CN104525011B - A kind of dynamic gas distribution instrument and air distributing method - Google Patents
A kind of dynamic gas distribution instrument and air distributing method Download PDFInfo
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- CN104525011B CN104525011B CN201410843871.XA CN201410843871A CN104525011B CN 104525011 B CN104525011 B CN 104525011B CN 201410843871 A CN201410843871 A CN 201410843871A CN 104525011 B CN104525011 B CN 104525011B
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Abstract
The present invention relates to gas detecting instrument field, particularly relate to a kind of dynamic gas distribution instrument and air distributing method.This distributing instrument includes unstripped gas path, carrier gas path and mixing duct, described unstripped gas path all connects with described mixing duct with carrier gas path, described unstripped gas path is provided with first flow controller, described carrier gas path is provided with second flow controller, and described second flow controller is connected with described first flow controller and mixing duct respectively by a control valve.This distributing instrument simple in construction, controllability is good, air distributing method is simple, by using this distributing instrument can realize first flow controller and the automatically cleaning of second flow controller and self-calibration function, improve precision and the air distribution efficiency of joined target gas, corrosion resistance is good, is conducive to safeguarding equipment, the access leg parallel connection of the most several unstripped gas accesses, can be according to different demand proportioning corresponding target gas.
Description
Technical field
The present invention relates to gas detecting instrument field, particularly relate to a kind of dynamic gas distribution instrument and distribution
Method.
Background technology
In gas detection analyzer device, often need the mark using distributing instrument to obtain variable concentrations
Quasi-gas carries out demarcation etc. to instrument, at present, along with gas concentration is examined by field of industry detection
The requirement surveying accuracy is increasingly tighter, improves the concentration requirement of calibrating gas the most therewith.Market
The upper the most frequently used method obtaining variable concentrations calibrating gas utilizes mass flow mixing method exactly,
I.e. by utilizing a dilution air flow amount controller and one or above flow of feed gas amount controller
Unstripped gas is carried out dilution proportion, to obtain aimed concn.Therefore, determine that calibrating gas is dense
The mass flow controller precision of degree becomes the problem that current preference considers, simultaneously also to high efficiency
The proportioning realizing normal concentration proposes higher expectation.
Such as, the application for a patent for invention of Application No. 201110393886.7 discloses a kind of standard
Gas distributing instrument, its design exists that following some is not enough: 1, have employed cooling piece, heating plate and/or
Heating rod, adopt the temperature temperature control material such as device, and insulation material etc. so that the structure of complete machine is multiple
Miscellaneous, trouble point is many and not easy care；2. when output in the outside output pipe of distributing instrument and heat-insulation layer
When pipeline has the bigger temperature difference, the precision of the matched proportion density of target gas can be produced certain impact.And
The application for a patent for invention of Application No. 201210277728.X disclose a kind of data calibration method and
Device, the flow control accuracy of single flow controller is simply calibrated, is not examined by it
Consider the precision difference between carrier gas and flow of feed gas amount controller.It addition, from existing public technology
From the point of view of, all do not consider that flow of feed gas amount controller is when the sour gas of Long Term Contact higher concentration
The corrosion condition to a certain extent occurred.
Therefore, for above not enough, the invention provides a kind of high-precision dynamic gas distribution instrument and
Air distributing method.
Summary of the invention
(1) to solve the technical problem that
It is an object of the invention to provide a kind of distributing instrument and air distributing method to solve existing air distributing device
The structure existed is complicated, and deviation accumulation is big, and distribution precision is low, and controlling is poor, corrosion-prone asks
Topic.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of dynamic gas distribution instrument and distribution side
Method, this dynamic gas distribution instrument includes unstripped gas path, carrier gas path and mixing duct, described former
Material gas path all connects with described mixing duct with carrier gas path, and described unstripped gas path sets
First flow controller, described carrier gas path is had to be provided with second flow controller, described
Two flow controllers by control valve respectively with described first flow controller and mixing duct
Connect.
Wherein, the entrance of described first flow controller is parallel with some unstripped gas access leg,
It is equipped with electromagnetic valve on every branch road of described some unstripped gas access leg, corresponding in order to control
Unstripped gas be passed through described first flow controller.
