CN219285132U - High-precision analysis gas circuit system for medical metabolic cabin - Google Patents
High-precision analysis gas circuit system for medical metabolic cabin Download PDFInfo
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- CN219285132U CN219285132U CN202223541968.4U CN202223541968U CN219285132U CN 219285132 U CN219285132 U CN 219285132U CN 202223541968 U CN202223541968 U CN 202223541968U CN 219285132 U CN219285132 U CN 219285132U
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Abstract
The utility model discloses a high-precision analysis gas circuit system of a medical metabolic cabin, which comprises a metabolic cabin body with a gas inlet and a gas outlet, wherein a gas inlet sampling passage is arranged at the gas inlet, a gas outlet sampling passage is arranged at the gas outlet, a calibration gas passage used for drift calibration and measurement and recovery of initial values in a gas measurement process and a detection gas passage used for detecting sample gas collected by the gas inlet sampling passage and the gas outlet sampling passage are connected through another two-position three-way electromagnetic valve of a two-position three-way electromagnetic valve shared by the gas inlet sampling passage and the gas outlet sampling passage.
Description
Technical Field
The utility model belongs to the technical field of medical metabolic cabins, and particularly relates to a high-precision analysis gas circuit system of a medical metabolic cabin.
Background
The medical metabolism cabin is a relatively closed space, and the testee can freely move in the relatively comfortable cabin for 24 hours to several days, and can cause the human body to exhale CO according to different external intervention stimuli 2 And inhale human O 2 The weak change of the content is accurately collected and analyzed, and the dynamic metabolic rate of the human body is measured by an indirect caloric method. Metabolic cabins are one of the gold standards for determining human energy consumption today. The accuracy and convenience of the gas collection and analysis gas circuit of the metabolic cabin are particularly important.
For example, chinese patent application CN202210207775.0 discloses a digital energy metabolism monitoring platform and its standard metabolic compartment, and the specific contents are: a standard metabolic compartment is provided with an air inlet and an air outlet for inflow and outflow of an air flow of the metabolic compartment, respectively. The metabolic compartment also comprises a third water vapor analyzer and a third CO 2 Analyzer and third O 2 An analyzer, a third water vapor analyzer, and a third CO 2 Analyzer and third O 2 And the analyzer is connected with the passage of the air inlet or the passage of the air outlet through a change-over switch, and alternately and real-time sampling, monitoring and analyzing the inflow air flow of the metabolic cabin and the outflow air flow of the metabolic cabin. The system is provided with an environment simulation and control system, and can meet the standard metabolic cabin for monitoring and researching human energy metabolism.
The standard metabolism cabin can meet the requirements of human energy metabolism monitoring research, but the air inlet and the air exhaust of the standard metabolism cabin are respectively connected and provided with one path of detection equipment for detection, the air path is more complicated in actual arrangement, and the later equipment needing maintenance is more, so that the use cost is higher.
Disclosure of Invention
The utility model aims to provide a high-precision analysis gas circuit system for a medical metabolic cabin, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a high-precision analysis gas circuit system of a medical metabolic cabin comprises a metabolic cabin body with a gas inlet and a gas outlet, wherein an air inlet fan for air inlet is connected to the gas inlet through a mass flow controller, a gas outlet fan for gas outlet is connected to the gas outlet through a mass flow controller, a laminar flow treatment pipeline is arranged between the mass flow controller and the gas outlet fan at the gas outlet, an air inlet sampling passage is arranged between the mass flow controller and the air inlet fan at the gas inlet, and a gas outlet sampling passage is arranged between the mass flow controller and the laminar flow treatment pipeline at the gas outlet;
a fan for gas circulation is arranged between the air inlet and the air outlet, the input end of the fan for gas circulation is arranged between the air outlet and the mass flow controller at the air outlet through a corrugated hose, and the output end of the fan for gas circulation is arranged between the air inlet and the mass flow controller at the air inlet through a corrugated hose;
the air inlet sampling passage is formed by connecting a diaphragm pump arranged between a fan at an air inlet and mass flow control with a normally closed port of a two-position three-way electromagnetic valve, and an air leakage branch with a two-position two-way normally open electromagnetic valve is arranged between the diaphragm pump and an air passage of the two-position three-way electromagnetic valve; the exhaust sampling passage is formed by connecting a diaphragm pump arranged between a mass flow controller at an exhaust port and a laminar flow treatment pipeline with a normally open port of a two-position three-way electromagnetic valve in an intake sampling passage, and a gas leakage branch with a two-position two-way normally closed electromagnetic valve is arranged between the diaphragm pump and a gas path of the two-position three-way electromagnetic valve;
the other normally open end of the two-position three-way electromagnetic valve shared by the air inlet sampling passage and the air exhaust sampling passage is connected with a normally open port of a new two-position three-way electromagnetic valve, the normally closed port of the two-position three-way electromagnetic valve is connected with a calibration gas passage for drift calibration and measurement recovery initial value in the gas measurement process, and the other normally open port of the two-position three-way electromagnetic valve is connected with a detection gas passage for detecting sample gas collected by the air inlet sampling passage and the air exhaust sampling passage.
