CN201795990U - Air channel system for measuring smoke intensity of tail gas of diesel vehicle - Google Patents

Air channel system for measuring smoke intensity of tail gas of diesel vehicle Download PDF

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Publication number
CN201795990U
CN201795990U CN2010205264484U CN201020526448U CN201795990U CN 201795990 U CN201795990 U CN 201795990U CN 2010205264484 U CN2010205264484 U CN 2010205264484U CN 201020526448 U CN201020526448 U CN 201020526448U CN 201795990 U CN201795990 U CN 201795990U
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China
Prior art keywords
air
tail gas
channel system
diesel vehicle
exhaust gas
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Expired - Lifetime
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CN2010205264484U
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Chinese (zh)
Inventor
李虹杰
井传发
陈力
潘启俊
李建新
李立
朱战军
胡婷婷
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Wuhan Tianhong Instruments Co Ltd
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Wuhan Tianhong Instruments Co Ltd
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Abstract

The utility model relates to the technical field of environment monitoring equipment, in particular to an air channel system for measuring the smoke intensity of tail gas of a diesel vehicle. The system comprises a sampling system, a double-air curtain room and an air cleaning system, wherein the sampling system comprises a sampling head, a sampling pipeline, a constant flow pump, a throttle and an air current converting electromagnetic valve which are sequentially connected with each other for sampling the tail gas; the double-air curtain room consists of a main air curtain passageway formed by an axial fan and a lens room air curtain passageway formed by positive pressure cleaning gas; and the air cleaning system comprises an air cleaning device, an air pump and an air cleaning pipeline which are sequentially connected with each other for cleaning an optical system and cleaning a light measuring passageway when the equipment is not used for measuring. The tail gas is pumped into a smoke intensity measuring unit by the constant flow pump, so that the air channel system guarantees that the tail gas can be transported in a longer distance, realizes the on-line measurement of the smoke intensity; due to the throttle, the air channel system guarantees the stability of the flow of the tail gas, and guarantees the precise measurement of the smoke intensity; and due to the air cleaning system, the air channel system guarantees the cleanliness of the optical system, and improves the accuracy of measurement.

