CN108593951A - Multichannel sampling device - Google Patents
Multichannel sampling device Download PDFInfo
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- CN108593951A CN108593951A CN201711309616.7A CN201711309616A CN108593951A CN 108593951 A CN108593951 A CN 108593951A CN 201711309616 A CN201711309616 A CN 201711309616A CN 108593951 A CN108593951 A CN 108593951A
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- Prior art keywords
- access
- filtering
- sample introduction
- connect
- control valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1065—Multiple transfer devices
Abstract
The present invention relates to detection technique fields, provide a kind of multichannel sampling device, and the wherein device includes：Current-carrying mouth and outlet, outlet are connect with detection device, further include：Several sample introduction accesses, one end are connect with current-carrying mouth, and the other end is connect with outlet, for introducing sample carrier；Access is filtered, one end is connect with the outlet of sample introduction access, and the other end is connect with the import of sample introduction access, circulation loop is formed by first flow control valve and sample introduction access, for filtering the contaminated-fluid in sample introduction access；Counter flow paths, one end are connect with sample introduction access, and the other end is connect with first flow control valve.By the way that counter flow paths are arranged between sample introduction access and filtering access, when can ensure that sample introduction access realizes sample introduction, remaining sample introduction access is used cooperatively by counter flow paths and filtering access, prevent the contaminated-fluid in the injector in cleaning state from importing outlet, the pollution restorability for improving sampling device, can realize the recycling of multichannel sample introduction access.
Description
Technical field
The present invention relates to detection technique fields, and in particular to a kind of multichannel sampling device.
Background technology
In the prior art, for the detection of trace chemical, be by detected sample by one or more air-flows into
Enter equipment to be measured in real time, and can be exported by one or more and air-flow is discharged.The device of common detection gas phase has gas
Phase chromatography, Ion mobility spectrometry (Ion Mobility Spectrometry, referred to as IMS) also become ionic mobility
Spectrum, mass spectrum, microsensor, spectrum etc..It is a kind of new gas phase separation occurred in the 1970s by taking IMS as an example
And detection technique, it is qualitative come the separation for carrying out ion with the difference of ion drift time, by similar with chromatographic retention
Originally concept is referred to as plasma chromatography.Ion mobility spectrometry is generally divided into 3 major parts：With outside atmosphere interface into
Sample part；Carry out ionization separation and the migration tube and acquisition of ion detection, analysis and the detection device for showing spectrogram.
These vapor detection equipment all in the presence of one how to acquire sample and how asking sample input equipment
Topic --- especially in the presence of sample is with non-gaseous.Thermal desorption injection is generally used in analytical chemistry field.
Thermal desorption injection is by the sampler of an outside, usually a kind of high temperature paper or with Teflon coating
All-glass paper (referred to as sampling paper) is collected sample by modes such as wipings, and sampling paper is then inserted into thermal desorption injection
In the heating cavity of device.Then thermal desorption cavity heats sampling paper, the sample collected by way of radiating and conducting
It is converted into gas phase state, and is transmitted into detection device by certain mode.
But since most of vapor detection equipment all there is extremely stringent sampling system to limit, common scene behaviour
Work can cause great load pressure to equipment.The pollution of general sampling system can directly result in the failure of vapor detection equipment,
And sampling system needs professional that can just be reused by the maintenance of long period in the prior art.
Invention content
The technical problem to be solved in the present invention is to overcome the pollution restorability difference of sampling device in the prior art
Defect.
In consideration of it, the present invention provides a kind of multichannel sampling device, including current-carrying mouth and outlet, the outlet and detection
Device connects, and the multichannel sampling device further includes：
Several sample introduction accesses, one end are connect with the current-carrying mouth, and the other end is connect with the outlet, to be checked for sucking
Sample；
Access is filtered, one end is connect with the outlet of the sample introduction access, and the other end is connect with the import of the sample introduction access,
Circulation loop is formed by first flow control valve and the sample introduction access, for filtering the contaminated stream in the sample introduction access
Body；
Counter flow paths, one end are connect with the sample introduction access, and the other end is connect with the first flow control valve, for preventing
The contaminated-fluid being only in the injector of cleaning state imports outlet.
