CN103900863B - A kind of built-in constant current sampler - Google Patents
A kind of built-in constant current sampler Download PDFInfo
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- CN103900863B CN103900863B CN201410165892.0A CN201410165892A CN103900863B CN 103900863 B CN103900863 B CN 103900863B CN 201410165892 A CN201410165892 A CN 201410165892A CN 103900863 B CN103900863 B CN 103900863B
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Abstract
The invention provides a kind of built-in constant current sampler, including gas distributor and gas analysis air chamber.Gas distributor includes probe tube and a loudspeaker cavity, loudspeaker cavity includes: the first opening and the second opening, the internal diameter of described loudspeaker cavity is gradually reduced along described first opening to the direction of the second opening, probe tube is arranged on the middle part of loudspeaker cavity, is connected by disc type vapour lock pipe between probe tube with gas analysis air chamber.During work, sample gas flows along the first opening of described loudspeaker cavity to the second opening, under the suction of oscillation amplitude adjustable vibration pump, is sucked in gas analysis air chamber by probe tube at the middle part of loudspeaker cavity.The vapour lock relations of distribution of apparatus of the present invention, vibration pumping and front and back can the flow of stationary flow undue gassing room well to two grades of feedback Traffic conditioning mechanisms, solve sampler sample flow in prior art and affected greatly by sample gas flowed fluctuation, the problem that sample flow is unstable.
Description
Technical field
The present invention relates to gas analysis technology field, particularly relate to a kind of built-in constant current sampler.
Background technology
Commercial production usually needs use on-line gas analysis device that industrial gases are analyzed, online gas
Analyzer can carry out the measurement of real-time continuous to the component and content thereof analyzing sample gas.In prior art, for
Stabilizing gas sample flow, installs permanent flow valve additional before the analysis air chamber in analyzer.The change of gas flow rate
The pressure reduction causing the elastic adjusting plate upper and lower faces within permanent flow valve changes, and makes elastic adjusting plate machinery
Deformation changes the sectional area of air inlet, reaches the purpose of adjusting gas flow.Permanent flow valve is to send out in perceived flux
Reached the purpose of current stabilization by the sectional area of regulation air inlet after changing.Permanent flow valve regulation during,
Owing to without gas pressure isolation vapour lock, gas pressure buffer system and bypass structure, actual steady flow result is poor.
And permanent flow valve structure is more complicated, commercial measurement scene is damaged, can only the new permanent flow valve of integral replacing, become
This height.
In gas on-line analysis, other method is employing injector constant-current device inside analyzer, and utilization is drawn
Emanate pressure and this body structure of injector stablizes sample flow.But injector needs external compressed air
There is provided injection gas, particularly some explosion-proof scene can only be used as injection gas with compressed nitrogen.Compressed air or
The consumption of nitrogen is big, generally 1.5L/Min, and, stablizing injection atmospheric pressure needs additional stable-pressure device,
This cost that maintenance instrument all can be made to run improves.Additionally, due to industry sample gas dust is more, need at sample
Filter is installed in gas porch.Pneumatic filter vapour lock is big, and the suction capactity of injector is limited, sample gas pressure
Constant current sampling difficulty can be caused time low, then can only use low precision sample gas filter, cause a large amount of dust micro-
Grain enters analyzes air chamber, affects measurement result.
Summary of the invention
In view of this, the invention provides a kind of built-in constant current sampler.Main purpose is to solve existing
In technology, sampler sample flow is affected greatly by sample gas flowed fluctuation, and sample flow is unstable, sample flow
The problem that regulation reaction is slow.
The one built-in constant current sampler that the present invention provides, including gas distributor and gas analysis air chamber,
Described gas distributor includes: probe tube and a loudspeaker cavity, and described loudspeaker cavity includes: the first opening
With the second opening, the internal diameter of described loudspeaker cavity along described first opening to the direction of the second opening by
The least, described probe tube is arranged on the middle part of described loudspeaker cavity, described probe tube and described loudspeaker cavity
All connect with described gas analysis air chamber；During work, sample gas along the first opening of described loudspeaker cavity to
Two opening flowings, and divided by the described probe tube part described gas of suction at the middle part of described loudspeaker cavity
In gassing room.
