CN111366513A - Gas curtain protection device for detecting particulate matters through laser scattering - Google Patents
Gas curtain protection device for detecting particulate matters through laser scattering Download PDFInfo
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- CN111366513A CN111366513A CN202010333236.2A CN202010333236A CN111366513A CN 111366513 A CN111366513 A CN 111366513A CN 202010333236 A CN202010333236 A CN 202010333236A CN 111366513 A CN111366513 A CN 111366513A
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- 230000001681 protective effect Effects 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 86
- 238000004140 cleaning Methods 0.000 description 11
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
-
- 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
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses an air curtain protection device for detecting particles through laser scattering, which comprises an air chamber, a gas inlet and a gas outlet, wherein the air chamber is provided with the gas inlet and the gas outlet; a laser located on one side of the gas cell; a receiver located at the other side of the gas chamber; the laser and the receiver are connected with the air chamber sequentially through a protective lens and an air curtain chamber; the air curtain chamber is the toper air curtain chamber, the air curtain chamber sets up the air inlet outward, follows the gas that the air inlet got into is in the indoor rotatory air curtain that forms two kinds of motion opposite directions of air curtain chamber. The protective gas forms a three-dimensional gas curtain in two movement directions in the gas curtain cavity, so that the sample gas to be detected and the protective gas can be effectively isolated, and meanwhile, the protective lenses can be cleaned by the spiral gas flow, and the maintenance period of the protective lenses is prolonged; the operation cost of the detection instrument is saved.
Description
Technical Field
The invention relates to the field of environmental monitoring, including oil fume monitoring, dust emission monitoring, smoke monitoring and the like, in particular to an air curtain protection device for detecting particles through laser scattering.
Background
The existing dust measurement equipment generally adopts equipment taking a laser sensor as a core, gas to be measured enters the laser sensor, laser emitted by a laser penetrates through sampling gas, dust in the gas is scattered near a laser focus or parallel light, a photosensitive tube opposite to the laser receives light intensity to generate an electric signal, and the electric signal is processed by an amplifying circuit and a CPU to obtain a readable signal to be output so as to obtain a measured value. If no protection (protection blowing) measures are taken, optical elements in the laser can be very easily contacted with suspended matters, and when pollutants fall on the surface of a lens, energy can be absorbed from a laser beam, so that the output power of the laser is reduced, and the processing capacity of the laser is sharply reduced; on the other hand, heat is generated, and the lens and the optical film on the surface are damaged after a long time.
Current patent CN208408890U discloses a laser working head gas curtain protection device, including interior shower nozzle and outer shower nozzle, interior shower nozzle and outer shower nozzle interference fit, interior shower nozzle is connected with the laser working head, be equipped with gas inlet on the outer shower nozzle, gas inlet passes through the trachea with the air compressor machine and links to each other, be equipped with an annular chamber between interior shower nozzle and the outer shower nozzle, annular chamber and gas inlet intercommunication are equipped with gas outlet on the annular chamber, the annular gas outlet of venthole and annular chamber bottom on the shower nozzle including setting up of gas outlet, the annular gas outlet is formed by the clearance that interior shower nozzle and outer shower nozzle bottom junction left. Prior patent CN105397287A discloses a dust collector of carbon dioxide laser drilling machine, includes: a housing which is hermetically enclosed at the periphery of the laser and the workbench; a first air supply unit installed on the top plate and the bottom plate of the housing to make the air in the housing form a turbulent state; a second air supply unit mounted on the side wall of the housing for spraying an air curtain to the lens of the laser; and an exhaust unit installed outside the enclosure for sucking out the fumes and debris left in the enclosure during processing; the first air supply unit and the air exhaust unit are communicated with the hollow cavity of the housing, and the air exhaust unit is arranged at the lower part of the housing.
In summary, the existing air curtain protection schemes form a narrow slit with a diameter of 0.2-0.4mm in front of the lens, and on the other hand, the air curtain formed after the air is blown out from the slit is a surface. The air curtain structure only passively protects the lens, and can not actively clean the lens and prevent particles from entering the laser air chamber; on the other hand, the slit structure has extremely high requirements on processing and mounting precision, and once deviation occurs, subsequent detection precision is influenced. Therefore, there is a need for an air curtain protection device for detecting particles by laser scattering, which can improve the defects in the prior art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the air curtain protection device for detecting the particles through laser scattering, which has the advantages of simple structure, part cost saving, simple assembly operation, improvement of assembly quality, prolongation of the maintenance and cleaning period of the protection lens and operation cost saving of a detection instrument.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air curtain protection device for detecting particles by laser scattering comprises
The gas chamber is provided with a sample gas inlet and a sample gas outlet;
a laser located on one side of the gas cell;
a receiver located at the other side of the gas chamber;
the laser and the receiver are connected with the air chamber sequentially through a protective lens and an air curtain chamber; the air curtain chamber is the toper air curtain chamber, the air curtain chamber sets up the air inlet outward, follows the gas that the air inlet got into is in the indoor two kinds of rotatory air curtains that form the opposite direction of motion of air curtain.