Description

The air-channel system of exhaust gas from diesel vehicle smoke measurement
Technical field
The utility model relates to the environment supervision instrument technical field, relates in particular to the technical field of exhaust gas from diesel vehicle smoke measurement.
Background technology
Motor vehicle bring great convenience for people's live and work, but the tail gas that motor vehicle emitted has also become the another source of atmospheric pollution except that air pollution due to coal combustion as one of most important vehicles of modern society.Corresponding, pollutant discharging total of motor vehicle is in rapid rising.Each big city, the whole nation is subjected to tail gas pollution of motor-driven vehicle serious.By being detected, tail gas pollution of motor-driven vehicle protect environment for human survival just significant.
Along with the increase and the raising of people's environmental consciousness of motor vehicles, China has formulated seriation national standards such as GB3842-83, GB7258-87, GB1495-79 respectively with regard to toxic emission, smoke intensity and noise.Therefore, all kinds of automobile exhaust analyzers, smoke intensity detector and sound meter have entered each province, city, measuring station at county level, and also have been imperative as the indispensable instrument of one, two class Automobile Service Factories.
At present, the monitoring of exhaust gas from diesel vehicle has only solved the emission level of the exhaust gas from diesel vehicle under the rated condition, and it is just powerless to monitor diesel vehicle emission behaviour in the process of moving in real time.Diesel vehicle in the process of moving because the environment more complicated on road surface, the emission behaviour of tail gas is subjected to all multifactor influences, therefore, emission behaviour is very complicated.Because the existence of sampling problem, exhaust emissions can not be monitored always in real time.The technology that real-time online is sampled to the discharging of diesel vehicle engine yet there are no report.
The utility model content
The technical problems to be solved in the utility model is: the real-time monitoring problem of diesel vehicle exhaust gas smoke discharging in the process of moving.
The technical solution of the utility model is: a kind of air-channel system of exhaust gas from diesel vehicle smoke measurement comprises sampling system, two air curtains chamber and pure air system;
Sampling system comprises that sampling head, sampling conduit, constant flow pump, the gentle stream translation solenoid valve of throttling valve connect collection tail gas successively; Tail gas flows into the measuring light passage in the light obscuration smokemetor through the air-flow conversion electromagnetic valve then, and after measurement finished, tail gas flowed into the main air curtain passage in the light obscuration smokemetor, discharges outside the car by exhausr port;
Two air curtains chamber, the i.e. main air curtain passage that forms by aerofoil fan and the malleation clean gas of lens chamber;
Pure air system: comprise air purifier, aspiration pump and purification pump-line; The pure air system carries out purified treatment with common air, by aspiration pump suction lens chamber, is used for clean optical system; When instrument was in non-measurement state, aspiration pump by conversion electromagnetic valve suction optical channel chamber, was used for clean optical channel simultaneously with pure air.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its light obscuration smokemetor comprise light source, measuring light passage, collimation lens, receiver lens, eliminate stray light grid (light Lan) design and photoelectricity receiving chamber; The measuring light channel temperature is controlled at 60 and spends to 90 degree, to reduce condensing of steam.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its pair air curtain chamber is positioned at measuring light passage both sides, at collimation lens, accepts between lens and the optical channel, to guarantee that tail gas does not pollute optical element.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its exhaust ports is equipped with off-gas pump will measure the tail gas discharge.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its sampling conduit adopt the special material that does not glue oil smoke to make; According to the amblent air temperature difference of using, water back and two kinds of water backs are not arranged; The sampling conduit material is metal, teflon; The sampling conduit diameter is Φ 2mm-Φ 60mm.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, the sampling head of its sampling system directly insert from the automobile exhaust pipe afterbody.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, it inserts sampling head in the middle part perforate of vehicle exhaust gas exhaust duct.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its any part between gas exhaust duct afterbody and engine adds a coupling arrangement, and sampling head is put into coupling arrangement.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its sampling head insertion depth is not less than 400mm, and makes sampling head be parallel to gas outlet; The fixedly connected mode of sampling head is welding, flange, lock ring; Sampling head adopts 4 uniform blades, and adopts exotic material.
Preferably, the air-channel system of aforesaid exhaust gas from diesel vehicle smoke measurement, its pure air system adopts screen pack and air cleaner, produces pure air.
