CN117969193A - Jacket needle type convection displacement positive pressure sampling device - Google Patents
Jacket needle type convection displacement positive pressure sampling device Download PDFInfo
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- CN117969193A CN117969193A CN202410389776.0A CN202410389776A CN117969193A CN 117969193 A CN117969193 A CN 117969193A CN 202410389776 A CN202410389776 A CN 202410389776A CN 117969193 A CN117969193 A CN 117969193A
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- 238000005070 sampling Methods 0.000 title claims abstract description 399
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 28
- 238000004891 communication Methods 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 108
- 238000000034 method Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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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
- G01N1/24—Suction devices
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a jacket needle type convection displacement positive pressure sampling device, which is characterized in that when gas displacement and gas sampling are carried out on a sampling tank, a sampling needle is utilized to probe to the bottom of the sampling tank, and convection is formed in the sampling tank skillfully, so that the original gas in the sampling tank is effectively removed through the bottom-up convection action in the gas displacement stage, and further, the existence of the sampling needle is used as a flow limiting buffer in the gas sampling stage, so that the gas pressure is orderly increased and is prevented from being instantaneously swelled, and the sampling tank is prevented from bearing excessive pressure in a short time. The sampling needle also plays a function of series connection, and two or more sampling tanks are effectively connected in series through the series connection of the sampling needle, so that the parallel propulsion and sample backup of the two or more sampling tanks in the two aspects of gas replacement and gas sampling can be realized.
Description
Technical Field
The invention relates to a jacket needle type convection displacement positive pressure sampling device.
Background
The pressure tank sampling is widely applied to the fields of underground coal mines, metallurgy, tunnel engineering, oil refineries, environmental protection, sanitation epidemic prevention and the like so as to rapidly determine the concentration of Volatile Organic Compounds (VOCs), toxic and harmful gases, odorous gases and the like (such as carbon monoxide, carbon dioxide and hydrogen sulfide) in the field environment.
However, existing positive pressure tank sampling systems suffer from a number of drawbacks. Firstly, the system setting of the sampling tank is difficult to realize real-time replacement, pressurization and vacuumizing can be performed at intervals in turn only in the gas sampling process, the pushing (pressing) force of the sampling pump is limited, partial residual gas always exists in the sampling tank after repeated cleaning and replacement, the detection precision of the sampling gas is seriously affected by the residual gas, and the sampling tank is seriously polluted by long-time residual.
In the prior art, although the sampling tank can be subjected to pressurized pumping for multiple times, the pumping process often adopts a sandwich superposition cleaning mode, and the residual gas cannot be completely removed, so that inaccuracy and interference of gas sample components of the subsequent pressurized sampling are caused, the sampling efficiency is low, the single sampling time is long, and the single sampling period often reaches half an hour or even 1 hour.
And in the positive pressure sampling process, the structure of the positive pressure sampling flow path of the existing sampling pump is complex, the pipelines and interfaces of the gas path components are more, the gas leakage is easy to pollute, and the cleaning and replacement require frequent manual switching of the switch valve, so that the operation is complex.
Disclosure of Invention
The invention provides a jacket needle type convection displacement positive pressure sampling device, which effectively solves the defects existing in the prior art.
