CN103900863A - Built-in constant current sampling device - Google Patents
Built-in constant current sampling device Download PDFInfo
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- CN103900863A CN103900863A CN201410165892.0A CN201410165892A CN103900863A CN 103900863 A CN103900863 A CN 103900863A CN 201410165892 A CN201410165892 A CN 201410165892A CN 103900863 A CN103900863 A CN 103900863A
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Abstract
The invention provides a built-in constant current sampling device, comprising a gas distributor and a gas analysis chamber, wherein the gas distributor comprises a sampling tube and a trumpet-shaped cavity body, the trumpet-shaped cavity body comprises a first open end and a second open end, the inner diameter of the trumpet-shaped cavity body is gradually reduced in the direction from the first open end to the second open end, and the sampling tube is arranged in the middle part of the trumpet-shaped cavity body and is communicated with the gas analysis chamber through a coiled air-resistance tube. In use, sample gas flows from the first open end to the second opened end of the trumpet-shaped cavity body, and is sucked into the gas analysis chamber through the sampling tube in the middle part of the trumpet-shaped cavity body under the pumping of a vibration pump with the adjustable vibration amplitude. According to the built-in constant current sampling device provided by the invention, through the air-resistance distribution relation, the suction of the vibration pump and a forward-backward two-stage feedback flow regulation mechanism, the flow of gas flowing through the gas analysis chamber can be greatly stabilized, so that the problems that the influence of fluctuation of the flow of sample gas on the sampling flow of a sampling device is large, and the sampling flow is unstable in the prior art are solved.
Description
Technical field
The present invention relates to gas analysis technology field, relate in particular to a kind of built-in constant current sampler.
Background technology
In commercial production, usually need to adopt on-line gas analysis device to analyze industrial gasses, on-line gas analysis device can carry out the measurement of real-time continuous to component and the content thereof of analyzing sample gas.In prior art, for stabilizing gas sample flow, before the analysis air chamber in analyzer, install permanent flow valve additional.The variation of gas flow rate causes that the pressure reduction of the elastic adjusting plate upper and lower faces of permanent flow valve inside changes, and makes the sectional area of elastic adjusting plate mechanically deform change air intake opening, reaches the object of adjusting gas flow.Permanent flow valve is by regulating the sectional area of air intake opening to reach the object of current stabilization after perceived flux changes.Permanent flow valve is in the process regulating, and owing to isolating vapour lock, gaseous tension buffer system and bypass structure without gaseous tension, actual steady flow result is poor.And permanent flow valve structure is more complicated, commercial measurement scene has been damaged, can only the new permanent flow valve of integral replacing, and cost is high.
In gas on-line analysis, other method is at the inner injector constant-current device that adopts of analyzer, utilizes injection atmospheric pressure and this body structure of injector to stablize sample flow.But injector needs external compressed air that injection gas is provided, particularly some explosion-proof scene can only be used as injection gas with compressed nitrogen.The consumption of pressurized air or nitrogen is large, is generally 1.5L/Min, and, to stablize injection atmospheric pressure and need to add stable-pressure device, this all can make the cost that maintains instrument operation improve.In addition,, because industrial sample gas dust is more, filtrator need to be installed in sample gas porch.Gas filter vapour lock is large, and the suction capactity of injector is limited, can cause constant current sampling difficulty when sample atmospheric pressure is low, so can only adopt low precision sample air filter, causes a large amount of dust particles to enter analysis air chamber, affects measurement result.
Summary of the invention
In view of this, the invention provides a kind of built-in constant current sampler.Fundamental purpose is to solve sampler sample flow in prior art and is subject to the influence of fluctuations of sample airshed large, and sample flow is unstable, and sample flow regulates the slow problem of reaction.
