CN103712833A - Ordinary pressure sampling device suitable for lower pressure environments in high altitude areas - Google Patents
Ordinary pressure sampling device suitable for lower pressure environments in high altitude areas Download PDFInfo
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- CN103712833A CN103712833A CN201410026275.2A CN201410026275A CN103712833A CN 103712833 A CN103712833 A CN 103712833A CN 201410026275 A CN201410026275 A CN 201410026275A CN 103712833 A CN103712833 A CN 103712833A
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Abstract
The invention relates to an ordinary pressure sampling device suitable for lower pressure environments in high altitude areas. The ordinary pressure sampling device comprises a sampling outer pipe, a sampling inner pipe, a T-junction, a pressure sensor and a vacuum pump, wherein the sampling outer pipe is L-shaped, a vertical branch port is formed in the bending part of a vertical pipe and a horizontal pipe of the L-shaped pipe, and a horizontal branch port is formed in an outlet of the horizontal pipe; the sampling inner pipe is a straight pipe, one end of the sampling inner pipe passes through the vertical branch port and stretches into the sampling outer pipe, and the other end of the sampling inner pipe is exposed outside the vertical branch port; three ports of the T-junction are respectively connected to the sampling inner pipe, an airflow inlet of an air analytic instrument and the pressure sensor; the pressure sensor is electrically connected to the vacuum pump; and an airflow inlet of the vacuum pump is connected to the horizontal branch port of the sampling outer pipe, and an airflow outlet of the vacuum pump is communicated with atmosphere. The ordinary pressure sampling device can be used for carrying out real time feedback and adjustment according to the change of pressure, so that local sampling environments are ordinary pressure so as to meet the requirements of normal operation of an atmospheric environmental monitoring instrument.
Description
Technical field
The present invention relates to a kind of gas sampling assembly, particularly about a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure.
Background technology
Approximately 1,980 ten thousand square kilometres of land surfaces more than whole world height above sea level 2000m, are roughly equal to the Chinese area of twice, and these high altitude localities are mainly distributed in Asia and South America.China western part and most areas, west and south height above sea level, up to more than 2000m, belong to high altitude localities.At present, the present situation of national ambient air quality makes each province all in the level monitoring, the especially monitoring to PM2.5 and precursor thereof that improve atmosphere quality.Yet high altitude localities air pressure is low, atmospheric density is little, its atmospheric environment situation has marked difference with mountain region, hills, basin, Plain, if conventional environment supervision instrument can cause in this direct use in class area, measurement data is inaccurate cannot normally monitor even at all.Therefore, ambient air quality monitoring is carried out in the whole country need to be applicable in high altitude localities configuration the sampling apparatus of environment under low pressure, Monitoring Data that such area is obtained is accurate, reliable, representative, can and the Monitoring Data of other geomorphologic subregions between carry out effective ratio pair.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure, this device can carry out Real-time Feedback adjusting according to the variation of pressure, making local sampling environment is normal pressure, to meet the normal requirements of one's work of conventional atmosphere environment supervision instrument.
For achieving the above object, the present invention by the following technical solutions: a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure, it is characterized in that, it comprises sampling outer tube, sampling inner tube, three-way connection, pressure transducer and vacuum pump; Described sampling outer tube is a L shaped pipe, arranges one vertical mouthful in the vertical tube of L shaped pipe and the bending place of horizontal tube, in the outlet of horizontal tube, one level is set and props up mouth; Described sampling inner tube is a straight tube, and its one end is stretched in described sampling outer tube through described vertical mouth, and the other end is exposed at the outside of described vertical mouth; Three interfaces of described three-way connection connect respectively air flow inlet and the described pressure transducer of described sampling inner tube, gas analysis instrument; Described pressure transducer is electrically connected to described vacuum pump; The airflow inlet of described vacuum pump connects the level of described sampling outer tube and props up mouth, and the air stream outlet of described vacuum pump is communicated with atmosphere.
Another technical scheme of the same inventive concept of the present invention is to prop up between mouth and the airflow inlet of described vacuum pump and set up a flowrate control valve in the level of described sampling outer tube, described pressure transducer is electrically connected to described flowrate control valve simultaneously, with the aperture by adjust flux operation valve, control flow, rather than by regulating the rotating speed of vacuum pump to control flow.