The invention provides a jacket needle type convection displacement positive pressure sampling device, which can realize displacement sampling flow paths and pressurized sampling flow paths, wherein a connecting port is in fluid communication with a sampling tank through a first pipeline and then through a sampling needle, the sampling tank is in fluid communication with an outlet through a second pipeline, a sampling pump is arranged on the first pipeline or the second pipeline, a front switching valve is arranged on a passage of the first pipeline, a rear switching valve is arranged on a passage of the second pipeline, the sampling needle comprises an embedded needle, an outer liner tube and an interface piece, one end of the embedded needle is communicated with the first pipeline outside the sampling tank, the other end of the embedded needle extends to the tank bottom of the sampling tank, the interface piece surrounds the embedded needle and is communicated with the top opening of the sampling tank, the outer liner tube extends from the interface piece and is communicated with the second pipeline, the device starts the displacement sampling flow paths, wherein the front switching valve and the rear switching valve are opened, the sampling port is fixedly connected with the connecting port, the sampling pump pumps self-sampling gas into the sampling port, the sampling gas flows through the first pipeline and then flows through the embedded needle and is in the first pipeline and is in the inner liner tube, the sampling tank and is blown out of the sampling tank from the bottom of the sampling tank through the first pipeline, and the interface piece is connected with the inner liner tube, and the sampling gas is blown out of the sampling tank from the bottom of the sampling tank through the interface, and the sampling tank; the device is then switched to a pressurized sampling flow path, wherein the back on/off valve is closed, whereby the sample gas from the sampling port is fed into the connection port, the sample gas is blown into the sampling tank through the first line and through the in-line needle, whereby an accumulation of the sample gas is performed in the sampling tank, the sample gas in the sampling tank is gradually increased in pressure from the tank bottom, and when the pressure increases to a certain threshold value, the front on/off valve is closed.
Preferably, the sampling needle is inertly coated with molten silicon.
Preferably, a pressure gauge is additionally arranged on the passage of the first pipeline, the reading in the pressure gauge is gradually increased in the operation process of the pressurized sampling flow path, and once the reading in the pressure gauge is larger than a specific threshold value, the front switch valve is closed to enable the front switch valve and the rear switch valve to be closed, so that gas transmission to the sampling tank is stopped.
Preferably, the embedded needle penetrates into the tank bottom of the sampling tank at a position 2-5 cm away from the tank bottom.
The invention also provides a jacket needle type convection displacement positive pressure sampling device which can realize displacement sampling flow paths and pressurized sampling flow paths, wherein in the device, a connecting port is in fluid communication with a second sampling tank through a first pipeline and then through a second sampling needle, the second sampling needle is communicated with a first sampling needle through a first sampling needle, the first sampling needle is communicated with a first sampling tank, the first sampling tank is communicated with a second pipeline through a first sampling needle, the second pipeline is in fluid communication with an outlet, a sampling pump is arranged on the first pipeline or the second pipeline, the second sampling needle comprises a second embedded needle, a second outer liner tube and a second interface piece, one end of the second embedded needle is communicated with the first pipeline outside the second sampling tank, the other end of the second embedded needle extends to the bottom of the second sampling tank, the second interface piece surrounds the second embedded needle and is communicated with a top opening of the second sampling tank, the second outer liner tube extends from the second interface piece and is communicated with the first sampling needle, the first embedded needle comprises the first embedded needle, the first embedded needle extends from the first interface piece to the first liner tube, the first interface piece is communicated with the first liner tube, the first liner tube extends from the first liner tube to the first liner tube and the first liner tube is communicated with the second liner tube, the first liner tube is arranged on the first liner tube and the second liner tube is communicated with the second liner tube, the first liner tube is arranged on the second liner tube and the second liner tube, the second liner tube is communicated with the second liner tube is arranged on the second liner tank and the second liner tank is connected with the second liner tank, the first back switch valve, the second front switch valve and the second back switch valve are all opened, the sampling port is fixedly connected with the connecting port, the sampling pump pumps self-sampling gas into the sampling port, the sampling gas flows through the first pipeline and flows through the second embedded needle and then is sent to the tank bottom of the second sampling tank, the sampling gas forms convection flow in the second sampling tank from bottom to top, so that the original gas in the second sampling tank is pushed to flow out of the second outer liner tube from bottom to top through the second interface piece, then the original gas from the second sampling tank is pushed to the first embedded needle under the pushing of the sampling gas and enters the first sampling tank through the first embedded needle, the bottom-to-top convection flow is formed at the tank bottom of the first sampling tank, the original gas in the second sampling tank and the first sampling tank is pushed to flow through the first interface piece and the first outer liner tube, the original gas in the second sampling tank is further discharged from the outlet along the second pipeline, the device is then switched to a pressurized sampling flow path, wherein the first rear switching valve is closed, the sampling pump pumps sampling gas into the sampling port, the sampling gas is conveyed to the tank bottom of the second sampling tank after flowing through the first pipeline and flowing through the second embedded needle, the sampling gas forms convection flow in the second sampling tank from bottom to top, thereby pushing the raw gas in the second sampling tank to flow out of the second outer liner pipe from bottom to top through the second interface piece, thereby collecting the sampling gas in the second sampling tank, then the sampling gas in the second sampling tank gradually overflows from the tank bottom to the second embedded needle, flows into the first outer liner pipe and the first interface piece along the second embedded needle, flows into the first sampling tank, thereby collecting the sampling gas in the first sampling tank, and then, as the sampling gas in the first sampling tank and the second sampling tank is collected, the pressure of the sampling gas in the first and second sampling tanks is gradually increased from the tank bottom, and when the pressure is increased to a specific threshold value, the first front switch valve, the second rear switch valve and the second front switch valve are simultaneously closed.
