CN115979355A - Gas measuring device, gas flow rate measuring method, and total gas amount measuring method - Google Patents
Gas measuring device, gas flow rate measuring method, and total gas amount measuring method Download PDFInfo
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Abstract
The application relates to a gas measuring device, a gas flow measuring method and a gas total quantity measuring method, and relates to the technical field of gas measurement. The gas measuring device comprises a main machine body, a processor is arranged in the main machine body, a ventilation pipeline is arranged on the main machine body and comprises a gas inlet pipeline and a gas outlet pipeline which are communicated, one end of the gas inlet pipeline extends out of the main machine body, the end of the gas inlet pipeline is provided with a gas inlet, one end of the gas outlet pipeline extends out of the main machine body, the end of the gas outlet pipeline is provided with a gas outlet, and an acute angle, a right angle or an obtuse angle is formed between the length direction of the gas outlet pipeline and the length direction of the gas inlet pipeline; an air pressure sensor is arranged at the joint of the air outlet pipeline and the air inlet pipeline; the air pressure sensor is in communication connection with the processor; the application also discloses a gas flow measuring method and a gas total amount measuring method. The measuring device is low in cost, compact and small in structure, and the measured data is accurate and reliable.
Description
Technical Field
The present disclosure relates to gas measurement technologies, and in particular, to a gas measurement device, a gas flow measurement method, and a gas total amount measurement method.
Background
The gas measurement is widely applied in production and life, for example, when a traffic control department inspects drunk driving, when a spirit meter is used for measuring the alcohol content of gas, the alcohol content in the gas exhaled by a tester needs to be rapidly obtained according to the breath flow of each person and the reaction amount of alcohol substances in the gas exhaled by the human body. For example, in a part of industrial production processes, various types of gases are used or operated, the flow of the gases is needed, the required gas flow parameters are achieved, and the normal industrial production requirements are met.
In the related technology, the sampling flowmeter is used for measuring the gas flow and the total blowing amount, the scheme is complex and expensive, the sampling flowmeter is not suitable for an alcohol tester with high portability requirements, and the enterprise burden is increased in industrial production.
Disclosure of Invention
In order to reduce the cost of the gas flow and total amount measuring device and ensure the accuracy of the gas flow and total amount measurement, the application provides a gas measuring device, a gas flow measuring method and a gas total amount measuring method.
In a first aspect, the present application provides a gas measurement apparatus, which adopts the following technical solution:
a gas measuring device comprises a main machine body, wherein a processor is arranged in the main machine body, an air duct is arranged on the main machine body and comprises an air inlet duct and an air outlet duct which are communicated, one end of the air inlet duct extends out of the main machine body and is provided with an air inlet, one end of the air outlet duct extends out of the main machine body and is provided with an air outlet, and an acute angle, a right angle or an obtuse angle is formed between the length direction of the air outlet duct and the length direction of the air inlet duct; an air pressure sensor is arranged at the joint of the air outlet pipeline and the air inlet pipeline; the air pressure sensor is in communication connection with the processor.
The implementation principle is as follows: when the pressure sensor is used, curve relations between different flow rates and corresponding pressures detected by the air pressure sensor are obtained according to standard data, and a corresponding calculation formula is obtained; and then, in an actual application scene, according to the curve relation and the corresponding calculation formula obtained before, the air pressure value detected by the single-point air pressure sensor in the air duct is adopted, the calculation of the air flow and the calculation of the total air quantity are realized through a gas pressure value homography and proofreading mode, and the requirements of the alcohol meter on the use scenes of testing the total air quantity, monitoring the air quantity and the like can be well met.
