CN104122122B - Pressure stability sampling apparatus - Google Patents
Pressure stability sampling apparatus Download PDFInfo
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- CN104122122B CN104122122B CN201410373312.7A CN201410373312A CN104122122B CN 104122122 B CN104122122 B CN 104122122B CN 201410373312 A CN201410373312 A CN 201410373312A CN 104122122 B CN104122122 B CN 104122122B
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Abstract
The pressure stability sampling apparatus of the present invention, including sampling tube, pressure stability chamber, control system and gas-monitoring instrument, sampling tube is communicated in the air inlet in pressure stability chamber, pressure stability Qiang mono-tunnel connects multi-limbed tube, every arm is communicated in gas-monitoring instrument, the inlet end of sampling tube is sequentially provided with first-class gauge and current limiter, pressure stability chamber is connected with vacuum pump by breather line, breather line is installed second gauge and ratio adjusting valve, the pressure stability sampling apparatus of the present invention can make sample introduction pressure remain a definite value, ensure sample introduction repeatability, instrument internal pressure can be adjusted by pressure stability chamber and regulation device, instrument internal pressure is made to remain a definite value, aerial survey flying height environment must its when lower than this value, it need not be demarcated, thus realizing the uncertainty that aircraft brings pressure change to cause because of Level Change, the data accuracy of gas-monitoring instrument during raising aerial survey.
Description
Technical field
The present invention relates to a kind of voltage stabilizing sampling apparatus, particularly a kind of for aerial survey time voltage stabilizing sampling apparatus.
Background technology
In aerial survey, the concentration of gaseous sample is carried out gas-monitoring by usual operation analysis instrument, in order to the concentration of accurate analysis and measurement gas, must assure that sample introduction process has well repeatability (namely multiple repairing weld gas-monitoring result repeats degree), and steady pressure during sample introduction is to ensure that the essential condition of sample introduction repeatability, but in aerial survey, due to the change of flying height, changing in real time of ambient pressure brings difficulty to control sample introduction pressure.
The existing atmospheric ambient gas monitoring instrument for ground, it is possible to being placed in a specific environment (being usually set to 0.6 atmospheric pressure time on the ground), thus ensureing that instrument internal pressure is constant all the time, solving the stable problem of demarcation.But when aerial survey, during along with transporter height change, apply existing atmospheric ambient gas monitoring instrument and also can there is problems in that
1, during aerial survey, the pressure of sampling tube air inlet changes with transporter height change, changing in real time of ambient pressure brings difficulty to control sample introduction pressure, thus causing sample introduction poor repeatability, so samples measurements can be brought error, thus affecting gas-monitoring precision；
2, atmospheric ambient gas monitoring instrument needs to carry out gas-monitoring under a stable air pressure environment, and when instrument pressure comes and go, interior scalar quantity cannot be determined, affects gas-monitoring precision.
Summary of the invention
Present invention purpose is in that to solve current atmospheric ambient gas monitoring instrument sample introduction pressure transient when for aerial survey, and instrument pressure changes greatly, it is impossible to the technical problem of demarcation, and provides a kind of pressure stability sampling apparatus.
In order to complete present invention purpose, the application by the following technical solutions:
The pressure stability sampling apparatus of the present invention, including sampling tube, pressure stability chamber and gas monitoring instrument, described sampling tube is communicated in the air inlet in described pressure stability chamber, the escape pipe in described pressure stability chamber is communicated in described gas-monitoring instrument, the inlet end of described sampling tube is sequentially provided with first-class gauge and current limiter, described pressure stability chamber also has the port connecting regulation device, described regulation device includes second gauge, ratio adjusting valve, vacuum pump and PC, described pressure stability chamber is connected with described vacuum pump by breather line, described breather line is installed described second gauge and described ratio adjusting valve, described PC respectively with described first-class gauge, second gauge, ratio adjusting valve, current limiter and vacuum pump connect.
Current limiter of the present invention is ratio adjusting valve, and described ratio adjusting valve is connected with described PC.