Preferably, the first and second sampling needles are inertly coated with molten silicon.
Preferably, a pressure gauge is additionally arranged on the first pipeline, the pressure gauge is gradually increased along with the gradual pressure increase in the first sampling tank and the second sampling tank, once the reading in the pressure gauge is larger than a specific threshold value, the first front switch valve is closed firstly to finish gas sampling of the first sampling tank, the first sampling tank is taken out, the second rear switch valve and the second front switch valve are closed again to finish gas sampling of the second sampling tank, and the second sampling tank is taken out.
Preferably, the first insert pin penetrates into the first sampling tank at a distance of 2-5 cm from the tank bottom.
Preferably, the second embedded needle penetrates into a position 2-5 cm from the bottom of the second sampling tank.
In summary, in the jacket needle type convection displacement positive pressure sampling device provided by the invention, when gas displacement and gas sampling are carried out on the sampling tank, the sampling needle is used for probing to the bottom of the sampling tank, the sampling needle is not only used as an essential ring for ensuring a smooth air flow channel, but also skillfully forms convection in the sampling tank, so that the original gas in the sampling tank is effectively removed through the bottom-up convection action in the gas displacement stage, the sampling tank is effectively cleaned, the sampling tank is prevented from being polluted, and further, in the gas sampling stage, the existence of the sampling needle can be used as a current limiting buffer to ensure that the air pressure is orderly increased so as not to cause the instantaneous pressure surge, thereby avoiding the excessive pressure bearing in the sampling tank in a short time. Furthermore, the sampling needle also plays a function of series connection, and two or more sampling tanks are effectively connected in series through the series connection of the sampling needle, so that the parallel propulsion and sample backup of the two or more sampling tanks in the two aspects of gas replacement and gas sampling can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following discussion will discuss the embodiments or the drawings required in the description of the prior art, and it is obvious that the technical solutions described in connection with the drawings are only some embodiments of the present invention, and that other embodiments and drawings thereof can be obtained according to the embodiments shown in the drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a basic structural schematic of a jacket needle type convection displacement positive pressure sampling apparatus according to the present invention.
Fig. 2 shows a specific configuration of a sampling needle in a jacket needle type convection displacement positive pressure sampling device according to the present invention.
Fig. 3 is a schematic diagram showing the basic structure of two sampling tanks provided in a jacket needle type convection displacement positive pressure sampling apparatus according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by a person of ordinary skill in the art without the need for inventive faculty, are within the scope of the invention, based on the embodiments described in the present invention.
