Mass flow metering device and mass flow metering system

Abstract

The invention relates to the technical field of mass flow metering, in particular to a mass flow metering device and a mass flow metering system, which comprise a fluid guide unit, a detection unit and a processing unit. The fluid guide unit guides to-be-measured fluid to form a stable flow field; the detection unit is used for acquiring fluid speed and pressure distribution information through a multi-sensor array and generating a detection signal; the processing unit parses the signal based on an algorithm model to determine a mass flow value. Geometric parameters of the flow channel are optimally designed according to a Reynolds number range and target precision, and meanwhile, a preset correction coefficient and a compensation constant are introduced to improve the measurement precision. The invention further provides a calibration unit and a signal shielding unit, and the adaptability to complex working conditions is enhanced. The structure is simplified, the operation complexity is reduced, meanwhile, high-precision measurement is achieved, and the method is suitable for various industrial scenes.

Description

Technical Field

[0001] The present invention belongs to the technical field of flow measurement, and specifically relates to a mass flow metering device and a mass flow metering system. Background Art

[0002] With the rapid development of industrial automation and precision measurement technology, mass flow metering devices and systems are increasingly widely used in fields such as chemical industry, energy, and environmental protection. However, the existing mass flow metering devices and systems still have certain deficiencies in terms of measurement accuracy, response speed, and the ability to adapt to complex working conditions, which affect their efficient application in actual engineering.

[0003] In the prior art, the patent with the publication number CN106679770B provides a mass flowmeter calibration system that works in coordination with a calibration solution device, a solution pump, an actuator switch, a standard meter, a computer, and an electronic scale, significantly improving the calibration accuracy and efficiency of the mass flowmeter. However, this technical solution has high requirements for the calibration environment, and the calibration process depends on a variety of external devices (such as a calibration solution device, a solution pump, an electronic scale, etc.), resulting in a complex system structure and difficulty in achieving on-site rapid calibration. In addition, the adaptability of this solution to different media is limited, and there may be limitations when dealing with high-temperature, high-pressure, or corrosive media, affecting its applicability in complex working conditions. Another prior art, the patent with the publication number CN113588048B, through the combination of a volume flowmeter and a mass flowmeter, realizes the accurate monitoring of the mass flow of liquid fuel by using volume / mass conversion, ensuring the safety and controllability of the test process. However, the calibration process of this technical solution requires the collection and weighing of the discharged calibration liquid, and indirectly obtains the mass flow through complex volume conversion, with cumbersome operation steps and easy introduction of human errors. In addition, this method has high requirements for the accurate measurement of liquid density. If the density measurement is inaccurate, it will directly affect the final mass flow calculation result, thereby reducing the overall measurement accuracy of the system.

[0004] The above problems indicate that the existing mass flow metering devices and systems still have certain deficiencies in simplifying the calibration process, improving measurement accuracy, enhancing adaptability to complex working conditions, and reducing human errors. Therefore, there is an urgent need for a new type of mass flow metering device and mass flow metering system to optimize the calibration process, improve measurement accuracy, enhance the ability to adapt to complex working conditions, and reduce the influence of human errors, so as to meet the requirements of modern industry for efficient and accurate mass flow metering. Summary of the Invention

[0005] The present invention provides a mass flow measurement device and a mass flow measurement system, which can realize a mass flow measurement device and system with simplified structure, convenient operation, high measurement accuracy and adaptability to complex working conditions. According to a first aspect of the present invention, a mass flow measurement device is provided. The device includes: a fluid guiding unit configured to guide a fluid to be measured into and form a stable flow field; a detection unit configured to receive the fluid from the fluid guiding unit via a flow channel and generate a detection signal based on the dynamic characteristics of the fluid; and a processing unit configured to receive the detection signal from the detection unit and analyze the detection signal through an algorithm model to determine a mass flow value, wherein the geometric parameters of the flow channel are optimized based on the Reynolds number range of the fluid and the target measurement accuracy.

[0006] In some embodiments, the detection unit is configured to: collect velocity distribution information of the fluid along a first direction via a multi-sensor array in the detection unit; and collect pressure distribution information of the fluid along a second direction, wherein the first direction is perpendicular to the second direction. In some embodiments, the detection unit includes: a sensing part configured to form a first part of the multi-sensor array for collecting dynamic characteristics of the fluid along the first direction and the second direction; and a calculation module configured to form a second part of the multi-sensor array for generating a detection signal based on the collected dynamic characteristics, and the calculation module has a preset correction coefficient for compensating and correcting the detection signal according to the preset correction coefficient.

