CN112945891B - Air carbon monoxide measuring method and measuring instrument thereof - Google Patents
Air carbon monoxide measuring method and measuring instrument thereof Download PDFInfo
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- CN112945891B CN112945891B CN202110163376.4A CN202110163376A CN112945891B CN 112945891 B CN112945891 B CN 112945891B CN 202110163376 A CN202110163376 A CN 202110163376A CN 112945891 B CN112945891 B CN 112945891B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910002091 carbon monoxide Inorganic materials 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims description 20
- 238000005070 sampling Methods 0.000 claims abstract description 178
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000000691 measurement method Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 173
- 239000003570 air Substances 0.000 description 33
- 241000883990 Flabellum Species 0.000 description 13
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000008676 import Effects 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000000748 cardiovascular system Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 230000009323 psychological health Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- 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
- G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
Abstract
The application relates to an air carbon monoxide measurement method, and belongs to the technical field of environmental monitoring. Which comprises the following steps: 1) Collecting sample gas; 1.1 Sample gas collection is carried out on different heights of the sampling points to form standard sample gas of one sampling point; 1.2 Step 1.1), sample gas collection is carried out on each sampling point according to the step; 2) Zeroing; 3) Calibrating; 4) Analyzing a sample gas; 4.1 Connecting the sample gas to an air inlet of a carbon monoxide infrared analyzer; 4.2 Starting an internal pump to continuously suck the sample gas; 4.3 Reading the value; 4.4 Closing the internal pump; 4.5 Repeating the steps 4.1) to 4.4), and completing the measurement of the carbon monoxide in each sampling sample application gas. The application has the effect that the collected sample gas is closer to the real environment condition.
Description
Technical Field
The application relates to the field of environmental monitoring, in particular to an air carbon monoxide measuring method and an air carbon monoxide measuring instrument.
Background
Research and practice at home and abroad prove that carbon monoxide is a harmful gas which damages blood and nerves. The carbon monoxide with low concentration can produce strong toxic action on the cardiovascular system and nervous system of human body after long-term contact. The existence of carbon monoxide with variable concentration in the ambient air can influence the air quality of the atmospheric environment, so that the monitoring of the carbon monoxide concentration content in the ambient air is a necessary technical means for ensuring the physical and psychological health of a human body and controlling the environmental pollution.
The current method for measuring carbon monoxide in the environment mainly comprises an infrared absorption spectrum method, a potentiostatic electrolytic method, a mercury displacement method, a gas chromatography method and the like, wherein the infrared absorption spectrum method is a technology which is advanced nowadays and has high anti-interference capability. At present, the carbon monoxide detector in the ambient air is mainly measured based on an infrared absorption spectrometry, and the existing measurement mode adopting an infrared analyzer for measurement generally comprises the steps of preheating, zeroing, calibrating and measuring, wherein during measurement, sample gas can be subjected to inspiration measurement at each measurement point on site through the instrument, and also can be subjected to measurement in a laboratory through collecting corresponding sample gas.
With respect to the above-mentioned related art, the inventors consider that the concentration of carbon monoxide in the environment may be affected by the walking of the collector and the respiration of the collector when collecting the sample gas.
Disclosure of Invention
In a first aspect, the present application provides an air carbon monoxide measurement method in order to reduce the influence on the carbon monoxide concentration during collection.
The application provides an air carbon monoxide measuring method which adopts the following technical scheme:
an air carbon monoxide measurement method, the method comprising the steps of:
1) Collecting sample gas;
1.1 Sample gas collection is carried out on different heights of the sampling points, and the collected sample gas is mixed to form standard sample gas of one sampling point;
1.2 Step 1.1), sample gas collection is carried out on each sampling point according to the step;
Measuring carbon monoxide in the sample gas by using a carbon monoxide infrared analyzer;
2) Zeroing;
3) Calibrating;
4) Analyzing a sample gas;
4.1 Connecting the sample gas to an air inlet of a carbon monoxide infrared analyzer;
4.2 Starting an internal pump of the carbon monoxide infrared analyzer, and continuously sucking the sample gas;
4.3 Directly reading the numerical value after the number to be read is stable;
4.4 Closing an internal pump of the carbon monoxide infrared analyzer;
4.5 Repeating steps 4.1), 4.2), 4.3) and 4.4), and completing the measurement of carbon monoxide in each sample application gas.