For example, when alcohol expiration is detected, when a tested person blows air from an air inlet of an air inlet pipeline, when the air reaches a joint of the air outlet pipeline and the air inlet pipeline through a ventilation pipeline at the flow rate of f, the air pressure sensor is used for sensing the blowing pressure, the air flows out from an air outlet of the air outlet pipeline after being sensed by the air pressure sensor, the pressure value detected by the air pressure sensor and the blowing flow rate form a certain proportional relation, the blowing speed is higher, the pressure value detected by the air pressure sensor is higher, and the pressure value detected by the air pressure sensor is smaller if the pressure value is higher, otherwise, the pressure value is smaller. This application utilizes the pressure value that baroceptor detected among the breather pipe to deduce the gas flow that blows of the air inlet department of locating the inlet duct to deduce the total amount of blowing.
By adopting the technical scheme, the whole measuring device has the advantages of simple and small structure, few parts, low manufacturing cost and accurate and reliable measurement.
Optionally, the air pressure sensor is an H-bridge air pressure sensor; the joint of the air outlet pipeline and the air inlet pipeline is positioned in the main machine body.
By adopting the technical scheme, the H-bridge air pressure sensor is mature in technology, low in cost, accurate in measurement and more compact and reliable in overall structure.
Optionally, the air pressure sensor is arranged on the inner wall of the air outlet pipeline close to one end of the air inlet pipeline.
By adopting the technical scheme, the installation is convenient, the process difficulty is reduced, and the manufacturing cost is further reduced.
Optionally, the pipeline of giving vent to anger is close to begin there is the mounting hole on the inner wall of intake stack one end, the mounting hole orientation the air inlet of intake stack, baroceptor inlays to be established in the mounting hole, baroceptor's detection face with the inner wall of the pipeline of giving vent to anger is parallel and level.
Through adopting foretell technical scheme, can guarantee overall structure's compact like this to effectively prevent the air current disorder, improve the accurate reliability of measurement.
In a second aspect, the present application provides a method for measuring a gas flow, which adopts the following technical solution:
a gas flow measuring method using the measuring device comprises the following steps:
s1: finding out the curve relation between different flows and the corresponding pressure detected by the air pressure sensor: gas with different flow rates f (f 1, f2 ... fn) is introduced from an air inlet of an air inlet pipeline, corresponding pressure values p (p 1, p2 ... pn) are detected through an air pressure sensor, and the curve relation of the corresponding pressure p under different flow rates f is as follows:
p＝a*f 2 +b*f
wherein, p: gas pressure (pressure); f inlet flow rate (flow); a, b are constants related to the structure and the size of the vent pipeline; s2: calculating the values of a and b according to the curve relation between the different flow rates f and the corresponding pressure p;
s3: introducing gas to be detected into a ventilation pipeline, and measuring a pressure value p at the joint of the gas pipeline in the ventilation pipeline and the gas inlet pipeline by using a gas pressure sensor; according to p = a f 2 The + b f formula inversely calculates the value of the intake air flow f.
For example, when alcohol respiration detection is carried out, when a tested person blows air from an air inlet of an air inlet pipeline, when the air reaches the joint of the air outlet pipeline and the air inlet pipeline through a ventilation pipeline at the flow rate of f, the air pressure sensor is used for sensing the blowing pressure, the air flows out from an air outlet of the air outlet pipeline after being sensed by the air pressure sensor, the pressure value detected by the air pressure sensor and the blowing flow rate form a certain proportional relation, and the faster the blowing speed is, the larger the pressure value detected by the air pressure sensor is, and the smaller the pressure value is vice versa. The pressure value that this application utilized atmospheric pressure sensor to detect in the breather pipe derives the gas flow that blows of the air inlet department of locating the inlet duct to derive the total amount of blowing. By adopting the technical scheme, the whole measurement logic is clear, the requirement on a processor is not high, and the gas flow value and the total value can be measured with low cost and high precision.
Optionally, in the step S3, p = a × f 2 The known values a, b, p in + b f; and solving according to a quadratic equation to obtain the f value.
By adopting the technical scheme, the f value can be calculated by utilizing the processor quickly and efficiently, and the method is very convenient.
