CN110702475A - Gas sampling device and gas sampling method - Google Patents
Gas sampling device and gas sampling method Download PDFInfo
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- CN110702475A CN110702475A CN201911171119.4A CN201911171119A CN110702475A CN 110702475 A CN110702475 A CN 110702475A CN 201911171119 A CN201911171119 A CN 201911171119A CN 110702475 A CN110702475 A CN 110702475A
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- 238000005070 sampling Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 17
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 aldehyde ketone Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Molecular Biology (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a gas sampling device and a gas sampling method, wherein the gas sampling device comprises a negative pressure gas path and a plurality of branch gas paths; the negative pressure gas circuit includes the vacuum pump that concatenates through the air duct from first end to second end, vacuum buffer tank and total control valve, be provided with the atmospheric pressure detector on the vacuum buffer tank, the atmospheric pressure detector is used for detecting the inside atmospheric pressure of vacuum buffer tank, each branch's gas circuit includes branch road switching valve and the gas flow rate monitoring mechanism that concatenates through the air duct from first end to second end, the first end of each branch's gas circuit communicates with the second end of negative pressure gas circuit respectively, the second end of each branch's gas circuit is used for connecting gas sample collection pipe respectively. The negative pressure suction is uniformly provided through the negative pressure gas circuit, each branch gas circuit can be independently controlled, the sampling mode is flexible, the sampling of a plurality of samples can be simultaneously carried out, the sampling efficiency is greatly improved, or the parallel sampling of the same sample is simultaneously carried out, so that the consistency of the parallel sample is improved, and the environmental error is reduced.
Description
Technical Field
The invention relates to the field of gas detection, in particular to a gas sampling device and a gas sampling method.
Background
China is a large country for automobile production and consumption, and automobile reserves are in the forefront of the world. At present, the problem that harmful gas in an automobile exceeds standard is more prominent, so that the automobile industry pays high attention to sampling and detecting the gas in the automobile. The VOC test standard of most automobile factories needs to carry out parallel tests on the determination of benzene series substances and aldehyde ketone substances, the traditional gas sampling device needs to sample for many times, the operation is more complicated, and the parallel data have larger deviation if the sampling is carried out for many times at different times.
Disclosure of Invention
Therefore, it is necessary to provide a gas sampling device and a gas sampling method to solve the problems of complicated operation and large deviation of parallel data caused by the fact that the conventional gas sampling device needs to perform sampling successively and repeatedly.
A gas sampling device comprises a negative pressure gas path and a plurality of branch gas paths; the negative pressure gas circuit comprises a vacuum pump, a vacuum buffer tank and a master control valve which are connected in series through gas guide tubes from a first end to a second end, the negative pressure gas circuit further comprises a gas pressure detector, the gas pressure detector is used for detecting the gas pressure of the negative pressure gas circuit, each branch gas circuit comprises a branch opening and closing valve and a gas flow rate monitoring mechanism which are connected in series through the gas guide tubes from the first end to the second end, the first end of each branch gas circuit is communicated with the second end of the negative pressure gas circuit, and the second end of each branch gas circuit is used for being connected with a gas sample collecting tube.
In one embodiment, the gas flow rate monitoring mechanism comprises a needle valve and a mass flow meter connected in series.
In one embodiment, at least one of the branch gas paths is further provided with a first solid impurity filter disposed at a side of the gas flow rate monitoring mechanism near the second end of the branch gas path.
In one embodiment, the number of the branch gas paths is 2-6.
In one embodiment, the air pressure detector is disposed on the vacuum buffer tank.
In one embodiment, the volume of the vacuum buffer tank is 10L-1000L.
In one embodiment, the vacuum buffer tank is connected with an emptying valve and a second solid impurity filter, and the emptying valve and the second solid impurity filter are connected in series through a gas guide pipe.
In one embodiment, the gas sampling device further includes a controller, the controller is electrically connected to the gas pressure detector and the vacuum pump, when the gas pressure value detected by the gas pressure detector is below a set value, the controller controls the vacuum pump to operate, and when the gas pressure value detected by the gas pressure detector reaches the set value, the controller controls the vacuum pump to stop operating.
In one embodiment, the controller is further electrically connected to the master control valve, the branch opening and closing valves on the plurality of branch gas paths, and the gas flow rate monitoring mechanism, and when the gas pressure value detected by the gas pressure detector reaches a set value, the controller controls the master control valve and the branch opening and closing valves on the branch gas paths to be sampled to be opened, and adjusts the gas flow rate monitoring mechanisms on the corresponding branch gas paths until the gas flow rate reaches the set value.
