WO2022016716A1

WO2022016716A1 - Multi-light-source optical dark chamber

Info

Publication number: WO2022016716A1
Application number: PCT/CN2020/123462
Authority: WO
Inventors: 何祥新
Original assignee: 九江珀伽索斯科技有限公司
Priority date: 2020-07-20
Filing date: 2020-10-24
Publication date: 2022-01-27
Also published as: CN111707642B; CN111707642A

Abstract

A multi-light-source optical dark chamber, comprising a dustproof and insect-proof net (10), an optical dark chamber (20), a circuit board (30) and an optical signal sensor, wherein the optical signal sensor is arranged on the circuit board (30) and comprises a backward optical signal transmitting device (41), a first forward optical signal transmitting device (42), an optical signal receiving device (43) and a second forward optical signal transmitting device (44); and 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 respectively mounted in a backward optical signal transmitting device fixing tube (45), a first forward optical signal transmitting device fixing tube (46), an optical signal receiving device fixing tube (47) and a second forward optical signal transmitting device fixing tube (48). The optical dark chamber can detect a wider spectrum and can then identify particles with more particle sizes, and can thus determine whether the particles are those generated by combustion or pyrolysis, or are dust and water vapor suspended in the air, or are oil fumes generated by food oil during cooking, thereby effectively reducing the false alarm rate of a sensor.

Description

A multi-light source optical darkroom

technical field

The invention relates to the technical field of fire detection and alarm, and more particularly, to a multi-light source optical darkroom.

Background technique

Optical sensor is the core device of photoelectric smoke and fire detector. It is an optical light signal sensor device that responds to tiny solid or liquid smoke particles generated by combustion or pyrolysis through the principle of light scattering and refraction. The smoke produced by common combustion materials can be divided into black smoke and white smoke according to the difference in the refractive index of the smoke particles to the incident light. Due to the absorption effect of black smoke particles on light, the scattered light intensity of black smoke particles of the same concentration is much lower than that of white smoke particles. As a result, the response of traditional photoelectric smoke detectors to the same concentration of black smoke and white smoke will be very different. Furthermore, after the light is scattered by the smoke particles, the light intensity of the scattered light at different angles is different. Therefore, there is a technical loophole in using a single fire detection principle with the detected smoke concentration as the alarm threshold. There may be a problem that the detector alarm cannot be triggered even when the black smoke concentration is very high.

SUMMARY OF THE INVENTION

The invention provides a multi-light source optical darkroom, which can detect a wider spectrum by setting a multi-light source sensor, and thus can identify particles with more particle diameters.

The technical scheme of the present invention is realized as follows:

A multi-light source optical darkroom is characterized in that it includes a dust-proof and insect-proof net, an optical darkroom, a circuit board and an optical signal sensor, the optical signal sensor is mounted on the circuit board, and the optical signal sensor includes a backward optical signal emitting device, A first forward optical signal transmitting device, an optical signal receiving device and a second forward optical signal transmitting device, 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 One end of the optical signal emitting device is installed on the circuit board, and the other end is installed on the rearward optical signal emitting device fixing cylinder, the first forward optical signal emitting device fixing cylinder, the optical signal receiving device fixing cylinder and the second forward direction respectively. In the fixed cylinder of the optical signal emitting device,

Wherein, the rearward optical signal emitting device fixing cylinder, the first forward optical signal emitting device fixing cylinder, the optical signal receiving device fixing cylinder and the second forward optical signal emitting device fixing cylinder are all cylindrical. It is a variable diameter cylinder, and the axis lines of the light exit holes of the rearward optical signal emitting device fixing cylinder, the first forward optical signal emitting device fixing cylinder and the second forward optical signal emitting device fixing cylinder are related to the optical signal receiving cylinder. The axis lines of the light inlet holes of the device fixing barrel intersect at one point, and the intersection point is on the axis line of the 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, an acute angle of 60°-80° is formed between the rearward optical signal emitting device fixing cylinder and the optical signal receiving device fixing cylinder, and the first forward optical signal emitting device is fixed The angle between the barrel and the second forward optical signal emitting device fixing barrel and the optical signal receiving device fixing barrel is an obtuse angle of 120°-130°.