Optionally, in the step S3, a real-time flow f value corresponding to each pressure value is obtained by using a curve back-stepping method and a table look-up method.
By adopting the technical scheme, the computing resource of the processor can be saved.
Optionally, in step S1, factory calibration is performed on different individual devices once through a constant flow rate, so as to obtain a calibration coefficient k, and the calibration curve is corrected and taught by using the characteristic parameter k between each device.
By adopting the technical scheme, the factors such as inaccurate measurement, reference voltage, pipeline difference and the like caused by individual difference of the air pressure sensor in each measuring device can be eliminated, the different individual devices are subjected to factory calibration once through a constant flow to obtain a calibration coefficient k, and a calibration curve is corrected and taught by utilizing the characteristic parameter k among each measuring device, so that an updated accurate blowing flow value can be obtained; the following correction formula is derived: p = k a f 2 +k*b*f。
In a third aspect, the present application provides a method for measuring total amount of gas, which adopts the following technical solution:
a method for measuring a total amount of gas by using the above-mentioned measuring apparatus and the above-mentioned method for measuring a gas flow rate, comprising the steps of:
s1: respectively obtaining the starting time t1 and the ending time t2 of the gas introduced into the ventilation pipeline by using a timer, wherein the time difference delta t = t2-t1;
s2: the gas flow rate value f is measured by the gas flow rate measuring method, and the total gas amount V = f × Δ t is calculated.
Through adopting foretell technical scheme, can high-efficient accurate numerical value of measuring gas total amount.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the measuring device in the application has the advantages of simple and small structure, few parts, low manufacturing cost and accurate and reliable measurement.
2. The calibration method has the advantages that the factory calibration is carried out on different individual devices once, a calibration coefficient k is obtained, the calibration curve is corrected and taught by utilizing the characteristic parameter k among all the devices, and the updated accurate gas flow value and total value can be obtained.
3. The method for measuring the gas flow by using the relative pressure difference method is particularly convenient to be used in the field of alcohol measurement, realizes calculation of the gas flow and the total gas flow through a calibration mode by detecting the curve relation between a pressure value of a certain point in the ventilation pipeline and the gas flow, and can well meet the standard requirements of an alcohol meter on testing the total gas flow and monitoring the real-time gas flow.
Drawings
Fig. 1 is a schematic structural view of the measuring apparatus in example 1.
Fig. 2 is a schematic structural view of the measuring apparatus in example 2.
Fig. 3 shows the correspondence between the gas pressure and the gas flow rate.
FIG. 4 is a comparison graph for correcting individual differences of the measuring apparatuses.
In the figure, 1, a main machine body; 11. mounting holes; 2. a processor; 3. an air duct; 31. an air intake duct; 311. an air inlet; 32. an air outlet pipe; 321. an air outlet; 4. an air pressure sensor.
Detailed Description
The present application is described in further detail below with reference to fig. 1-4.
Example 1
Referring to fig. 1, a gas measuring device includes a main body 1, a processor 2 is disposed in the main body 1, an air duct 3 is disposed on the main body 1, the air duct 3 includes an air inlet duct 31 and an air outlet duct 32 that are communicated with each other, one end of the air inlet duct 31 extends out of the main body 1 and has an air inlet 311, one end of the air outlet duct 32 extends out of the main body 1 and has an air outlet 321, and an acute angle, a right angle or an obtuse angle is formed between the length direction of the air outlet duct 32 and the length direction of the air inlet duct 31; an air pressure sensor 4 is arranged at the joint of the air outlet pipeline 32 and the air inlet pipeline 31; baroceptor 4 sets up on the inner wall of pipeline 32 of giving vent to anger near inlet line 31 one end, and the installation of being convenient for like this has reduced the technology degree of difficulty, further reduction manufacturing cost, baroceptor 4 and treater 2 communication connection.