Wherein, a described control valve is the three-way valve into scene 2, its import and described second
Flow controller connects, and outlet connects described first flow controller and mixed pipe line respectively.
Or, a described control valve is two two-position two-way solenoid valve compositions, described second
Amount controller is connected with described mixing duct by one of them two-position two-way solenoid valve, and described the
Two flow controllers are by another two-position two-way solenoid valve with described first flow controller even
Connect.
Wherein, described mixing duct is two to enter a tee T out, and two import connects respectively
Described unstripped gas path and carrier gas path, export as target gas gas outlet.
Wherein, described first flow controller and second flow controller all use laminar flow differential pressure type
The flow controller of measuring principle, all carries temperature and pressure and compensates inside it.
Wherein, described unstripped gas path is provided with a three-way valve entering scene 2, its import and first
Flow controller connects, and one of them outlet connects described mixing duct, and another outlet is aerofluxus
Mouthful.
Present invention also offers the distribution side that a kind of dynamic gas distribution instrument using above scheme is carried out
Method, and include following procedure:
Calculate initial flow, according to unstripped gas concentration S1, target gas concentration C1Always flow with target gas
The parameters such as amount, the flow calculating required carrier gas is N1, the flow of unstripped gas is G1。
Self-cleaning program, closes the access of described unstripped gas, connects a described control valve, dilute
Outgassing circulates along described second flow controller, a control valve and first flow controller successively,
Carry out automatically cleaning.
Self-calibration routines, the flow arranging described second flow controller is full scale N, arranges
The flow N of first flow controller1, wherein, N1Less than N, carrier gas presses above-mentioned automatically cleaning journey
The path circulation of sequence, after described first flow controller and second flow controller indicating value are stablized,
The flow indicating value of record second flow controller is N2, N2With N1Linear fit correlation.
Mixing distribution program, after described self-calibration routines, controls described first flow controller
Controlled quentity controlled variable be G1, the controlled quentity controlled variable controlling described second measuring device is N2, unstripped gas is by described
First flow controller, enters in described mixed pipe line, and carrier gas passes sequentially through described second
Amount controller and a control valve, enter in described mixed pipe line, and described unstripped gas is dilute with described
Outgassing mixes, and obtains target gas, by N1/G1It is proportional to S1/C1Relation calculate can obtain target
Gas concentration C1。
(3) beneficial effect
The technique scheme of the present invention has the advantage that the dynamic gas distribution instrument that the present invention provides
Including unstripped gas path, carrier gas path and mixing duct, described unstripped gas path and carrier gas
Path all connects with described mixing duct, and described unstripped gas path is provided with first flow control
Device, described carrier gas path is provided with second flow controller, and described second flow controller leads to
Cross a control valve to be connected with described first flow controller and mixing duct respectively.By former
Material gas path and carrier gas path on be respectively provided with flow controller, can each control on demand former
Material gas and the mass flow of carrier gas, thus it is passed in mixed pipe line configuration object gas, logical
Cross and a control valve is set, two flow controllers can be connected, two flow controllers can be made
Control each other, it is achieved self calibration, reduce error, improve precision, moreover it is possible to make two flows
Controller realizes self-cleaning function simultaneously, this distributing instrument simple in construction, and controlling is high；Use this
The distributing instrument of invention is joined by calculating initial flow, self-cleaning program, self-calibration routines and mixing
The program of gas, realizes flow controls calibration and the calibration to precision of fuzzy controller simultaneously, and this is joined
Gas program is simple, and the target gas precision obtained is higher, makes distributing instrument obtain effectively simultaneously
Cleaning.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of dynamic gas distribution instrument of the present invention；
Fig. 2 is the gas flow access diagram of automatically cleaning and self-calibration routines in Fig. 1；
Fig. 3 is the gas flow access diagram mixing distribution program in Fig. 1.
In figure, 1: unstripped gas；2: carrier gas；3: electromagnetic valve；4: numbers control valves；5
First flow controller；6: second flow controller；7: No. two control valves；8: mixing tube
Road；Wherein, arrow show airflow direction.
