CN106404969A - Flow regulation monitoring system for gas chromatograph and application method thereof - Google Patents
Flow regulation monitoring system for gas chromatograph and application method thereof Download PDFInfo
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- CN106404969A CN106404969A CN201610787977.1A CN201610787977A CN106404969A CN 106404969 A CN106404969 A CN 106404969A CN 201610787977 A CN201610787977 A CN 201610787977A CN 106404969 A CN106404969 A CN 106404969A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/26—Conditioning of the fluid carrier; Flow patterns
- G01N30/28—Control of physical parameters of the fluid carrier
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Abstract
The invention belongs to the technical field of a gas path flow real-time regulation monitoring system, and particularly relates to a flow regulation monitoring system for a gas chromatograph and an application method thereof. The flow regulation monitoring system comprises an auxiliary gas path and a supplementing gas path, wherein one end of the auxiliary gas path is connected with a pressure control device; the other end of the auxiliary gas path is connected with a flow monitoring device; one end of the supplementing gas path is connected with a pressure control device; the other end of the supplementing gas path is connected with the flow monitoring device through a flow control device; the flow monitoring device sends monitored data to a signal control system; a flow control-AD value-pressure control automatic correction mathematical model is preset in the signal control system; the signal control system obtains the monitoreddata according to the flow control-AD value-pressure control automatic correction mathematical model, and transmits the monitored data to a gas chromatograph display unit and a work station. The simple, fast and precise flow regulation by a user can be realized through a compact man-machine interaction interface; meanwhile, the accuracy and the repeatability of the analysis result of the gas chromatograph can be greatly improved.
Description
Technical field：
The invention belongs to gas circuit flow real-time regulation monitoring system technical field, refer in particular to a kind of stream for gas chromatograph
Amount adjusts monitoring system and application process.
Background technology：
At present, in conventional art, gas chromatograph is used for the control of detector gas flow path mostly using mechanical valve systems,
This system, during the gas circuit Flow-rate adjustment of gas chromatograph detector, needs constantly to pass through outside soap foam/electronic flowmeter etc.
Boundary's auxiliary equipment carries out artificial flow measurement and adjustment, and the process that adjusts is not only complicated loaded down with trivial details, and there is larger operating error,
Greatly promote the operation of naive user and use difficulty.Additionally, in the debugging process of gas chromatograph difference analysis demand, past
Toward the uninterrupted needing the repeatedly each auxiliary air passage of regulation, and it is difficult in actual applications ensure the repetition of multiple flow adjustment
Property, thus the data redundancy that impact is repeatedly analyzed, repeated workload is significantly increased.
Content of the invention：
It is an object of the invention to provide a kind of monitoring accuracy height, fast response time, simple and convenient for gas phase color
The Flow-rate adjustment monitoring system of spectrometer.
The present invention is realized in：
A kind of Flow-rate adjustment monitoring system for gas chromatograph, includes auxiliary air passage, supplements gas circuit, auxiliary air passage
One end be connected with pressure control device, the other end is connected with flow monitoring device, the one end and the Stress control that supplement gas circuit fill
Put connection, the other end is connected with flow monitoring device by volume control device, the data is activation that flow monitoring device will be monitored
To whistle control system, in described whistle control system, it is previously provided with the self-correcting between the control of flow-control AD duty pressure
Positive mathematical model, is obtained according to the self-correcting mathematical model between the control of flow-control AD duty pressure by whistle control system
Monitoring Data is simultaneously real-time transmitted in gas chromatograph display unit and work station.
Above-mentioned a kind of for, in the Flow-rate adjustment monitoring system of gas chromatograph, described flow monitoring device includes
Body, is provided with vivo at this and supplements gas circuit, the one-to-one stream of auxiliary air passage, be provided with for supervising on each stream
Survey the pressure transducer of pressure in gas circuit.
Above-mentioned a kind of for, in the Flow-rate adjustment monitoring system of gas chromatograph, each stream described being additionally provided with
Miniature precision vapour lock.
Above-mentioned a kind of for, in the Flow-rate adjustment monitoring system of gas chromatograph, described auxiliary air passage is provided with two
Road, supplements gas circuit and is provided with a road.