The built-in constant current sampler of one provided by the invention, comprise gas distributor and gas analysis air chamber, described gas distributor comprises: stopple coupon and a loudspeaker cavity, described loudspeaker cavity comprises: the first openend and the second openend, the internal diameter of described loudspeaker cavity reduces gradually along the direction of described the first openend to the second openend, described stopple coupon is arranged on the middle part of described loudspeaker cavity, and described stopple coupon is all communicated with described loudspeaker cavity and described gas analysis air chamber; When work, sample gas flows to the second openend along the first openend of described loudspeaker cavity, and sucks in described gas analysis air chamber by described stopple coupon part at the middle part of described loudspeaker cavity.
Further, described built-in adjustable constant flow sampler, also comprises: disc type vapour lock pipe, described disc type vapour lock pipe is connected between described stopple coupon and described gas analysis air chamber.
Further, described gas distributor also comprises: Powdex filter, described Powdex filter is sealed in described loudspeaker cavity the first openend.
Further, described built-in adjustable constant flow sampler, also comprise: the vibration pump that impact damper and a frequency are adjustable, described impact damper comprises the first surge chamber to the n surge chamber that order is communicated with, described n is more than or equal to 2 positive integer, described the first surge chamber is connected with described analysis cell, and described vibration pump is arranged on the communication path between arbitrary two adjacent surge chambers.
Further, described n=3, all adopts vapour lock pipe to connect between described adjacent buffer chamber.
Further, described gas distributor also comprises: gas outlet I and gas outlet II, described loudspeaker cavity the second openend, gas outlet I and gas outlet II order are communicated with, the diameter of described gas outlet I is greater than the diameter of described the first openend, the diameter of described gas outlet II is less than the diameter of described the first openend, and the gas output end of described the 3rd surge chamber is communicated with described gas outlet II.
Further, described vibration pump comprises: the pump housing, current potential.
Beneficial effect of the present invention: the gas sampling device sample flow adopting for existing on-line gas analysis device is unstable, is easily subject to the influence of fluctuations of sample airshed and the slow-footed problem of sampling flow governing response.The invention provides the stable constant current sampler that can be built-in of a kind of sample flow, the vapour lock relations of distribution, pressure buffer structure, electromagnetic oscillation pump suction and the front and back of apparatus of the present invention to secondary feedback flow regulation mechanism well the undue gassing of steady flow chamber flow and improved sampling flow governing response speed.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the structural representation of built-in adjustable constant flow sampler.
Fig. 2 is the structural representation of gas cushion and electromagnetic oscillation pump.
Embodiment
Below by specific embodiment, also the present invention is described in further detail by reference to the accompanying drawings.
Embodiment mono-: as shown in Figure 1, be the structural representation of built-in adjustable constant flow sampler.This sampler comprises gas distributor 1, vapour lock pipeline 12, analyze air chamber 13, gas cushion 20, electromagnetic oscillation pump 17, the entrance of disc type vapour lock pipeline 12 is connected with the stopple coupon 2 of gas distributor 1, and the outlet of vapour lock pipeline 12 is connected with the entrance of analyzing air chamber 13, the gas access 22 of gas cushion 20 is connected with the outlet of analyzing air chamber 13, and electromagnetic oscillation pump 17 is fixed on gas cushion 20 and is communicated with gas cushion 20.
The gas distributor 1 of this sampler comprises: pressing plate 3, filtrator 7, loudspeaker cavity 8, seat 9, gas outlet I 10, gas outlet II 11, powder of stainless steel filtrator 7 is sealed in described loudspeaker cavity 8 first openends by pressing plate 3, the second openend of loudspeaker cavity 8 is directly connected with gas outlet I 10, and the other end of gas outlet I 10 directly connects gas outlet II 11.
