CN109900530A - A kind of method of sampling and device for gaseous sample sampling - Google Patents
A kind of method of sampling and device for gaseous sample sampling Download PDFInfo
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- CN109900530A CN109900530A CN201910290344.3A CN201910290344A CN109900530A CN 109900530 A CN109900530 A CN 109900530A CN 201910290344 A CN201910290344 A CN 201910290344A CN 109900530 A CN109900530 A CN 109900530A
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Abstract
The invention discloses a kind of method of sampling and device for gaseous sample sampling, steps of the method are: step S1: gas storage units is enabled to enter aeration status；Step S2: according to the pressure value between pressure value in the gas storage units of real-time detection, and/or gas storage units input end and sampling environment in gas circuit, the air velocity that real-time control enters gas storage units is given threshold；Until completing sampling.The device is used to implement the above method.The present invention has many advantages, such as that structure is simple, easy to operate, applied widely, high degree of automation.
Description
Technical field
Present invention relates generally to gaseous sample sample detecting fields, refer in particular to a kind of sampling side for gaseous sample sampling
Method and device.
Background technique
In some fields for needing to detect gaseous sample, generally require to set by the specific method of sampling and sampling
It is standby that gaseous sample is sampled, for example, when being detected to atmosphere, environment air sample, it is necessary to air sample into
Row is continuous, accurately samples.The ambient air sampling can be garbage disposal and the gaseous sample of other field.
In the prior art, generally Soviet Union's Ma tank is vacuumized (- 14.5PSI), then using Soviet Union's Ma tank as storage medium
The sample acquisition of certain time is carried out to surrounding air, obtained sample can represent the air average assay in certain time and contain
Amount.This Soviet Union's Ma tank is as defined in US EPA air monitering for acquiring the one of storage VOC gas (volatile organic compounds)
Kind air sampling tank.The inner surface of tank passes through Passivation Treatment, keeps stablizing to guarantee composition in storage, valve generallys use height
Quality, metal to metal seal, stainless steel film 2/3- rotary valve, valve and transfer line have heating function more, it is ensured that eliminate
Sample is resident.
In above-mentioned sampling process, the requirement with " flow restriction ", the requirement of so-called " flow restriction " refers to: such as 6L
Revive Ma tank, if require sampling 3 hours, flow be about 33mL/min (sampling may need to leave certain vacuum degree, because
This may not generally adopt full 6L).If flow speed be it is constant always, what is sampled every time is representative just relatively high, such as
Fruit flow is non-constant, and in 3 hour sampling processes, same harmful components concentration (having discharge in a certain short time) exists
The sample concentration that 3 hours leading portions and back segment are collected is inconsistent.
In above-mentioned sampling process, also there is certain requirement to " timing sampling ", so-called " timing sampling " refers to: a side
Face is sampling process is fixed timing how long, another aspect is Soviet Union's Ma tank in field or is distributed in certain region, meeting
There is the requirement sampled since some time is on time.Such as 3 sets of sample devices are placed in some sampled point now, No. 1 tank is in star
9 points of phase a whole morning start acquisition 3 hours, and No. 2 tanks start acquisition 6 hours at 12 points of Tuesday, and No. 3 tanks are at 6 points of Wednesday morning
Start acquisition 24 hours.
Currently, the product of each producer is to be mounted on Soviet Union's Ma canister incoming gas mouth using mechanical current limiter.The hand when needing to sample
The dynamic air valve for opening Soviet Union's Ma tank carries out sample acquisition by mechanical current-limiting mode.This current limiter is mostly using aperture or tubule
Or the principles such as mechanical flow-limiting valve carry out " flow restriction ".It is existing using it is above-mentioned using mechanical current limiter (aperture, capillary,
Or flow valve etc.) structure, carry out simple current limliting by aperture or capillary merely, or simple by pressure sensitive elastic slice
The size of aperture is adjusted to limit flow (similar and flow valve), current limliting, manually opened and closing are carried out to Soviet Union's Ma tank sampling.This
Kind mode and structure have the disadvantage that
1, full manual operation, valve opening and pass valve needs manually go to operate on time, the particularly disadvantageous need in timing sampling etc. functionally
It asks.
