CN104458524B - Optical platform of transmission type smoke meter with lens protection - Google Patents
Optical platform of transmission type smoke meter with lens protection Download PDFInfo
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- CN104458524B CN104458524B CN201410755750.XA CN201410755750A CN104458524B CN 104458524 B CN104458524 B CN 104458524B CN 201410755750 A CN201410755750 A CN 201410755750A CN 104458524 B CN104458524 B CN 104458524B
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Abstract
The invention relates to a diesel vehicle smoke measuring device, in particular to an optical platform of a lens-protected transmission smoke meter, which comprises a fan, a detection pipeline, an air chamber pipeline, a smoke inlet pipe and a photoelectric detection unit; according to the invention, the protection lens device is added, so that the direct contact between the exhaust smoke of the engine containing oil gas and the surface of the lens is avoided, the protection lens device can be conveniently pulled out for cleaning, and the use convenience and the overall performance of the instrument are improved to a great extent.
Description
Technical Field
The invention relates to a diesel vehicle smoke measuring device.
Background
Emissions pollutants from diesel vehicles pose a significant hazard to human health and the environment, and increasingly stringent emissions regulations are being enacted worldwide to limit the levels of emissions pollutants from diesel engines. These increasingly stringent emission regulations have driven not only the development of engine technology but also the development of detection technology. The detection methods specified in GB3847-2005 'vehicle compression ignition engine and compression ignition engine automobile exhaust smoke emission limit value and measurement method' are two types: free acceleration and load deceleration. According to the outline of the long-range view target of the Chinese environment protection, the important city should reach the national atmospheric environment quality secondary standard. In order to improve the air quality of urban environment as soon as possible, the standards in various places gradually require that all detection mechanisms measure the emission concentration of particulate matters in pollutant discharged by the diesel vehicle by adopting a loading and decelerating detection method. The concentration of particulate matter emitted from a diesel vehicle is usually measured by a transmission smoke meter, and the concentration of particulate matter is determined by using the transmission coefficient of smoke. Transmission smoke meters measure visible objects using the Beer-Lambert theorem. When the parallel light beam passes through the air chamber, the light is absorbed and scattered (reflected, refracted, etc.) by the visible matter in the air chamber, so that the intensity of the light is attenuated, and the detection device detects the changed photocurrent signal, thereby obtaining a detection result, wherein the intensity attenuation=the absorption amount+the scattering amount. The transmission smoke meter consists of a gas sampling module, an optical measurement module and a control display module. The optical measuring module mainly comprises an optical platform and data acquisition, and is mainly used for continuously measuring the smoke discharged by the motor vehicle, dynamically reflecting the change of exhaust pollutants, transmitting the measurement result to a control display part for display, wherein the optical platform is designed as a core of a transmission smoke meter, fans (centrifugal fans) on two sides of the optical platform are used for outward blowing to form negative pressure, and the smoke discharged from the position of an air inlet pipe into an air chamber flows towards two sides under the action of the fans.
Particularly, when the diesel vehicle is subjected to a loading deceleration test, dense smoke exhausted by the diesel vehicle is directly sucked into an instrument not by the action of an air curtain, but by the gas of an exhaust pipe, the gas is directly pressed into an optical platform, so that part of the gas sprayed by the gas can be directly sprayed onto a collimating lens and a converging lens in the optical platform, and the smoke contains oil gas and carbon particles, so that the mixture is extremely easy to form deposition on the surfaces of a light-emitting diode collimating lens and a photodiode converging lens. If the surfaces of the two lenses are provided with the protective glass, dirt deposition is formed on the surfaces of the protective glass, so that the light emitted by the light-emitting diode is attenuated, the signals received by the photodiode are too weak to work normally when the light-emitting diode is used for a long time, and particularly, the maintenance frequency of a highly polluted diesel vehicle is very frequent.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a novel optical platform of a transmission smoke meter, which is additionally provided with a device for protecting lenses, so that the use convenience and the overall performance of the instrument are improved to a great extent.