light inlet holes of the optical signal receiving device fixing cylinder at one point, and the intersection point is on the axis of an optical darkroom and is far away from the bottom surface of the optical darkroom.
In the multi-light source optical darkroom of the present invention, the angle between the back light signal emitting device fixing cylinder and the light signal receiving device fixing cylinder is an acute angle of 60 ° to 80 °, and the angle between the first front light signal emitting device fixing cylinder and the second front light signal emitting device fixing cylinder and the light signal receiving device fixing cylinder is an obtuse angle of 120 ° to 130 °.
In the multi-light source optical darkroom, the optical darkroom comprises a bottom mounting plate, wherein a flow guide shielding grating is uniformly arranged around the inner side of the bottom mounting plate, and the flow guide shielding grating is distributed around the optical signal sensor in a rotating array with the center of the optical signal sensor as an axis.
In the multi-light source optical darkroom, the flow guide shielding grating is composed of a curved shielding grating and a straight shielding grating, the height of the curved shielding grating is lower than that of the straight shielding grating, and the height of the curved shielding grating plus the height of the enclosing wall is equal to that of the dustproof insect-preventing net.
In the multi-light source optical darkroom, both ends of the curved surface shielding grating and the straight surface shielding grating are provided with tip parts.
In the multi-light source optical darkroom, the flow guide shielding grating is provided with a shielding channel, the shielding channel is formed by matching a first shielding grating and a second shielding grating, and the first shielding grating and the second shielding grating are designed to be wide at the bottom and narrow at the top.
In such a multiple light source optical darkroom of the present invention, the first light shielding grating comprises a first curved light shielding grating and a first straight light shielding grating, and the second light shielding grating comprises a second curved light shielding grating and a second straight light shielding grating.
In such a multi-light source optical darkroom of the present invention, the first straight-face shielding grating is comprised of a first outer straight-face shielding grating and a first inner straight-face shielding grating, the second straight-face shielding grating is comprised of a second outer straight-face shielding grating and a second inner straight-face shielding grating, and the angle of the first outer straight-face shielding grating and the first inner straight-face shielding grating is 120 ° to 130 °.
In the multi-light source optical darkroom of the present invention, the horizontal angle between the first outer straight-face shielding grating and the second outer straight-face shielding grating is 8 ° -10 °, and the horizontal angle between the first inner straight-face shielding grating and the second inner straight-face shielding grating is 8 ° -10 °.
In the multi-light source optical darkroom of the present invention, the width of the first and second inner straight-face shielding gratings near the end of the optical signal sensor is 2mm-3mm, and the width of the first and second inner straight-face shielding gratings far from the end of the optical signal sensor is 2mm-4mm.
In the multi-light source optical darkroom, the first curved surface shielding grating and the second curved surface shielding grating are respectively connected with the first straight surface shielding grating and the second straight surface shielding grating, the width of an inlet channel between the first curved surface shielding grating and the second curved surface shielding grating is 2mm-3mm, and the width of an outlet channel is 2mm-4mm.
In the multi-light source optical darkroom, the dustproof insect-proof net consists of the transverse grid bars and the vertical grid bars, a plurality of smoke inlet mesh openings are formed between the transverse grid bars and the vertical grid bars, and the side length dimension of the smoke inlet mesh openings is smaller than 1mm.
In the multi-light source optical darkroom, the cross sections of the transverse grid bars and the vertical grid bars are isosceles trapezoids, and a plurality of vertical trapezoid notches are formed by arranging a plurality of vertical grid bars.
In the multi-light source optical darkroom, the bottom surface of the dustproof insect-proof net is also designed with a dust trap area, the dust trap area is round, and the dust trap is formed by arranging and combining a plurality of conical protruding parts.
In the multi-light source optical darkroom of the present invention, a surrounding wall is further provided around the inner bottom surface of the dust-proof insect-proof net.
In the multi-light source optical darkroom, the inner surface of the enclosing wall is designed with zigzag convex-concave with an included angle of 60 degrees.