Through adopting above-mentioned technical scheme, through gathering the sample gas of sampling point not co-altitude, then mix the sample gas of not co-altitude collection, mix the standard sample gas that forms a sampling point, through such a mode, a test can collect the condition that the sample gas of a plurality of altitudes of sampling point contains carbon monoxide, obtain a comparatively accurate data, when reducing the collection sample gas, personnel walk and breathe the influence to carbon monoxide concentration, the degree of accuracy of data is higher, the sample gas of gathering carries out analysis measurement carbon monoxide's concentration through the infrared analysis appearance of carbon monoxide.
Optionally, in step 1.1), sample gas is collected at different heights of the sampling points in different directions, and no collection is performed on the side facing the collection personnel.
Through adopting above-mentioned technical scheme, when gathering the sample gas of the not co-altitude of sampling point, gather the sample gas of same high different directions for when gathering the sample gas, all gather the mixture to the sample gas of sampling point each direction, thereby gather the mixture to the sample gas of sampling point all around, advance and perhaps improve the accuracy of measuring data, reduce the interference.
Optionally, in step 3), the discharged calibration gas is treated at the gas outlet of the carbon monoxide infrared analyzer, so that the calibration gas is not directly discharged indoors.
By adopting the technical scheme, because the calibration gas contains higher carbon monoxide concentration, carbon monoxide can be combusted, and the detected calibration gas is not directly discharged indoors, so that the possibility of danger is reduced, and the safety of test personnel is ensured.
In a second aspect, in order to facilitate sampling, the present application provides an air carbon monoxide measuring instrument, which adopts the following technical scheme:
The utility model provides an air carbon monoxide measuring instrument, includes sample thief and gas collecting bag, the sample thief includes sampling shell, piston and drives the pole, the sampling shell is provided with the sampling chamber, the piston slide install in the sampling intracavity, it is fixed in to drive the pole the piston, be provided with a plurality of sampling holes on the sampling shell, the sampling hole intercommunication sampling chamber and be provided with the check valve that feeds into the sampling chamber from outside, the sampling shell all is provided with a plurality of sampling holes at different altitudes, the sampling hole of the same altitude the sampling hole distributes on the lateral wall of the different orientation of sampling shell and towards different directions, the sampling shell bottom is provided with the intercommunication the outlet duct in sampling chamber, just be provided with the check valve that supplies the sample gas output of sampling intracavity on the outlet duct, the gas collecting bag is used for receiving the exhaust sample gas of outlet duct.
Through adopting above-mentioned technical scheme, sample gas to sampling point different height and direction is gathered and mixed through the sample thief, the sample gas of mixing is input and is collected by the gas collecting bag, when sampling gas, drive the piston through the drive pole and slide in sampling cavity and produce vacuum environment, under the effect of atmospheric pressure, sample gas gets into sampling cavity from the sampling hole of different height and direction, and mix in sampling cavity, sampling process is simple and convenient, it can gather the sample gas of each height and direction to drive the piston through the drive pole, the outlet duct that sets up is used for discharging the sample gas after mixing, send into the gas collecting bag through the outlet duct and preserve and be used for the test at the back, set up the check valve on sampling hole and the outlet duct, thereby control the flow direction of sample gas, get into sampling cavity from the sampling hole, discharge from the outlet duct.
Optionally, the sampling hole includes import and export, the import set up in sampling shell lateral wall, the export set up in the chamber bottom of sampling chamber, the import is followed sampling chamber outward appearance extends to the export forms the sampling hole, and a plurality of the extension length of sampling hole is unanimous.
