CN110596310A - Exhaled gas analyzer and operation method - Google Patents
Exhaled gas analyzer and operation method Download PDFInfo
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- CN110596310A CN110596310A CN201910717768.3A CN201910717768A CN110596310A CN 110596310 A CN110596310 A CN 110596310A CN 201910717768 A CN201910717768 A CN 201910717768A CN 110596310 A CN110596310 A CN 110596310A
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- 238000000034 method Methods 0.000 title claims description 40
- 239000007789 gas Substances 0.000 claims abstract description 377
- 238000001514 detection method Methods 0.000 claims abstract description 106
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 72
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 66
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000001257 hydrogen Substances 0.000 claims abstract description 35
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 35
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 33
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 33
- 238000005086 pumping Methods 0.000 claims description 21
- 238000011010 flushing procedure Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004868 gas analysis Methods 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012864 cross contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000241 respiratory 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/005—H2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention provides an exhaled gas analyzer which comprises a gas inlet end, a sample gas detection bypass, a sample gas detection trunk, a plurality of gas guide pipes, a gas outlet end and a gas extraction pump, wherein the sample gas detection bypass comprises a first gas inlet valve, a methane detector, a first pressure sensor, a first gas outlet valve and a second gas outlet valve, the first gas inlet valve, the methane detector and the first pressure sensor are sequentially connected through the gas guide pipes, the first pressure sensor is respectively connected with one end of the first gas outlet valve and one end of the second gas outlet valve, the sample gas detection trunk comprises a second gas inlet valve, a carbon dioxide detector, a hydrogen detector, a second pressure sensor and a third gas outlet valve, and the second gas inlet valve, the carbon dioxide detector, the hydrogen detector, the second pressure sensor and the third gas outlet valve are sequentially connected with one another through the gas guide pipes. The exhaled gas analyzer provided by the invention has the advantages that the accuracy of sample gas detection is improved, the detection time is shortened, and the working efficiency of the exhaled gas analyzer is improved.
Description
Technical Field
The invention relates to the field of gas analyzers, in particular to an expired gas analyzer and an operation method.
Background
The existing exhaled gas analyzer products have high working air pressure of a hydrogen detector and a carbon dioxide detector, and the air pressure in a pipeline in which the hydrogen detector and the nitrogen dioxide detector are installed in the traditional exhaled gas analyzer cannot be too low, so that the system pressure of the whole exhaled gas analyzer is at a high level. When gas detection is started, the gas pressure difference between the sample gas bag and the traditional gas analyzer is small, so that the amount of the sample gas sent into the system is limited, and after the sample gas is mixed with the air in the gas analyzer, the sample gas can be diluted more, so that the final testing precision is influenced.
When a traditional exhaled gas analyzer detects sample gas, a pipeline with only one channel is arranged from gas inlet to gas outlet, and when the sample gas analyzer detects the sample gas, gas inlet and gas outlet valves are closed; the sample gas and the air in the exhaled gas analyzer are fully mixed for a long time, so that the existing exhaled gas analyzer only has a single channel, more time is consumed for detection, the reaction rate of the exhaled gas analyzer is slow, the working efficiency is low, and the detection result is inaccurate.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide an exhaled gas analyzer, which can solve the problems that the existing exhaled gas analyzer only has a single channel, so that the detection consumes more time, the reaction rate of the exhaled gas analyzer is slow, the working efficiency is low, and the detection result is inaccurate.
The invention also aims to provide an operation method of the exhaled gas analyzer, which can solve the problems that the existing exhaled gas analyzer only has a single channel, so that more time is consumed for detection, the exhaled gas analyzer has a slow reaction rate, low working efficiency and inaccurate detection result.
