CN214538814U - Metering device for flow meter in ambient air sampler - Google Patents
Metering device for flow meter in ambient air sampler Download PDFInfo
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- CN214538814U CN214538814U CN202120550612.3U CN202120550612U CN214538814U CN 214538814 U CN214538814 U CN 214538814U CN 202120550612 U CN202120550612 U CN 202120550612U CN 214538814 U CN214538814 U CN 214538814U
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- air
- pressure gauge
- flow meter
- air inlet
- digital pressure
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- 239000012080 ambient air Substances 0.000 title claims abstract description 17
- 239000003570 air Substances 0.000 claims abstract description 71
- 238000005070 sampling Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000013076 target substance Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006806 disease prevention Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model discloses a metering device for a flowmeter in an ambient air sampler, which comprises a digital pressure gauge, a mass flow meter and an air resistance simulator with a pressing spring, wherein the air inlet of the digital pressure gauge is provided with an air inlet pipe, the air outlet of the digital pressure gauge is communicated with the air inlet of the mass flow meter through a connecting pipe, and the air outlet of the mass flow meter is provided with an air outlet pipe; the air resistance simulator is arranged on the air inlet pipe; the air inlet pipe, the air outlet pipe and the connecting pipe are all made of vulcanized elastic rubber. The actual use working condition of the to-be-tested environment air sampler under different resistance conditions can be quantitatively simulated through the air resistance simulator, and then the accuracy of flow parameters in the to-be-tested environment air sampler is investigated.
Description
Technical Field
The utility model relates to a measurement technique, more specifically say, relate to a calibration under the simulation operating mode condition and examine and determine metering device of flow parameter in the ambient air sample thief.
Background
The environmental air sampler is an instrument for collecting gaseous pollutants in the atmospheric environment, and is widely applied to the fields of atmospheric environment monitoring, disease prevention and control, public health epidemic prevention, labor protection, environmental science research and the like. The sampler device generally comprises a sampling pump (for providing power), a flowmeter, a timer, a connecting pipeline and the like. After sampling begins, the sampling time is set, typically by controlling the flow rate, to obtain a total sample volume over a time range. When the concentration of the sampling substance is analyzed, the mass of the target substance is divided by the sampling volume to obtain the target substance. Therefore, the flow parameters of the ambient air sampler need to be measured to ensure the accuracy and the scientificity of the values.
However, in the sampling condition of the ambient air sampler, it is usually necessary to dispose a gas absorption liquid, and the sampled ambient air must pass through the absorption liquid to adsorb the target gas, and in this process, a certain resistance is objectively generated, and in addition, a frictional resistance also exists in the connecting pipeline, which may cause the distortion of the flow meter reading carried by the ambient air sampler. During metering, this problem cannot be solved by flow calibration under no-load, no-condition conditions only.
In the prior art, part of metering devices do not consider the simulation working condition, and the flow meters of the samplers are only calibrated by the higher-level flow meters, so that the flow state under the actual use condition cannot be reflected. Although some devices are provided with resistance simulation components and the superposed mechanical micro-differential pressure gauge displays the simulated resistance, the resistance is adjusted manually, the numerical reading of the differential pressure gauge depends on visual identification, and the differential pressure gauge has larger errors and unstable reading and cannot be accurately carried out according to the requirements of the verification regulations. In addition, the flow calibration result is displayed by an independent and externally connected high-level flowmeter, the metering result cannot be stored or directly generated, the results of multiple tests need to be manually recorded, and errors are easy to generate.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art, the utility model aims at providing a metering device for flowmeter in ambient air sample thief.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a metering device for a flow meter in an ambient air sampler comprises a digital pressure meter, a mass flow meter and an air resistance simulator with a pressing spring, wherein an air inlet pipe is arranged at an air inlet of the digital pressure meter, an air outlet of the digital pressure meter is communicated with an air inlet of the mass flow meter through a connecting pipe, and an air outlet pipe is arranged at an air outlet of the mass flow meter;
the air resistance simulator is arranged on the air inlet pipe;
the air inlet pipe, the air outlet pipe and the connecting pipe are all made of vulcanized elastic rubber.
The length of the connecting pipe is shorter than that of an air inlet pipe between the digital pressure gauge and the air resistance simulator.
The length ratio of the connecting pipe to the length of the air inlet pipe between the digital pressure gauge and the air resistance simulator is 1: 2.
The maximum value of the measuring range of the digital pressure gauge is more than or equal to 20kPa, and the accuracy grade is more than or equal to 1.5 grade.
The measuring range of the mass flowmeter is 20-6000 mL/min.
Compared with the prior art, adopt the utility model discloses a metering device for flowmeter in ambient air sample thief, can quantify (read pressure data by digital pressure gauge) through the air resistance simulator and simulate the in-service use operating mode of the ambient air sample thief that awaits measuring under the different resistance conditions, and then survey the degree of accuracy of the ambient air sample thief flow parameter that awaits measuring.
As a further improvement scheme, the digital pressure gauge and the mass flow meter are connected with the memory, so that the measurement result numerical value of the pressure value measured by the digital pressure gauge and the flow value measured by the mass flow meter can be led out to the memory according to the set frequency, automatic recording is realized, the efficiency of the measurement work is improved, and errors possibly generated in the direct reading and recording process of personnel are avoided.