Preferably, the detection gas passage comprises a sample gas conveying detection gas passage and a reference gas conveying detection gas passage, the sample gas conveying detection gas passage comprises a drying pipe connected with a normally open port of a two-position three-way electromagnetic valve which is connected with the two-position three-way electromagnetic valve shared by the air inlet sampling passage and the air outlet sampling passage, the output end of the drying pipe is connected with the input end of an electronic pressure controller, the output end of the electronic pressure controller is connected with the input end of a ruby air resistor, the output end of the ruby air resistor is connected with the input end of a carbon dioxide sensor, the output end of the carbon dioxide is connected with one output end of an oxygen sensor, and the output end of the oxygen sensor is communicated with the atmosphere;
the reference gas conveying detection gas circuit comprises a ruby gas resistor, the output end of which is connected with the input end of the oxygen sensor reference gas, the input end of the ruby gas resistor is connected with the output end of another electronic pressure controller, the input end of the electronic pressure controller is connected with a gas cylinder of the oxygen sensor reference gas, and a pressure reducing valve for controlling the output pressure of the gas cylinder of the oxygen sensor reference gas is connected in series with a pipeline between the input end of the electronic pressure controller and the output end of the gas cylinder of the oxygen sensor reference gas.
Preferably, the calibration gas passage comprises a two-position three-way electromagnetic valve connected with a normally closed port of the two-position three-way electromagnetic valve which is connected with the two-position three-way electromagnetic valve shared by the air inlet sampling passage and the air outlet sampling passage, a calibration gas passage for drift calibration in the measurement process is arranged at a normally open end of the two-position three-way electromagnetic valve, and a calibration check gas passage for detecting the accuracy of the calibration gas passage is arranged at a normally closed end of the two-position three-way electromagnetic valve;
the calibration gas circuit comprises a two-position three-way electromagnetic valve with a normally open port connected with a normally open port of a two-position three-way electromagnetic valve in a calibration gas passage, the other normally open port and the normally closed port of the two-position three-way electromagnetic valve are connected in series with a two-position two-way normally closed electromagnetic valve, a gas cylinder for calibrating gas I is arranged at the input end of the two-position two-way normally closed electromagnetic valve connected with the normally open port of the two-position three-way electromagnetic valve, and a gas cylinder for calibrating gas II is arranged at the input end of the two-position two-way normally closed electromagnetic valve connected with the normally closed port of the two-position three-way electromagnetic valve;
the calibration checking gas circuit comprises a two-position two-way normally closed electromagnetic valve connected with a normally closed port of the two-position three-way electromagnetic valve in the calibration gas passage, and a gas cylinder for the third calibration gas is arranged at the input end of the two-position two-way normally closed electromagnetic valve.
Preferably, the gas in the first gas cylinder, the second gas cylinder and the third gas cylinder is mixed gas of nitrogen, oxygen and carbon dioxide, the ratio of nitrogen, oxygen and carbon dioxide in the first gas cylinder is 79%, 21% and 0%, the ratio of nitrogen, oxygen and carbon dioxide in the second gas cylinder is 75.5%, 19% and 5.5%, and the ratio of nitrogen, oxygen and carbon dioxide in the third gas cylinder is 77.5%, 20% and 2.5%.
Preferably, the type and the power of the fan at the air inlet, the fan at the air outlet and the fan for circulation between the air outlet and the air inlet are the same, the fan at the air inlet and the fan at the air outlet are 24V direct current brushless fans, the flow rates of the fan at the air inlet and the fan at the air outlet are 100L/min, and the flow rate of the fan for circulation between the air outlet and the air inlet is 30-40L/min.