One of the purposes provided by the invention is realized by adopting the following technical scheme:
the utility model provides an expired gas analyzer, includes inlet end, sample gas detection bypass, sample gas detection trunk, a plurality of gas conduit, the end and the aspiration pump of giving vent to anger, sample gas detection bypass includes first admission valve, methane detector, first pressure sensor, first air outlet valve and second air outlet valve, first admission valve, the methane detector loop through between the first pressure sensor gas conduit connection, first pressure sensor respectively with first air outlet valve and the one end of second air outlet valve is connected, sample gas detection trunk includes second admission valve, carbon dioxide detector, hydrogen detector, second pressure sensor and third air outlet valve, the second admission valve the carbon dioxide detector the hydrogen detector second pressure sensor and the third air outlet valve loops through gas conduit interconnect, the first air inlet valve, the second air inlet valve and the air inlet end are connected through the gas guide pipe, one end of the air pump, the first air outlet valve and the third air outlet valve are connected through the gas guide pipe, and the other end of the air pump, the second air outlet valve and the air outlet end are connected through the gas guide pipe.
Further, the air inlet end includes air inlet, third air inlet valve and filter core, the air inlet, third air inlet valve and the filter core loops through the gas conduit connects, and the sample gas follows the air inlet gets into, process third air inlet valve extremely the filter core, the moisture in the sample gas is filtered to the filter core.
Further, the filter element is located between the second air inlet valve and the third air inlet valve.
Furthermore, the air outlet end comprises a fourth air outlet valve and an air outlet, one end of the fourth air outlet valve is connected with the air outlet through the air conduit, and the other end of the fourth air outlet valve is connected with the air pump through the air conduit.
The second purpose of the invention is realized by adopting the following technical scheme:
a method of operating an exhaled gas analyzer, the method of operation being applicable to the exhaled gas analyzer of the present application, comprising the steps of:
performing chamber flushing treatment, closing the second air outlet valve, respectively opening the air inlet, the first air inlet valve, the second air inlet valve, the third air inlet valve, the first air outlet valve, the third air outlet valve, the fourth air outlet valve and the air outlet, starting the air pump, pumping air from the air inlet by the air pump, closing the third air inlet valve after air enters from the air inlet, pumping the gas in the sample gas detection bypass and the sample gas detection trunk to the air outlet by the air pump, and discharging residual sample gas in the exhaled gas analyzer;
the method comprises the steps of performing chamber depressurization treatment, closing a third air inlet valve and a second air outlet valve, opening a first air inlet valve, a second air inlet valve, a first air outlet valve, a third air outlet valve and a fourth air outlet valve, opening an air pump, pumping out gas in a sample gas detection bypass and a sample gas detection main road by the air pump, detecting the air pressure value in the sample gas detection bypass by a first pressure sensor, detecting the air pressure value in the sample gas detection main road by a second pressure sensor, and closing the air pump when the air pressure values in the sample gas detection bypass and the sample gas detection main road are detected to be within a preset air pressure range;
the method comprises the steps that sample gas is sucked, a sample gas bag containing the sample gas is inserted into a gas inlet, a suction pump is started, after the sample gas is sucked into the gas inlet, a third gas inlet valve, a first gas outlet valve and a fourth gas outlet valve are closed, a first gas inlet valve, a second gas outlet valve and a third gas outlet valve are opened, in the operation process of the suction pump, a sample gas detection bypass and a sample gas detection trunk form a circulation channel, the sample gas circularly flows in the circulation channel, and the sample gas is mixed with air in the circulation channel;
detecting a sample gas, wherein in the process of flowing the sample gas in the circulating channel, a carbon dioxide detector detects a carbon dioxide concentration value in the sample gas, a hydrogen detector detects a hydrogen concentration value in the sample gas, and a methane detector detects a methane concentration value in the sample gas;
correcting the detection value, namely correcting the hydrogen concentration value and the methane concentration value according to the carbon dioxide concentration value and the carbon dioxide concentration standard value to obtain a corrected hydrogen concentration value and a corrected methane concentration value;
and outputting a detection value, and outputting and displaying the corrected hydrogen concentration value and the corrected methane concentration value.
Further, the chamber rinsing process specifically includes:
performing inflation treatment, namely closing the second air outlet valve, respectively opening the air inlet, the first air inlet valve, the second air inlet valve, the third air inlet valve, the first air outlet valve, the third air outlet valve, the fourth air outlet valve and the air outlet, and starting an air pump, wherein the air pump pumps air into the air inlet;
and air pumping treatment, namely closing the third air inlet valve after air enters from the air inlet, and pumping the gas in the sample gas detection bypass and the sample gas detection trunk to the air outlet by using an air pump to discharge.