In the multi-light source optical darkroom of the present invention, the optical darkroom includes a bottom mounting plate, and a guide shading grating is uniformly arrayed around the inner side of the bottom mounting board, and the guide shading grating is based on the optical signal sensor. A center-axis rotating array is distributed around the optical signal sensor.

In the multi-light source optical darkroom of the present invention, the diversion louver is composed of a curved louver and a straight louver, the height of the curved louver is lower than the height of the straight louver, and the curved louver is The height of plus the height of the fence is equal to the height of the dust and insect net.

In the multi-light source optical darkroom of the present invention, both ends of the curved louver and the straight louver are provided with tip portions.

In the multi-light source optical darkroom of the present invention, the guide shutter is provided with a light-shielding channel, and the light-shielding channel is formed by the cooperation of a first shutter and a second shutter. The grating adopts the design of wide bottom and narrow top.

In the multi-light source optical darkroom of the present invention, the first louver includes a first curved louver and a first straight louver, and the second louver includes a second curved louver and a second straight louver .

In the multi-light source optical darkroom of the present invention, the first straight louver is composed of a first outer straight louver and a first inner straight louver, and the second straight louver is composed of a second outer straight louver It is composed of a second inner straight shading grating, and the angle between the first outer straight shading grating and the first inner straight shading grating is 120°-130°.

In the multi-light source optical darkroom of the present invention, the horizontal included angle between the first outer straight louver and the second outer straight louver is 8°-10°, and the first inner straight louver and the second inner louver are The horizontal included angle of the straight-faced louver is 8°-10°.

In the multi-light source optical darkroom of the present invention, the width of one end of the first inner straight shading grating and the second inner straight shading grating close to the optical signal sensor is 2mm-3mm, The width of one end of the two inner straight-face shading gratings away from the optical signal sensor is 2mm-4mm.

In the multi-light source optical darkroom of the present invention, the first curved louvers and the second curved louvers are respectively connected with the first straight plane louvers and the second straight plane louvers, and the first curved louvers The width of the inlet channel and the second curved louver is 2mm-3mm, and the width of the outlet channel is 2mm-4mm.

In the multi-light source optical darkroom of the present invention, the dust-proof and insect-proof net is composed of transverse grid bars and vertical grid bars, and a plurality of smoke inlet mesh holes are formed between the transverse grid bars and the vertical grid bars. The side length of the smoke mesh is less than 1mm.

In the multi-light source optical darkroom of the present invention, the cross-sections of the transverse grid bars and the vertical grid bars are both isosceles trapezoids, and a plurality of vertical trapezoidal slots are formed between the plurality of vertical grid bars.

In the multi-light source optical darkroom of the present invention, a dust trap area is also designed on the bottom surface of the dust-proof and insect-proof net. The dust trap area is circular, and the dust trap is formed by arranging and combining a plurality of conical protrusions.

In the multi-light source optical darkroom of the present invention, a surrounding wall is also provided around the inner bottom surface of the dust-proof and insect-proof net.

In the multi-light source optical darkroom of the present invention, the inner surface of the enclosure wall is designed with zigzag convexes and concaves with an included angle of 60°.

In the multi-light source optical darkroom of the present invention, a partitioned facade is provided on the outer side of the enclosure wall, and the partitioned facade includes 8 flow guide grids, and the flow guide grid divides the partitioned facade into 8 regions , and the partition elevation is an arc surface.

In the multi-light source optical darkroom of the present invention, the guide grid includes a trapezoidal end portion, and the cross-sectional size of the trapezoidal end portion is the same as that of the vertical trapezoidal notch.

In the multi-light source optical darkroom of the present invention, the dust-proof and insect-proof net and the optical darkroom are respectively provided with male buckles and female buckles, and the dust-proof and insect-proof net is installed on the optical darkroom through a buckle structure.

Implementing the multi-light source optical darkroom of the present invention has the following beneficial effects:

(1) Multiple light sources can detect a wider spectrum, and then can identify particles with more particle sizes, and then determine whether the particles are generated by combustion or pyrolysis or suspended in the air, such as dust, water vapor, or food oil during cooking The generated oil fume can effectively reduce the false alarm rate of the sensor.

(2) The position of the fixed cylinder of the optical signal transmitting and receiving device is designed so that the intersection of the four axes intersect with the same point, and it is on the central axis of the darkroom. Smoke particles from any direction can diffuse to the detection area at the same speed. This ensures the consistency of the azimuth sensitivity of the optical darkroom to the smoke.