[0007] In some embodiments, the geometric parameters of the flow channel are further determined based on at least one of the following items: the preset correction coefficient, the sensitivity of the sensing part, the predetermined measurement error rate of the device, or the predetermined response time of the device, wherein the predetermined measurement error rate is determined based on the following items: the deviation of the fluid dynamic characteristics collected by the detection unit, and the deviation of the mass flow value analyzed by the processing unit, and wherein the predetermined response time is determined based on the following items: the time interval for the detection unit to collect dynamic characteristics, and the time interval for the processing unit to analyze the detection signal.

[0008] In some embodiments, the detection unit is further configured to: transmit interference signals generated by the turbulence effect in the fluid to the calculation module via the sensing part, so that the interference signals are filtered to generate a corrected detection signal.

[0009] In some embodiments, the device further includes: a signal shielding unit configured to be electrically coupled to the detection unit and the processing unit for shielding the influence of external electromagnetic interference on the detection signal.

[0010] In some embodiments, the fluid guiding unit is further configured to guide a reference fluid into the unit. The physical properties of the reference fluid are different from those of the fluid to be measured. The detection unit is further configured to: receive the reference fluid from the fluid guiding unit via the flow channel and generate a reference signal based on the dynamic characteristics of the reference fluid. The device further includes a calibration unit configured to receive the reference signal from the detection unit via the processing unit for calibrating the measurement accuracy of the detection unit according to the reference signal.

[0011] In some embodiments, the fluid guiding unit includes: an inlet pipe configured to transport the fluid to be measured; and a flow straightener configured to straighten the fluid to be measured to form a stable flow field.

[0012] In some embodiments, the detection unit includes: a sensing part including a first piezoelectric sensor, a second piezoelectric sensor, and a third piezoelectric sensor. The first piezoelectric sensor is configured to have the flow channel, and the first piezoelectric sensor is electrically coupled to the flow straightener via the flow channel. The second piezoelectric sensor is electrically coupled to the first piezoelectric sensor, and the third piezoelectric sensor is electrically coupled to the second piezoelectric sensor; and a signal processing module including a first operational amplifier and a second operational amplifier. The first operational amplifier is electrically coupled to the third piezoelectric sensor, and the second operational amplifier is electrically coupled to the first operational amplifier and the processing unit. Among them, the interference signal generated by the turbulence effect in the fluid is transmitted to the signal processing module via the second piezoelectric sensor and the third piezoelectric sensor.

[0013] In some embodiments, the processing unit includes: a first filter configured to be electrically coupled to the first operational amplifier; a first analog-to-digital converter configured to be electrically coupled to the first filter; a first processor configured to be electrically coupled to the first analog-to-digital converter; and a display module configured to be electrically coupled to the first processor.

[0014] In some embodiments, the device further includes a calibration unit. The calibration unit includes: a fourth piezoelectric sensor configured to be electrically coupled to the first operational amplifier; a second filter configured to be electrically coupled to the fourth piezoelectric sensor; a second analog-to-digital converter configured to be electrically coupled to the second filter; and a storage module configured to be electrically coupled to the second analog-to-digital converter.

[0015] In some embodiments, the fluid to be measured and the reference fluid have the same temperature range, and the other device is the same as the device. According to the second aspect of the present invention, a mass flow measurement system is further provided. The system includes the device according to the first aspect of the present invention and another device. It should be understood that the beneficial effects of the present invention are as follows: By configuring a detection unit that can be used to collect velocity distribution information and pressure distribution information simultaneously with optimized flow channel geometric parameters, and by setting a preset correction coefficient of the detection unit according to the dynamic characteristics of the fluid, the structure of the device can be simplified, the operation complexity of the device can be reduced, and at the same time, the device has high measurement accuracy and adaptability to complex working conditions.