Preferably, the laminar flow treatment pipeline is a pipeline with honeycomb-shaped gas channels inside.
Compared with the prior art, the utility model has the beneficial effects that:
1) According to the utility model, the air inlet sampling passage and the air outlet sampling passage are combined into one detection air passage, and the detection of the air inlet sampling sample and the air outlet sampling sample in a single detection air passage can be realized by controlling the switching of the electromagnetic valve, so that the air passage analysis is simpler, and the use and maintenance cost is reduced;
2) According to the utility model, the calibration gas passage is arranged, and the calibration gas passages with three different contents of nitrogen, oxygen and carbon dioxide are used for calibrating the detection gas passage, so that errors caused by gas drift are reduced, and the accuracy of gas concentration detection is improved;
3) According to the utility model, the fan for circulation is arranged between the air inlet passage and the air outlet passage, so that part of air in the exhaust air can be returned to the cabin body again for circulation, the waste of air is reduced, and meanwhile, the time for detecting in the metabolic cabin by a detector is shortened.
Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a general detection circuit of the present utility model;
FIG. 2 is a schematic diagram of a detection gas path according to the present utility model;
FIG. 3 is a schematic view of a calibration gas path of the present utility model;
FIG. 4 is a schematic cross-sectional view of a laminar flow channel according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The medical metabolism cabin is a relatively closed space, and the testee can freely move in the relatively comfortable cabin for 24 hours to several days, and can cause the human body to exhale CO according to different external intervention stimuli 2 And inhale human O 2 The weak change of the content is accurately collected and analyzed, and the dynamic metabolic rate of the human body is measured by an indirect caloric method. Metabolic cabins are one of the gold standards for determining human energy consumption today. The accuracy and convenience of the gas collection and analysis gas circuit of the metabolic compartment are particularly important.
As shown in fig. 1, the utility model provides a high-precision analysis gas circuit system for a medical metabolic cabin, wherein a gas inlet and a gas outlet are respectively arranged at one side of a metabolic cabin body, the gas inlet is arranged below the metabolic cabin body, the gas outlet is arranged above the metabolic cabin body, so that gas entering the metabolic cabin body flows in the metabolic cabin body in a mode of entering from bottom to top, the flow rate (24V brushless fan, 100L/min flow rate) for a gas inlet fan is controlled by a mass flow controller at the gas inlet, the flow rate (24V brushless fan, 100L/min flow rate) for a gas outlet fan is also controlled by the mass flow controller at the gas outlet, a laminar flow treatment pipeline is arranged between the mass flow controller and the fan, and the laminar flow treatment pipeline is a pipeline with a honeycomb gas channel inside, as shown in fig. 4, the discharged gas flow can be more stable by using the honeycomb gas channel inside the laminar flow treatment pipeline, the interference of the high-frequency noise of the fan on the mass flow controller is reduced, and the stability of the mass flow controller is improved;
an air inlet sampling passage is arranged between a mass flow controller of an air inlet and a fan, an air outlet sampling passage is arranged between a mass flow controller of an air outlet and a laminar flow processing pipeline, the air inlet sampling passage and the air outlet sampling passage share a two-position three-way electromagnetic valve, the air inlet sampling passage is connected with a normally closed port of the shared two-position three-way electromagnetic valve through a diaphragm pump between the air inlet fan and the mass flow controller at the air inlet, the air outlet sampling passage is connected with a normally open port of the shared two-position three-way electromagnetic valve through a diaphragm pump between the mass flow controller at the air outlet and the laminar flow processing pipeline, and therefore the air inlet and the air outlet can be sampled, detected and analyzed on a gas detection passage respectively through controlling the mutual switching of a normally closed end and a normally open end of the shared two-position three-way electromagnetic valve.
The specific operation of respectively detecting the sample gas collected by the air inlet sampling passage and the air outlet sampling passage is that when the normally closed end and the normally open end of the shared two-position three-way electromagnetic valve are not switched with electricity, only the sample gas collected by the diaphragm pump in the air outlet sampling passage can be conveyed downwards through the two-position three-way electromagnetic valve for detection; when the common two-position three-way electromagnetic valve is electrified at the normally closed end and the normally open end, the normally closed end is switched to the normally closed end, so that only sample gas collected by the diaphragm pump in the air inlet sampling passage can be conveyed downwards through the two-position three-way electromagnetic valve for detection, the air inlet sampling passage and the air outlet sampling passage are combined into a detection air passage, and the detection of the air inlet sampling sample and the air outlet sampling sample in a single detection air passage can be realized through the switching of the control electromagnetic valve, so that the air passage analysis is simpler, and the use and maintenance cost is reduced.