Further, after the times of the air pumping treatment and the air inflation treatment reach a preset pumping number, the step of chamber flushing treatment is finished.
Further, the chamber depressurization processing further comprises secondary depressurization processing, when the pressure values in the sample gas detection bypass and the sample gas detection trunk are detected within a preset pressure range, the first air inlet valve, the third air inlet valve, the second air inlet valve, the third air outlet valve and the second air outlet valve are closed, the first air outlet valve and the fourth air outlet valve are opened, the air pump is started, and the air pump is closed until the first pressure value detected by the first pressure sensor reaches the preset pressure value.
Further, when the secondary depressurization processing is finished, the pressure value detected by the first pressure sensor is smaller than the pressure value detected by the second pressure sensor.
Further, the preset air pressure value does not reach the preset air pressure range.
Compared with the prior art, the invention has the beneficial effects that: the utility model provides an expired gas analyzer, including the inlet end, sample gas detects the bypass, sample gas detects the trunk, a plurality of gas pipes, give vent to anger end and aspiration pump, sample gas detects the bypass and includes first admission valve, the methane detector, first pressure sensor, first air outlet valve and second air outlet valve, first admission valve, the methane detector, loop through gas conduit connection between the first pressure sensor, first pressure sensor is connected with the one end of first air outlet valve and second air outlet valve respectively, sample gas detects the trunk and includes second admission valve, the carbon dioxide detector, the hydrogen detector, second pressure sensor and third air outlet valve, second admission valve, the carbon dioxide detector, the hydrogen detector, second pressure sensor and third air outlet valve loop through gas conduit interconnect, pass through gas conduit connection between first admission valve, second admission valve and the inlet end three, one end of the air pump, the first air outlet valve and the third air outlet valve are connected through a gas conduit, and the other end of the air pump, the second air outlet valve and the air outlet end are connected through a gas conduit. The sample gas detection bypass is additionally arranged to fully suck the sample gas, after the sample gas is fully sucked, the sample gas detection trunk with the gas detector is opened, the internal circulation of the sample gas detection bypass and the sample gas detection trunk is realized, the sample gas is enabled to be fast and the air in the exhaled gas analyzer is fully mixed and then is detected, the accuracy of sample gas detection is improved, the detection time is shortened, and the working efficiency of the exhaled gas analyzer is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic diagram of an exhaled gas analyzer according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method of operating an exhaled breath analyzer according to an embodiment of the present invention;
FIG. 3 is a schematic view of the gas flow direction during a chamber rinse process in a method of operating an exhaled gas analyzer according to an embodiment of the present invention;
FIG. 4 is a schematic view of the gas flow direction during chamber depressurization processing in a method of operation of an exhaled gas analyzer according to an embodiment of the present invention;
FIG. 5 is a schematic view of the gas flow direction during a secondary depressurization process in a method of operation of an exhaled gas analyzer according to an embodiment of the present invention;
FIG. 6 is a schematic view of the gas flow direction for an unprocessed sample gas inhaled in an exhaled gas analyzer according to an embodiment of the present invention;
fig. 7 is a schematic view of the gas flow direction of the circulation channel in an exhaled breath analyzer according to an embodiment of the present invention.