(3) The design of the dust-proof and insect-proof net can effectively prevent the entry of large particles of dust and insects. The traps set for the entering dust prevent the dust from affecting the sensitivity of the sensor, and the convergence of the airflow increases the sensitivity of the sensor to the smoke response. sex.

Description of drawings

Fig. 1 is the structural schematic diagram of this multi-light source optical darkroom of the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of Fig. 1;

FIG. 3 is a schematic structural diagram of the optical sensor and the optical darkroom in FIG. 1, omitting the circuit board;

FIG. 4 is a schematic diagram of the structure in one direction of FIG. 3 , mainly showing the structure of the guide shutter;

FIG. 5 is a schematic view of the structure in another direction of FIG. 4, showing the air intake direction;

FIG. 6 is a schematic structural diagram of the first guide shading grating and the second guide shading grating in FIG. 5;

Fig. 7 is the dust-proof and insect-proof net structure schematic diagram in Fig. 1;

Fig. 8 is a schematic diagram of a direction of Fig. 7;

Fig. 9 is another direction schematic diagram of Fig. 7;

Fig. 10 is the enlarged schematic diagram of A part of Fig. 9;

11 is a cross-sectional view taken along the line A-A of FIG. 8;

FIG. 12 is a cross-sectional view taken along the line B-B in FIG. 8 .

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely 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 Fig. 12 includes a dust and insect proof net 10, an optical darkroom 20, a circuit board 30 and a light signal sensor. The light signal sensor is installed on the circuit board 30, and the light signal The sensor includes 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 end 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 respectively mounted on the backward light. The signal emitting device fixing cylinder 45 , the first forward optical signal emitting device fixing cylinder 46 , the optical signal receiving device fixing cylinder 47 and the second forward optical signal emitting device fixing cylinder 48 are inside.

The rearward optical signal emitting device fixing cylinder 45, the first forward optical signal emitting device fixing cylinder 46, the optical signal receiving device fixing cylinder 47 and the second forward optical signal emitting device fixing cylinder 48 are all cylindrical. The cylindrical cylinder is a variable diameter cylinder, and the diameter of the light exit hole of the variable diameter cylinder is between 3mm and 4mm. The axis line of the light exit hole of the signal emitting device fixing cylinder 47 and the axis line of the light entrance hole of the light signal receiving device fixing cylinder 48 intersect at one point, and the intersection point is on the axis line of the optical darkroom 20 and away from the bottom surface of the optical darkroom 20 . In this way, the detection area of the three optical signal sensors can be the same area, so that the smoke particles from any direction can spread to the detection area at the same speed. This further ensures the consistency of the azimuth sensitivity of the optical darkroom 20 to the smoke.

Preferably, there is an acute angle of 80° between the rearward optical signal emitting device fixing tube 45 and the optical signal receiving device fixing tube 47, using the principle of backward reflected light, the first forward optical signal emitting device fixing tube 46 and the second The angle between the forward optical signal emitting device fixing cylinder 48 and the optical signal receiving device fixing cylinder 47 is an obtuse angle of 126°, which belongs to the principle of forward refracted light.

The optical darkroom 20 includes a bottom mounting plate 21. The inner side of the bottom mounting plate 21 is provided with a diversion shading grating 22, and a rotating array of the diversion shading grating 22 is distributed around the optical signal sensor with the center of the optical signal sensor as the axis.

The guide shutter 22 is composed of a curved shutter 221 and a straight shutter 222. The height of the curved shutter 221 is lower than the height of the straight shutter 222. The height of the curved shutter 221 plus the height of the enclosure wall 50 is equal to the dust and insect proof net 10. After the dust-proof and insect-proof net 10 is installed in the optical darkroom 20, the surrounding wall 50 and the curved shading grating 221 are used to gather the outside air flow and block the outside light, and the straight-face shading grating 222 is stuck on the inner wall of the surrounding wall 50 to avoid the surrounding wall 50. Looseness makes the installation structure firm and stable.

Both ends of the curved shading grating 221 and the straight shading grating 222 are provided with tip portions 224. The tip portions 224 can reduce the obstruction to the airflow, so that the smoke particles can quickly enter the labyrinth and improve the sensitivity of the optical signal sensor.