Through adopting above-mentioned technical scheme for the export of a plurality of sampling holes all is located the bottom of sampling chamber, and the import of a plurality of sampling holes distributes and carries out the absorption of sample gas in each position of sampling shell, such setting mode makes the length that the sampling hole extends keep unanimous, the distance that sample gas got into the sampling chamber and need flow keeps unanimous, and the export all sets up in the bottom of sampling chamber, when making the piston remove, the export of a plurality of sampling holes all is in vacuum environment, a plurality of sampling holes carry out sampling process simultaneously, the sample tolerance that makes each sampling hole gather is basically unanimous, the carbon monoxide content of the representation sampling point that mixes of sample gas after being fine is difficult to appear the circumstances that the intake of a certain altitude certain direction is partial.
Optionally, the piston is towards the lateral wall in sampling chamber has seted up the installation cavity, install the flabellum in the installation cavity and drive the drive assembly of flabellum pivoted.
Through adopting above-mentioned technical scheme, through the rotation of drive assembly drive flabellum, through the rotatory sampling intracavity absorptive sample gas of stirring of flabellum for the sample gas of different height and direction is mixed more evenly in the sampling intracavity after inhaling, and the content of carbon monoxide in the sampling point air can be reflected more to the standard sample gas of output.
Optionally, the driving assembly comprises a collecting tube, one end of the collecting tube penetrates through the piston and is communicated with the upper portion of the mounting cavity, and a one-way valve which is used for feeding air into the mounting cavity from the outside is arranged at the other end of the collecting tube.
Through adopting above-mentioned technical scheme, through setting up the collection pipe, on the one hand, gather the sample gas of sample thief top, on the other hand, the sample gas that gathers through the collection pipe first of all installs the chamber and blows and drive the flabellum rotation, breaks up the inhaled sample gas through the rotation of flabellum, drives the sample gas and mixes in the intracavity motion of sampling.
Optionally, the drive assembly still includes rack, gear, first pivot, second pivot, first bevel gear and second bevel gear, installation cavity part extends and offers into in the drive pole, rack one end is fixed in the chamber bottom of sampling chamber, the rack other end overhang set up in the installation cavity, first pivot rotate install in the installation cavity, first bevel gear install in first pivot, the second pivot rotate install in the installation cavity, the gear install in the second pivot and with the rack meshing, the flabellum has two, one the flabellum suit in first pivot, another the flabellum is fixed in first pivot, the second bevel gear install in the second pivot and with first bevel gear meshing.
Through adopting above-mentioned technical scheme, through rack drive gear rotation, the gear drives the second pivot rotation, the second pivot drives the second bevel gear rotation, the second bevel gear drives first bevel gear rotation, first bevel gear drives first pivot rotation, first pivot drives the flabellum rotation, drive assembly's synchronous operation when realizing the sampling, the removal of piston drives the rotation of flabellum, combine sampling and two steps of mixing, an action realizes two processes, when discharging the sample gas simultaneously, stirring process also can continue.
Optionally, install the rubber hose on the outlet duct, install the stagnant water clamp on the rubber hose, the gas collecting bag is provided with the sample gas intake pipe, the sample gas intake pipe is provided with the check valve.
Through adopting above-mentioned technical scheme, through rubber hose and stagnant water clamp cooperation for rubber hose can press from both sides tightly through the stagnant water and seal, reduces the air and gets into rubber hose, when needs are from the sampling chamber collection standard sample gas, through rubber hose and sample gas intake pipe cartridge fixed, open the stagnant water and press from both sides, inject into sample gas in the gas collecting bag, pollution abatement.
Optionally, the gas collecting bag is provided with a sample gas outlet pipe, and the sample gas outlet pipe is provided with a one-way valve.