Detailed description of the invention
Make to retouch the most in detail to the detailed description of the invention of the present invention with embodiment below in conjunction with the accompanying drawings
State.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
As it is shown in figure 1, a kind of dynamic gas distribution instrument that the present invention provides, it is characterised in that include
Unstripped gas path, carrier gas path and mixing duct 8, unstripped gas path and carrier gas path are equal
Connecting with mixing duct 8, unstripped gas path is provided with first flow controller 5, states carrier gas
Path is provided with second flow controller 6, and second flow controller 6 is by the first control valve 4
It is connected with first flow controller 5 and mixing duct 8 respectively.
As it is shown in figure 1, the entrance of first flow controller 5 is parallel with the access of some unstripped gas
Road, every branch road of some unstripped gas access leg is equipped with electromagnetic valve 3, during use, according to
Unstripped gas 1 needed for the needs connection of target gas, controls the access of different material gas by electromagnetic valve
The break-make on road controls the break-make situation of corresponding unstripped gas 1, can realize the proportioning of different target gas.
In the present embodiment, a control valve 4 uses a three-way valve entering scene 2, its import and the
Two flow controllers 6 connect, and outlet connects first flow controller 5 and mixed pipe line 8 respectively,
So, different path situations can be switched flexibly by the effect of a control valve 4.Or,
In being embodied as, a control valve 4 can also use the electromagnetic valve of two bi-bit bi-pass, wherein
One electromagnetic valve in order to connect first flow controller 5 and second flow controller 8, another
Electromagnetic valve, in order to connect second flow controller 6 and mixing duct 8, so can also realize
Same effect.
As it is shown in figure 1, mixing duct 8 is two to enter a tee T out, two import is respectively
Connection unstripped gas path and carrier gas path, export as target gas gas outlet.Pass through mixing duct
The effect of 8, by unstripped gas 1 and carrier gas 2 mixed on demand, is met the target gas of requirement.
In the present invention, first flow controller 5 and second flow controller 6 all use laminar flow poor
The flow controller of pressure type measuring principle, all carries temperature and pressure and compensates inside it.So letter
Change distributing instrument structure, be not required to additionally arrange temperature regulating device and pressure compensator etc., can make
Within the temperature range of in whole pipeline, the temperature of gas remains at a relative constancy, reduce
Ambient temperature is to the interference caused by distribution, thus stability when improving distribution.
As it is shown in figure 1, unstripped gas path is provided with a three-way valve 7 entering scene 2, its import with
First flow controller 5 connects, and one of them outlet connects mixing duct 8, and another outlet is
Air vent.So, when two controllers only need to be cleaned, by three-way valve 7 and mixing duct 8
Path close, cleaning gas is discharged from the air vent of three-way valve can meet cleaning requirement, and works as
When needing together with cleaning mixed pipe line, three-way valve 7 can be closed, make cleaning gas from mixing duct 8
Gas outlet discharge.
When using the distributing instrument distribution of the present invention, first, instrument is started, according to unstripped gas concentration
S1, target gas concentration C1With parameters such as target gas total flows, it is calculated the stream of required carrier gas
Amount is N1, the flow of unstripped gas is G1。
Self-cleaning program, closes the corresponding electromagnetic valve 3 of unstripped gas 1, controls a control valve 4,
Gas flow passage as shown in Figure 2, carrier gas 2 is successively along second flow controller 6,
Control valve 4 and first flow controller 5 circulate, and each equipment is carried out automatically cleaning, in this program
In, carrier gas 2 can flow directly into mixing duct 8 row of being cleaned from first flow controller 5
Go out, it is possible to the air vent of No. two control valves 7 by arranging is discharged.In specifically used, from clear
Clean program can start the most flexibly when any needs.