Meanwhile, a gas leakage branch with two-position two-way normally open electromagnetic valves is arranged between the diaphragm pumps of the gas inlet sampling passage and the gas outlet sampling passage and the gas paths of the two-position three-way electromagnetic valves in common, and the gas leakage branch can be opened when the gas inlet end of the two-position three-way electromagnetic valves in common is a normally closed end and is used for discharging sample gas collected by the sampling gas paths so as to avoid pressure damage to the pipeline and the two-position three-way electromagnetic valves due to the fact that the gas inlet end of the two-position three-way electromagnetic valves of the gas paths is in a closed state.
In order to detect the gas collected by the air intake sampling passage and the air exhaust sampling passage, as shown in fig. 2, the other normally open end of the two-position three-way electromagnetic valve shared by the air intake sampling passage and the air exhaust sampling passage is connected with the normally open end of a new two-position three-way electromagnetic valve, the other normally open end of the two-position three-way electromagnetic valve is connected with a detection gas passage for detecting the sample gas collected by the air intake sampling passage and the air exhaust sampling passage, the detection gas passage comprises a sample gas conveying detection gas passage and a reference gas conveying detection gas passage, the sample gas conveying detection gas passage comprises a drying pipe connected with the normally open end of the two-position three-way electromagnetic valve shared by the air intake sampling passage and the air exhaust sampling passage, the drying pipe is a resistance heating drying pipe, a temperature and humidity sensor is arranged in the drying pipe, and the output end of the drying pipe is connected with an electronic pressure controller, the input end of the Electronic Pressure Controller (EPC) is connected with the input end of a ruby air resistor, the output end of the ruby air resistor is connected with the input end of a carbon dioxide sensor, the output end of the carbon dioxide sensor is connected with one output end of an oxygen sensor, the output end of the oxygen sensor is communicated with the atmosphere, the reference air conveying detection air path comprises a ruby air resistor, the output end of the ruby air resistor is connected with the input end of an oxygen sensor reference air, the input end of the ruby air resistor is connected with the output end of a new electronic pressure controller, the flow rate of the reference air is controlled to be 200ml/min by matching with the ruby air resistor, the input end of the electronic pressure controller is connected with a gas cylinder of the oxygen sensor reference air, the pipeline between the input end of the electronic pressure controller and the gas cylinder output end of the oxygen sensor reference gas is connected in series with a pressure reducing valve for controlling the gas cylinder output pressure of the oxygen sensor reference gas, the gas detection process of the gas collected by the gas inlet sampling passage and the gas outlet sampling passage is that the collected sample gas is output to the other two-position three-way electromagnetic valve through the shared two-position three-way electromagnetic valve and then is conveyed to the drying pipe through the normally open end of the other two-position three-way electromagnetic valve, the drying pipe is utilized to carry out electric heating, the drying gas in the drying pipe can be heated and dried, the influence of water vapor on detection is reduced, meanwhile, the electronic pressure controller connected with the drying pipe and the ruby gas resistor are mutually matched, the sample gas can be sequentially detected through the carbon dioxide sensor and the oxygen sensor at the flow rate of 100ml/min, the gas cylinder of the oxygen sensor reference gas is synchronously controlled by the pressure reducing valve while the detected gas is conveyed, and the reference gas flows into the oxygen sensor through the mutual matching of the electronic pressure controller and the ruby gas resistor at the flow rate of 200ml/min, so that the sensitivity of the oxygen sensor and the accuracy of the detected gas are ensured, and the gas is discharged to the atmosphere;
in order to ensure the accuracy in the detection gas path and reduce the influence on the detection accuracy due to gas drift in the gas detection process, as shown in fig. 3, a calibration gas path for drift calibration in the gas measurement process and for detecting the accuracy of a calibration gas path is connected to a normally closed port of a two-position three-way electromagnetic valve connected with a two-position three-way electromagnetic valve shared by an intake sampling path and an exhaust sampling path, the calibration gas path comprises a two-position three-way electromagnetic valve connected to a normally closed port of the two-position three-way electromagnetic valve shared by the intake sampling path and the exhaust sampling path, and a calibration gas path for drift calibration in the measurement process is arranged at a normally open end of the two-position three-way electromagnetic valve, and a calibration check gas path for detecting the accuracy of the calibration gas path is arranged at a normally closed end of the two-position three-way electromagnetic valve.
