CN114235511B - Volumetric carbon dioxide collection device and volumetric carbon dioxide collection method - Google Patents
Volumetric carbon dioxide collection device and volumetric carbon dioxide collection method Download PDFInfo
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- CN114235511B CN114235511B CN202111552348.8A CN202111552348A CN114235511B CN 114235511 B CN114235511 B CN 114235511B CN 202111552348 A CN202111552348 A CN 202111552348A CN 114235511 B CN114235511 B CN 114235511B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The present disclosure provides a volumetric carbon dioxide collection device and volumetric carbon dioxide collection method, the method comprising: the air inlet is arranged at the first side of the collecting pipeline and is used for sending the test gas exhaled by the target object into the collecting pipeline; the throttling assembly is fixed in the collecting pipeline and is used for generating pressure difference of the test gas; the gas outlet is arranged at the second side of the collecting pipeline and is used for outputting the test gas to the collecting pipeline; the first sampling assembly is arranged between the throttling assembly and the air inlet and is close to the throttling assembly; the second sampling assembly is arranged between the throttling assembly and the air outlet and is close to the throttling assembly; and the carbon dioxide acquisition assembly is arranged between the air outlet and the second sampling assembly.
Description
Technical Field
The disclosure relates to medical equipment, in particular to the field of physiological signal detection, and particularly relates to a volumetric carbon dioxide acquisition device and a volumetric carbon dioxide acquisition method.
Background
Currently, respiratory diseases are highly prevalent, and common pulmonary diseases include Chronic Obstructive Pulmonary Disease (COPD), asthma, and the like. For the treatment of chronic obstructive pulmonary disease, daily monitoring and accurate grading is required. Lung function examination is the main means of disease classification, however, the test standard of lung function examination is very strict, the quality control efficiency is low, and there is a limitation in measurement. Research shows that the volume carbon dioxide diagram related index of the target object has correlation with the disease level of the COPD, and accurate grading of the disease level of the COPD can be realized through monitoring the volume carbon dioxide diagram, so that daily monitoring and early warning of diseases such as the COPD can be carried out. However, the current market lacks a system suitable for daily volumetric carbon dioxide monitoring and recording by the target subject at home.
The main parameters of volumetric carbon dioxide monitoring are the concentration of carbon dioxide in the exhaled gas of the target object and the volume of the exhaled gas. Currently, a pumping method is generally used to measure the carbon dioxide concentration of the exhaled air, and a suction pump is used to pump carbon dioxide into a gas chamber of a sensor at a certain flow rate to detect the carbon dioxide concentration. However, the detection of carbon dioxide concentration has high demands on the flow control of the extraction pump.
If the air extraction flow is greater than the flow of the air exhaled by the human body, the air in the air is pumped into the air chamber of the sensor, so that the concentration of carbon dioxide is lower. If the air extraction flow is smaller than the flow of the air exhaled by the human body, the air in the air chamber cannot be sufficiently updated in time, the response time of the carbon dioxide concentration is too long, the concentration detection error is caused, and even an exhalation platform cannot be observed in a carbon dioxide oscillogram.
Disclosure of Invention
In view of the foregoing, it is a primary object of the present disclosure to provide a volumetric carbon dioxide collection device and a volumetric carbon dioxide collection method, so as to at least partially solve at least one of the above-mentioned technical problems.
To achieve the above object, as an embodiment of the first aspect of the present disclosure, there is provided a volumetric carbon dioxide collection device including: the air inlet is arranged at the first side of the collecting pipeline and is used for sending the test gas exhaled by the target object into the collecting pipeline; the throttling assembly is fixed in the collecting pipeline and is used for generating pressure difference of the test gas; the gas outlet is arranged at the second side of the collecting pipeline and is used for outputting the test gas to the collecting pipeline; the first sampling assembly is arranged between the throttling assembly and the air inlet and is close to the throttling assembly; the second sampling assembly is arranged between the throttling assembly and the air outlet and is close to the throttling assembly; and the carbon dioxide acquisition assembly is arranged between the air outlet and the second sampling assembly.
According to an embodiment of the present disclosure, the system further comprises a volumetric carbon dioxide detection device, wherein the carbon dioxide detection device comprises a carbon dioxide collection chamber, an air pump, a first collection tube and a second collection tube; the carbon dioxide collection chamber is connected to the carbon dioxide collection assembly through a first collection pipe and is used for detecting the carbon dioxide concentration of the test gas; and an air pump connected to the carbon dioxide collection chamber through a second collection tube for extracting the test gas from the carbon dioxide collection assembly into the carbon dioxide collection chamber.
