CN113805616A - Gas concentration adjusting device - Google Patents
Gas concentration adjusting device Download PDFInfo
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- CN113805616A CN113805616A CN202111162933.7A CN202111162933A CN113805616A CN 113805616 A CN113805616 A CN 113805616A CN 202111162933 A CN202111162933 A CN 202111162933A CN 113805616 A CN113805616 A CN 113805616A
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- module
- gas
- operational amplifier
- voltage
- gas concentration
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- 238000001514 detection method Methods 0.000 claims abstract description 67
- 230000001105 regulatory effect Effects 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims description 140
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000007781 pre-processing Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 20
- 229910002092 carbon dioxide Inorganic materials 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 206010061218 Inflammation Diseases 0.000 description 4
- 230000004054 inflammatory process Effects 0.000 description 4
- 230000029058 respiratory gaseous exchange Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002327 eosinophilic effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
Abstract
The embodiment of the invention discloses a gas concentration adjusting device, which comprises: the gas concentration detection module is used for detecting the concentration of the mixed gas and outputting corresponding detection voltage; the control module is connected with the gas concentration detection module, compares the detection voltage with a preset voltage and controls the opening of the flow regulation module according to the comparison result; the flow regulating module changes the opening degree of the flow regulating module so as to regulate the flow of the gas output by each gas container; the gas container outputs different gas flows and different concentrations of the mixed gas. By adopting the device, the demand for storing the gas container for calibrating the concentration is reduced, the gas with the calibrated concentration can be provided for the equipment to be tested only by a small number of gas containers, the cost is reduced, the calibration process is simplified, and the calibration efficiency of the equipment to be tested is improved.
Description
Technical Field
The invention relates to the technical field of gas concentration regulation, in particular to a gas concentration regulating device.
Background
The increasing state of the art in electronics and mechanics has led to the development of medical devices, where the monitoring of respiratory gases is becoming more and more important, such as ventilators, monitors, etc. Before a breathing machine and a monitor are put into use, the equipment needs to be calibrated by using gases with different known concentrations, and the more the calibration concentration values are, the more accurate the measurement is, the more standard gas containers corresponding to different calibration concentrations are needed to provide the gases with the calibration concentrations for the equipment, however, the more the gas containers are, the more the calibration process is complicated, and the higher the cost is.
Disclosure of Invention
In view of the above, it is necessary to provide a gas concentration adjustment device.
A gas concentration adjustment device comprising:
the gas concentration detection module is used for detecting the concentration of the mixed gas and outputting corresponding detection voltage; the mixed gas is formed by mixing respective gases in a plurality of gas containers;
the control module is connected with the gas concentration detection module and used for comparing the detection voltage with a preset voltage and controlling the opening of the flow regulation module according to a comparison result; and
the flow regulating module is used for changing the opening degree of the flow regulating module so as to regulate the flow of the gas output by each gas container; the gas container outputs different gas flows, and the mixed gas has different concentrations.
In one embodiment, the flow regulating module is a proportional valve or an electrically-operated regulating valve; each proportional valve or electric regulating valve is connected with one gas container so as to regulate the flow of the gas output by the gas container according to the opening degree of the proportional valve or the electric regulating valve.
In one embodiment, the control module comprises a single chip microcomputer; the detection voltage is input to an ADC (analog to digital converter) interface of the singlechip; and the comparison result is output by a DAC interface or a PWM interface of the singlechip.
In one embodiment, the control module further comprises an AD conversion module connected with the single chip microcomputer; and the AD conversion module is used for performing analog-to-digital conversion on the detection voltage and then inputting the detection voltage to the single chip microcomputer.
In one embodiment, the control module comprises:
and the preprocessing module is connected with the gas concentration detection module and the flow regulation module and used for calculating and outputting current for controlling the opening degree of the flow regulation module according to the accessed detection voltage, the preset voltage and the internal resistance of the preprocessing module so as to regulate the flow of the gas output by each gas container.
In one embodiment, the control module further comprises:
the single chip microcomputer is connected with the preprocessing module and used for providing the preset voltage;
the current value applied to the flow regulating module by the preprocessing module is the quotient of the differential pressure of the preset voltage and the detection voltage and the internal resistance of the preprocessing module.