The calibration gas circuit comprises a two-position three-way electromagnetic valve with a normally open port connected with a normally open port of a two-position three-way electromagnetic valve in a calibration gas passage, the other normally open port and the normally closed port of the two-position three-way electromagnetic valve are connected in series with a two-position two-way normally closed electromagnetic valve, a gas cylinder for calibrating gas I is arranged at the input end of the two-position two-way normally closed electromagnetic valve connected with the normally open port of the two-position three-way electromagnetic valve, and a gas cylinder for calibrating gas II is arranged at the input end of the two-position two-way normally closed electromagnetic valve connected with the normally closed port of the two-position three-way electromagnetic valve.
The calibration checking gas circuit comprises a two-position two-way normally closed electromagnetic valve connected with a normally closed port of a two-position three-way electromagnetic valve in the calibration gas passage, a gas cylinder of a calibration gas III is arranged at the input end of the two-position two-way normally closed electromagnetic valve, the gases in the gas cylinder I, the gas cylinder II and the gas cylinder III are all mixed gases of nitrogen, oxygen and carbon dioxide, the proportion of the nitrogen, the oxygen and the carbon dioxide in the gas cylinder I is 79%, 21% and 0%, the proportion of the nitrogen, the oxygen and the carbon dioxide in the gas cylinder II is 75.5%, 19% and 5.5%, and the proportion of the nitrogen, the oxygen and the carbon dioxide in the gas cylinder III is 77.5%, 20% and 2.5%.
The two-position two-way normally closed electromagnetic valve connected with the calibration gas cylinder is electrified firstly in the calibration process of the calibration gas circuit, so that the two-position two-way normally closed electromagnetic valve is in an opened state, and therefore, the gas in the first calibration gas cylinder, namely nitrogen, oxygen and carbon dioxide, is in 79%, 21% and 0% proportion, enters the two-position three-way electromagnetic valve with the next normal open end through the normal open end of the two-position three-way electromagnetic valve connected with the air inlet sampling passage and the air exhaust sampling passage, at the moment, the normal closed end of the two-position three-way electromagnetic valve connected with the two-position three-way electromagnetic valve shared by the air inlet sampling passage and the air exhaust sampling passage is electrified and switched into the normal open state, the two-position two-way normally closed electromagnetic valve on pressure release passages on the pressure release branch of the two-sampling passages is opened, and the gas in the first calibration gas cylinder can enter the detection gas passage to calibrate the carbon dioxide sensor, and whether the calibration is successful or not is confirmed through a computer.
After the gas in the first gas cylinder of the calibration gas is successfully calibrated, the two-position two-way normally-closed electromagnetic valve connected with the first gas cylinder of the calibration gas is closed, the two-position two-way normally-closed electromagnetic valve connected with the second gas cylinder of the calibration gas is opened, the two-position three-way electromagnetic valve connected with the two-position two-way normally-closed electromagnetic valve is switched, the normally-closed end is opened, the normally-open end connected with the first gas cylinder of the calibration gas is closed, so that the gas with the ratio of 75.5 percent of nitrogen, 19 percent of oxygen and 5.5 percent of carbon dioxide in the second gas cylinder of the calibration gas can enter a detection gas passage to calibrate the carbon dioxide sensor, and whether the calibration is successful is confirmed through a computer.