The beneficial effects of the utility model are: comprehensive optimal design of the utility model gaseous fluid, form a cover complete, optimize, be applicable to the sampling system of exhaust gas from diesel vehicle smoke measurement.This systematic sampling is accurately stable, and good reproducibility is safe and reliable.It is the desirable sampling system of exhaust gas from diesel vehicle emission monitoring.
Specifically, the utility model brings following advantage to the improvement of structure:
(1) above-mentioned sampling head adopts 4 uniform blades, guarantees that sampling head is positioned at the gas outlet center; Adopt exotic material, satisfy the requirement of gas outlet hot environment.
(2) sampling conduit adopts the special material that does not glue oil smoke to make.According to the amblent air temperature difference of using, water back and two kinds of water backs are not arranged.
(3) adopt the measuring unit of constant flow pump, guarantee the longer Distance Transmission of tail gas, for the on-line measurement of smoke intensity is given security with tail gas suction smoke intensity instrument.
(4) adopt throttling valve, guarantee the stable of exhaust flow, guarantee the precision measurement of smoke intensity.
(5) adopt the pure air system, guarantee the cleaning of optical system, improve the accuracy of measuring.
Description of drawings
Fig. 1 is the smoke measurement schematic diagram of the utility model embodiment.
Fig. 2 is air-channel system embodiment one synoptic diagram of the utility model embodiment.
Fig. 3 is air-channel system embodiment two synoptic diagram of the utility model embodiment.
Fig. 4 is two air curtain cell structure synoptic diagram of the utility model embodiment.
The explanation of mark: 1 light source, 2 light-sensitive cells, 3 collimation lenses, 4 accept lens, 5,6 eliminate stray light grid (light Lan), 7 measuring light passages, 8 tail gas, 9 sampling heads, 10 sampling conduits, 11 constant flow pumps, 12 throttling valve, 13 air-flow conversion electromagnetic valves, 14 aspiration pumps, 15 purify air, 16 pipelines that purify air, 17 main air curtain pipelines, 18 aerofoil fans, 19 exhausr ports, 20 air purifiers, 21 tail gas extraction fans, 22 auxiliary scavenger systems, 23 main exhaust pipelines.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model and being implemented, but illustrated embodiment is not as to qualification of the present utility model.
Fig. 1 is the schematic diagram of the utility model embodiment smoke measurement.Smoke measurement adopts the diesel engine smoke intensity light obscuration method of testing of national regulation.It is according to Lambert-Beer's law, utilizes tail gas that the principle of light absorption is measured the smoke intensity value of tail gas, comprising: coefficient of light absorption K value and luminous absorptance N.Light source 1 adopts long-life LED lamp, and luminous predominant wavelength is at 560nm.Light-receiving adopts the light-sensitive cell 2 of the luminosity function that meets human eye to carry out opto-electronic conversion.Collimation lens 3 and the optical design of accepting lens 4 employing symmetrical structures are convenient to reduce cost and the system debug requirement.The design of Sealing Structure of two lens guarantees the cleaning of light source chamber and photoelectricity receiving chamber.Two eliminate stray light grid (light Lan) 5,6 guarantee that parasitic light can not enter the system of acceptance, thereby guarantee the accuracy of test data; In the measuring light passage 7, the blackout oxidation processes on the trench design of equidistant screw thread-like and surface makes that parasitic light is effectively absorbed, and improves the beam quality of system; Optical channel length adopts half the design of national standard length, is convenient to reduce the instrument volume, complies with the national standard requirements simultaneously.Anti-electromagnetic interference (EMI) design of system and anti-vibration design improve the instrument overall performance greatly.The calibration slot of basic filter (instrument verification plate socket) is convenient to the correction of instrument.Carry out data processing by CPU, calculate coefficient of light absorption K value and luminous absorptance N at last.Instrument meets JJG976-2002 " transmission-type smokemetor vertification regulation " requirement.The passage length of standard light shown in Fig. 1 is 215mm.
Fig. 2 is air-channel system embodiment one synoptic diagram of the utility model embodiment.When smoke measurement, tail gas 8, by inserting the sampling head 9 of the exhaust pipe of engine, extracted out by constant flow pump 11, the tail gas of extraction is by behind throttling valve 12 regime flows, through air-flow conversion electromagnetic valve 13, flow into measuring light passage 7, after measurement finished, tail gas stream was become owner of air curtain pipeline 17, by about exhausr port 19 discharge outside the cars.
The air that the process air purifier 20 of native system purifies is drawn into collimation lens 3 and the lens chamber of accepting lens 4 places by the pipeline 16 that purifies air with pure air by independently aspiration pump 14 extractions, forms auxiliary air curtain at lens chamber.When being in non-measurement state, air-flow conversion electromagnetic valve 13 is closed exhaust gas channel, connects the pipeline that purifies air simultaneously, and aspiration pump 14 is with pure air suction measuring light passage 7, pipe blow-through.