In some embodiments of the present invention, an included angle between the air inlet and a tangent of the air inlet on the inner wall of the air curtain chamber is an obtuse angle.
In some embodiments of the present invention, the obtuse angle ranges from 100 to 120 °.
In some embodiments of the invention, the cross-sectional area of the air curtain cavity decreases in a direction approaching the air chamber.
In some embodiments of the invention, the air inlet is tangential to an inner wall of the air curtain chamber.
In some embodiments of the invention, the two rotating air curtains comprise a clean air curtain moving towards the protective lens and a separate air curtain moving towards the plenum.
In some embodiments of the present invention, the air curtain protection device further includes an air pump disposed at the sample gas outlet, and configured to form a negative pressure in the air chamber to facilitate the discharge of the sample gas.
In some embodiments of the present invention, the air curtain protection device further comprises an optical trap disposed opposite the laser from the air chamber, the optical trap being located above the receiver.
In some embodiments of the invention, the light emitting direction of the laser is at an angle a to the light sensing direction of the receiver, wherein the angle a is in the range of 10 ° < a <20 °.
The working principle of the invention is as follows:
the air curtain chamber is filled with protective air with certain air pressure, and the protective air enters the air curtain chamber through the air inlet to form spiral air flows in two motion directions, namely a rotary air curtain; under the action of the negative pressure of the air pump, one part of the air curtain is an isolated air curtain and directly moves spirally towards the air chamber to prevent sample air from entering the air curtain chamber; the other part is a cleaning air curtain which moves spirally towards the protective lens in the reverse direction to clean the protective lens; after reaching the protective lens, the cleaning air curtain finally enters the air chamber under the action of the negative pressure of the air pump.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
firstly, the conical air curtain cavity is adopted, the protective gas forms rotary air curtains in two movement directions in the air curtain cavity, so that the sample gas to be detected and the protective gas can be effectively isolated, meanwhile, the protective lenses can be cleaned by the rotary air flow, and the maintenance period of the protective lenses is prolonged.
The receiver and the laser are not arranged on the same horizontal line but arranged at a certain included angle, and the focus of the light emitting direction and the light sensing direction is positioned on the connecting line of the gas inlet and the gas outlet of the sample gas to be detected, so that the detection data are more accurate.
The air curtain protection device adopted in the invention has the advantages of simple structure, part cost saving, simple assembly operation, effective improvement of assembly quality, better protection effect than the previous scheme, prolongation of the maintenance and cleaning period of the lens and operation cost saving of the detection instrument.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an air curtain protection device for detecting particles through laser scattering in embodiment 1.
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1.
Fig. 3 is a schematic cross-sectional view of B-B in fig. 2.
Fig. 4 is a schematic view of the flow direction of the air in the first air curtain chamber in embodiment 1.
Fig. 5 is a schematic structural axial view of the air curtain protection device for detecting particles through laser scattering in example 1.
Reference numerals: 1-a laser; 2-air chamber; 3-a receiver; 4-sample gas inlet; 5-sample gas outlet; 6-a first air curtain chamber; 61-a first joint; 62-a first air inlet; 7-a second air curtain chamber; 71-a second linker; 72-a second air inlet; 8-light trap; 9-a first protective lens; 10-second protective lens.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
Example 1
As shown in fig. 1 and 2, an air curtain protection device for detecting particles by laser scattering includes a laser 1, a gas chamber 2, a receiver 3, a sample gas inlet 4, a sample gas outlet 5, a first air curtain chamber 6, a second air curtain chamber 7, a light trap 8, a first protective lens 9, and a second protective lens 10.
Wherein, the upper surface and the lower surface of the air chamber 2 are respectively provided with a sample gas inlet 4 and a sample gas outlet 5; the sample gas outlet 5 is provided with an air pump (not shown in the figure) for forming a negative pressure in the air chamber 2 to facilitate the discharge of the sample gas. For the laser 1, it is located on one side of the gas cell 2; is connected with the air chamber 2 through a first protective lens 9 and a first air curtain chamber 6 in sequence. For the receiver 3, it is located on the other side of the gas cell 2; is connected with the air chamber 2 through a second protective lens 10 and a second air curtain chamber 7 in sequence. The air curtain protection device further comprises a light trap 8, the light trap 8 and the laser 1 are symmetrically arranged relative to the air chamber 2, the light trap 8 is located above the receiver 3, namely the light trap 8 and the laser 1 are arranged on the same horizontal line, and laser emitted by the laser 1 can be conveniently received. In this embodiment, the light emitting direction of the laser 1 forms an angle a with the light sensing direction of the receiver 3, wherein the angle a is 15 °; the focus of the light emitting direction and the light sensing direction is located on the connecting line of the sample gas inlet 4 and the sample gas outlet 5, so that the detection data is more accurate, as shown in fig. 5.