2, the mechanical current limiter (aperture or capillary, flow-limiting valve) that flow restriction uses, since sampling process is Soviet Union's Ma
Tank (vacuumize, clean before sampling) is slowly filled up to the process of atmosphere from vacuum.Therefore the pressure at current limiter both ends is linearly to become
Small.So mechanical current limiter can not accomplish what flow was kept constant in the whole process, its flow is with pressure difference
Become smaller, and gradually smaller, the particularly disadvantageous demand in " flow restriction ", " timing sampling " etc. functionally.
3, the size of current limiter selected depending on the sampling time, was difficult to select or adjust to suitable.
4, in the environment of some special operation conditions, it is excessive due to air humidity the problems such as, it will influence mechanical current limliting
The using effect of device is unable to get preferable regulating effect.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind of structure is simple, easy to operate, applied widely, high degree of automation the method for sampling and dress for gaseous sample sampling
It sets.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of method of sampling for gaseous sample sampling, the steps include:
Step S1: gas storage units are enabled to enter aeration status；
Step S2: according to pressure value in the gas storage units of real-time detection, and/or gas storage units input end and sampling ring
Pressure value between border in gas circuit, the air velocity that real-time control enters gas storage units is given threshold；Until completing to adopt
Sample.
Further improvement as the method for the present invention: it in the step S1, after first vacuumizing gas storage units, then beats
Valve opening access unit, makes it into aeration status.
Further improvement as the method for the present invention: the valve access unit is installed in gas storage units or independence
It is installed in gas storage units, for making gas storage units enter aeration status, plays the function of closing or opening.
Further improvement as the method for the present invention: in the step S2, by more than one pressure sensor come real
When detection gas storage unit in pressure between pressure value, and/or gas storage units input end and sampling environment in gas circuit
Value.
Further improvement as the method for the present invention: the pressure sensor is installed on gas storage units input end and adopts
In gas circuit between sample environment.
Further improvement as the method for the present invention: it in the step S2, is controlled in real time by more than one proportioning valve
System enters the air velocity of gas storage units.
Further improvement as the method for the present invention: the proportioning valve is installed on gas storage units input end and sampling ring
In gas circuit between border.
Further improvement as the method for the present invention: it in the step S1 and S2, is carried out by micro-control unit MCU
Control.
Further improvement as the method for the present invention: gas storage units are provided on the micro-control unit MCU
Opening/closing time, micro-control unit MCU are waited, after the time reaches setting date-time, make gas storage units by control
Into aeration status.
Further improvement as the method for the present invention: it is provided with communication unit on the micro-control unit MCU, utilizes this
Communication unit is attached by WIFI, bluetooth or 4G communication mode and user.
Further improvement as the method for the present invention: in the step S2, according to pressure sensor feedback pressure value and
The calculated rate of pressure rise of time relationship, adjusts the opening degree of proportioning valve, and control gas enters gas storage units
Air velocity is setting flow velocity；Rate of pressure rise setting and calculating are as follows:
V =(Pe-Ps)/T
Wherein, V: rate of pressure rise, unit PSI/S；Pe: gas storage units initiation pressure；Ps: when sampling terminates
Pressure.
It is described the present invention further provides a kind of sampling apparatus for gaseous sample sampling, including gas storage units
The inlet end of gas storage units is connected by gas circuit with atmosphere or gas source to be sampled, is arranged in the gas circuit more than one
Pressure sensor, the pressure sensor be used in real-time detection gas storage units pressure value, and/or gas storage units into
Pressure value between mouth end and sampling environment in gas circuit；More than one proportioning valve is set in the gas circuit, the proportioning valve according to
The pressure value real-time control of the pressure sensor monitoring enters the air velocity of gas storage units.
Further improvement as apparatus of the present invention: the inlet end of the gas storage units is provided with valve access unit,
The valve access unit is installed in gas storage units or installs independently of gas storage units, for keeping gas storage single
Member enters aeration status, plays the function of closing or opening.
