CN101315315A - Single-pump double-gas path sampling device - Google Patents
Single-pump double-gas path sampling device Download PDFInfo
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- CN101315315A CN101315315A CNA2008101161429A CN200810116142A CN101315315A CN 101315315 A CN101315315 A CN 101315315A CN A2008101161429 A CNA2008101161429 A CN A2008101161429A CN 200810116142 A CN200810116142 A CN 200810116142A CN 101315315 A CN101315315 A CN 101315315A
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- sampler
- flow meter
- air
- membrane pump
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Abstract
The invention relates to a single-pump double air-course sampler used for collecting pollutants in indoor air, and belongs to the field of detecting pollutants in the air. The sampler comprises a time controller (5), a membrane pump (6), a current divider (7), a first flow meter (8) and a second flow meter (9). The current divider (7) is provided with two air inlets and an air outlet; the two air inlets are respectively connected with the first flow meter (8) and the second flow meter (9); the air outlet communicates with the membrane pump (6); the current divider (7) comprises a Y-shaped pipe (17); current dividing nuts and current dividing bolts are arranged on three pipelines of the Y-shaped pipe (17). The sampler has the advantages that (1) the membrane pump completes the task instead of the two membrane pumps in the traditional sampler; (2) the sampler has energy-saving effect, and the battery service life is one time longer than that of the traditional sampler; (3) the sampler has small volume and light weight.
Description
Technical field
The present invention relates to a kind of single-pump double-gas path sampling device, be used for gathering the pollutant of room air, belong to pollutant detection range in the air.
Background technology
At present, what China's room air sample collecting was mainly used is active double-gas path sampling device, its structure as shown in Figure 1: include membrane pump A 1, membrane pump B 2, flowmeter A 3, flowmeter B 4 and the time controller 5 that links to each other with two membrane pumps.The characteristics of this sampling thief are: 1) each membrane pump connects an air intake opening respectively; 2) two membrane pumps can be worked simultaneously, by two gas circuits difference collected specimens.But sampling thief has following shortcoming: 1) weight is bigger; 2) battery is shorter service time; 3) when each sampled point need be gathered 3 or 4 samples, then each sampled point need be laid two sampling thiefs, perhaps divides the two-wheeled collection, has wasted a large amount of time like this; 4) when utilizing this principle to make three gas circuits or four gas path sampling devices, just need corresponding 3 or 4 membrane pumps, this has just caused sampling thief bulky, and weight is bigger, and battery consumption will be faster also.
Summary of the invention
The objective of the invention is to overcome the above-mentioned defective of existing sampling thief, a kind of single-pump double-gas path sampling device is provided, this sampling thief has advantages such as volume is little, in light weight, saving electric energy.
In order to achieve the above object, the present invention has taked following technical scheme.Sampling thief among the present invention includes time controller, membrane pump, shunt, first flow meter and second flowmeter.Wherein: shunt has two air intake openings and a gas outlet, is connected with the first flow meter and second flowmeter on two air intake openings respectively, and the gas outlet is connected with membrane pump.
Described shunt is a Y-piece, all is provided with the branch flow bolt of shunting nut and matching with the shunting nut on three pipelines of Y-piece, is used for regulating the gas flow of each pipeline.
Advantage of the present invention is: 1) replaced two tasks that membrane pump can be finished in traditional sampling thief with a membrane pump; 2) this sampling thief has more energy-conservation effect, compares battery with the traditional sampling device and can prolong one times service time; 3) this sampling thief volume is little in light weight.
Description of drawings
Fig. 1 is the structural representation of traditional sampling device
Fig. 2 is a structural representation of the present invention
Fig. 3 is the diversion structure synoptic diagram
Among the figure: 1, membrane pump A, 2, membrane pump B, 3, flowmeter A, 4, flowmeter B, 5, time controller, 6, membrane pump, 7, shunt, 8, first flow meter, 9, second flowmeter, 11, the total points flow bolt, 12, first fen flow bolt, 13, second fens flow bolts, 14, always shunt nut, 15, the first shunting nut, 16, the second shunting nut, 17, Y-piece, 18, gas outlet, 19, first air intake opening, 20, second air intake opening.
Embodiment
The invention will be further described below in conjunction with accompanying drawing 2～Fig. 3:
As shown in Figure 2, present embodiment comprises membrane pump 6, shunt 7, first flow meter 8, second flowmeter 9 and time controller 5.The structure of shunt 7 comprises Y-piece 17, always shunts nut 14, total points flow bolt 11, first fen flow bolt 12, second fen flow bolt 13, the first shunting nut 15, the second shunting nut 16 as shown in Figure 3.Y-piece 17 is provided with first air intake opening 19, second air intake opening 20 and gas outlet 18.The pipeline at 18 places, gas outlet is provided with total shunting nut 14, always shunts nut 14 and matches with total points flow bolt 11, is used to adjust the gas flow on the air pipe.The pipeline at first air intake opening, 19 places is provided with the first shunting nut, 15, the first shunting nuts 15 and matches with first fen flow bolt 12, is used for regulating the gas flow of first air inlet pipeline.The pipeline at second air intake opening, 20 places is provided with the second shunting nut, 16, the second shunting nuts 16 and matches with second fen flow bolt 13, is used for regulating the gas flow of second air inlet pipeline.
The gas outlet 18 of Y-piece 17 links to each other with membrane pump 6 by silicone rubber tube, and first air intake opening 19 links to each other with first flow meter 8 by silicone rubber tube, and second air intake opening 20 links to each other with second flowmeter 9 by silicone rubber tube.Two gas passages have so just been formed.Connecting back energized sampling thief just can work.