[0016] To achieve the above functions, the present invention proposes a mass flow calculation method based on multi-sensor data fusion, and its core formula is as follows:

[0017]

[0018] Where Q m represents the mass flow value, K represents the preset correction coefficient, ρ

[0019] represents the fluid density, V represents the fluid velocity vector, n represents the normal vector of the flow channel surface, A

[0020] represents the cross-sectional area of the flow channel, and C represents the compensation constant. The integral term in the formula is used to calculate the total momentum flux of the fluid in the flow channel, and the preset correction coefficient K is obtained through regression analysis of experimental data, ensuring the accuracy of the calculation result. The introduction of the compensation constant C is used to eliminate the systematic error caused by the fluid turbulence effect, thereby further improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic structural diagram of a mass flow measurement device provided by an embodiment of the present invention, showing the connection relationship and main components of a fluid guiding unit, a detection unit, and a processing unit.

[0022] Figure 2 FIG. is a detailed structural diagram of the detection unit in an embodiment of the present invention, including the arrangement mode of a multi-sensor array and the electrical connection relationship between a signal processing module and an operational amplifier.

[0023] Figure 3 FIG. is a block diagram of the composition of a mass flow measurement system provided by an embodiment of the present invention, showing the cooperation relationship between two devices in the system and the signal transmission path. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention provides a mass flow metering device and a mass flow metering system, and its structural design, signal acquisition and processing methods, as well as the overall operation process, are all carried out around the goals of achieving high measurement accuracy, simplifying operation, and adapting to complex working conditions. The following will be combined with attached Figure 1 to attached Figure 3 to elaborate in detail on the specific implementation manners of the present invention.

[0025] As Figure 1 shown, the device of the present invention mainly consists of a fluid guiding unit 100, a detection unit 200, and a processing unit 300. The fluid guiding unit 100 includes an inlet pipe 110 and a rectifier 120. The inlet pipe 110 is used to transport the fluid to be measured, while the rectifier 120 rectifies the received fluid to form a stable flow field. The design of the rectifier 120 takes into account the Reynolds number range of the fluid and the target measurement accuracy, and ensures a uniform velocity distribution and pressure distribution of the fluid before entering the detection unit 200 by optimizing the geometric parameters. This design significantly reduces the interference of turbulent effects on the subsequent measurement process and provides more reliable input conditions for the detection unit 200. In addition, the fluid guiding unit 100 can also guide a reference fluid into the device. The physical properties of the reference fluid are different from those of the fluid to be measured, and it is used to generate a reference signal to calibrate the measurement accuracy of the detection unit 200.

[0026] The detection unit 200 is the core part of this device, and its structure is as Figure 2As shown in the figure. The detection unit 200 includes a sensing part 210 and a signal processing module 220. The sensing part 210 is composed of a multi-sensor array, and these sensors are arranged along the first direction and the second direction, respectively used to collect the velocity distribution information and pressure distribution information of the fluid. The first direction and the second direction are perpendicular to each other, thus ensuring a comprehensive capture of the dynamic characteristics of the fluid. The first piezoelectric sensor 211, the second piezoelectric sensor 212, and the third piezoelectric sensor 213 in the sensing part 210 are electrically coupled in sequence to form a complete signal transmission path. The first piezoelectric sensor 211 is directly connected to the flow channel, receives the fluid from the fluid guiding unit 100, and converts its dynamic characteristics into electrical signals. The second piezoelectric sensor 212 and the third piezoelectric sensor 213 further process the signals and transmit the interference signals generated by the turbulent effect in the fluid to the signal processing module 220. The signal processing module 220 includes a first operational amplifier 221 and a second operational amplifier 222. The first operational amplifier 221 is electrically coupled to the third piezoelectric sensor 213, and the second operational amplifier 222 is electrically coupled to the first operational amplifier 221 and the processing unit 300. The function of the signal processing module 220 is to filter and amplify the signals output by the sensing part 210 to eliminate noise and improve the signal-to-noise ratio of the signals. In addition, the signal processing module 220 also has a preset correction coefficient, which is obtained through regression analysis of experimental data and is used to compensate and correct the detection signals, thereby further improving the measurement accuracy.

