Differential pressure flow sensor classification method and classification system
阅读说明：本技术 压差流量传感器分类方法及分类系统 (Differential pressure flow sensor classification method and classification system ) 是由 陈镇鑫 于 2018-08-27 设计创作，主要内容包括：本发明提供了一种压差流量传感器分类方法,用于对多个压差流量传感器进行分类,包括以下步骤：向待分类压差流量传感器内输入流体；调节所述流体的流量,采集不同流量下流经所述待分类压差流量传感器节流装置的压差；获取待分类特性曲线,所述待分类特性曲线为待分类压差流量传感器的压差-流量曲线；根据所述待分类特性曲线对所述待分类压差传感器进行分类。本发明还提供了一种压差流量传感器分类系统。本发明依照待分类压差传感器的压差-流量曲线对其进行分类,在一次性使用传感器的仪器中使用同一类的压差了流量传感器能够避免反复校准,使得流体测量更方便。(The invention provides a differential pressure flow sensor classification method, which is used for classifying a plurality of differential pressure flow sensors and comprises the following steps: inputting fluid into a differential pressure flow sensor to be classified; adjusting the flow of the fluid, and collecting the pressure difference flowing through the throttling device of the differential pressure flow sensor to be classified under different flow rates; acquiring a characteristic curve to be classified, wherein the characteristic curve to be classified is a differential pressure-flow curve of a differential pressure flow sensor to be classified; and classifying the differential pressure sensor to be classified according to the characteristic curve to be classified. The invention also provides a differential pressure flow sensor classification system. The invention classifies the differential pressure-flow curve of the differential pressure sensor to be classified, and the same type of differential pressure is used in the instrument using the disposable sensor, so that the flow sensor can avoid repeated calibration, and the fluid measurement is more convenient.)
1. A differential pressure flow sensor classification method for classifying a plurality of differential pressure flow sensors, comprising the steps of: inputting fluid into a differential pressure flow sensor to be classified; adjusting the flow of the fluid, and collecting the pressure difference flowing through the throttling device of the differential pressure flow sensor to be classified under different flow rates; acquiring a characteristic curve to be classified, wherein the characteristic curve to be classified is a differential pressure-flow curve of a differential pressure flow sensor to be classified; and classifying the differential pressure sensor to be classified according to the characteristic curve to be classified.
2. The differential pressure flow sensor classification method according to claim 1, characterized in that the method further comprises the step of compensating the characteristic curve to be classified to obtain a compensation characteristic curve to be classified, wherein the compensation coefficient of the compensation characteristic curve to be classified
3. The differential pressure flow sensor classification method according to claim 2, wherein classifying the differential pressure sensor to be classified according to the characteristic curve to be classified further comprises the steps of: setting different classification levels of a plurality of differential pressure flow sensors, and determining a plurality of standard classification curves, wherein the standard classification curves refer to differential pressure-flow curves of the standard differential pressure flow sensors in each classification level; and comparing the compensation characteristic curve to be classified with a plurality of standard classification curves, and classifying the differential pressure sensor to be classified.
4. The differential pressure flow sensor classification method of claim 3, wherein the method of comparing the compensation characteristic to be classified to a plurality of standard classification curves comprises the steps of:
sequencing the differential pressure flow sensors to be classified and classification grades, determining a first differential pressure flow sensor to be classified as a current differential pressure flow sensor to be classified, and determining a first classification grade as a current classification grade;
calculating a variation coefficient c between a current compensation characteristic curve and a current standard classification curve, wherein the current compensation characteristic curve is a differential pressure-flow curve of a differential pressure flow sensor to be classified currently; the current standard classification curve is a standard classification curve of the current classification grade; the variation coefficient c = (sigma/rms) × 100%, the sigma is a standard deviation between a pressure difference value corresponding to each flow in the characteristic curve to be classified and a pressure difference value corresponding to the flow in the current standard classification curve, and the rms is an average value of differences between the pressure difference value corresponding to each flow in the characteristic curve to be classified and the pressure difference value corresponding to the flow in the current standard classification curve;
judging the relation between the variation coefficient and the variation threshold value; when the variation coefficient is larger than the variation threshold, taking the next classification level as the current classification level, and returning to calculate the variation coefficient c between the current compensation characteristic curve and the current standard classification curve; when the variation coefficient is smaller than or equal to a variation threshold value, determining that the current differential pressure flow sensor to be classified belongs to the current classification grade, and entering the next step, wherein the variation threshold value is determined according to the classification requirement;
judging whether the current differential pressure flow sensor to be classified is the last differential pressure flow sensor to be classified; when the current differential pressure flow sensor to be classified is not the last differential pressure flow sensor to be classified, the next differential pressure flow sensor to be classified is the current differential pressure sensor to be classified, and the coefficient of variation c between the current compensation characteristic curve and the current standard classification curve is calculated; and finishing classification when the current differential pressure flow sensor to be classified is the last differential pressure flow sensor to be classified.