Further, described built-in adjustable constant current sampler, also include: disc type vapour lock pipe, described dish
Formula vapour lock pipe is connected between described probe tube and described gas analysis air chamber.
Further, described gas distributor also includes: Powdex filter, and described Powdex filter is sealed in institute
State loudspeaker cavity the first opening.
Further, described built-in adjustable constant current sampler, also include: buffer and a frequency-adjustable
Vibration pump, described buffer includes first surge chamber to the n-th surge chamber of sequential communication, and described n is big
In the positive integer equal to 2, described first surge chamber is connected with described analysis cell, and described vibration pump is arranged
On communication path between arbitrary two adjacent surge chambers.
Further, described n=3, all use vapour lock pipe to connect between described adjacent buffer room.
Further, described gas distributor also includes: exhaustor I and exhaustor II, described loudspeaker cavity
Two openings, exhaustor I and exhaustor II sequential communication, the diameter of described exhaustor I is more than described first
The diameter of opening, the diameter of described exhaustor II is less than the diameter of described first opening, and the described 3rd delays
The gas output end rushing room connects with described exhaustor II.
Further, described vibration pump includes: the pump housing, current potential.
Beneficial effects of the present invention: the gas sampling device sampling stream used for existing on-line gas analysis device
Amount instability, is easily affected by sample gas flowed fluctuation and the slow-footed problem of sampling flow governing response.This
Invention provides the constant current sampler that a kind of sample flow stably can be built-in, and the vapour lock distribution of apparatus of the present invention is closed
System, pressure buffer structure, electromagnetic oscillation pumping and front and back to two grades feedback Traffic conditioning mechanisms can be well
The flow of stationary flow undue gassing room and improve sampling flow governing response speed.
Accompanying drawing explanation
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is the structural representation of built-in adjustable constant current sampler.
Fig. 2 is the structural representation of gas cushion and electromagnetic oscillation pump.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
Embodiment one: as it is shown in figure 1, be the structural representation of built-in adjustable constant current sampler.This takes
Sampling device includes gas distributor 1, vapour lock pipeline 12, analyzes air chamber 13, gas cushion 20, electromagnetic vibration
Swinging pump 17, the entrance of disc type vapour lock pipeline 12 is connected with the probe tube 2 of gas distributor 1, vapour lock pipeline
The outlet of 12 is connected with the entrance analyzing air chamber 13, the gas access 22 of gas cushion 20 and analysis gas
The outlet of room 13 is connected, and electromagnetic oscillation pump 17 is fixed on gas cushion 20 with gas cushion 20 even
Logical.
The gas distributor 1 of this sampler includes: pressing plate 3, filter 7, loudspeaker cavity 8, seat 9,
Exhaustor I 10, exhaustor II 11, powder of stainless steel filter 7 is sealed in described horn chamber by pressing plate 3
Body 8 first opening, the second opening of loudspeaker cavity 8 is directly connected to exhaustor I 10, exhaustor I
The other end of 10 is directly connected to exhaustor II 11.
In the present embodiment, the bore of loudspeaker cavity 8 is designed as pre-large post-small, and small-bore one end connects exhaustor I
10, probe tube 2 is positioned at the middle part of loudspeaker cavity 8.The front end of loudspeaker cavity 8 connects sample gas inlet,
Pressure is relatively big, and front end bore can discharge rapidly greatly the pressure at sample gas inlet, and rear end connects exhaustor I 10,
Pressure is low, and rear end bore I, with the gas withdrawal rate that slows down, plays potentiation.Probe tube 2 is positioned at loudspeaker
The middle part of cavity 8, when industry sample gas pressure oscillation, at the pressure base of loudspeaker cavity 8 middle
This is stable, it is possible to realize constant voltage sampling, ready for follow-up constant current extraction.