Through adopting above-mentioned technical scheme, set up the sample gas outlet duct for discharge sample gas, on the one hand, be used for wasing the gas collecting bag, on the other hand for during the test, to instrument input sample gas, earlier with rubber hose and sample gas intake pipe cartridge intercommunication, open the stagnant water clamp, squeeze into sample gas, close the stagnant water clamp, squeeze out sample gas, rinse repeatedly, squeeze into sample gas at last and remain.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through collecting the sample gases with different heights of the sampling point, then mixing the sample gases collected with different heights to form a standard sample gas with one sampling point, in such a way, the condition that the sample gases with the plurality of heights of the sampling point contain carbon monoxide can be collected by one test to obtain more accurate data, the influence of personnel walking and breathing on the concentration of the carbon monoxide when the sample gases are collected is reduced, the accuracy of the detection data is higher, and the collected sample gas is analyzed and measured through a carbon monoxide infrared analyzer;
2. the sampling device comprises a sampling device, a sampling cavity, a sampling hole and a gas outlet pipe, wherein the sampling device is used for collecting the sample gas at different heights and directions of the sampling point, the mixed sample gas is input into the sampling bag through the sampling device, when the sample gas is sampled, a driving rod drives a piston to slide in the sampling cavity to generate a vacuum environment, under the action of atmospheric pressure, the sample gas enters the sampling cavity from the sampling hole at different heights and directions and is mixed in the sampling cavity, the sampling process is simple and convenient, the driving rod drives the piston to move to collect the sample gas at each height and direction, the arranged gas outlet pipe is used for discharging the mixed sample gas, the mixed sample gas is sent into the sampling bag through the gas outlet pipe to be stored for later testing, and the sampling hole and the gas outlet pipe are provided with one-way valves, so that the flowing direction of the sample gas is controlled, and the sample gas enters the sampling cavity from the sampling hole and is discharged from the gas outlet pipe;
3. Through the rotation of drive assembly drive flabellum, through the rotatory sample gas of stirring sampling intracavity of flabellum for the sample gas of different height and direction is mixed more evenly in the sampling intracavity after the suction, and the content of carbon monoxide in the sampling point air can be reflected more to the standard sample gas of output.
Drawings
FIG. 1 is a schematic diagram of the structure of a sampler and a gas bag;
FIG. 2 is a schematic diagram of the structure of the carbon monoxide infrared analyzer, calibration gas tank and exhaust gas treatment device;
FIG. 3 is a schematic diagram of a sampler in partial cutaway;
FIG. 4 is a schematic diagram of the structure of the sampler;
FIG. 5 is a schematic view of the structure of the air collection bag;
fig. 6 is a schematic structural diagram of a carbon monoxide infrared analyzer.
Reference numerals illustrate: 1. a sampler; 2. a sampling shell; 21. a piston; 211. a mounting cavity; 22. a drive rod; 23. supporting feet; 24. braking casters; 25. a sampling cavity; 26. a sampling hole; 261. an inlet; 262. an outlet; 27. an air outlet pipe; 28. a rubber hose; 3. a sampling tube; 4. a fan blade; 51. a collection tube; 52. a rack; 53. a gear; 54. a first rotating shaft; 55. a second rotating shaft; 56. a first bevel gear; 57. a second bevel gear; 58. a snap ring is connected quickly; 6. a gas collection bag; 61. a sample gas inlet pipe; 62. a sample gas outlet pipe; 7. a carbon monoxide infrared analyzer; 71. a power interface; 72. a power switch; 73. a pump switch; 74. the battery is externally connected with a change-over switch; 75. an end point potentiometer; 76. a zero potentiometer; 77. battery voltage checking and instrument measuring change-over switch; 781. a sample gas inlet; 782. a sample gas outlet; 79. zeroing and measuring a six-way valve; 8. calibrating a gas tank; 9. an exhaust gas treatment device; 91. a housing; 92. an exhaust pipe; 93. an air inlet pipe; 94. an exhaust pipe; 95. a glass viewing aperture; 96. a small air pump.
Detailed Description
The application is described in further detail below with reference to fig. 1-6.
The embodiment of the application discloses an air carbon monoxide measuring instrument. Referring to fig. 1 and 2, an air carbon monoxide measuring instrument comprises a sampler 1 for collecting a sample gas, a gas collection bag 6 for temporarily storing the sample gas, a carbon monoxide infrared analyzer 7 for detecting the concentration of carbon monoxide in the sample gas, a calibration gas tank 8 for calibrating the carbon monoxide infrared analyzer 7, and an exhaust gas treatment device 9 for treating a calibration gas with a higher concentration of carbon monoxide.