Optionally, the filtering access includes at least one filtering branch and at least one pump branch, is respectively used to institute
It states contaminated-fluid and carries out once filtering and secondary filter；The filtering branch passes through second flow control valve string with the pump branch
Connection；The import of the filtering branch is the import of the filtering access, and the outlet of the pump branch is going out for the filtering access
Mouthful.
Optionally, the filtering access includes the filtering branch and a pump branch of several parallel connections, described
The quantity for filtering branch is equal with the quantity of sample introduction access.
Optionally, the sample introduction access includes concatenated injector and first direction control valve, one end of the injector
It is connect with the outlet；One end of the first direction control valve and one end of the current-carrying mouth and the filtering access connect
It connects.
Optionally, the filtering branch includes concatenated first filtration members and second direction control valve；The pump branch packet
Include at least one second filtration members and fluid pump being serially connected.
Optionally, the pump branch includes two the second filtration members, is separately positioned on the upstream and downstream of the fluid pump.
Optionally, one end of the counter flow paths is connect with the first flow control valve, the other end and the current-carrying mouth
Connection.
Optionally, one end of the counter flow paths is connect with the first flow control valve, and the other end is logical with the sample introduction
The outlet on road connects.
Optionally, the first flow control valve is bypass flow control valve, and the second flow control valve is that confluence flows
Control valve.
Optionally, the first direction control valve is triple valve, and the second direction control valve is two-port valve.
Technical solution of the present invention has the following advantages that：
1. multichannel sampling device provided in an embodiment of the present invention, by the way that adverse current is arranged between sample introduction access and filtering access
Access, when can ensure that sample introduction access realizes sample introduction, remaining sample introduction access is used cooperatively by counter flow paths with access is filtered,
It prevents the contaminated-fluid in the injector in cleaning state from importing outlet, improves the pollution restorability of sampling device,
It can realize the recycling of multichannel sample introduction access.
2. multichannel sampling device provided in an embodiment of the present invention, wherein filtering access includes filtering branch and pump branch；Into
After contaminated-fluid in sample access carries out first time filtering by filtering branch, passes through the second control valve and carry out flow control, stream
Enter to pump branch and carries out secondary filter；I.e. contaminated-fluid realizes secondary filter in filtering access, can improve filter effect, larger
Improve the pollution recovery capability of the sampling device in ground；In addition, realizing the stream of the contaminated-fluid of filtering access by the second control valve
Amount control so that contaminated-fluid can farthest realize filtering, and then can ensure preferable filter effect.
3. multichannel sampling device provided in an embodiment of the present invention adjusts the stream of counter flow paths by first flow control valve
Amount so that the outflow of sample introduction access is more than filtering access into flow, i.e., extra fluid can countercurrently enter in sample introduction access
Into filtering access, the residual contamination fluid in injector to be cleaned can be avoided to enter detection device, lead to testing result not
Accurately.
4. multichannel sampling device provided in an embodiment of the present invention, wherein by the way that several mistakes in parallel are arranged in filtering access
Branch is filtered, the rate of filtration of contaminated-fluid can be improved；In addition, the quantity of filtering branch is equal with the quantity of sample introduction access, i.e.,
One sample introduction access corresponds to a filtering branch, can prevent contaminated-fluid influencing each other between sample introduction access.
5. multichannel sampling device provided in an embodiment of the present invention, by the way that filtering is respectively set in the upstream and downstream of fluid pump
Part so that contaminated-fluid, by once filtering, can prevent pollution of the contaminated-fluid to fluid pump before by fluid pump.
6. multichannel sampling device provided in an embodiment of the present invention, the control by using first direction control valve to sample introduction access
System, and the control using second direction control valve to filtering access, can ensure the sample introduction in the multichannel multichannel sampling device
Access can recycle, and improve the service efficiency of sampling device.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is a structural schematic diagram specifically illustrated of multichannel sampling device in the embodiment of the present invention 1；
Reference numeral：100- the first sample introduction accesses；The first injectors of 111-；The second injectors of 112-；113- third sample introductions
Device；The first triple valves of 121-；The second triple valves of 122-；123- third triple valves；200- filters access；210- filters branch；
The first filter cores of 211-；The second filter cores of 212-；213- third filter cores；The first two-port valves of 214-；The second two-port valves of 215-；216- thirds
Two-port valve；220- pumps branch；The 4th filter cores of 221-；The 5th filter cores of 222-；223- fluid pumps；230- second flow control valves；
300- first flow control valves；400- counter flow paths.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second ", " third " are used for description purposes only,
It is not understood to indicate or imply relative importance.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other at conflict.