The loudspeaker cavity 8 of gas distributor 1, exhaustor I 10 and the direct phase of exhaustor II 11 in the present embodiment
Even, vapour lock is little.The little vapour lock of bore of probe tube 2 is big, enters the sample gas of sample gas inlet 5 except constant current extraction
In a small amount outside sample gas, remaining sample gas is outside exhaustor I 10 is last again via exhaustor II 11 discharger.This
On the one hand the vapour lock relation of sample can reduce sample flow and be subject to industry sample gas pressure variations influence, on the other hand can
Discharge this device with quickening sample gas, thus accelerate the analysis response speed of analytical tool.If sampling is for dividing
The flow of analysis is 1L/h, and the sample gas flow entering gas distributor is 100L/h, then the sample gas of 99L/h passes through
Exhaustor I 10 is discharged outside this device.If industry sample gas enters gas distributor 1 because of pressure oscillation ambassador
Flow generation larger fluctuation, as changed back and forth at 30L/h to 100L/h, this vapour lock relations of distribution and perseverance
Stream extraction result make 1L/h flow enter analyze air chamber 13 responded by sensor, remaining gas all via
Exhaustor I 10 and exhaustor II 11 are discharged outside this device.
The exhaustor II 11 relative aperture loudspeaker cavity 8 of gas distributor 1, exhaustor I 10 mouthfuls in the present embodiment
Footpath is little, and vapour lock becomes big.And exhaustor II 11 is connected with gas outlet 23 threeway of gas cushion 20.This
When kind structure makes the flow of sample gas inlet 5 change, the pressure of exhaustor II 11 is the sensitiveest to be become
Change, after gas outlet 23 supercharging of gas cushion 20, buffer the pressure generation respective change of III Room 19,
Ready for flow feedback regulation.
Probe tube 2 has disc type vapour lock pipeline 12 with analyzing to be connected between air chamber 13, and vapour lock pipeline 12 is this dress
Putting the parts that middle vapour lock is maximum, the high vapour lock of vapour lock pipeline can isolate the change of sample gas pressure to analyzing air chamber 13
Impact.
In the present embodiment, buffer 20 includes: buffers I Room 14, buffer II Room 16, buffer III Room 19, three
Individual surge chamber passes through vapour lock pipe I 15, and vapour lock pipe II 18 is sequentially connected with.Buffer the gas access 22 of I Room 14
Being connected with the outlet analyzing air chamber 13, the gas outlet 23 buffering III Room 19 is connected with exhaustor II 11 threeway.
The drum-shaped lid of three surge chambers sealing ring crimps on the base plate (21, requires air tight at sealing.Three
Individual surge chamber is respectively provided with bigger cavity, and gas pressure change carries out smoothing buffer, reduces pressure jump shadow
Ring constant current sampling.By vapour lock pipe I 15, vapour lock pipe II 18 isolation between three surge chambers, make three surge chambers
Relatively independent have pressure reduction and be interconnected again.
In buffering II Room 16, buffer connection electromagnetic oscillation pump 17, entering of electromagnetic oscillation pump 17 between III Room 19
Mouth is connected with buffering II Room 16, and the outlet of electromagnetic oscillation pump 17 is connected with buffering III Room 19.Gas delays
Rush gas access 22 vapour lock of device 20 relatively big, pressure when electromagnetic oscillation pump 17 carries out Flow-rate adjustment can be isolated
The pressure change of power change and exhaustor II 11 impact on analyzing air chamber 13.Electromagnetic oscillation pump has with pump
Body pressure at two ends increases the characteristic that suction flow reduces, and both can work under buffering II Room 16 negative pressure, it is possible to
With in the direct draught work of buffering II Room 16, say, that electromagnetic oscillation pump is vacuum pump, is again compression pump.
It addition, the benefit using electromagnetic oscillation pump is to be up in the life-span more than 10 years, and the pump of driven by motor is due to rotating shaft
With commutation brush wear, the life-span only has 1～2 year.
