On-site rapid calibration method and system for high-performance ABS tuyere air volume testing device
By using portable standard airflow calibration kits to quickly calibrate high-performance ABS air outlet airflow testing devices on-site, the problems of long cycles and high costs in traditional calibration methods are solved, and efficient and accurate airflow measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-04-03
AI Technical Summary
In the existing technology, the on-site calibration of high-performance ABS air outlet air volume testing devices requires disassembly and delivery to the laboratory, resulting in long calibration cycles, high costs and cumbersome operations, which affects the continuity of testing work and the reliability of measurement data.
It adopts a portable standard air volume calibration component, which provides a traceable standard air volume output through a sealed connection to the device to be calibrated. It calculates the calibration coefficient and automatically stores it to achieve rapid on-site calibration, and supports multi-level measurement and environmental parameter compensation.
It enables on-site instant calibration, shortens the calibration cycle, reduces costs, improves equipment availability and the accuracy and reliability of measurement data, and ensures the continuity of testing work and the accuracy of calibration results.
Smart Images
Figure CN121783310A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ventilation and air conditioning system testing technology, specifically to a rapid on-site calibration method and system for a high-performance ABS air outlet airflow testing device. Background Technology
[0002] In cleanrooms, biomedical laboratories, data centers, and high-end electronics manufacturing workshops—places with stringent requirements for airflow organization—high-performance ABS air vents are crucial terminal devices for achieving precise air delivery and maintaining stable environmental parameters. Accurate measurement of their airflow directly impacts achieving cleanliness standards, controlling temperature and humidity uniformity, and rationally assessing system energy consumption. Currently, in engineering practice, portable airflow hoods, hot-wire anemometers, or differential pressure anemometers are commonly used for on-site airflow testing and commissioning of installed ABS air vents.
[0003] During use, the core sensing components of these field testing devices (such as hot-wire probes and differential pressure sensors) may experience drift in measurement accuracy due to factors such as environmental dust accumulation, physical aging, or accidental impacts. To ensure the long-term reliability of measurement data, these devices must be periodically calibrated to correct for systematic errors.
[0004] Traditional calibration methods involve disassembling the test equipment from the field and sending it to a qualified metrology laboratory for calibration using a large, fixed standard wind tunnel. This approach has several inherent drawbacks: First, the calibration cycle is lengthy, with the process of sending, queuing, testing, and retrieving the equipment typically taking weeks or even months, severely disrupting the continuity of on-site testing and debugging. Second, the economic costs are high, including explicit testing and transportation fees, and the potential need to rent or purchase spare equipment to meet on-site work needs while the equipment is away. Finally, the operation is extremely inconvenient; for large or highly integrated test equipment, the disassembly, packing, and transportation processes are cumbersome, and there is a risk of damage during transport.
[0005] Therefore, there is an urgent need in this field to develop technical solutions that can quickly and effectively calibrate air volume testing devices directly on-site in order to overcome the drawbacks of traditional laboratory calibration methods, such as long cycles, high costs, and cumbersome processes, and to ensure the efficient conduct of on-site testing and the timely and reliable measurement data. Summary of the Invention
[0006] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a rapid on-site calibration method and system for a high-performance ABS air outlet air volume testing device.
[0007] To achieve the above objectives, the innovative aspects of this invention are as follows: It includes the following steps:
[0008] S1: Prepare a portable standard airflow calibration kit that can provide a traceable standard airflow output;
[0009] S2: Connect the measuring probe or measuring surface of the airflow test device to be calibrated to the standard airflow output terminal of the portable standard airflow calibration kit in a sealed manner;
[0010] S3: Drives the portable standard airflow calibration unit to generate a stable airflow, operates the airflow testing device to measure the airflow, and obtains the on-site measurement value Q. 测 ;
[0011] S4: Obtain the standard airflow value Q corresponding to the portable standard airflow calibrator in the current state. 标 ;
[0012] S5: Based on standard air volume value Q 标 Compared with the on-site measured value Q 测 The calibration coefficient K used to correct the air volume test device is calculated.
[0013] S6: Input and store the calibration coefficient K in the processing unit of the air volume testing device so that the device can automatically apply the calibration coefficient in subsequent measurements.
[0014] Furthermore, the aforementioned portable standard airflow calibration device is a miniature adjustable wind tunnel, a standard fan unit, or a device integrating a standard flow nozzle.
[0015] Furthermore, in step S4, the standard air volume value Q 标 The data is obtained in real time by a high-precision flow meter integrated into a portable standard airflow calibration device.
[0016] Furthermore, in steps S3 and S5 above, the corresponding on-site measurement value Q is obtained at multiple different airflow output levels of the portable standard airflow calibration device. 测i Compared with the standard air volume value Q 标i To calculate a set of calibration coefficients K i Or a calibration curve.
[0017] Furthermore, in step S3 above, n repeated measurements are performed to obtain n on-site measurement values Q. 测j And calculate its average value Q. 测avg In step S5, Q is used. 测avg Calculate the calibration coefficient K, where n≥3.