Referring to fig. 1 and 3, the sampler 1 includes a sampling housing 2, a piston 21, a driving rod 22, a sampling tube 3, a fan blade 4 and a driving assembly for driving the fan blade 4 to rotate, supporting feet 23 are respectively arranged at four corners of the lower part of the sampling housing 2, and brake casters 24 are arranged under the supporting feet 23, so that the sampler 1 can be conveniently carried and fixed in place.
Referring to fig. 1 and 3, a sampling cavity 25 with an opening at the upper part is arranged on a sampling shell 2, a piston 21 is slidably arranged in the sampling cavity 25, and the piston 21 is attached to the cavity wall of the sampling cavity 25, so that when the piston 21 slides in the sampling cavity 25, the sampling cavity 25 and the piston 21 are kept in a sealing state, a sealing rubber layer is sleeved outside the piston 21 and is adhered and fixed, and a driving rod 22 is vertically and integrally fixed in the middle of the piston 21.
Referring to fig. 1 and 4, a plurality of sampling holes 26 are provided on the sampling case 2, each sampling hole 26 includes an inlet 261 and an outlet 262, the plurality of inlets 261 are provided at different positions of the side wall of the sampling case 2, in this embodiment, the sampling case 2 includes four horizontally oriented side walls, wherein three side walls are provided with the inlets 261 of the sampling holes 26, each side wall is provided with three inlets 261, the three inlets 261 of each side wall are provided at intervals along the width direction of the side wall, the three inlets 261 of the same side wall are provided at intervals along the height direction of the side wall, so that the three inlets 261 of the same side wall are located at different heights, the outlet 262 of each sampling hole 26 is provided at the bottom of the sampling case 2, the outlet 262 of the sampling hole 26 penetrates the bottom of the sampling cavity 25, the sampling holes 26 are provided from the inlet 261 to the outlet 262 along the outer wall of the sampling case 2, the sampling holes 26 are provided to extend downwards first and then extend horizontally, and simultaneously the lengths of all the sampling holes 26 remain consistent, and the inlets 261 of the same side wall are located at the positions of the middle of the sampling case 2, which is closer to the bottom of the sampling case 2 than the outlet 262 of the outlet 262 located at the higher position of the sampling case 2.
Referring to fig. 3 and 4, a sampling tube 3 is installed in each sampling hole 26, the cross section of the portion of the sampling hole 26 between the inlet 261 and the outlet 262 is a major arc, so that the sampling tube 3 is fixed in the sampling hole 26 in a fitting manner and is not easy to fall off, one end of the sampling tube 3 enters the sampling cavity 25 through the outlet 262 of the sampling hole 26, the other end of the sampling tube 3 is provided with an air check valve, and the sampling tube 3 can be input into the sampling cavity 25 from the outside through the air check valve, and the air sample in the sampling cavity 25 cannot flow out through the sampling tube 3.
Referring to fig. 3 and 5, the bottom of the sampling case 2 is provided with an air outlet pipe 27 communicated with the sampling cavity 25, the air outlet pipe 27 is provided with a one-way valve, the sample gas is controlled to be discharged out of the sampling cavity 25 through the air outlet pipe 27 by the one-way valve, a rubber hose 28 is arranged on the air outlet pipe 27, and a water stop clamp is arranged on the rubber hose 28.
Referring to fig. 3, a mounting cavity 211 for mounting the fan blade 4 and the driving component is formed in the side wall of the piston 21 facing the sampling cavity 25, the mounting cavity 211 also extends into the driving rod 22, the mounting cavity 211 is a stepped hole and is coaxial with the driving rod 22, and a larger diameter part of the mounting cavity 211 is located at the piston 21.
Referring to fig. 3, the driving assembly includes a collecting tube 51, a rack 52, a gear 53, a first rotating shaft 54, a second rotating shaft 55, a first bevel gear 56 and a second bevel gear 57, wherein the first rotating shaft 54 is vertically arranged, the upper end of the first rotating shaft is rotatably installed at the bottom of the installation cavity 211, two fan blades 4 are arranged on the first rotating shaft 54 at intervals, the fan blades 4 positioned on the upper side are sleeved on the first rotating shaft 54 and can rotate around the first rotating shaft 54, and the fan blades 4 positioned on the lower side are fixedly connected with the first rotating shaft 54 and move together with the first rotating shaft 54.