In the multi-light source optical darkroom, a partition vertical face is arranged on the outer side of the enclosing wall, the partition vertical face comprises 8 flow guide grids, the flow guide grids divide the partition vertical face into 8 areas, and the partition vertical face is an arc-shaped face.
In the multi-light source optical darkroom of the present invention, the flow fence comprises a trapezoid end part, and the cross section of the trapezoid end part is the same as the cross section of the vertical trapezoid notch.
In the multi-light source optical darkroom, the dustproof insect-proof net and the optical darkroom are respectively provided with the male buckle and the female buckle, and the dustproof insect-proof net is arranged on the optical darkroom through the buckle structure.
The multi-light source optical darkroom has the following beneficial effects:
(1) The multiple light sources can detect a wider spectrum, so that particles with more particle sizes can be identified, and whether particles generated by combustion or pyrolysis are dust, water vapor or oil smoke generated by food oil suspended in air or cooking is judged, and the false alarm rate of the sensor is effectively reduced.
(2) The position design of the fixing cylinder of the optical signal transmitting and receiving device ensures that 4 axis intersection points intersect with the same point and on the central axis of the darkroom, the purpose is to ensure that the detection areas of the three sensors are the same area, thereby realizing that smoke particles from any direction can be diffused to the detection areas at the same speed. Thereby ensuring the consistency of the sensitivity of the optical darkroom to the smoke azimuth.
(3) The design of dustproof protection against insects net is effectual prevents big granule dust and gets into, prevents the insect to get into, has prevented the influence of dust to sensor sensitivity to the trap that gets into dust setting, has increased the sensitivity of sensor to smog response to the effect of gathering of air current.
Drawings
FIG. 1 is a schematic diagram of the structure of the multi-light source optical darkroom of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the optical sensor and optical darkroom of FIG. 1, with a circuit board omitted;
FIG. 4 is a schematic view of the structure of FIG. 3 in one direction, mainly illustrating the structure of the flow-guiding shielding grating;
FIG. 5 is a schematic view of the structure of FIG. 4 in another direction, showing the direction of intake;
FIG. 6 is a schematic structural diagram of the first and second flow-guiding shielding gratings of FIG. 5;
fig. 7 is a schematic view of the dust-proof insect-proof net in fig. 1;
FIG. 8 is a schematic view of one direction of FIG. 7;
FIG. 9 is another schematic view of FIG. 7;
FIG. 10 is an enlarged schematic view of portion A of FIG. 9;
FIG. 11 is a cross-sectional view taken along A-A of FIG. 8;
Fig. 12 is a B-B cross-sectional view of fig. 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The multi-light source optical darkroom of the present invention, as shown in fig. 1 to 12, comprises a dust-proof insect-proof net 10, an optical darkroom 20, a circuit board 30, and an optical signal sensor mounted on the circuit board 30, the optical signal sensor comprising a backward optical signal emitting device 41, a first forward optical signal emitting device 42, an optical signal receiving device 43, and a second forward optical signal emitting device 44. One ends of the backward optical signal transmitting device 41, the first forward optical signal transmitting device 42, the optical signal receiving device 43, and the second forward optical signal transmitting device 44 are mounted on the circuit board 30, and the other ends are mounted in the backward optical signal transmitting device fixing cylinder 45, the first forward optical signal transmitting device fixing cylinder 46, the optical signal receiving device fixing cylinder 47, and the second forward optical signal transmitting device fixing cylinder 48, respectively.
Wherein, the rear light signal transmitting device fixing cylinder 45, the first front light signal transmitting device fixing cylinder 46, the light signal receiving device fixing cylinder 47 and the second front light signal transmitting device fixing cylinder 48 are all cylindrical, the cylindrical cylinder is a reducing cylinder, the diameter of the light outlet hole of the reducing cylinder is between 3mm and 4mm, the axes of the light outlet holes of the rear light signal transmitting device fixing cylinder 45, the first front light signal transmitting device fixing cylinder 46 and the second front light signal transmitting device fixing cylinder 47 are intersected with the axes of the light inlet holes of the light signal receiving device fixing cylinder 48 at one point, and the intersection point is on the axis of the optical darkroom 20 and far away from the bottom surface of the optical darkroom 20. Therefore, the detection areas of the three optical signal sensors can be the same area, and the effect that smoke particles from any direction can be diffused to the detection area at the same speed is achieved. Thereby ensuring consistency of the sensitivity of the optical darkroom 20 to smoke orientation.