In the figure: 00. an air inlet; 01. an air outlet; 10. a third air inlet valve; 11. a second intake valve; 12. a third gas outlet valve; 13. a first intake valve; 14. a first gas outlet valve; 15. a second gas outlet valve; 16. a fourth gas outlet valve; 20. a filter element; 30. a carbon dioxide detector; 31. a hydrogen detector; 32. a methane detector; 40. a second pressure sensor; 41. a first pressure sensor; 50. an air pump; 6. a gas conduit.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1, the exhaled gas analyzer of the present application includes an air inlet end, a sample gas detection bypass, a sample gas detection trunk, a plurality of gas conduits 6, an air outlet end, and an air pump 50, where the air inlet end includes an air inlet 00, a third air inlet valve 10, and a filter element 20, the air inlet 00, the third air inlet valve 10, and the filter element 20 are connected in sequence through the gas conduits 6, sample gas enters from the air inlet 00 and passes through the third air inlet valve 10 to the filter element 20, the filter element 20 filters moisture in the sample gas, and the filter element 20 is located between the second air inlet valve 11 and the third air inlet valve 10. The gas outlet end comprises a fourth gas outlet valve 16 and a gas outlet 01, one end of the fourth gas outlet valve 16 is connected with the gas outlet 01 through a gas conduit 6, and the other end of the fourth gas outlet valve 16 is connected with the air pump 50 through the gas conduit 6. The sample gas detection bypass comprises a first gas inlet valve 13, a methane detector 32, a first pressure sensor 41, a first gas outlet valve 14 and a second gas outlet valve 15, the first gas inlet valve 13, the methane detector 32 and the first pressure sensor 41 are sequentially connected through a gas conduit 6, the first pressure sensor 41 is respectively connected with one end of the first gas outlet valve 14 and one end of the second gas outlet valve 15, the sample gas detection main line comprises a second gas inlet valve 11, a carbon dioxide detector 30, a hydrogen detector 31, a second pressure sensor 40 and a third gas outlet valve 12, the second gas inlet valve 11, the carbon dioxide detector 30, the hydrogen detector 31, the second pressure sensor 40 and the third gas outlet valve 12 are sequentially connected through the gas conduit 6, the first gas inlet valve 13, the second gas inlet valve 11 and the gas inlet end are connected through the gas conduit 6, one end of the air pump 50, the first gas outlet valve 14 and the third gas outlet valve 12 are connected through the gas conduit 6, the other end of the air pump 50, the second air outlet valve 15 and the air outlet end are connected through the air conduit 6.
In this embodiment, the exhaled gas analyzer is controlled by a control panel, which includes three indicator lights and three keys. The three indicator lights respectively correspond to the three keys, and the indicator lights have red and green states; the three keys are respectively a power key, a standby key and a detection key. The pilot lamp that the power button corresponds is the power lamp, and is red scintillation when expired gas analysis appearance self-checking, and after the self-checking succeeds, the power lamp becomes green and often brightens, if the self-checking fails, the power lamp is red and often brightens. The red indicator light corresponding to the standby key represents the initial state, the green flashing is performed when the chamber is cleaned, the indicator light is green and normally on after the cleaning is successful, and the indicator light is recovered to red and normally on if the cleaning is failed. The initial state of the indicator lamp corresponding to the detection key is red and normally bright, the indicator lamp changes to green and flashes when gas detection is carried out, and when each gas detector finishes detection, the indicator lamp changes to green and normally bright. When all operations are completed, all the indicator lights are turned off. The exhaled gas analyzer in this embodiment further includes a control system, which is connected to the control panel, and the control system is electrically connected to the detectors, valves, and sensors in the air inlet, the sample gas detection bypass, the sample gas detection trunk, and the air outlet, and is electrically connected to the air pump 50.
As shown in fig. 2, in this embodiment, an operation method of an exhaled gas analyzer is further provided, where the operation method is applied to the exhaled gas analyzer described above, and specifically includes the following steps:
and (4) self-checking the equipment, connecting the exhaled gas analyzer to a mains supply, and starting self-checking, namely whether a self control program between control systems inside the exhaled gas analyzer makes mistakes or not. When the self-checking is started, the power lamp flashes red. Other indicator lights are all red and normally on. If the self-checking is successful, the power lamp is green and normally on, and the operation can be continued. If the self-checking fails, the power lamp is red and normally bright, the power lamp cannot be continuously operated downwards, and is restarted or to be overhauled, and the failure reason can be that the control program is started to make mistakes, and the like. And (5) carrying out the next step after the self-checking is successful.