According to an embodiment of the disclosure, the device further comprises a controller for outputting a preset sampling flow, and the air pump is used for extracting the test gas according to the preset sampling flow.
According to an embodiment of the present disclosure, the device further comprises a pressure difference detection device connected to the first sampling assembly through a third collection tube and connected to the second sampling assembly through a fourth collection tube for detecting a gas pressure difference of the test gas passing through the throttling assembly.
According to an embodiment of the present disclosure, the device further comprises a handheld housing disposed below the collection tube for supporting the collection tube.
According to the embodiment of the disclosure, the portable carbon dioxide collection device further comprises a key assembly and an indication assembly, wherein the key assembly is arranged on the side surface of the handheld shell and is used for opening or closing the volumetric carbon dioxide collection device; the indicating assembly is arranged on the side face of the handheld shell, and is used for indicating a tester to perform acquisition operation after the machine is started through the key assembly.
According to the embodiment of the disclosure, the device further comprises a temperature detection assembly, a heating assembly and an air hole array, wherein the temperature detection assembly is arranged in the handheld shell and is used for detecting the temperature of the volumetric carbon dioxide acquisition device; the heating component is attached to the inside of the handheld shell and is used for maintaining the temperature of the volumetric carbon dioxide collection device; the air hole array is arranged on the side surface of the handheld shell and is used for exhausting and radiating the volumetric carbon dioxide acquisition device; the temperature detection assembly detects the temperature of the volume carbon dioxide collection device, and when the temperature of the volume carbon dioxide collection device does not meet the preset condition, the heating assembly is used for heating the volume carbon dioxide collection device, and the air hole array is used for exhausting and radiating the volume carbon dioxide collection device.
As an embodiment of the second aspect of the present disclosure, there is provided a carbon dioxide collection method applied to the above-mentioned volumetric carbon dioxide collection device, including: the air inlet sends the test gas exhaled by the tester into the collection pipeline; the throttling assembly generates a pressure difference of the test gas; the gas outlet outputs the test gas to the acquisition pipeline; the first acquisition component acquires the gas pressure of the test gas before entering the throttling component; the second sampling assembly collects the gas pressure of the test gas after passing through the throttling assembly; and the carbon dioxide collection component collects the carbon dioxide concentration of the test gas by controlling the collection flow.
According to an embodiment of the disclosure, wherein the controller outputs a preset sampling flow; the air pump extracts the test gas according to a preset sampling flow.
According to an embodiment of the present disclosure, wherein the controller outputting the preset sampling flow rate includes: the controller outputs a preset sampling flow by using an adaptive adjustment algorithm.
Drawings
FIG. 1 schematically illustrates an internal block diagram of a collection conduit according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates an internal block diagram of a volumetric carbon dioxide collection device according to an embodiment of the disclosure;
FIG. 3 schematically illustrates a front view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure;
FIG. 4 schematically illustrates a left side view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure;
FIG. 5 schematically illustrates a rear view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure;
FIG. 6 schematically illustrates a top view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure;
FIG. 7 schematically illustrates a flow chart of a carbon dioxide capture method according to another embodiment of the present disclosure;
fig. 8 schematically illustrates a flow chart for controlling an extraction pump according to another embodiment of the present disclosure.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. Various structural schematic diagrams according to embodiments of the present application are shown in the accompanying drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted.
According to the present general inventive concept, there is provided a volumetric carbon dioxide collection device, comprising: the air inlet is arranged at the first side of the collecting pipeline and is used for sending the test gas exhaled by the target object into the collecting pipeline; the throttling assembly is fixed in the collecting pipeline and is used for generating pressure difference of the test gas; the gas outlet is arranged at the second side of the collecting pipeline and is used for outputting the test gas to the collecting pipeline; the first sampling assembly is arranged between the throttling assembly and the air inlet and is close to the throttling assembly; the second sampling assembly is arranged between the throttling assembly and the air outlet and is close to the throttling assembly; and the carbon dioxide acquisition assembly is arranged between the air outlet and the second sampling assembly.
Fig. 1 schematically illustrates an internal block diagram of a collection conduit according to an embodiment of the present disclosure.
As shown in fig. 1, the collection conduit 3 includes a sampling conduit wall 301, an air inlet 302, a throttling assembly 14, an air outlet 303, a first sampling assembly 304, a second sampling assembly 305, and a carbon dioxide collection assembly 306.