Described sampling outer tube adopts a groove type joint with sampling being connected of inner tube, vertical mouthful of described sampling outer tube is threaded connection in the groove of described groove type joint, and between the end of described vertical mouth and described groove type joint, be provided with an O type circle, O type circle described in described sampling inner tube hermetically passing, is plugged in described sampling outer tube.
Described sampling outer tube adopts glass material, and described three-way connection and groove type joint adopt polytetrafluoroethylmaterial material.
The length that described sampling inner tube stretches into described sampling outer tube is greater than 5 times of described sampling outer tube diameter.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention is by arranging sampling outer tube outward in sampling inner tube, manufactured local sampling environment, and by the air flow rate of pressure transducer feedback regulation sampling outer tube, the porch local pressure of inner tube of making to sample reaches normal pressure, therefore can to environment under low pressure, sample by normal pressure equipment.2, the sampling outer tube that the present invention uses and sampling inner tube are glass material, little to the adsorbability of gas, can guarantee to greatest extent that the gas sample that collects and component and the concentration of atmosphere have consistance.3, the present invention adopts sampling outer tube arm to be fixed sampling inner tube, avoids using fixed support in the inside and outside both sides of sampling outer tube, thereby has simplified the parts of package unit.4, the present invention uses highly sensitive pressure transducer, not only makes measurement scheme have higher sensitivity, and makes sampling apparatus volume little, lightweight, is easy to carry, mounts and dismounts.The present invention can be widely used in the normal pressure sampling process of high altitude localities environment under low pressure.
Accompanying drawing explanation
Fig. 1 is the first embodiment structural representation of the present invention;
Fig. 2 is sampling outer tube structure schematic diagram of the present invention;
Fig. 3 is the second embodiment structural representation of the present invention;
Fig. 4 is sampling outer tube of the present invention and employing inner tube connection diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment 1:
As shown in Figure 1 and Figure 2, the present embodiment comprises sampling outer tube 1, sampling inner tube 2, three-way connection 3, pressure transducer 4, flowrate control valve 5 and vacuum pump 6.
Sampling outer tube 1 is a L shaped pipe, the vertical tube of L shaped pipe is provided with one vertical mouthful 11(with direction shown in drawing with the bending place of horizontal tube), in the outlet of horizontal tube, be provided with a level and prop up mouthfuls 12, sampling inner tube 2 is a straight tube, the sampling interior position that approaches vertical tube 1/2 pipe range of outer tube 1 is stretched into through vertical mouthful 11 in its one end, and the other end is exposed at the outside of vertical mouthful 11.Sampling inner tube 2 is tightly connected with the junction employing of vertical mouthful 11, and the inner tube 2 that can guarantee like this to sample has more stable local sampling environment.
The first interface of three-way connection 3 connects sampling inner tube 2, second interface connects the air flow inlet (being represented by dotted lines in figure) of gas analysis instrument, the 3rd interface Bonding pressure sensor 4, pressure transducer 4 is electrically connected to flowrate control valve 5, and the air flow inlet of flowrate control valve 5 connects the level of sampling outer tube 1 and props up mouth 12.The air stream outlet of flowrate control valve 5 connects vacuum pump 6, and the air stream outlet of vacuum pump 5 is communicated with atmosphere.
In order to guarantee it is to get representational sample the current stabilization in the situation that, sampling inner tube 2 stretches into the length of vertical mouthful 11, and to reach 5 times of sampling outer tube 1 internal diameter above for good.
During the present embodiment work, vacuum pump 6 starts, extraneous environment under low pressure gas is drawn into sampling outer tube 1, the inner local sampling environment that forms of sampling outer tube 1, sampling inner tube 2 gathers gas sample from this local sampling environment, pressure transducer 4 can record the gaseous tension of sampling inner tube 2, and pressure signal is fed back to flowrate control valve 5, flowrate control valve 5 is according to real-time pressure signal adjust flux, until pressure transducer 4 records from sampling inner tube 2 pressure that enters gas analysis instrument, is normal pressure numerical value.Above-mentioned flowrate control valve 5 is the routine techniques that is adjusted to air-flow according to real-time pressure signal, does not repeat them here.