The guide shading grating 22 is provided with a light shading channel, and the light shading channel is formed by the cooperation of the first shading grating 23 and the second shading grating 24 , both of which are designed with a wide bottom and a narrow top. In the process of smoke in or out, the shutter reduces the obstruction to the air flow, making it easier for the air to float in or out, so that the light signal sensor can more easily detect the changes in the surrounding smoke, so that the light signal sensor responds more easily. Sensitive; at the same time, the easy flow of smoke makes the optical signal sensor reduce the false alarm caused by people smoking in the detection space.

The first shutter 23 includes a first curved shutter 231 and a first straight shutter 232 , the second shutter 24 includes a second curved shutter 241 and a second straight shutter 242 , wherein the first straight shutter 232 It consists of a first outer straight shading plate 233 and a first inner straight shading plate 234. The second straight shading plate 242 consists of a second outer straight shading plate 243 and a second inner straight shading plate 244. The first outer straight shading plate 233 and The angle of the first inner straight shading barrier 234 is 125°, wherein the horizontal angle between the first outer straight shading barrier 233 and the second outer straight shading barrier 243 is 10°, and the first inner straight shading barrier 234 and the second inner straight shading barrier 234 are The horizontal included angle of the shutter grating 244 is 10°. The width of one end of the first inner straight shading grating 234 and the second inner straight shading grating 244 close to the optical signal sensor is 3 mm, and the width of one end of the first inner straight shading grating 234 and the second inner straight shading grating 244 away from the optical signal sensor is 3 mm. is 4mm.

The first curved louvers 231 and the second curved louvers 241 are respectively connected with the first straight louvers 232 and the second straight louvers 242 , and the width of the entrance channel between the first curved louvers 231 and the second curved louvers 241 is 3mm, and the outlet channel width is 4mm. The shading channel adopts a "crescent shape" design with two narrow and middle wide sections, which can prevent most of the external light from entering the optical darkroom. Even if it can pass through the shading channel, most of the light is continuously reflected and scattered in the middle area of the shading channel and weakened. Effectively avoid the interference of external light on the optical darkroom. The above spacing density of the guide shading gratings 22 can not only ensure that the light emitted from the outside cannot enter the dark room, but also can reduce the number of the guide shading gratings 22 to a certain extent and reduce the manufacturing cost. The smoke and dust can enter the optical darkroom smoothly, which improves the detection sensitivity of the optical signal sensor.

The dust-proof and insect-proof net 10 is composed of horizontal grid bars 101 and vertical grid bars 102. A plurality of smoke inlet mesh holes 106 are formed between the horizontal grid bars 101 and the vertical grid bars 102, and the side length of the smoke inlet mesh holes 106 is smaller than 1mm, to ensure that smoke particles can enter while preventing 1mm of insects from entering. The cross-sections of the horizontal grid bars 101 and the vertical grid bars 102 are both isosceles trapezoids, which effectively reduce the obstruction to the entry or escape of smoke particles inside and outside, and prevent false alarms. A plurality of vertical trapezoidal notches 103 are formed between the plurality of vertical grid bars 102 .

The bottom surface of the dust-proof and insect-proof 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 protrusions 105 . After the dust entering the optical darkroom 20 settles naturally, the dust falls into the root of the conical protrusion 105, which is an area that cannot be irradiated by the emitted light, and belongs to a dust trap, so it will not be affected by the scattering of the emitted light by the dust. The received signal changes, this design improves the anti-dust pollution ability of the optical signal sensor.

There is also a wall 50 around the inner bottom surface of the dust-proof and insect-proof net 10, which is used to block dust particles from directly entering the interior of the darkroom, especially to prevent dust from entering the bottom surface of the darkroom, and to prevent the turbulent airflow from the outside from affecting the interior of the darkroom. Causes the dust to float at the root of the conical protrusion. The inner surface of the enclosure wall 50 is designed with sawtooth-shaped protrusions and depressions 51 with an included angle of 60°, so that the light emitted from the optical signal emitting device is reflected multiple times in the groove and absorbed.