In one embodiment, the gas concentration detection module is a gas analyzer;
the preprocessing module comprises:
the voltage output module is connected with the single chip microcomputer and the gas concentration detection module and used for calculating and outputting a differential pressure between the detection voltage and a preset voltage;
and the current output module is connected with the voltage output module, is accessed to the differential pressure, and applies current to the flow regulating module according to the differential pressure and the internal resistance of the current output module.
In one embodiment, the voltage output module includes:
the first filter circuit is connected with the gas concentration detection module and is used for filtering detection voltage applied by the connected gas concentration detection module;
the second filter circuit is connected with the singlechip and is used for filtering preset voltage applied to the accessed singlechip block;
and the differential operation amplifying circuit is connected with the second filter circuit and the first filter circuit and is used for calculating the differential pressure between the filtered detection voltage and the preset voltage, amplifying the differential pressure and applying the amplified differential pressure to the current output module.
In one embodiment, the first filter circuit includes: a first capacitor, a second capacitor and a first operational amplifier;
the second filter circuit includes: a third capacitor, a fourth capacitor and a second operational amplifier;
the differential operational amplifier circuit is a third operational amplifier;
the first end of the first capacitor is connected to the detection voltage, and the second end of the first capacitor is grounded;
the first end of the second capacitor is connected to the detection voltage, and the second end of the second capacitor is grounded;
the non-inverting input end of the first operational amplifier is connected with the detection voltage, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the inverting input end of the third operational amplifier;
the first end of the third capacitor is connected to the preset voltage, and the second end of the third capacitor is grounded;
a first end of the fourth capacitor is connected to the preset voltage, and a second end of the fourth capacitor is grounded;
the non-inverting input end of the second operational amplifier is connected with the preset voltage, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the non-inverting input end of the third operational amplifier;
and the output end of the third operational amplifier is connected with the input end of the current output module.
In one embodiment, the current output module includes: the fourth operational amplifier, the fifth operational amplifier, the MOS tube and the resistor;
the non-inverting input end of the fourth operational amplifier is connected with the differential pressure, the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is connected with the non-inverting input end of the fifth operational amplifier;
the inverting input end of the fifth operational amplifier is connected with the source electrode of the MOS tube, and the output end of the fifth operational amplifier is connected with the drain electrode of the MOS tube;
the grid electrode of the MOS tube is connected with a programming voltage;
and the first end of the resistor is connected with the inverting input end of the fifth operational amplifier, and the second end of the resistor is grounded.
And the anode of the flow regulating module is connected with the programming voltage, and the cathode of the flow regulating module is connected with the grid of the MOS tube.
The embodiment of the invention has the following beneficial effects:
this application adopts gas concentration detection module to carry out concentration detection to current gas, and feed back the voltage value that this concentration corresponds to control module, control module controls the defeated aperture of flow control module according to this voltage value, so that the gas container of the different gas concentration of storage exports respective gas and mixes, obtain the gas that preset gas concentration corresponds, the demand of the gas container to the gas of storage calibration concentration has been reduced, only through a small number of gas container alright realize providing the gas of demarcation concentration to the equipment that awaits measuring, the cost is reduced, the process of demarcation has been simplified, the efficiency of demarcation to the equipment that awaits measuring has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram showing the structure of a gas concentration adjusting apparatus according to an embodiment;
FIG. 2 is a block diagram showing the construction of a gas concentration adjusting apparatus according to another embodiment;
FIG. 3 is a circuit diagram of a voltage output module of the gas concentration regulating device in one embodiment;
FIG. 4 is a circuit diagram of a current output module of the gas concentration regulating device in one embodiment.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a gas concentration regulating device, which is applied to equipment such as a breathing machine and a monitor which need to monitor breathing gas, wherein before the breathing machine and the monitor are put into use, various gases with known concentrations are needed to calibrate the equipment to be tested, so that the gas concentration regulating device provided by the application can be used for regulating the flow of a gas container for providing gas for the equipment, and gas containers respectively storing gases with different concentrations are not needed to be arranged to output the gases with single concentration in sequence; only a few gas containers with certain concentration of gas are needed to provide the gas with different calibration concentrations to the device to be tested, wherein the calibration concentrations refer to: taking the detection of the concentration of carbon dioxide in the exhaled gas of a person as an example, the device to be tested judges the eosinophilic inflammation and the like of the airway according to the concentration of carbon dioxide in the detected gas, different concentrations of carbon dioxide represent different inflammation degrees, and then the calibration concentration is different concentrations of carbon dioxide corresponding to the inflammations of different degrees, and the concentration of carbon dioxide in the exhaled gas of the person is detected, so that the corresponding inflammation degree can be judged.