Self-calibration routines, gas flow path as shown in Figure 2, by controlling two flow controls
Device processed and control valve, can realize the mutual self-calibration routines of controller, reduces distribution error.Behaviour
When making, the controlled quentity controlled variable arranging second flow controller 6 is full scale N, arranges first flow control
The flow N of device 5 processed1, wherein, N1Less than N, carrier gas 2 path stream as shown in Figure 2
Logical, after first flow controller 5 and second flow controller 6 indicating value are stablized, record second
The flow indicating value of flow controller 6 is N2, N2With N1Linear fit correlation, so passes through
First flow controller 5 controls the flow of second flow controller 6, utilizes controlled quentity controlled variable N1With
N2Proportionate relationship, it is achieved self-calibration routines.During concrete operations, calibration procedure can also lead to
Cross second flow controller 6 to control the flow of first flow controller 5, realize second
The amount controller 6 anti-calibration to first flow controller 5, similar, only need to be by first flow
The controlled quentity controlled variable of controller 5 is set to full scale N, and the flow arranging second flow controller is
G1, calibrate with aforementioned similar carrying out.
Mixing distribution program, gas flow passage as shown in Figure 3, after the calibration routine, disconnected
Open the path of a control valve 4 and first flow controller 5, control first flow controller 5
Controlled quentity controlled variable be G1, the controlled quentity controlled variable simultaneously controlling second flow controller 6 is N2, unstripped gas 1
By first flow controller 5 and No. two control valves 7, enter in mixed pipe line 8, carrier gas 2
Pass sequentially through second flow controller 6 and a control valve 4, enter in mixed pipe line 8, raw material
Gas 1 mixes with carrier gas 2, obtains target gas, by N1/G1It is proportional to S1/C1Relation calculate
Target gas concentration C can be obtained1。
It should be noted that the unstripped gas of the dynamic gas distribution instrument of the present invention uses the side of multi-channel parallel
Formula accesses in corresponding first flow controller, can on-demand configuration one-component target gas, it is possible to
Corresponding flow controller is increased, in order to control unstripped gas, it is thus possible to realize many components to expand
The distribution of target gas.
In sum, a kind of dynamic gas distribution instrument simple in construction that the present invention provides, controlling is good,
Air distributing method is simple, improves precision and the efficiency of proportioning target gas, and self has calibration
With automated cleaning ability, corrosion resistance is good, beneficially instrument maintenance.
Below it is only the preferred embodiment of the present invention, it is noted that for the art
For those of ordinary skill, on the premise of without departing from the technology of the present invention principle, it is also possible to make
Some improvement and modification, these improve and modification also should be regarded as protection scope of the present invention.
Claims (8)
1. a dynamic gas distribution instrument, it is characterised in that include that unstripped gas path, carrier gas are logical
Road and mixing duct, described unstripped gas path and carrier gas path are all with described mixing duct even
Logical, described unstripped gas path is provided with first flow controller, and described carrier gas path is provided with
Second flow controller, described second flow controller by control valve respectively with described the
One flow controller and mixing duct connect；The import of a described control valve and described second
Amount controller connects, and outlet connects described first flow controller and mixing duct respectively, regulation
A described control valve makes through described first flow controller and the gas of second flow controller
Body flow is consistent, reads described first flow controller and the numerical value of second flow controller respectively
And to its matching, to reduce distribution error.
Dynamic gas distribution instrument the most according to claim 1, it is characterised in that described first-class
The entrance of amount controller is parallel with some unstripped gas access leg, and described some unstripped gas access and prop up
It is equipped with electromagnetic valve on every branch road on road, is passed through described first in order to control corresponding unstripped gas
Flow controller.
Dynamic gas distribution instrument the most according to claim 1, it is characterised in that a described control
Valve processed is the three-way valve into scene 2, and its import is connected with described second flow controller, outlet
Connect described first flow controller and mixing duct respectively.
Dynamic gas distribution instrument the most according to claim 1, it is characterised in that a described control
Valve processed is two two-position two-way solenoid valve compositions, and described second flow controller passes through one of them
Two-position two-way solenoid valve is connected with described mixing duct, and described second flow controller passes through another
Individual two-position two-way solenoid valve is connected with described first flow controller.
Dynamic gas distribution instrument the most according to claim 1, it is characterised in that described mixing tube
Road is two to enter a tee T out, and two import connects described unstripped gas path and dilution respectively
Gas path, exports as target gas gas outlet.
Dynamic gas distribution instrument the most according to claim 1, it is characterised in that described first-class
Amount controller and second flow controller all use the flow-control of laminar flow differential pressure type measuring principle
Device, all carries temperature and pressure and compensates inside it.