In the present embodiment, the bore of loudspeaker cavity 8 is designed to pre-large post-smallly, and small-bore one end connects gas outlet I 10, and stopple coupon 2 is positioned at the middle part of loudspeaker cavity 8.The front end of loudspeaker cavity 8 connects sample gas entrance, and pressure is larger, and front end bore can discharge rapidly greatly the pressure of sample gas porch, and rear end connects gas outlet I 10, and pressure is low, and rear end bore I, with the gas discharging speed that slows down, plays humidification.Stopple coupon 2 is positioned at the middle part of loudspeaker cavity 8, in the time of industrial sample atmospheric pressure fluctuation, basicly stable at the pressure of loudspeaker cavity 8 middles, can realize constant voltage sampling, for follow-up constant current is extracted ready.
In the present embodiment, the loudspeaker cavity 8 of gas distributor 1, gas outlet I 10 and gas outlet II 11 are directly connected, and vapour lock is little.The little vapour lock of bore of stopple coupon 2 is large, the sample gas that enters sample gas entrance 5 except a small amount of sample gas that constant current is extracted, remaining sample gas through gas outlet I 10 finally again via gas outlet II 11 dischargers outside.Can reduce sample flow is subject to industrial sample atmospheric pressure variable effect to such vapour lock relation on the one hand, and can accelerate on the other hand sample gas and discharge this device, thus the analyzing responding speed of quickening analytical instrument.If sampling is 1L/h for the flow of analyzing, the sample airshed that enters gas distributor is 100L/h, and the sample gas of 99L/h is discharged outside this device through gas outlet I 10.If the flow generation larger fluctuation that industrial sample gas enters gas distributor 1 because of pressure surge ambassador, as changed back and forth at 30L/h to 100L/h, the result that this vapour lock relations of distribution and constant current are extracted enters the flow of 1L/h to analyze air chamber 13 to be responded by sensor, and remaining gas is all discharged outside these devices via gas outlet I 10 and gas outlet II 11.
In the present embodiment, gas outlet II 11 relative aperture loudspeaker cavitys 8, gas outlet I 10 bores of gas distributor 1 are little, and it is large that vapour lock becomes.And gas outlet II 11 is connected with gas outlet 23 threeways of gas cushion 20.When this structure changes the flow of sample gas entrance 5, corresponding sensitive the changing of pressure of gas outlet II 11, after gas outlet 23 superchargings by gas cushion 20, buffering III chamber 19 pressure generation respective change, for flow feedback regulation ready.
Between stopple coupon 2 and analysis air chamber 13, be connected with disc type vapour lock pipeline 12, vapour lock pipeline 12 is the parts of vapour lock maximum in this device, and the high vapour lock of vapour lock pipeline can be isolated sample atmospheric pressure and be changed the impact on analyzing air chamber 13.
In the present embodiment, impact damper 20 comprises: buffering I chamber 14, buffering II chamber 16,19, three of III chambers of buffering surge chamber are by vapour lock pipe I 15, and vapour lock pipe II 18 connects successively.The gas access 22 of buffering I chamber 14 is connected with the outlet of analyzing air chamber 13, and the gas outlet 23 of buffering III chamber 19 is connected with 11 threeways of gas outlet II.
The drum-shaped lid of three surge chambers is crimped on substrate 21 with O-ring seal, and sealing place requires air tight.Three surge chambers all have larger cavity, and gas pressure change is carried out to smoothing buffer, and reducing pressure jump affects constant current sampling.Between three surge chambers, isolated by vapour lock pipe I 15, vapour lock pipe II 18, make that three surge chambers are relatively independent to be had pressure reduction and be interconnected again.
Connect electromagnetic oscillation pump 17 in buffering II chamber 16, buffering between III chamber 19, the entrance of electromagnetic oscillation pump 17 is connected with buffering II chamber 16, the outlet of electromagnetic oscillation pump 17 with cushion III chamber 19 and be connected.Gas access 22 vapour locks of gas cushion 20 are larger, can isolate that the pressure of electromagnetic oscillation pump 17 while carrying out flow regulation changes and the pressure of gas outlet II 11 changes the impact on analysis air chamber 13.Electromagnetic oscillation pump has the characteristic reducing with pump housing pressure at two ends increase suction flow, both can under 16 negative pressure of buffering II chamber, work, and also can, in buffering II chamber 16 direct draught work, that is to say, electromagnetic oscillation pump is vacuum pump, is again forcing pump.In addition, adopting the benefit of electromagnetic oscillation pump is to reach in the life-span more than 10 years, and the pump of driven by motor is due to rotating shaft and commutation brush wear, and the life-span only has 1～2 year.
