CN107036949B - Dust concentration detection device and air purification equipment with same - Google Patents
Dust concentration detection device and air purification equipment with same Download PDFInfo
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- CN107036949B CN107036949B CN201710358819.9A CN201710358819A CN107036949B CN 107036949 B CN107036949 B CN 107036949B CN 201710358819 A CN201710358819 A CN 201710358819A CN 107036949 B CN107036949 B CN 107036949B
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- laser
- dust
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- air
- assembly
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- 239000000428 dust Substances 0.000 title claims abstract description 101
- 238000001514 detection method Methods 0.000 title claims abstract description 88
- 238000004887 air purification Methods 0.000 title claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 43
- 230000008033 biological extinction Effects 0.000 claims description 25
- 238000001914 filtration Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims 1
- 231100000719 pollutant Toxicity 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
- G01N15/0625—Optical scan of the deposits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
Abstract
The invention provides a dust concentration detection device and air purification equipment, which belong to the field of air quality detection, wherein a circuit board assembly of the dust concentration detection device is arranged outside a first air circulation channel, the detected air flow flowing through the circuit board is filtered, and a laser emission assembly and a laser detection assembly on the circuit board assembly are contacted with the detected air flow through holes arranged on the outer wall of the first air circulation channel; the technical problems that the accuracy of a dust detection result is affected and the service life of the dust detection device is shortened due to the fact that electronic components in the circuit board assembly are easily covered by dust when the circuit board assembly in the dust concentration detection device is exposed to the detected airflow for a long time are solved; the technical effects of ensuring that the air flow flowing through the circuit board assembly is the filtered fresh air flow, reducing the dust coverage of electronic components, improving the accuracy of dust detection results and prolonging the service life of the dust detection device are achieved.
Description
Technical Field
The invention belongs to the field of air quality detection, and particularly relates to a dust concentration detection device and air purification equipment.
Background
The laser dust concentration detection device is a device for counting suspended particles in air or measuring the mass concentration by utilizing an MIE scattering theory. The dust concentration detection device generally includes a fluid flow channel through which a gas flow flows, a laser emitting assembly for generating laser light, and a laser detecting assembly for sensing scattered light. The airflow to be measured flows in the fluid circulation channel, dust in the airflow to be measured flows above the laser detection assembly and is irradiated by laser to generate scattered light, the laser detection assembly receives the scattered light, and the concentration detection condition of the dust in the airflow to be measured is obtained through analysis of the scattered light.
The circuit board assembly in the dust concentration detection device in the prior art generally comprises a laser emitting assembly, a laser detection assembly and other circuits, and people usually fully expose the whole circuit board assembly comprising the laser emitting assembly, the laser detection assembly and the other circuits to the detected airflow.
Because the circuit board assembly in the dust concentration detection device is exposed to the detected air flow for a long time, electronic components in the circuit board assembly are easily covered by dust, so that the heat dissipation of the electronic components is influenced, and the accuracy of a dust detection result and the service life of the dust detection device are further influenced.
Disclosure of Invention
The invention provides a dust concentration detection device and air purification equipment, aiming at solving the technical problems that the accuracy of a dust detection result and the service life of the dust detection device are affected by the fact that electronic components in a detection unit are easily polluted by detected air flow when a circuit board assembly in the dust concentration detection device is exposed to the detected air flow for a long time. The technical proposal is as follows:
according to a first aspect of an embodiment of the present invention, there is provided a dust concentration detection apparatus including:
The shell is provided with a first opening and a first air inlet, a first fluid circulation channel communicated with the first air inlet is arranged in the shell, and a first eyelet and a second eyelet are arranged on the side wall of the first fluid circulation channel;
A circuit board assembly mounted in the housing, the circuit board assembly including a laser emitting assembly aligned with the first aperture for emitting laser light through the first aperture into the first fluid flow channel and a laser detection assembly aligned with the second aperture for receiving light scattered from the first fluid flow channel; and a filter element installed at the first opening for filtering contaminants in the air flow to be tested and protecting the circuit board assembly.
As an optional implementation manner, the air extractor further comprises an air extractor, the shell is provided with an air outlet, the air extractor is provided with an air inlet surface and an air outlet surface, the air inlet surface is communicated with the first fluid circulation channel, and the air outlet surface is communicated with the air outlet.
As an alternative embodiment, the first and second holes are provided in adjacent two side walls of the first fluid flow channel.
As an alternative embodiment, a light leakage hole is formed in a side wall opposite to the side wall where the first hole is formed, the light leakage hole is aligned with the first hole, and a extinction area disposed outside the first fluid flow channel is aligned with the light leakage hole, and the extinction area receives the laser emitted by the laser emitting component and passing through the first fluid flow channel.