Preferably, the angle between the fixing cylinder 45 and the fixing cylinder 47 is an acute angle of 80 degrees, which utilizes the principle of backward reflection light, and the angle between the fixing cylinder 46 and the fixing cylinder 48 is an obtuse angle of 126 degrees, which utilizes the principle of forward refraction light.
The optical darkroom 20 comprises a bottom mounting plate 21, a flow-guiding shielding grating 22 is arranged around the inner side of the bottom mounting plate 21, and the flow-guiding shielding grating 22 is distributed around the optical signal sensor in a rotating array with the center of the optical signal sensor as an axis.
The diversion shielding grating 22 is composed of a curved shielding grating 221 and a straight shielding grating 222, the height of the curved shielding grating 221 is lower than that of the straight shielding grating 222, the height of the curved shielding grating 221 plus the height of the enclosing wall 50 is equal to that of the dustproof insect-proof net 10, the dustproof insect-proof net 10 is installed behind the optical darkroom 20, the enclosing wall 50 and the curved shielding grating 221 converge external air flow and shield external light, the straight shielding grating 222 is clamped on the inner wall of the enclosing wall 50, the enclosing wall 50 is prevented from loosening, and the installation structure is firm and stable.
Both ends of the curved surface shielding grating 221 and the straight surface shielding grating 222 are provided with tip portions 224, and the tip portions 224 can reduce the obstruction to air flow, so that smoke particles can quickly enter the labyrinth, and the sensitivity of the optical signal sensor is improved.
The flow-guiding shielding grating 22 is provided with a shielding channel, the shielding channel is formed by matching a first shielding grating 23 and a second shielding grating 24, and the first shielding grating 23 and the second shielding grating 24 are designed to be wide at the bottom and narrow at the top. The shielding grating reduces the obstruction to the air flow in the air inlet or outlet process of the smoke, so that the air flow can fly in or fly out more easily, the optical signal sensor can detect the surrounding smoke change more easily, and the response of the optical signal sensor is more sensitive; meanwhile, the smoke is easy to float, so that the optical signal sensor reduces the false alarm phenomenon caused by smoking of people in the detection space.
The first shielding grating 23 includes a first curved surface shielding grating 231 and a first straight surface shielding grating 232, the second shielding grating 24 includes a second curved surface shielding grating 241 and a second straight surface shielding grating 242, wherein the first straight surface shielding grating 232 is composed of a first outer straight surface shielding grating 233 and a first inner straight surface shielding grating 234, the second straight surface shielding grating 242 is composed of a second outer straight surface shielding grating 243 and a second inner straight surface shielding grating 244, an angle of the first outer straight surface shielding grating 233 and the first inner straight surface shielding grating 234 is 125 °, a horizontal angle of the first outer straight surface shielding grating 233 and the second outer straight surface shielding grating 243 is 10 °, and a horizontal angle of the first inner straight surface shielding grating 234 and the second inner straight surface shielding grating 244 is 10 °. The width of the ends of the first and second inner straight-face shields 234, 244 near the optical signal sensor is 3mm, and the width of the ends of the first and second inner straight-face shields 234, 244 far from the optical signal sensor is 4mm.
The first curved surface shielding grating 231 and the second curved surface shielding grating 241 are connected to the first straight surface shielding grating 232 and the second straight surface shielding grating 242, respectively, the width of the inlet channel between the first curved surface shielding grating 231 and the second curved surface shielding grating 241 is 3mm, and the width of the outlet channel is 4mm. The shading channel adopts the design of a crescent shape with two sections of narrow middle width, so that most of external light can be prevented from entering the optical darkroom, and even if the shading channel is used, the reflection and scattering phenomena are continuously generated in the middle area of the shading channel for weakening the light, and the interference of the external light to the optical darkroom is effectively avoided. The above interval density of the flow-guiding shielding gratings 22 can ensure that light emitted from the outside cannot enter the darkroom, the number of the flow-guiding shielding gratings 22 can be reduced to a certain extent, the manufacturing cost is reduced, and under the convergence effect of external air flow, surrounding smoke dust can smoothly enter the optical darkroom, so that the detection sensitivity of the optical signal sensor is improved.