According to the embodiment of the disclosure, the volume carbon dioxide acquisition device can obtain the volume of the test gas by measuring the gas pressure difference of the test gas, and measure the carbon dioxide concentration of the test gas, and finally obtain the acquisition device of the volume carbon dioxide information of the test gas.
According to an embodiment of the present disclosure, when the exhaled gas of the target object is collected using the volumetric carbon dioxide collection device, the target object directs the mouth at the gas inlet 302, exhales the test gas from the gas inlet 302, and the volumetric carbon dioxide collection device feeds the test gas into the device through the gas inlet 302. The throttling assembly 14 is secured within the collection conduit and the test gas passes through the inlet 302 to the throttling assembly 14 and out of the throttling assembly 14. No movement between the throttling assembly 14 and the collection conduit wall 301 occurs as the test gas passes through the throttling assembly 14. After passing through the throttling assembly 14, the test gas reaches the gas outlet 303, and the gas outlet 303 outputs the test gas to the collection pipe 3. The air inlet 302 and the air outlet 303 are arranged on two sides of the collecting pipeline 3, the air inlet 302 is arranged on a first side of the collecting pipeline, and the air outlet 303 is arranged on a second side of the collecting pipeline 3 corresponding to the air outlet 302.
A first sampling assembly 304 disposed between the throttling assembly 14 and the gas inlet 302, the first sampling assembly 304 being capable of sampling the gas pressure of the test gas prior to passing through the throttling assembly 304; a second sampling assembly 305, disposed between the throttling assembly 14 and the gas outlet 303, is capable of sampling the gas pressure of the test gas after passing through the throttling assembly 304. The first sampling assembly 304 and the second sampling assembly 305 are located on either side of the throttle assembly 14 and are positioned proximate to the throttle assembly 14. The pressure differential of the test gas through the throttling assembly 14 can be acquired by the first sampling assembly 304 and the second sampling assembly 305, and the flow volume of the test gas through the throttling assembly 14 can be obtained. The carbon dioxide collection component 306 is arranged between the air outlet 303 and the second sampling component 305, and can collect the test gas to obtain the carbon dioxide concentration of the test gas.
According to the carbon dioxide collection device, the sampling assemblies are arranged on the two sides of the throttling assembly to obtain the flow volume of the test gas, the collection speed of the carbon dioxide collection assembly can be controlled according to the flow volume of the test gas, the collection flow of the carbon dioxide collection assembly is guaranteed to be equal to the flow of the test gas, and the measurement accuracy is guaranteed while the collection flow is increased. The volume carbon dioxide collection device provided by the disclosure is a portable volume carbon dioxide collection device, can conveniently and simply collect the exhaled gas of a target object, can realize the collection of carbon dioxide at a non-professional collection site, and outputs carbon dioxide map information.
According to an embodiment of the present disclosure, the first sampling assembly 304 and the second sampling assembly 305 may be openings in the sidewall of the collection tube 3 for sampling the gas pressure of the test gas, or may be annular assemblies disposed on the sidewall of the collection tube 3. Carbon dioxide collection assembly 306 may be an opening in the side wall of collection tube 3 or may be a ring assembly disposed on the side wall of collection tube 3.
According to the embodiment of the disclosure, the first sampling component 304, the second sampling component 305 and the carbon dioxide collecting component 306 can directly collect the test gas parameters, and the first sampling component 304, the second sampling component 305 and the carbon dioxide collecting component 306 can also be connected with other sensors to collect the test gas parameters.
Fig. 2 schematically illustrates an internal block diagram of a volumetric carbon dioxide collection device according to an embodiment of the disclosure.
As shown in fig. 2, the volumetric carbon dioxide collection device provided by the present disclosure further includes a carbon dioxide detection device including a first collection tube 4, a second collection tube 5, a carbon dioxide collection chamber 8, and an air pump 10.
According to an embodiment of the present disclosure, primary collection tube 4 connects carbon dioxide collection chamber 8 and carbon dioxide collection assembly 306. The test gas in the collection pipeline 3 passes through the carbon dioxide collection assembly 306 and enters the primary collection pipe 4, the primary collection pipe 4 sends the test gas into the carbon dioxide collection chamber 8, and the carbon dioxide collection chamber 8 can test the test gas staying in the gas chamber. For example, the carbon dioxide collection chamber 8 is equipped with a carbon dioxide sensor that can detect the carbon dioxide concentration of the test gas by a non-dispersive infrared method.