The first air curtain chamber 6 and the second air curtain chamber 7 have the same structure and components. A first joint 61 and a first air inlet 62 are arranged outside the first air curtain chamber 6; the first joint 61 is connected to the first air inlet 62, and as shown in fig. 3, an included angle between the first air inlet 62 and a tangent line of the air inlet on the inner wall of the first air curtain chamber 6 is an obtuse angle. In the direction close to the gas cell 2, the cross-sectional area of the first gas curtain chamber 6 gradually decreases, i.e. a conical gas curtain chamber is formed. The first air inlet 62 is tangential to the inner wall of the first curtain chamber 6. After the shielding gas is connected to the first connector 61, the shielding gas enters the first gas curtain chamber 6 through the first gas inlet 62, and the shielding gas filled into the first gas curtain chamber 6 has certain gas pressure, so that the shielding gas can be divided into three-dimensional rotating dynamic gas curtains in two movement directions in the first gas curtain chamber 6; as shown in fig. 4, a cleaning air curtain which rotates clockwise and moves toward the first protective lens 9, and the cleaning air curtain which moves spirally can effectively clean the first protective lens 9; the other is an isolated air curtain which rotates clockwise and moves towards the air chamber 2, so that the sample gas can be prevented from entering the first air curtain chamber 6; the cleaning gas curtain likewise enters the gas chamber 2 in the form of a spiral gas curtain after reaching the first protective lens 9 under the action of the gas pump. On the side of the receiver 3, the second curtain chamber 7 is identical in structure and mounting position to the first curtain chamber 6; similarly, a second joint 71 and a second air inlet 72 are arranged outside the second air curtain chamber 7; the second joint 71 is connected with a second air inlet 72; the angle between the second air inlet 72 and the tangent to the air inlet on the inner wall of the second air curtain chamber 7 is obtuse. In the direction close to the gas cell 2, the cross-sectional area of the second gas curtain chamber 7 gradually decreases, i.e. a conical gas curtain chamber is formed. The second air inlet 72 is tangential to the inner wall of the second curtain chamber 7. After the shielding gas is connected to the second joint 71, the shielding gas enters the second gas curtain chamber 7 through the second gas inlet 72, and the shielding gas filled into the second gas curtain chamber 7 has certain gas pressure, so that two spiral gas flows formed by the shielding gas in the second gas curtain chamber 7 can be ensured; a spiral air flow can clean the second protective lens 10 in real time, and the maintenance period of the protective lens is prolonged; the other spiral air stream moves towards the air chamber 2 and prevents the sample gas from entering the second curtain chamber 7 and thus avoids contamination of the second protective lens 10 and the receiver 3.
The working principle of the invention is as follows:
when the air pump is started, after the sample gas enters the sample gas inlet 4, protective gas with certain air pressure is introduced into the first connector 61 and the second connector 71, and the protective gas enters the first gas curtain chamber 6 and the second gas curtain chamber 7 through the first air inlet 62 and the second air inlet 72, because the inner wall of each gas curtain chamber is conical and the included angle between each air inlet and the tangent line of the air inlet on the inner wall of the gas curtain chamber is an obtuse angle, in the embodiment, preferably 100-120 degrees is selected, so that the rotary air flow in two directions can be ensured to have certain strength, the air flow in two opposite directions can rotate in the gas curtain chamber to form a three-dimensional rotary gas curtain, one part is an isolation gas curtain, and the air curtain directly moves towards the gas chamber 2 in a spiral manner to prevent the sample gas from entering the first gas curtain chamber 6 and the second gas curtain chamber 7 under the action of negative pressure; the other part is a cleaning air curtain which moves spirally towards the first protective lens 9 and the second protective lens 10 in a reverse direction to generate cleaning effect; after reaching the respective protective lens, the cleaning air curtain finally enters the air chamber 2, also under the negative pressure of the air pump. The air curtain protection device adopted in the invention has the advantages of simple structure, part cost saving, simple assembly operation, effective improvement of assembly quality, better protection effect than the previous scheme, prolongation of the maintenance and cleaning period of the lens and saving of the operation cost of the detection instrument.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An air curtain protection device for detecting particles through laser scattering is characterized by comprising
The gas chamber is provided with a sample gas inlet and a sample gas outlet;
a laser located on one side of the gas cell;
a receiver located at the other side of the gas chamber;
the laser and the receiver are connected with the air chamber sequentially through a protective lens and an air curtain chamber; the air curtain chamber is the toper air curtain chamber, the air curtain chamber sets up the air inlet outward, follows the gas that the air inlet got into is in the indoor two kinds of rotatory air curtains that form the opposite direction of motion of air curtain.