Fig. 1 is a block diagram showing a gas concentration adjusting apparatus according to an embodiment. Referring to fig. 1, includes: a gas concentration detection module 30 for detecting the concentration of the mixed gas and outputting a corresponding detection voltage; the mixed gas is formed by mixing respective gases in a plurality of gas containers;
the control module 20 is connected with the gas concentration detection module 30 and is used for comparing the detection voltage with a preset voltage and controlling the opening of the flow regulation module 10 according to the comparison result; and
a flow regulating module 10; the gas container is used for changing the opening degree of the gas container to adjust the flow rate of the gas output by each gas container; the gas container outputs different gas flows, and the mixed gas has different concentrations.
Specifically, taking the example of setting two gases with different carbon dioxide concentrations, the two gases are respectively stored in two gas containers, each gas container is controlled by a gas valve to be switched, and then the flow of the output gas is controlled by a flow regulating module, wherein the flow regulating module is a proportional valve or an electric regulating valve; after the gas valve is opened, the upper computer 50 writes in the concentration of the preset gas (the concentration of the preset gas is also referred to as the above calibration concentration) which needs to be provided for the device to be tested into the control module, the control module controls the opening degree of the flow regulating module according to the preset voltage corresponding to the preset gas concentration to realize that the gas with the preset concentration is provided for the device to be tested, the gas concentration detecting module detects the concentration of carbon dioxide in the mixed gas and feeds back the corresponding detecting voltage to the control module, the control module compares the detecting voltage with the preset voltage, if the detecting voltage concentration is higher, the flow regulating module corresponding to the gas container with lower carbon dioxide concentration is controlled to reduce the opening degree, and the flow regulating module corresponding to the gas container with higher carbon dioxide concentration is controlled to increase the opening degree (the regulating process of the part is not the content to be protected in the present application, and therefore not described in detail) to achieve a predetermined gas concentration to the device under test.
As shown in fig. 2, the control module 20 includes: the device comprises a singlechip and an AD conversion module connected with the singlechip; the detection voltage corresponding to the concentration of the carbon dioxide in the mixed gas detected by the gas concentration detection module is subjected to analog-to-digital conversion by the AD conversion module and then is input to the single chip microcomputer through an ADC interface of the single chip microcomputer; and outputting the voltage which corresponds to the comparison result and is used for controlling the flow regulation module to the flow regulation module through a DAC interface or a PWM interface of the single chip microcomputer, wherein the flow regulation module is a gas analyzer or other instruments capable of analyzing the concentration of the specific gas in the gas.
In one embodiment, the control module 20 includes: a preprocessing module 22 and a single chip microcomputer 21; the preprocessing module 22 is connected to the gas concentration detecting module 30 and the flow regulating module 20, and is configured to calculate and output a current for controlling an opening of the flow regulating module 20 according to the accessed detection voltage, the preset voltage, and an internal resistance of the preprocessing module, so as to regulate a flow of the gas output by each gas container. Wherein the current value applied to the flow rate adjusting module 20 by the preprocessing module 22 is the quotient of the differential pressure between the preset voltage and the detection voltage and the internal resistance of the preprocessing module 22.
On the basis of the above embodiment, the preprocessing module 22 includes:
a voltage output module 221, connected to the single chip microcomputer 21 and the gas concentration detection module 30, for accessing a detection voltage applied by the gas concentration detection module 30 and a preset voltage applied by the single chip microcomputer 21, and calculating a differential pressure between the detection voltage and the preset voltage;
and a current output module 222 connected to the voltage output module 221, for inputting the differential pressure, and determining the current applied to the flow rate adjusting module 20 according to the differential pressure and the internal resistance of the current output module 222.