Embodiment 1
The embodiment of the present invention provides a kind of multichannel sampling device, as shown in Figure 1, the multichannel sampling device include current-carrying mouth and
Outlet, outlet are connect with detection device, are examined for detected sample to be placed in detection device after sample introduction access
It surveys.The multichannel sampling device further includes：Sample introduction access filters access 200 and counter flow paths 400；Wherein, sample introduction access and mistake
It filters access 200 and circulation loop is formed by first flow control valve 300.
As shown in Figure 1, including 3 sample introduction accesses in parallel, it is followed successively by the first sample introduction access from left to right, the second sample introduction is logical
Road and third sample introduction access.The connection type of three sample introduction accesses is identical, by taking the first sample introduction access 100 as an example, the first sample introduction
Access 100 includes concatenated first injector 111 and first direction control valve 121, and the first injector 111 is arranged in a first direction
The downstream of control valve 121.Wherein, the outlet of the first injector 111 is connect with filtering access 200 and outlet respectively；First
Directional control valve is the first triple valve 121, which includes one outlet, two entrances, middle outlet and first
Injector 111 connects, and entrance is connect with the outlet of current-carrying mouth and first flow control valve 300 respectively.
Wherein, by switching the different conducting states of the first triple valve 121, the operating mode of the first injector 111 is adjusted.
When the first triple valve 121 is switched to location A, the first injector 111 is in normal sample introduction state；When the first triple valve 121 is cut
When changing to B location, the first injector 111 is in cleaning state, can use remaining feeder at this time, such as may be used
113 sample introduction of second injector 112 and third injector.
As shown in Figure 1, filtering access 200 includes pump branch 220, second flow control valve 230 and 3 filtering branch in parallel
Road, from top to bottom filtering branch one end respectively with third injector 113, the second injector 112 and the first injector 111
Outlet connection, for realizing the primary filtering of above-mentioned injector.
Wherein, the composition of 3 filtering branches is identical, is carried out by taking the filtering branch 210 being connect with the first injector 111 as an example
Description.It includes 211 and first two-port valve 214 of concatenated first filter core to filter branch 210, by switching the first two-port valve 214
Position, adjustment filtering branch 210 working condition.When the first two-port valve 214 switches to location A, filtering branch 210 is disconnected
It opens；When the first two-port valve 214 switches to B location, filtering branch 210 is connected.
In addition, the first filter core 211 in filtering branch 210 is arranged in the upstream of the first two-port valve 214.That is the first filter core
211 connect with the outlet of the first injector 111, and the outlet of the first two-port valve 214 is connect with second flow control valve 230 so that
Before by the first two-port valve 214, the filtering through filtration core can be prevented to the first two-port valve contaminated-fluid in sample introduction access
214 pollute, and so as to avoid aggregation of the pollution in the first two-port valve 214 when using for a long time, reduce filter effect.
As shown in Figure 1, second flow control valve 230 is three to enter a confluence flow control valve out, i.e. 3 filtering branches
Outlet is connect with the entrance of the second flow control valve 230, after the confluence of second flow control valve 230, into pump branch
220.Wherein, the flow of second flow control valve 230 can be configured according to actual use situation, such as could be provided as 1：
1：1.By the flow proportional that second flow control valve 230 is arranged so that contaminated-fluid can farthest realize filtering, into
And it can ensure preferable filter effect.
Pump branch 220 includes the 4th filter core 221 being sequentially connected in series, fluid pump 223 and the 5th filter core 222.4th filter core
221 connect with the outlet of second flow control valve 230, and the outlet of the 5th filter core 222 connects with the entrance of first flow control valve 300
It connects.Wherein, flowing of the fluid pump 223 for realizing contaminated-fluid in filtering access 200.By by the 4th filter core 221 and
5th filter core 222 is separately positioned on the both sides of fluid pump 223 so that contaminated-fluid is passing through fluid pump 223 and first flow
Before control valve 300, respectively by primary filtering, contaminated-fluid can be prevented to fluid pump 223 and first flow control valve
300 pollution.