The suction pump 10 is connected to the carbon dioxide collection chamber 8 through the secondary collection tube 5. The air pump 10 can pump the test gas in the collection pipeline 3 into the carbon dioxide collection chamber 8 through the first collection pipe 4 and the second collection pipe 5; the test gas in the carbon dioxide collection chamber 8 is drawn out through the secondary collection tube 5 and discharged to the outside through an exhaust tube (not shown).
According to the embodiment of the disclosure, as shown in fig. 2, the volumetric carbon dioxide collection device further includes a circuit board 11, and a controller is disposed on the circuit board 11, and the controller can control the pumping flow of the pumping pump 10. The controller can output preset sampling flow through an algorithm, and the air pump is used for extracting test gas according to the preset sampling flow.
According to an embodiment of the present disclosure, as shown in fig. 2, the volumetric carbon dioxide collection device further comprises a pressure differential sensing device 9, the third collection tube 7 connects the pressure differential sensing device 9 to the first sampling assembly 304, and the fourth collection tube 6 connects the pressure differential sensing device 9 to the second sampling assembly 305. The pressure detection device 9 is connected with the first sampling assembly 304 and the second sampling assembly 305 at the same time, and can synchronously detect the gas pressure difference before and after the test gas passes through the throttling assembly 14, and then obtain the flow of the test gas at the current moment according to the gas pressure difference.
According to the embodiment of the disclosure, after the pressure difference detecting device 9 obtains the flow rate of the test gas at the current moment according to the gas pressure difference, the actual flow rate information of the test gas at the current moment is transmitted to the controller, and the controller outputs the preset sampling flow rate in real time. The controller controls the pumping flow of the pumping pump 10 in real time according to the preset sampling flow, and pumps the test gas from the sampling pipeline 3 to the carbon dioxide collection chamber 8.
The controller is arranged, the air extraction flow of the air extraction pump is controlled in real time through the controller, the air extraction flow of the air extraction pump is guaranteed to be consistent with the flow of the test gas, and the accuracy of measuring the concentration of carbon dioxide is guaranteed while the volumetric carbon dioxide is conveniently measured.
According to an embodiment of the present disclosure, as shown in fig. 2, the volumetric carbon dioxide collection device provided by the present disclosure further includes a handheld housing 16 disposed below the collection tube 3 for supporting the collection tube 3. And includes other functional modules and functional structures within the interior of the hand-held housing 16 for supporting the capture function of the volumetric carbon dioxide capture device.
According to an embodiment of the present disclosure, as shown in fig. 2, the volumetric carbon dioxide collection device provided by the present disclosure further includes a key assembly 2 and an indication assembly 1. The button assembly 2 is arranged on the side face of the handheld shell, and a target object can turn on or off the volumetric carbon dioxide collection device through the button assembly 2.
According to the embodiment of the present disclosure, the key assembly 2 can also implement other measurement functions according to the pressing time, for example, when the key assembly 2 is operated for 3 seconds, the measurement data can be implemented as a clear function.
The indicating component 1 is arranged on the side face of the handheld shell, and when the target object starts the machine through the key component 2, the target object can operate the volume carbon dioxide collecting device according to the indication of the indicating component 1 to collect the exhaled air.
According to embodiments of the present disclosure, the indication assembly 1 may include a plurality of indication lamps, indication screens, and the like. For example, when the indication assembly 1 includes three indication lamps of red, green and yellow, the target subject can perform the collection operation according to the meaning indicated by the different indication lamps.
According to the embodiment of the disclosure, the volumetric carbon dioxide collection device provided by the disclosure may further include a buzzer component disposed inside or on a side wall of the handheld housing, for cooperating with the indication component 1 to indicate the target object to collect.
According to an embodiment of the present disclosure, as shown in fig. 2, the volumetric carbon dioxide collection device provided by the present disclosure further includes a temperature detection assembly, a heating assembly, and an air hole array 15.
The temperature detection component is arranged in the handheld shell 16, can be arranged on the circuit board 11 and can detect the temperature of the volumetric carbon dioxide collection device. The temperature detection assembly may be a temperature sensor.
And the heating component is attached to the inside of the handheld shell and can maintain the temperature of the volumetric carbon dioxide collection device. The heating element may be a flexible heater attached to the inner wall of the hand held housing 16.