A gas sampling method using the gas sampling apparatus of any one of the above embodiments, the gas sampling method comprising the steps of:
second ends of the plurality of branch gas paths are respectively connected with a gas sample collecting pipe, and the gas sample collecting pipe is arranged in a space or a container needing to collect gas;
closing the master control valve, and starting the vacuum pump to stabilize the air pressure of the negative pressure air path within a set air pressure range;
opening the master control valve and the branch opening and closing valves on the branch gas paths to be sampled;
adjusting the gas flow rate monitoring mechanism until the gas flow rate reaches a set flow rate value.
Compared with the prior art, the gas sampling device and the gas sampling method have the following beneficial effects:
the gas sampling device and the gas sampling method comprise the negative pressure gas circuit and the plurality of branch gas circuits, negative pressure suction is uniformly provided through the negative pressure gas circuit, each branch gas circuit can be independently controlled, the sampling mode is flexible, the sampling of a plurality of samples can be simultaneously carried out, the sampling efficiency is greatly improved, or the parallel sampling of the same sample is simultaneously carried out, so that the consistency of the parallel samples is improved, and the environmental error is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a gas sampling apparatus according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a gas sampling apparatus 10 according to an embodiment of the present invention includes a negative pressure gas path and a plurality of branch gas paths.
The negative pressure air path comprises a vacuum pump 110, a vacuum buffer tank 120 and a master control valve 130 which are connected in series through an air duct from the first end to the second end. The negative pressure gas circuit further comprises a gas pressure detector 140, and the gas pressure detector 140 is used for detecting the gas pressure of the negative pressure gas circuit.
Each branch gas circuit comprises a branch opening and closing valve 210 and a gas flow rate monitoring mechanism which are connected in series through a gas guide tube from the first end to the second end. The first end of each branch gas circuit is communicated with the second end of the negative pressure gas circuit, and the second end of each branch gas circuit is used for being connected with a gas sample collecting pipe.
The gas flow rate monitoring mechanism includes a needle valve 220 and a mass flow meter 230 connected in series. The needle valve 220 is used to adjust the gas flow rate at the time of sampling. In one example, the needle valve 220 may be adjustable in a range of 100mL/min to 2000 mL/min. The mass flow meter 230 is used to display the gas flow rate and the accumulated gas volume.
The vacuum pump 110 is used to ensure the negative pressure of the system, and may be selected from, but not limited to, a diaphragm vacuum pump 110, an oil-free vacuum pump 110, a rotary vane vacuum pump 110, and the like. In one example, the vacuum of the vacuum pump 110 is less than 10kPa, and the pumping speed is greater than 5L/min.
In one example, the at least one branched gas path is further provided with a first solid impurity filter 240, and the first solid impurity filter 240 is disposed at a side of the gas flow rate monitoring mechanism near the second end of the branched gas path. The first solid impurity filter 240 is used to prevent solid impurities from entering the branch gas path, so as to prevent the solid impurities from depositing in the branch gas path and even in the negative pressure gas path to damage the gas sampling device 10.
In the specific example shown in fig. 1, each of the branched gas paths is provided with a first solid impurity filter 240.
The plurality of branch gas circuits on the gas sampling device 10 can perform parallel sampling test on the same sample, and can also perform sampling test on different samples at the same time. In one example, the gas sampling apparatus 10 has 2-6 branch gas paths in the specific example shown in FIG. 1, the gas sampling apparatus 10 has 4 branch gas paths. It is understood that in other examples, the gas sampling apparatus 10 may have more branch gas paths, such as 8, 10, etc.
In one example, the air pressure detector 140 is disposed at the vacuum buffer tank 120 for detecting the internal air pressure of the vacuum buffer tank 120.
The vacuum surge tank 120 is connected to a blow-off valve 122 and a second solid contaminant filter 124. The atmospheric valve 122 and the second solid impurity filter 124 are connected in series to the vacuum buffer tank 120 through an air duct. In the particular example shown in FIG. 1, the blow valve 122 is located between the vacuum surge tank 120 and the second solid impurity filter 124.
When the vacuum pump 110 is started, the air release valve 122 is closed, so that a negative pressure is formed inside the vacuum buffer tank 120. After the sampling is finished, the atmospheric valve 122 is opened to evacuate the system negative pressure.
The second solid impurity filter 124 is used to prevent solid impurities from entering the vacuum buffer tank 120, so as to prevent the solid impurities from depositing in the negative pressure gas path and causing damage to the gas sampling apparatus 10.
The vacuum buffer tank 120 has a large volume, and can perform the functions of pressure buffering and stabilizing the air pressure in the negative pressure air path. In one example, the vacuum buffer tank 120 has a volume of 10L to 1000L. Further, in one example, the volume of the vacuum buffer tank 120 is 100L-800L. In some specific examples, the vacuum buffer tank 120 has a volume of 200L, 400L, 600L, 900L.