Referring to fig. 3, two quick-connection snap rings 58 are arranged at the top of the driving rod 22, two collecting pipes 51 are arranged, one ends of the two collecting pipes 51 penetrate through the mounting cavity 211 in the driving rod 22 and are located above the fan blades 4, the other ends of the collecting pipes 51 are correspondingly clamped on the quick-connection snap rings 58 one by one, the axis of one end of each collecting pipe 51 located in the mounting cavity 211 is not intersected with the axis of the driving rod 22, the sample gas input by each collecting pipe 51 is beaten on the fan blade 4 located on the upper side, so that the fan blade 4 located on the upper side is driven to rotate, a one-way valve is also arranged on each collecting pipe 51, the sample gas can only be input into the sampling cavity 25 by the collecting pipes 51, the length of each collecting pipe 51 is consistent with that of the corresponding collecting pipe 3, and the sample gas above the sampling pipe 1 is collected.
Referring to fig. 3, one end of the rack 52 is fixed to the bottom of the sampling chamber 25, the other end of the rack 52 is vertically suspended, when the piston 21 is located at the bottom of the sampling chamber 25, the rack 52 is extended into the mounting chamber 211, the second rotating shaft 55 is mounted in the mounting chamber 211 in the piston 21, the second rotating shaft 55 is located below the first rotating shaft 54, the axis of the second rotating shaft 55 is perpendicular to the axis of the first rotating shaft 54 and intersects with the rubber, two ends of the second rotating shaft 55 are mounted on the wall of the mounting chamber 211 in the piston 21, so that the second rotating shaft 55 can rotate, the gear 53 and the second bevel gear 57 are mounted at two ends of the second rotating shaft 55, the rack 52 is meshed with the gear 53, the first bevel gear 56 is mounted on one end of the first rotating shaft 54 in the piston 21, and the second bevel gear 57 is meshed with the first bevel gear 56.
Referring to fig. 1 and 5, the gas collecting bag 6 is configured to receive the sample gas discharged from the gas outlet pipe 27, the gas collecting bag 6 is provided with a sample gas inlet pipe 61 and a sample gas outlet pipe 62, and check valves are provided on the sample gas inlet pipe 61 and the sample gas outlet pipe 62, so that gas can enter the gas collecting bag 6 through the sample gas inlet pipe 61 but cannot be discharged through the sample gas inlet pipe 61, and the check valve on the sample gas outlet pipe 62 allows gas to exit the gas collecting bag 6 through the sample gas inlet pipe 61 but cannot enter the gas collecting bag 6 through the sample gas outlet pipe 62.
The check valves on the air collection bag 6 and the sampler 1 are both gas check valves.
Referring to fig. 6, the carbon monoxide infrared analyzer 7 may be a GXH-3011A type portable infrared gas analyzer, which is provided with a power interface 71, a power switch 72, a pump switch 73, a battery external switch 74, an end point potentiometer 75, a zero point potentiometer 76, a battery voltage checking and instrument measuring switch 77, a sample gas inlet 781, a zeroing measurement six-way valve 79 and a sample gas outlet 782, and the carbon monoxide infrared analyzer 7 is internally provided with an internal pump for sucking gas and a hopcalite tube for zeroing.
Referring to fig. 2 and 6, the exhaust gas treatment device 9 includes a housing 91, an exhaust pipe 92, an air inlet pipe 93 and an exhaust pipe 94, one end of the exhaust pipe 92 is communicated with the inner space of the housing 91, the other end is fixedly inserted into a sample gas outlet 782 of the carbon monoxide infrared analyzer 7, so that a calibration gas containing carbon monoxide with higher concentration discharged during calibration enters the housing 91 through the exhaust pipe 92, a combustion source is arranged inside the housing 91 to burn carbon monoxide in the calibration gas, a switch of the combustion source is arranged outside the housing 91, a glass observation hole 95 is arranged on the housing 91 and is provided with transparent glass, the air inlet pipe 93 is communicated with the interior of the housing 91 and is provided with a small air pump 96 to input air for diluting the burned calibration gas, one end of the exhaust pipe 94 is communicated with the interior of the housing 91, the other end is communicated with the outside, and the burned and diluted calibration gas is discharged, so that pollution is reduced, and a tester is not easy to inhale a large amount of carbon monoxide to cause danger.