Further improvement as apparatus of the present invention:, it further include micro-control unit MCU, for receiving pressure sensor
Monitoring signals, and comparative example valve is controlled.
Further improvement as apparatus of the present invention: further including micro-control unit MCU, for receiving the prison of pressure sensor
Signal is surveyed, and the valve access unit and proportioning valve of gas storage units are controlled.
Further improvement as apparatus of the present invention: communication unit, the communication are provided on the micro-control unit MCU
Unit is attached by WIFI, bluetooth or 4G communication mode and user.
Compared with the prior art, the advantages of the present invention are as follows: the method for sampling for gaseous sample sampling of the invention and
Device, structure is simple, easy to operate, applied widely, high degree of automation, by the size of monitoring pressure in real time value come to whole
The process of a gas inflow gas storage unit carries out real-time control, is not only able to meet flow and quantitative reality in collection process
Border demand, additionally it is possible to which the accuracy for guaranteeing entire sampling overall process reaches optimal sample effect, finally adopts to really improve
The integrality and representativeness of all product.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for sampling of the present invention.
Fig. 2 is sampling apparatus of the present invention schematic illustration in a specific embodiment.
Marginal data:
1, gas storage units；2, valve access unit；3, pressure sensor；4, proportioning valve；5, micro-control unit.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
As depicted in figs. 1 and 2, a kind of method of sampling for gaseous sample sampling of the invention, the steps include:
Step S1: gas storage units 1(such as Soviet Union's Ma tank are enabled) enter aeration status；
Step S2: according to pressure value in the gas storage units 1 of real-time detection, and/or 1 input end of gas storage units and sampling
Pressure value between environment in gas circuit, the air velocity that real-time control enters gas storage units 1 is given threshold；Until completing
Sampling.
In above-mentioned steps S1, according to actual needs, after first gas storage units 1(such as Soviet Union's Ma tank) can be vacuumized,
Valve access unit 2 is opened again, makes it into aeration status.Valve access unit 2 be installed in gas storage units 1 or independently of
Gas storage units 1 are installed, and function is to play closing or opening for making gas storage units 1 enter aeration status
Function.
It, according to actual needs, can be by more than one pressure sensor 3 come real-time detection in above-mentioned steps S2
Pressure value in gas storage units 1 between pressure value, and/or 1 input end of gas storage units and sampling environment in gas circuit.Institute
Stating sampling environment is atmosphere or gas source to be sampled.
In above-mentioned steps S2, according to actual needs, gas can be entered come real-time control by more than one proportioning valve 4
The air velocity of body storage unit 1.In specific application, proportioning valve 4 can be installed on to 1 input end of gas storage units and adopted
In gas circuit between sample environment, which can be vent line.Proportioning valve 4 can use electronically controlled proportional valve according to actual needs
4。
In above-mentioned steps, it can be used to connect by micro-control unit 5MCU (Microcontroller Unit, MCU)
The monitoring signals of pressure sensor 3 are received, and the valve access unit 2 and proportioning valve 4 of gas storage units 1 are controlled.Micro-control
Unit 5MCU processed can be used to realize the instant shut-in of valve access unit 2 or the time switch of valve access unit 2, then microcontroller
Unit 5MCU collects the pressure value that pressure sensor 3 transmits, and after making analytical judgment, issues control instruction to proportioning valve 4, utilizes
Proportioning valve 4 carrys out real-time control to enter the air velocity of gas storage units 1 to be given threshold.After reaching the sampling time, gas at this time
Body storage unit 1 by internal close to atmospheric pressure after predetermined flow rate acquisition, micro-control unit 5MCU control close proportioning valve 4 and/or
Valve access unit 2.
Under a kind of operating condition, the opening/closing time of gas storage units 1, microcontroller list are provided on micro-control unit 5MCU
First 5MCU is waited, after the time reaches setting date-time, and proportioning valve 4 and/or valve access unit 2 are opened in control, make gas
Storage unit 1(such as Soviet Union's Ma tank) enter aeration status.