In the application, the air pressure sensor 4 is an H-bridge air pressure sensor 4; the joint of the air outlet pipeline 32 and the air inlet pipeline 31 is positioned in the main machine body 1; the H-bridge air pressure sensor 4 is mature in technology, low in cost, accurate in measurement and more compact and reliable in overall structure.
The implementation principle is as follows: when the pressure sensor is used, the curve relation between different flow rates and the corresponding pressure detected by the air pressure sensor 4 is obtained according to standard data, and a corresponding calculation formula is obtained; and then, in an actual application scene, according to the curve relation and the corresponding calculation formula obtained before, the air pressure value detected by the single-point air pressure sensor 4 in the air duct 3 is adopted, the calculation of the air flow and the calculation of the total air quantity are realized in a gas pressure value homography and proofreading mode, and the requirements of the alcohol meter on the use scenes of testing the total air blowing quantity, monitoring the air blowing and the like can be well met.
For example, when alcohol expiration detection is performed, when a tested person blows air from the air inlet 311 of the air inlet pipeline 31, when the air reaches the joint of the air outlet pipeline 32 and the air inlet pipeline 31 through the air vent pipeline 3 at the flow rate f, the air pressure sensor 4 senses the blowing pressure, the air flows out through the air outlet 321 of the air outlet pipeline 32 after flowing through the air pressure sensor 4, the pressure value detected by the air pressure sensor 4 and the blowing flow rate form a certain direct proportion relation, the faster the blowing speed is, the larger the pressure value detected by the air pressure sensor 4 is, and the smaller the pressure value is otherwise. The present application derives the blowing amount at the air inlet 311 of the air intake duct 31 using the pressure value detected by the air pressure sensor 4 in the air intake duct 3, thereby deriving the total amount of blowing. The whole measuring device is simple and small in structure, few in parts, low in manufacturing cost and accurate and reliable in measurement.
Example 2
Referring to fig. 2, the measuring apparatus of this embodiment is substantially the same as the measuring apparatus of embodiment 1, except that a mounting hole 11 is formed on an inner wall of the outlet pipe 32 near one end of the inlet pipe 31, the mounting hole 11 faces the inlet 311 of the inlet pipe 31, the air pressure sensor 4 is embedded in the mounting hole 11, and a detection surface of the air pressure sensor 4 is flush with the inner wall of the outlet pipe 32. Therefore, the compactness of the whole structure can be ensured, the airflow disorder can be effectively prevented, and the precision and the reliability of measurement can be improved.
Example 3
The application discloses a method for measuring gas flow, the method for measuring in the embodiment uses the measuring device in the embodiment 1 or the embodiment 2 to measure, and the method comprises the following steps:
s1: finding out the curve relation between different flow rates and the corresponding pressure detected by the air pressure sensor 4: the gas with different flow rates f (f 1, f2 ... fn,) is introduced from the gas inlet 311 of the gas inlet pipeline 31, the corresponding pressure value p (p 1, p2 ... pn) is detected by the gas pressure sensor 4, and the curve relation of the corresponding pressure p under different flow rates f is as follows:
p＝a*f 2 +b*f
wherein, p: gas pressure (pressure); f, inlet flow rate (flow); a, b are constants related to the structure and size of the vent pipe 3;
s2: calculating the values of a and b according to the curve relation between the different flow rates f and the corresponding pressure p;
s3: introducing gas to be detected into the ventilation pipeline 3, and measuring a pressure value p at the joint of the gas pipeline and the gas inlet pipeline 31 in the ventilation pipeline 3 by the gas pressure sensor 4; according to p = a f 2 The + b f formula inversely calculates the value of the intake air flow rate f, specifically, p = a f 2 The known values a, b, p in + b f; solving according to a unitary quadratic equation to obtain an f value; the f value can be calculated quickly and efficiently by the processor 2, and the method is very convenient.
