CN112557271A - Particulate matter measuring instrument and working method thereof - Google Patents
Particulate matter measuring instrument and working method thereof Download PDFInfo
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- CN112557271A CN112557271A CN202011497498.9A CN202011497498A CN112557271A CN 112557271 A CN112557271 A CN 112557271A CN 202011497498 A CN202011497498 A CN 202011497498A CN 112557271 A CN112557271 A CN 112557271A
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- optical lens
- target sample
- sample gas
- gas channel
- light source
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- 239000013618 particulate matter Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 69
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 abstract description 14
- 239000007924 injection Substances 0.000 abstract description 14
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 12
- 238000007664 blowing Methods 0.000 description 6
- 239000000779 smoke Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 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
-
- 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)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a particulate matter measuring instrument and a working method thereof.A target sample gas channel of the particulate matter measuring instrument penetrates through a measuring gas chamber, and an emission light source component, a sampling component and a calibration component are arranged on the measuring gas chamber and distributed in the circumferential direction of the target sample gas channel; emission light source subassembly, sampling subassembly and calibration subassembly all have optical lens, are in on the target appearance gas channel orientation optical lens's position all is equipped with the through-hole, through-hole and measurement air chamber intercommunication are in on the measurement air chamber optical lens's one side is installed and is sprayed the post, sprays the tangential of the injection direction along the optical lens mirror surface of post. According to the invention, the compressed gas is blown to the surface of the optical lens, so that the particles can be prevented from being deposited on the surface of the optical lens, the surface cleaning and the measuring result of the optical lens are ensured, and the optical lens can be free of maintenance for a long time.
Description
Technical Field
The invention relates to the technical field of particulate matter measurement, in particular to a particulate matter measuring instrument and a working method thereof.
Background
At present, the method is widely applied to the detection of the concentration of particulate matters at home and abroad, after light passes through the smoke particles in the measurement air chamber, the light intensity is weakened, the smoke particles scatter the smoke particles to all directions, and the light signal intensity of all scattering directions is in direct proportion to the concentration of the smoke particles. The intensity of the received light signal scattered by the particles is converted into an electric signal, and the concentration of the particles can be measured through calculation.
At present, research personnel in the field research and development on technical defects of the known technology of the existing measuring instrument device, when a measuring gas chamber is used for sampling, optical lenses in a measuring area of the measuring instrument are seriously polluted due to various particle pollution impurities in the sampled target gas. When optical lens is polluted, can influence particulate matter concentration measurement's accuracy, can't solve this problem in this field at home and abroad always, consequently need a particulate matter measuring apparatu that can reduce optical lens and be polluted, the measuring result is more accurate urgent.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the particulate matter measuring instrument and the working method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a particulate matter measuring instrument comprises a measuring air chamber, a target sample air channel, an emission light source assembly, a sampling assembly, a calibration assembly and an injection column, wherein the target sample air channel penetrates through the measuring air chamber, and the emission light source assembly, the sampling assembly and the calibration assembly are arranged on the measuring air chamber and distributed in the circumferential direction of the target sample air channel; emission light source subassembly, sampling subassembly and calibration subassembly all have optical lens, are in on the target appearance gas channel orientation optical lens's position all is equipped with the through-hole, through-hole and measurement air chamber intercommunication are in on the measurement air chamber optical lens's one side is installed and is sprayed the post, sprays the tangential of the injection direction along the optical lens mirror surface of post.
Preferably, the inlet of the jet column is positioned outside the measuring gas chamber, the outlet of the jet column is positioned on one side of the optical lens, and the jet column is connected with the measuring gas chamber in a sealing mode.
Preferably, the spraying column and the measuring air chamber are connected in a sealing mode through a threaded connection mode and a rubber gasket.
Preferably, the inner wall surface of the jet column is tangent to the optical lens surface.
Preferably, the outlet of the jet column is flared.
Preferably, the outlet cavity of the jet column is in the shape of a section of circular truncated cone, and the corresponding taper angle is 45-60 degrees.
