CN109238588A - Detection method for gas tightness of gas flow channel, gas passive sampling method and passive sampling device - Google Patents
Detection method for gas tightness of gas flow channel, gas passive sampling method and passive sampling device Download PDFInfo
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- CN109238588A CN109238588A CN201811136277.1A CN201811136277A CN109238588A CN 109238588 A CN109238588 A CN 109238588A CN 201811136277 A CN201811136277 A CN 201811136277A CN 109238588 A CN109238588 A CN 109238588A
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- 238000005070 sampling Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims description 29
- 230000008859 change Effects 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 claims description 47
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 239000012855 volatile organic compound Substances 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 238000002444 silanisation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
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- 239000003502 gasoline Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 238000012806 monitoring device Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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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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Abstract
The invention discloses a method for detecting the air tightness of a gas flow channel, which comprises the following steps: s1, preparing a gas flow component, and correspondingly communicating one end of the flow control component with an air inlet of a closed container; s2, connecting the flow control components with a control unit, and installing a pressure gauge; s3, plugging the air inlet end of the flow regulating assembly, opening the air inlet of the closed container, and setting the flow rate of the flow regulating assembly to be maximum; and S4, automatically controlling the opening/closing of each flow control assembly through the control unit, displaying the pressure change in the closed container correspondingly communicated with the pressure gauge through the pressure gauge when a certain flow control assembly is opened, and judging the air tightness of the corresponding gas flow channel according to the pressure change. The invention can independently complete continuous and passive sampling of the atmospheric volatile organic compound by time intervals under the condition of no power supply.
Description
Technical field
The present invention relates to sample detection fields, and in particular to a kind of detection method of gas flow channel air-tightness, gas
Passiveness sampling method and passive sampling apparatus.
Background technique
Volatile organic compounds (Volatile Organic Compounds, VOCs), refers to high vapour pressure simultaneously
The organic compound of steam easy to form at ambient temperature and pressure.VOCs is many kinds of, from a wealth of sources, including organic solvent, combustion
Material such as gasoline and diesel oil, petroleum distillate, aerosol spray tank propellant, refrigerant, responsibility product, additives of pigments and other
Many industry and the consumer goods also include the natural source VOCs of plant Spontaneous release.
The sample mode of atmospheric volatile organic compound usually has actively sampling and passive sampling two major classes.Actively sample
It needs to pressurize using electromagnetic pump and is filled with sample gas into sampling apparatus, there are the hidden danger such as absorption and pollution.Negative pressure sampling uses
Flow controller, can be in -30-7Hg " between maintain a certain constant-quality flow velocity, and to atmospheric volatile organic compound without
Absorption.
Existing atmospheric volatile organic compound be all generally single channel acquisition, a set of sampling apparatus can only with individually adopt
Sample container is connected the air sample acquired in the single period, such as 1 hour, 3 hours, 24 hours, cannot reflect atmospheric environment
Middle volatile organic matter is at any time, the conditions such as weather, temperature change and the Species differences and the concentration variation that occur, and it is mainly answered
For in the super station station of atmosphere environment supervision, it is impossible to be used in field sampling, portability are poor；Also, its sampling channel with it is other
Pollution factor monitoring device shares sampling general pipeline one longer, has and the potential risks such as adsorbs and interfere with each other, thus causes to set
Standby utilization rate is low, and sampling is at high cost, is unfavorable for the spot sampling of long-time multi-point volatile organic compounds.
Summary of the invention
The present invention provides a kind of detection of gas sampling channel components air-tightness for above-mentioned defect in the prior art
Method, gas sampling method and device, can unregulated power supply under conditions of at times, complete independently atmospheric volatile it is organic
Compound accomplished continuously or intermittently, passive type sampling.
It is as follows that the present invention solves scheme provided by above-mentioned technical problem:
On the one hand, a kind of detection method of gas flow channel air-tightness is provided comprising following steps:
S1, preparation include the gas that several flowing control assemblies, an air guide component, a pressure gauge and a flow adjust component
Body flow module, one end of each flowing control assembly adjust component with air guide component, flow and form an independent gas stream
Dynamic channel, the air inlet of the other end one closed container of corresponding connection；
S2, each flowing control assembly is all connected with to control unit, and the pressure gauge is installed；
S3, the inlet end that the flow adjusts component is blocked, opens the air inlet of closed container, and the flow is adjusted
The flow velocity of component is set as maximum；
And it S4, each flowing control assembly is automatically controlled by described control unit opens/closes, and a certain flowing is controlled
When component processed is opened, show that it corresponds to the pressure change in the closed container of connection by the pressure gauge, and become according to pressure
Change the air-tightness for judging corresponding gas flow channel.
