CN220367213U - Light curtain type oil smoke detection sensor - Google Patents
Light curtain type oil smoke detection sensor Download PDFInfo
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- CN220367213U CN220367213U CN202321234553.4U CN202321234553U CN220367213U CN 220367213 U CN220367213 U CN 220367213U CN 202321234553 U CN202321234553 U CN 202321234553U CN 220367213 U CN220367213 U CN 220367213U
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- light
- lens
- diverging
- oil smoke
- detection sensor
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- 239000000779 smoke Substances 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 239000006233 lamp black Substances 0.000 claims abstract description 28
- 239000006096 absorbing agent Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 description 18
- 238000010411 cooking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Abstract
The utility model discloses a light curtain type lampblack detection sensor, which comprises a shell arranged corresponding to an air inlet of a lampblack absorber, wherein an infrared emission device and an infrared receiving device are arranged in the shell, a divergent lens is arranged at the emission end of the infrared emission device to diverge emitted light into a light curtain covering a lampblack area, and a condensing lens is arranged at the receiving end of the infrared receiving device to converge the light reflected by lampblack; the utility model can disperse and diffuse the punctiform or linear detection light into the light curtain covering the whole oil smoke area, thereby more accurately detecting the oil smoke generation and the oil smoke concentration.
Description
Technical Field
The utility model belongs to the technical field of lampblack detection, and relates to a light curtain type lampblack detection sensor.
Background
At present, a photoelectric type lampblack sensor is configured for part of lampblack absorbers in the market, and the infrared scattering principle is adopted to detect the change trend of the concentration of lampblack particles in an air duct of the lampblack absorber. Because the photoelectric type oil smoke sensor has the advantages of high response speed, high detection precision and the like, the assembly of the photoelectric type oil smoke sensor on the range hood gradually becomes an industry trend.
However, the conventional photoelectric type oil smoke sensor has the following defects:
1. the traditional photoelectric type oil smoke sensor is easily affected by ambient light and needs to be installed in an air duct of the range hood, and the installation mode enables a sensor detection window to be easily polluted by oil smoke, and meanwhile, manual cleaning is inconvenient for a user after the sensor is used.
2. The range of a detection area emitted by the traditional photoelectric type oil smoke sensor is narrow and limited, namely the traditional photoelectric type oil smoke sensor can only detect the oil smoke concentration passing through a certain point and a certain line area of the sensor. In a real cooking scene, however, the cooking fumes are not only distributed at some points and line areas, but are distributed in a three-dimensional space. Therefore, the traditional photoelectric type oil smoke sensor cannot accurately reflect the oil smoke concentration in the actual detection process. For example, in the CN110030595a patent, the detection light cannot cover the whole air duct, and most of the oil smoke directly enters the air duct without passing through the detection light, so that the detection result is not accurate enough.
Therefore, the utility model discloses a light curtain type lampblack detection sensor aiming at the defects of the traditional photoelectric lampblack sensor.
Disclosure of Invention
The utility model aims to provide a light curtain type oil smoke detection sensor which can disperse detection light into a light curtain covering the whole oil smoke area, and further can detect the oil smoke concentration more accurately.
The utility model is realized by the following technical scheme:
the utility model provides a light curtain formula oil smoke detects sensor, includes the casing that corresponds lampblack absorber air intake and sets up, the inside of casing is provided with infrared emission device and infrared receiving arrangement, its characterized in that, infrared emission device's transmitting end is provided with diverges the lens in order to diverge the light curtain that will emit light for covering the oil smoke region, infrared receiving arrangement's receiving end is provided with condensing lens in order to assemble the light that the oil smoke was reflected.
The infrared emission device emits detection light towards an oil smoke area formed between an air inlet of the range hood and a cooking bench of the gas stove, and the detection light diverges through the divergent lens to form a light curtain covering the oil smoke area. When the oil smoke enters the oil smoke area, the light curtain is reflected and refracted under the action of oil smoke particles, reflected light and refracted light are converged into linear light through the condensing lens and then enter the infrared receiving device, the infrared receiving device further converts light signals into electric signals and sends the electric signals to a controller arranged in the range hood, the controller receives the electric signals to indicate that the oil smoke is generated, and at the moment, the controller can control the range hood to be automatically opened. Meanwhile, according to the quantity of the reflected light signals, electric signals with different strengths are generated, and the controller adjusts the power of the range hood according to the electric signals with different strengths.