Preferably, a central axis of the optical lens on the emission light source assembly is opposite to and perpendicular to a central axis of the target sample gas channel, a central axis of the optical lens on the sampling assembly is opposite to and perpendicular to a central axis of the target sample gas channel, and an included angle between the central axis of the optical lens on the sampling assembly and the central axis of the optical lens on the emission light source assembly is 100-120 degrees.
Preferably, the central axis of the optical lens of the alignment assembly is parallel to the central axis of the optical lens of the emission light source assembly and is out-of-plane perpendicular to the central axis of the target sample gas channel. The structure of the collimating component is the same as the structure of the emitting light source component.
Preferably, a guide plate is arranged in the measuring air chamber, the guide plate and the injection column are respectively positioned at two sides opposite to the optical lens, and the guide plate is provided with an inclined part inclined towards one side of the through hole on the target sample air channel.
The working method of the particulate matter measuring instrument comprises the following steps:
connecting the jet column with an external compressed air source;
introducing target sample gas from the inlet end of the target sample gas channel, and enabling the target sample gas to flow out from the outlet of the target sample gas channel; the light emitted by the emitting light source component is emitted to the target sample gas in the target sample gas channel from the through hole; after light rays emitted by the emission light source component are scattered by target sample gas in the target sample gas channel, the sampling component receives the scattered light rays;
and the compressed gas source blows compressed gas to the surfaces of the optical lenses on the emission light source component, the sampling component and the calibration component through the injection column, and the compressed gas flows into the target sample gas channel from the through hole on the target sample gas channel and flows out from the outlet of the target sample gas channel.
The invention has the following beneficial effects:
in the particulate matter measuring instrument, the injection column is arranged on the measuring gas chamber on one side of the optical lens, and the injection direction of the injection column is along the tangential direction of the lens surface of the optical lens, so that compressed gas can be intermittently blown onto the optical lens by using the injection column to blow and sweep the surface of the optical lens, and in the continuous work of the particulate matter concentration measuring instrument, the pollution of target sample gas on the optical lens of the gas chamber in a measuring area is avoided, the measurement of the concentration of the target sample gas is not influenced, and the particulate matter concentration measuring instrument can keep stable work for a long time. Therefore, the invention can prevent the optical lens from being polluted, avoid the inaccurate measurement precision of the measurement area caused by the pollution of the optical lens, and simultaneously can lead the optical lens to be free of maintenance for a long time. The optical lenses on the emission light source assembly, the sampling assembly and the calibration assembly respectively correspond to the injection columns, so that each optical lens can be independently blown and swept, and mutual pollution interference during blowing and sweeping is avoided. In addition, through holes are formed in the positions, facing the optical lens, of the target sample gas channel and are communicated with the measuring gas chamber, firstly, the through holes in the target sample gas channel can ensure that light rays emitted by the light emitting source assembly and the calibration assembly are emitted to the target sample gas and enter the sampling assembly after being scattered by particles in the target sample gas, and the concentration of the particles in the target sample gas can be calculated according to light intensity information of the light rays received by the sampling assembly; secondly, the through hole on the target sample gas passage can also serve as a discharge passage for compressed air from the ejection column into the measurement gas chamber.
Furthermore, the outlet of the jetting column is horn-shaped, and a waterfall type direct blowing air curtain can be formed by utilizing the horn-shaped outlet, so that the blowing effect on the surface of the optical lens can be ensured.
Furthermore, through setting up the guide plate, can will sweep the compressed gas who has carried the particulate matter of optical lens and lead the through-hole on the target appearance gas channel and in time discharge, guarantee to measure difficult deposit particulate matter in the air chamber, guarantee measuring effect and long-time non-maintaining.
Drawings
The following figures are a further detailed description of the present invention.
FIG. 1 is a schematic view of the structure of the particle measuring instrument of the present invention.
Fig. 2 is a sectional view of section a-a in fig. 1.
Fig. 3 is an enlarged schematic view of reference numeral 2A in fig. 2.
