CN104122122A - Pressure stabilizing sampling device - Google Patents
Pressure stabilizing sampling device Download PDFInfo
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- CN104122122A CN104122122A CN201410373312.7A CN201410373312A CN104122122A CN 104122122 A CN104122122 A CN 104122122A CN 201410373312 A CN201410373312 A CN 201410373312A CN 104122122 A CN104122122 A CN 104122122A
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- pressure stabilizing
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Abstract
The invention discloses a pressure stabilizing sampling device. The pressure stabilizing sampling device comprises a sampling pipe, a pressure stabilizing cavity, a control system and a gas monitoring meter; the sampling pipe is communicated with a gas inlet of the pressure stabilizing cavity; one way of the pressure stabilizing cavity is connected with multiple branch pipes; each branch pipe is communicated with the gas monitoring meter; the gas charge end of the sampling pipe is sequentially provided with a first flow rate meter and a flow limiting device; the pressure stabilizing cavity is connected with the vacuum pump by a gas introducing pipeline; the gas introducing pipeline is provided with a second flow rate meter and a proportion regulating valve. The pressure stabilizing sampling device provided by the invention can enable the sample charge pressure to be kept at a constant value so as to guarantee the sample charge repeatability; the internal pressure of an instrument can be regulated by the pressure stabilizing cavity and a regulating device, so that the pressure intensity in the instrument keeps a constant value; the aerial survey flight height environment requires that calibration is not necessary in the condition of being lower than the constant value, so that the uncertainty caused by pressure change due to the height change of an aircraft is reached, and the data precision of the gas monitoring instrument in aerial survey is improved.
Description
Technical field
The present invention relates to a kind of voltage stabilizing sampling apparatus, particularly a kind of voltage stabilizing sampling apparatus during for aerial survey.
Background technology
In aerial survey, conventionally operation analysis instrument carries out gas-monitoring to the concentration of gaseous sample, for can accurate analysis and the concentration of measurement gas, must guarantee that sample introduction process has good repeatability (repeatedly sample gas monitoring result repeats degree), and steady pressure during sample introduction is the essential condition of guaranteeing sample introduction repeatability, but in aerial survey, due to the variation of flying height, the real-time change of ambient pressure has brought difficulty to control sample introduction pressure.
The existing atmospheric environment gas-monitoring instrument for ground, can be placed in a specific environment (on the ground time be generally set as 0.6 atmospheric pressure), thereby guarantee that instrument internal pressure is constant all the time, has solved the stable problem of demarcating.But when aerial survey, during along with transporter height change, apply existing atmospheric environment gas-monitoring instrument and also can have following problem:
1, the pressure at sampling pipe air inlet place changes with transporter height change during aerial survey, the real-time change of ambient pressure has brought difficulty to control sample introduction pressure, thereby cause sample introduction poor repeatability, can bring error to sampled measurements result like this, thereby affect gas-monitoring precision;
2, atmospheric environment gas-monitoring instrument need 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
The application's goal of the invention is to solve current atmospheric environment gas-monitoring instrument sample introduction pressure transient when for aerial survey, and instrument pressure changes greatly, the technical matters that cannot demarcate, and a kind of pressure stability sampling apparatus is provided.
In order to complete the application's goal of the invention, the application by the following technical solutions:
Pressure stability sampling apparatus of the present invention, comprise sampling pipe, pressure stability chamber and gas monitoring instrument, described sampling pipe is communicated in the air intake opening 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 pipe is provided with first flow meter and restrictor successively, described pressure stability chamber also has the port that connects regulation device, described regulation device comprises the second flowmeter, ratio adjusting valve, vacuum pump and PC, described pressure stability chamber is connected with described vacuum pump by breather line, described the second flowmeter and described ratio adjusting valve are installed on described breather line, described PC respectively with described first flow meter, the second flowmeter, ratio adjusting valve, restrictor is connected with vacuum pump.
Restrictor 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 flowmeter and variable valve between described gas-monitoring instrument and vacuum pump, and described the 3rd flowmeter is connected with described PC respectively with variable valve.