On the basis of the above embodiment, the voltage output module 221 includes:
a first filter circuit 2211 connected to the gas concentration detection module 30 for filtering a detection voltage applied by the gas concentration detection module 30; as shown in fig. 3, the first filter circuit 2211 includes: a first capacitor C11, a second capacitor C10, and a first operational amplifier U1B; the first end of the first capacitor C11 is connected to the detection voltage, and the second end is grounded; the first end of the second capacitor C10 is connected to the detection voltage, and the second end is grounded; the non-inverting input end of the first operational amplifier U1B is connected to the detection voltage, the inverting input end is connected to the output end, and the output end is connected to the inverting input end of the third operational amplifier U4B.
The second filter circuit 2212 is connected with the single chip microcomputer 21 and is used for filtering preset voltage applied to the accessed single chip microcomputer 21; the second filter circuit 2212 includes: a third capacitor C1, a fourth capacitor C2, and a second operational amplifier U1A; a first end of the third capacitor C1 is connected to the preset voltage, and a second end is grounded; a first end of the fourth capacitor C2 is connected to the preset voltage, and a second end of the fourth capacitor C2 is grounded; the non-inverting input end of the second operational amplifier U1A is connected to the preset voltage, the inverting input end is connected to the output end, and the output end is connected to the non-inverting input end of the third operational amplifier U4B.
And a differential operational amplifier 2213 connected to the second filter circuit 2212 and the first filter circuit 2211, and configured to calculate a differential pressure between the filtered detected voltage and a preset voltage, amplify the differential pressure, and apply the amplified differential pressure to the current output module 222. The differential operational amplifier circuit 2213 is a third operational amplifier U4B, and an output terminal of the third operational amplifier is connected to an input terminal of the current output module 222.
Wherein, the detection voltage sent by the gas concentration detection module 30 is filtered by the first filter circuit 2211 and then input to the inverting input terminal of the third operational amplifier U4B of the differential operational amplifier circuit 2213; the preset voltage sent by the single chip microcomputer 21 is filtered by the second filter circuit 2212 and then input to the non-inverting input terminal of the third operational amplifier U4B of the differential operational amplifier circuit 2213; the third operational amplifier U4B performs a differential operation on the detection voltage and the preset voltage, and outputs the calculated differential pressure to the current output module 222.
In one embodiment, the current output module 222 is a constant current source, as shown in fig. 4, and includes: the fourth operational amplifier U5B, the fifth operational amplifier U6B, the MOS transistor Q1 and the resistor R13; the fourth operational amplifier U5B is a voltage follower, the non-inverting input end of which is connected to the differential pressure, the inverting input end of which is connected to the output end, and the output end of which is connected to the non-inverting input end of the fifth operational amplifier U6B; the inverting input end of the fifth operational amplifier U6B is connected with the source electrode of the MOS transistor Q1, and the output end of the fifth operational amplifier U6B is connected with the drain electrode of the MOS transistor Q1; the gate of the MOS tube Q1 is connected with a programming voltage; the first end of the resistor R13 is connected with the inverting input end of the fifth operational amplifier U6B, and the second end is grounded; the anode of the flow regulating module is connected with the programming voltage, and the cathode of the flow regulating module is connected with the grid of the MOS transistor Q1.
The fourth operational amplifier U5B is a voltage follower, and plays roles of buffering, isolating, and improving a load capacity, the fourth operational amplifier U5B is connected to the differential pressure, voltages at a non-inverting input end and an inverting input end of the fifth operational amplifier U6B are both the differential pressure, since an internal resistance of the current output module 222 is a resistance value of the resistor R13, a current flowing into the MOS transistor Q1 is a quotient of the differential pressure and a resistance value of the resistor R13, since the proportional valve or the electric control valve is connected to the current output module 222, the current is applied to the proportional valve or the electric control valve, and the proportional valve or the electric control valve realizes a corresponding opening according to the current, so as to adjust a flow rate of gas output by each gas container, and achieve a gas concentration corresponding to the preset voltage.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A gas concentration adjustment device characterized by comprising:
the gas concentration detection module is used for detecting the concentration of the mixed gas and outputting corresponding detection voltage; the mixed gas is formed by mixing respective gases in a plurality of gas containers;
the control module is connected with the gas concentration detection module and used for comparing the detection voltage with a preset voltage and controlling the opening of the flow regulation module according to a comparison result; and
the flow regulating module is used for changing the opening degree of the flow regulating module so as to regulate the flow of the gas output by each gas container; the gas container outputs different gas flows, and the mixed gas has different concentrations.