In short, the jacket needle type convection displacement positive pressure sampling device provided by the invention can form pressure difference at the top and the bottom of the closed tank by utilizing the jacket needle double-cavity gas circuit structure and the pushing (pressure) force of the sampling pump, so that the air flow in the closed sample tank can quickly and thoroughly convect and replace residual gas in the tank body, the accuracy of the sampled sample, especially trace gas components in background air, is ensured, and simultaneously, the vacuumizing cleaning preservation and the pressurized sampling preservation of the tank body can be realized by switching the switch valve and the pump, and the versatility and the practicability of the device are enhanced.
In general, the device realizes a replacement sampling flow path and a pressurized sampling flow path in parallel with the same basic structure, and the two flow paths are in a field at different moments of the device, are opposite to each other and are complementary to each other. Hereinafter, the substitution sampling flow path will be first introduced and the general structure of the device will be clearly described in the process.
The primary purpose of the replacement sampling flow path is to "as much as possible" empty the original gas in the sampling tank and the piping connected to the sampling tank, thereby ensuring that the final sampled gas is the sampled gas that the detecting party wishes to sample to reflect the field conditions to the greatest extent. For an introduction of the substitution sampling flow path, reference is made to fig. 1.
Fig. 1 shows a basic structural schematic of a jacket needle type convection displacement positive pressure sampling apparatus according to the present invention.
As shown in fig. 1, the direction of gas flow of the replacement sampling flow path in which the sampling port is fluidly connected to the sampling tank 103 via the first line 101 through the connection port 100 fixed thereto and the sampling needle 102 is fluidly connected to the outlet 105 via the second line 104 is indicated by thin arrows in the embodiment of fig. 1, wherein the sampling pump 106 is provided in the first line 101 to control the flow direction of the gas flow.
It should be noted that the sampling pump 106 may be provided in either the first line 101 or the second line 104.
In operation of the displacement sampling flow path, sampling pump 106 is turned on to pump out the sample gas in the sample port, and then flows through first line 101, through sampling needle 102 and into sampling tank 103. The sampling tank 103 is subjected to gas substitution after the sampling gas flows into the sampling tank 103, thereby purging the inside of the sampling tank 103 of the original gas as much as possible. Further, in the sampling tank 103, the raw gas is blown by the sampling gas through the sampling needle 102 and then into the second line 104 until being blown out of the outlet 105.
The operation of the displacement sampling flow path ensures that the sampling tank and the first and second lines are thoroughly purged, minimizing the residual amount of raw gas.
As can be seen from the above description, the sampling needle 102 is used twice in the replacement sampling flow path operation, i.e., through the sampling needle when the sampling gas flows into the sampling tank, and then through the sampling needle again when the raw gas is blown out of the sampling tank.
For this purpose, it is necessary to introduce the configuration of the sampling needle 102 in particular. Fig. 2 shows a specific configuration of a sampling needle in a jacket needle type convection displacement positive pressure sampling device according to the present invention.
It is first noted that the sampling needle 102 is preferably inertly coated with molten silicon to enhance the performance involved.
As shown in fig. 2, the sampling needle 102 includes an embedded needle 102a, an outer liner 102b, and an interface piece 102c. One end of the embedded needle 102 is communicated with the first pipeline 101 outside the sampling tank 103, and the other end extends to the tank bottom of the sampling tank 103. The mouthpiece 102c surrounds the embedded needle 102a and communicates with the top opening of the sample tank 103. An outer liner 102b extends from the interface member 102c and communicates to the second pipeline 104.
It can also be seen in fig. 1 and 2 that the on-off valve 108 is divided into a front on-off valve 108a and a rear on-off valve 108b, the front on-off valve 108a being provided in the path of the first line 101 and the rear on-off valve 108b being provided in the path of the second line 104. During the replacement sampling flow path operation, both the front on-off valve 108a and the rear on-off valve 108b are opened. And the operation of the on-off valve 108 in the pressurized sampling flow path operation will be described in detail later.