[0027] The processing unit 300 is responsible for receiving the detection signal from the detection unit 200 and analyzing the signal through an algorithm model to determine the mass flow rate value. As Figure 3 shown, the processing unit 300 includes a first filter 310, a first analog-to-digital converter 320, a first processor 330, and a display module 340. The first filter 310 is electrically coupled to the first operational amplifier 221 and is used to further filter the signal to remove residual high-frequency noise. The first analog-to-digital converter 320 is electrically coupled to the first filter 310 and converts the analog signal into a digital signal for subsequent processing. The first processor 330 is electrically coupled to the first analog-to-digital converter 320 and executes the core algorithm to analyze the digital signal. The analysis process is based on the following formula:

[0028]

[0029] where, Q m represents the mass flow rate value, K represents the preset correction coefficient, ρ represents the fluid density, V

[0030] represents the fluid velocity vector, n represents the normal vector of the flow channel surface, A represents the cross-sectional area of the flow channel, C

[0031] It represents a compensation constant. The integral term in the formula is used to calculate the total momentum flux of the fluid in the flow channel, while the preset correction coefficient K is obtained through regression analysis of experimental data, ensuring the accuracy of the calculation results. The introduction of the compensation constant C is used to eliminate the systematic error caused by the fluid turbulence effect, thereby further improving the measurement accuracy. The mass flow rate value calculated by the first processor 330 is finally presented to the user through the display module 340.

[0032] To further improve the measurement accuracy and reliability of the device, the present invention further includes a calibration unit 400. The calibration unit 400 is as Figure 3 shown, and includes a fourth piezoelectric sensor 410, a second filter 420, a second analog-to-digital converter 430, and a storage module 440. The fourth piezoelectric sensor 410 is electrically coupled to the first operational amplifier 221 and is used to receive the dynamic characteristic signal of the reference fluid. The second filter 420 is electrically coupled to the fourth piezoelectric sensor 410 and filters the reference signal. The second analog-to-digital converter 430 is electrically coupled to the second filter 420 and converts the analog signal into a digital signal. The storage module 440 is electrically coupled to the second analog-to-digital converter 430 and is used to store the reference signal and related calibration data. The function of the calibration unit 400 is to calibrate the measurement accuracy of the detection unit 200 according to the reference signal, thereby ensuring that the device maintains a high measurement accuracy during long-term use.

[0033] In addition, the present device further includes a signal shielding unit 500. The signal shielding unit 500 is electrically coupled to the detection unit 200 and the processing unit 300 and is used to shield the influence of external electromagnetic interference on the detection signal. The design of the signal shielding unit 500 fully considers the complex electromagnetic environment in the industrial field and adopts multi-layer shielding materials and grounding technologies, effectively reducing the influence of external interference on the signal quality.

[0034] In actual application scenarios, the device of the present invention can be used for mass flow measurement under various complex working conditions. For example, in the petrochemical industry, the fluid to be measured may have characteristics such as high temperature, high pressure, or corrosiveness. By optimizing the geometric parameters of the flow channel and adopting multi-sensor data fusion technology, this device can maintain a high measurement accuracy under these extreme conditions. Specifically, when the fluid to be measured enters the device through the inlet pipe 110, the rectifier 120 rectifies it to form a stable flow field. Subsequently, the fluid enters the detection unit 200, and the sensing part 210 collects the velocity distribution information and pressure distribution information of the fluid along the first direction and the second direction. After being filtered and amplified by the signal processing module 220, these information are transmitted to the processing unit 300. The processing unit 300 analyzes the signals according to the core algorithm, calculates the mass flow value, and presents it to the user through the display module 340. At the same time, the calibration unit 400 regularly calibrates the detection unit 200 using the reference signal generated by the reference fluid to ensure that the measurement accuracy of the device always remains at a high level.

[0035] The system of the present invention, as Figure 3 shown, includes two identical devices, namely device A and device B. Device A and device B cooperate through a signal transmission path. One device serves as the main device for real-time measurement, and the other device serves as a backup device for calibration and verification. This dual-device configuration not only improves the reliability of the system but also significantly enhances its adaptability under complex working conditions. For example, in an actual application in a chemical plant, device A is used to monitor the mass flow of a certain chemical reagent on the production line, while device B regularly calibrates device A using the reference signal generated by the reference fluid. In this way, the system can maintain a high measurement accuracy and stability during long-term operation.

[0036] In summary, through optimizing the geometric parameters of the flow channel, adopting multi-sensor data fusion technology, and introducing preset correction coefficients and compensation constants, the present invention realizes a mass flow metering device and system with simplified structure, convenient operation, high measurement accuracy, and adaptability to complex working conditions. Its operating principle and process are clear and definite, which can meet the requirements of various application scenarios, especially suitable for the accurate measurement of high-temperature, high-pressure, or corrosive fluids.