Embodiment 2:
As shown in Figure 2, the present embodiment is different from previous embodiment is that level that the air flow inlet of vacuum pump 6 is directly communicated with the outer tube 1 of sampling props up mouthfuls 12, pressure transducer 4 is electrically connected to vacuum pump 6, after the gaseous tension that pressure transducer 4 records sampling inner tube 2 through three-way connection, pressure signal is fed back to vacuum pump 6, and according to the rotating speed of real-time pressure signal adjusting vacuum pump 6, control sampling flow, until the pressure that pressure transducer 4 records from sampling inner tube 2 is normal pressure numerical value.
In above-described embodiment, sampling outer tube 1 can adopt glass material, and caliber is 20mm left and right, the about 400mm in long limit of its L-type, the about 100mm of minor face.The internal diameter of sampling outer tube 1 arm can be processed as required 6.4mm or 12.8mm(and be a bit larger tham 1/4 inch or 1/2 inch), arm outer wall cover turnbuckle, for fixed sample inner tube be connected subsequent components.
In above-described embodiment, three-way connection 3 can adopt polytetrafluoroethylmaterial material or other material.
In above-described embodiment, the connection of sampling outer tube 1 and sampling inner tube 2 can adopt a kind of spill joint 7(as shown in Figure 4).Vertical mouthful 11 of sampling outer tube 1 is connected with spill joint 7 by screw thread, and is provided with an O RunddichtringO 8 between the end of vertical mouthful 11 and spill joint 7, and sampling inner tube 2, through O RunddichtringO 8, is plugged in sampling outer tube 1.The material of spill joint 7 is teflon.
The present invention only describes with above-described embodiment; the structure of each parts, setting position and connection thereof all can change to some extent; on the basis of technical solution of the present invention; all improvement of indivedual parts being carried out according to the principle of the invention and equivalents, all should not get rid of outside protection scope of the present invention.
Claims (10)
1. a normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure, is characterized in that, it comprises sampling outer tube, sampling inner tube, three-way connection, pressure transducer and vacuum pump;
Described sampling outer tube is a L shaped pipe, arranges one vertical mouthful in the vertical tube of L shaped pipe and the bending place of horizontal tube, in the outlet of horizontal tube, one level is set and props up mouth; Described sampling inner tube is a straight tube, and its one end is stretched in described sampling outer tube through described vertical mouth, and the other end is exposed at the outside of described vertical mouth; Three interfaces of described three-way connection connect respectively air flow inlet and the described pressure transducer of described sampling inner tube, gas analysis instrument; Described pressure transducer is electrically connected to described vacuum pump; The airflow inlet of described vacuum pump connects the level of described sampling outer tube and props up mouth, and the air stream outlet of described vacuum pump is communicated with atmosphere.
2. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 1, it is characterized in that, described sampling outer tube adopts a groove type joint with sampling being connected of inner tube, vertical mouthful of described sampling outer tube is threaded connection in the groove of described groove type joint, and between the end of described vertical mouth and described groove type joint, be provided with an O type circle, O type circle described in described sampling inner tube hermetically passing, is plugged in described sampling outer tube.
3. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 1, is characterized in that, described sampling outer tube adopts glass material, and described three-way connection adopts polytetrafluoroethylmaterial material.
4. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 2, is characterized in that, described sampling outer tube adopts glass material, and described three-way connection and groove type joint adopt polytetrafluoroethylmaterial material.
5. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 1 or 2 or 3 or 4, is characterized in that, the length that described sampling inner tube stretches into described sampling outer tube is greater than 5 times of described sampling outer tube diameter.
6. a normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure, is characterized in that, it comprises sampling outer tube, sampling inner tube, three-way connection, pressure transducer, flowrate control valve and vacuum pump;
Described sampling outer tube is a L shaped pipe, arranges one vertical mouthful in the vertical tube of L shaped pipe and the bending place of horizontal tube, in the outlet of horizontal tube, one level is set and props up mouth; Described sampling inner tube is a straight tube, and vertical mouthful is stretched in described sampling outer tube described in its one end hermetically passing, and the other end is exposed at the outside of described vertical mouth; Three interfaces of described three-way connection connect respectively air flow inlet and the described pressure transducer of described sampling inner tube, gas analysis instrument; Described pressure transducer is electrically connected to described flowrate control valve; The air flow inlet of described flowrate control valve connects the level of described sampling outer tube and props up mouth, and the air stream outlet of described flowrate control valve connects the air flow inlet of described vacuum pump, and the air stream outlet of described vacuum pump is communicated with atmosphere.
7. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 6, it is characterized in that, described sampling outer tube adopts a groove type joint with sampling being connected of inner tube, vertical mouthful of described sampling outer tube is threaded connection in the groove of described groove type joint, and between the end of described vertical mouth and described groove type joint, be provided with an O type circle, O type circle described in described sampling inner tube hermetically passing, is plugged in described sampling outer tube.
8. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 6, is characterized in that, described sampling outer tube adopts glass material, and described three-way connection adopts polytetrafluoroethylmaterial material.
9. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as claimed in claim 7, is characterized in that, described sampling outer tube adopts glass material, and described three-way connection and groove type joint adopt polytetrafluoroethylmaterial material.
10. a kind of normal pressure sampling apparatus that is applicable to high altitude localities environment under low pressure as described in claim 6 or 7 or 8 or 9, is characterized in that, the length that described sampling inner tube stretches into described sampling outer tube is greater than 5 times of described sampling outer tube diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410026275.2A CN103712833B (en) | 2014-01-20 | 2014-01-20 | A kind of normal pressure sampling apparatus being applicable to high altitude localities environment under low pressure |
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| CN201410026275.2A CN103712833B (en) | 2014-01-20 | 2014-01-20 | A kind of normal pressure sampling apparatus being applicable to high altitude localities environment under low pressure |
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| CN103712833A true CN103712833A (en) | 2014-04-09 |
| CN103712833B CN103712833B (en) | 2016-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913353A (en) * | 2014-04-10 | 2014-07-09 | 北京大学 | Gas normal pressure sampling device suitable for vehicle-mounted measurement |
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| US5374400A (en) * | 1992-05-07 | 1994-12-20 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Two-stage gas measurement system |
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| CN201166619Y (en) * | 2008-03-11 | 2008-12-17 | 内蒙古西水创业股份有限公司 | Sampling device for gas analyzer |
| GB2451279A (en) * | 2007-07-26 | 2009-01-28 | Siemens Vai Metals Tech Ltd | Apparatus for gas sampling comprising an inert gas atmosphere in the region of the port |
| CN102564812A (en) * | 2010-12-13 | 2012-07-11 | 上海安彩智能技术有限公司 | Novel gas sampling probe |
| CN202420929U (en) * | 2011-11-24 | 2012-09-05 | 上海欧萨环境资源管理咨询有限公司 | Low flow constant pressure module and air sampler including same |
| CN202916136U (en) * | 2012-10-24 | 2013-05-01 | 中国石油化工股份有限公司 | Airtight sampling device |
| CN203178116U (en) * | 2013-04-01 | 2013-09-04 | 陆远 | Needle cylinder sampler |
-
2014
- 2014-01-20 CN CN201410026275.2A patent/CN103712833B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5374400A (en) * | 1992-05-07 | 1994-12-20 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Two-stage gas measurement system |
| GB2451279A (en) * | 2007-07-26 | 2009-01-28 | Siemens Vai Metals Tech Ltd | Apparatus for gas sampling comprising an inert gas atmosphere in the region of the port |
| CN201096667Y (en) * | 2007-10-22 | 2008-08-06 | 段景峰 | Adjustment and control device for keeping positive pressure at inlet |
| CN201166619Y (en) * | 2008-03-11 | 2008-12-17 | 内蒙古西水创业股份有限公司 | Sampling device for gas analyzer |
| CN102564812A (en) * | 2010-12-13 | 2012-07-11 | 上海安彩智能技术有限公司 | Novel gas sampling probe |
| CN202420929U (en) * | 2011-11-24 | 2012-09-05 | 上海欧萨环境资源管理咨询有限公司 | Low flow constant pressure module and air sampler including same |
| CN202916136U (en) * | 2012-10-24 | 2013-05-01 | 中国石油化工股份有限公司 | Airtight sampling device |
| CN203178116U (en) * | 2013-04-01 | 2013-09-04 | 陆远 | Needle cylinder sampler |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913353A (en) * | 2014-04-10 | 2014-07-09 | 北京大学 | Gas normal pressure sampling device suitable for vehicle-mounted measurement |
| CN103913353B (en) * | 2014-04-10 | 2016-04-13 | 北京大学 | A kind of gas normal pressure sampling apparatus being applicable to airborne measurement |
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| Publication number | Publication date |
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| CN103712833B (en) | 2016-03-23 |
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Granted publication date: 20160323 Termination date: 20190120 |