The air hole array 15 is arranged on the side surface of the handheld shell 16, and can exhaust and radiate the volume carbon dioxide acquisition device. Since the gas exhaled by the target object may enter the interior of the handheld housing 16 from the outside, when the exhaled gas cools and condenses in the interior of the handheld housing 16, the exhaled gas will affect the components of the apparatus, so the air hole array 15 can exhaust the exhaled gas entering from the outside, and can avoid the phenomenon of vapor condensation. After the temperature detection component detects the temperature of the volume carbon dioxide acquisition device, the temperature detection component can transmit temperature information to the controller, and when the temperature of the volume carbon dioxide acquisition device does not meet preset conditions, the controller can control the heating component to heat the volume carbon dioxide acquisition device. In addition, when heating element heats volumetric carbon dioxide collection system, the gas pocket array black can exhaust and dispel the heat to volumetric carbon dioxide collection system.
According to the embodiment of the disclosure, the preset condition may be 37 ℃, and when the temperature of the volumetric carbon dioxide collection device is lower than 37 ℃, the controller can control the heating assembly to heat the volumetric carbon dioxide collection device, so that the temperature of the whole gas path can be maintained near 37 ℃.
According to an embodiment of the present disclosure, the volumetric carbon dioxide collection device provided by the present disclosure may further include a power supply and charging module, as shown in fig. 2, including a battery port 12 and a charging interface 13. When the electrical power of the volumetric carbon dioxide collection device is used, operation may be maintained by replacing the batteries within the battery port 12. The volumetric carbon dioxide collection device can be charged through the charging interface 13, so that the volumetric carbon dioxide collection device can be used.
According to the embodiment of the disclosure, the volumetric carbon dioxide collection device provided by the disclosure can further comprise a data transmission module, wherein the data transmission module comprises various modes such as 4G transmission, WIFI transmission, transmission line transmission and the like. The volume carbon dioxide acquisition device can support the output function of a carbon dioxide diagram through the data transmission module, and the information acquired by the volume carbon dioxide acquisition device is transmitted to other display modules of the device or display modules of external devices.
According to the embodiment of the disclosure, the controller on the circuit board 11 can control the air pump 10 to pump air at a preset sampling flow rate, and the controller can receive the carbon dioxide concentration signal from the carbon dioxide detection device through the serial port. The controller receives the gas pressure difference signal of the pressure difference detection device through the IIC protocol, and the flow of the test gas and the volume of the expired gas are obtained through calculation. The controller can output the carbon dioxide concentration of the test gas and the volume relation of the exhaled gas, and the carbon dioxide concentration of the exhaled gas and the volume relation of the exhaled gas are uploaded to the cloud platform through the data transmission module, so that all acquired information of the target object can be recorded conveniently. It should be noted that, the volumetric carbon dioxide collection device provided by the present disclosure includes a plurality of collection assemblies, each of which may be provided with a corresponding functional module in a circuit board, and multiple functions are implemented by a controller.
Fig. 3 schematically illustrates a front view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure. As shown in fig. 3, the handheld housing 16 is located below the volumetric carbon dioxide collection device, the collection pipe 3 is located above the handheld housing 16, and the handheld housing 16 can support other functions through a circuit board inside the handheld housing 16 while supporting the collection pipe 3. The side of the hand-held housing 16 comprises a key assembly 2 and an indication assembly 1, which can indicate the target object to perform corresponding acquisition operation.
Fig. 4 schematically illustrates a left side view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure. As shown in fig. 4, the volumetric carbon dioxide collection device comprises an indication assembly 1, a key assembly 2, a collection tube 3 and a hand-held housing 16. Also included under the hand-held housing 16 is an array of air holes 15, which air holes 15 may be a plurality of irregular hole arrays.
Fig. 5 schematically illustrates a rear view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure. As shown in fig. 5, it can be seen that the air vent array 15 is located on the side opposite the indicator assembly 1 and key assembly 2, below the hand-held housing 16, for venting and dissipating heat from the volumetric carbon dioxide collection device.
Fig. 6 schematically illustrates a top view of a volumetric carbon dioxide collection device according to an embodiment of the disclosure. As shown in fig. 6, the collection tube 3 is located directly above the hand-held housing 16, and the hand-held housing 16 may be a hollow cylindrical housing. Note that the shape of the hand-held housing is not limited to the above-described shape, and may be a hollow rectangular parallelepiped or the like.