And (3) performing chamber flushing treatment, closing the second air outlet valve 15, respectively opening the air inlet 00, the first air inlet valve 13, the second air inlet valve 11, the third air inlet valve 10, the first air outlet valve 14, the third air outlet valve 12, the fourth air outlet valve 16 and the air outlet 01, starting the air pump 50, pumping air from the air inlet 00 by the air pump 50, closing the third air inlet valve 10 after air enters from the air inlet 00, pumping air in the sample gas detection bypass and the sample gas detection main path out to the air outlet 01 by the air pump 50, and discharging residual sample gas in the exhaled gas analyzer. Specifically, the method comprises the following steps: the method comprises the following steps: performing inflation treatment, namely closing the second air outlet valve 15, respectively opening the air inlet 00, the first air inlet valve 13, the second air inlet valve 11, the third air inlet valve 10, the first air outlet valve 14, the third air outlet valve 12, the fourth air outlet valve 16 and the air outlet 01, starting the air pump 50, and pumping air into the air inlet 00 by the air pump 50; and (3) air extraction treatment, wherein after air enters from the air inlet 00, the third air inlet valve 10 is closed, and the air extraction pump 50 extracts the air in the sample gas detection bypass and the sample gas detection trunk to the air outlet 01 for discharge. In this embodiment, the evacuation process and the inflation process are performed cyclically until the chamber in the exhaled gas analyzer is clean; and after the times of the air pumping treatment and the air inflation treatment reach a preset pumping number of times, the step of chamber flushing treatment is finished. As the dotted line in fig. 3 indicates the flow direction of the sample gas, the air flows in from the air inlet end and then flows out in two paths: firstly, the gas flows through the first gas inlet valve 13, the methane detector 32, the first pressure sensor 41, the first gas outlet valve 14, the air pump 50, and finally passes through the fourth gas outlet valve 16 and is discharged from the gas outlet 01. Secondly, the gas flows through the second gas inlet valve 11, the carbon dioxide detector 30, the hydrogen detector 31, the second pressure sensor 40, the third gas outlet valve 12 and the air pump 50, and finally is discharged from the gas outlet 01 through the fourth gas outlet valve 16. The two flow directions are shown in the direction of the dotted line in fig. 3. The sample gas detection bypass and the sample gas detection trunk are respectively cleaned, so that residual gas in the prior detection of the exhaled gas analyzer can be uniformly taken out, and the purpose of cleaning the exhaled gas analyzer is never achieved.
And (3) performing chamber depressurization treatment, after the chamber flushing treatment step, closing the third air inlet valve 10 and the second air outlet valve 15, opening the first air inlet valve 13, the second air inlet valve 11, the first air outlet valve 14, the third air outlet valve 12 and the fourth air outlet valve 16, opening the air pump 50, pumping out gas in the sample gas detection bypass and the sample gas detection main line by the air pump 50, detecting a gas pressure value in the sample gas detection bypass by the first pressure sensor 41, detecting a gas pressure value in the sample gas detection main line by the second pressure sensor 40, and closing the air pump 50 when detecting that the gas pressure values in the sample gas detection bypass and the sample gas detection main line are within a preset gas pressure range. The above purpose is to reduce the air pressure in the sample gas detection bypass and the sample gas detection main line to the preset air pressure range, the specific air flow direction is shown in fig. 4, the air pump 50 works to pump out air in the exhaled gas analyzer, and the air flow direction is divided into three types: firstly, the gas flows through the first gas inlet valve 13, the methane detector 32, the first pressure sensor 41, the first gas outlet valve 14, the air pump 50, and finally passes through the fourth gas outlet valve 16 and is discharged from the gas outlet 01. Secondly, the gas flows through the second gas inlet valve 11, the carbon dioxide detector 30, the hydrogen detector 31, the second pressure sensor 40, the third gas outlet valve 12 and the air pump 50, and finally is discharged from the gas outlet 01 through the fourth gas outlet valve 16. The two flow directions are shown in two dotted line directions in fig. 4. In this embodiment, after the pressure reduction processing, a secondary pressure reduction processing is further included, and when the pressure values in the sample gas detection bypass and the