Preferably, in the step S4, the mistake that each flowing control assembly opens/closes is controlled by described control unit
Journey includes:
S41, each flowing control assembly is set by control unit at least opening once, the time opened every time is
10-15s；
And S42, the other end of each flowing control assembly connection air guide component, flow successively adjusted into component, and logical
It crosses described control unit and successively controls each flowing control assembly and at least open once, and the time opened every time continues 10-
15s。
On the one hand, a kind of detection method of gas flow channel air-tightness is also provided comprising following steps:
S1, preparation include the gas flow module that a flowing control assembly, a pressure gauge and a flow adjust component, and
The flowing control assembly has a common end and several mutually isolated outlet end, and the common end is connected to an outlet end
An independent fluid channel is formed, each fluid channel adjusts component with flow and is connected to form a gas flow channel；
S2, the flowing control assembly is connected to control unit, and the pressure gauge is installed；
S3, the inlet end that the flow adjusts component is blocked, opens the air inlet of closed container, and the flow is adjusted
The flow velocity of component is set as maximum；
And S4, automatically controlled by described control unit the opening of each fluid channel in the flowing control assembly/
It closes, opening/closing for gas flow channel corresponding with each fluid channel is controlled with this, and a certain gas flow channel is beaten
When opening, show that it corresponds to the pressure change in the closed container of connection by the pressure gauge, and according to pressure change judgement pair
Answer the air-tightness of gas flow channel.
Preferably, in the step S4, every one stream in the flowing control assembly is automatically controlled by described control unit
The process that body channel opens/closes includes:
S41, each fluid channel is set by control unit at least opening once, the time opened every time is 10-
15s；
And S42, the common end connection flow adjusting component by the flowing control assembly, and pass through described control unit
It successively controls each fluid channel at least to open once, and the time opened every time continues 10-15s.
Preferably, in the step S4, the pressure gauge connects display unit, when the pressure change that the pressure gauge is shown
When value > 0.01psi, which is sent to the display unit and shown by the pressure gauge.
Preferably, in the step S4, the pressure gauge connects reminding unit, when the pressure gauge is by the pressure change
While value is sent to the display unit and is shown, the reminding unit generates alerting signal.
On the other hand, a kind of passiveness sampling method of gas is also provided comprising following steps:
S1, several closed containers of preparation；
S2, the detection that gas flow channel air-tightness is completed according to detection method as claimed in claim 1 or 3；
S3, the time point that the flowing control assembly opening is set by described control unit and the time persistently opened；
And S4, by the inlet end of flowing control assembly by air guide component, flow adjust component connection have pre- level pressure
The gaseous environment of power, and open the air inlet that flow adjusts component and closed container；Described control unit control flowing control
Component opens/closes, and thus acquires corresponding gaseous sample to corresponding closed appearance by corresponding gas flow channel
It is stored in device.
On the other hand, a kind of passive sampling apparatus of gas is also provided comprising:
Several closed containers；
Gas flow module comprising several flowing control assemblies, an air guide component and a flow adjust component, each
One end of flowing control assembly adjusts component and is connected to form an independent gas flow channel with air guide component, flow, another
The air inlet of end one closed container of corresponding connection；
Control unit connects each flowing control assembly, opened for automatically controlling the flowing control assembly/
It closes, corresponding gas flow channel is opened/closed with this；
And filter, one end connect the flow and adjust component, other end connection has the Ring of predetermined pressure
Border；
Or, including:
Several closed containers；
Gas flow module a comprising flowing control assembly and a flow adjust component, and the flowing control group
Part has a common end and several mutually isolated outlet end, and the common end is connected to form an independent stream with an outlet end
Body channel；Each outlet end of the flowing control assembly one closed container of corresponding connection, common end are connected to flow adjusting group
Part is connected to form a gas flow channel so that each fluid channel adjusts component with flow；
Control unit connects the flowing control assembly, opens/closes for automatically controlling the fluid channel, with
This controls opening/closing for gas flow channel corresponding with each fluid channel；
And filter, one end connect the flow and adjust component, other end connection has the Ring of predetermined pressure
Border.
Preferably, the passive type sampling apparatus of the gas further include: pressure gauge is used for when a certain gas flow channel
When opening, the pressure change in the closed container of connection corresponding with the gas flow channel is shown.
Preferably, it includes: flow control valve and/or the current limliting with different pore size distribution channel that the flow, which adjusts component,
Part.