According to the specific embodiment of the disclosure, when a target object starts an instrument, a red indicator light of an indicator assembly is turned on, the instrument waits for 3 seconds, and after a yellow indicator light is turned on, the target object contains a mouth and breathes normally against an air inlet of a collection pipeline in an oral breathing mode; after repeated respiration for a plurality of times, when the green indicator lights are lightened, the buzzer component sends out a prompt tone to indicate that the detection is finished. In addition, if the red indicator lights flash, indicating that the device is too low in power, charging is required.
Fig. 7 schematically illustrates a flow chart of a carbon dioxide capture method according to another embodiment of the present disclosure.
As shown in fig. 7, the method includes S701 to S706.
In operation S701, the gas inlet feeds test gas exhaled by the tester into the collection conduit.
In operation S702, the throttling assembly generates a pressure differential for the test gas.
In operation S703, the gas outlet outputs the test gas to the collection pipe.
In operation S704, the first acquisition assembly acquires a gas pressure of the test gas prior to entering the throttling assembly.
In operation S705, the second sampling assembly collects a gas pressure of the test gas after passing through the throttling assembly.
In operation S706, the carbon dioxide collection assembly collects the carbon dioxide concentration of the test gas by controlling the collection flow rate.
According to an embodiment of the present disclosure, after the volumetric carbon dioxide collection device is turned on, test gas is output from gas inlet 302 through collection conduit 3 to gas outlet 303. In this process, the test gas passes through the restriction 14, creating a pressure differential across the first collection assembly 304 and the second sampling assembly 305, and a pressure differential detection device calculates the flow of gas through the restriction 14 by the first collection assembly 304 and the second sampling assembly 305. Simultaneously, the air pump 10 starts to pump air at a preset sampling flow rate under the control of the controller on the circuit board, and under the driving of the air pump 10, the test gas in the collection pipeline 3 enters the carbon dioxide collection chamber 8 through the carbon dioxide collection assembly at a specified flow rate. The test gas in the carbon dioxide collection chamber 8 finally passes through the exhaust pipe of the air pump 10 into the external ambient environment.
According to the carbon dioxide collection device, the sampling assemblies are arranged on the two sides of the throttling assembly to obtain the flow volume of the test gas, the collection speed of the carbon dioxide collection assembly can be controlled according to the flow volume of the test gas, the collection flow of the carbon dioxide collection assembly is guaranteed to be equal to the flow of the test gas, and the measurement accuracy is guaranteed while the collection flow is increased. The volume carbon dioxide collection device provided by the disclosure is a portable volume carbon dioxide collection device, can conveniently and simply collect the exhaled gas of a target object, can realize the collection of carbon dioxide at a non-professional collection site, and outputs carbon dioxide map information.
Fig. 8 schematically illustrates a flow chart for controlling an extraction pump according to another embodiment of the present disclosure.
As shown in fig. 8, the method includes S801 to S802.
In operation S801, the controller outputs a preset sampling flow rate.
According to the embodiment of the disclosure, the controller obtains the gas flow of the test gas at the current moment according to the pressure difference information output by the pressure difference detection device. And the controller calculates and obtains a preset sampling flow according to the gas flow of the test gas at the current moment. The preset sampling flow rate is changed according to the flow rate change of the test gas.
In operation S802, the pump pumps a test gas according to a preset sampling flow rate.
According to the embodiment of the disclosure, after the controller outputs the preset sampling flow, the controller controls the air pump according to the preset sampling flow, so that the air pump pumps the test gas at the air pumping flow of the preset sampling flow. The predicted sampling flow is equal to the flow of the test gas at the current time. When the volumetric carbon dioxide collection device is started, the air pump pumps air according to the initial sampling flow set by the controller.
According to an embodiment of the present disclosure, the controller outputs a preset sampling flow rate using an adaptive adjustment algorithm. According to an embodiment of the present disclosure, the adaptive adjustment algorithm includes a phase of predicting a sampling flow at a next time, an error calculation phase, and a smoothing parameter adaptive adjustment phase.
The sampling flow stage at the next time is predicted according to the flow of the test gas at all times before the current time, so as to obtain a predicted result, and the predicted result meets the formula:
wherein alpha 0 is an initial smoothing parameter, N actual sampling flow values are selected for calculation, fi is the actual sampling flow at the ith moment,
is the predicted flow rate at the predicted i+1th time.
The error calculation stage is to obtain an error flow according to the predicted flow at the i+1th moment and the actual sampling flow at the i+1th moment, and a formula for calculating the error flow meets the following conditions:
wherein E is i+1 Indicating the error flow at time i +1,
f for the predicted flow rate at the predicted i+1th time i+1 Is the actual sampled flow at time i+1.