The escape pipe of gas-monitoring instrument of the present invention is communicated in described vacuum pump, is provided with the 3rd effusion meter and regulates valve between described gas-monitoring instrument and vacuum pump, and described 3rd effusion meter is connected with described PC respectively with regulating valve.
It is also equipped with thermometer, drimeter between first-class gauge of the present invention and current limiter, described pressure stability chamber is also connected to effusion meter, drimeter and thermometer.
Second gauge of the present invention and ratio adjusting valve available quality flow controller are replaced.
PC of the present invention is also associated with alarm.
Current limiter of the present invention can also be metering hole or mass flow controller, and described mass flow controller is connected with described PC.
The pressure stability sampling apparatus of the present invention, sample introduction pressure can be made to remain a definite value by current limiter, ensure sample introduction repeatability, instrument internal pressure can be adjusted by pressure stability chamber and control system, instrument internal pressure is made to remain a definite value, thus realizing stable calibration value, during such aerial survey, the precision of gas-monitoring can be greatly improved.
In addition, the escape pipe of gas-monitoring instrument is communicated in vacuum pump, the flow that gas-monitoring instrument is discharged can be controlled by vacuum pump, control gas-monitoring instrument air pressure inside, pressure stability sampling apparatus many places are provided with effusion meter, drimeter and thermometer simultaneously, the effect monitoring air pressure inside in real time can be played, then the result recorded is sent to PC, is controlled air pressure inside by PC in real time.
Accompanying drawing explanation
Fig. 1 is the overall schematic of the pressure stability sampling apparatus of the present invention.
Detailed description of the invention
As shown in Figure 1, the pressure stability sampling apparatus of the present embodiment, including sampling tube 1, pressure stability chamber 2 and gas monitoring instrument 3, sampling tube 1 is communicated in the air inlet in pressure stability chamber 2, the escape pipe in pressure stability chamber 2 is communicated in gas-monitoring instrument 3 by multi-limbed tube, the a certain gas-monitoring instrument 3 of each branched pipe connection, the inlet end of sampling tube 1 is sequentially provided with first-class gauge 4 and current limiter 5, pressure stability chamber 2 also has the port connecting regulation device 6, regulation device 6 includes second gauge 7, ratio adjusting valve 8, vacuum pump 9 and PC 10, pressure stability chamber 2 is connected with described vacuum pump 9 by breather line, breather line is installed second gauge 7 and ratio adjusting valve 8, PC 10 respectively with first-class gauge 4, second gauge 7, ratio adjusting valve 8 and vacuum pump 9 connect, the escape pipe of gas-monitoring instrument 3 is communicated in vacuum pump 9, it is provided with the 3rd effusion meter 11 between gas-monitoring instrument 3 and vacuum pump 9 and regulates valve 12, described 3rd effusion meter 11 is connected with described PC 10 respectively with regulating valve 12.
Current limiter 5 in the present embodiment can be metering hole or mass flow controller, and current limiter 5 is connected with PC 10, is also equipped with thermometer, drimeter between first-class gauge 4 and current limiter 5, and pressure stability chamber 2 is also connected to effusion meter, drimeter and thermometer.
PC 10 of the present invention is also associated with alarm, and when the pressure that second gauge 7 records is significantly greater than the numerical value of first-class gauge 4, PC 10 can start alarm, and watchful staff overhauls gas-monitoring sampling apparatus.
The second gauge 7 of the present embodiment and ratio adjusting valve 8 available quality flow controller are replaced.