The outer side of the enclosure wall 50 is provided with a partitioned facade 52, and the partitioned facade 52 includes 8 guide grids 53. The guide grids 53 divide the partitioned facade 52 into 8 areas, and the partitioned facade 52 is an arc surface, which further reduces the smoke in the smoke. The obstruction of the air inlet or outlet, which can condense the air flow, avoid the air flow from the outside of the wall, and increase the sensitivity of the light signal sensor to the smoke response.

The guide grille 53 includes a trapezoidal end portion 531. The cross-sectional size of the trapezoidal end portion 531 is the same as the cross-sectional size of the vertical trapezoidal slot 103. In the dust and insect net 10, the installation and disassembly are convenient.

Preferably, the dust-proof and insect-proof net 10 and the optical darkroom 20 are respectively provided with a male buckle 105 and a female buckle 201, and the dust-proof and insect-proof net 10 is installed on the optical darkroom through a buckle structure, which is convenient for disassembly and installation, especially convenient for regular anti-proofing. The dust in the dust and insect net 10 is cleaned to ensure the sensitivity of the optical signal sensor.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims

A multi-light source optical darkroom is characterized in that it comprises a dust-proof and insect-proof net, an optical darkroom, a circuit board and a light signal sensor, the light signal sensor is mounted on the circuit board, and the light signal sensor comprises a backward light signal emitting device, a first A forward optical signal transmitting device, an optical signal receiving device and a second forward optical signal transmitting device, the backward optical signal transmitting device, the first forward optical signal transmitting device, the optical signal receiving device and the second forward optical signal One end of the signal emitting device is installed on the circuit board, and the other end is installed on the rearward optical signal emitting device fixing tube, the first forward optical signal emitting device fixing tube, the optical signal receiving device fixing tube and the second forward light respectively. In the fixed cylinder of the signal emitting device,

Wherein, the rearward optical signal emitting device fixing cylinder, the first forward optical signal emitting device fixing cylinder, the optical signal receiving device fixing cylinder and the second forward optical signal emitting device fixing cylinder are all cylindrical. It is a variable diameter cylinder, and the axis lines of the light exit holes of the rearward optical signal emitting device fixing cylinder, the first forward optical signal emitting device fixing cylinder and the second forward optical signal emitting device fixing cylinder are related to the optical signal receiving cylinder. The axis lines of the light inlet holes of the device fixing cylinder intersect at one point, and the intersection point is on the axis line of the optical darkroom, and is far from the bottom surface of the optical darkroom.
The multi-light source optical darkroom according to claim 1, wherein the optical darkroom comprises a bottom mounting plate, and the inner side of the bottom mounting plate is uniformly arrayed with diversion shading gratings. The center of the optical signal sensor is an axis rotating array distributed around the optical signal sensor.
The multi-light source optical darkroom according to claim 2, wherein the guide shading grating is composed of a curved louver and a straight louver, and the height of the curved louver is lower than that of the straight louver.
The multi-light source optical darkroom according to claim 3, wherein both ends of the curved shading grating and the straight shading grating are provided with tip portions.
The multi-light source optical darkroom according to claim 2, wherein the guide shutter is provided with a light-shielding channel, and the light-shielding channel is formed by the cooperation of a first shutter and a second shutter, and the first shutter is provided with a light-shielding channel. And the second louver adopts the design of wide bottom and narrow top.
The multi-light source optical darkroom according to claim 1, wherein the dust-proof and insect-proof net is composed of transverse grid bars and vertical grid bars, and a plurality of smoke inlet mesh holes are formed between the transverse grid bars and the vertical grid bars. , the side length dimension of the smoke inlet mesh is less than 1mm.
The multi-light source optical darkroom according to any one of claims 1 to 6, wherein the bottom surface of the dust-proof and insect-proof net is further designed with a dust trap area, the dust trap area is circular, and the dust trap consists of a plurality of cones. The convex parts are arranged and combined.
The multi-light source optical darkroom according to claim 7, wherein a surrounding wall is further provided around the inner bottom surface of the dust-proof and insect-proof net.
The multi-light source optical darkroom according to claim 8, wherein the inner surface of the enclosure wall is designed with zigzag convexes and concaves with an included angle of 60°.
The multi-light source optical darkroom according to claim 8, wherein a partitioned facade is provided on the outer side of the enclosure wall, and the partitioned facade comprises 8 flow guide grids, and the flow guide grids connect the partitioned facades. There are 8 areas, and the partition facade is an arc surface.