Effect brought by technical solution of the present invention:
The present invention can unregulated power supply under conditions of at times, complete independently atmospheric volatile organic compound it is continuous
Or the sampling of interval, passive type, while can avoid the presence of absorption when sampling.
Detailed description of the invention
Fig. 1 is that the overall structure connection of component involved in the detection method of gas flow channel air-tightness in embodiment one is shown
It is intended to；
Fig. 2 is the connection schematic diagram of control unit and several flowing control assemblies in embodiment one；
Fig. 3 is the structural schematic diagram of constriction in embodiment one；
Fig. 4 a is the overall structure connection of component involved in the detection method of gas flow channel air-tightness in embodiment two
Schematic diagram；
Fig. 4 b is the structural schematic diagram of flowing control assembly in embodiment two；
Fig. 5 is the connection schematic diagram of control unit and flowing control assembly in embodiment two；
Fig. 6 is the structural schematic diagram of the passive type continuous sampling device of gas in embodiment five；
Fig. 7 is the structural schematic diagram of the passive type continuous sampling device of gas in embodiment six.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment one:
As shown in Figs. 1-2, the present embodiment is related to a kind of detection method of gas flow channel air-tightness comprising following step
It is rapid:
S1, preparation include several flowing control assembly V1...Vn, an air guide component 1, a pressure gauge 2 and a flow tune
The gas flow module of component 3 is saved, one end of each flowing control assembly adjusts component 3 with air guide component 1, flow and forms one
(such as flowing control assembly V1 and air guide component 1, flow adjust component 3 and form gas flow channel independent gas flow channel
S1；Flowing control assembly V2 and air guide component 1, flow adjust component 3 and form gas flow channel S2...), and each flowing is controlled
The corresponding connection one of the other end of component (such as flowing control assembly V1, flowing control assembly V2... flowing control assembly Vn) processed
The air inlet of closed container (such as container P1, container P2... container Pn)；
S2, each flowing control assembly is all connected with to control unit 4, and is adjusted in the air guide component 1 with flow
Three-way connection 5 is set between component 3, the pressure gauge 2 is installed, so that air guide component 1, flow adjust component 3 and pressure gauge 2
It is connected respectively an interface of three-way connection 5；
S3, the inlet end that the flow adjusts component 3 is blocked, opens the air inlet of closed container, and by the flow tune
The flow velocity of section component 3 is set as maximum；
And it S4, each flowing control assembly is automatically controlled by described control unit 4 opens/closes, and a certain flowing
When control assembly (such as flowing control assembly V1) is opened every time, show that it corresponds to the closed container of connection by the pressure gauge 2
Pressure change in (such as container P1), and judged corresponding to gas flow channel (such as gas flow channel S1) according to pressure change
Air-tightness；
Specifically, controlling the process that each flowing control assembly opens/closes by described control unit 4 and including:
S41, each flowing control assembly is set by control unit 4 at least open primary (such as 2 times or more), every time
The time of opening is 10-15s (preferably 12s)；Specifically, being opened if each flowing control assembly is only opened once
Time be 10-15s (preferably 12s), it is then continuously off；If each described flowing control assembly opening 2 times or more, removing
Continuously off outer after last time opening 10-15s (preferably 12s), remaining is closed after opening 10-15s (preferably 12s) every time
Close 2-5s (preferably 3s)；
And S42, one end of each flowing control assembly connection air guide component 1, flow successively adjusted into component 3, and logical
Cross described control unit 4 and successively control each flowing control assembly and at least open primary (such as 2 times or more), and open every time when
Between continue 10-15s (preferably 12s)；Specifically, the time opened is 10- if each flowing control assembly is only opened once
15s (preferably 12s), it is then continuously off；If each flowing control assembly opening 2 times or more, except last time opens 10-
Continuously off outer after 15s (preferably 12s), remaining is turned off 2-5s (preferably after opening 10-15s (preferably 12s) every time
3s), each flowing control assembly is controlled according to this at least to open once/at least close once；
For example, first adjusting component 3 by one end connection air guide component 1, the flow of previous flowing control assembly V1, and passing through institute
It states control unit 4 to control previous flowing control assembly V1 opening 2 times, first switches on 10-15s, be then shut off 2-5s, then open
It is continuously off after 10-15s, previous flowing control assembly V1 is controlled according to this at least to be opened once/at least close once；
By the other component of previous flowing control assembly V1 and gas flow module, (including air guide component 1, flow are adjusted again
Component 3 etc.) it is separated, then one end connection air guide component 1, the flow of next flowing control assembly V2 are adjusted into component 3, and logical
Cross described control unit 4 and control next flowing control assembly V2 and only open once, opening time continue it is continuously off after 10-15s,
Next flowing control assembly V2 is controlled according to this at least to open once/at least close once；
Successively repeatedly, until described control unit 4 controls the last one flowing control assembly and at least opens once/at least close
It closes once, the detection for the gas flow channel air-tightness for being correspondingly connected with each closed container is completed with this；
In the present embodiment, it is preferred that described control unit 3 includes 12 road single-chip microcontroller of technical grade, and each flowing control group
Part can repeatedly be opened under the control of control unit 4/repeatedly be closed, can be as a result, for each gas flow channel
A change value of pressure is obtained when opening/closing flowing control assembly each time, repeatedly opening/repeatedly closing then can get multiple pressures
Power changing value further can reduce error in judgement by the comprehensive analysis to multiple change value of pressure, so that air-leakage test
As a result more accurate.