The embodiment of the application also discloses a method for measuring the carbon monoxide in the air, which comprises the following steps:
1) Collecting sample gas;
1.1 Sample gas collection is carried out on different heights of the sampling points, and the collected sample gas is mixed to form standard sample gas of one sampling point;
during collection, the piston 21 is driven to move by the driving rod 22, sample gas is absorbed from the outside of the sampler 1 through the sampling tube 3 and the sampling tube 51 and enters the sampling cavity 25, mixing of the sample gas is completed in the process, then the rubber hose 28 is connected with the sample gas inlet tube 61 in an inserting way, the water stop clamp is opened, the piston 21 is moved downwards to squeeze the sample gas into the sample gas bag 6, the water stop clamp is closed, the sample gas is squeezed out of the sample gas bag 6, the sample gas is repeatedly cleaned for three times, and finally the sample gas is squeezed into the sample gas for storage.
1.2 Step 1.1), sample gas collection is carried out on each sampling point according to the step;
Using a carbon monoxide infrared analyzer 7 to measure carbon monoxide in the sample gas;
2) Zeroing: the carbon monoxide infrared analyzer 7 is started, the power supply is switched on and preheated for 30 minutes, a built-in Hogaret tube of the instrument is adopted for zeroing, a pump switch 73 is turned on to start a built-in pump, a zeroing measurement six-way valve 79 is rotated to a zeroing gear, a battery voltage checking and instrument measurement change-over switch 77 is turned to a measuring gear, zeroing operation is carried out through a zero potentiometer 76, and the instrument display value is adjusted to zero;
3) Calibrating: the zeroing measurement six-way valve 79 rotates to a measurement gear, carbon monoxide calibration gas with the flow of 0.5L/min is introduced into a sample gas inlet 781 of the carbon monoxide infrared analyzer 7 through a calibration gas tank 8, an instrument end point potentiometer 75 is adjusted, the measured carbon monoxide concentration is positioned at a corresponding position of the carbon monoxide calibration gas concentration, and during calibration, a sample gas outlet 782 of the carbon monoxide infrared analyzer 7 is fixedly inserted into an exhaust pipe 92 to process the calibration gas;
4) Analyzing a sample gas;
4.1 Connecting the sample gas to the gas inlet of the carbon monoxide infrared analyzer 7;
4.2 Starting an internal pump of the carbon monoxide infrared analyzer 7, and continuously sucking the sample gas;
4.3 Directly reading the numerical value after the number to be read is stable;
4.4 A built-in pump of the carbon monoxide infrared analyzer 7 is turned off;
4.5 Repeating steps 4.1), 4.2), 4.3) and 4.4), and completing the measurement of carbon monoxide in each sample application gas.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (6)
1. An air carbon monoxide measuring instrument, characterized in that: the sampler comprises a sampler (1) and a gas collection bag (6), wherein the sampler (1) comprises a sampling shell (2), a piston (21) and a driving rod (22), the sampling shell (2) is provided with a sampling cavity (25), the piston (21) is slidably arranged in the sampling cavity (25), the driving rod (22) is fixed on the piston (21), a plurality of sampling holes (26) are formed in the sampling shell (2), the sampling holes (26) are communicated with the sampling cavity (25) and are provided with one-way valves for feeding gas into the sampling cavity (25) from the outside, the sampling shell (2) is provided with a plurality of sampling holes (26) at different heights, the sampling holes (26) at the same height of the sampling shell (2) are distributed on side walls of the sampling shell (2) in different directions, the bottom of the sampling shell (2) is provided with a plurality of gas collection holes (27) communicated with the sampling cavity (25), and the gas collection bag (27) is provided with a gas collection pipe (6) for discharging the gas from the sampling cavity (25);