sample gas detection trunk are detected within the preset pressure range, the first air inlet valve 13, the third air inlet valve 10, the second air inlet valve 11, the third air outlet valve 12, and the second air outlet valve 15 are closed, the first air outlet valve 14 and the fourth air outlet valve 16 are opened, and the air pump 50 is started until the first pressure value detected by the first pressure sensor 41 reaches the preset pressure value, and the air pump 50 is closed. The purpose of the secondary pressure reduction processing is only to reduce the other parts in the detection sample gas detection bypass to a preset pressure value, the specific gas flow direction diagram is shown by a dotted line in fig. 5, and there is only one direction of flow direction: flows through the first inlet valve 13, the methane detector 32, the first pressure sensor 41, the first outlet valve 14, the air pump 50, and finally passes through the fourth outlet valve 16 to be discharged from the outlet port 01. In this embodiment, the preset air pressure value does not reach the preset air pressure range. For example, the preset air pressure range is 900-1000 mbar, the preset air pressure value is less than 900mbar, and the preset air pressure range and the preset air pressure value are set according to actual requirements and the actual air pressure practical range of the sensor. The step realizes the air pressure difference between the detection sample gas detection bypass and the detection sample gas detection main line, and the average air pressure in the exhaled gas analyzer is lower in the process, so that the sample gas bag and the exhaled gas analyzer have a larger pressure difference, more sample gas can be inhaled, and the detection accuracy is improved.
The schematic flow of the sample gas is shown in fig. 6, and the gas flows from the gas inlet end into three flow directions: firstly, the gas flows through the first gas inlet valve 13, the methane detector 32, the first pressure sensor 41, the first gas outlet valve 14, the air pump 50, and finally passes through the fourth gas outlet valve 16 and is discharged from the gas outlet 01. Secondly, the gas flows through the first gas inlet valve 13, the methane detector 32, the first pressure sensor 41, the second gas outlet valve 15 and the air pump 50, and finally is discharged from the gas outlet 01 through the fourth gas outlet valve 16. Thirdly, the gas flows through the second gas inlet valve 11, the carbon dioxide detector 30, the hydrogen detector 31, the second pressure sensor 40, the third gas outlet valve 12 and the air pump 50, and finally is discharged from the gas outlet 01 through the fourth gas outlet valve 16. The three sample gas flowing ways enable the sample gas detection bypass and the sample gas detection main line to have sample gas, if the sample gas is uniformly diffused in the respiratory gas analyzer and then is detected, much time is consumed, and the work efficiency of the exhaled gas analyzer is greatly reduced. Therefore, the following method is adopted in the embodiment to realize the gas circulation mixing in the exhaled gas analyzer. The sample gas suction comprises the steps of inserting a sample gas bag containing sample gas into the gas inlet 00, starting the air suction pump 50, closing the third gas inlet valve 10, the first gas outlet valve 14 and the fourth gas outlet valve 16 after the sample gas is sucked into the gas inlet 00, and opening the first gas inlet valve 13, the second gas inlet valve 11, the second gas outlet valve 15 and the third gas outlet valve 12, wherein in the operation process of the air suction pump 50, the sample gas detection bypass and the sample gas detection main path form a circulation channel, the sample gas circularly flows in the circulation channel, and the sample gas is fully mixed with the air in the circulation channel; the specific gas flow direction is shown by the dotted line in fig. 7, and the gas flow direction is sequentially as follows: the first intake valve 13 → the methane sensor 32 → the first pressure sensor 41 → the second outlet valve 15 → the air pump 50 → the third outlet valve 12 → the second pressure sensor 40 → the hydrogen sensor 31 → the carbon dioxide sensor 30 → the second intake valve 11 → the first intake valve 13; a closed circulating channel is formed, so that the sample gas and the air are fully mixed, and the measured result is more accurate.
And (3) detecting the sample gas, wherein in the process of flowing the sample gas in the circulating channel, the carbon dioxide detector 30 detects the carbon dioxide concentration value in the sample gas, the hydrogen detector 31 detects the hydrogen concentration value in the sample gas, and the methane detector 32 detects the methane concentration value in the sample gas.