Dynamic gas distribution instrument the most according to claim 1, it is characterised in that described unstripped gas
Path is provided with a three-way valve entering scene 2, and its import is connected with first flow controller, wherein
One outlet connects described mixing duct, and another outlet is air vent.
8. use the air distributing method that dynamic gas distribution instrument as claimed in claim 1 is carried out, its
It is characterised by, including following procedure:
Calculate initial flow, according to unstripped gas concentration S1, target gas concentration C1Always flow with target gas
The parameter of amount, the flow calculating required carrier gas is N1, the flow of unstripped gas is G1；
Self-cleaning program, closes the access of described unstripped gas, connects a described control valve, dilute
Outgassing circulates along described second flow controller, a control valve and first flow controller successively,
Carry out automatically cleaning；
Self-calibration routines, the controlled quentity controlled variable arranging described second flow controller is full scale N, if
Put the flow N of first flow controller1, wherein, N1Less than N, carrier gas presses above-mentioned automatically cleaning
The path circulation of program, by regulating a described control valve so that carrier gas fully enters institute
State unstripped gas path；After described first flow controller and second flow controller indicating value are stablized,
The flow indicating value of record second flow controller is N2, N2With N1Linear fit correlation；
Mixing distribution program, after described self-calibration routines, controls described first flow controller
Controlled quentity controlled variable be G1, the controlled quentity controlled variable controlling described second flow controller is N2, unstripped gas passes through
Described first flow controller, enters in described mixing duct, and carrier gas passes through described second
After amount controller, by regulating a described control valve so that carrier gas fully enters described mixed
Closing in pipeline, described unstripped gas mixes with described carrier gas, obtains target gas, by N1/G1Direct ratio
In S1/C1Relation calculate can obtain target gas concentration C1。
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| CN105527203A (en) * | 2015-12-31 | 2016-04-27 | 聚光科技(杭州)股份有限公司 | Smoke dust concentration direct-reading monitoring system and method |
| CN105642140B (en) * | 2016-01-14 | 2018-07-03 | 上海交通大学 | A kind of dynamic gas mixer and air distributing method |
| CN105806681B (en) * | 2016-06-06 | 2020-06-23 | 北京雪迪龙科技股份有限公司 | Standard gas distribution control method and system and standard gas distribution instrument |
| CN108534868A (en) * | 2017-03-02 | 2018-09-14 | 中国计量科学研究院 | A kind of gas-dynamic dilution air distribution system and its method |
| CN107051242B (en) * | 2017-05-31 | 2019-09-17 | 力合科技（湖南）股份有限公司 | A kind of dynamic gas distribution instrument and its air distributing method |
| CN107715711B (en) * | 2017-08-28 | 2019-11-08 | 深圳市好美达科技有限公司 | Proof-spirit gas generation apparatus |
| FR3093444B1 (en) * | 2019-03-06 | 2021-03-05 | Centre Nat Rech Scient | Microfluidic gas mixture generator |
| CN110237736B (en) * | 2019-06-19 | 2020-04-21 | 宁波格劳博机器人有限公司 | High-precision automatic additive batching device and method |
| CN112557591A (en) * | 2020-11-16 | 2021-03-26 | 中国科学院工程热物理研究所 | Dynamic mixed gas full-component flow calibration system and calibration method |
| CN112782357A (en) * | 2020-12-22 | 2021-05-11 | 汉威科技集团股份有限公司 | Automatic calibration method and device for gas sensor |
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| CN100458267C (en) * | 2007-01-15 | 2009-02-04 | 同济大学 | Air distributing device |
| CN101763096A (en) * | 2009-12-18 | 2010-06-30 | 北京七星华创电子股份有限公司 | Automatic calibrating and testing system and calibrating and testing method thereof |
| CN102698645B (en) * | 2012-05-30 | 2016-02-10 | 山西科致成科技有限公司 | Calibrating gas automatic mixing system |
| CN103528878B (en) * | 2013-11-05 | 2016-05-25 | 国家电网公司 | A kind of one-component dynamic air-distributing device |
| CN204429119U (en) * | 2014-12-30 | 2015-07-01 | 力合科技（湖南）股份有限公司 | A kind of dynamic gas distribution instrument |
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