According to the error flow E at the (i+1) th moment i+1 Obtaining average error flow, and calculating the formula of the average error flow to satisfy the following conditions:
wherein W represents error flow of a total of W moments,
represents the average error flow, E x Indicating the error flow at time x.
The self-adaptive adjustment stage of the smoothing parameters is to obtain new smoothing parameters according to the average error flow, and the formula for calculating the new smoothing parameters meets the following conditions:
wherein alpha is i The smoothing parameter at the i-th moment is represented, beta is a self-adjusting coefficient,
represents the average error flow, E i+1 The error flow rate at the i+1 time is shown.
Then, obtaining a preset sampling flow according to the new smoothing parameters, and calculating a formula for predicting the sampling flow to satisfy the following conditions:
f i+1 ＝α i+1 f i +α i+1 (1-α i+1 )f i-1 +α i+1 (1-α i+1 ) 2 f i-2 +…(5)
wherein alpha is i+1 A smoothing parameter indicating the i+1th time, f i+1 The preset sampling flow at the i+1th moment.
In the carbon dioxide collection method provided by the disclosure, the controller outputs the preset sampling flow by adopting the self-adaptive adjustment algorithm, so that the extraction flow of the air pump can be ensured to be the same as the flow of the test gas. Through the real-time regulation sampling flow, the problem that the characteristic parameters of the volume carbon dioxide images of different test gas flows are inconsistent can be solved, and the accuracy of the volume carbon dioxide images output by the volume carbon dioxide acquisition device is ensured.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.
Claims (5)
1. A volumetric carbon dioxide collection device comprising:
the air inlet is arranged at the first side of the collecting pipeline and is used for sending the test gas exhaled by the target object into the collecting pipeline;
the throttling assembly is fixed inside the collecting pipeline and is used for generating a pressure difference of the test gas;
the gas outlet is arranged at the second side of the collecting pipeline and is used for outputting the test gas to the collecting pipeline;
the first sampling assembly is arranged between the throttling assembly and the air inlet and is close to the throttling assembly;
the second sampling assembly is arranged between the throttling assembly and the air outlet and is close to the throttling assembly; and
the carbon dioxide acquisition component is arranged between the air outlet and the second sampling component;
the carbon dioxide detection device comprises a carbon dioxide acquisition chamber, an air pump, a first acquisition pipe and a second acquisition pipe; wherein the method comprises the steps of
The carbon dioxide collection chamber is connected to the carbon dioxide collection assembly through the first collection pipe and is used for detecting the carbon dioxide concentration of the test gas; and
the air extracting pump is connected to the carbon dioxide collecting chamber through the second collecting pipe and is used for extracting the test gas from the carbon dioxide collecting assembly into the carbon dioxide collecting chamber;
the pressure difference detection device is connected to the first sampling assembly through a third collecting pipe and connected with the second sampling assembly through a fourth collecting pipe, and is used for detecting the gas pressure difference of the test gas passing through the throttling assembly, determining the actual flow information of the test gas at the current moment according to the gas pressure difference, and transmitting the actual flow information to a controller;
the controller is used for receiving the actual flow information and outputting a preset sampling flow in real time according to the actual flow information so that the air pump can extract the test gas according to the preset sampling flow;
wherein the controller outputs the preset sampling flow by utilizing an adaptive adjustment algorithm, the adaptive adjustment algorithm comprises a sampling flow prediction stage at the next moment, an error calculation stage and a smoothing parameter adaptive adjustment stage,
in the stage of predicting the sampling flow at the next moment, obtaining a prediction result according to the flow of the test gas at all moments before the current moment, wherein the prediction result meets the formula:
wherein alpha is 0 For initial smoothing parameters, F i For the actual sampled flow at time i,
the predicted flow rate at the predicted i+1th moment;
in the error calculation stage, according to the predicted flow at the i+1 time and the actual sampling flow at the i+1 time, obtaining an error flow, wherein a formula for calculating the error flow meets the following conditions:
the formula for calculating the average error flow at W times satisfies:
wherein W represents the error flow of W times,
represents W timesMean error flow of etching E x Indicating the error flow at the x-th time;
in the self-adaptive adjustment stage of the smoothing parameters, new smoothing parameters are obtained according to the average error flow at W moments and the error flow at the (i+1) th moment, and the formula for calculating the new smoothing parameters meets the following requirements:
wherein alpha is i The smoothing parameter at the i-th moment is represented, beta is a self-adjusting coefficient,
represents the average error flow rate at W times E i+1 The error flow at the i+1th time is represented;
obtaining a preset sampling flow according to the new smoothing parameters, wherein a formula for calculating the preset sampling flow meets the following conditions:
f i+1 ＝α i+1 f i +α i+1 (1-α i+1 )f i-1 +α i+1 (1-α i+1 ) 2 f i-2 +…(5)
wherein alpha is i+1 A smoothing parameter indicating the i+1th time, f i+1 The preset sampling flow at the i+1th moment.