In the present embodiment, loudspeaker cavity 8 first opening being provided with filter 7, filter 7 is by being placed on
Pressing plate 3 thereon is fixed on loudspeaker cavity 8 first opening termination, and pressing plate is fixed by tight lock screw 4.
Pressing plate 3 and filter 7 are lined with O type rubber seal 6.Industrial gases typically contain a large amount of dust, sample
Gas needs to filter through filter to be used for gas analysis, can periodically unclamp lock-screw in the present embodiment
4 taking-up powder of stainless steel filters 7 reinstall use after being replaced or cleaning powder of stainless steel filter 7.
The benefit using powder of stainless steel filter 7 is corrosion-resistant, absorption low to gas, recycling capable of washing.
In the present embodiment, all of vapour lock pipeline rustless steel tubule curves coil pipe and makes, can as required
The number of turns of vapour lock size increase and decrease coil pipe, easily manufactured.
In the present embodiment, being connected with each other between parts is that rustless steel cutting ferrule is threaded, detachably any one
Component inspection is changed, it is simple to safeguard.
Embodiment two: as in figure 2 it is shown, be the structural representation of gas cushion and electromagnetic oscillation pump.Electromagnetism
Vibration pump 17 includes: coil 27, pedestal 24, iron plate 25, the pump housing 26, with setting potentiometer 28
Drive circuit 29, iron plate 25 is fixed on pedestal 24, and the pump housing 26 is fixed on pedestal 24.The pump housing 26
Respectively with buffer II Room 16 and buffering III Room 19 connect, during work coil 27 drive circuit 29 act under
Driving iron plate 25 to move up and down, iron plate 25 draws the pump housing 26 suction buffering II Room 16 and buffering III Room
The gas of 19.
The vapour lock relations of distribution of apparatus of the present invention, pressure buffer structure and front and back to two grades feedback Flow-rate adjustment machines
System can the gas flow of steady flow undue gassing room 13 well.Pressure buffer is mainly by vapour lock pipe and gas
Buffer 20 realizes.
The constant current sampling mechanism of apparatus of the present invention is as follows: electromagnetic oscillation pump forced oscillation under the effect of drive circuit
Dynamic, it is provided that constant draft, the gas of extraction buffering II Room 16 enters buffering III Room 19, makes buffering II Room
16 form negative pressure, buffer III Room 19 and form malleation, are simultaneously connected with in buffering II Room 16 and buffering III Room 19
Between vapour lock pipe II 18 can form reflux, final under the common effect of electromagnetic oscillation pump and vapour lock pipe II 18
The pressure reduction that can make buffering II Room 16 and buffering III Room 19 is stable, the flow of electromagnetic oscillation pump 17 suction and vapour lock
The flow of pipe II 18 reflux reaches dynamic equilibrium, is pressure reduction vicarious Flow-rate adjustment principle.After dynamic equilibrium,
The flow flowing through vapour lock pipe I 15 is the most stable, and the flow flowing through analysis air chamber 13 is the most stable.
When the flow of this device sample gas inlet 5 or pressure change, adjust to two grades of feedback flows before and after following
Joint mechanism regulation effect under, flow through analyze air chamber 13 flow just can the most constant when adjustment setting
On flow value.As follows to two grades of feedback Traffic conditioning mechanisms Principles of Regulation front and back:
When sample gas inlet 5 flow increases, and the sample flow at probe tube 2 will increase therewith, the tune of generation
Joint process is:
Backward regulation is little due to exhaustor I 10 and exhaustor II 11 vapour lock of gas distributor 20, gas
The gas outlet 23 of body buffer 20 connects buffering III Room 19 and exhaustor II 11, buffers III Room 19 with regard to energy
Quickly sensing the change of sample gas flow, result buffers III Room 19 pressure to be increased, electromagnetic oscillation pump 17 suction streams
Amount reduces, and this is that the first order feeds back Traffic conditioning mechanisms；It is positioned at buffering II Room 16 and buffering III Room 19 simultaneously
Between vapour lock pipe II 18 return buffering II Room 16 flow also increase, this be the second level feed back Flow-rate adjustment
Mechanism.The result of two-stage feedback Flow-rate adjustment is all to reduce to flow through the flow analyzing air chamber 13, until buffering
Buffering II when pressure reduction between II Room 16 and buffering III Room 19 does not change with sample gas inlet 5 flow
Room 16 is identical with buffering III Room 19 pressure reduction, and Flow-rate adjustment process terminates.