Fig. 3 is air-channel system embodiment two synoptic diagram of the utility model embodiment.When smoke measurement, vehicle exhaust 8 by inserting the sampling head 9 of the exhaust pipe of engine, is extracted out by constant flow pump 11, the tail gas of extracting out is by behind throttling valve 12 regime flows, through air-flow conversion electromagnetic valve 13, flow into measuring light passage 7, after measurement finishes, tail gas stream is become owner of air curtain pipeline 17, and converge to the exhaust passage, by tail gas extraction fan 21, discharge outside the car by exhausr port 19.
The air that the process air purifier 20 of native system purifies is drawn into collimation lens 3 and the lens chamber of accepting lens 4 places by the pipeline 16 that purifies air with pure air by independently aspiration pump 14 extractions, forms auxiliary air curtain at lens chamber.When being in non-measurement state, air-flow conversion electromagnetic valve 13 connects the pipeline that purifies air simultaneously with the vehicle exhaust pathway closure, and aspiration pump 14 is with pure air suction measuring light passage 7, pipe blow-through.
As follows aspect the improvement of structure:
(1) above-mentioned sampling head 9 adopts 4 uniform blades, guarantees that sampling head 9 is positioned at the gas outlet center; Adopt exotic material, satisfy the requirement of gas outlet hot environment.Sampling head 9 has three kinds of modes to insert automobile exhaust pipeline: directly insert from the automobile exhaust pipe afterbody; Insert sampling head 1 in punching back, gas outlet middle part, and make sampling head 9 parallel tracheaes; Any part adds a coupling arrangement between gas exhaust duct afterbody and engine, and sampling head 1 is put into coupling arrangement.Sampling head 1 insertion depth is not less than 400mm.Sampling head 9 fixedly connected modes are welding, flange, lock ring.
(2) sampling conduit 10 adopts the special material that does not glue oil smoke to make.According to the amblent air temperature difference of using, water back and two kinds of water backs are not arranged; The sampling conduit material is metal, teflon; The sampling conduit diameter is Φ 2mm-Φ 60mm.
(3) adopt the measuring unit of constant flow pump 11, guarantee the longer Distance Transmission of tail gas, for the on-line measurement of smoke intensity is given security with tail gas suction smoke intensity instrument.
(4) adopt throttling valve 12, guarantee the stable of exhaust flow, guarantee the precision measurement of smoke intensity.
(5) adopt 13 controls of air-flow conversion electromagnetic valve, can when instrument be in non-measurement state, gas circuit be transformed into pure air flow into state, clean the measuring light passage with pure air.Guarantee the accurate of zero correction.
When carrying out smoke measurement, workflow is as follows: the instrument start, and air-flow conversion electromagnetic valve 13 is closed, and instrument carries out automatic zero adjustment, after school zero finishes.Led light source 1 extinguishes, and instrument begins the school mark.Behind the mark of instrument school, begin normal surveying work.Tail gas passes through sampling system, enter measuring light passage 7, because the existence of tail gas, make light light intensity attenuation before entering light-sensitive cell 2 that led light source 1 sends, light signal changes, system passes through to calculate these variable quantities, thereby draws the coefficient of light absorption K value and the luminous absorptance N of tail gas, finishes the measurement of smoke intensity value.
Fig. 4 is two air curtain cell structure synoptic diagram of the utility model embodiment.Main exhaust pipeline 23 is discharged all tail gas by aerofoil fan 18, in order to reduce remaining tail gas from entering collimation lens 3 and the lens chamber of accepting lens 4 places; On lens chamber, add an auxiliary scavenger system 22, have pure air to be blown into lens chamber, make lens chamber form an auxiliary air curtain, when measuring, guarantee that tail gas can not enter lens chamber and pollute lens, on the other hand on the one hand, at non-measurement state, clean lens.Two air curtains chamber is positioned at measuring light passage 7 both sides, at collimation lens 3, accept between lens 4 and the optical channel 7.To guarantee that tail gas does not pollute optical element.The measuring light channel temperature is controlled at 60 and spends to 90 degree (preferably 75 degree), to reduce condensing of steam.
The wherein said pair of air curtain comprises the main air curtain that formed by two aerofoil fan 18 air draft pipes and the malleation clean gas of lens chamber.A macropore of design is convenient to the eliminating of tail gas on main exhaust pipeline 23, and an aperture plays two effects simultaneously: one is to stop tail gas to enter lens chamber; The 2nd, play grating (light Lan) effect of optical system, restriction parasitic light, i.e. eliminate stray light grid (light Lan) 5,6.
The above embodiment is the preferred embodiment that proves absolutely that the utility model is lifted, and protection domain of the present utility model is not limited thereto.Being equal to that those skilled in the art are done on the utility model basis substitutes or conversion, all within protection domain of the present utility model.Protection domain of the present utility model is as the criterion with claims.