The calibration of the sampling thief in the present embodiment:
1, the stability of sampling thief no-load condition down-off checking
With flow bolt 13 precessions in second fen, this gas circuit is interrupted.Simultaneously total points flow bolt 11, first fen flow bolt 12 screw out, and keep this gas circuit unobstructed.Power-on, the flow velocity of adjusting first flow meter 8 is 1.00L/min, then second fen flow bolt 13 being screwed out keeps clear the gas circuit at its place, and regulate first fen flow bolt 12 and second fen flow bolt 13 gradually, make the demonstration flow of first flow meter 8, second flowmeter 9 be 0.50L/min.Connecting soap film flowmeter then calibrates respectively.During calibration, with the actual gas flow Q in the soap film flowmeter measurement pipeline,
τ: soap-film is through V volume required time, and unit is: second
V: soap-film is through the volume between beginning, terminal point scale in the soap film flowmeter, and unit is: rise
The stability of sampling thief flow represents that with relative standard deviation RSD the computing formula of relative standard deviation is:
In the following formula: RSD: relative standard deviation
τ
i: the i time alignment time
τ: average calibration time
N: calibration number of times
Wherein: the setting flow is 0.5L/min, and calibrated fluxes is the gas flow Q in the measured actual pipeline of soap film flowmeter, and unit is: L/min;
Table 1 is to carry out the resulting data in calibration back in a period of time five times:
Table 1:
As can be seen from Table 1, error is very little between the setting flow of this sampling thief and the calibrated fluxes, less than 2%.The discharge stability of sampling thief is good in the different periods, RSD≤3.5 ‰.A in (we use the volume of soap film flowmeter to be 200mL in this experiment) table, B represent two gas circuits of this sampling thief when operation respectively.
2, sampling thief is in the checking of sampling situation down-off stability
The bubble absorption tube of 5mL phenol reagent absorption liquid and the air intake opening that activated carbon tube is connected to two flowmeters will be filled.Other step is described with 1.Gained the results are shown in Table 2.
Table 2 is that sampling thief carries out the resulting data in calibration back five times in a period of time under the sampling situation:
Table 2
Annotate: the alphabetical A in the table 2, the meaning of B representative are identical with table 1, and employed formula is also identical.
As can be seen from Table 2, this sampling thief error between the setting flow of gathering the gaseous sample city and calibrated fluxes is very little, less than 2%.The discharge stability of sampling thief is good in the different periods, RSD≤3.4 ‰.(we use the volume of soap film flowmeter to be 200mL in this experiment).
Claims (2)
1, single-pump double-gas path sampling device includes time controller (5); It is characterized in that: also include membrane pump (6), shunt (7), first flow meter (8) and second flowmeter (9); Wherein: shunt (7) has two air intake openings and a gas outlet, is connected with first flow meter (8) and second flowmeter (9) on two air intake openings respectively, and the gas outlet is connected with membrane pump (6).
2, single-pump double-gas path sampling device as claimed in claim 1 is characterized in that: described shunt (7) comprises Y-piece (17), the branch flow bolt that all is provided with the shunting nut and matches with the shunting nut on three pipelines of Y-piece (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101161429A CN101315315A (en) | 2008-07-04 | 2008-07-04 | Single-pump double-gas path sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101161429A CN101315315A (en) | 2008-07-04 | 2008-07-04 | Single-pump double-gas path sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101315315A true CN101315315A (en) | 2008-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101161429A Pending CN101315315A (en) | 2008-07-04 | 2008-07-04 | Single-pump double-gas path sampling device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010105161A1 (en) | 2009-03-12 | 2010-09-16 | Veltek Associates, Inc. | Air sampling system having inline flow control switch |
| CN101587053B (en) * | 2009-06-24 | 2010-12-08 | 苏州苏净仪器自控设备有限公司 | Double air channels sampling sensor |
| CN105021674A (en) * | 2015-07-28 | 2015-11-04 | 国网四川省电力公司电力科学研究院 | Verification method of gas humidity detector |
| US10139318B2 (en) | 2008-02-07 | 2018-11-27 | Veltek Associates, Inc. | System and method for air sampling in controlled environments |
| US11808674B2 (en) | 2008-02-07 | 2023-11-07 | Veltek Associates, Inc. | System and method for air sampling in controlled environments |
| US11971396B2 (en) | 2020-10-14 | 2024-04-30 | Veltek Associates, Inc. | Programmable logic controller-based system and user interface for air sampling controlled environments |
-
2008
- 2008-07-04 CN CNA2008101161429A patent/CN101315315A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10139318B2 (en) | 2008-02-07 | 2018-11-27 | Veltek Associates, Inc. | System and method for air sampling in controlled environments |
| US11454573B2 (en) | 2008-02-07 | 2022-09-27 | Veltek Associates, Inc. | Air sampling system |
| US11808674B2 (en) | 2008-02-07 | 2023-11-07 | Veltek Associates, Inc. | System and method for air sampling in controlled environments |
| WO2010105161A1 (en) | 2009-03-12 | 2010-09-16 | Veltek Associates, Inc. | Air sampling system having inline flow control switch |
| EP2406609A4 (en) * | 2009-03-12 | 2017-11-15 | Veltek Associates, INC. | Air sampling system having inline flow control switch |
| CN101587053B (en) * | 2009-06-24 | 2010-12-08 | 苏州苏净仪器自控设备有限公司 | Double air channels sampling sensor |
| CN105021674A (en) * | 2015-07-28 | 2015-11-04 | 国网四川省电力公司电力科学研究院 | Verification method of gas humidity detector |
| US11971396B2 (en) | 2020-10-14 | 2024-04-30 | Veltek Associates, Inc. | Programmable logic controller-based system and user interface for air sampling controlled environments |
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Open date: 20081203 |