the sampling hole (26) comprises an inlet (261) and an outlet (262), the inlet (261) is arranged on the side wall of the sampling shell (2), the outlet (262) is arranged at the bottom of the sampling cavity (25), the inlet (261) extends to the outlet (262) along the outer surface of the sampling cavity (25) to form the sampling hole (26), and the extending lengths of the plurality of sampling holes (26) are consistent;
a mounting cavity (211) is formed in the side wall, facing the sampling cavity (25), of the piston (21), and a fan blade (4) and a driving component for driving the fan blade (4) to rotate are mounted in the mounting cavity (211);
the driving assembly comprises a collecting tube (51), one end of the collecting tube (51) penetrates through the piston (21) and is communicated with the upper part of the mounting cavity (211), and a one-way valve which feeds air into the mounting cavity (211) from the outside is arranged at the other end of the collecting tube (51);
The driving assembly further comprises a rack (52), a gear (53), a first rotating shaft (54), a second rotating shaft (55), a first bevel gear (56) and a second bevel gear (57), wherein the installation cavity (211) is partially extended and arranged in the driving rod (22), one end of the rack (52) is fixed in the cavity bottom of the sampling cavity (25), the other end of the rack (52) is suspended in the installation cavity (211), the first rotating shaft (54) is rotatably installed in the installation cavity (211), the second rotating shaft (55) is positioned below the first rotating shaft (54), the axis of the second rotating shaft (55) is perpendicular to and intersected with the axis of the first rotating shaft (54), the first bevel gear (56) is installed in the first rotating shaft (54), the second rotating shaft (55) is rotatably installed in the installation cavity (211), the gear (53) is installed in the second rotating shaft (55) and meshed with the rack (52), the two fan blades (4) are rotatably sleeved on the first rotating shaft (54) at intervals, the fan blade (4) positioned at the lower side is fixedly connected with the first rotating shaft (54) and moves along with the first rotating shaft (54), and the second bevel gear (57) is installed on the second rotating shaft (55) and meshed with the first bevel gear (56).
2. An air carbon monoxide measuring instrument according to claim 1, wherein: the air outlet pipe (27) is provided with a rubber hose (28), the rubber hose (28) is provided with a water stop clamp, the air collecting bag (6) is provided with a sample air inlet pipe (61), and the sample air inlet pipe (61) is provided with a one-way valve.
3. An air carbon monoxide measuring instrument according to claim 2, wherein: the gas collecting bag (6) is provided with a sample gas outlet pipe (62), and the sample gas outlet pipe (62) is provided with a one-way valve.
4. A method of measuring an air carbon monoxide measuring instrument as claimed in claim 1, wherein the method comprises the steps of:
1) Collecting sample gas;
1.1 Sample gas collection is carried out on different heights of the sampling points, and the collected sample gas is mixed to form standard sample gas of one sampling point;
1.2 Step 1.1), sample gas collection is carried out on each sampling point according to the step;
Measuring carbon monoxide in the sample gas by using a carbon monoxide infrared analyzer;
2) Zeroing;
3) Calibrating;
4) Analyzing a sample gas;
4.1 Connecting the sample gas to an air inlet of a carbon monoxide infrared analyzer;
4.2 Starting an internal pump of the carbon monoxide infrared analyzer, and continuously sucking the sample gas;
4.3 Directly reading the numerical value after the number to be read is stable;
4.4 Closing an internal pump of the carbon monoxide infrared analyzer;
4.5 Repeating steps 4.1), 4.2), 4.3) and 4.4), and completing the measurement of carbon monoxide in each sample application gas.
5. The measurement method according to claim 4, wherein: in the step 1.1), sample gas is collected at different heights of the sampling points in different directions, and the surface facing the collection personnel is not collected.
6. The measurement method according to claim 5, wherein: in the step 3), the discharged calibration gas is treated at the gas outlet of the carbon monoxide infrared analyzer, so that the calibration gas is not directly discharged indoors.
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