And correcting the detection value, namely correcting the hydrogen concentration value and the methane concentration value according to the carbon dioxide concentration value and the carbon dioxide concentration standard value to obtain a corrected hydrogen concentration value and a corrected methane concentration value. The carbon dioxide concentration value is used as a reference value, and the methane gas concentration value and the hydrogen gas concentration value are corrected according to the carbon dioxide concentration value, so that the obtained result is more accurate. If the carbon dioxide concentration value is more than or equal to 5%, directly displaying the detected concentration values of hydrogen and methane; otherwise, correcting the hydrogen concentration value to be 5%/(carbon dioxide content) by hydrogen detection concentration value; the methane concentration value is corrected to 5%/(carbon dioxide content) × methane detected concentration value.
And outputting a detection value, and outputting and displaying the corrected hydrogen concentration value and the corrected methane concentration value. At this time, the sample bag is pulled out, and the expired gas analyzer is returned to the standby state. When the exhaled gas analyzer is turned off, the vacuum pump is turned off, the gas valves are all opened, and when the second gas pressure sensor 40 and the first gas pressure sensor 41 are restored to the atmospheric pressure state, the exhaled gas analyzer is powered off.
The application provides an operation method of expired gas analysis appearance, has following technological effect: 1. the combination of the sample gas detection bypass and the sample gas detection trunk is used for dealing with the pressure of various detectors in the exhaled gas analyzer, so that the stability and the reliability of the various detectors are facilitated, a certain air pressure difference is formed in the exhaled gas analyzer, the pressure reduction treatment is facilitated, and the calibration period and the service life of each detector are effectively prolonged. 2. By adopting a chamber pressure reduction processing mode, the pressure difference occurs in the exhaled gas analyzer, so that sample gas can enter the analyzer quickly, the detection efficiency can be improved, and the workload of operators can be reduced. 3. Through repeated pumping and flushing in the chamber flushing treatment, residual gas in the expired gas analyzer is effectively removed, and cross contamination among different samples is avoided. 4. Through sample suction treatment, a sample gas detection bypass and a sample gas detection main circuit form a circulating channel, the sample gas circularly flows in the circulating channel, and the sample gas is mixed with air in the circulating channel; the main path and the bypass are switched from parallel connection to series connection, so that each path of gas in the main path and the bypass can be fully mixed, and the accuracy of a detection result is improved.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. An expired gas analyzer, characterized in that: including inlet end, sample gas detection bypass, sample gas detection trunk, a plurality of gas pipe, give vent to anger end and aspiration pump, sample gas detection bypass includes first admission valve, methane detector, first pressure sensor, first air outlet valve and second air outlet valve, first admission valve the methane detector loop through between the first pressure sensor the gas pipe is connected, first pressure sensor respectively with first air outlet valve and the one end of second air outlet valve is connected, sample gas detection trunk includes second admission valve, carbon dioxide detector, hydrogen detector, second pressure sensor and third air outlet valve, the second admission valve, the carbon dioxide detector the hydrogen detector the second pressure sensor and the third air outlet valve loops through gas pipe interconnect, the first air inlet valve, the second air inlet valve and the air inlet end are connected through the gas guide pipe, one end of the air pump, the first air outlet valve and the third air outlet valve are connected through the gas guide pipe, and the other end of the air pump, the second air outlet valve and the air outlet end are connected through the gas guide pipe.
2. An exhaled breath analyzer according to claim 1, wherein: the air inlet end comprises an air inlet, a third air inlet valve and a filter element, the air inlet, the third air inlet valve and the filter element sequentially pass through the gas guide pipe connection, sample gas enters from the air inlet, passes through the third air inlet valve to the filter element, and the filter element filters moisture in the sample gas.
3. An exhaled breath analyzer according to claim 2, wherein: the filter element is positioned between the second air inlet valve and the third air inlet valve.
4. An exhaled breath analyzer according to claim 1, wherein: the air outlet end comprises a fourth air outlet valve and an air outlet, one end of the fourth air outlet valve is connected with the air outlet through the air guide pipe, and the other end of the fourth air outlet valve is connected with the air pump through the air guide pipe.