As an alternative implementation manner, the extinction area is provided with a light inlet surface perpendicular to the laser emitting path of the laser emitting assembly, a reflecting surface intersected with the laser path and an extinction surface parallel to the laser path, the three surfaces form an isosceles right triangle, and the extinction surface is provided with at least one protrusion for counteracting the light entering the extinction area.
As an alternative embodiment, the path of the laser emitted by the laser emitting assembly intersects the flow direction of the gas flow to be measured in the first fluid flow channel.
As an alternative embodiment, the filter element is detachably mounted on the first opening.
As an alternative embodiment, the filter element comprises a frame and a screen mounted in the frame, the frame being secured to the edge of the first opening.
As an alternative implementation manner, two opposite sides of the frame body are respectively provided with a buckle, and the shell is provided with a clamping groove corresponding to the buckle.
As an alternative embodiment, the filter screen is in the form of a grid.
The technical scheme provided by the embodiment of the invention comprises the following beneficial technical effects:
The dust concentration detection device is characterized in that a circuit board assembly of the dust concentration detection device is arranged on the outer side of a first air circulation channel, detected air flow flowing through the circuit board is filtered, and a laser emission assembly and a laser detection assembly on the circuit board assembly are in contact with the detected air flow through holes arranged on the outer wall of the first air circulation channel; the technical problems that the accuracy of a dust detection result is affected and the service life of the dust detection device is shortened due to the fact that electronic components in the circuit board assembly are easily covered by dust when the circuit board assembly in the dust concentration detection device is exposed to the detected airflow for a long time are solved; the technical effects of ensuring that the air flow flowing through the circuit board assembly is the filtered fresh air flow, reducing the dust coverage of electronic components, improving the accuracy of dust detection results and prolonging the service life of the dust detection device are achieved.
According to a second aspect of the embodiment of the present invention, there is provided an air cleaning apparatus including any one of the dust concentration detecting devices as set forth in the first aspect of the embodiment of the present invention and alternative embodiments thereof.
The technical scheme provided by the embodiment of the invention comprises the following beneficial technical effects:
The air purification equipment comprises a dust concentration detection device, wherein a circuit board assembly of the dust concentration detection device is arranged outside a first air circulation channel, the detected air flow flowing through the circuit board is filtered, and a laser emission assembly and a laser detection assembly on the circuit board assembly are contacted with the detected air flow through holes arranged on the outer wall of the first air circulation channel; the technical problems that the accuracy of a dust detection result is affected and the service life of the dust detection device is shortened due to the fact that electronic components in the circuit board assembly are easily covered by dust when the circuit board assembly in the dust concentration detection device is exposed to the detected airflow for a long time are solved; the technical effects of ensuring that the air flow flowing through the circuit board assembly is the filtered fresh air flow, reducing the dust coverage of electronic components, improving the accuracy of dust detection results and prolonging the service life of the dust detection device are achieved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Fig. 1 is a plan view of a housing of a dust detection device according to an embodiment of the present invention.
Fig. 2 is an exploded perspective view of a dust detection device according to an embodiment of the present invention.
Fig. 3 is a partial assembly view of a dust detection device according to an embodiment of the present invention.
Fig. 4 is an assembly schematic diagram of a housing and a circuit board assembly of the dust detection device according to an embodiment of the present invention.
Fig. 5 is a top view and a light incident schematic diagram of a extinction area of a dust detection device according to an embodiment of the invention.
Fig. 6 is a top view of a housing of a dust detection device according to another embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below by examples and with reference to the accompanying drawings.
First opening 103 of first fluid flow path 102 of housing 10
First air inlet 101 and air outlet 104 of circuit board assembly 11
First aperture 106 of laser emitting assembly 105 and laser detecting assembly 107
First air flow channel rear wall 102a first air flow channel upper wall 102b
First air flow channel front wall 102c second aperture 108 filter element 109
Extinction area 112 of third hole 111 of first chamber 110 of air extractor 13
Light-entering face 112a extinction face 112b reflection face 112c light-leaking hole 113
Projection 114 is snapped into threaded hole 115 of slot 103b of clip 103a
Air inlet face 13a of air extractor and air outlet face 13b of air extractor
Embodiment one:
referring to fig. 1,3, 4, 5 and 6, a dust concentration detecting apparatus according to the present embodiment includes a housing 10, the housing 10 has a first opening 103 and a first air inlet 101, a first fluid flow channel 102 communicating with the first air inlet 101 is disposed in the housing 10, and a first hole 106 and a second hole 108 are disposed on a side wall of the first fluid flow channel 102.