Fig. 4 is an enlarged schematic view of reference numeral 2B in fig. 2.
Fig. 5 is an enlarged schematic view of reference numeral 2C in fig. 2.
In the figure, 1-jet column, 2-target sample gas inlet, 3-compressed gas inlet, 4-light source, 5-emission light source lens, 6-sampling lens, 7-measuring area, 8-jet column tetrafluoro sealing gasket, 9-optical lens tetrafluoro sealing gasket, 10-target sample gas channel, 10-1-through hole, 11-measuring gas chamber, 12-emission light source component, 13-sampling component, 14-calibration component and 15-guide plate.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1-5, the particle measuring instrument of the present invention includes a measuring gas chamber, a target sample gas channel 10, an emission light source assembly 12, a sampling assembly 13, a calibration assembly 14 and a spray column 1, wherein the target sample gas channel 10 penetrates through the measuring gas chamber, and the emission light source assembly 12, the sampling assembly 13 and the calibration assembly 14 are mounted on the measuring gas chamber and distributed in the circumferential direction of the target sample gas channel 10; the emission light source assembly 12, the sampling assembly 13 and the calibration assembly 14 all have optical lenses, through holes 10-1 are formed in positions, facing the optical lenses, of the target sample gas channel 10, the through holes 10-1 are communicated with a measurement gas chamber, a spray column 1 is installed on one side of each optical lens on the measurement gas chamber, and the spray direction of the spray column 1 is along the tangential direction of the mirror surface of each optical lens.
As a preferred embodiment of the invention, the inlet of the spray column 1 is positioned outside the measuring gas chamber, the outlet of the spray column 1 is positioned on one side of the optical lens, and the spray column 1 is hermetically connected with the measuring gas chamber.
Referring to fig. 3, 3 and 5, the spray column 1 is connected with the measurement air chamber in a threaded manner and in a sealing manner through a rubber gasket.
As a preferred embodiment of the present invention, the inner wall surface of the ejection column 1 is tangent to the optical lens surface.
In a preferred embodiment of the invention, the outlet of the jet column 1 is flared.
Referring to fig. 5, as a preferred embodiment of the present invention, the outlet cavity of the spray column 1 is shaped as a segment of a circular truncated cone, and the corresponding taper angle is 45-60 °.
Referring to fig. 1, the central axis of the optical lens of the emission light source assembly 12 is opposite to and perpendicular to the central axis of the target sample gas channel 10, the central axis of the optical lens of the sampling assembly 13 is opposite to and perpendicular to the central axis of the target sample gas channel 10, and the included angle between the central axis of the optical lens of the sampling assembly 13 and the central axis of the optical lens of the emission light source assembly 12 is 100-120 °.
Referring to fig. 1, as a preferred embodiment of the present invention, the central axis of the optic of the calibration assembly 14 is parallel to the central axis of the optic of the emission light assembly 12 and is out-of-plane with the central axis of the target sample gas channel 10.
Referring to fig. 2, a guide plate 15 is provided in the measurement gas chamber, the guide plate 15 and the spray column 1 are respectively located at two sides opposite to the optical lens, and the guide plate 15 is provided with an inclined portion inclined toward one side of the through hole 10-1 of the target sample gas channel 10.
The jet column 1 can ensure that the optical lens of the measuring area is not polluted by the sampled target gas, and the accuracy of measuring the concentration of the particulate matters is not influenced. And simultaneously, the defects of the devices in the prior industry are overcome.
The particulate matter measuring instrument has three independent gas paths in the measuring area gas chamber, the upper part of the injection column 1 is provided with the compressed gas source inlet 3, and the injection column 1 can form a waterfall type direct blowing gas curtain to ensure the blowing effect on the optical lens.