In the present embodiment, be provided with filtrator 7 at loudspeaker cavity 8 first openends, filtrator 7 is fixed on loudspeaker cavity 8 first openend terminations by lid pressing plate 3 thereon, and pressing plate is fixing by tight lock screw 4.Pressing plate 3 is lined with O type rubber seal 6 with filtrator 7.In industrial gasses, generally contain a large amount of dust, sample gas need to filter and could be used for gas analysis through filtrator, can regularly unclamp lock-screw 4 and take out after powder of stainless steel filtrator 7 is changed or cleaned to powder of stainless steel filtrator 7 and reinstall use in the present embodiment.It is corrosion-resistant adopting the benefit of powder of stainless steel filtrator 7, to the low absorption of gas, recycling capable of washing.
In the present embodiment, all vapour lock pipelines curve coil pipe with stainless steel tubule and make, and the number of turns of vapour lock size increase and decrease coil pipe that can be is as required easily manufactured.
Interconnecting in the present embodiment between parts is that stainless steel cutting ferrule is threaded, and detachably any one component inspection is changed, and is convenient to safeguard.
Embodiment bis-: as shown in Figure 2, be the structural representation of gas cushion and electromagnetic oscillation pump.Electromagnetic oscillation pump 17 comprises: coil 27, pedestal 24, iron plate 25, the pump housing 26, with the driving circuit 29 of setting potentiometer 28, and iron plate 25 is fixed on pedestal 24, and the pump housing 26 is fixed on pedestal 24.The pump housing 26 is communicated with buffering II chamber 16 and buffering III chamber 19 respectively, and when work, coil 27 drives iron plate 25 to move up and down under driving circuit 29 effects, and iron plate 25 is drawn the gas of the pump housing 26 suction buffering II chambers 16 and buffering III chamber 19.
The vapour lock relations of distribution, pressure buffer structure and the front and back of apparatus of the present invention are to the secondary feedback flow regulation mechanism gas flow of the undue gassing of steady flow chamber 13 well.Pressure buffer is mainly realized by vapour lock pipe and gas cushion 20.
The constant current sampling mechanism of apparatus of the present invention is as follows: electromagnetic oscillation pump forced vibration under the effect of driving circuit, constant draft is provided, the gas that extracts buffering II chamber 16 enters buffering III chamber 19, make to cushion II chamber 16 and form negative pressure, buffering III chamber 19 forms malleation, the vapour lock pipe II 18 being simultaneously connected between buffering II chamber 16 and buffering III chamber 19 can form anti-stream, under the acting in conjunction of electromagnetic oscillation pump and vapour lock pipe II 18, finally can make the pressure reduction that cushions II chamber 16 and buffering III chamber 19 stablize, the flow of the flow that electromagnetic oscillation pump 17 aspirates and vapour lock pipe II 18 anti-streams reaches mobile equilibrium, be pressure reduction induction type flow regulation principle.After mobile equilibrium, the flow that flows through vapour lock pipe I 15 is also thereupon stable, and the flow that flows through analysis air chamber 13 is also just thereupon stable.In the time that the flow of this device sample gas entrance 5 or pressure change, under the regulating action of secondary feedback flow regulation mechanism, flow through the flow of analyzing air chamber 13 just well on the constant flow value of setting in the time of adjustment before and after following.Front and back are as follows to secondary feedback flow regulation mechanism Principles of Regulation:
When sample gas entrance 5 flows increase, will increase at the sample flow at stopple coupon 2 places thereupon, the adjustment process of generation is:
Backward adjusting---because gas outlet I 10 and gas outlet II 11 vapour locks of gas distributor 20 are little, the gas vent 23 of gas cushion 20 connects buffering III chamber 19 and gas outlet II 11, buffering III chamber 19 just can be responded to the variation of sample airshed fast, result buffering III chamber 19 pressure increase, electromagnetic oscillation pump 17 suction flows reduce, and this is first order feedback flow regulation mechanism; The flow that the vapour lock pipe II 18 of while between buffering II chamber 16 and buffering III chamber 19 returned to buffering II chamber 16 also increases, and this is second level feedback flow regulation mechanism.The result of two-stage feedback flow regulation is all to have reduced to flow through the flow of analyzing air chamber 13, until buffering II chamber 16 while not changing with sample gas entrance 5 flows of buffering II chamber 16 and the pressure reduction of buffering between III chamber 19 and to cushion III chamber 19 pressure reduction identical, flow regulation process finishes.