For example, when alcohol expiration detection is performed, when a tested person blows air from the air inlet 311 of the air inlet pipeline 31, when the air reaches the joint of the air outlet pipeline 32 and the air inlet pipeline 31 through the air vent pipeline 3 at the flow rate f, the air pressure sensor 4 senses the blowing pressure, the air flows out through the air outlet 321 of the air outlet pipeline 32 after flowing through the air pressure sensor 4, the pressure value detected by the air pressure sensor 4 and the blowing flow rate form a certain direct proportion relation, the faster the blowing speed is, the larger the pressure value detected by the air pressure sensor 4 is, and the smaller the pressure value is otherwise. The present application derives the blowing amount at the air inlet 311 of the air intake duct 31 by using the pressure value detected by the air pressure sensor 4 in the air intake duct 3, thereby deriving the total blowing amount. The whole measurement logic is clear, the requirement on the processor 2 is not high, and the gas flow value and the total value can be measured with low cost and high precision.
In step S1, factory calibration is carried out on different individual devices once through a constant flow to obtain a calibration coefficient k, and a calibration curve is corrected and taught by using a characteristic parameter k between each device; therefore, the measurement inaccuracy caused by individual difference of the air pressure sensor 4 in each measuring device and the interference of factors such as reference voltage and pipeline difference can be eliminated, then different individual devices are subjected to factory calibration once through a constant flow, a calibration coefficient k is obtained, the calibration curve is corrected and taught by utilizing the characteristic parameter k between each measuring device, and the following correction formula is obtained: p = k a f 2 + k × b × f; and an updated accurate blowing flow value can be obtained.
For example, the air inlet of the air inlet pipe 31 blows air into the ventilation pipe 3 with different flow rates, and records the curve relationship of the pressure signal values corresponding to the different flow rates of air, such as:
TABLE 1
Referring to fig. 3, a correspondence relationship between the gas pressure and the gas flow rate is derived therefrom. Wherein y is a voltage signal output by the pressure sensor, and x is an air blowing flow value. Calculated where a =0.0004, b =0.0012.
TABLE 2
Referring to table 2, the data before the calibration and the calibrated value are measured accurately to obtain the corresponding formula value.
Referring to fig. 4, a comparison graph for correcting individual differences of the measuring devices is thus obtained. Wherein y is a voltage signal output by the air pressure sensor, and x is a gas flow value; wherein a =0.0004, b =0.0012, k =1.11.
Example 4
The measuring device in this embodiment is basically the same as the measuring method in embodiment 3, except that in step S3 in this embodiment, the real-time flow f value corresponding to each pressure value is obtained by using a curve back-pushing method and a table look-up method, so that the computing resources of the processor can be saved.
Example 5
The application discloses a method for measuring total gas amount, the measuring method in the embodiment uses the measuring device in the embodiment 1 or the embodiment 2 to measure, and uses the measuring method for gas flow in the embodiment 3 or the embodiment 4 to measure the gas flow, the method for measuring total gas amount comprises the following steps:
s1: respectively obtaining the starting time t1 and the ending time t2 of the gas introduced into the ventilation pipeline 3 by using a timer, wherein the time difference delta t = t2-t1;
s2: the gas flow rate value f is measured by the gas flow rate measuring method, and the total gas amount V = f × Δ t is calculated.
Further, the total blowing amount V is calculated by using the real-time blowing flow value f in an integral mode: v = & (t).
The method and the device can simply calculate the real-time flow value and the total blowing amount value, have high accuracy, low cost and convenient manufacture, and are suitable for large-scale application of product design of products requiring checking the real-time flow and the total blowing amount.