In order to better implement the utility model, the diverging lens further comprises at least one diverging lens unit arranged along the optical path, the diverging lens unit comprising at least one diverging surface for diverging the light rays.
In order to better implement the present utility model, further, the divergent lens is a cylindrical lens, and the curvature of the divergent lens unit in the horizontal direction is different from that in the vertical direction.
In order to better implement the utility model, the diverging lens unit further comprises one diverging lens, the entrance end of which is provided with a first diverging surface and the exit end of which is provided with a second diverging surface.
In order to better realize the utility model, the divergent lens unit further comprises a first divergent lens, a second divergent lens and a third divergent lens which are arranged along the light path, wherein the incident ends of the first divergent lens, the second divergent lens and the third divergent lens are provided with first divergent surfaces which are straight or convex along the light path, and the emergent ends of the first divergent lens, the second divergent lens and the third divergent lens are provided with second divergent surfaces which are straight or convex along the light path.
In order to better implement the present utility model, the condensing lens further includes at least one condensing lens unit disposed along the optical path, and the condensing lens unit includes at least one condensing surface condensing the light.
In order to better implement the present utility model, further, the condensing lens unit includes at least one condensing lens, and one side of the condensing lens is provided with at least one collimating lens.
In order to better realize the utility model, the included angle between the transmitting beam axis of the infrared transmitting device and the receiving beam axis of the infrared receiving device is 1-45 degrees.
In order to better realize the utility model, a light filtering device is arranged between the condensing lens and the oil smoke area.
In order to better realize the utility model, the optical filter device further comprises an optical filter and a light blocking sheet, wherein the optical filter is arranged at the incident end of the condensing lens, and the light blocking sheet is arranged at the bottom of the optical filter corresponding to the smoke area.
Compared with the prior art, the utility model has the following advantages:
(1) According to the utility model, the emission end of the infrared emission device is provided with the divergent lens, the detection light is diverged into the detection light curtain capable of covering the whole oil smoke area through the divergent lens, and the oil smoke in the whole oil smoke area is detected through the detection light curtain, so that the concentration of the oil smoke can be detected more accurately according to the situation that the oil smoke is distributed in space in the actual use environment;
(2) According to the utility model, the infrared receiving device is arranged, the condensing lens is arranged at the receiving end of the infrared receiving device, and the light scattered by the oil smoke is converged to the infrared receiving device through the condensing lens, so that the light energy loss is avoided, and the concentration of the oil smoke can be more accurately detected;
(3) According to the utility model, the light filtering device is arranged at the receiving end of the infrared receiving device, and the light exceeding the oil smoke area is shielded and filtered through the light filtering device, so that false alarm of oil smoke detection caused by the fact that a human body approaches the range hood when no oil smoke is generated is avoided;
(4) The whole oil smoke sensor is arranged outside the range hood instead of inside the air duct of the range hood, so that the cleaning and replacement of the oil smoke sensor are more convenient and quick, and time and labor are saved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic diagram of the divergent lens and the convergent lens;
FIG. 3 is a schematic diagram of the angle between the transmit beam axis and the receive beam axis;
FIG. 4 is a schematic view of a light curtain;
FIG. 5 is a schematic view of the optical path of a diverging lens in the Y direction;
FIG. 6 is a schematic view of the optical path of a diverging lens in the X direction;
FIG. 7 is a schematic view of a single diverging lens;
FIG. 8 is a schematic view of the optical path of a single diverging lens in the X direction;
fig. 9 is a schematic view of the optical path of a single diverging lens in the Y direction.
Wherein: 1-an infrared emission device; 2-an infrared receiving device; 3-diverging lenses; 4-a condensing lens; 5-a light filtering device; 31-a first diverging lens; 32-a second diverging lens; 33-a third diverging lens; 41-a condenser lens unit; 51-an optical filter; 52-light blocking sheet.
Detailed Description
Example 1:
the light curtain type lampblack detecting sensor of the embodiment, as shown in fig. 1 and 2, comprises a shell corresponding to the setting of an air inlet of a lampblack absorber, an infrared transmitting device 1 and an infrared receiving device 2 are arranged in the shell, a diverging lens 3 is arranged at the transmitting end of the infrared transmitting device 1 to diverge emitted light into a light curtain covering a lampblack area, and a condensing lens 4 is arranged at the receiving end of the infrared receiving device 2 to converge the reflected light of lampblack.