Above-mentioned a kind of in the Flow-rate adjustment monitoring system of gas chromatograph, wherein one road auxiliary air passage and supplement
Gas circuit carries out premixing by mixing tee after flow monitoring device.
Above-mentioned a kind of for, in the Flow-rate adjustment monitoring system of gas chromatograph, described pressure control device includes
Valve body, is provided with inlet channel and outlet passageway on valve body, and inlet channel is connected by the valve pocket of valve body with outlet passageway, connection
The inner of lever is located at the inside and outside end of valve pocket and is located at outside valve pocket, and gangbar is provided with adjusting rod, and adjusting rod is directed at inlet channel
Outlet, the position of adjusting rod is adjusted with elastic component by adjusting knob, and the diverse location of adjusting rod is used for controlling the pressure of gas input
Power size.
Above-mentioned a kind of for, in the Flow-rate adjustment monitoring system of gas chromatograph, described volume control device includes
Valve body, is provided with air inlet pipeline and outlet pipe on valve body, and air inlet pipeline is connected by the valve pocket of valve body with outlet pipe, valve
One end of bar is located in valve pocket and is aligned the outlet of air inlet pipeline, and the position of valve rod is adjusted with elastic component by adjusting knob, valve rod
Diverse location be used for adjusting gas flow size.
It is a further object to provide a kind of application side of the Flow-rate adjustment monitoring system for gas chromatograph
Method, comprises the steps：
(1) foundation of self-correcting mathematical model：
A, in signal processing system set conventional gas type；
The open amount of b, adjustment pressure control device and volume control device；
C, flow monitoring device measure real traffic；
D, the current corresponding A/D value of reading；
E, set up correction relationship between actual flow-AD value, the distribution between association AD value and pressure transducer simultaneously
Relation, sets up the self-correcting mathematical model between flow-control-AD value-Stress control, and is built in the control of signal processing system
In circuit processed；
(2) flow real-time monitoring：
A, selection desired gas type；
B, regulation pressure control device and volume control device；
C, real-time detection feedback flowpath pressure；
D, the self-correcting mathematical model passing through between flow-control-AD value-Stress control calculate, and obtain monitored stream
Data message；
E, real-time display output.
The advantage that the present invention projects compared to existing technology is：
1st, the present invention passes through pressure control device and the combination of volume control device is adjusted, and subsidiary minute precision vapour lock,
In high precision/can compensate for the flow monitoring systems such as pressure sensitive unit, flow-AD value-pressure numerical relationship model, by pressure/
The regulation of volume control device, can monitor the real-time pressure change information of stream and make model self-correcting calculating, thus quickly obtaining
Take the authentic communication of stream flow, and be transferred in the display unit and work station of gas chromatograph, by succinct man-machine friendship
Mutually interface helps user to realize simple, the quick and accurate adjustment of flow, and chromatographic result is greatly improved simultaneously
Accuracy and repeatability.
2nd, monitoring accuracy height of the present invention, fast response time, simple and convenient, it can be realized to detector each stream stream
The real-time monitoring of amount, asks for complicated, big, poor repeatability of operating error of gas flow adjustment process etc. during traditional chromatography
Topic provide good solution, be chromatographiccondition optimization, reproduction and automatization provide more reliable more perfect
Technical support.
Brief description：
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the generalized section of the present invention；
Fig. 3 is the schematic diagram of the pressure control device of the present invention；
Fig. 4 is the schematic diagram of the volume control device of the present invention；
Fig. 5 is the flow chart of the self-correcting Mathematical Models of the present invention；
Fig. 6 is the flow chart of the flow real-time monitoring of the present invention.