Forward direction regulation sample gas inlet 5 flow increases, owing to vapour lock pipeline 12 vapour lock is maximum, and sample flow
By relatively slow for response, but trend still results in buffering I Room 14 and buffering II Room 16 pressure increases, and also can make
Electromagnetic oscillation pump 17 suction flow reduces.Until the pressure reduction between buffering II Room 16 and buffering III Room 19 and sample
Buffering II Room 16 when gas entrance 5 flow does not change is identical with buffering III Room 19 pressure reduction, and flow is adjusted
Joint process terminates.
After Flow-rate adjustment terminates, buffer II Room 16 inflow buffering III Room 19 flow and do not have with sample gas inlet 5 flow
When changing, buffering II Room 16 inflow buffering III Room 19 flow identical, this flow is also equal to buffer I
Room 14 flows into the flow of buffering II Room 16 through vapour lock pipe I 15, also should be the stream flowing through and analyzing air chamber 13
Amount.Buffer the flow that II Room 16 flows into flow-vapour lock pipe II 18 reflux of buffering III Room 19 flows=pumping.
After Flow-rate adjustment process terminates, the pressure of three surge chambers 14,16,19 all increased, and makes analysis
The pressure reduction that air chamber 13 is imported and exported remains unchanged, and flows through the gas flow rate constant analyzing air chamber 13.When sample gas enters
When mouth flow reduces, the Flow-rate adjustment process of device is contrary to the above, but result is to flow through analysis air chamber equally
The constant flow of 13 is constant.The vapour lock relations of distribution of apparatus of the present invention, pressure buffer structure, electromagnetic oscillation pump
17 suctions and front and back can the flow of steady flow undue gassing room 13 well to two grades of feedback Traffic conditioning mechanisms.
In the present invention, the aspiration of electromagnetic oscillation pump 17 is determined by drive circuit 29, therefore needs to drive circuit
The preset parameter of setting potentiometer 28 of 29, this parameter is to analyze air chamber to analyze the nominal of necessary flow value
Value.Established standards value in accordance with the following steps, is connected with large capacity meter by steel cylinder gas and receives the sample gas of the present invention
Entrance 5 provides sample gas, small flowmeter to be serially connected in and analyzes air chamber 13 outlet and enter with the gas of gas cushion 20
Between mouth 22.Air relief valve on regulation steel cylinder, making this device sample gas inlet 5 flow is industry sample gas scope
Intermediate value, large capacity meter indicates the size of this value.Potentiometer 28 on regulation drive circuit 29, makes little
Effusion meter indicated value is to analyze air chamber to analyze the nominal value of necessary flow value.Now, the electricity on drive circuit 29
The setting value of position device 28 is exactly to analyze air chamber to analyze the nominal value of necessary flow value.After adjustment terminates, sample gas enters
Mouth 5 connects sample gas, and electromagnetic oscillation pump provides constant draft under the effect of drive circuit.When this device sample gas
When the flow of entrance changes, front and back under the regulation effect of two grades of feedback Traffic conditioning mechanisms, flow through
The flow analyzing air chamber just can be on the most constant flow value when adjustment.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although
With reference to preferred embodiment, the present invention is described in detail, it will be understood by those within the art that,
Technical scheme can be modified or equivalent, without deviating from technical solution of the present invention
Objective and scope, it all should be contained in the middle of scope of the presently claimed invention.