In addition, each pressure gauge 2 is all connected with display unit 6 (such as display screen) and/or connects in the step S42
Reminding unit 7 (such as acoustic-optic alarm) is connect, as the change value of pressure > 0.01psi of the pressure gauge 2 display, is at this time
Illustrate gas flow channel poor air-tightness (it is possible that gas leakage), the change value of pressure is sent to described by the pressure gauge 2 as a result,
Display unit 6 shown, and/or, it is carried out when the change value of pressure is sent to the display unit 6 by the pressure gauge 2
While display, the reminding unit 7 generates alerting signal, reminds the flowing control group of personnel's particular exam gas flow module
Part 1, air guide component 2, flow adjust whether component 3 etc. has gas leakage.
Further, can also simultaneously by portable power supply device 8 (such as rechargeable lithium battery) connect described control unit 4 with
And flowing control assembly, use efficient SPWM inversion switch technology, for 220V exchange output, 24V or 12V DC output and
5V-USB twoport output, as a result, even if the unregulated powers such as field supply under conditions of can also carry out above-mentioned air-tightness inspection and
Continuous sampling.
In the present embodiment, the flowing control assembly is solenoid valve；The air guide component 1 includes by full polytetrafluoroethylene (PTFE) material
Pipeline made of matter or stainless steel material through silanization treatment；The closed container is sample can made of stainless steel, and its
Inner wall is coated with silanization coating, volume 1-6L, and its internal pressure≤0.01psi；In addition, the closed container and flowing
The number of control assembly is identical, and specific number can need to be arranged according to actual samples, such as may be configured as 8；The tool
The gaseous environment for having predetermined pressure includes atmospheric environment；The flow adjusts component 3 as flow control valve and/or has different holes
The constriction 9 (as shown in Figure 3) of the distribution channel 91 of diameter.
Embodiment two:
The present embodiment is also provided that a kind of detection method of gas flow channel air-tightness, as shown in fig. 4 a, with reality
Apply example one the difference is that:
S1, preparation include the gas flowing group that a flowing control assembly 1 ', a pressure gauge 2 and a flow adjust component 3
Part (not including gas operated device 1 in embodiment one), and as shown in Figure 4 b, the flowing control assembly 1 ' has a common end 101
And several mutually isolated outlet end 102,103,104,105...N, the common end 101 is connected to form one with an outlet end
Independent fluid channel S1 ', S2 ' ... Sn ', each fluid channel with flow adjust component 3 be connected to formed a gas flow
(such as fluid channel S1 ' and flow adjust component 3 and form gas flow channel S1 in channel；Fluid channel S2 ' and flow adjust component
3 form gas flow channel S2...)；Each outlet end of the flowing control assembly 1 ' one closed container of corresponding connection is (such as
Container P1, container P2... container Pn) so that each gas flow channel one closed container of corresponding connection；The present embodiment
In, the flowing control assembly 1 ' is preferably that (such as 12 channel multiposition valves have 12 independent fluids to multichannel multiposition valve
Channel)；
S2, the flowing control assembly 1 ' is connected to control unit 4, and is adjusted in the flowing control assembly 1 ' with flow
Three-way connection 5 is set between component 3, the pressure gauge 2 is installed, so that flowing control assembly 1 ', flow adjust component 3 and pressure
Power table 2 is connected respectively an interface of three-way connection 5；
S3, the inlet end that the flow adjusts component 3 is blocked, opens the air inlet of closed container, and by the flow tune
The flow velocity of section component 3 is set as maximum；
And S4, beating for each fluid channel in the flowing control assembly 1 ' is automatically controlled by described control unit 4