5. The differential pressure flow sensor classification method of claim 4, wherein the variance threshold is not greater than 15%.
6. A differential pressure flow sensor classification system for classifying a plurality of differential pressure flow sensors, the classification system comprising:
the flow control mechanism is used for controlling the input of fluid into the differential pressure flow sensor to be classified and controlling the flow of the fluid;
the differential pressure sensor is used for acquiring the differential pressure flowing through the throttling device of the differential pressure sensor to be classified under different flow rates in real time;
a processor;
and the storage medium is stored with a plurality of instructions, and when the instructions are executed by the processor, the processor receives the flow data regulated by the current flow control mechanism and the differential pressure data acquired by the differential pressure sensor, and determines a differential pressure-flow curve of the differential pressure sensor to be classified according to the flow data and the differential pressure data.
7. The differential pressure flow sensor classification system as recited in claim 6, wherein a standard temperature sensor is used to detect an ambient temperature surrounding the differential pressure flow sensor;
a standard humidity sensor for detecting the ambient humidity around the differential pressure flow sensor;
the standard atmospheric pressure sensor is used for detecting the atmospheric pressure in the current environment;
the processor can also receive the temperature, the humidity and the atmospheric pressure in the current environment, and determine a compensation coefficient R of a differential pressure-flow characteristic curve according to the temperature, the relative humidity and the atmospheric pressure in the current environment and the temperature, the relative humidity and the atmospheric pressure in the standard working condition; the compensation coefficient
8. The differential pressure flow sensor classification system according to claim 7, wherein the storage medium further stores a plurality of standard classification curves, the standard classification curves being differential pressure-flow curves of standard differential pressure flow sensors within each classification level; the classification grade refers to the classification of the differential pressure flow sensor according to actual needs; the processor compares the differential pressure-flow curve of the differential pressure flow sensor to be classified to a plurality of standard classification curves.
Technical Field
The invention relates to the technical field of sensor test classification, in particular to a differential pressure flow sensor classification method and a differential pressure flow sensor classification system.
Background
The differential pressure flow sensor is an instrument for measuring flow, and is used for measuring flow by measuring differential pressure according to the principle that a certain relation exists between the differential pressure and the flow generated when fluid flows through a throttling device. However, due to material, manufacturing process, and other factors, the uniformity of the characteristic curves between different differential pressure flow sensors is generally poor during mass production. For the situation that the flow sensor is used once in the fluid flow detection process, for example, a lung function instrument is used for testing the lung functions of different patients, in order to avoid cross infection, different flow sensors are usually required to be replaced when testing the lung functions of different patients, and the different flow sensors are difficult to calibrate by adopting the traditional calibration method.
Disclosure of Invention
The invention provides a differential pressure flow sensor classification method and a differential pressure flow sensor classification system, which can automatically classify differential pressure sensors according to the performance of a differential pressure-flow characteristic curve, and use the same type of differential pressure flow sensors in an instrument using the flow sensors at one time, thereby reducing the calibration difficulty.
One object of the present invention is to provide a differential pressure flow sensor classification method for classifying a plurality of differential pressure flow sensors, comprising the steps of: inputting fluid into a differential pressure flow sensor to be classified; adjusting the flow of the fluid, and collecting the pressure difference flowing through the throttling device of the differential pressure flow sensor to be classified under different flow rates; acquiring a characteristic curve to be classified, wherein the characteristic curve to be classified is a differential pressure-flow curve of a differential pressure flow sensor to be classified; and classifying the differential pressure sensor to be classified according to the characteristic curve to be classified.
Further, the method also comprises the step of compensating the characteristic curve to be classified to obtain a compensation characteristic curve to be classified, wherein the compensation coefficient of the compensation characteristic curve to be classified
Further, classifying the differential pressure sensor to be classified according to the characteristic curve to be classified further comprises the following steps: setting different classification levels of a plurality of differential pressure flow sensors, and determining a plurality of standard classification curves, wherein the standard classification curves refer to differential pressure-flow curves of the standard differential pressure flow sensors in each classification level; and comparing the compensation characteristic curve to be classified with a plurality of standard classification curves, and classifying the differential pressure sensor to be classified.