Forward direction regulates---and sample gas entrance 5 flows increase, and due to vapour lock pipeline 12 vapour lock maximums, sample flow will respond slower, but trend still can cause cushioning I chamber 14 and buffering II chamber 16 pressure increase, and also can make electromagnetic oscillation pump 17 suction flows reduce.Until buffering II chamber 16 while not changing with sample gas entrance 5 flows of buffering II chamber 16 and the pressure reduction of buffering between III chamber 19 and to cushion III chamber 19 pressure reduction identical, flow regulation process finishes.
After flow regulation finishes, when buffering II chamber 16 inflow buffering III chamber 19 flows and sample gas entrance 5 flows do not change, it is identical that buffering II chamber 16 flows into buffering III chamber 19 flows, this flow also equals to cushion I chamber 14 and flows into through vapour lock pipe I 15 flow that cushions II chamber 16, should be also to flow through the flow of analyzing air chamber 13.Buffering II chamber 16 flows into the flow of flow-vapour lock pipe II 18 anti-streams of buffering III chamber 19 flows=pump suction.
After flow regulation process finishes, the pressure of three surge chambers 14,16,19 all increases to some extent, makes to analyze the pressure differential maintain that air chamber 13 imports and exports constant, flows through that to analyze the gas flow of air chamber 13 constant.In the time that sample gas inlet flow rate reduces, the flow regulation process of device is contrary to the above, but result is to flow through that to analyze the constant flow of air chamber 13 constant equally.The vapour lock relations of distribution of apparatus of the present invention, pressure buffer structure, electromagnetic oscillation pump 17 aspirate and the flow regulation mechanism flow of the undue gassing of steady flow chamber 13 is well fed back to secondary in front and back.
In the present invention, the aspiration of electromagnetic oscillation pump 17 is determined by driving circuit 29, therefore need to give the preset parameter of setting potentiometer 28 of driving circuit 29, this parameter is the nominal value that analysis air chamber is analyzed required flow value.Established standards value in accordance with the following steps, is connected with large capacity meter by steel cylinder gas and receives sample gas entrance 5 of the present invention sample gas is provided, and small flowmeter is serially connected in to be analyzed between air chamber 13 outlets and the gas access 22 of gas cushion 20.Regulate the reduction valve on steel cylinder, making this device sample gas entrance 5 flows is the intermediate value of industrial sample gas scope, and large capacity meter indicates the size of this value.Regulate the potentiometer 28 on driving circuit 29, making small flowmeter indicated value is the nominal value that analysis air chamber is analyzed required flow value.Now, the setting value of the potentiometer 28 on driving circuit 29 is exactly the nominal value that analysis air chamber is analyzed required flow value.After adjustment finishes, sample gas entrance 5 connects sample gas, and electromagnetic oscillation pump provides constant draft under the effect of driving circuit.In the time that the flow of this device sample gas entrance changes, under the regulating action of secondary feedback flow regulation mechanism, flow through the flow of analyzing air chamber just well on constant flow value in the time of adjustment in front and back.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. a built-in constant current sampler, comprise gas distributor and gas analysis air chamber, it is characterized in that: described gas distributor comprises: stopple coupon and a loudspeaker cavity, described loudspeaker cavity comprises: the first openend and the second openend, the internal diameter of described loudspeaker cavity reduces gradually along the direction of described the first openend to the second openend, described stopple coupon is arranged on the middle part of described loudspeaker cavity, and described stopple coupon is all communicated with described loudspeaker cavity and described gas analysis air chamber; When work, sample gas flows to the second openend along the first openend of described loudspeaker cavity, and sucks in described gas analysis air chamber by described stopple coupon part at the middle part of described loudspeaker cavity.