Opening/closing, controlling gas flow channel corresponding with each fluid channel (such as fluid channel S1 ') with this, (such as gas flowing is logical
Road S1) open/close, and a certain gas flow channel (such as gas flow channel S1) every time open when, pass through the pressure
Table 2 shows that it corresponds to the pressure change in the closed container (such as container P1) of connection, and judges corresponding gas according to pressure change
The air-tightness of flow channel (such as gas flow channel S1)；
Specifically, controlling the process that each flowing control assembly opens/closes by described control unit 4 and including:
S41, each fluid channel is set by control unit 4 at least open primary (such as 2 times or more), open every time
Time be 10-15s (preferably 12s)；Specifically, if only open it is primary, the time opened be 10-15s (preferably
12s), then continuously off；If open 2 times or more, except continuously off after last time opening 10-15s (preferably 12s)
Outside, remaining is turned off 2-5s (preferably 3s) after opening 10-15s (preferably 12s) every time；
And S42, the connection of the common end 101 flow adjusting component 3 by the flowing control assembly 1 ', and pass through the control
Unit 4 processed successively controls each fluid channel and at least opens primary (such as 2 times or more), and the time opened every time continues 10-15s
(preferably 12s)；Specifically, the time opened is 10-15s (preferably 12s) if each fluid channel is only opened once,
Then continuously off；If each fluid channel opening 2 times or more, being held after opening 10-15s (preferably 12s) except last time
Continuous closing is outer, remaining is turned off 2-5s (preferably 3s) after opening 10-15s (preferably 12s) every time, controls each fluid according to this
It is primary that primary/at least closing is at least opened in channel；
For example, the common end connection flow of previous fluid channel S1 ' is first adjusted component 3, and pass through described control unit 4
It controls previous fluid channel S1 ' to open 2 times, first switches on 10-15s, be then shut off 2-5s, then persistently closed after opening 10-15s
It closes, controls previous fluid channel S1 ' according to this and at least open once/at least close once；
Next fluid channel S2 ' is controlled by described control unit 4 again equally to open 2 times, first switches on 10-15s, so
After close 2-5s, then open it is continuously off after 10-15s, control according to this next fluid channel S2 ' at least open it is primary/at least close
It closes primary；
Successively repeatedly, until described control unit 4 controls the last one fluid channel and at least opens primary/at least closing one
It is secondary, the detection for the gas flow channel air-tightness for being correspondingly connected with each closed container is completed with this；
In the present embodiment, each fluid channel can repeatedly be opened under the control of control unit 4/repeatedly be closed, as a result,
For each gas flow channel, a change value of pressure can be obtained when opening/closing fluid channel each time, is repeatedly beaten
Opening/repeatedly closing then can get multiple change value of pressure, can further be dropped by the comprehensive analysis to multiple change value of pressure
Low error in judgement, so that air-leakage test result is more accurate；And the flowing control group with several mutually isolated outlet end
Therefore the combination of the gas operated device and solenoid valve that are functionally equivalent in embodiment one of part 1 ' may make that structure is more succinct, body
Product is smaller, while thus reducing the cost for implementing the detection method.
As shown in figure 5, it is similar, also portable power supply device 8 (such as rechargeable lithium battery) can be connected into the control simultaneously
Unit 4 processed and flowing control assembly 1 ' can also be carried out even if under conditions of the supply of the unregulated powers such as field above-mentioned airtight as a result,
The inspection and continuous sampling of property
Other process embodiments are the same as example 1, and details are not described herein.
