CN215985890U - Methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow - Google Patents
Methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow Download PDFInfo
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- CN215985890U CN215985890U CN202121401321.4U CN202121401321U CN215985890U CN 215985890 U CN215985890 U CN 215985890U CN 202121401321 U CN202121401321 U CN 202121401321U CN 215985890 U CN215985890 U CN 215985890U
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Abstract
The utility model discloses a methane and hydrogen exhaled gas detection device capable of controlling stable output of gas flow, which comprises a sample gas inlet, a first drying module, a first two-phase three-way valve, a sample gas storage device and a second two-phase three-way valve, wherein the sample gas inlet is communicated with the first drying module, the first two-phase three-way valve, the sample gas storage device and the second two-phase three-way valve in sequence to form a sample gas inlet passage; the carrier gas inlet is sequentially connected with the second drying module, the carrier gas air pump, the airflow buffer device, the regulating valve, the flowmeter, the second two-phase three-way valve, the sample gas storage device, the first two-phase three-way valve, the third two-phase three-way valve and the chromatographic column, and the methane and hydrogen detection module to form a detection passage; the carrier gas forms airflow with stable flow after passing through the airflow buffer device, and the sample gas stored in the sample gas storage device is conveyed to the chromatographic column and the methane and hydrogen detection module through the detection passage. The utility model has simple structure, switches the detection passage and the sample injection gas passage by using a plurality of two-phase three-way valves, and ensures that gas flow can stably pass through the chromatographic column by using the gas flow buffer device, thereby improving the detection accuracy of methane and hydrogen.
Description
Technical Field
The utility model relates to the technical field of exhaled gas detection, in particular to a methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow.
Background
The exhalation test measures gases produced in the intestine and diffusing into the systemic circulation and exhaled through the lungs. There are 4 major sources of intestinal gas: swallowing and air mixing with food, chemical reactions in the intestine, diffusion of gases in the blood and metabolism of microorganisms. Intestinal gas of healthy people is mainly composed of carbon dioxide (CO2), hydrogen (H2), and methane (CH 4). Certain intestinal flora can consume hydrogen to produce methane, thereby reducing the content of hydrogen in exhaled breath, even causing false negative results, and further reducing the accuracy of hydrogen exhalation. For non-hydrogen producing people, the test accuracy can be improved by taking methane as a substitute target, the incidence rate of false negative can be reduced by simultaneously measuring hydrogen and methane in exhaled gas, and the specificity and sensitivity of diagnosis are improved.
The methane-hydrogen breath test is a method for researching physiology or diseases by orally taking a certain amount of carbohydrate substrates (such as lactose, lactulose and the like) for a patient, detecting the concentration change of carbon dioxide, hydrogen, methane and the like in exhaled air after the substrates are fermented in intestinal tracts, and has certain help for diagnosing and screening clinical gastrointestinal diseases due to the characteristics of safety, non-invasiveness, effectiveness and simplicity. Currently, methane hydrogen breath tests have made great progress in the detection of lactose intolerance, in the diagnosis of small intestine bacterial overgrowth, and in colorectal cancer screening.
At present, the expired gas detection of methane and hydrogen generally adopts detection means such as a gas chromatography technology, an electrochemical technology, a solid-state sensor technology and the like. The gas chromatograph is a chemical analysis instrument for accurately separating compounds in complex samples, but the detection requirement of multiple samples and large data is difficult to realize due to the complex and expensive equipment and the long examination time required.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow.
The utility model discloses a methane and hydrogen expired gas detection device capable of controlling stable output of gas flow, which comprises a carrier gas air pump, a gas flow buffer device, a regulating valve, a flow meter, a first drying module, a second drying module, a sample gas storage device, a chromatographic column, a methane and hydrogen detection module, a first two-phase three-way valve, a second two-phase three-way valve and a third two-phase three-way valve, wherein the carrier gas air pump is connected with the gas flow buffer device;
the sample gas inlet is sequentially communicated with the first drying module, the first two-phase three-way valve, the sample gas storage device and the second two-phase three-way valve to form a sample gas channel, and sample gas is stored in the sample gas storage device through the sample gas channel;
the carrier gas inlet is sequentially connected with the second drying module, the carrier gas pump, the airflow buffer device, the regulating valve, the flow meter, the second two-phase three-way valve, the sample gas storage device, the first two-phase three-way valve, the third two-phase three-way valve, the chromatographic column and the methane and hydrogen detection module to form a detection passage; the carrier gas forms airflow with stable flow after passing through the airflow buffer device, and the sample gas stored in the sample gas storage device is conveyed to the chromatographic column and the methane and hydrogen detection module through the detection passage;
the first two-phase three-way valve, the second two-phase three-way valve and the third two-phase three-way valve are used for switching the sample gas inlet passage and the detection passage.