Claims

1. A mass flow metering device, characterized in that, Comprising: A fluid guiding unit (100) configured to guide a fluid to be measured to enter and form a stable flow field; A detection unit (200) configured to receive the fluid from the fluid guiding unit (100) via a flow channel and generate a detection signal based on the dynamic characteristics of the fluid; and a processing unit (300) configured to receive the detection signal from the detection unit (200) and analyze the detection signal through an algorithm model to determine a mass flow rate value, wherein the geometric parameters of the flow channel are optimized and designed based on the Reynolds number range of the fluid and the target measurement accuracy.

2. The device according to claim 1, characterized in that The detection unit (200) is configured to: collect velocity distribution information of the fluid along a first direction via a multi-sensor array in the detection unit (200); and collect pressure distribution information of the fluid along a second direction, the first direction being perpendicular to the second direction.

3. The device according to claim 2, characterized in that The detection unit (200) includes: a sensing part (210) configured to form a first part of the multi-sensor array for collecting dynamic characteristics of the fluid along the first direction and the second direction; and a calculation module (220) configured to form a second part of the multi-sensor array for generating a detection signal based on the collected dynamic characteristics, the calculation module (220) having a preset correction coefficient for compensating and correcting the detection signal according to the preset correction coefficient.

4. The device according to claim 3, characterized in that, The geometric parameters of the flow channel are further determined based on at least one of the following: the preset correction coefficient, the sensitivity of the sensing part (210), the predetermined measurement error rate of the device, or the predetermined response time of the device, wherein the predetermined measurement error rate is determined based on: the deviation of the fluid dynamic characteristics collected by the detection unit (200), and the deviation of the mass flow rate value analyzed by the processing unit (300), and wherein the predetermined response time is determined based on: the time interval for the detection unit (200) to collect dynamic characteristics, and the time interval for the processing unit (300) to analyze the detection signal.

5. The device according to claim 3, characterized in that, The detection unit (200) is further configured to: transmit interference signals generated by turbulent effects in the fluid to the calculation module (220) via the sensing part (210) so that the interference signals are filtered to generate a corrected detection signal.

6. The device according to claim 1, characterized in that Further comprising: A signal shielding unit (500) configured to be electrically coupled to the detection unit (200) and the processing unit (300) for shielding the influence of external electromagnetic interference on the detection signal.

7. The device according to claim 1, characterized in that The fluid guiding unit (100) is further configured to guide a reference fluid into the device, the physical properties of the reference fluid being different from those of the fluid to be measured. The detecting unit (200) is further configured to: receive the reference fluid from the fluid guiding unit (100) via the flow channel and generate a reference signal based on the dynamic characteristics of the reference fluid. The device further includes a calibration unit (400) configured to receive the reference signal from the detecting unit (200) via the processing unit (300) for calibrating the measurement accuracy of the detecting unit (200) according to the reference signal.

8. The device according to claim 1, characterized in that The fluid guiding unit (100) includes: an inlet pipe (110) configured to transport the fluid to be measured; and a rectifier (120) configured to rectify the fluid to be measured to form a stable flow field.

9. The device according to claim 3, characterized in that The sensing part (210) includes a first piezoelectric sensor (211), a second piezoelectric sensor (212) and a third piezoelectric sensor (213). The first piezoelectric sensor (211) is configured to have the flow channel, and the first piezoelectric sensor (211) is electrically coupled to the rectifier (120) via the flow channel. The second piezoelectric sensor (212) is electrically coupled to the first piezoelectric sensor (211), and the third piezoelectric sensor (213) is electrically coupled to the second piezoelectric sensor (212). The signal processing module (220) includes a first operational amplifier (221) and a second operational amplifier (222). The first operational amplifier (221) is electrically coupled to the third piezoelectric sensor (213), and the second operational amplifier (222) is electrically coupled to the first operational amplifier (221) and the processing unit (300). The interference signal generated by the turbulence effect in the fluid is transmitted into the signal processing module (220) via the second piezoelectric sensor (212) and the third piezoelectric sensor (213).

10. A mass flow measurement system, characterized in that, Comprising the device according to any one of claims 1 to 9 and another device.

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