Embodiment three:
A kind of passive type method of sampling of gas is present embodiments provided, referring to Fig.1-2 comprising following steps:
S1, several closed container P1...Pn of preparation；
S2, the detection that gas flow channel air-tightness is completed according to detection method described in embodiment one；
It is each described by single 4 setting of the control after S3, at least one gas flow channel air-tightness to be determined are intact
The time point that flowing control assembly at least opens primary (such as 2 times or more), opens every time is (as setting is beaten for 10 points, 11 points in the morning
Open, or the time point opened every time determined by timing (after timing 10min)) and each time persistently opened is (such as every time
The time of opening continues 10-15s (preferably 12s)；
And S4, successively by the inlet end of each flowing control assembly by air guide component 1, flow adjust component 3 be connected to
Gaseous environment (such as atmospheric environment) with predetermined pressure, and the air inlet that flow adjusts component 3 and closed container is opened, lead to
It crosses described control unit and controls each flowing control assembly and at least opens that primary (preferably 2 times or more, it is continuous for only opening primary
Sampling, opening 2 times or more are then intermittent sampling), and 10-15s (preferably 12s) is opened every time, so that having pre- level pressure
Gas in the gaseous environment of power is flowed into the closed container for connection of being corresponding to it by a gas flow channel and is stored,
Successively repeatedly, it is stored until acquiring corresponding gaseous sample into corresponding closed container；And each closed container is sampling
Pressure≤0.01psi before air inlet in the closed container；
For example, the inlet end of previous flowing control assembly V1 is first passed sequentially through air guide component 1, flow adjusts component 3 and connects
The logical gaseous environment with predetermined pressure, and the air inlet that flow adjusts component 3 and closed container is opened, pass through the control
Unit 4 controls previous flowing control assembly V1 and automatically opens for 10 points in the morning, and at least opens once, opens 10-15s every time,
So that the gaseous sample in the gaseous environment with predetermined pressure is flowed into the company of being corresponding to it by gas sampling channel S1
It is stored in the closed container P1 connect, then described control unit 3 controls previous flowing control assembly V1 and closes；It is successively anti-
It is multiple, until described control unit 4 controls the last one flowing control assembly Vn and closes, the interval of several gaseous samples is completed with this
Or continuous acquisition.
In the present embodiment, can by the flow adjust component 3 complete detection when gas flow control, realize constant current into
Gas.Specifically, as shown in figure 3, constriction 9 is generally cylindrical, and the distribution channel 91 of different pore size runs through setting along axis,
Different pore size corresponds to different flow rates, such as 0.5ml/min-5ml/min, 3ml/min-20ml/min and 20ml/min-
50ml/min etc.；Compared with flow control valve, due to constriction 9 have different pore size distribution channel 91, user can according into
Flow velocity needed for gas selects constriction properly with a certain aperture distribution channel, carries out more accurate adjust to flow velocity with this；
In contrast, the flow velocity adjustable range of flow control valve is wider, and any stream can be adjusted between 0.5ml/min-300ml/min
Speed, user can select according to actual adjusting；In addition, the flow adjusts component 3 and the gas with predetermined pressure
It is additionally provided with filter 10 between body environment, is achieved in the filtering to particulate matter in gaseous environment, avoids gas sampling channel quilt
Blocking, it is preferred that the filter 10 is made of full polytetrafluoroethylene (PTFE) material, and pore size filter is 0.2 μm.
Example IV:
The present embodiment is also provided that a kind of passive type method of sampling of gas, referring to shown in Fig. 4-5, with embodiment three
The difference is that only:
S2, the detection that gas flow channel air-tightness is completed according to detection method described in embodiment two；
After S3, at least one gas flow channel air-tightness to be determined are intact, each institute is set by described control unit
It states fluid channel and at least opens primary (preferably open 2 times or more, only opening once is continuous sampling, between opening 2 times or more and being then
Have a rest sampling), time point for opening every time (such as 10 points in the morning, 11 points openings of setting, or pass through timing (after timing 10min)
Determine time point for opening every time) and (time such as opened every time continues 10-15s (preferably time for persistently opening every time
12s)；
And S4, by the common end 101 of flowing control assembly 1 ' in embodiment two by flow adjust component 3 connection have
The gaseous environment (such as atmospheric environment) of predetermined pressure, and the air inlet that flow adjusts component 3 and closed container is opened, pass through institute
It states each fluid channel of control unit control and at least opens primary (preferably opening 2 times or more), and the time opened every time continues
10-15s (preferably 12s), so that the gas in the gaseous environment with predetermined pressure passes through a gas flow channel stream
Enter into the closed container for connection of being corresponding to it and stored, successively repeatedly, until acquiring corresponding gaseous sample to correspondence
Closed container in store.
Other process embodiments are identical as embodiment three, and details are not described herein.