As shown in Figure 1, first flow control valve 300 enters the four bypass flow control valves gone out for one.Its entrance is used for and the
Five filter cores 222 connect, and four outlets are connect with counter flow paths 400 and three sample introduction accesses respectively；I.e. by filtered sample
It is respectively fed to counter flow paths 400 and three sample introduction accesses.The flow of the first flow control valve 300 can be according to actual conditions
Corresponding setting is carried out, the flow of counter flow paths 400 is adjusted by first flow control valve 300 so that fluid in sample introduction access
Outflow be more than outlet into flow, i.e., fluid extra in sample introduction access can be entered countercurrently in filtering access 200, energy
It enough avoids the residual fluid in injector to be cleaned from entering detection device, causes testing result inaccurate.For example, first flow control
The flow proportional of valve 300 processed could be provided as 1:3:3:3.
The outlet of counter flow paths 400 is connect with current-carrying mouth, i.e., in the sample carrier and counter flow paths 400 that enter from current-carrying mouth
Filtered fluid mixing after, into sample introduction access.
In addition, further include having instruction device (not shown) in the multichannel sampling device, for prompt operating personnel this
When be the work of which injector.
As a kind of optional embodiment of the present embodiment, which includes following several working methods：
1, injector switching mode：The multichannel sampling device is by three two-port valves and three triple valve controls, Ke Yishi
Recycling between existing multichannel injector, the injector not used can be cleaned.
For example, when being in cleaning state from 111 sample introduction of the first injector, the second injector 112 and third injector 113
When, it is switched to the first two-way in location A, and filtering branch 210 corresponding to the first triple valve 121 of the first injector 111
Valve 214 is switched to location A；It is switched to B location, the second two-port valve 215 corresponding to the second triple valve 122 of the second injector 112
It is switched to B location；It is switched to B location corresponding to the third triple valve 123 of third injector 113, third two-port valve 216 is switched to
B location.
After the switching of each valve, the fluid entered from current-carrying mouth and the fluid flowed out from counter flow paths 400
After mixing, it imported into the first injector 111, is mixed with the sample in injector, finally enter detection device and analyzed.
Second injector 112 and third injector 113 are in cleaning state, and contaminated-fluid is realized by fluid pump 223
It is recycled in filtering access 200, it can be by the contaminant filter in contaminated-fluid by being filtered for multiple times for multiple filter cores.
When the first injector 111 is heavily polluted, can be switched to by the direction of switching two-port valve and triple valve
Other clean injectors；It is identical when the state of specific two-port valve and triple valve is with the first 111 sample introduction of injector.
2, the mode of contamination is prevented：Such as it is largely polluted when existing in the second injector 112 or third injector 113
It, may during the contaminated-fluid that is such as flowed out from the second injector 112 flows back to the second two-port valve 215 when fluid
It is diffused into outlet in the junction of 3 sample introduction accesses, the test of detected sample is made to be affected, it is therefore necessary to effectively kept away
Exempt from contamination.
As shown in Figure 1, being mixed using by the sample carrier in the fluid and current-carrying mouth in counter flow paths 400, first is adjusted
The flow of flow control valve 300, make the outflow of the first injector 111 be more than outlet into flow, extra fluid countercurrent current
It enters in the second filter core 212 and third filter core 213, to effectively avoid the dirt of the second injector 112 or third injector 113
Dye fluid enters in outlet.
As the alternative embodiments of filter core in this implementation, the first filtration members or the second filtration members can be sponge, glass
Fibre, corrugated paper, high-efficient nonwoven cloth, activated carbon, molecular sieve etc. need to only guarantee to the effectively filtering of the contaminated-fluid in fluid i.e.
It can.
Can be throttle valve, speed governing valve, overflow as the alternative embodiments of first flow control valve in the present embodiment
Throttle valve, vapour lock or needle-valve etc..
Can be throttle valve, speed governing valve, overflow as the alternative embodiments of second flow control valve in the present embodiment
Throttle valve, vapour lock or needle-valve etc..
As the alternative embodiments of first direction control valve in the present embodiment, first direction control valve may be used two
A individual valve is replaced.
As the alternative embodiments of second direction control valve in the present embodiment, second direction control valve may be used one
A individual valve is replaced.
As a kind of optional embodiment of the present embodiment, the quantity of sample introduction access can according to the demand of real system into
Row setting, for example, it may be 4 groups, 5 groups etc..