After the gas in the second gas cylinder of the calibration gas is calibrated successfully, the two-position two-way normally-closed electromagnetic valve connected with the second gas cylinder of the calibration gas is closed, the two-position two-way normally-closed electromagnetic valve connected with the third gas cylinder of the calibration gas is opened, and the two-position three-way electromagnetic valve connected with the two-position two-way normally-closed electromagnetic valve is switched, so that the gas with the ratio of 77.5 percent, 20 percent and 2.5 percent of nitrogen, oxygen and carbon dioxide in the third gas cylinder of the calibration gas can enter a detection gas passage to be detected, and the accuracy of gas concentration detection is improved by determining whether the detection value is consistent with the data fed into the third gas cylinder of the calibration gas or not, so as to determine the accuracy of the calibration of the previous two times and calibrate the detection gas passage by using the calibration gases with three different contents of nitrogen, oxygen and carbon dioxide;
in order to reduce the waste of sample gas in exhaust gas and shorten the detection time of detection personnel in a metabolism cabin, as shown in fig. 1, a fan for gas circulation is arranged between an air inlet and an air outlet, the input end of the fan for gas circulation is arranged between an air outlet and a mass flow controller at the air outlet through a corrugated hose, the output end of the fan for gas circulation is arranged between the air inlet and the mass flow controller at the air inlet through a corrugated hose, the flow rate of the fan for circulation between the air inlet is 30-40L/min, part of gas in an exhaust gas pipeline can be returned to the air inlet again under the action of the circulating fan, and then is conveyed to the inside of a cabin body through the air inlet for circulation detection, so that the waste of the gas is reduced, the time of human body in the metabolism cabin is shortened, an inner cavity of the metabolism cabin body is provided with air conditioning equipment for mixed gas, the circulation flow rate of the air conditioning equipment is 19000L/min, the control temperature is 25+/-0.5 ℃, the side wall of the outside of the cabin body is provided with an atmospheric pressure sensor, the atmospheric pressure sensor for monitoring the atmospheric pressure outside the cabin body is arranged on the air inlet, the atmospheric pressure sensor is arranged on the outside the cabin body, and the atmospheric pressure sensor is arranged outside the cabin body, and the differential pressure sensor is combined with the atmospheric pressure sensor.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. The utility model provides a medical treatment metabolism cabin high accuracy analysis gas circuit system, is including the metabolism cabin body that has air inlet and gas vent, and is connected with the air inlet fan that is used for admitting air through mass flow controller in air inlet department, is connected with the exhaust fan that is used for the exhaust through mass flow controller in gas vent department, and is provided with laminar flow treatment pipeline, its characterized in that between mass flow controller and the exhaust fan of gas vent department: an air inlet sampling passage is arranged between the mass flow controller of the air inlet and the air inlet fan, and an exhaust sampling passage is arranged between the mass flow controller of the air outlet and the laminar flow treatment pipeline;
a fan for gas circulation is arranged between the air inlet and the air outlet, the input end of the fan for gas circulation is arranged between the air outlet and the mass flow controller at the air outlet through a corrugated hose, and the output end of the fan for gas circulation is arranged between the air inlet and the mass flow controller at the air inlet through a corrugated hose;
the air inlet sampling passage is formed by connecting a diaphragm pump arranged between an air inlet fan and mass flow control at an air inlet and a normally closed port of a two-position three-way electromagnetic valve, and an air leakage branch with a two-position two-way normally open electromagnetic valve is arranged between the diaphragm pump and an air passage of the two-position three-way electromagnetic valve; the exhaust sampling passage is formed by connecting a diaphragm pump arranged between a mass flow controller at an exhaust port and a laminar flow treatment pipeline with a normally open port of a two-position three-way electromagnetic valve in an intake sampling passage, and a gas leakage branch with a two-position two-way normally closed electromagnetic valve is arranged between the diaphragm pump and a gas path of the two-position three-way electromagnetic valve;
the other normally open end of the two-position three-way electromagnetic valve shared by the air inlet sampling passage and the air exhaust sampling passage is connected with a normally open port of the other two-position three-way electromagnetic valve, the normally closed port of the two-position three-way electromagnetic valve is connected with a calibration gas passage for drift calibration and measurement and initial value recovery in the gas measurement process, and the other normally open port of the two-position three-way electromagnetic valve is connected with a detection gas passage for detecting sample gas collected by the air inlet sampling passage and the air exhaust sampling passage.
2. The medical treatment metabolic compartment high accuracy analysis gas circuit system according to claim 1, wherein: the detection gas passage comprises a sample gas conveying detection gas passage and a reference gas conveying detection gas passage, the sample gas conveying detection gas passage comprises a drying pipe connected with a normally open port of a two-position three-way electromagnetic valve which is connected with the two-position three-way electromagnetic valve shared by the air inlet sampling passage and the air outlet sampling passage, the output end of the drying pipe is connected with the input end of an electronic pressure controller, the output end of the electronic pressure controller is connected with the input end of a ruby air resistor, the output end of the ruby air resistor is connected with the input end of a carbon dioxide sensor, the output end of the carbon dioxide sensor is connected with one output end of an oxygen sensor, and the output end of the oxygen sensor is communicated with the atmosphere;
the reference gas conveying detection gas circuit comprises a ruby gas resistor, the output end of which is connected with the input end of the oxygen sensor reference gas, the input end of the ruby gas resistor is connected with the output end of another electronic pressure controller, the input end of the electronic pressure controller is connected with a gas cylinder of the oxygen sensor reference gas, and a pressure reducing valve for controlling the output pressure of the gas cylinder of the oxygen sensor reference gas is connected in series with a pipeline between the input end of the electronic pressure controller and the output end of the gas cylinder of the oxygen sensor reference gas.