Specific embodiment：
With specific embodiment, the invention will be further described below, referring to Fig. 16：
A kind of Flow-rate adjustment monitoring system for gas chromatograph, includes auxiliary air passage 1, supplements gas circuit 2, assist gas
The one end on road 1 is connected with pressure control device 3, the other end is connected with flow monitoring device 4, supplements one end and the pressure of gas circuit 2
Control device 3 connects, the other end is connected with flow monitoring device 4 by volume control device 5, and flow monitoring device 4 will be monitored
Data is activation to signal processing system 6, be previously provided with flow-control AD duty pressure control in described signal processing system 6
Self-correcting mathematical model between system, by signal processing system 6 according to the self-correcting between the control of flow-control AD duty pressure
Positive mathematical model obtains Monitoring Data and is simultaneously real-time transmitted in gas chromatograph display unit and work station, letter largely
Change the gas circuit flow adjustment process of gas chromatograph, means of man-machine and data result obtain more direct convenience, meanwhile, profit
With high-resolution pressure transducer and high-precision micro precision vapour lock flow is monitored calculate it is ensured that gas control
The accuracy of good reproducibility and analytical data result and concordance.
The mode of real-time display output of the present invention is pressure monitoring information to be converted into digital information directly display,
User is facilitated intuitively to read current air-channel system flow value in the display unit and work station of gas chromatograph, thus significantly
Shorten analytical cycle.Largely simplify gas circuit flow adjustment process, means of man-machine and the data of gas chromatograph
Result obtains more direct convenience, and user need not complete the manual measurement of gas circuit flow again by auxiliary equipments such as electronic flowmeters,
Greatly reduce operational triviality and use difficulty.Meanwhile, using high-resolution pressure transducer and high-precision micro
Accurate vapour lock flow is monitored calculate it is ensured that gas control good repeatability and analytical data result accuracy,
Concordance.
Wherein, the AD value in self-correcting mathematical model is the corresponding digital signal of resolution, a/d resolution 221-225.
Further, described flow monitoring device 4 includes body 7, is provided with and supplements gas circuit 2, auxiliary in body 7
The one-to-one stream 8 of gas circuit 1, is provided with the pressure transducer 9 for monitoring pressure in gas circuit on each stream 8.This
Bright pressure transducer 9 adopts high accuracy/compensable pressure transducer.Possess high-resolution, low-response time and environment temperature
Degree drift compensation function, the wide-range span of control of 0-100psi, in achievable flow path, the real-time change of gas is carried out quickly
Timely accurately detection is fed back.
Further, each stream 8 described is additionally provided with Miniature precision vapour lock 10, is a kind of high accuracy, high stability
Draught control unit.Stream aluminium block outlet inside is suspended in by uniform sealing, reliable hollow quartz construction has ensured miniature
The long-time stability of accurate vapour lock 10 and batch concordance.
Wherein, pressure transducer 9 is in the front end of Miniature precision vapour lock 10.Using high-resolution pressure transducer 9 He
High-precision micro precision vapour lock 10 is adjusted to flow and monitoring calculation, has an effect of high precision, monitoring precision up to
0.01-0.05ml/min.
Specifically, auxiliary air passage 1 of the present invention is provided with two-way, supplements gas circuit 2 and is provided with a road, and wherein one tunnel is auxiliary
Gas circuit 1 is helped to carry out premixing by mixing tee 11 with supplementing gas circuit 2 after flow monitoring device 4.
The structure of pressure control device 3 of the present invention is as follows：Include valve body 12, air inlet is provided with valve body 12 and leads to
Road 13 and outlet passageway 14, inlet channel 13 connects by valve pocket with outlet passageway 14, the inner of gangbar 15 positioned at valve pocket interior,
Outer end is located at outside valve pocket, and the inner of gangbar 15 is provided with adjusting rod 16, and adjusting rod 16 is directed at the exit of inlet channel 13, adjusts
The position of pole 16 is adjusted with elastic component 18 by adjusting knob 17, and one end of elastic component 18 holds out against on adjusting knob 17, another
End withstands on adjusting rod 16, is set with corrugated tube 19 outside the adjusting rod 16 outside valve body 12.By the regulation of adjusting knob 17, adjust
Pole 16 end obtains suitable adjustment with the space of inlet channel 13 outlet, to form the stability contorting to gas flow path pressure,
And realize controlling the pressure size of gas input.
Certainly, pressure control device 3 is except said structure, it would however also be possible to employ diaphragm type stable-pressure device, mainly by valve element, bullet
Property unit, diaphragm three parts composition, when fluid persistently inputs, diaphragm is subject to the double of top Flexible element and fluid beneath pressure
Recast is used, and forms stable interstitial structure, thus maintaining the pressure balance of stream.