The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore, the method comprises the following steps: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A gas measuring device comprises a main machine body (1), wherein a processor (2) is arranged in the main machine body (1), and the gas measuring device is characterized in that a vent pipeline (3) is arranged on the main machine body (1), the vent pipeline (3) comprises a gas inlet pipeline (31) and a gas outlet pipeline (32) which are communicated with each other, one end of the gas inlet pipeline (31) extends out of the main machine body (1) and is provided with a gas inlet (311), one end of the gas outlet pipeline (32) extends out of the main machine body (1) and is provided with a gas outlet (321), and an acute angle, a right angle or an obtuse angle is formed between the length direction of the gas outlet pipeline (32) and the length direction of the gas inlet pipeline (31); an air pressure sensor (4) is arranged at the joint of the air outlet pipeline (32) and the air inlet pipeline (31); the air pressure sensor (4) is in communication connection with the processor (2).
2. A gas measuring device according to claim 1, characterized in that said gas pressure sensor (4) is an H-bridge gas pressure sensor (4); the joint of the air outlet pipeline (32) and the air inlet pipeline (31) is positioned in the main machine body (1).
3. A gas measuring device as claimed in claim 1 or 2, wherein said gas pressure sensor (4) is arranged on the inner wall of said outlet duct (32) near one end of said inlet duct (31).
4. The gas measuring device according to claim 1 or 2, wherein a mounting hole (11) is formed in the inner wall of the outlet pipe (32) near one end of the inlet pipe (31), the mounting hole (11) faces the inlet (311) of the inlet pipe (31), the gas pressure sensor (4) is embedded in the mounting hole (11), and the detection surface of the gas pressure sensor (4) is flush with the inner wall of the outlet pipe (32).
5. A method for measuring a gas flow rate, wherein the method is measured by the measuring apparatus according to any one of claims 1 to 4, comprising the steps of:
s1: finding out the curve relation between different flow rates and the corresponding pressure detected by the air pressure sensor (4): gas with different flow rates f (f 1, f2 ..., fn,) is introduced from an air inlet (311) of an air inlet pipeline (31), corresponding pressure values p (p 1, p2 ..., pn) are detected through an air pressure sensor (4), and the curve relation between the gas with different flow rates f and the corresponding pressure p is as follows:
p＝a*f 2 +b*f
wherein, p: gas pressure (pressure); f, inlet flow rate (flow); a and b are constants related to the structure and the size of the vent pipeline (3);
s2: calculating the values of a and b according to the curve relation between the different flow rates f and the corresponding pressure p;
s3: introducing gas to be detected into the ventilation pipeline (3), and measuring a pressure value p at the joint of the gas pipeline and the gas inlet pipeline (31) in the ventilation pipeline (3) by the gas pressure sensor (4); according to p = a f 2 The + b f formula inversely calculates the value of the intake air flow f.
6. A method according to claim 5, wherein in step S3, the known values a, b, p; and solving according to a unitary quadratic equation to obtain an f value.
7. The method as claimed in claim 5, wherein in step S3, the real-time flow f value corresponding to each pressure value is obtained by using curve back-estimation and table lookup.
8. The method as claimed in claim 5, wherein in step S1, the calibration factor k is obtained by factory calibration of different individual devices with a constant flow rate, and the calibration curve is calibrated by using the characteristic parameter k between each deviceCorrecting and teaching; and the following correction formula is obtained: p = k a f 2 +k*b*f。
9. A method for measuring a total amount of gas, which is performed by using the measuring apparatus according to any one of claims 1 to 4 and the method for measuring a gas flow rate according to any one of claims 5 to 8, comprising the steps of:
s1: respectively obtaining the starting time t1 and the ending time t2 of the gas introduced into the ventilation pipeline (3) by using a timer, wherein the time difference delta t = t2-t1;
s2: measuring the gas flow rate by the method for measuring the gas flow rate according to any one of claims 5 to 8, measuring a gas flow rate value f, and calculating a total gas amount V = f Δ t.
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| CN202310081707.9A CN115979355A (en) | 2023-02-08 | 2023-02-08 | Gas measuring device, gas flow rate measuring method, and total gas amount measuring method |
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| CN202310081707.9A CN115979355A (en) | 2023-02-08 | 2023-02-08 | Gas measuring device, gas flow rate measuring method, and total gas amount measuring method |
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