Embodiment 2
The embodiment of the present invention provides a kind of multichannel sampling device, is with the difference of embodiment 1：It is wrapped in filtering access 200
A filtering branch 210 and a pump branch 220 are included, filtering branch 210 includes at least one filter core.I.e. several sample introduction accesses
Outlet simultaneously connect with a filtering branch 210, by filtering branch 210 filter after, be sent into pump branch progress secondary filter.
Wherein, branch is filtered in the outlet of each sample introduction access by a two position three-way valve with filtering access 200 respectively
210 import connection, the filtering of sample introduction and contaminated-fluid can be realized by switching the two position three-way valve in each sample introduction access.
As a kind of optional embodiment of the present embodiment, the quantity of filtering branch 210 can be carried out according to actual conditions
Setting, for example, it may be 2,4 etc..
As another optional embodiment of the present embodiment, filtering access 200 can only include at least one filter core,
Need to only ensure that when the fluid flowed out from sample introduction access passes through the filtering access 200 impurity therein can be filtered.
Embodiment 3
The embodiment of the present invention provides a kind of multichannel sampling device, is with the difference of embodiment 1 or embodiment 2：Adverse current is logical
The one end on road 400 is connect with filtering access 200, and the other end is arranged between the outlet of injector and the outlet of sampling device,
I.e. counter flow paths 400 are arranged around the mode of injector.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of multichannel sampling device, including current-carrying mouth and outlet, the outlet are connect with detection device, feature exists
In the multichannel sampling device further includes：
Several sample introduction accesses, one end are connect with the current-carrying mouth, and the other end is connect with the outlet, are carried for introducing sample
Body；
Access (200) is filtered, one end is connect with the outlet of the sample introduction access, and the import of the other end and the sample introduction access connects
It connects, circulation loop is formed by first flow control valve (300) and the sample introduction access, for filtering in the sample introduction access
Contaminated-fluid；
Counter flow paths (400), one end are connect with the sample introduction access, and the other end is connect with the first flow control valve (300),
For preventing the contaminated-fluid in the injector in cleaning state from importing outlet.
2. multichannel sampling device according to claim 1, which is characterized in that the filtering access (200) includes at least one
A filtering branch (210) and at least one pump branch (220) are respectively used to carry out primary filtering and secondary to the contaminated-fluid
Filtering；The filtering branch (210) is connected with the pump branch (220) by second flow control valve (230)；The filtering branch
The import on road (210) is the import of the filtering access (200), and the outlet of the pump branch (220) is the filtering access
(200) outlet.
3. multichannel sampling device according to claim 2, which is characterized in that the filtering access (200) is if include dry doubling
Connection the filtering branch (210) and a pump branch (220), it is described filtering branch (210) quantity and it is described into
The quantity of sample access is equal.
4. multichannel sampling device according to any one of claim 1 to 3, which is characterized in that the sample introduction access includes
Concatenated injector and first direction control valve, one end of the injector is connect with the outlet；The first direction control
One end of valve processed is connect with one end of the current-carrying mouth and the filtering access (200).
5. multichannel sampling device according to any one of claim 2 to 4, which is characterized in that the filtering branch (210)
Including concatenated first filtration members and second direction control valve；The pump branch (220) includes at least one the be serially connected
Two filtration members and fluid pump (223).
6. multichannel sampling device according to claim 5, which is characterized in that the pump branch (220) includes two second
Filtration members are separately positioned on the upstream and downstream of the fluid pump (223).
7. multichannel sampling device according to any one of claim 1 to 6, which is characterized in that the counter flow paths (400)
One end connect with the first flow control valve (300), the other end is connect with the current-carrying mouth.
8. multichannel sampling device according to any one of claim 1 to 6, which is characterized in that the counter flow paths (400)
One end connect with the first flow control valve (300), the other end is connect with the outlet of the sample introduction access.
9. the multichannel sampling device according to any one of claim 2 to 8, which is characterized in that the first flow control
Valve (300) is bypass flow control valve, and the second flow control valve (230) is confluence flow control valve.
10. the multichannel sampling device according to any one of claim 5 to 9, which is characterized in that the first direction control
Valve is triple valve, and the second direction control valve is two-port valve.
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| 王清海: "气相色谱柱切换技术与应用", 色谱, no. 05 * |
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