In specific application example, it is provided with communication unit on micro-control unit 5MCU, can be led to using the communication unit
It crosses the communication modes such as WIFI, bluetooth or 4G and user (operator) is attached.User (operator) can in host computer or
Come to carry out parameter setting to micro-control unit 5MCU on mobile terminal.The parameter include valve access unit 2 opening/closing time, into
Enter the air velocity threshold value etc. of gas storage units 1.
In specific application example, the Soviet Union's Ma pressure tank size and time relationship fed back according to pressure sensor 3 are calculated
Rate of pressure rise, adjust proportioning valve 4 opening degree, control atmosphere enter Soviet Union Ma tank air velocity for setting flow velocity.
Rate of pressure rise setting and calculating:
V =(Pe-Ps)/T
V: rate of pressure rise, unit PSI/S
Pe: Soviet Union's Ma tank initiation pressure, generally -14PSI,
Ps: pressure, generally -2PSI when sampling terminates,
Small by reason of heavy pressure and gas volume is journey direct ratio, therefore controls pressure and rise according to fixed rate, then flows into Soviet Union
The flow of Ma tank is also constant.
As shown in Fig. 2, the present invention further provides a kind of sampling apparatus for gaseous sample sampling, including gas storage
Unit 1(such as Soviet Union's Ma tank), the inlet end of the gas storage units 1 is connected by gas circuit with atmosphere or gas source to be sampled；This hair
Bright that more than one pressure sensor 3 is arranged in the gas circuit, it is single that the pressure sensor 3 is used to the storage of real-time detection gas
Pressure value in member 2 between pressure value, and/or 2 input end of gas storage units and sampling environment in gas circuit；In the gas circuit
More than one proportioning valve 4 is set, which enters gas according to the pressure value real-time control that the pressure sensor 3 monitors
The air velocity of body storage unit 1.Sampling apparatus of the invention can be used to implement the above-mentioned method of sampling of the present invention.
Further, in specific application example, the inlet end of gas storage units 1 is provided with valve access unit 2, which connects
Enter unit 2 to be installed in gas storage units 1 or install independently of gas storage units 1, function is for making gas
Storage unit 1 enters aeration status, plays the function of closing or opening.
Further, in specific application example, further include a micro-control unit 5MCU (Microcontroller Unit,
MCU), valve access unit 2 and proportioning valve 4 for receiving the monitoring signals of pressure sensor 3, and to gas storage units 1 into
Row control.Micro-control unit 5MCU can be used to realize that the timing of the instant shut-in or valve access unit 2 of valve access unit 2 is opened
It closes, then micro-control unit 5MCU collects the gas pressure value that pressure sensor 3 transmits, and after making analytical judgment, issues control
It instructs to proportioning valve 4, proportion of utilization valve 4 carrys out real-time control to enter the air velocity of gas storage units 1 to be given threshold.Reach
After sampling time, gas storage units 1 are by internal close to atmospheric pressure, micro-control unit 5MCU control after predetermined flow rate acquisition at this time
Close proportioning valve 4 and/or valve access unit 2.
Further, in specific application example, it is provided with communication unit on micro-control unit 5MCU, utilizes the communication list
Member can be attached by the communication modes such as WIFI, bluetooth or 4G and user (operator).User (operator) can be upper
Come to carry out parameter setting to micro-control unit 5MCU on position machine or mobile terminal.The parameter includes opening for valve access unit 2
Close the time, into air velocity threshold value of gas storage units 1 etc..
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (16)
1. a kind of method of sampling for gaseous sample sampling, which is characterized in that step are as follows:
Step S1: gas storage units are enabled to enter aeration status；
Step S2: according to pressure value in the gas storage units of real-time detection, and/or gas storage units input end and sampling ring
Pressure value between border in gas circuit, the air velocity that real-time control enters gas storage units is given threshold；Until completing to adopt
Sample.
2. the method for sampling according to claim 1 for gaseous sample sampling, which is characterized in that in the step S1,
After first gas storage units are vacuumized, then valve access unit is opened, makes it into aeration status.