The dust concentration detecting apparatus further comprises a circuit board assembly 11 mounted in the housing 10, the circuit board assembly 11 comprising a laser emitting assembly 105 and a laser detecting assembly 107, the laser emitting assembly 105 being aligned with the first aperture 106 to emit laser light into the first fluid flow channel 102 through the first aperture 106, the laser detecting assembly 107 being aligned with the second aperture 108 to receive light scattered from the first fluid flow channel 102. A filter element 109 is mounted at the first opening 103 for filtering contaminants from the air stream under test to shield the circuit board assembly 11.
The circuit board assembly 11 is located outside the first fluid flow channel 102, and the laser emitting assembly 105 of the circuit board assembly 11 emits laser to the inside of the first fluid flow channel 102 through the first hole 106, and the laser irradiates the air flow to be measured flowing in the first fluid flow channel 102 to generate scattered light, and the scattered light receives the light scattered from the first fluid flow channel 102 through the second hole 108 and converts the received light signal into an electrical signal. The dust detection function is achieved while the air flowing through the circuit board assembly 11 is filtered relatively clean air due to the arrangement of the filter element 109, avoiding dust coverage on the circuit board assembly 11.
Further, the dust concentration detecting device further includes an air extracting device 13, the housing 10 is provided with an air outlet 104, the air extracting device 13 is provided with an air inlet surface 13a and an air outlet surface 13b, the air inlet surface 13a is communicated with the first fluid flow channel 102, and the air outlet surface 13b is communicated with the air outlet 104.
The air extraction device 13 may be a fan or an air pump. The air extractor 13 is used to ensure that the air flow to be measured flows in a fixed direction.
Further, the first hole 106 and the second hole 108 are formed on two adjacent sidewalls of the first fluid flow channel 102.
The two side walls are kept vertical so that the laser detection assembly 107 can receive scattered light generated by the laser light emitted by the laser emission assembly 105 irradiating dust in the fluid to be measured.
Further, a light leakage hole 113 is disposed on a side wall opposite to the side wall where the first hole 106 is disposed, the light leakage hole 113 is aligned with the first hole 106, a extinction region 112 disposed outside the first fluid flow channel 102 is aligned with the light leakage hole 113, and the extinction region 112 receives the laser emitted by the laser emitting component and passing through the first fluid flow channel.
Further, the extinction area 112 is provided with a light-entering surface 112a perpendicular to the laser path of the laser emitting component 105, a reflecting surface 112c intersecting the laser path, and an extinction surface 112b parallel to the laser path, the three surfaces form an isosceles right triangle, and the extinction surface 112b is provided with at least one protrusion 114 for counteracting the light entering the extinction area 112.
The protrusion 114 is an isosceles triangle cone that is 45 ° away from the light entrance surface 102 b. As shown in fig. 6, the extinction region 112 is configured to reduce the influence of the reflected light generated by the laser emission component 105 on the side wall of the first fluid flow channel 102 opposite to the first aperture 106 on the detection result, when the laser emitted by the laser emission component 105 is emitted through the light leakage hole 113, the reflected light irradiates the reflection surface 112c of the extinction region 112 and is reflected, if a part of the reflected light reenters the first fluid flow channel 102 through the light leakage hole 113 to scatter dust in the detected fluid, the scattered light is sensed by the laser detection component 107 again and affects the accuracy of the detection result, so that at least one protrusion 114, preferably an isosceles right triangle, is provided on the extinction surface 102b, so that the reflected light generated by the reflection surface 112c of the extinction region 112 is reflected again, and most of the reflected light can be counteracted by multiple reflections, and the reflected light reentering the first fluid flow channel 102 through the light leakage hole 113 is very small, so that the interference of the light noise on the detection result can be reduced, and the accuracy of the detection result can be improved.
Further, the path of the laser light emitted by the laser light emitting component 105 intersects the flow direction of the measured air flow in the first fluid flow channel 102.
Preferably, the path of the laser light emitted by the laser light emitting component 105 is perpendicular to the flow direction of the measured gas in the first fluid flow channel 102. In this embodiment, only the path of the laser light emitted by the laser light emitting device 105 is perpendicular to the flowing direction of the measured air flow in the first fluid flow channel 102.
Further, the filter element 109 is removably mounted to the first opening 103.
The filter element 109 is convenient to replace in time by arranging the detachable connection mode, and the whole dust detection device does not need to be replaced, so that the effects of improving the filtering effect and prolonging the service life of the dust detection device are achieved.
Further, the filter element 109 includes a frame 109a and a screen 109b mounted in the frame 109a, and the frame 109a is fixed to the edge of the first opening 103.