The utility model discloses still have simple structure, easily carry and be convenient for characteristics such as trace to the source.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
Referring to figure 1 a metering device for a flow meter in an ambient air sampler,
the device comprises a digital pressure gauge 11, a mass flow meter 12 and an air resistance simulator 13 with a pressing spring, wherein an air inlet pipe 14 is arranged at an air inlet of the digital pressure gauge, an air outlet of the digital pressure gauge is communicated with an air inlet of the mass flow meter through a connecting pipe 15, and an air outlet pipe 16 is arranged at an air outlet of the mass flow meter; the air resistance simulator 13 is arranged on the air inlet pipe 14; intake pipe 14, outlet duct 16 and connecting pipe 15 all adopt the elastic rubber through vulcanizing to make, and elastic rubber has good deformability usually, and the rubber through vulcanizing is difficult for weing and then avoids adsorbing impurity and cause the jam, consequently, it is comparatively suitable to adopt the rubber materials pipeline in the examination/calibration work.
The digital pressure gauge 11, the mass flow meter 12 and the air resistance simulator 13 with the pressing spring are placed on the same plane (such as a plastic panel), so that the resistance of the pipeline is reduced, and the continuity of the air flow during checking/correcting is ensured.
The pressure generated by a pressing spring on the air resistance simulator to the air inlet pipe is stable and uniform, and the pressure value is measured by a digital pressure gauge.
The maximum value of the measuring range of the digital pressure gauge is more than or equal to 20kPa, and the accuracy grade is more than or equal to 1.5 grade.
The measuring range of the mass flowmeter is 20-6000 mL/min.
Through repeated demonstration, when the length ratio of the connecting pipe 15 to the air inlet pipe 141 between the digital pressure gauge and the air resistance simulator is 1:2, the air flow in the checking process is most uniform, and the readings of the mass flow meter and the digital pressure gauge are stable. Particularly, when the length of the connection pipe is 150mm, and the length of the air inlet pipe between the digital pressure gauge and the air resistance simulator is 300mm, the above effect is best.
Preferably, the digital pressure gauge and the mass flow meter are connected with a memory (not shown in the figure), so that automatic recording of data is realized.
During the use, the sampling pump in the air sampler that awaits measuring links to each other with the export of outlet duct, open the air sampler's that awaits measuring power and start the sampling mode, extrude the intake pipe through opening the pressure spring on the air resistance simulator and produce the resistance and read this resistance value by the digital pressure gauge, require the ration to set up the resistance value (such as 0.5kPa or 4.5kPa) according to technical standard, adjust the flowmeter in the air sampler that awaits measuring to the numerical point of examining the examination/school afterwards, start mass flow meter, the frequency of setting data record, for example every 15 minutes record a set of data, can begin to measure the flowmeter in the sampler that awaits measuring. Then, the flow meter in the air sampler to be measured can be adjusted to other numerical points to be measured/corrected, and the measurement results of other flow points can be obtained by repeating the steps. Therefore, whether the flow of the ambient air sampler meets the technical standard or not can be judged according to the requirements in the metering technical specification.
It should be noted that, under the state that the air resistance simulator is not opened, the flow parameter of the ambient air sampler to be measured under the no-load condition can be measured.
It should be understood by those skilled in the art that the above embodiments are only for the purpose of illustration, and not for the purpose of limitation, for example, the metering device of the present invention can be either an integral structure or a split structure, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention.
Claims (6)
1. A metering device for a flow meter in an ambient air sampler,
the air resistance simulator comprises a digital pressure gauge, a mass flow meter and an air resistance simulator with a pressing spring, wherein an air inlet pipe is arranged at an air inlet of the digital pressure gauge, an air outlet of the digital pressure gauge is communicated with an air inlet of the mass flow meter through a connecting pipe, and an air outlet pipe is arranged at an air outlet of the mass flow meter;
the air resistance simulator is arranged on the air inlet pipe;
the air inlet pipe, the air outlet pipe and the connecting pipe are all made of vulcanized elastic rubber.
2. The metering device of claim 1, wherein:
the length of the connecting pipe is shorter than that of an air inlet pipe between the digital pressure gauge and the air resistance simulator.
3. The metering device of claim 1, wherein:
the length ratio of the connecting pipe to the length of the air inlet pipe between the digital pressure gauge and the air resistance simulator is 1: 2.
4. The metering device of claim 1, wherein:
the maximum value of the measuring range of the digital pressure gauge is more than or equal to 20kPa, and the accuracy grade is more than or equal to 1.5 grade.
5. The metering device of claim 1, wherein:
the measuring range of the mass flowmeter is 20-6000 mL/min.
6. The metering device of claim 1, wherein:
the digital pressure gauge and the mass flow meter are connected with a memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120550612.3U CN214538814U (en) | 2021-03-17 | 2021-03-17 | Metering device for flow meter in ambient air sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120550612.3U CN214538814U (en) | 2021-03-17 | 2021-03-17 | Metering device for flow meter in ambient air sampler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214538814U true CN214538814U (en) | 2021-10-29 |
Family
ID=78263874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120550612.3U Expired - Fee Related CN214538814U (en) | 2021-03-17 | 2021-03-17 | Metering device for flow meter in ambient air sampler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214538814U (en) |
-
2021
- 2021-03-17 CN CN202120550612.3U patent/CN214538814U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211029 |