With this structure as described above, when the replacement sampling flow path is operated, both the front and rear switching valves 108a and 108b are opened so as not to affect the smoothness of the flow path, the sample gas pushed out by the pump continues to flow under the guidance of the in-line needle 102a after flowing through the first line 101, and since the in-line needle 102a is extended to the bottom of the sampling tank 103, the sample gas flows into the bottom of the sampling tank 103 under the guidance of the in-line needle 102a, whereby the sample gas forms convection flow inside the sampling tank 103 from bottom to top, and the raw gas in the sampling tank 103 is pushed to flow out from the outer liner 102b through the mouthpiece 102c from bottom to top by the gas convection effect, and then, since the outer liner 102b communicates with the second line 104, the gas flowing out from the outer liner 102b will blow out of the outlet 105 through the second line 104.
This arrangement of the sampling needle is important to the present invention, as described above, and the insert needle 102 extends to the bottom of the can, and in actual operation, for example, the insert needle is inserted into the bottom of the sampling can at a position 2-5 cm away from the bottom of the can, and all the gas in the can be rapidly circulated and removed by the action of the pumping (pressure) force, thereby completely displacing the gas.
After the completion of the operation of the replacement sampling flow path, the pressurized sampling flow path can be quickly switched. The pressurized sampling flow path is indicated by a bold arrow in fig. 1. In the pressurized sampling flow path, the back opening/closing valve 108b is first closed, and thus sampling gas is collected in the sampling tank 103.
As the gas pressure in the sample tank 103 increases, the sample gas in the sample tank 103 increases in pressure from the tank bottom.
At this time, the pressure gauge 107 is additionally installed on the passage of the first pipeline 101, and although the back switch valve 108b on the second pipeline 104 is closed at this time, the front switch valve 108a on the first pipeline 101 is still opened, so that the first pipeline 101 is still in communication with the sampling tank 103, and the air pressure displayed on the pressure gauge 107 can still characterize the air pressure in the sampling tank 103.
As the sampled gas in the sample tank 103 is stepped up from the bottom of the tank, the reading of the pressure gauge 107 also gradually increases, and once the reading in the pressure gauge is greater than a certain threshold, the front on-off valve 108a is closed, thereby terminating gas delivery to the sample tank 103. At this point, since both the front and back on-off valves are closed, the sample tank 103 will no longer be in communication with the first line 101 and the second line 104, and a worker may remove the sample tank 103 from the container for subsequent analysis of the sampled gas.
Fig. 3 is a schematic diagram showing the basic structure of two sampling tanks provided in a jacket needle type convection displacement positive pressure sampling apparatus according to the present invention.
As shown in fig. 3, the sampling port is fixed to the connection port 100, and when the sampling flow path is replaced, the sampling pump 106 is turned on to push out the sampling gas pump in the sampling port, and then the sampling gas pump flows through the first line 101, flows through the second insert needle 202a of the second sampling needle 202, and flows into the second sampling tank 203. The second sampling tank 203 is subjected to gas substitution after the sampling gas flows into the sampling tank 203, thereby purging the inside of the second sampling tank 203 of the original gas as much as possible. Further, in the second sampling tank 203, the raw gas is blown by the sampling gas through the second interface 202c and the second outer liner 202b of the second sampling needle 202. So far, the configuration is similar to the embodiment shown in fig. 1.
The next flow path configuration then begins to differ from the embodiment shown in fig. 1. In fig. 3, the second outer liner 202b will not be in direct communication with the second line 104, with its gas flow being in communication with the first sample tank 103. Specifically, the first sampling tank 103 is provided with a first sampling needle 102 in a mating relationship, and the first sampling needle 102 includes a first insert needle 102a, a first outer liner 102b, and a first interface member 102c. One end of the first embedded needle 102a is communicated with the first outer lining pipe 102b outside the first sampling tank 103, and the other end extends to the tank bottom of the first sampling tank 103. The first interface member 102c surrounds the first interior 102a and communicates with the top opening of the first sample tank 103. A first outer liner 102b extends from the first interface member 102c and communicates with the second pipeline 104.