The jet column is tightly connected with the measuring area air chamber in a threaded manner, and the jet column is arranged at the tight connection part of the jet column and the measuring area air chamber and is formed by a connecting sealing component. The sealing component comprises an optical lens sealing part and a jet column sealing part, and the component and the air chamber are sealed and fastened. The seal assembly includes, but is not limited to, a tetrafluoroethylene rubber gasket. The spray column 1 is installed on the air chamber of the particulate matter concentration measuring device through the tight sealing and fastening of a tetrafluoro sealing gasket of the spray column. The emission light source lens 5 and the sampling lens 6 are tightly sealed and fastened on the air chamber through an optical lens tetrafluoro sealing gasket.
The working method of the particulate matter measuring instrument comprises the following steps:
connecting the injection column 1 with an external compressed air source;
introducing target sample gas from the inlet end of the target sample gas channel 10, and allowing the target sample gas to flow out from the outlet of the target sample gas channel 10; the emission light source component 12 emits light, and the light emitted by the emission light source component 12 is emitted to the target sample gas in the target sample gas channel 10 from the through hole; after the light emitted by the emission light source component 12 is scattered by the target sample gas in the target sample gas channel 10, the sampling component 13 receives the scattered light;
the compressed gas source blows compressed gas to the surfaces of the optical lenses on the emission light source assembly 12, the sampling assembly 13 and the calibration assembly 14 through the jet column 1, and the compressed gas flows into the target sample gas channel 10 from the through hole 10-1 on the target sample gas channel 10 and flows out from the outlet of the target sample gas channel 10.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, the particle measuring instrument of the present invention can intermittently purge the surfaces of the emission light source lens, the sampling lens, and the calibration light source lens through the waterfall type direct-blowing air curtain formed by the injection column 1, so that the particle concentration measuring instrument can avoid the target sample gas from polluting the optical lens of the gas chamber in the measuring area during the continuous operation of the particle concentration measuring instrument, and the measurement of the target sample gas concentration is not affected, so that the particle concentration measuring instrument can keep stable operation for a long time.
Claims (10)
1. The particulate matter measuring instrument is characterized by comprising a measuring gas chamber, a target sample gas channel (10), an emission light source assembly (12), a sampling assembly (13), a calibration assembly (14) and a jet column (1), wherein the target sample gas channel (10) penetrates through the measuring gas chamber, and the emission light source assembly (12), the sampling assembly (13) and the calibration assembly (14) are arranged on the measuring gas chamber and distributed in the circumferential direction of the target sample gas channel (10); emission light source subassembly (12), sampling subassembly (13) and calibration subassembly (14) all have optical lens, are all being equipped with through-hole (10-1) towards on target appearance gas channel (10) optical lens's position, through-hole (10-1) and measurement air chamber intercommunication are in on the measurement air chamber optical lens's one side is installed and is sprayed post (1), and the jet direction that sprays post (1) is along the tangential of optical lens mirror surface.
2. A particle measuring instrument according to claim 1, characterized in that the inlet of the jet column (1) is located outside the measuring gas chamber, the outlet of the jet column (1) is located at one side of the optical lens, and the jet column (1) is hermetically connected with the measuring gas chamber.
3. A particle measuring instrument according to claim 2, characterized in that the jet cylinder (1) is connected to the measuring chamber in a screw connection and a rubber gasket seal.
4. A particle measuring instrument according to claim 1, characterized in that the inner wall surface of the jet cylinder (1) is tangential to the optical lens surface.
5. The particle measuring instrument as claimed in claim 1, wherein the outlet of the jet column (1) is flared.
6. A particle measuring instrument as claimed in claim 5, characterised in that the outlet chamber of the jet cylinder (1) is shaped as a segment of a circular truncated cone with a corresponding cone angle of 45 ° to 60 °.
7. The particle measuring instrument of claim 1, wherein the central axis of the optical lens of the emission light source assembly (12) is opposite to and perpendicular to the central axis of the target sample gas channel (10), the central axis of the optical lens of the sampling assembly (13) is opposite to and perpendicular to the central axis of the target sample gas channel (10), and the central axis of the optical lens of the sampling assembly (13) and the central axis of the optical lens of the emission light source assembly (12) form an included angle of 100 ° to 120 °.