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides an optical platform of transmission type smoke meter of lens protection, this platform includes fan, detection pipeline, air chamber pipeline, flue gas intake pipe and photoelectric detection unit, fan, detection pipeline be two sets respectively, detection pipeline connect the fan, two detection pipelines connect the both ends of air chamber pipeline respectively, the flue gas intake pipe sets up in the middle part of air chamber pipeline, photoelectric detection unit set up on detection pipeline, photoelectric detection unit includes photoelectric receiving circuit board, photoelectric plate fixing base, collimating lens and convergent lens, has set gradually interconnect's cavity, light trap and lens mounting mouth in the photoelectric plate fixing base, the cavity sets up the left end at the photoelectric plate fixing base, photoelectric receiving circuit board sets up at the tip of cavity seal the cavity, the lens mounting mouth set up the right-hand member at the photoelectric plate fixing base, collimating lens and convergent lens install and set up in the lens mounting mouth; the center of the photoelectric receiving circuit board is provided with a photoelectric receiving tube which is positioned on the focal plane of the converging lens; the side wall of the detection pipeline is provided with a detection hole, a lens protection device is arranged between the detection hole and the photoelectric detection unit, the lens protection device consists of an inserting sheet fixing seat and a protection inserting sheet, the inserting sheet fixing seat is provided with a transverse light through hole and a longitudinal inserting sheet hole, one end of the transverse light through hole is butted with the detection hole, and the other end of the transverse light through hole is butted with a lens mounting port on the photoelectric plate fixing seat; the protection inserted sheet insert and establish and cut horizontal light through-hole in vertical inserted sheet downthehole, be provided with the glass erection mouth on the protection inserted sheet, the left side of glass erection mouth is provided with protection glass, protection glass just to horizontal light through-hole setting.
Preferably, the photoelectric plate fixing seat is fixedly arranged on the inserting sheet fixing seat through bolts, and the inserting sheet fixing seat is connected with the detection pipeline through bolts. The disassembly, assembly and maintenance are convenient through the connection mode of the bolts.
Preferably, a first sealing ring is arranged at the joint of the transverse light through hole and the lens mounting opening. The arrangement of the first sealing ring can prevent the air from entering the cavity to pollute electronic equipment such as a photoelectric receiving tube.
Preferably, a second sealing ring is arranged on the right side of the glass mounting opening, and the second sealing ring seals a gap between the protection inserting sheet and the longitudinal inserting sheet hole. The second sealing ring is used for reducing gas pollution to the converging lens.
Preferably, a bolt connection port is arranged between the photoelectric plate fixing seat and the circuit board of the photoelectric detection unit, and the circuit board of the photoelectric detection unit is provided with an external connection joint which is directly connected to the external driving and processing control unit.
Preferably, the air chamber pipeline is connected with the detection pipeline through a connecting seat, the detection pipelines at two sides are of asymmetric structures, the air flow inlets of the detection pipelines are respectively connected with the fan, and the air chamber pipeline is connected with the flue gas inlet of the detection pipeline.
Preferably, the air chamber pipeline adopts a bending structure, and the outlet of the air chamber pipeline is obliquely arranged to the flue gas inlet of the detection pipeline. Under the condition of not influencing the emission and the reception in the optical path system, the direction of the air flow is changed, and the problem of direct pollution to the lens caused by direct injection of the engine is greatly avoided.
Preferably, the heating device is arranged on the outer side of the air chamber pipeline, and two heating belts with direct current power supply are fixed on the two sides of the air chamber pipeline, so that the production efficiency is greatly improved.
Preferably, a fixing plate is fixed at the middle part of the air chamber pipeline through a screw, the fixing plate is inserted into the open slot, and a flue gas inlet pipe is arranged on the fixing plate; the flue gas inlet pipe adopts a structure with a bending angle. The pressure of the air inlet is buffered to a great extent, the air can form uniform air flow in the air chamber pipeline, the air is discharged by the effect of the air curtain, the uniform diffusion of the air can be realized, and the direct impact of the air flow on the surface of the lens can be avoided.
Preferably, the platform further comprises a photoelectric detection reference unit, the side wall of the cavity is provided with a reference unit mounting opening, and the photoelectric detection reference unit is arranged on the reference unit mounting opening. The problem of low measurement sensitivity caused by the self-attenuation of the LEDs is automatically adjusted through the reference channel, and the measurement sensitivity of the optical system is improved.