Volume control device 5 of the present invention includes valve body 20, is provided with air inlet pipeline 21 and gives vent to anger on valve body 20
Pipeline 22, air inlet pipeline 21 is connected by valve pocket with outlet pipe 22, and one end of valve rod 23 is aciculiform adjustable side 24, and aciculiform is adjusted
End 24 is located in valve pocket, and aciculiform adjustable side 24 is directed at the outlet of air inlet pipeline 21, makes aciculiform by adjusting knob 25 and elastic component 26
Adjustable side 24 obtains suitable adjustment, to complete the precise control to gas flow path flow with the space of air inlet pipeline 21 outlet.
Certainly, volume control device 5 is except said structure, it would however also be possible to employ following structure：
In cavity, there is diaphragm valve, and with this, cavity is divided into upper and lower two and mutually do not connect air chamber, mainly by air chamber, pin
Shape push rod, valve, Flexible element, the most of composition of rubber isolated location five, Flexible element provides the pressure difference value of upper lower chamber,
Rubber isolated location is made to keep a more stable state, thus forming stable flow output.
The operation principle of the present invention：
Detector supplements gas and passes sequentially through from pressure control device 3 and volume control device 5, enters back into flow monitoring device
In 4, meanwhile, in addition two-way auxiliary gas enters directly into flow monitoring device 4 from pressure control device 3, Stress control
Device 3 passes through hold-doun nut 27 with volume control device 5 with flow monitoring device 4 and gas path joint 28 is connected, Dang Sanlu
After gas enters flow monitoring device 4, pressure transducer 10 monitoring pressure in real time situation of change, and it is entered into signal processing
In system 6, after signal processing system 6 carries out flow-control-AD value-pressure controlled Data correction analyzing and processing, institute will be corrected
The flow information obtaining is transferred in the display unit and work station of gas chromatograph, has Miniature precision in flow monitoring device 4
Vapour lock 10, for providing stable accurate resistance, when supplementing gas and auxiliary gas after flow monitoring device 4, by mixing three
Logical 11 carry out premixing, simultaneously enter in detector with another auxiliary gas, thus forming complete detector air-path control system.
Pressure transducer 10 can transmit out the pressure data detecting to self-correcting positive model, and related data information is passed through
After process, in the display unit of gas chromatograph and in work station, data feedback process is faster, small for Real-time Feedback
Instantaneous gas circuit flowed fluctuation all can be ageing prominent by real time record.
It is a further object to provide a kind of application side of the Flow-rate adjustment monitoring system for gas chromatograph
Method, comprises the steps：
(1) foundation of self-correcting mathematical model：
A, in signal processing system set conventional gas type；
The open amount of b, adjustment pressure control device and volume control device, open amount (0.0-100.0)；
C, flow monitoring device 4 measure real traffic；
D, the current corresponding A/D value (a/d resolution 2 of reading21-225)；
E, set up correction relationship between actual flow-AD value, the distribution between association AD value and pressure transducer simultaneously
Relation, sets up the self-correcting mathematical model between flow-control-AD value-Stress control, and is built in the control of signal processing system
In circuit processed；
(2) flow real-time monitoring：
A, selection desired gas type；
B, regulation pressure control device and volume control device；
C, real-time detection feedback flowpath pressure；
D, the self-correcting mathematical model passing through between flow-control-AD value-Stress control calculate, and obtain monitored stream
Data message；
E, real-time display output：It is transferred in gas chromatograph display unit and work station.
Above-described embodiment is only one of presently preferred embodiments of the present invention, not limits the practical range of the present invention with this, therefore：
The equivalence changes that all shapes under this invention, structure, principle are done, all should be covered by within protection scope of the present invention.