Further, the method for comparing the compensation characteristic curve to be classified with a plurality of standard classification curves comprises the following steps: the method for comparing the compensation characteristic curve to be classified with a plurality of standard classification curves comprises the following steps:
sequencing the differential pressure flow sensors to be classified and classification grades, determining a first differential pressure flow sensor to be classified as a current differential pressure flow sensor to be classified, and determining a first classification grade as a current classification grade;
calculating a variation coefficient c between a current compensation characteristic curve and a current standard classification curve, wherein the current compensation characteristic curve is a differential pressure-flow curve of a differential pressure flow sensor to be classified currently; the current standard classification curve is a standard classification curve of the current classification grade; the variation coefficient c = (sigma/rms) × 100%, the sigma is a standard deviation between a pressure difference value corresponding to each flow in the characteristic curve to be classified and a pressure difference value corresponding to the flow in the current standard classification curve, and the rms is an average value of differences between the pressure difference value corresponding to each flow in the characteristic curve to be classified and the pressure difference value corresponding to the flow in the current standard classification curve;
judging the relation between the variation coefficient and the variation threshold value; when the variation coefficient is larger than the variation threshold, taking the next standard classification curve as the current standard classification curve, and returning to calculate the variation coefficient c between the current compensation characteristic curve and the current standard classification curve; when the variation coefficient is smaller than or equal to the variation threshold value, determining that the current differential pressure flow sensor to be classified belongs to the current classification grade, and entering the next step; the variation threshold is determined according to grading requirements;
judging whether the current differential pressure flow sensor to be classified is the last differential pressure flow sensor to be classified; when the current differential pressure flow sensor to be classified is not the last differential pressure flow sensor to be classified, the next differential pressure flow sensor to be classified is the current differential pressure sensor to be classified, and the coefficient of variation c between the current compensation characteristic curve and the current standard classification curve is calculated; and finishing classification when the current differential pressure flow sensor to be classified is the last differential pressure flow sensor to be classified.
Further, the variation threshold is not greater than 15%.
A second object of the present invention is to provide a differential pressure flow sensor classification system for classifying a plurality of differential pressure flow sensors, the classification system comprising:
the flow control mechanism is used for controlling the input of fluid into the differential pressure flow sensor to be classified and controlling the flow of the fluid;
the differential pressure sensor is used for acquiring the differential pressure flowing through the throttling device of the differential pressure sensor to be classified under different flow rates in real time;
a processor;
and the storage medium is stored with a plurality of instructions, and when the instructions are executed by the processor, the processor receives the flow data regulated by the current flow control mechanism and the differential pressure data acquired by the differential pressure sensor, and determines a differential pressure-flow curve of the differential pressure sensor to be classified according to the flow data and the differential pressure data.
Further, a standard temperature sensor for detecting an ambient temperature around the differential pressure flow sensor;
a standard humidity sensor for detecting the ambient humidity around the differential pressure flow sensor;
the standard atmospheric pressure sensor is used for detecting the atmospheric pressure in the current environment;
the processor can also receive the temperature, the humidity and the atmospheric pressure in the current environment, and determine a compensation coefficient R of a differential pressure-flow characteristic curve according to the temperature, the relative humidity and the atmospheric pressure in the current environment and the temperature, the relative humidity and the atmospheric pressure in the standard working condition; the compensation coefficient
Furthermore, a plurality of standard classification curves are stored in the storage medium, wherein the standard classification curves refer to differential pressure-flow curves of standard differential pressure flow sensors in all classification levels; the classification grade refers to the classification of the differential pressure flow sensor according to actual needs; the processor compares the differential pressure-flow curve of the differential pressure flow sensor to be classified to a plurality of standard classification curves.
The invention automatically divides the differential pressure flow sensors with similar performance into the same type by obtaining the differential pressure-flow curve of the differential pressure flow sensor to be classified, and the differential pressure sensors of the same type are used in the instrument using the sensors at one time, so that the repeated calibration of the flow sensors can be avoided, and the fluid measurement is more convenient.
Drawings
FIG. 1 is a flow chart of a differential pressure flow sensor classification method in a first embodiment of the present invention.
FIG. 2 is a flow chart of a differential pressure flow sensor classification method in a second embodiment of the present invention.
Fig. 3 is a block diagram of a differential pressure flow sensor classification system according to a third embodiment of the invention.