2. The gas concentration regulating device according to claim 1, wherein the flow regulating module is a proportional valve or an electric regulating valve; each proportional valve or electric regulating valve is connected with one gas container so as to regulate the flow of the gas output by the gas container according to the opening degree of the proportional valve or the electric regulating valve.
3. The gas concentration regulating device of claim 1, wherein the control module comprises a single-chip microcomputer; the detection voltage is input to an ADC (analog to digital converter) interface of the singlechip; and the comparison result is output by a DAC interface or a PWM interface of the singlechip.
4. The gas concentration regulating device according to claim 3, wherein the control module further comprises an AD conversion module connected with the single chip microcomputer; and the AD conversion module is used for performing analog-to-digital conversion on the detection voltage and then inputting the detection voltage to the single chip microcomputer.
5. The gas concentration adjustment device of claim 1, wherein the control module comprises:
and the preprocessing module is connected with the gas concentration detection module and the flow regulation module and used for calculating and outputting current for controlling the opening degree of the flow regulation module according to the accessed detection voltage, the preset voltage and the internal resistance of the preprocessing module so as to regulate the flow of the gas output by each gas container.
6. The gas concentration adjustment device of claim 5, wherein the control module further comprises:
the single chip microcomputer is connected with the preprocessing module and used for providing the preset voltage;
the current value applied to the flow regulating module by the preprocessing module is the quotient of the differential pressure of the preset voltage and the detection voltage and the internal resistance of the preprocessing module.
7. The gas concentration regulating device according to claim 6, wherein the gas concentration detecting module is a gas analyzer;
the preprocessing module comprises:
the voltage output module is connected with the single chip microcomputer and the gas concentration detection module and used for calculating and outputting a differential pressure between the detection voltage and a preset voltage;
and the current output module is connected with the voltage output module, is accessed to the differential pressure, and applies current to the flow regulating module according to the differential pressure and the internal resistance of the current output module.
8. The gas concentration adjustment apparatus according to claim 7,
the voltage output module includes:
the first filter circuit is connected with the gas concentration detection module and is used for filtering detection voltage applied by the connected gas concentration detection module;
the second filter circuit is connected with the singlechip and is used for filtering preset voltage applied to the accessed singlechip block;
and the differential operation amplifying circuit is connected with the second filter circuit and the first filter circuit and is used for calculating the differential pressure between the filtered detection voltage and the preset voltage, amplifying the differential pressure and applying the amplified differential pressure to the current output module.
9. The gas concentration adjustment apparatus according to claim 8,
the first filter circuit includes: a first capacitor, a second capacitor and a first operational amplifier;
the second filter circuit includes: a third capacitor, a fourth capacitor and a second operational amplifier;
the differential operational amplifier circuit is a third operational amplifier;
the first end of the first capacitor is connected to the detection voltage, and the second end of the first capacitor is grounded;
the first end of the second capacitor is connected to the detection voltage, and the second end of the second capacitor is grounded;
the non-inverting input end of the first operational amplifier is connected with the detection voltage, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the inverting input end of the third operational amplifier;
the first end of the third capacitor is connected to the preset voltage, and the second end of the third capacitor is grounded;
a first end of the fourth capacitor is connected to the preset voltage, and a second end of the fourth capacitor is grounded;
the non-inverting input end of the second operational amplifier is connected with the preset voltage, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the non-inverting input end of the third operational amplifier;
and the output end of the third operational amplifier is connected with the input end of the current output module.
10. The gas concentration adjustment apparatus according to claim 7,
the current output module includes: the fourth operational amplifier, the fifth operational amplifier, the MOS tube and the resistor;
the non-inverting input end of the fourth operational amplifier is connected with the differential pressure, the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is connected with the non-inverting input end of the fifth operational amplifier;
the inverting input end of the fifth operational amplifier is connected with the source electrode of the MOS tube, and the output end of the fifth operational amplifier is connected with the drain electrode of the MOS tube;
the grid electrode of the MOS tube is connected with a programming voltage;
the first end of the resistor is connected with the inverting input end of the fifth operational amplifier, and the second end of the resistor is grounded;
and the anode of the flow regulating module is connected with the programming voltage, and the cathode of the flow regulating module is connected with the grid of the MOS tube.
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| CN202111162933.7A CN113805616A (en) | 2021-09-30 | 2021-09-30 | Gas concentration adjusting device |
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