In fig. 3, a second front open/close valve 208a is provided in the first line 101, a second rear open/close valve 208b and a first front open/close valve 108a are provided in a passage between the second sampling tank 203 and the first sampling tank 103, the second rear open/close valve 208b is located closer to the second sampling tank 203 than the first front open/close valve 108a, and a first rear open/close valve 108b is provided in the second line 104.
In this embodiment, the configuration surrounding the first sampling tank is substantially the same as the second sampling tank, but the outlet of the first sampling tank (the first outer liner) is connected to the inlet of the second sampling tank (the second inner liner), thereby connecting the first sampling tank and the second sampling tank in series, while the outlet of the second sampling tank (the second outer liner) is connected as the outlet of the second sampling tank to the second line 104.
Thus, in the embodiment of fig. 3, when the replacement sampling flow path is operated, the four switch valves are all opened, after the sampling gas pressed by the pump flows through the first pipeline 101, the sampling gas continues to flow under the guidance of the second embedded needle 202a, and as the second embedded needle 202a extends to the bottom of the second sampling tank 203, the sampling gas flows into the bottom of the second sampling tank 203 under the guidance of the first embedded needle 202a, thereby forming a convection flow in the second sampling tank 203 from bottom to top, and under the action of gas convection, the raw gas in the second sampling tank 203 is pushed to flow out from the second outer liner 202b through the second interface member 202c from bottom to top, then, as the second outer liner 202b is communicated with the first embedded needle 102a, the raw gas is pushed to the first embedded needle 102a under the pushing of the sampling gas, and enters the first sampling tank 103 through the first embedded needle 102a, and forms a convection flow from bottom to top under the bottom in the bottom of the first sampling tank 103, thereby removing the raw gas in the first sampling tank 103, and then the raw gas is pushed to leave the first pipeline 102b from bottom through the first interface member 102b, and the original gas is further discharged from the first pipeline 102b through the first interface member and the first interface member 102.
After the completion of the operation of the replacement sampling flow path, the flow may be switched to the pressurized sampling flow path. The pressurized sampling flow path is indicated by a bold arrow in fig. 3. In the pressurized sampling flow path, only the first rear switching valve 108b is closed, and at the same time, the sampling pump 106 blows the sampling gas from the sampling port into the second outer liner 202b of the second sampling needle 202 via the first line 101, and flows into the second sampling tank 203 from the tank top of the second sampling tank 203 via the second interface 202c, whereby the sampling gas is collected in the second sampling tank 203.
As the air pressure in the second sampling tank 203 increases, the sampling gas in the second sampling tank 203 gradually overflows from the tank bottom to the second embedded needle 202a, and flows into the first outer liner 102b and the first interface 102c along the second embedded needle 202a, and then flows into the first sampling tank 103, whereby the sampling gas is also collected in the first sampling tank 103.
And as the gas pressure in the first sample tank 103 increases, the sample gas in the first sample tank 103 increases in steps from the tank bottom.
At this time, in the present embodiment, a pressure gauge 107 is attached to the first line 101. As the pressure in the two sample tanks increases gradually, the reading on the pressure gauge 107 increases gradually, and once the reading in the pressure gauge 107 is greater than a certain threshold, the first front on-off valve 108a, the second rear on-off valve 208b, and the second front on-off valve 208a are simultaneously closed, completing the gas sampling of the first sample tank 103 and the second sample tank 203.
Thus, the embodiments shown in fig. 1 and 3 will be described substantially. In the embodiment shown in fig. 1, when the sampling tank is subjected to gas replacement and gas sampling, the sampling needle is used for probing to the bottom of the sampling tank, the sampling needle is not only used as an essential ring for ensuring the smooth flow passage, but also skillfully forms convection in the sampling tank, so that the original gas in the sampling tank is effectively removed through the bottom-up convection effect in the gas replacement stage, the sampling tank is effectively cleaned, the sampling tank is prevented from being polluted, and further, in the gas sampling stage, the existence of the sampling needle can be used as a buffer to ensure that the gas pressure is orderly increased without causing the instantaneous surge of the pressure, thereby avoiding the excessive pressure born in the sampling tank in a short time.