The light emitted by the infrared emission device 1 is shaped by the divergent lens 3 to form a fan-shaped light curtain, and the light transmitted through the divergent lens 3 is shown in fig. 7. The diverging lens 3 comprises at least one diverging surface for diverging the light rays, the diverging surface being designed with different curvatures in the X-direction (horizontal direction) and the Y-direction (vertical direction). The X-direction ensured light emitting angle is shown in fig. 8, the Y-direction ensured light collimation is shown in fig. 9, and the area covered by the light is the area capable of detecting oil smoke.
Once the lampblack rises to enter the lampblack area, the detection light curtain scatters under the action of lampblack particles, scattered light is converged by the condensing lens 4 and enters the infrared receiving device 2, the received light signal is converted into an electric signal through the infrared receiving device 2 and is sent to a controller in the lampblack absorber, and the automatic start and stop and the working power of the lampblack absorber are controlled through the controller.
Because the detection area of light curtain is far greater than the detection area of traditional lampblack absorber, therefore when the oil smoke passes through the light curtain, scattered light is more, not only can whether have the oil smoke to get into detection area more accurate detection, the concentration of oil smoke of detection that also can be more accurate simultaneously, generate the electric signal of different intensity through infrared receiving arrangement 2, and then control the start-stop of lampblack absorber and the working power of lampblack absorber according to the electric signal of different intensity through the inside controller of lampblack absorber.
Further, the infrared emitting device 1 is an infrared light source, and the wavelength thereof is about 920nm. The infrared light source comprises a laser diode or a light emitting diode. The infrared receiving device 2 comprises a photosensitive element and an amplifying circuit connected with the photosensitive element, and the output end of the amplifying circuit is connected with a controller in the range hood.
Example 2:
this embodiment is further optimized on the basis of the above embodiment 1, and as shown in fig. 4, the diverging lens 3 includes at least one diverging lens unit disposed along the optical path, and the diverging lens unit includes at least one diverging surface for diverging the light.
Further, the divergent lens 3 includes 1 to 5 divergent lens units arranged in order along the optical path.
Other portions of this embodiment are the same as those of embodiment 1, and thus will not be described in detail.
Example 3:
the present embodiment is further optimized on the basis of the above embodiment 2, as shown in fig. 5 and 6, the diverging lens unit includes a first diverging lens 31, a second diverging lens 32, and a third diverging lens 33 disposed along the optical path, the incident ends of the first diverging lens 31, the second diverging lens 32, and the third diverging lens 33 are provided with a first diverging surface that is flat or convex along the optical path, and the emergent ends of the first diverging lens 31, the second diverging lens 32, and the third diverging lens 33 are provided with a second diverging surface that is flat or convex along the optical path.
Further, the first diverging lens 31, the second diverging lens 32 and the third diverging lens 33 are made of PMMA or PLOYCARB materials, and the focal length of the first diverging lens 31, the second diverging lens 32 and the third diverging lens 33 after being arranged and combined is 7mm-10mm; WFNO of the first, second and third diverging lenses 31, 32, 33: 1.0; ENPD 8.4.
Other portions of this embodiment are the same as those of embodiment 2, and thus will not be described in detail.
Example 4:
this embodiment is further optimized based on embodiment 2 above, as shown in fig. 7, where the diverging lens unit includes a diverging lens, an incident end of the diverging lens is provided with a first diverging surface, and an exit end of the diverging lens is provided with a second diverging surface. As shown in fig. 8 and 9, the curvature of the diverging lens in the X direction is different from the curvature of the diverging lens in the Y direction, the diverging lens being used to diverge light in the X direction, the diverging lens being used to collimate light in the Y direction.
Other portions of this embodiment are the same as those of embodiment 2, and thus will not be described in detail.
Example 5:
this embodiment is further optimized on the basis of any one of the above embodiments 1 to 4, and as shown in fig. 2, the condensing lens 4 includes at least one condensing lens unit 41 disposed along the optical path, and the condensing lens unit 41 includes at least one condensing surface for condensing light.
Further, the condenser lens 4 includes 1 to 5 condenser lens units 41 disposed along the optical path.
The focal length of the condensing lens 4 is preferably 7.5mm-10mm, and the condensing lens is made of PMMA or PC.
Other portions of this embodiment are the same as any of embodiments 1 to 4 described above, and thus will not be described again.
Example 6:
this embodiment is further optimized on the basis of any one of the above embodiments 1 to 5, and as shown in fig. 3, the angle α between the emission beam axis of the infrared emission device 1 and the receiving beam axis of the infrared receiving device 2 is 1 to 45 °.