Fig. 4 is a block diagram of a differential pressure flow sensor classification system according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, a first embodiment of the present invention provides a differential pressure flow sensor classification method for classifying a plurality of differential pressure flow sensors, including the following steps:
s11, inputting fluid into the differential pressure flow sensor to be classified;
s12, adjusting the flow of the fluid input into the differential pressure flow sensor to be classified, and acquiring the differential pressure flowing through the throttling device of the differential pressure flow sensor to be classified under different flow rates;
s13, acquiring a characteristic curve to be classified, wherein the characteristic curve to be classified is a differential pressure-flow curve of a differential pressure flow sensor to be classified;
and S2, classifying the differential pressure sensor to be classified according to the characteristic curve to be classified.
Because the differential pressure-flow curve can reflect the performance of the differential pressure flow sensor more intuitively, the differential pressure flow sensors with the performance similar to that of the differential pressure-flow curve are divided into the same type, and the flow sensors can be prevented from being repeatedly calibrated by using the differential pressure of the same type in the instrument using the sensors for one time, so that the fluid measurement is more convenient.
In the embodiment, fluid can be input into the differential pressure sensor to be classified through the flow control device, and the flow of the fluid can be adjusted according to actual requirements; the differential pressure flowing through the differential pressure flow sensor throttling device to be classified can be collected through a differential pressure sensor.
In this embodiment, preferably, the fluid input into the differential pressure sensor to be classified is a standard fluid. According to the scheme, the differential pressure measurement error can be effectively reduced, so that the classification result of the sensor to be classified is more stable.
Further, a second embodiment of the present invention provides a differential pressure flow sensor classification method, which, compared with the first embodiment, before step S2, further includes the following steps:
s14, collecting the ambient temperature, humidity and atmospheric pressure around the differential pressure flow sensor, and determining a compensation coefficient R of a characteristic curve to be classified; compensating the characteristic curve to be classified by adopting a compensation coefficient R to obtain a compensation characteristic curve to be classified; the compensation coefficientSaid P isWorker's toolAt ambient atmospheric pressure, said Pb workerIs the saturated vapor pressure of water under the current environment, phiWorker's toolAs ambient humidity, said tWorker's toolIs the ambient temperature, tSign boardFor the temperature under the standard working condition of the differential pressure sensor to be calibrated, PSign boardFor the atmospheric pressure under the standard working condition of the differential pressure sensor to be calibrated, the pressure Pb markIs the saturated vapor pressure of water under the standard working condition of the differential pressure sensor to be calibratedSign boardThe relative humidity under the standard working condition of the differential pressure sensor to be calibrated is obtained.
The scheme can compensate errors caused by the environmental conditions to the differential pressure-flow curve, so that the characteristic curve to be classified can reflect the performance of the differential pressure flow sensor to be classified more accurately.
Further, the step S2 includes the following steps:
s21, setting different classification levels of the differential pressure flow sensors, and determining a plurality of standard classification curves, wherein the standard classification curves refer to differential pressure-flow curves of the standard differential pressure flow sensors in each classification level;
and S22, comparing the compensation characteristic curve to be classified with a plurality of standard classification curves, and classifying the differential pressure sensor to be classified.
In this embodiment, as shown in fig. 2, the S22 includes the following steps:
s221, sequencing the differential pressure flow sensors to be classified and classification grades, determining that a first differential pressure flow sensor to be classified is a current differential pressure flow sensor to be classified, and determining that the first classification grade is the current classification grade;
s222, calculating a variation coefficient c between a current compensation characteristic curve and a current standard classification curve, wherein the current compensation characteristic curve is a differential pressure-flow curve of a differential pressure flow sensor to be classified currently; the current standard classification curve is a standard classification curve of the current classification grade; the variation coefficient c = (sigma/rms) × 100%, the sigma is a standard deviation between a pressure difference value corresponding to each flow in the characteristic curve to be classified and a pressure difference value corresponding to the flow in the current standard classification curve, and the rms is an average value of differences between the pressure difference value corresponding to each flow in the characteristic curve to be classified and the pressure difference value corresponding to the flow in the current standard classification curve;
s223, judging the relation between the variation coefficient and the variation threshold value; when the variation coefficient is greater than the variation threshold, the next classification level is the current classification level, and the step S222 is returned to; when the variation coefficient is not more than the variation threshold, determining that the current differential pressure flow sensor to be classified belongs to the current classification grade, and entering step S224; the variation threshold is determined according to grading requirements;
s224, judging whether the current differential pressure flow sensor to be classified is the last differential pressure flow sensor to be classified; when the current differential pressure flow sensor to be classified is not the last differential pressure flow sensor to be classified, the next differential pressure flow sensor to be classified is the current differential pressure sensor to be classified, and the step S222 is returned; and finishing classification when the current differential pressure flow sensor to be classified is the last differential pressure flow sensor to be classified.