Claims (10)

1. the air-channel system of an exhaust gas from diesel vehicle smoke measurement, it is characterized in that: this air-channel system comprises sampling system, two air curtains chamber and pure air system;
Described sampling system, comprise sampling head, sampling conduit, constant flow pump, the gentle stream translation solenoid valve of throttling valve, connect successively, be used to gather tail gas, tail gas flows into the measuring light passage in the light obscuration smokemetor through the air-flow conversion electromagnetic valve, after measurement finishes, tail gas flows into the main air curtain passage in the light obscuration smokemetor, discharges outside the car by exhausr port;
Described pair of air curtain chamber, i.e. the lens chamber air curtain passage that forms of main air curtain passage that forms by aerofoil fan and malleation clean gas;
Described pure air system: comprise air purifier, aspiration pump and the pipeline that purifies air, connect successively, after being used for common air carried out purified treatment,, come clean optical system by aspiration pump suction lens chamber; When instrument was in non-measurement state, aspiration pump by conversion electromagnetic valve suction measuring light passage, was used for clean measuring light passage simultaneously with pure air.
2. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: described light obscuration smokemetor comprises light source, measuring light passage, collimation lens, receiver lens, eliminate stray light grid and photoelectricity receiving chamber; Described measuring light channel temperature is controlled at 60 and spends to 90 degree, to reduce condensing of steam.
3. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 2 is characterized in that: described pair of air curtain chamber is positioned at measuring light passage both sides, at collimation lens, accepts between lens and the measuring light passage, to guarantee that tail gas does not pollute optical element.
4. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: described exhaust ports is equipped with off-gas pump discharges the tail gas that measures.
5. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: described sampling conduit adopts the metal or the polytetrafluoroethylmaterial material that do not glue oil smoke not to make; According to the amblent air temperature difference of using, described sampling conduit has water back and two kinds of water backs not; Described sampling conduit diameter is that 2mm is to 60mm.
6. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: the sampling head of described sampling system directly inserts from the exhaust pipe afterbody.
7. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: described sampling head inserts after the middle part perforate of exhaust pipe road.
8. according to the air-channel system of claim 6 or 7 described exhaust gas from diesel vehicle smoke measurements, it is characterized in that: described sampling head inserts the exhaust pipe road degree of depth and is not less than 400mm, and makes described sampling head be parallel to the exhaust pipe road; Described sampling head adopts the fixedly connected mode of welding, flange or lock ring; Described sampling head adopts 4 uniform blades, and adopts exotic material.
9. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: any part adds a coupling arrangement between exhaust pipe road afterbody and engine, and described sampling head is put into coupling arrangement.
10. the air-channel system of exhaust gas from diesel vehicle smoke measurement according to claim 1 is characterized in that: described pure air system's employing screen pack and air cleaner produce pure air.
CN2010205264484U 2010-09-13 2010-09-13 Air channel system for measuring smoke intensity of tail gas of diesel vehicle Expired - Lifetime CN201795990U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101949788A (en) * 2010-09-13 2011-01-19 武汉市天虹仪表有限责任公司 Gas circuit system for measuring tail gas smoke intensity of diesel vehicle
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
CN103424286A (en) * 2012-05-23 2013-12-04 Avl北美股份有限公司 Exhaust sampling system and method for water vapor management
WO2019201449A1 (en) * 2018-04-20 2019-10-24 Flo2R Aps Gas analyser system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101949788A (en) * 2010-09-13 2011-01-19 武汉市天虹仪表有限责任公司 Gas circuit system for measuring tail gas smoke intensity of diesel vehicle
CN103424286A (en) * 2012-05-23 2013-12-04 Avl北美股份有限公司 Exhaust sampling system and method for water vapor management
CN103424286B (en) * 2012-05-23 2017-09-22 Avl 测试系统公司 The exhaust sampling system and method managed for vapor
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
CN103411865B (en) * 2013-08-09 2015-11-18 浙江浙大鸣泉科技有限公司 A kind of optical table of transmission-type smoke meter
WO2019201449A1 (en) * 2018-04-20 2019-10-24 Flo2R Aps Gas analyser system
US11442005B2 (en) 2018-04-20 2022-09-13 Flo2R Aps Gas analyser system

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Granted publication date: 20110413

Effective date of abandoning: 20120509