The dustproof insect-proof net 10 is composed of a transverse grid bar 101 and a vertical grid bar 102, a plurality of smoke inlet mesh holes 106 are formed between the transverse grid bar 101 and the vertical grid bar 102, the side length of the smoke inlet mesh holes 106 is smaller than 1mm, and the smoke particles can be prevented from entering while entering. The cross sections of the transverse grid bars 101 and the vertical grid bars 102 are isosceles trapezoids, so that the obstruction to the entry or the drift of the smoke particles inside and outside is effectively reduced, and false alarm is prevented. A plurality of vertical trapezoid notches 103 are formed between the plurality of vertical bars 102.
The bottom surface of the insect-proof dust net 10 is also designed with a dust trap area 104, the dust trap area 104 is circular, and the dust trap 104 is formed by arranging and combining a plurality of conical protruding parts 105. After the dust entering the optical darkroom 20 naturally subsides, the dust falls into the root of the conical boss 105, which is a region where the emitted light cannot reach, and belongs to a dust trap, so that the change of a received signal cannot be affected by the scattering of the emitted light by the dust, and the design improves the dust pollution resistance of the optical signal sensor.
The dust-proof insect-proof net 10 is also provided with a surrounding wall 50 around the inner bottom surface thereof for intercepting dust particles from directly entering the interior of the darkroom, particularly for preventing dust from entering the inner bottom surface of the darkroom, and preventing the influence of external turbulence air flow on the inner trapped area of the darkroom, so as to prevent the root dust of the conical protruding part from floating. The inner surface of the enclosing wall 50 is designed with saw-tooth convex-concave 51 with an included angle of 60 degrees, so that the light emitted by the optical signal emitting device is absorbed by multiple reflection in the groove.
The outside of enclosure 50 is equipped with partition facade 52, and partition facade 52 includes 8 air bars 53, and air bars 53 are 8 regions with partition facade 52, and partition facade 52 is the arcwall face, further reduces the hindrance at the air inlet or the air outlet of smog, plays the effect of gathering to the air current, avoids the air current to run off from the enclosure outside, has increased the sensitivity of optical signal sensor to smog response.
The air fence 53 comprises a trapezoid end 531, the cross section of the trapezoid end 531 is the same as that of the vertical trapezoid notch 103, and the trapezoid end 531 is clamped into the vertical trapezoid notch 103, so that the enclosing wall 50 is fixed in the dustproof insect-proof net 10, and the installation and the disassembly are convenient.
Preferably, the male buckle 105 and the female buckle 201 are respectively arranged on the dustproof insect-proof net 10 and the optical darkroom 20, the dustproof insect-proof net 10 is arranged on the optical darkroom through a buckle structure, so that the dustproof insect-proof net is convenient to detach and install, and particularly dust in the dustproof insect-proof net 10 is conveniently cleaned regularly, and the sensitivity of the optical signal sensor is ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (3)
1. A multi-light source optical darkroom, characterized in that: comprises a dustproof insect-proof net, an optical darkroom, a circuit board and an optical signal sensor, wherein the optical signal sensor is arranged on the circuit board and comprises a backward optical signal transmitting device, a first forward optical signal transmitting device, an optical signal receiving device and a second forward optical signal transmitting device, one ends of the backward optical signal transmitting device, the first forward optical signal transmitting device, the optical signal receiving device and the second forward optical signal transmitting device are arranged on the circuit board, the other ends of the backward optical signal transmitting device, the first forward optical signal transmitting device, the optical signal receiving device and the second forward optical signal transmitting device are respectively arranged in a backward optical signal transmitting device fixing cylinder, a first forward optical signal transmitting device fixing cylinder, an optical signal receiving device fixing cylinder and a second forward optical signal transmitting device fixing cylinder,