As a further improvement of the present invention, the sample gas passage further includes a filter for filtering the sample gas, and the filter is disposed between the first drying module and the first two-phase three-way valve.
As a further improvement of the present invention, the detection path further comprises a carbon dioxide detection module;
the carbon dioxide detection module is arranged between the third two-phase three-way valve and the chromatographic column and used for detecting the concentration of carbon dioxide in the exhaled air.
As a further improvement of the present invention, the output end of the flow meter is further directly connected to the third two-phase three-way valve through a branch line, so that the carrier gas inlet, the second drying module, the carrier gas pump, the regulating valve, the flow meter, the third two-phase three-way valve, the carbon dioxide detection module, the chromatographic column, and the methane and hydrogen detection module form a detection unit cleaning path.
As a further improvement of the utility model, the carbon dioxide detection module is a carbon dioxide sensor.
As a further improvement of the present invention, the first drying module and the second drying module are both drying agents.
As a further improvement of the utility model, the sample gas storage device is a gas storage metal pipe, and the gas flow buffering device is a gas collecting bottle.
As a further improvement of the present invention, the first two-phase three-way valve, the second two-phase three-way valve, and the third two-phase three-way valve are all two-phase three-way solenoid valves.
As a further improvement of the utility model, the methane and hydrogen detection module is an MOS type sensor.
Compared with the prior art, the utility model has the beneficial effects that:
the gas flow buffer device can control the stable output of the gas flow output by the carrier gas air pump, so that the gas flow buffer device drives the sample gas in the sample gas storage device to stably pass through the chromatographic column, and simultaneously, the chromatographic column, the methane and hydrogen detection module are arranged, so that methane and hydrogen can asynchronously pass through the methane and hydrogen detection module in sequence through the chromatographic column, the methane and hydrogen detection module can detect the concentration of the hydrogen passing through first, and then the concentration of the methane gas passing through is detected, and the detection accuracy of the concentration of the methane and the hydrogen is further improved;
the utility model not only detects the methane and the hydrogen in the exhaled air, but also increases the carbon dioxide gas detection, realizes the simultaneous detection of the methane, the hydrogen and the carbon dioxide in the exhaled air, increases the detection efficiency of the utility model, and improves the reliable data support for the detection of clinical medicine;
according to the first two-phase three-way valve, the second two-phase three-way valve and the third two-phase three-way valve, the switching of the sample gas channel and the detection channel is realized by opening and closing different gas flow channels of the first two-phase three-way valve, the second two-phase three-way valve and the third two-phase three-way valve, and the detection efficiency of the exhaled gas is improved.
Drawings
FIG. 1 is a pipeline connection diagram of a methane and hydrogen expired gas detection device capable of controlling stable output of gas flow, which is disclosed by the utility model;
FIG. 2 is a sample gas flow diagram of the methane and hydrogen exhaled gas detection device capable of controlling stable gas flow output according to the present invention;
fig. 3 is a carrier gas flow diagram of the methane and hydrogen exhaled gas detection device capable of controlling stable output of gas flow disclosed by the utility model.