Further, the fluid is a standard fluid. According to the scheme, the accurate detection result of the differential pressure flow sensor can be obtained, and the accuracy of the characteristic curve to be classified is improved.
Further, the difference in the coefficient of variation between two adjacent standard classification curves = variation threshold × 2. This scheme can carry out accurate classification to all differential pressure flow sensor, avoids same differential pressure flow sensor to classify to different classification levels in and cause the confusion.
It should be noted that the variation threshold is generally determined according to the performance of the differential pressure flow sensor, and the like, and preferably, the variation threshold is not greater than 15%. According to the scheme, the differential pressure flow sensors under the same classification level have better consistency.
As shown in fig. 3, a third embodiment of the present invention provides a differential pressure flow sensor classification system for classifying a plurality of differential pressure flow sensors, including:
the flow control mechanism is used for controlling the input of fluid into the differential pressure flow sensor to be classified and controlling the flow of the fluid;
the differential pressure sensor is used for acquiring the differential pressure flowing through the throttling device of the differential pressure sensor to be classified under different flow rates in real time;
a processor;
and the storage medium is stored with a plurality of instructions, and when the instructions are executed by the processor, the processor receives the flow data regulated by the current flow control mechanism and the differential pressure data acquired by the differential pressure sensor, and determines a differential pressure-flow curve of the differential pressure sensor to be classified according to the flow data and the differential pressure data.
The classification system provided by the embodiment is used for classifying a plurality of large-batch differential pressure flow sensors, the differential pressure flow sensors with the same or similar performance can be classified into the same classification level, the same type of differential pressure is used in the instrument of the disposable sensor, the flow sensors can be prevented from being repeatedly calibrated, and therefore fluid measurement is more convenient.
Further, the classification system further includes:
a reference temperature sensor for detecting an ambient temperature around the differential pressure flow sensor;
a standard humidity sensor for detecting the ambient humidity around the differential pressure flow sensor;
the standard atmospheric pressure sensor is used for detecting the atmospheric pressure in the current environment;
the processor can also receive the temperature, the humidity and the atmospheric pressure in the current environment, and determine a compensation coefficient R of a differential pressure-flow characteristic curve according to the temperature, the relative humidity and the atmospheric pressure in the current environment and the temperature, the relative humidity and the atmospheric pressure in the standard working condition; the compensation coefficient
Furthermore, a plurality of standard classification curves are stored in the storage medium, wherein the standard classification curves refer to differential pressure-flow curves of standard differential pressure flow sensors in all classification levels; the classification grade refers to the classification of the differential pressure flow sensor according to actual needs; the processor compares the differential pressure-flow curve of the differential pressure flow sensor to be classified to a plurality of standard classification curves.
Further, the classification system further comprises a display unit, and the display unit is used for displaying the classification result of the differential pressure sensor to be classified.
As shown in fig. 4, a fourth embodiment of the present invention provides a differential pressure flow sensor classification system, which is used for classifying a differential pressure flow sensor 1 to be classified; the difference from the third embodiment is that in this embodiment, the classification system further includes a flow control system 2, a differential pressure sensor 3, a standard temperature and humidity sensor 4, a standard atmospheric pressure sensor 5, an MCU 6, and an upper computer display system 7; the flow control system 2 comprises a cylinder 21, a motor 22 and a motor drive integrated control circuit 23, wherein the motor 22 is used for controlling the flow of the standard gas output by the cylinder 21; the differential pressure sensor 3 is used for collecting differential pressure flowing through the throttling device of the differential pressure flow sensor 1; the standard temperature and humidity sensor 4 is used for acquiring the ambient temperature and the ambient humidity around the differential pressure flow sensor 1; the standard atmospheric pressure sensor 5 is used for collecting the ambient atmospheric pressure around the differential pressure flow sensor 1; the MCU 6 is internally stored with a plurality of instructions, and when the instructions are executed, the MCU 6 controls the air cylinder 21 to output the flow of the standard gas through the motor drive integrated control circuit 23, receives the flow data of the standard gas, the differential pressure data collected by the differential pressure sensor, the environmental temperature data and the environmental humidity data collected by the standard temperature and humidity sensor and the environmental atmospheric pressure data collected by the standard atmospheric pressure sensor, processes the data according to the data to obtain the classification information of the differential pressure flow sensor to be detected, and displays the classification information through the upper computer display system 7.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
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