In one example, the gas sampling apparatus 10 further comprises a controller electrically connected to the gas pressure detector 140 and the vacuum pump 110. The air pressure detector 140 can transmit the detected air pressure value to the controller. When the air pressure detected by the air pressure detector 140 is below the set value, the controller controls the vacuum pump 110 to operate, and when the air pressure detected by the air pressure detector 140 reaches the set value, the controller controls the vacuum pump 110 to stop operating. Therefore, the controller controls the air pressure of the negative pressure air path to be stable.
Further, in one example, the controller is further electrically connected to the master control valve 130, the branch opening/closing valves 210 on the plurality of branch gas paths, the needle valve 220, and the mass flow meter 230. When the air pressure value detected by the air pressure detector 140 reaches a set value, the controller controls the master control valve 130 and the branch opening and closing valve 210 on the branch air path to be sampled to open, and adjusts the needle valve 220 on the branch air path until the mass flow meter 230 detects that the air flow rate reaches the set value. Still further, after the preset time, the controller controls the vacuum pump 110, the master control valve 130 and the branch switching valve 210 to be closed, and the sampling is completed. In addition, a preset gas sampling volume can be set, and when the mass flow meter 230 displays that the preset gas sampling volume is reached, the controller controls the vacuum pump 110, the master control valve 130 and the branch opening and closing valve 210 to be closed, so that sampling is completed.
Further, the present invention provides a gas sampling method using the gas sampling apparatus 10 of any of the above examples, the gas sampling method comprising the steps of:
second ends of the plurality of branch gas paths are respectively connected with a gas sample collecting pipe, and the gas sample collecting pipe is arranged in a space or a container needing to collect gas;
closing the master control valve 130, and starting the vacuum pump 110 to stabilize the air pressure of the negative pressure air path within a set air pressure range;
opening a master control valve 130 and a branch opening and closing valve 210 on a branch gas path needing sampling;
the needle valve 220 is adjusted to bring the flow rate value displayed by the mass flow meter 230 to the set flow rate value.
The present invention will be further described below by taking as an example the method of using the gas-using apparatus shown in FIG. 1.
The method of using the gas-using apparatus shown in fig. 1 comprises the steps of:
the second ends of the 4 branch air paths are respectively connected with a gas sample collecting pipe, and the gas sample collecting pipe is arranged in a space or a container needing to collect gas.
The master control valve 130 and the branch switching valve 210 on the branch gas path are closed, and the vacuum pump 110 is started, so that the display indication number of the gas pressure detector 140 on the vacuum buffer tank 120 is stabilized within the set gas pressure range.
And opening the master control valve 130 and the branch opening and closing valve 210 on the branch gas path to be sampled.
The needle valve 220 is adjusted to bring the flow rate value displayed by the mass flow meter 230 to the set flow rate value.
After a set time, the bypass on-off valve 210 is closed, and the cumulative volume of gas collected is read from the mass flow meter 230.
And taking down the gas sample collection pipe to finish the sampling process.
The gas sampling device 10 and the gas sampling method comprise the negative pressure gas circuit and the plurality of branch gas circuits, negative pressure suction is uniformly provided through the negative pressure gas circuit, each branch gas circuit can be independently controlled, the sampling mode is flexible, sampling of a plurality of samples can be carried out simultaneously, the sampling efficiency is greatly improved, or parallel sampling of the same sample is carried out simultaneously, so that the consistency of the parallel samples is improved, and environmental errors are reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A gas sampling device is characterized by comprising a negative pressure gas path and a plurality of branch gas paths; the negative pressure gas circuit comprises a vacuum pump, a vacuum buffer tank and a master control valve which are connected in series through gas guide tubes from a first end to a second end, the negative pressure gas circuit further comprises a gas pressure detector, the gas pressure detector is used for detecting the gas pressure of the negative pressure gas circuit, each branch gas circuit comprises a branch opening and closing valve and a gas flow rate monitoring mechanism which are connected in series through the gas guide tubes from the first end to the second end, the first end of each branch gas circuit is communicated with the second end of the negative pressure gas circuit, and the second end of each branch gas circuit is used for being connected with a gas sample collecting tube.
2. The gas sampling device of claim 1, wherein the gas flow rate monitoring mechanism comprises a needle valve and a mass flow meter in series.
3. The gas sampling device according to claim 1, wherein at least one of the branched gas paths is further provided with a first solid impurity filter disposed at a side of the gas flow rate monitoring mechanism near the second end of the branched gas path.