In the figure:
1. a sample gas inlet; 2-1, a first drying module; 2-2, a second drying module; 3. a filter; 4. a gas-carrying air pump; 5. a gas collection bottle; 6. adjusting a valve; 7-1, a first two-phase three-way valve; 7-2, a second two-phase three-way valve; 7-3, a third two-phase three-way valve; 8. a gas storage metal tube; 9. a carbon dioxide detection module; 10. a chromatographic column; 11. a methane and hydrogen detection module; 12. and a flow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the utility model discloses a methane and hydrogen expired gas detection device capable of controlling stable output of gas flow, which comprises a carrier gas air pump 4, a gas flow buffer device, a regulating valve 6, a flow meter 12, a first drying module 2-1, a second drying module 2-2, a sample gas storage device, a chromatographic column 10, a methane and hydrogen detection module 11, a first two-phase three-way valve 7-1, a second two-phase three-way valve 7-2 and a third two-phase three-way valve 7-3; the sample gas inlet is communicated with the first drying module 2-1, the first two-phase three-way valve 7-1, the sample gas storage device and the second two-phase three-way valve 7-2 in sequence to form a sample gas channel, and the sample gas is stored in the sample gas storage device through the sample gas channel; the carrier gas inlet is sequentially connected with a second drying module 2-2, a carrier gas air pump 4, an airflow buffer device, a regulating valve 6, a flow meter 12, a second two-phase three-way valve 7-2, a sample gas storage device, a first two-phase three-way valve 7-1, a third two-phase three-way valve 7-3, a chromatographic column 10 and a methane and hydrogen detection module 11 to form a detection passage; the carrier gas forms airflow with stable flow after passing through the airflow buffer device, and the sample gas stored in the sample gas storage device is conveyed to the chromatographic column 10 and the methane and hydrogen detection module 11 through the detection passage; the first two-phase three-way valve 7-1, the second two-phase three-way valve 7-2 and the third two-phase three-way valve 7-3 are used for switching a sample gas inlet passage and a detection passage.
The gas flow buffer device can control the stable output of the gas flow output by the carrier gas air pump 4, so that the gas flow drives the sample gas in the sample gas storage device to stably pass through the chromatographic column, and meanwhile, the chromatographic column 10 and the methane and hydrogen detection module 11 are arranged, so that methane and hydrogen can asynchronously pass through the methane and hydrogen detection module 11 in sequence through the chromatographic column 10, the methane and hydrogen detection module 11 can detect the concentration of the hydrogen passing through first, and then detect the concentration of the methane gas passing through, and the detection accuracy of the concentrations of methane and hydrogen is further improved; by arranging the first two-phase three-way valve 7-1, the second two-phase three-way valve 7-2 and the third two-phase three-way valve 7-3 and opening and closing different airflow channels of the first two-phase three-way valve 7-1, the second two-phase three-way valve 7-2 and the third two-phase three-way valve 7-3, switching of a sample gas channel and a detection channel is realized, and the detection efficiency of exhaled gas is improved.
Specifically, the method comprises the following steps:
as shown in fig. 2, the sample gas channel of the present invention further includes a filter 3 for filtering the sample gas, and the filter 3 is disposed between the first drying module 2-1 and the first two-phase three-way valve 7-1.
Furthermore, one end of the sample gas storage device is connected with an exhaust port of the first two-phase three-way valve 7-1, the other end of the sample gas storage device is connected with an exhaust port of the second two-phase three-way valve 7-2, the sample gas inlet 1 is connected with an air inlet of the first drying module 2-1, the filter 3 and the first two-phase three-way valve 7-1 sequentially through pipelines, and a sample gas passage is formed by the sample gas inlet 1, the first drying module 2-1, the filter 3, the first two-phase three-way valve 7-1, the sample gas storage device and the second two-phase three-way valve 7-2. The gas storage device of the utility model preferably selects the gas storage metal pipe 8.
When the sample gas is actually injected, the sample gas to be detected is injected from the sample gas inlet 1, and is discharged through the first drying module 2-1, the filter 3, the gas inlet of the first two-phase three-way valve 7-1, the gas storage metal pipe 8 and the gas outlet of the second two-phase three-way valve 7-2, so that the sample gas to be detected is stored in the gas storage metal pipe 8.
Further, when sample gas is injected, the gas outlet of the first two-phase three-way valve 7-1 and the gas inlet of the second two-phase three-way valve 7-2 are in a closed state.
Furthermore, when the sample gas is injected, the gas-suction pump is arranged at the tail end of the sample gas passage, namely the gas outlet of the second two-phase three-way valve 7-2, and the sample gas at the sample gas inlet 1 is pumped into the gas storage metal pipe 8 through the gas-suction pump; the sample gas may also be injected manually by using a syringe at the sample gas inlet 1.