Claims (5)
1. a built-in constant current sampler, including gas distributor and gas analysis air chamber, it is characterised in that:
Described gas distributor includes: probe tube and a loudspeaker cavity, and described loudspeaker cavity includes: the first opening
With the second opening, the internal diameter of described loudspeaker cavity along described first opening to the direction of the second opening by
The least, described probe tube is arranged on the middle part of described loudspeaker cavity, described probe tube and described loudspeaker cavity
All connect with described gas analysis air chamber；During work, sample gas along the first opening of described loudspeaker cavity to
Two opening flowings, and divided by the described probe tube part described gas of suction at the middle part of described loudspeaker cavity
In gassing room；The vibration pump of buffer and a frequency-adjustable, described buffer includes that the first of sequential communication delays
Rushing room to the n-th surge chamber, described n is the positive integer more than or equal to 2, described first surge chamber and described gas
Body analysis room connects, and described vibration pump is arranged on the communication path between arbitrary two adjacent surge chambers；
Also include that disc type vapour lock pipe, described disc type vapour lock pipe are connected to described probe tube and described gas analysis gas
Between room；Vapour lock pipe is all used to connect between described adjacent buffer room.
2. built-in adjustable constant current sampler as claimed in claim 1, it is characterised in that: described gas
Allotter also includes: Powdex filter, and described Powdex filter is sealed in described loudspeaker cavity the first opening.
3. built-in adjustable constant current sampler as claimed in claim 1, it is characterised in that: described n=
3。
4. built-in adjustable constant current sampler as claimed in claim 2, it is characterised in that: described gas
Allotter also includes: exhaustor I and exhaustor II, described loudspeaker cavity the second opening, exhaustor I and
Exhaustor II sequential communication, the diameter of described exhaustor I is more than the diameter of described first opening, described row
The diameter of trachea II is less than the diameter of described first opening, the gas output end of described 3rd surge chamber and institute
State exhaustor II connection.
5. built-in adjustable constant current sampler as claimed in claim 1, it is characterised in that: described vibration
Pump includes: the pump housing, current potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410165892.0A CN103900863B (en) | 2014-04-23 | 2014-04-23 | A kind of built-in constant current sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410165892.0A CN103900863B (en) | 2014-04-23 | 2014-04-23 | A kind of built-in constant current sampler |
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| Publication Number | Publication Date |
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| CN103900863A CN103900863A (en) | 2014-07-02 |
| CN103900863B true CN103900863B (en) | 2016-08-17 |
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| CN201410165892.0A Active CN103900863B (en) | 2014-04-23 | 2014-04-23 | A kind of built-in constant current sampler |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729892A (en) * | 2015-03-24 | 2015-06-24 | 南京埃森环境技术有限公司 | PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on multichannel parallel feedback control |
| CN106153407A (en) * | 2015-04-02 | 2016-11-23 | 赵正芳 | A kind of gas sample detection equipment |
| CN109596395B (en) * | 2018-12-12 | 2020-12-11 | 浙江大学 | Online multi-point gas sampling analysis system and testing method under pipeline internal steady state |
| CN113671075A (en) * | 2021-08-16 | 2021-11-19 | 合肥中科光博量子科技有限公司 | Portable non-methane total hydrocarbon analyzer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1932862C3 (en) * | 1969-06-28 | 1979-04-05 | Perkin-Elmer Ltd., Beaconsfield, Buckinghamshire (Grossbritannien) | Arrangement for regulating a gas flow |
| JPH07260644A (en) * | 1994-03-26 | 1995-10-13 | Horiba Ltd | Sampler for gas analysis |
| JP2003075308A (en) * | 2001-09-06 | 2003-03-12 | Tsukasa Sokken Co Ltd | Mini constant flow rate sampling apparatus |
| CN203798638U (en) * | 2014-04-23 | 2014-08-27 | 重庆川仪分析仪器有限公司 | Built-in adjustable constant-current sampling device |
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2014
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