4. The gas sampling device of claim 1, wherein there are 2-6 of said branched gas paths.
5. The gas sampling device of claim 1, wherein the gas pressure detector is disposed on the vacuum buffer tank.
6. The gas sampling assembly of claim 1, wherein the vacuum buffer tank has a volume of 10L to 1000L.
7. The gas sampling device of claim 1, wherein the vacuum buffer tank is connected with a vent valve and a second solid impurity filter, and the vent valve and the second solid impurity filter are connected in series through a gas guide tube.
8. The gas sampling device according to any one of claims 1 to 7, further comprising a controller, wherein the controller is electrically connected to the gas pressure detector and the vacuum pump, the controller controls the vacuum pump to operate when the gas pressure detected by the gas pressure detector is below a set value, and the controller controls the vacuum pump to stop operating when the gas pressure detected by the gas pressure detector reaches the set value.
9. The gas sampling device according to claim 8, wherein the controller is further electrically connected to the main control valve, the branch opening/closing valves on the plurality of branch gas paths, and the gas flow rate monitoring mechanism, and when the gas pressure detected by the gas pressure detector reaches a set value, the controller controls the main control valve and the branch opening/closing valves on the branch gas paths to be sampled to open, and adjusts the gas flow rate monitoring mechanisms on the corresponding branch gas paths until the gas flow rate reaches the set value.
10. A gas sampling method using the gas sampling apparatus according to any one of claims 1 to 9, the gas sampling method comprising the steps of:
second ends of the plurality of branch gas paths are respectively connected with a gas sample collecting pipe, and the gas sample collecting pipe is arranged in a space or a container needing to collect gas;
closing the master control valve, and starting the vacuum pump to stabilize the air pressure of the negative pressure air path within a set air pressure range;
opening the master control valve and the branch opening and closing valves on the branch gas paths to be sampled;
adjusting the gas flow rate monitoring mechanism until the gas flow rate reaches a set flow rate value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911171119.4A CN110702475A (en) | 2019-11-26 | 2019-11-26 | Gas sampling device and gas sampling method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911171119.4A CN110702475A (en) | 2019-11-26 | 2019-11-26 | Gas sampling device and gas sampling method |
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| CN110702475A true CN110702475A (en) | 2020-01-17 |
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| CN201911171119.4A Pending CN110702475A (en) | 2019-11-26 | 2019-11-26 | Gas sampling device and gas sampling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062056A (en) * | 2021-10-09 | 2022-02-18 | 中核核电运行管理有限公司 | Sampling device suitable for negative pressure and malleation gas pipeline |
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| CN102410942A (en) * | 2011-07-25 | 2012-04-11 | 迈瑞尔实验设备（上海）有限公司 | Online sampling system |
| CN202351232U (en) * | 2011-08-15 | 2012-07-25 | 四川科伦药业股份有限公司 | Vacuum negative pressure device used for sterility test |
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| CN103234779A (en) * | 2013-05-15 | 2013-08-07 | 中农宸熙（福建）物联科技有限公司 | Multi-point-position water quality sampling and detecting process and specific device thereof |
| CN105203713A (en) * | 2015-09-29 | 2015-12-30 | 张雪梅 | Intelligent automatic air sampling device used for occupational health |
| CN205665060U (en) * | 2016-06-01 | 2016-10-26 | 宁波汽车零部件检测有限公司 | Four -channel VOC gas production device |
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2019
- 2019-11-26 CN CN201911171119.4A patent/CN110702475A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410942A (en) * | 2011-07-25 | 2012-04-11 | 迈瑞尔实验设备（上海）有限公司 | Online sampling system |
| CN202351232U (en) * | 2011-08-15 | 2012-07-25 | 四川科伦药业股份有限公司 | Vacuum negative pressure device used for sterility test |
| CN202972519U (en) * | 2012-12-03 | 2013-06-05 | 西安康鸿环保科技有限公司 | Simple closed-loop vacuum negative pressure device |
| CN103234779A (en) * | 2013-05-15 | 2013-08-07 | 中农宸熙（福建）物联科技有限公司 | Multi-point-position water quality sampling and detecting process and specific device thereof |
| CN105203713A (en) * | 2015-09-29 | 2015-12-30 | 张雪梅 | Intelligent automatic air sampling device used for occupational health |
| CN205665060U (en) * | 2016-06-01 | 2016-10-26 | 宁波汽车零部件检测有限公司 | Four -channel VOC gas production device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062056A (en) * | 2021-10-09 | 2022-02-18 | 中核核电运行管理有限公司 | Sampling device suitable for negative pressure and malleation gas pipeline |
| CN114062056B (en) * | 2021-10-09 | 2024-03-19 | 中核核电运行管理有限公司 | Sampling device suitable for negative pressure and positive pressure gas pipeline |
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Application publication date: 20200117 |