As shown in fig. 3, the detection path of the present invention further includes a carbon dioxide detection module 9; the carbon dioxide detection module 9 is arranged between the third two-phase three-way valve 7-3 and the chromatographic column 10 and is used for detecting the concentration of carbon dioxide in the exhaled air;
furthermore, the setting of the flow meter 12 of the utility model enables an operator to pay attention to the carrier gas flow at any time and adjust the carrier gas flow value passing through in time so as to achieve the optimal detection environment, and the actual carrier gas flow of the utility model can be adjusted according to the specific experiment requirements.
During actual gas detection, the carrier gas of the carrier gas air pump 1 passes through the airflow buffer device, the regulating valve 6, the air inlet of the second two-phase three-way valve 7-2, the air outlet of the second two-phase three-way valve 7-2, the gas storage metal pipe 8, the air outlet of the first two-phase three-way valve 7-1, the air inlet of the third two-phase three-way valve 7-3 and the air outlet of the third two-phase three-way valve 7-3, and the sample gas stored in the gas storage metal pipe 8 is conveyed to the carbon dioxide detection module 9, the chromatographic column 10 and the methane and hydrogen detection module 11 to realize detection of exhaled gas. According to the utility model, the gas collecting bottle is preferably selected as the gas flow buffering device, and the gas collecting bottle 5 is arranged, so that after the carrier gas air pump 4 is opened, the carrier gas provided by the carrier gas air pump 4 can buffer the gas flow when passing through the gas collecting bottle 5, and further stable carrier gas flow is output, the phenomenon that the chromatographic column 10 cannot work normally due to unstable gas flow is avoided, and the detection accuracy of methane, hydrogen and carbon dioxide is further improved.
Further, the output end of the flow meter 12 is directly connected with the third two-phase three-way valve 7-3 through a branch pipeline, so that the carrier gas inlet, the second drying module 2-2, the carrier gas pump 4, the regulating valve 6, the flow meter 12, the third two-phase three-way valve 7-3, the carbon dioxide detection module 9, the chromatographic column 10 and the methane and hydrogen detection module 11 form a detection unit cleaning passage, and in practical application, the carrier gas can directly flow into the carbon dioxide detection module 9, the chromatographic column 10, the methane and hydrogen detection module 11 through the gas outlet of the third two-phase three-way valve 7-3, so that the carbon dioxide detection module 9, the chromatographic column 10, the methane and hydrogen detection module 11 can be cleaned. When the gas storage metal tube 8 needs to be cleaned synchronously, the gas outlet metal tube 8, the carbon dioxide detection module 9, the chromatographic column 10 and the methane and hydrogen detection module 11 can be cleaned synchronously through the detection passage.
Further, the first drying module 2-1 and the second drying module 2-2 of the present invention are both drying agents.
Furthermore, the first two-phase three-way valve 7-1, the second two-phase three-way valve 7-2 and the third two-phase three-way valve 7-3 are two-phase three-way electromagnetic valves.
Further, the carbon dioxide detection module 9 of the present invention is a carbon dioxide sensor, and the carbon dioxide sensor is used for detecting the concentration of carbon dioxide in the exhaled sample gas.
Furthermore, the chromatographic column 10 of the utility model uses a stationary phase HaySepQ filler, which can effectively separate hydrogen and methane, so that two gases pass through the methane cleaning detection module 11 after being separated by the chromatographic column 10, and in order to ensure the effective work of the chromatographic column 10, the utility model ensures the output stability of carrier gas flow by arranging the gas collection bottle 5, and improves the detection accuracy of the chromatographic column 10 and the methane and hydrogen detection module 11.
Furthermore, the methane and hydrogen detection module is an MOS sensor of TGS813 and 2611 series, has good sensitivity to combustible gas, has no obvious response to most components except hydrogen and methane in exhaled gas, and ensures the detection accuracy of methane and hydrogen to a certain extent.