Further, a latch 103a is disposed on opposite sides of the frame 109a, and a slot 103b corresponding to the latch 103a is disposed on the housing 10.
The number of the buckles and the clamping grooves is not limited, and two pairs of the buckles and the clamping grooves are arranged at opposite positions for illustration in the embodiment.
Further, the screen 109b is in a grid shape.
The filter element 109 may also be a wire mesh filter, a raschel filter, or a paper filter. The shape of the filter may be a net shape or a grid-shaped window, and in this embodiment, the shape of the filter is only exemplified as a grid shape.
Further, the dust concentration detecting device further includes a first chamber 110 disposed on the first opening 103 for accommodating the laser emitting assembly 105, and a third hole 111 opposite to the first hole 106 is disposed on the first chamber 110.
The first aperture 106 is opposite the third aperture 111 to ensure that the laser light emitted by the laser light emitting assembly 105 is emitted into the first air flow channel 102.
The first chamber 110 is provided for fixing and protecting the laser emitting assembly 105, but is not an essential part, and a plurality of chambers may be provided outside the first air circulation passage 102 in the housing 10 for the convenience of processing and cost saving.
The laser emitting assembly 105 includes a laser emitting tube for generating laser light, a converging lens and a diaphragm which are sequentially disposed along a direction of an optical path of the laser light generated by the laser emitting tube.
The corresponding positions of the shell 10 and the circuit board 11 are provided with mounting holes with matched sizes and shapes, and the mounting holes are mutually mounted together through fastening screws.
In summary, the present embodiment provides a dust concentration detection apparatus, where a circuit board assembly of the dust concentration detection apparatus is disposed outside a first air flow channel, a detected air flow flowing through the circuit board is filtered, and a laser emission assembly and a laser detection assembly on the circuit board assembly are in contact with the detected air flow through holes disposed on an outer wall of the first air flow channel; the technical problems that the accuracy of a dust detection result is affected and the service life of the dust detection device is shortened due to the fact that electronic components in the circuit board assembly are easily covered by dust when the circuit board assembly in the dust concentration detection device is exposed to the detected airflow for a long time are solved; the technical effects of ensuring that the air flow flowing through the circuit board assembly is the filtered fresh air flow, reducing the dust coverage of electronic components, improving the accuracy of dust detection results and prolonging the service life of the dust detection device are achieved.
Embodiment two:
A further embodiment of the present invention will now be described with reference to fig. 6, which is different from embodiment 1 shown in fig. 1 in that the first opening 103 of the dust detection device does not include a first chamber 110 for accommodating the laser emitting component 105, and the circuit board assembly 11 including the laser emitting component 105 and the housing 10 are fixed by screws outside the housing 10 and the screw holes 115 on the circuit board assembly 11.
In summary, the present embodiment provides a dust concentration detection apparatus, in which a circuit board assembly of the dust concentration detection apparatus is disposed outside a first air flow channel, a detected air flow flowing through the circuit board is filtered, and a laser emission assembly and a laser detection assembly are contacted with the detected air flow through holes disposed on an outer wall of the first air flow channel; the technical problems that the accuracy of a dust detection result is affected and the service life of the dust detection device is shortened due to the fact that electronic components in the circuit board assembly are easily covered by dust when the circuit board assembly in the dust concentration detection device is exposed to the detected airflow for a long time are solved; the technical effects of ensuring that the air flow flowing through the circuit board assembly is the filtered fresh air flow, reducing the dust coverage of electronic components, improving the accuracy of dust detection results and prolonging the service life of the dust detection device are achieved.
Embodiment III:
The embodiment of the invention also provides air purifying equipment, wherein the air purifying equipment comprises, but is not limited to, an air conditioner, an air purifier, a smoke extractor and a dust removing equipment. The air cleaning apparatus includes any one of the dust concentration detecting devices as in the first embodiment and its alternative embodiments and the second embodiment.
In summary, the embodiment provides an air purifying apparatus, which includes a dust concentration detecting device, and the embodiment provides the dust concentration detecting device, wherein the dust concentration detecting device filters a detected air flow flowing through a circuit board by arranging the circuit board assembly of the dust concentration detecting device outside a first air flow channel, and the laser emitting assembly and the laser detecting assembly are contacted with the detected air flow through holes arranged on the outer wall of the first air flow channel; the technical problems that the accuracy of a dust detection result is affected and the service life of the dust detection device is shortened due to the fact that electronic components in the circuit board assembly are easily covered by dust when the circuit board assembly in the dust concentration detection device is exposed to the detected airflow for a long time are solved; the technical effects of ensuring that the air flow flowing through the circuit board assembly is the filtered fresh air flow, reducing the dust coverage of electronic components, improving the accuracy of dust detection results and prolonging the service life of the dust detection device are achieved.