2. built-in adjustable constant flow sampler as claimed in claim 1, is characterized in that: also comprise disc type vapour lock pipe, described disc type vapour lock pipe is connected between described stopple coupon and described gas analysis air chamber.
3. built-in adjustable constant flow sampler as claimed in claim 1, is characterized in that: described gas distributor also comprises: Powdex filter, described Powdex filter is sealed in described loudspeaker cavity the first openend.
4. the built-in adjustable constant flow sampler as described in any one in claim 1-3, it is characterized in that: also comprise: the vibration pump that impact damper and a frequency are adjustable, described impact damper comprises the first surge chamber to the n surge chamber that order is communicated with, described n is more than or equal to 2 positive integer, described the first surge chamber is connected with described analysis cell, and described vibration pump is arranged on the communication path between arbitrary two adjacent surge chambers.
5. built-in adjustable constant flow sampler as claimed in claim 4, is characterized in that: described n=3, all adopts vapour lock pipe to connect between described adjacent buffer chamber.
6. built-in adjustable constant flow sampler as claimed in claim 5, it is characterized in that: described gas distributor also comprises: gas outlet I and gas outlet II, described loudspeaker cavity the second openend, gas outlet I and gas outlet II order are communicated with, the diameter of described gas outlet I is greater than the diameter of described the first openend, the diameter of described gas outlet II is less than the diameter of described the first openend, and the gas output end of described the 3rd surge chamber is communicated with described gas outlet II.
7. built-in adjustable constant flow sampler as claimed in claim 4, is characterized in that: described vibration pump comprises: the pump housing, current potential.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410165892.0A CN103900863B (en) | 2014-04-23 | 2014-04-23 | A kind of built-in constant current sampler |
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| CN201410165892.0A CN103900863B (en) | 2014-04-23 | 2014-04-23 | A kind of built-in constant current sampler |
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| CN103900863B CN103900863B (en) | 2016-08-17 |
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Cited By (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 |
| CN109596395A (en) * | 2018-12-12 | 2019-04-09 | 浙江大学 | Online multiple spot gas-sample analysis system and test method under pipeline homeostasis |
| 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 |
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| DE1932862A1 (en) * | 1969-06-28 | 1971-01-07 | Perkin Elmer Ltd | Flow regulator arrangement |
| US5604319A (en) * | 1994-03-26 | 1997-02-18 | Horiba, Ltd., | Sampling device for gas analyzers |
| JP2003075308A (en) * | 2001-09-06 | 2003-03-12 | Tsukasa Sokken Co Ltd | Mini constant flow rate sampling apparatus |
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2014
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Patent Citations (4)
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| DE1932862A1 (en) * | 1969-06-28 | 1971-01-07 | Perkin Elmer Ltd | Flow regulator arrangement |
| US5604319A (en) * | 1994-03-26 | 1997-02-18 | Horiba, Ltd., | Sampling device for gas analyzers |
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Cited By (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 |
| CN109596395A (en) * | 2018-12-12 | 2019-04-09 | 浙江大学 | Online multiple spot gas-sample analysis system and test method under pipeline homeostasis |
| 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 |
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| CN103900863B (en) | 2016-08-17 |
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