3. the method for sampling according to claim 2 for gaseous sample sampling, which is characterized in that the valve access unit
It is installed in gas storage units or is installed independently of gas storage units, for making gas storage units enter ventilation shape
State plays the function of closing or opening.
4. the method for sampling according to claim 1 or 2 or 3 for gaseous sample sampling, which is characterized in that the step
In S2, by more than one pressure sensor come pressure value, and/or gas storage units in real-time detection gas storage units
Pressure value between input end and sampling environment in gas circuit.
5. the method for sampling according to claim 4 for gaseous sample sampling, which is characterized in that the pressure sensor
It is installed on gas storage units input end and samples in the gas circuit between environment.
6. the method for sampling according to claim 1 or 2 or 3 for gaseous sample sampling, which is characterized in that the step
In S2, enter the air velocity of gas storage units come real-time control by more than one proportioning valve.
7. the method for sampling according to claim 6 for gaseous sample sampling, which is characterized in that the proportioning valve installation
In gas circuit between gas storage units input end and sampling environment.
8. the method for sampling according to claim 1 or 2 or 3 for gaseous sample sampling, which is characterized in that in the step
In rapid S1 and S2, controlled by micro-control unit MCU.
9. the method for sampling according to claim 8 for gaseous sample sampling, which is characterized in that in the microcontroller list
The opening/closing time of gas storage units is provided on first MCU, micro-control unit MCU is waited, when the time reaching the setting date
Between after, by control so that gas storage units is entered aeration status.
10. the method for sampling according to claim 8 for gaseous sample sampling, which is characterized in that in the microcontroller
It is provided with communication unit on unit MCU, is connected using the communication unit by WIFI, bluetooth or 4G communication mode and user
It connects.
11. the method for sampling according to claim 6 for gaseous sample sampling, which is characterized in that in the step S2,
According to the pressure value and the calculated rate of pressure rise of time relationship of pressure sensor feedback, the opening journey of proportioning valve is adjusted
Degree, control gas enter the air velocity of gas storage units for setting flow velocity；Rate of pressure rise setting and calculating are as follows:
V =(Pe-Ps)/T
Wherein, V: rate of pressure rise, unit PSI/S；Pe: gas storage units initiation pressure；Ps: when sampling terminates
Pressure.
12. a kind of sampling apparatus for gaseous sample sampling, including gas storage units, the air inlet of the gas storage units
End is connected by gas circuit with atmosphere or gas source to be sampled, which is characterized in that
More than one pressure sensor is set in the gas circuit, and the pressure sensor is used to real-time detection gas storage units
Pressure value between middle pressure value, and/or gas storage units input end and sampling environment in gas circuit；
More than one proportioning valve is set in the gas circuit, and the proportioning valve is real-time according to the pressure value of the pressure sensor monitoring
Control enters the air velocity of gas storage units.
13. the sampling apparatus according to claim 12 for gaseous sample sampling, which is characterized in that the gas storage
The inlet end of unit is provided with valve access unit, and the valve access unit is installed in gas storage units or independently of gas
Storage unit installation, for making gas storage units enter aeration status, plays the function of closing or opening.
14. the sampling apparatus according to claim 12 for gaseous sample sampling, which is characterized in that further include microcontroller
Unit MCU, for receiving the monitoring signals of pressure sensor, and comparative example valve is controlled.
15. the sampling apparatus according to claim 13 for gaseous sample sampling, which is characterized in that further include microcontroller
Unit MCU for receiving the monitoring signals of pressure sensor, and carries out the valve access unit and proportioning valve of gas storage units
Control.
16. the sampling apparatus according to claim 14 or 15 for gaseous sample sampling, which is characterized in that the micro-control
Communication unit is provided on unit MCU processed, the communication unit is connected by WIFI, bluetooth or 4G communication mode and user
It connects.
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| CN201910290344.3A CN109900530A (en) | 2019-04-11 | 2019-04-11 | A kind of method of sampling and device for gaseous sample sampling |
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| CN105158419A (en) * | 2015-08-25 | 2015-12-16 | 江苏远望仪器有限公司 | Pumping type gas sampling monitoring device |
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