Other portions of this embodiment are the same as any of embodiments 1 to 5 described above, and thus will not be described again.
Example 7:
the present embodiment is further optimized based on any one of the foregoing embodiments 1 to 6, as shown in fig. 3, a filtering device 5 is disposed between the condensing lens 4 and the oil smoke area, and the light reflected and refracted to the condensing lens 4 is filtered by the filtering device 5, so that only the light reflected and refracted by the oil smoke area is allowed to enter the condensing lens 4.
Further, the light filtering device 5 includes a light filtering plate 51 and a light blocking plate 52, the incident end of the condensing lens 4 is provided with the light filtering plate 51, and the bottom of the light filtering plate 51 is provided with the light blocking plate 52 corresponding to the smoke area. Through setting up light filter 51 for only the light signal can get into condensing lens 4 through light filter 51, set up light blocking piece 52 through the bottom of sub-o light filter 51 in the position that corresponds the smog region simultaneously, restrict the light that condensing lens 4 received only to come from the oil smoke region through light blocking piece 52, avoid exceeding the light in oil smoke region and get into condensing lens 4 and influence detection precision.
Other portions of this embodiment are the same as any of embodiments 1 to 6 described above, and thus will not be described again.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.
Claims (9)
1. The utility model provides a light curtain formula oil smoke detects sensor, includes the casing that corresponds lampblack absorber air intake and sets up, the inside of casing is provided with infrared emission device (1) and infrared receiving arrangement (2), its characterized in that, the transmitting end of infrared emission device (1) is provided with diverges lens (3) in order to diverge the light curtain that the emission light was covered the oil smoke region, the receiving end of infrared receiving arrangement (2) is provided with condensing lens (4) in order to assemble the light of oil smoke scattering.
2. A light curtain type smoke detection sensor according to claim 1, characterized in that the diverging lens (3) comprises at least one diverging lens unit arranged along the light path, said diverging lens unit comprising at least one diverging surface for diverging light rays.
3. A light curtain type smoke detection sensor as defined in claim 2, wherein the curvature of said divergent lens unit in the horizontal direction is different from that in the vertical direction.
4. A light curtain type smoke detection sensor as defined in claim 3, wherein said divergent lens unit comprises a divergent lens, an incident end of said divergent lens is provided with a first divergent surface, and an exit end of said divergent lens is provided with a second divergent surface.
5. A light curtain type smoke detection sensor as claimed in claim 3, characterized in that the diverging lens unit comprises a first diverging lens (31), a second diverging lens (32) and a third diverging lens (33) arranged along the light path, the incident ends of the first diverging lens (31), the second diverging lens (32) and the third diverging lens (33) are provided with first diverging surfaces which are flat or convex along the light path, and the emergent ends of the first diverging lens (31), the second diverging lens (32) and the third diverging lens (33) are provided with second diverging surfaces which are flat or convex along the light path.
6. A light curtain type smoke detection sensor according to claim 1, characterized in that the condenser lens (4) comprises at least one condenser lens unit (41) arranged along the light path, the condenser lens unit (41) comprising at least one converging surface for converging light.
7. A light curtain type smoke detection sensor as claimed in any one of claims 1-6, characterized in that the angle between the emission beam axis of the infrared emission means (1) and the reception beam axis of the infrared reception means (2) is 1-45 °.
8. A light curtain type smoke detection sensor according to any one of claims 1-6, characterized in that a filter device (5) is arranged between the condenser lens (4) and the smoke area.
9. The light curtain type lampblack detection sensor according to claim 8, characterized in that the light filtering device (5) comprises a light filter (51) and a light blocking sheet (52), the light filter (51) is arranged at the incident end of the condensing lens (4), and the light blocking sheet (52) is arranged at the bottom of the light filter (51) corresponding to the smoke area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321234553.4U CN220367213U (en) | 2023-05-22 | 2023-05-22 | Light curtain type oil smoke detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321234553.4U CN220367213U (en) | 2023-05-22 | 2023-05-22 | Light curtain type oil smoke detection sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220367213U true CN220367213U (en) | 2024-01-19 |
Family
ID=89518097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321234553.4U Active CN220367213U (en) | 2023-05-22 | 2023-05-22 | Light curtain type oil smoke detection sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220367213U (en) |
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2023
- 2023-05-22 CN CN202321234553.4U patent/CN220367213U/en active Active
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