The specific embodiments described herein are offered by way of illustration only. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
The embodiments described above and features of the embodiments herein may be combined with each other without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A dust concentration detection apparatus is characterized by comprising:
The shell is provided with a first opening and a first air inlet, a first fluid circulation channel communicated with the first air inlet is arranged in the shell, and a first eyelet and a second eyelet are arranged on the side wall of the first fluid circulation channel;
the circuit board assembly is arranged in the shell and is positioned outside the first fluid flow channel, the circuit board assembly comprises a laser emitting assembly and a laser detection assembly, and the laser emitting assembly and the laser detection assembly are positioned outside the first fluid flow channel; the laser emission component is aligned with the first hole and emits laser into the first fluid flow channel through the first hole, the laser detection component is aligned with the second hole and receives light scattered from the first fluid flow channel, and a filter element is arranged at the first opening and used for filtering pollutants in the detected air flow and protecting the circuit board component; the filter element is detachably arranged on the first opening, so that the air flow flowing through the circuit board assembly is filtered fresh air flow, and dust coverage of electronic components is reduced; the filter element comprises a frame body and a filter screen arranged in the frame body, and the frame body is fixed at the edge of the first opening; two opposite sides of the frame body are respectively provided with a buckle, and the shell is provided with a clamping groove corresponding to the buckle; the filter screen is in a grid shape.
2. The dust concentration detecting apparatus according to claim 1, wherein: the air exhaust device is provided with an air inlet surface and an air outlet surface, the air inlet surface is communicated with the first fluid circulation channel, and the air outlet surface is communicated with the air outlet.
3. The dust concentration detecting apparatus according to claim 1, wherein: the first and second holes are formed in two adjacent side walls of the first fluid flow channel.
4. A dust concentration detecting apparatus according to claim 3, wherein: and a light leakage hole is formed in the side wall opposite to the side wall provided with the first eyelet, the light leakage hole is aligned with the first eyelet, a extinction area arranged outside the first fluid circulation channel is aligned with the light leakage hole, and the extinction area receives laser emitted by the laser emitting assembly and penetrates through the first fluid circulation channel.
5. The dust concentration detecting apparatus according to claim 4, wherein: the extinction area is provided with a light inlet surface perpendicular to a laser emitting path of the laser emitting assembly, a reflecting surface intersected with the laser path and an extinction surface parallel to the laser path, the three surfaces form an isosceles right triangle, and the extinction surface is provided with at least one protrusion for counteracting light rays entering the extinction area.
6. The dust concentration detecting apparatus according to claim 5, wherein: the path of the laser emitting component emitting laser is intersected with the flowing direction of the detected airflow in the first fluid flow channel.
7. An air purification apparatus, characterized in that: the air cleaning apparatus includes the dust concentration detecting device according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710358819.9A CN107036949B (en) | 2017-05-19 | 2017-05-19 | Dust concentration detection device and air purification equipment with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710358819.9A CN107036949B (en) | 2017-05-19 | 2017-05-19 | Dust concentration detection device and air purification equipment with same |
Publications (2)
| Publication Number | Publication Date |
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| CN107036949A CN107036949A (en) | 2017-08-11 |
| CN107036949B true CN107036949B (en) | 2024-04-26 |
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| CN201710358819.9A Active CN107036949B (en) | 2017-05-19 | 2017-05-19 | Dust concentration detection device and air purification equipment with same |
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| CN108036481A (en) * | 2017-12-08 | 2018-05-15 | 武汉四方光电科技有限公司 | A kind of air quality detecting device and the vehicles |
| CN108562524A (en) * | 2018-06-13 | 2018-09-21 | 北京博锐尚格节能技术股份有限公司 | Laser light scattering particle analyte detection device |
| CN110780034A (en) * | 2018-07-31 | 2020-02-11 | 常州承信投资合伙企业(有限合伙) | Vehicle and in-vehicle air quality detection equipment with multifunctional sensor thereof |
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| CN105486620A (en) * | 2016-02-02 | 2016-04-13 | 广东美的制冷设备有限公司 | Air purifier, laser dust concentration sensor and detection method thereof |
| CN205374238U (en) * | 2016-02-02 | 2016-07-06 | 广东美的制冷设备有限公司 | Dust concentration sensor and have air purifier of this dust concentration sensor |
| CN206772769U (en) * | 2017-05-19 | 2017-12-19 | 武汉四方光电科技有限公司 | Dust concentration detection means and provided with dust concentration detection means air cleaning facility |
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