The optical system comprises a rear optical signal transmitting device fixing cylinder, a first front optical signal transmitting device fixing cylinder, an optical signal receiving device fixing cylinder and a second front optical signal transmitting device fixing cylinder, wherein the rear optical signal transmitting device fixing cylinder, the first front optical signal transmitting device fixing cylinder and the second front optical signal transmitting device fixing cylinder are all cylindrical cylinders, the cylindrical cylinders are reducing cylinders, the axes of light outlet holes of the rear optical signal transmitting device fixing cylinder, the first front optical signal transmitting device fixing cylinder and the second front optical signal transmitting device fixing cylinder are intersected with the axes of light inlet holes of the optical signal receiving device fixing cylinder at one point, the intersection point is on the axis of the optical darkroom and far away from the bottom surface of the optical darkroom, an acute angle of 60-80 degrees is formed between the rear optical signal transmitting device fixing cylinder and the optical signal receiving device fixing cylinder, an obtuse angle of 120-130 degrees is formed between the first front optical signal transmitting device fixing cylinder and the second front optical signal transmitting device fixing cylinder and the optical signal receiving device fixing cylinder, and the angle of 120-130 degrees is formed by utilizing the forward refraction principle; and
A surrounding wall is arranged around the inner bottom surface of the dustproof insect-proof net,
The optical darkroom comprises a bottom mounting plate, the periphery of the inner side of the bottom mounting plate is uniformly provided with a flow guide shielding grating, the flow guide shielding grating is distributed around the optical signal sensor in a rotary array by taking the center of the optical signal sensor as an axis,
The flow guide shielding grating consists of a curved shielding grating and a straight shielding grating, the height of the curved shielding grating is lower than that of the straight shielding grating,
The height of the curved surface shielding grating plus the height of the enclosing wall is equal to the height of the dustproof insect-proof net,
The flow-guiding shielding grating is provided with a shielding channel, the shielding channel is formed by matching a first shielding grating and a second shielding grating, the first shielding grating and the second shielding grating are designed to be wide at the bottom and narrow at the top,
Both ends of the curved surface shielding grating and the straight surface shielding grating are provided with tip parts; the first light shielding grating comprises a first curved surface light shielding grating and a first straight surface light shielding grating, the second light shielding grating comprises a second curved surface light shielding grating and a second straight surface light shielding grating, wherein the first straight surface light shielding grating consists of a first outer straight surface light shielding grating and a first inner straight surface light shielding grating, the second straight surface light shielding grating consists of a second outer straight surface light shielding grating and a second inner straight surface light shielding grating, the angle of the first outer straight surface light shielding grating and the first inner straight surface light shielding grating is 125 degrees, the horizontal included angle of the first outer straight surface light shielding grating and the second outer straight surface light shielding grating is 10 degrees, and the horizontal included angle of the first inner straight surface light shielding grating and the second inner straight surface light shielding grating is 10 degrees; the width of one end, close to the optical signal sensor, of the first inner straight-face shielding grating and the second inner straight-face shielding grating is 3mm, and the width of one end, far away from the optical signal sensor, of the first inner straight-face shielding grating and the second inner straight-face shielding grating is 4mm; the first curved surface shielding grating and the second curved surface shielding grating are respectively connected with the first straight surface shielding grating and the second straight surface shielding grating, the width of an inlet channel between the first curved surface shielding grating and the second curved surface shielding grating is 3mm, and the width of an outlet channel is 4mm; the shading channel adopts a crescent design with two sections of narrow and middle wide;
The dustproof insect-proof net consists of a transverse grid bar and a vertical grid bar, a plurality of tobacco inlet mesh openings are formed between the transverse grid bar and the vertical grid bar, the side length dimension of the tobacco inlet mesh openings is smaller than 1mm,
The cross sections of the transverse grid bars and the vertical grid bars are isosceles trapezoids, a plurality of vertical trapezoid notches are formed by arranging a plurality of vertical grid bars,
The outer side of the enclosing wall is provided with a partition vertical face which comprises 8 diversion grids, the diversion grids divide the partition vertical face into 8 areas, and the partition vertical face is an arc-shaped face;
the flow guide grating comprises a trapezoid end part, the cross section of the trapezoid end part is the same as that of the vertical trapezoid notch, and the trapezoid end part is clamped into the vertical trapezoid notch, so that the enclosing wall is fixed in the dustproof insect-proof net;
The dustproof insect-proof net and the optical darkroom are respectively provided with a male buckle and a female buckle, and the dustproof insect-proof net is arranged on the optical darkroom through a buckle structure.