In the embodiment shown in fig. 3, the sampling needle performs the function of serial connection in addition to the function shown in fig. 1, and by the serial connection of the sampling needles, two sampling tanks are effectively connected in series, so that the two sampling tanks can be advanced in parallel in both gas replacement and gas sampling. It follows that in the embodiment shown in fig. 3, the sampling needle assumes more functions.
The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, and variations which fall within the spirit and scope of the invention are intended to be included in the scope of the invention.
Claims (9)
1. A jacket needle type convection displacement positive pressure sampling device is characterized in that the device can realize a displacement sampling flow path and a pressurized sampling flow path,
In the device, the connection port is in fluid communication with the sampling tank through the first pipeline and then through the sampling needle, the sampling tank is in communication with the outlet through the sampling needle after passing through the second pipeline, the sampling pump is arranged on the first pipeline or the second pipeline, wherein the front switch valve is arranged on the passage of the first pipeline, the rear switch valve is arranged on the passage of the second pipeline,
The sampling needle comprises an embedded needle, an outer liner tube and an interface piece, wherein one end of the embedded needle is communicated with the first pipeline outside the sampling tank, the other end of the embedded needle extends to the bottom of the sampling tank, the interface piece surrounds the embedded needle and is communicated with the top opening of the sampling tank, the outer liner tube extends from the interface piece and is communicated with the second pipeline,
The device starts a replacement sampling flow path, wherein a front switching valve and a rear switching valve are both opened, a sampling port is fixedly connected with a connecting port, a sampling pump pumps self-sampling gas into the sampling port, the sampling gas flows through a first pipeline and flows through an embedded needle and then is sent to the bottom of a sampling tank, the sampling gas forms convection flow in the sampling tank from bottom to top, and therefore the original gas in the sampling tank is pushed to flow out of an outer liner pipe from bottom to top through a connector, and the original gas is blown out of an outlet along with the sampling gas through a second pipeline;
The device is then switched to a pressurized sampling flow path, wherein the back on/off valve is closed, whereby the sample gas from the sampling port is fed into the connection port, the sample gas is blown into the sampling tank through the first line and through the in-line needle, whereby an accumulation of the sample gas is performed in the sampling tank, the sample gas in the sampling tank is gradually increased in pressure from the tank bottom, and when the pressure increases to a certain threshold value, the front on/off valve is closed.
2. The apparatus of claim 1, wherein the sampling needle is inertly coated with molten silicon.
3. The apparatus of claim 1, wherein a pressure gauge is added to the passageway of the first pipeline, and wherein during operation of the pressurized sampling flow path, readings in the pressure gauge are gradually increased, and wherein closing the front on-off valve causes both the front on-off valve and the rear on-off valve to close once the readings in the pressure gauge are greater than a specified threshold, thereby terminating gas delivery to the sampling tank.
4. The device of claim 1, wherein the embedded needle penetrates into the sample tank at a distance of 2-5 cm from the bottom of the tank.