Due to the adoption of the technical scheme, the protection lens device is added, so that the direct contact between the exhaust smoke of the engine containing oil gas and the surface of the lens is avoided, the protection lens device can be conveniently pulled out for cleaning, and the use convenience and the overall performance of the instrument are improved to a great extent. In addition, the invention adopts standardized part processing, simplifies the structure of the product, and improves the production efficiency and the connection accuracy.
Drawings
Fig. 1 is a schematic illustration of the front cross-section of the present invention.
Fig. 2 is a front view of the present invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a right side view of fig. 2.
Fig. 5 is a cross-sectional view A-A of fig. 2.
Fig. 6 is a schematic structural diagram of the photodetecting unit.
Fig. 7 is a schematic structural view of the lens protection device.
Fig. 8 is a schematic structural view of the protection insert.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings.
The optical platform of the lens-protected transmission type smoke meter comprises a fan 4, detection pipelines 3, an air chamber pipeline 2, a smoke air inlet pipe 1, a photoelectric detection reference unit and a photoelectric detection unit 10, wherein the number of the fan 4 and the detection pipelines 3 is two, the two detection pipelines 3 are respectively connected with two ends of the air chamber pipeline 2, and the smoke air inlet pipe 1 is arranged in the middle of the air chamber pipeline 2. The air chamber pipeline 2 adopts a bending structure, and the outlet of the air chamber pipeline 2 is obliquely arranged on the flue gas inlet of the detection pipeline 3. The air chamber pipeline 2 and the detection pipeline 3 are connected by a connecting seat 8, the detection pipelines 3 on two sides are of asymmetric structures, the air flow inlets of the detection pipelines 3 are respectively connected with the fan 4, and the air chamber pipeline 2 is connected with the flue gas inlet of the detection pipeline 3. The outside of air chamber pipeline 2 is equipped with heating device 15, heating device 15 adopt two direct current power supply's heating band to fix in the both sides of air chamber pipeline 2, the middle part of air chamber pipeline 2 is through the fix with screw, the fixed plate inserts and establishes in the open slot, sets up flue gas intake pipe 1 on the fixed plate, flue gas intake pipe 1 adopts the structure of bending angle.
As shown in fig. 5 and 6, the photodetection unit 10 is disposed on the detection pipeline 3, the photodetection unit 10 includes a photodetection circuit board 7, a photodetection board fixing seat 6, a collimating lens 11 and a converging lens 12, a cavity 61, a light hole 62 and a lens mounting opening 63 which are connected with each other are sequentially disposed in the photodetection board fixing seat 6, the cavity 61 is disposed at the left end of the photodetection board fixing seat 6, the photodetection circuit board 7 is disposed at the end of the cavity 61 to close the cavity 61, a reference unit mounting opening is disposed on the side wall of the cavity 61, and the photodetection reference unit 10 is disposed on the reference unit mounting opening. The problem of low measurement sensitivity caused by the self-attenuation of the LEDs is automatically adjusted through the reference channel, and the measurement sensitivity of the optical system is improved. As shown in fig. 5, the lens mounting opening 63 is arranged at the right end of the photoelectric board fixing seat 6, and the collimating lens 11 and the converging lens 12 are mounted in the lens mounting opening 63; the center of the photoelectric receiving circuit board 7 is provided with a photoelectric receiving tube 71, and the photoelectric receiving tube 71 is positioned on the focal plane of the converging lens 12. A bolt connection port is arranged between the photoelectric plate fixing seat 6 and the circuit board of the photoelectric detection unit 10, and the circuit board of the photoelectric detection unit 10 is provided with an external connection joint and is directly connected to an external driving and processing control unit.
As shown in fig. 1 and 7, the side wall of the detection pipeline 3 is provided with a detection hole 31, a lens protection device is arranged between the detection hole 31 and the photoelectric detection unit 10, the lens protection device is composed of an inserting sheet fixing seat 5 and a protection inserting sheet 9, bolts are arranged between the inserting sheet fixing seat 5 and the detection pipeline 3 to be connected, and the photoelectric plate fixing seat 6 is fixedly arranged on the inserting sheet fixing seat 5 through the bolts. The insert fixing seat 5 is provided with a transverse light through hole 51 and a longitudinal insert hole 52, one end of the transverse light through hole 51 is butted with the detection hole 31, the other end is butted with a lens mounting port 63 on the photoelectric plate fixing seat 6, and a first sealing ring 13 is arranged at the butted position of the transverse light through hole 51 and the lens mounting port 63. As shown in fig. 8, the protection insert 9 is inserted into the longitudinal insert hole 52 to intercept the transverse light through hole 51, a glass mounting opening 91 is provided on the protection insert 9, a protection glass 91 is provided on the left side of the glass mounting opening 90, the protection glass 91 is disposed opposite to the transverse light through hole 51, a second sealing ring 92 is provided on the right side of the glass mounting opening 90, and the second sealing ring 92 seals a gap between the protection insert 9 and the longitudinal insert hole 52.