8. A particle measurement instrument as claimed in claim 7, wherein the central axis of the optical lens of the collimating assembly (14) is parallel to the central axis of the optical lens of the emitting light source assembly (12) and is out-of-plane with the central axis of the target sample gas channel (10).
9. The apparatus for measuring particulate matter according to claim 1, wherein a deflector (15) is provided inside the measuring gas chamber, the deflector (15) and the jet cylinder (1) are respectively provided on opposite sides of the optical lens, and the deflector (15) is provided with an inclined portion inclined toward the side of the through hole (10-1) of the target sample gas passage (10).
10. The method of operating a particle measuring instrument as set forth in any one of claims 1-9, characterized by comprising the steps of:
connecting the jet column (1) with an external compressed air source;
introducing target sample gas from the inlet end of the target sample gas channel (10), and enabling the target sample gas to flow out from the outlet of the target sample gas channel (10); the emitting light source component (12) emits light rays, and the light rays emitted by the emitting light source component (12) are emitted to the target sample gas in the target sample gas channel (10) from the through hole; after light emitted by the emitting light source component (12) is scattered by target sample gas in the target sample gas channel (10), the sampling component (13) receives the scattered light;
and a compressed gas source blows compressed gas to the surfaces of optical lenses on the emission light source component (12), the sampling component (13) and the calibration component (14) through the jet column (1), and the compressed gas flows into the target sample gas channel (10) from the through hole (10-1) on the target sample gas channel (10) and flows out from the outlet of the target sample gas channel (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011497498.9A CN112557271A (en) | 2020-12-17 | 2020-12-17 | Particulate matter measuring instrument and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011497498.9A CN112557271A (en) | 2020-12-17 | 2020-12-17 | Particulate matter measuring instrument and working method thereof |
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| Publication Number | Publication Date |
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| CN112557271A true CN112557271A (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011497498.9A Pending CN112557271A (en) | 2020-12-17 | 2020-12-17 | Particulate matter measuring instrument and working method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130134243A (en) * | 2012-05-30 | 2013-12-10 | 연세대학교 산학협력단 | Particle sampling cell and laser measurement system contains the same |
| CN107478557A (en) * | 2017-09-20 | 2017-12-15 | 张家港朗亿机电设备有限公司 | A kind of detection means of dust concentration detector |
| CN107576601A (en) * | 2017-09-20 | 2018-01-12 | 张家港朗亿机电设备有限公司 | Suitable for the particulate matter on-line checking and analysis meter in urban track traffic place |
| CN109883914A (en) * | 2019-03-25 | 2019-06-14 | 中兴仪器（深圳）有限公司 | A kind of flue dust optical detection apparatus |
| CN210894021U (en) * | 2019-10-22 | 2020-06-30 | 中国矿业大学(北京) | Mine dust monitoring device based on image |
| CN214066845U (en) * | 2020-12-17 | 2021-08-27 | 西安鼎研科技股份有限公司 | Particulate matter measuring apparatu |
-
2020
- 2020-12-17 CN CN202011497498.9A patent/CN112557271A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130134243A (en) * | 2012-05-30 | 2013-12-10 | 연세대학교 산학협력단 | Particle sampling cell and laser measurement system contains the same |
| CN107478557A (en) * | 2017-09-20 | 2017-12-15 | 张家港朗亿机电设备有限公司 | A kind of detection means of dust concentration detector |
| CN107576601A (en) * | 2017-09-20 | 2018-01-12 | 张家港朗亿机电设备有限公司 | Suitable for the particulate matter on-line checking and analysis meter in urban track traffic place |
| CN109883914A (en) * | 2019-03-25 | 2019-06-14 | 中兴仪器（深圳）有限公司 | A kind of flue dust optical detection apparatus |
| CN210894021U (en) * | 2019-10-22 | 2020-06-30 | 中国矿业大学(北京) | Mine dust monitoring device based on image |
| CN214066845U (en) * | 2020-12-17 | 2021-08-27 | 西安鼎研科技股份有限公司 | Particulate matter measuring apparatu |
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