Embodiment five:
Present embodiments provide a kind of gas passive type sampling apparatus of the method for sampling described in achievable embodiment three, reference
Fig. 1-2, shown in 6 comprising:
Several closed container P1..Pn；
Gas flow module comprising several flowing control assembly V1...Vn, an air guide component 1, a pressure gauge 2 and
One flow control assembly 3, one end of each flowing control assembly adjust component 3 with air guide component 1, flow and are connected to formation one solely
Vertical gas flow channel S1...Sn, the air inlet of the other end one closed container of corresponding connection；The flow adjusts component 3
For adjusting gas flow rate when sampling, and the constriction including flow control valve and/or with different pore size distribution channel 91
9；The pressure gauge 2 be used for when and a certain gas flow channel (such as gas flow channel S1) open when, show its correspond to be connected to
Closed container (such as container P1) in change value of pressure；
Control unit 4 connects each flowing control assembly, beats for automatically controlling the flowing control assembly
Opening/closing opens/closes corresponding gas flow channel with this；In the present embodiment, described control unit 4 automatically controls described
The mode that flowing control assembly opens/closes is identical as embodiment three, and details are not described herein；
And filter 10, one end connect the flow and adjust component 3, other end connection has the gas of predetermined pressure
Environment；
Preferably, the air guide component 1, pressure gauge 2 and flow adjust component 3 and can be connected by three-way connection 5；Together
When, the passive type continuous sampling device further include:
Display unit 6 (such as display screen) connects the pressure gauge 2, for receiving and showing that the pressure gauge 2 is sent
Change value of pressure；
And/or reminding unit 7 (such as acoustic-optic alarm), the pressure gauge 2 is connected, for working as the pressure gauge 2
The change value of pressure is sent to while the display unit 6 is shown and generates alerting signal.
Embodiment six:
The passive type sampling apparatus for present embodiments providing the method for sampling described in a kind of achievable example IV, referring to figure
4a-5, shown in 7 comprising:
Several closed container P1..Pn；
Gas flow module a comprising flowing control assembly 1 ', a pressure gauge 2 and a flow adjust component 3, and institute
Flowing control assembly 1 ' is stated with a common end 101 and several mutually isolated outlet end 102,103,104,105...N, institute
State common end 101 be connected to an outlet end to be formed an independent fluid channel S1 ', S2 ' ... Sn '；The flowing control assembly
The corresponding connection one closed container (such as container P1, container P2... container Pn) in 1 ' each outlet end, so that each gas
Flow channel one closed container of corresponding connection, while common end 101 is connected to flow and adjusts component 3, so that each fluid channel
Component 3 is adjusted with flow is connected to one gas flow channel S1...Sn of formation；Likewise, the flow adjusts component 3 for adjusting
Gas flow rate when section sampling, and including flow control valve and/or with the constriction 9 of different pore size distribution channel 91；It is described
Pressure gauge 2 be used for when and a certain gas flow channel (such as gas flow channel S1) open when, show its correspond to be connected to it is closed
Change value of pressure in container (such as container P1)；
Control unit 4 connects the flowing control assembly 1 ', opens/closes for automatically controlling the fluid channel,
Opening/closing for gas flow channel corresponding with each fluid channel is controlled with this；In the present embodiment, described control unit 4
Automatically control that the mode that the flowing control assembly opens/closes is identical as example IV, and details are not described herein；
And filter 10, one end connect the flow and adjust component 3, other end connection has the gas of predetermined pressure
Environment.
Preferably, the flowing control assembly 1 ', pressure gauge 2 and flow adjust component 3 and can be connected by three-way connection 5
It connects；The setting of display unit 6 and reminding unit 7 is identical as embodiment five, and details are not described herein.
It should be noted that the technical characteristic in above-described embodiment one to six can carry out any combination, and be composed
Technical solution belongs to the protection scope of the application.
In conclusion the present invention can under conditions of unregulated power is supplied at times, complete independently atmospheric volatile organises
Close object accomplished continuously or intermittently, passive type sampling, while can avoid sampling when there are problems that adsorb.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of detection method of gas flow channel air-tightness, which comprises the steps of:
S1, preparation include the gas stream that several flowing control assemblies, an air guide component, a pressure gauge and a flow adjust component
Dynamic component, one end of each flowing control assembly, which adjusts component with air guide component, flow and forms an independent gas and flow, to be led to
Road, the air inlet of the other end one closed container of corresponding connection；
S2, each flowing control assembly is all connected with to control unit, and the pressure gauge is installed；
S3, the inlet end that the flow adjusts component is blocked, opens the air inlet of closed container, and the flow is adjusted into component
Flow velocity be set as maximum；
And it S4, each flowing control assembly is automatically controlled by described control unit opens/closes, and a certain flowing control group
When part is opened, show that it corresponds to the pressure change in the closed container of connection by the pressure gauge, and sentence according to pressure change
The air-tightness of disconnected corresponding gas flow channel.