Claims (8)
1. The utility model provides an optical platform of transmission type smoke meter of lens protection, this platform includes fan (4), detection pipeline (3), air chamber pipeline (2), flue gas intake pipe (1) and photoelectric detection unit, fan (4), detection pipeline (3) be two sets respectively, detection pipeline (3) connect fan (4), two detection pipeline (3) connect the both ends of air chamber pipeline (2) respectively, flue gas intake pipe (1) set up the middle part in air chamber pipeline (2), photoelectric detection unit set up on detection pipeline (3), photoelectric detection unit includes photoelectric receiving circuit board (7), photoelectric plate fixing base (6), collimating lens (11) and convergent lens (12), its characterized in that: a cavity (61), a light hole (62) and a lens mounting opening (63) which are connected with each other are sequentially formed in the photoelectric plate fixing seat (6), the cavity (61) is formed in the left end of the photoelectric plate fixing seat (6), the photoelectric receiving circuit board (7) is arranged at the end part of the cavity (61) to seal the cavity (61), the lens mounting opening (63) is formed in the right end of the photoelectric plate fixing seat (6), and the collimating lens (11) and the converging lens (12) are mounted in the lens mounting opening (63); the center of the photoelectric receiving circuit board (7) is provided with a photoelectric receiving tube (71), and the photoelectric receiving tube (71) is positioned on the focal plane of the converging lens (12); the side wall of the detection pipeline (3) is provided with a detection hole (31), a lens protection device is arranged between the detection hole (31) and the photoelectric detection unit, the lens protection device is composed of an inserting sheet fixing seat (5) and a protection inserting sheet (9), the inserting sheet fixing seat (5) is provided with a transverse light through hole (51) and a longitudinal inserting sheet hole (52), one end of the transverse light through hole (51) is in butt joint with the detection hole (31), and the other end of the transverse light through hole is in butt joint with a lens mounting port (63) on the photoelectric plate fixing seat (6); the protection inserting sheet (9) is inserted into the longitudinal inserting sheet hole (52) to cut off the transverse light through hole (51), the protection inserting sheet (9) is provided with a glass mounting opening (90), the left side of the glass mounting opening (90) is provided with protection glass (91), and the protection glass (91) is opposite to the transverse light through hole (51);
the platform also comprises a photoelectric detection reference unit (10), wherein a reference unit mounting port is formed in the side wall of the cavity (61), and the photoelectric detection reference unit (10) is arranged on the reference unit mounting port;
the air chamber pipeline (2) is connected with the detection pipeline (3) through a connecting seat (8), and the detection pipelines (3) at two sides are of an asymmetric structure;
the air chamber pipeline (2) adopts a bending structure, and the outlet of the air chamber pipeline (2) is obliquely arranged on the flue gas inlet of the detection pipeline (3).
2. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: the photoelectric plate fixing seat (6) is fixedly arranged on the inserting sheet fixing seat (5) through bolts, and the inserting sheet fixing seat (5) is connected with the detection pipeline (3) through bolts.
3. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: a first sealing ring (13) is arranged at the joint of the transverse light through hole (51) and the lens mounting opening (63).
4. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: the right side of the glass mounting opening (90) is provided with a second sealing ring (92), and the second sealing ring (92) seals a gap between the protection inserting sheet (9) and the longitudinal inserting sheet hole (52).
5. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: a bolt connection port is arranged between the photoelectric plate fixing seat (6) and a circuit board of the photoelectric detection unit, the circuit board of the photoelectric detection unit is provided with an external connection joint, and the photoelectric plate fixing seat is directly connected to an external driving and processing control unit.
6. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: the air inlet of the detection pipeline (3) is respectively connected with the fan (4), and the air chamber pipeline (2) is connected with the flue gas inlet of the detection pipeline (3).
7. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: the outside of the air chamber pipeline (2) is provided with a heating device (15), and the heating device (15) is fixed on two sides of the air chamber pipeline (2) by adopting two heating belts with direct current power supply.
8. The lens-protected optical bench of a transmission smoke meter according to claim 1, wherein: the middle part of the air chamber pipeline (2) is fixed with a fixed plate through a screw, the fixed plate is inserted into the open slot, and the fixed plate is provided with a flue gas inlet pipe (1); the flue gas inlet pipe (1) adopts a structure with a bending angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755750.XA CN104458524B (en) | 2014-12-10 | 2014-12-10 | Optical platform of transmission type smoke meter with lens protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755750.XA CN104458524B (en) | 2014-12-10 | 2014-12-10 | Optical platform of transmission type smoke meter with lens protection |
Publications (2)
| Publication Number | Publication Date |
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| CN104458524A CN104458524A (en) | 2015-03-25 |
| CN104458524B true CN104458524B (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410755750.XA Active CN104458524B (en) | 2014-12-10 | 2014-12-10 | Optical platform of transmission type smoke meter with lens protection |
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Citations (9)
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| CN1373919A (en) * | 1998-12-16 | 2002-10-09 | 塞尔机器人技术有限公司 | Apparatus and method for protecting components of light source |
| DE20300037U1 (en) * | 2003-01-03 | 2003-05-08 | Kress Juergen | Protection device against contamination for medical endoscopes |
| CN2840025Y (en) * | 2005-10-31 | 2006-11-22 | 天津市圣威科技发展有限公司 | Light-proof smokemeter |
| CN2911667Y (en) * | 2006-06-02 | 2007-06-13 | 安徽蓝盾光电子股份有限公司 | Measuring probe of monitor for on-line detecting flue gas |
| CN101500472A (en) * | 2006-07-21 | 2009-08-05 | 昂科斯科公司 | Protective probe tip, particularly for use on a fiber-optic probe used in an endoscopic application |
| CN101855589A (en) * | 2007-09-14 | 2010-10-06 | 埃西勒国际通用光学公司 | Method for preparing the surface of a lens including an anti-soiling coating for edging the same |
| JP2010271545A (en) * | 2009-05-21 | 2010-12-02 | Tdk Taiwan Corp | Lens protection structure of lens focus driving device |
| CN103411865A (en) * | 2013-08-09 | 2013-11-27 | 浙江浙大鸣泉科技有限公司 | Optical table of transmission-type smokemeter |
| CN104010458A (en) * | 2013-02-25 | 2014-08-27 | 摩托罗拉移动有限责任公司 | Electronic Device Having a Display and Method of Manufacture |
-
2014
- 2014-12-10 CN CN201410755750.XA patent/CN104458524B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373919A (en) * | 1998-12-16 | 2002-10-09 | 塞尔机器人技术有限公司 | Apparatus and method for protecting components of light source |
| DE20300037U1 (en) * | 2003-01-03 | 2003-05-08 | Kress Juergen | Protection device against contamination for medical endoscopes |
| CN2840025Y (en) * | 2005-10-31 | 2006-11-22 | 天津市圣威科技发展有限公司 | Light-proof smokemeter |
| CN2911667Y (en) * | 2006-06-02 | 2007-06-13 | 安徽蓝盾光电子股份有限公司 | Measuring probe of monitor for on-line detecting flue gas |
| CN101500472A (en) * | 2006-07-21 | 2009-08-05 | 昂科斯科公司 | Protective probe tip, particularly for use on a fiber-optic probe used in an endoscopic application |
| CN101855589A (en) * | 2007-09-14 | 2010-10-06 | 埃西勒国际通用光学公司 | Method for preparing the surface of a lens including an anti-soiling coating for edging the same |
| JP2010271545A (en) * | 2009-05-21 | 2010-12-02 | Tdk Taiwan Corp | Lens protection structure of lens focus driving device |
| CN104010458A (en) * | 2013-02-25 | 2014-08-27 | 摩托罗拉移动有限责任公司 | Electronic Device Having a Display and Method of Manufacture |
| CN103411865A (en) * | 2013-08-09 | 2013-11-27 | 浙江浙大鸣泉科技有限公司 | Optical table of transmission-type smokemeter |
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