The application method of the embodiment comprises the following steps:
1) and standby state: in a standby state, the carrier gas air pump 4 is in a normally open state, the air inlet and the air outlet of the first two-phase three-way valve 7-1, the air outlet and the air outlet of the second two-phase three-way valve 7-2 and the air outlet of the third two-phase three-way valve 7-3 are in an open state, so that the carbon dioxide detection module 9, the chromatographic column 10 and the methane and hydrogen detection module 11 are always in an air passing state;
2) injecting sample gas: an operator stores the sample gas to be detected into the gas storage metal tube 8 through the sample gas inlet passage by using an injector or an air suction pump;
3) and detecting sample gas: after the sample gas to be detected is collected, closing the gas inlet of the first two-phase three-way valve 7-1, the gas outlet of the second two-phase three-way valve 7-2 and the gas outlet of the third two-phase three-way valve 7-3, opening the gas outlet of the first two-phase three-way valve 7-1, the gas inlet of the second two-phase three-way valve 7-2 and the gas inlet of the third two-phase three-way valve 7-3, and conveying the sample gas to be detected stored in the gas storage metal pipe 8 to the carbon dioxide detection module 9, the chromatographic column 10 and the methane and hydrogen detection module 11 by using carrier gas through a detection passage to complete the detection of the carbon dioxide concentration, the methane concentration and the hydrogen concentration of the sample gas to be detected;
4) and cleaning and emptying: after the detection is finished, the system is restored to the standby state and kept for a period of time, so that the cleaning and emptying work is realized, and the cleaning and emptying work of the carbon dioxide detection module 9, the chromatographic column 10 and the methane and hydrogen detection module 11 can also be finished through the detection unit cleaning passage.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow is characterized by comprising a carrier gas air pump, an airflow buffer device, a regulating valve, a flowmeter, a first drying module, a second drying module, a sample gas storage device, a chromatographic column, a methane and hydrogen detection module, a first two-phase three-way valve, a second two-phase three-way valve and a third two-phase three-way valve;
the sample gas inlet is sequentially communicated with the first drying module, the first two-phase three-way valve, the sample gas storage device and the second two-phase three-way valve to form a sample gas channel, and sample gas is stored in the sample gas storage device through the sample gas channel;
the carrier gas inlet is sequentially connected with the second drying module, the carrier gas pump, the airflow buffer device, the regulating valve, the flow meter, the second two-phase three-way valve, the sample gas storage device, the first two-phase three-way valve, the third two-phase three-way valve, the chromatographic column and the methane and hydrogen detection module to form a detection passage; the carrier gas forms airflow with stable flow after passing through the airflow buffer device, and the sample gas stored in the sample gas storage device is conveyed to the chromatographic column and the methane and hydrogen detection module through the detection passage;
the first two-phase three-way valve, the second two-phase three-way valve and the third two-phase three-way valve are used for switching the sample gas inlet passage and the detection passage.
2. The exhaled gas detection apparatus of claim 1, wherein the sample gas pathway further comprises a filter for filtering the sample gas, the filter being disposed between the first drying module and the first two-phase three-way valve.
3. The exhaled breath detection apparatus of claim 1, wherein the detection pathway further comprises a carbon dioxide detection module;
the carbon dioxide detection module is arranged between the third two-phase three-way valve and the chromatographic column and used for detecting the concentration of carbon dioxide in the exhaled air.
4. The exhaled gas detection apparatus according to claim 3, wherein the output end of the flow meter is further directly connected to the third two-phase three-way valve through a branch line, so that the carrier gas inlet, the second drying module, the carrier gas pump, the regulating valve, the flow meter, the third two-phase three-way valve, the carbon dioxide detection module, the chromatographic column, and the methane and hydrogen detection module constitute a detection unit cleaning path.
5. The exhaled breath detection apparatus of claim 4, wherein the carbon dioxide detection module is a carbon dioxide sensor.
6. The exhaled gas detection apparatus of claim 1, wherein the first and second drying modules are both desiccants.
7. The exhaled breath detection apparatus of claim 1, wherein the sample gas storage device is a metal gas storage tube and the gas flow buffering device is a gas collection bottle.
8. The exhaled gas detection apparatus according to claim 1, wherein the first two-phase three-way valve, the second two-phase three-way valve, and the third two-phase three-way valve are each a two-phase three-way solenoid valve.
9. The exhaled breath detection apparatus of claim 1, wherein the methane, hydrogen detection module is a MOS type sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121401321.4U CN215985890U (en) | 2021-06-23 | 2021-06-23 | Methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121401321.4U CN215985890U (en) | 2021-06-23 | 2021-06-23 | Methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow |
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| CN215985890U true CN215985890U (en) | 2022-03-08 |
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| CN202121401321.4U Active CN215985890U (en) | 2021-06-23 | 2021-06-23 | Methane and hydrogen exhaled gas detection device capable of controlling stable output of airflow |
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