2. The multi-light source optical darkroom according to claim 1, wherein the bottom surface of the dust-proof insect-proof net is further designed with a dust trap area, the dust trap area is circular, and the dust trap is formed by arranging and combining a plurality of conical protrusions.
3. The multi-light source optical darkroom according to claim 1 wherein the interior surface of the perimeter wall is configured with saw tooth shaped projections and depressions having an included angle of 60 °.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010697950.XA CN111707642B (en) | 2020-07-20 | 2020-07-20 | Multi-light source optical darkroom |
| PCT/CN2020/123462 WO2022016716A1 (en) | 2020-07-20 | 2020-10-24 | Multi-light-source optical dark chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010697950.XA CN111707642B (en) | 2020-07-20 | 2020-07-20 | Multi-light source optical darkroom |
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| CN111707642A CN111707642A (en) | 2020-09-25 |
| CN111707642B true CN111707642B (en) | 2024-08-13 |
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| CN111707642B (en) * | 2020-07-20 | 2024-08-13 | 九江珀伽索斯科技有限公司 | Multi-light source optical darkroom |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107516396A (en) * | 2017-09-05 | 2017-12-26 | 深圳市泰和安科技有限公司 | A kind of two-way photoelectric smoke sensor |
| CN110766906A (en) * | 2015-05-15 | 2020-02-07 | 谷歌有限责任公司 | Smoke detector chamber structure and related method |
| CN212228735U (en) * | 2020-07-20 | 2020-12-25 | 九江珀伽索斯科技有限公司 | Multi-light-source optical darkroom |
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| US4642615A (en) * | 1984-07-31 | 1987-02-10 | Nittan Company, Limited | Light-scattering type smoke detector |
| US7270274B2 (en) * | 1999-10-04 | 2007-09-18 | Hand Held Products, Inc. | Imaging module comprising support post for optical reader |
| CN200965720Y (en) * | 2006-11-14 | 2007-10-24 | 王殊 | Backward scatter optical dark chamber |
| DE102011119431C5 (en) * | 2011-11-25 | 2018-07-19 | Apparatebau Gauting Gmbh | Stray radiation fire detector and method for automatically detecting a fire situation |
| GB2514180A (en) * | 2013-05-17 | 2014-11-19 | Nanomex Ltd | An optical inspection system |
| CN203673614U (en) * | 2013-12-26 | 2014-06-25 | 深圳市泛海三江电子有限公司 | Optical darkroom and smoke-temperature composite fire detector |
| CN204256879U (en) * | 2014-12-08 | 2015-04-08 | 王殊 | A kind of diffuse transmission type smoke detector optical dark room |
| CN108447217A (en) * | 2018-02-06 | 2018-08-24 | 深圳市泛海三江电子股份有限公司 | A kind of compact sized optical darkroom |
| CN111707642B (en) * | 2020-07-20 | 2024-08-13 | 九江珀伽索斯科技有限公司 | Multi-light source optical darkroom |
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2020
- 2020-07-20 CN CN202010697950.XA patent/CN111707642B/en active Active
- 2020-10-24 WO PCT/CN2020/123462 patent/WO2022016716A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110766906A (en) * | 2015-05-15 | 2020-02-07 | 谷歌有限责任公司 | Smoke detector chamber structure and related method |
| CN107516396A (en) * | 2017-09-05 | 2017-12-26 | 深圳市泰和安科技有限公司 | A kind of two-way photoelectric smoke sensor |
| CN212228735U (en) * | 2020-07-20 | 2020-12-25 | 九江珀伽索斯科技有限公司 | Multi-light-source optical darkroom |
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| CN111707642A (en) | 2020-09-25 |
| WO2022016716A1 (en) | 2022-01-27 |
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