5. An operating method of an exhaled gas analyzer, which is applied to the exhaled gas analyzer according to any one of claims 1 to 4, comprising the steps of:
performing chamber flushing treatment, closing the second air outlet valve, respectively opening the air inlet, the first air inlet valve, the second air inlet valve, the third air inlet valve, the first air outlet valve, the third air outlet valve, the fourth air outlet valve and the air outlet, starting the air pump, pumping air from the air inlet by the air pump, closing the third air inlet valve after air enters from the air inlet, pumping the gas in the sample gas detection bypass and the sample gas detection trunk to the air outlet by the air pump, and discharging residual sample gas in the exhaled gas analyzer;
the method comprises the steps of performing chamber depressurization treatment, closing a third air inlet valve and a second air outlet valve, opening a first air inlet valve, a second air inlet valve, a first air outlet valve, a third air outlet valve and a fourth air outlet valve, opening an air pump, pumping out gas in a sample gas detection bypass and a sample gas detection main road by the air pump, detecting the air pressure value in the sample gas detection bypass by a first pressure sensor, detecting the air pressure value in the sample gas detection main road by a second pressure sensor, and closing the air pump when the air pressure values in the sample gas detection bypass and the sample gas detection main road are detected to be within a preset air pressure range;
the method comprises the steps that sample gas is sucked, a sample gas bag containing the sample gas is inserted into a gas inlet, a suction pump is started, after the sample gas is sucked into the gas inlet, a third gas inlet valve, a first gas outlet valve and a fourth gas outlet valve are closed, a first gas inlet valve, a second gas outlet valve and a third gas outlet valve are opened, in the operation process of the suction pump, a sample gas detection bypass and a sample gas detection trunk form a circulation channel, the sample gas circularly flows in the circulation channel, and the sample gas is mixed with air in the circulation channel;
detecting a sample gas, wherein in the process of flowing the sample gas in the circulating channel, a carbon dioxide detector detects a carbon dioxide concentration value in the sample gas, a hydrogen detector detects a hydrogen concentration value in the sample gas, and a methane detector detects a methane concentration value in the sample gas;
correcting the detection value, namely correcting the hydrogen concentration value and the methane concentration value according to the carbon dioxide concentration value and the carbon dioxide concentration standard value to obtain a corrected hydrogen concentration value and a corrected methane concentration value;
and outputting a detection value, and outputting and displaying the corrected hydrogen concentration value and the corrected methane concentration value.
6. A method of operating an exhaled breath analyzer according to claim 5, wherein: the chamber rinse process specifically includes:
performing inflation treatment, namely closing the second air outlet valve, respectively opening the air inlet, the first air inlet valve, the second air inlet valve, the third air inlet valve, the first air outlet valve, the third air outlet valve, the fourth air outlet valve and the air outlet, and starting an air pump, wherein the air pump sucks air from the air inlet;
and air pumping treatment, namely closing the third air inlet valve after air enters from the air inlet, and pumping the gas in the sample gas detection bypass and the sample gas detection trunk to the air outlet by using an air pump to discharge.
7. A method of operating an exhaled breath analyzer according to claim 6, wherein: and after the times of the air pumping treatment and the air inflation treatment reach a preset pumping number of times, the step of chamber flushing treatment is finished.
8. A method of operating an exhaled breath analyzer according to claim 5, wherein: the chamber pressure reduction treatment further comprises secondary pressure reduction treatment, when the pressure values in the sample gas detection bypass and the sample gas detection trunk are detected within a preset pressure range, the first air inlet valve, the third air inlet valve, the second air inlet valve, the third air outlet valve and the second air outlet valve are closed, the first air outlet valve and the fourth air outlet valve are opened, the air pump is started, and the air pump is closed until the first pressure value detected by the first pressure sensor reaches the preset pressure value.
9. A method of operating an exhaled breath analyzer according to claim 8, wherein: when the secondary depressurization treatment is finished, the pressure value detected by the first pressure sensor is smaller than the pressure value detected by the second pressure sensor.
10. A method of operating an exhaled breath analyzer according to claim 8, wherein: and the preset air pressure value does not reach the preset air pressure range.
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