Between first flow meter of the present invention and restrictor, thermometer, hygrometer are also installed, described pressure stability is also connected with flowmeter, hygrometer and thermometer on chamber.
The second flowmeter of the present invention and ratio adjusting valve available quality flow controller are replaced.
PC of the present invention is also connected with alarm.
Restrictor of the present invention can be also metering hole or mass flow controller, and described mass flow controller is connected with described PC.
Pressure stability sampling apparatus of the present invention, by restrictor, can make sample introduction pressure remain a definite value, assurance sample introduction repeatability, by pressure stability chamber and control system, can adjust instrument internal pressure, make instrument internal pressure remain a definite value, thereby realize stable calibration value, the precision of gas-monitoring can improve greatly during aerial survey like this.
In addition, the escape pipe of gas-monitoring instrument is communicated in vacuum pump, can control the flow that gas-monitoring instrument is discharged by vacuum pump, control gas-monitoring instrument air pressure inside, pressure stability sampling apparatus many places are provided with flowmeter, hygrometer and thermometer simultaneously, can play the effect of Real-Time Monitoring air pressure inside, then the result recording be sent to PC, by PC, control in real time air pressure inside.
Accompanying drawing explanation
Fig. 1 is the overall schematic of pressure stability sampling apparatus of the present invention.
Embodiment
As shown in Figure 1, the pressure stability sampling apparatus of the present embodiment, comprise sampling pipe 1, pressure stability chamber 2 and gas monitoring instrument 3, sampling pipe 1 is communicated in the air intake opening in pressure stability chamber 2, the escape pipe in pressure stability chamber 2 is communicated in gas-monitoring instrument 3 by multi-limbed tube, each take-off pipe is communicated with a certain gas-monitoring instrument 3, the inlet end of sampling pipe 1 is provided with first flow meter 4 and restrictor 5 successively, pressure stability chamber 2 also has the port that connects regulation device 6, regulation device 6 comprises the second flowmeter 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, the second flowmeter 7 and ratio adjusting valve 8 are installed on breather line, PC 10 respectively with first flow meter 4, the second flowmeter 7, ratio adjusting valve 8 is connected with vacuum pump 9, the escape pipe of gas-monitoring instrument 3 is communicated in vacuum pump 9, between gas-monitoring instrument 3 and vacuum pump 9, be provided with the 3rd flowmeter 11 and variable valve 12, described the 3rd flowmeter 11 is connected with described PC 10 respectively with variable valve 12.
Restrictor 5 in the present embodiment can be metering hole or mass flow controller, restrictor 5 is connected with PC 10, between first flow meter 4 and restrictor 5, thermometer, hygrometer are also installed, on pressure stability chamber 2, are also connected with flowmeter, hygrometer and thermometer.
PC 10 of the present invention is also connected with alarm, and when the pressure recording when the second flowmeter 7 is obviously greater than the numerical value of first flow meter 4, PC 10 can start alarms, and watchful staff overhauls gas-monitoring sampling apparatus.
Second flowmeter 7 of the present embodiment and ratio adjusting valve 8 available quality flow controllers are replaced.