Claims (8)
1. a kind of Flow-rate adjustment monitoring system for gas chromatograph it is characterised in that：Include auxiliary air passage, supplement gas
Road, one end of auxiliary air passage is connected with pressure control device, the other end is connected with flow monitoring device, supplement gas circuit one end with
Pressure control device connects, the other end is connected with flow monitoring device by volume control device, and flow monitoring device will be monitored
Data is activation to whistle control system, be previously provided with described whistle control system flow-control AD duty pressure control
Between self-correcting mathematical model, by whistle control system according to flow-control AD duty pressure control between self-correcting positive number
Learn model to obtain Monitoring Data and be real-time transmitted in gas chromatograph display unit and work station.
2. a kind of Flow-rate adjustment monitoring system for gas chromatograph according to claim 1 it is characterised in that：Described
Flow monitoring device includes body, is provided with vivo at this and supplements gas circuit, the one-to-one stream of auxiliary air passage, at each
Pressure transducer for monitoring pressure in gas circuit is provided with stream.
3. a kind of Flow-rate adjustment monitoring system for gas chromatograph according to claim 2 it is characterised in that：Described
Miniature precision vapour lock is additionally provided with each stream.
4. a kind of Flow-rate adjustment monitoring system for gas chromatograph according to Claims 2 or 3 it is characterised in that：
Described auxiliary air passage is provided with two-way, supplements gas circuit and is provided with a road.
5. a kind of Flow-rate adjustment monitoring system for gas chromatograph according to claim 4 it is characterised in that：Wherein
One road auxiliary air passage carries out premixing by mixing tee with supplementing gas circuit after flow monitoring device.
6. a kind of Flow-rate adjustment monitoring system for gas chromatograph according to claim 1 it is characterised in that：Described
Pressure control device includes valve body, is provided with inlet channel and outlet passageway on valve body, and inlet channel is led to outlet passageway
Cross the valve pocket connection of valve body, the inner of gangbar is located at the inside and outside end of valve pocket and is located at outside valve pocket, and gangbar is provided with adjusting rod,
Adjusting rod is directed at the outlet of inlet channel, and the position of adjusting rod is adjusted with elastic component by adjusting knob, the diverse location of adjusting rod
For controlling the pressure size of gas input.
7. a kind of Flow-rate adjustment monitoring system for gas chromatograph according to claim 1 it is characterised in that：Described
Volume control device includes valve body, is provided with air inlet pipeline and outlet pipe on valve body, and air inlet pipeline is led to outlet pipe
Cross the valve pocket connection of valve body, one end of valve rod is located in valve pocket and is aligned the outlet of air inlet pipeline, the position of valve rod is by adjusting rotation
Button is adjusted with elastic component, and the diverse location of valve rod is used for the size of adjusting gas flow.
8. a kind of application process of the Flow-rate adjustment monitoring system for gas chromatograph it is characterised in that：Comprise the steps：
(1) foundation of self-correcting mathematical model：
A, in signal processing system set conventional gas type；
The open amount of b, adjustment pressure control device and volume control device；
C, flow monitoring device measure real traffic；
D, the current corresponding A/D value of reading；
E, set up correction relationship between actual flow-AD value, the relations of distribution between association AD value and pressure transducer simultaneously,
Set up the self-correcting mathematical model between flow-control-AD value-Stress control, and be built in the control circuit of signal processing system
In；
(2) flow real-time monitoring：
A, selection desired gas type；
B, regulation pressure control device and volume control device；
C, real-time detection feedback flowpath pressure；
D, the self-correcting mathematical model passing through between flow-control-AD value-Stress control calculate, and obtain the data of monitored stream
Information；
E, real-time display output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610787977.1A CN106404969A (en) | 2016-08-31 | 2016-08-31 | Flow regulation monitoring system for gas chromatograph and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610787977.1A CN106404969A (en) | 2016-08-31 | 2016-08-31 | Flow regulation monitoring system for gas chromatograph and application method thereof |
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| CN106404969A true CN106404969A (en) | 2017-02-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113504331A (en) * | 2021-07-01 | 2021-10-15 | 安徽色谱仪器有限公司 | Pressure flow control device and gas chromatograph thereof |
| CN114184724A (en) * | 2022-02-15 | 2022-03-15 | 华谱科仪(北京)科技有限公司 | Method and device for compensating carrier gas flow of chromatograph and storage medium thereof |
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Application publication date: 20170215 |