3. The medical treatment metabolic compartment high accuracy analysis gas circuit system according to claim 1, wherein: the calibration gas passage comprises a two-position three-way electromagnetic valve connected with a normally closed port of the two-position three-way electromagnetic valve which is connected with the two-position three-way electromagnetic valve in common, a calibration gas passage for drift calibration in the measurement process is arranged at a normally open end of the two-position three-way electromagnetic valve, and a calibration check gas passage for detecting the accuracy of the calibration gas passage is arranged at the normally closed end of the two-position three-way electromagnetic valve;
the calibration gas circuit comprises a two-position three-way electromagnetic valve with a normally open port connected with a normally open port of a two-position three-way electromagnetic valve in a calibration gas passage, the other normally open port and the normally closed port of the two-position three-way electromagnetic valve are connected in series with a two-position two-way normally closed electromagnetic valve, a gas cylinder for calibrating gas I is arranged at the input end of the two-position two-way normally closed electromagnetic valve connected with the normally open port of the two-position three-way electromagnetic valve, and a gas cylinder for calibrating gas II is arranged at the input end of the two-position two-way normally closed electromagnetic valve connected with the normally closed port of the two-position three-way electromagnetic valve;
the calibration checking gas circuit comprises a two-position two-way normally closed electromagnetic valve connected with a normally closed port of the two-position three-way electromagnetic valve in the calibration gas passage, and a gas cylinder for the third calibration gas is arranged at the input end of the two-position two-way normally closed electromagnetic valve.
4. A medical treatment metabolic compartment high accuracy analysis gas circuit system according to claim 3, wherein: the gas in the first gas cylinder, the second gas cylinder and the third gas cylinder of the calibration gas are all mixed gases of nitrogen, oxygen and carbon dioxide, the proportion of the nitrogen, the oxygen and the carbon dioxide in the first gas cylinder of the calibration gas is 79%, 21% and 0%, the proportion of the nitrogen, the oxygen and the carbon dioxide in the second gas cylinder of the calibration gas is 75.5%, 19% and 5.5%, and the proportion of the nitrogen, the oxygen and the carbon dioxide in the third gas cylinder of the calibration gas is 77.5%, 20% and 2.5%.
5. The medical treatment metabolic compartment high accuracy analysis gas circuit system according to claim 1, wherein: the type and the power of the air inlet fan at the air inlet, the type and the power of the air outlet fan at the air outlet and the type and the power of the fan used for circulation between the air outlet and the air inlet are the same, the type and the power of the air inlet fan at the air inlet and the type and the power of the air outlet fan used for circulation between the air outlet and the air inlet are 24V direct current brushless fans, the flow rates of the air inlet fan at the air inlet and the air outlet fan are 100L/min, and the flow rate of the fan used for circulation between the air outlet and the air inlet is 30-40L/min.
6. The medical treatment metabolic compartment high accuracy analysis gas circuit system according to claim 1, wherein: the laminar flow treatment pipeline is a pipeline with a honeycomb-shaped gas channel inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223541968.4U CN219285132U (en) | 2022-12-29 | 2022-12-29 | High-precision analysis gas circuit system for medical metabolic cabin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223541968.4U CN219285132U (en) | 2022-12-29 | 2022-12-29 | High-precision analysis gas circuit system for medical metabolic cabin |
Publications (1)
| Publication Number | Publication Date |
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| CN219285132U true CN219285132U (en) | 2023-06-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116878971A (en) * | 2023-07-11 | 2023-10-13 | 中国农业大学 | Human energy metabolism bin |
| CN117091915A (en) * | 2023-07-11 | 2023-11-21 | 中国农业大学 | Gas generating device for human energy metabolism and standard gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116878971A (en) * | 2023-07-11 | 2023-10-13 | 中国农业大学 | Human energy metabolism bin |
| CN117091915A (en) * | 2023-07-11 | 2023-11-21 | 中国农业大学 | Gas generating device for human energy metabolism and standard gas |
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