The using method of above-mentioned pressure stability sampling apparatus is: while carrying out aerial survey, by the air inlet of sampling pipe over against air-flow, operation along with transporter, injection port wind speed increases, air flow rate increases, the pressure at restrictor 5 places improves constantly, but when wind speed is brought up to a certain degree, the pressure at restrictor 5 places can stop rising and in a definite value, sample introduction pressure remains unchanged like this, after air-flow is by restrictor 5, can enter pressure stability chamber, impact on gas-monitoring instrument gas-monitoring precision in the time of can reducing the variation of sample introduction pressure by pressure stability chamber 2, guaranteed sample introduction repeatability, improve gas-monitoring precision.In addition, can adjust sampling apparatus internal pressure by regulation device, concrete grammar is as follows:
Before transporter operation, atmospheric environment gas-monitoring instrument air pressure inside is set as to calibration value, generally be set as 0.6 atmospheric pressure, when transporter moves, along with transporter raises, sampling pipe 1 injection port wind speed increases, air flow rate increases, the pressure at restrictor place improves constantly, but when wind speed is brought up to a certain degree, known according to venturi theorem, the pressure at restrictor 5 places can stop rising and in a definite value, simultaneously, the first flow meter 4 at sampling pipe injection port place, thermometer and hygrometer, the second flowmeter 7, the 3rd flowmeter 11, flowmeter on pressure stability chamber 2, hygrometer and thermometer are transferred to PC 10 constantly by the numerical value recording, PC 10 is according to Numerical Control vacuum pump 9 pressure releases that record, control restrictor 5 and control injection port pressure, make the pressure of sampling apparatus inside, the pressure at sampling pipe 1 injection port place equates with calibration value, thereby guarantee gas-monitoring degree of accuracy.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (6)
1. a pressure stability sampling apparatus, comprise sampling pipe (1), pressure stability chamber (2) and gas monitoring instrument (3), described sampling pipe (1) is communicated in the air intake opening in described pressure stability chamber (2), it is characterized in that: the escape pipe in described pressure stability chamber (2) is communicated in described gas-monitoring instrument (3) by multi-limbed tube, the inlet end of described sampling pipe (1) is provided with first flow meter (4) and restrictor (5) successively, described pressure stability chamber (2) also has the port of connection regulation device (6), described regulation device (6) comprises the second flowmeter (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 the second flowmeter (7) and described ratio adjusting valve (8) are installed on described breather line, described PC (10) respectively with described first flow meter (4), the second flowmeter (7), ratio adjusting valve (8), restrictor (5) is connected with vacuum pump (9).
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, between described gas-monitoring instrument (3) and vacuum pump (9), be provided with the 3rd flowmeter (11) and variable valve (12), described the 3rd flowmeter (11) is connected with described PC (10) respectively with variable valve (12).
3. pressure stability sampling apparatus as claimed in claim 2, it is characterized in that: between described first flow meter (4) and restrictor (5), thermometer, hygrometer are also installed, on described pressure stability chamber (2), are also connected with flowmeter, hygrometer and thermometer.
4. pressure stability sampling apparatus as claimed in claim 3, is characterized in that: described the second flowmeter (7) and ratio adjusting valve (8) available quality flow controller are replaced.
5. pressure stability sampling apparatus as claimed in claim 4, is characterized in that: described PC (10) is also connected with alarm.
6. pressure stability sampling apparatus as claimed in claim 1, is characterized in that: described restrictor (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 |
Applications Claiming Priority (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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| CN104122122A true CN104122122A (en) | 2014-10-29 |
| CN104122122B CN104122122B (en) | 2016-06-29 |
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| CN201410373312.7A Active CN104122122B (en) | 2014-07-31 | 2014-07-31 | Pressure stability sampling apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651854A (en) * | 2016-03-15 | 2016-06-08 | 中国原子能科学研究院 | System and method for quantitatively determining trace <3>He in tritium-containing aging sample |
| 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 |
| CN106681383A (en) * | 2017-01-23 | 2017-05-17 | 中国科学院理化技术研究所 | High-precision pressure control device |
| CN109425514A (en) * | 2017-08-25 | 2019-03-05 | 赛默飞世尔（上海）仪器有限公司 | fluid sampling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651854A (en) * | 2016-03-15 | 2016-06-08 | 中国原子能科学研究院 | System and method for quantitatively determining trace <3>He in tritium-containing aging sample |
| 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 |
| CN106681383A (en) * | 2017-01-23 | 2017-05-17 | 中国科学院理化技术研究所 | High-precision pressure control device |
| 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 |
| CN109425514A (en) * | 2017-08-25 | 2019-03-05 | 赛默飞世尔（上海）仪器有限公司 | fluid sampling device |
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| Publication number | Publication date |
|---|---|
| CN104122122B (en) | 2016-06-29 |
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