The using method of above-mentioned pressure stability sampling apparatus is: when carrying out aerial survey, by the air inlet of sampling tube just to air-flow, operation along with transporter, injection port wind speed increases, air flow rate increases, the pressure at current limiter 5 place improves constantly, but when wind speed brings up to a certain degree, the pressure at current limiter 5 place can stop rising and being in a definite value, such sample introduction pressure remains unchanged, pressure stability chamber can be entered by after current limiter 5 at air-flow, pressure stability chamber 2 can be passed through and reduce impact on gas-monitoring instrument gas-monitoring precision during the change of sample introduction pressure, ensure that sample introduction repeatability, improve gas-monitoring precision.Furthermore, it is possible to adjust sampling apparatus internal pressure by regulation device, concrete grammar is as follows:
Before transporter runs, atmospheric ambient gas monitoring instrument air pressure inside is set as calibration value, it is usually set to 0.6 atmospheric pressure, when transporter runs, along with transporter raises, sampling tube 1 injection port wind speed increases, air flow rate increases, the pressure at current limiter place improves constantly, but when wind speed brings up to a certain degree, according to venturi theorem, the pressure at current limiter 5 place can stop rising and being in a definite value, simultaneously, the first-class gauge 4 at sampling tube injection port place, thermometer and drimeter, second gauge 7, 3rd effusion meter 11, effusion meter on pressure stability chamber 2, the numerical value recorded is transferred to PC 10 by drimeter and thermometer constantly, PC 10 is according to numerical control vacuum pump 9 pressure release recorded, control current limiter 5 and control injection port pressure, make the pressure within sampling apparatus, the pressure at sampling tube 1 injection port place is equal with calibration value, thus ensureing gas-monitoring degree of accuracy.
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (6)
1. a pressure stability sampling apparatus, including sampling tube (1), pressure stability chamber (2) and gas monitoring instrument (3), described sampling tube (1) is communicated in the air inlet of described pressure stability chamber (2), it is characterized in that: the escape pipe of described pressure stability chamber (2) is communicated in described gas-monitoring instrument (3) by multi-limbed tube, the inlet end of described sampling tube (1) is sequentially provided with first-class gauge (4) and current limiter (5), described pressure stability chamber (2) also has the port of connection regulation device (6), described regulation device (6) includes second gauge (7), ratio adjusting valve (8), vacuum pump (9) and PC (10), described pressure stability chamber (2) is connected with described vacuum pump (9) by breather line, described breather line is installed described second gauge (7) and described ratio adjusting valve (8), described PC (10) respectively with described first-class gauge (4), second gauge (7), ratio adjusting valve (8), current limiter (5) and vacuum pump (9) connect.
2. pressure stability sampling apparatus as claimed in claim 1, it is characterized in that: the escape pipe of described gas-monitoring instrument (3) is communicated in described vacuum pump (9) by multi-limbed tube, being provided with the 3rd effusion meter (11) between described gas-monitoring instrument (3) and vacuum pump (9) and regulate valve (12), described 3rd effusion meter (11) is connected with described PC (10) respectively with regulating valve (12).
3. pressure stability sampling apparatus as claimed in claim 2, it is characterized in that: be also equipped with thermometer, drimeter between described first-class gauge (4) and current limiter (5), described pressure stability chamber (2) is also connected to effusion meter, drimeter and thermometer.
4. pressure stability sampling apparatus as claimed in claim 3, it is characterised in that: described second gauge (7) and ratio adjusting valve (8) are replaced with mass flow controller.
5. pressure stability sampling apparatus as claimed in claim 4, it is characterised in that: described PC (10) is also associated with alarm.
6. pressure stability sampling apparatus as claimed in claim 1, it is characterised in that: described current limiter (5) is metering hole or mass flow controller, and described mass flow controller is connected with described PC (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410373312.7A CN104122122B (en) | 2014-07-31 | 2014-07-31 | Pressure stability sampling apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410373312.7A CN104122122B (en) | 2014-07-31 | 2014-07-31 | Pressure stability sampling apparatus |
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| CN104122122A CN104122122A (en) | 2014-10-29 |
| CN104122122B true CN104122122B (en) | 2016-06-29 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105651854B (en) * | 2016-03-15 | 2019-05-24 | 中国原子能科学研究院 | One kind is micro in aged samples containing tritium3The system and method for He quantitative determination |
| CN106556676A (en) * | 2016-10-27 | 2017-04-05 | 中法渤海地质服务有限公司 | A kind of detection means and detection method for multi-channel gas |
| CN106681383B (en) * | 2017-01-23 | 2023-07-28 | 中国科学院理化技术研究所 | High-precision pressure control device |
| TWI654415B (en) * | 2017-08-25 | 2019-03-21 | 大陸商賽默飛世爾（上海）儀器有限公司 | Fluid sampling device |
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