2. The device of claim 1, further comprising a handheld housing disposed below the collection conduit for supporting the collection conduit.
3. The device of claim 2, further comprising a key assembly and an indication assembly, wherein
The key assembly is arranged on the side surface of the handheld shell and is used for opening or closing the volumetric carbon dioxide acquisition device; and
the indicating assembly is arranged on the side face of the handheld shell, and is used for indicating a tester to perform acquisition operation after the machine is started through the key assembly.
4. The apparatus of claim 2, further comprising a temperature sensing assembly, a heating assembly, and an array of air holes, wherein
The temperature detection assembly is arranged in the handheld shell and is used for detecting the temperature of the volumetric carbon dioxide acquisition device;
the heating component is attached to the inside of the handheld shell and is used for maintaining the temperature of the volumetric carbon dioxide collection device;
the air hole array is arranged on the side surface of the handheld shell and is used for exhausting and radiating the volume carbon dioxide acquisition device; and
the temperature detection assembly detects the temperature of the volume carbon dioxide collecting device, and when the temperature of the volume carbon dioxide collecting device does not meet preset conditions, the heating assembly is used for heating the volume carbon dioxide collecting device, and the air hole array is used for exhausting and radiating the volume carbon dioxide collecting device.
5. A volumetric carbon dioxide collection method applied to the volumetric carbon dioxide collection apparatus according to any of claims 1 to 4, comprising:
the air inlet sends the test gas exhaled by the target object into the acquisition pipeline;
a throttling assembly generates a pressure differential for the test gas;
the gas outlet outputs the test gas to the collection pipeline;
the first acquisition component acquires the gas pressure of the test gas before entering the throttling component;
a second sampling assembly collects the gas pressure of the test gas after passing through the throttling assembly; and
the carbon dioxide collection assembly collects the test gas to a carbon dioxide collection chamber through an air pump so that the carbon dioxide collection chamber detects the carbon dioxide concentration of the test gas;
the pressure difference detection device determines actual flow information of the test gas at the current moment according to the gas pressure difference of the test gas passing through the throttling assembly, and transmits the actual flow information to the controller;
the controller outputs preset sampling flow according to the actual flow information;
the air pump pumps the test gas according to the preset sampling flow;
wherein the controller outputs the preset sampling flow by utilizing an adaptive adjustment algorithm, the adaptive adjustment algorithm comprises a sampling flow prediction stage at the next moment, an error calculation stage and a smoothing parameter adaptive adjustment stage,
in the stage of predicting the sampling flow at the next moment, obtaining a prediction result according to the flow of the test gas at all moments before the current moment, wherein the prediction result meets the formula:
wherein alpha is 0 For initial smoothing parameters, F i For the actual sampled flow at time i,
the predicted flow rate at the predicted i+1th moment;
in the error calculation stage, according to the predicted flow at the i+1 time and the actual sampling flow at the i+1 time, obtaining an error flow, wherein a formula for calculating the error flow meets the following conditions:
the formula for calculating the average error flow at W times satisfies:
wherein W represents the error flow of W times,
represents the average error flow rate at W times E x Indicating the error flow at the x-th time;
in the self-adaptive adjustment stage of the smoothing parameters, new smoothing parameters are obtained according to the average error flow at W moments and the error flow at the (i+1) th moment, and the formula for calculating the new smoothing parameters meets the following requirements:
wherein alpha is i The smoothing parameter at the i-th moment is represented, beta is a self-adjusting coefficient,
represents the average error flow rate at W times E i+1 The error flow at the i+1th time is represented;
obtaining a preset sampling flow according to the new smoothing parameters, wherein a formula for calculating the preset sampling flow meets the following conditions:
f i+1 ＝α i+1 f i +α i+1 (1-α i+1 )f i-1 +α i+1 (1-α i+1 ) 2 f i-2 +…(5)
wherein alpha is i+1 A smoothing parameter indicating the i+1th time, f i+1 The preset sampling flow at the i+1th moment.
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