5. A jacket needle type convection displacement positive pressure sampling device is characterized in that the device can realize a displacement sampling flow path and a pressurized sampling flow path,
In the device, the connecting port is in fluid communication with the second sampling tank through the first pipeline and then through the second sampling needle, the second sampling needle is in communication with the first sampling needle through the first sampling needle, the first sampling needle is in communication with the first sampling tank, the first sampling tank is in communication with the second pipeline through the first sampling needle, the second pipeline is in fluid communication with the outlet, the sampling pump is arranged on the first pipeline or the second pipeline,
The second sampling needle comprises a second embedded needle, a second outer liner tube and a second interface piece, one end of the second embedded needle is communicated with the first pipeline outside the second sampling tank, the other end of the second embedded needle extends to the tank bottom of the second sampling tank, the second interface piece surrounds the second embedded needle and is communicated with the top opening of the second sampling tank, the second outer liner tube extends from the second interface piece and is communicated with the first embedded needle of the first sampling needle,
The first sampling needle comprises a first embedded needle, a first outer liner tube and a first interface piece, one end of the first embedded needle is communicated with the second outer liner tube outside the first sampling tank, the other end of the first embedded needle extends to the tank bottom of the first sampling tank, the first interface piece surrounds the first embedded needle and is communicated with the top opening of the first sampling tank, the first outer liner tube extends from the first interface piece and is communicated with the second pipeline,
A second front switch valve is arranged on the first pipeline, a second rear switch valve and a first front switch valve are arranged on a passage between the second sampling tank and the first sampling tank, the second rear switch valve is closer to the second sampling tank than the first front switch valve, a first rear switch valve is arranged on the second pipeline,
The device starts a replacement sampling flow path, wherein a first front switch valve, a first rear switch valve, a second front switch valve and a second rear switch valve are all opened, a sampling port is fixedly connected with a connecting port, a sampling pump pumps self-sampling gas into the sampling port, the sampling gas flows through a first pipeline and flows through a second embedded needle and then is sent to the bottom of a second sampling tank, the sampling gas forms convection flow in the second sampling tank from bottom to top, thereby pushing the original gas in the second sampling tank to flow out from a second outer liner pipe through a second interface piece from bottom to top,
Then, the original gas from the second sampling tank is pushed to the first embedded needle under the pushing of the sampling gas, and enters the first sampling tank through the first embedded needle, and bottom-up convection is formed at the tank bottom of the first sampling tank, so that the original gas in the second sampling tank and the original gas in the first sampling tank are both pushed to pass through the first interface piece and the first outer lining pipe to leave the first sampling tank, and then are discharged from the outlet along the second pipeline,
The device is then switched to a pressurized sampling flow path, wherein the first back on-off valve is closed, the sampling pump pumps a sampling gas into the sampling port, the sampling gas flows through the first pipeline and then flows through the second embedded needle and is then sent to the tank bottom of the second sampling tank, the sampling gas forms convection flow in the second sampling tank from bottom to top, thereby pushing the raw gas in the second sampling tank to flow out of the second outer liner pipe from bottom to top through the second interface piece, thereby collecting the sampling gas in the second sampling tank,
Then, the sampling gas in the second sampling tank gradually overflows from the tank bottom to the second embedded needle, and flows into the first outer liner tube and the first interface piece along the second embedded needle and then flows into the first sampling tank, so that the sampling gas is collected in the first sampling tank,
Then, as the collection of the sampling gas in the first sampling tank and the second sampling tank is accumulated, the sampling gas in the first and second sampling tanks is gradually increased in pressure from the tank bottom, and when the pressure is increased to a certain threshold value, the first front opening and closing valve, the second rear opening and closing valve and the second front opening and closing valve are simultaneously closed.
6. The apparatus of claim 5, wherein the first and second sampling needles are inertly coated with molten silicon.
7. The apparatus of claim 5, wherein a pressure gauge is added to the first line, and wherein as the pressure in the first and second sample tanks increases, the pressure gauge readings increase, and wherein once the pressure gauge readings are greater than a specified threshold, the first front switch valve is first closed to complete the gas sampling in the first sample tank, the first sample tank is removed, and then the second rear switch valve and the second front switch valve are closed to complete the gas sampling in the second sample tank, and the second sample tank is removed.
8. The device of claim 5, wherein the first insert needle extends into the first sample tank at a distance of 2-5 cm from the bottom of the first sample tank.
9. The device of claim 5, wherein the second embedded needle penetrates into the second sampling tank at a distance of 2-5 cm from the bottom of the second sampling tank.
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| CN202410389776.0A CN117969193A (en) | 2024-04-02 | 2024-04-02 | Jacket needle type convection displacement positive pressure sampling device |
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