2. detection method as described in claim 1, which is characterized in that in the step S4, controlled by described control unit
The process that each flowing control assembly opens/closes includes:
S41, each flowing control assembly is set by control unit at least opening once, the time opened every time is 10-
15s；
And S42, one end of each flowing control assembly connection air guide component, flow successively adjusted into component, and by described
Control unit successively controls each flowing control assembly and at least opens once, and the time opened every time continues 10-15s.
3. a kind of detection method of gas flow channel air-tightness, which comprises the steps of:
S1, preparation include the gas flow module that a flowing control assembly, a pressure gauge and a flow adjust component, and described
Flowing control assembly has a common end and several mutually isolated outlet end, and the common end is connected to be formed with an outlet end
One independent fluid channel, each fluid channel adjust component with flow and are connected to form a gas flow channel；
S2, the flowing control assembly is connected to control unit, and the pressure gauge is installed；
S3, the inlet end that the flow adjusts component is blocked, opens the air inlet of closed container, and the flow is adjusted into component
Flow velocity be set as maximum；
And S4, opening/closing for each fluid channel in the flowing control assembly is automatically controlled by described control unit,
Opening/closing for gas flow channel corresponding with each fluid channel is controlled with this, and when a certain gas flow channel opening,
It shows that it corresponds to the pressure change in the closed container of connection by the pressure gauge, and corresponding gas is judged according to pressure change
The air-tightness of flow channel.
4. detection method as claimed in claim 3, which is characterized in that automatic by described control unit in the step S4
Controlling the process that each fluid channel opens/closes in the flowing control assembly includes:
S41, each fluid channel is set by control unit at least opening once, the time opened every time is 10-15s；
And S42, the common end connection flow adjusting component by the flowing control assembly, and successively by described control unit
It controls each fluid channel at least to open once, and the time opened every time continues 10-15s.
5. detection method as claimed in claim 2 or 4, which is characterized in that in the step S4, the pressure gauge connection display
Unit, as the change value of pressure > 0.01psi that the pressure gauge is shown, which is sent to institute by the pressure gauge
Display unit is stated to be shown.
6. detection method as claimed in claim 2 or 4, which is characterized in that in the step S4, the pressure gauge connection is reminded
Unit, while the change value of pressure is sent to the display unit by the pressure gauge to be shown, the prompting is single
Member generates alerting signal.
7. a kind of passiveness sampling method of gas, which comprises the steps of:
S1, several closed containers of preparation；
S2, the detection that gas flow channel air-tightness is completed according to detection method as claimed in claim 1 or 3；
S3, the time point that the flowing control assembly opening is set by described control unit and the time persistently opened；
And S4, the inlet end of flowing control assembly is adjusted into component connection by air guide component, flow there is predetermined pressure
Gaseous environment, and open the air inlet that flow adjusts component and closed container；Described control unit controls flowing control assembly
Open/close, thus corresponding gaseous sample is acquired by corresponding gas flow channel into corresponding closed container
Storage.
8. a kind of passive sampling apparatus of gas characterized by comprising
Several closed containers；
Gas flow module comprising several flowing control assemblies, an air guide component and a flow adjust component, each flowing
One end of control assembly adjusts component and is connected to form an independent gas flow channel with air guide component, flow, and the other end is equal
The air inlet of one closed container of corresponding connection；
Control unit connects each flowing control assembly, beats ON/OFF for automatically controlling the flowing control assembly
It closes, corresponding gas flow channel is opened/closed with this；
And filter, one end connect the flow and adjust component, other end connection has the gaseous environment of predetermined pressure；
Or, including:
Several closed containers；
Gas flow module a comprising flowing control assembly and a flow adjust component, and the flowing control assembly has
There are a common end and a several mutually isolated outlet end, the common end is connected to that form an independent fluid logical with an outlet end
Road；Each outlet end of the flowing control assembly one closed container of corresponding connection, common end are connected to flow and adjust component, make
Each fluid channel is obtained to be connected to form a gas flow channel with flow adjusting component.
Control unit is connected the flowing control assembly, opens/closes for automatically controlling the fluid channel, controlled with this
Make opening/closing for gas flow channel corresponding with each fluid channel；
And filter, one end connect the flow and adjust component, other end connection has the gaseous environment of predetermined pressure.
9. sampling apparatus as claimed in claim 8, which is characterized in that the passive type sampling apparatus of the gas further include: pressure
Power table is used for when a certain gas flow channel is opened, in the closed container of display connection corresponding with the gas flow channel
Pressure change.
10. sampling apparatus as claimed in claim 9, which is characterized in that it includes: flow control valve that the flow, which adjusts component,
And/or the constriction with different pore size distribution channel.
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