2. The air curtain protection device for detecting the particles through laser scattering of claim 1, wherein an included angle between the air inlet and a tangent line at the air inlet on the inner wall of the air curtain chamber is an obtuse angle.
3. The gas curtain protection device for detecting particles through laser scattering as claimed in claim 2, wherein the obtuse angle ranges from 100 ° to 120 °.
4. The gas curtain protection device for the laser scattering detection of particles as claimed in claim 2, wherein the cross-sectional area of the gas curtain cavity decreases gradually in the direction close to the gas chamber.
5. The gas curtain protection device for the laser scattering detection of particles as claimed in claim 1, wherein the gas inlet is tangential to the inner wall of the gas curtain cavity.
6. The gas curtain protection device for the laser scattering detection of particles as claimed in claim 1, wherein said two kinds of rotating gas curtains include a clean gas curtain moving toward said protection lens and a separation gas curtain moving toward said gas chamber.
7. The air curtain protection device for detecting the particulate matters through laser scattering according to claim 1, further comprising an air pump, which is arranged at the sample gas outlet and is used for forming a negative pressure in the air chamber to facilitate the discharge of the sample gas.
8. The gas curtain protection device for detecting the particles through laser scattering of claim 1, further comprising an optical trap, wherein the optical trap is arranged opposite to the gas chamber relative to the laser, and the optical trap is positioned above the receiver.
9. The air curtain protection device for detecting particles through laser scattering according to claim 1, wherein the light emitting direction of the laser is at an angle a with the light sensing direction of the receiver, wherein the angle a is in a range of 10 ° < a <20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010333236.2A CN111366513A (en) | 2020-04-24 | 2020-04-24 | Gas curtain protection device for detecting particulate matters through laser scattering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010333236.2A CN111366513A (en) | 2020-04-24 | 2020-04-24 | Gas curtain protection device for detecting particulate matters through laser scattering |
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| Publication Number | Publication Date |
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| CN111366513A true CN111366513A (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010333236.2A Pending CN111366513A (en) | 2020-04-24 | 2020-04-24 | Gas curtain protection device for detecting particulate matters through laser scattering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577690A (en) * | 2022-03-08 | 2022-06-03 | 杭州云斐科技有限公司 | Particulate matter concentration detection device |
| CN115672863A (en) * | 2022-09-21 | 2023-02-03 | 沪东中华造船(集团)有限公司 | Auxiliary cleaning device for marine pipeline endoscope lens |
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| US4303824A (en) * | 1980-05-12 | 1981-12-01 | Gte Automatic Electric Laboratories, Inc. | Method and apparatus protecting a lens from airborne particulates |
| US4784491A (en) * | 1986-06-03 | 1988-11-15 | General Electric Company | System to protect optics against dirty environments |
| WO2012126469A1 (en) * | 2011-03-23 | 2012-09-27 | Danfoss Ixa A/S | Gas sensor with vortex |
| US20120287418A1 (en) * | 2010-10-14 | 2012-11-15 | Scherer James J | High-Accuracy Mid-IR Laser-Based Gas Sensor |
| CN204470207U (en) * | 2015-02-02 | 2015-07-15 | 建滔（清远）玻璃纤维有限公司 | Glass fabric surface dust cleaning apparatus |
| WO2018219550A1 (en) * | 2017-05-30 | 2018-12-06 | Robert Bosch Gmbh | Gas sensor |
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| CN212008231U (en) * | 2020-04-24 | 2020-11-24 | 青岛明德环保仪器有限公司 | Gas curtain protection device for detecting particulate matters through laser scattering |
-
2020
- 2020-04-24 CN CN202010333236.2A patent/CN111366513A/en active Pending
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| US4784491A (en) * | 1986-06-03 | 1988-11-15 | General Electric Company | System to protect optics against dirty environments |
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| Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577690A (en) * | 2022-03-08 | 2022-06-03 | 杭州云斐科技有限公司 | Particulate matter concentration detection device |
| CN115672863A (en) * | 2022-09-21 | 2023-02-03 | 沪东中华造船(集团)有限公司 | Auxiliary cleaning device for marine pipeline endoscope lens |
| CN115672863B (en) * | 2022-09-21 | 2024-06-11 | 沪东中华造船(集团)有限公司 | Marine pipeline endoscope lens auxiliary cleaning device |
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