[0018] Furthermore, step S6 above also includes: generating a calibration record on the airflow testing device that includes the calibration date and calibration coefficient K.
[0019] Furthermore, the above method also includes an environmental parameter compensation step: while performing step S3, the ambient temperature T is measured.meas and / or atmospheric pressure P meas In step S5, the standard air volume value Q is... 标 Compared with the on-site measured value Q 测 After converting to the same standard operating conditions, the calibration coefficient K is then calculated.
[0020] Furthermore, the aforementioned airflow testing device is a portable airflow hood, a hot-wire anemometer, or a differential pressure anemometer.
[0021] This invention provides a rapid on-site calibration system, comprising:
[0022] Portable standard airflow calibration kit for providing a known and traceable standard airflow;
[0023] A portable airflow testing device to be calibrated, comprising a processing unit and a measuring probe;
[0024] The data interaction unit is used to transmit the standard airflow value Q between the portable standard airflow calibration kit and the airflow testing device. 标 Compared with the on-site measured value Q 测 ;
[0025] The processing unit of the airflow testing device is configured to process the received Q signal. 标 With Q 测 Calculate and store the calibration coefficient K for automatic correction in subsequent measurements.
[0026] Furthermore, the data interaction unit includes a wireless communication module for wirelessly transmitting data between the portable standard airflow calibration device and the airflow testing device.
[0027] The technical effects and advantages of this invention are as follows:
[0028] 1. This invention achieves true on-site, real-time calibration, significantly improving calibration efficiency and reducing maintenance costs. By introducing portable standard airflow calibration components, this invention moves a traceable standard airflow source to the engineering site, allowing the airflow testing device to be calibrated to be calibrated on-site without disassembly or transport for testing. This method completely changes the traditional calibration model that must rely on a fixed laboratory, shortening the calibration cycle from weeks or even months to a short time that can be completed during on-site work breaks. It also avoids equipment transportation costs and the cost of spare equipment during off-site operations, significantly improving equipment availability and the continuity of on-site testing.
[0029] 2. The accuracy and long-term reliability of calibration results are guaranteed. The calibration method provided by this invention not only supports rapid single-point calibration but also generates calibration curves through multi-level measurements, thereby accurately compensating for nonlinear errors across the entire range of the testing device. Simultaneously, the method can include environmental parameter compensation steps, eliminating the influence of differences between on-site operating conditions and standard conditions. Calibration coefficients can be automatically stored and applied to all subsequent measurements, realizing intelligent calibration and automated correction, ensuring the accuracy and reliability of data measured by the testing device over long-term in complex on-site environments. Attached Figure Description
[0030] Figure 1 This is a flowchart of the on-site rapid calibration method of the present invention.
[0031] Figure 2 This is a schematic diagram showing the structural composition and connection relationship of the on-site rapid calibration system of the present invention.
[0032] Figure 3 This is a schematic cross-sectional view of the internal structure of a specific embodiment of the portable standard airflow calibration device of the present invention.
[0033] Figure 4 This is a schematic diagram illustrating the multi-level calibration and calibration curve generation process in this invention.
[0034] In the picture:
[0035] Portable standard airflow calibration kit 201, fan 202, rectifier section 203, high-precision standard flow meter 204, airflow testing device 205, measuring probe (air collection hood) 206, integrated processing display 207, data interaction unit 208, housing 301, variable frequency fan 302, rectifier grille 303, standard flow nozzle 304, differential pressure sensor 305, temperature and pressure sensor 306, touch screen display 307. Detailed Implementation
[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] Please see Figure 1 The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device provided in this embodiment of the invention includes the following steps:
[0038] S1: Prepare a portable standard airflow calibration kit. This calibration kit is a miniaturized, portable device whose core function is to generate a stable, known airflow with values traceable to national airflow standards. It can integrate a high-precision flow sensor or be calibrated in a high-level laboratory before leaving the factory to establish a precise correspondence between its motor speed, valve opening, and other control parameters and the output airflow.
[0039] S2: Connection. Connect the airflow test device to be calibrated (such as the air collection hood of an airflow hood) tightly to the standard airflow output end of the calibration piece using a flexible sealing ring or flange, ensuring no leakage.
[0040] S3: Measurement. Activate the calibration unit to output a stable airflow. Operate the airflow testing device to perform the measurement, read and record the displayed field measurement value Q. 测 .
[0041] S4: Obtain the standard value. Read the standard airflow value Q corresponding to the current output airflow from the display screen of the calibration device or the accompanying software. 标 This value can be measured in real time by an internal high-precision flow meter, or it can be a pre-calibrated set value.
[0042] S5: Calculate the calibration coefficient. Calculate the calibration coefficient K = Q 标 / Q 测 The coefficient K directly reflects the current measurement deviation of the testing device. To improve accuracy, measurements can be repeated more than three times at the same airflow point, and the result is taken as Q. 测 The average value is calculated.
[0043] S6: Apply calibration coefficient. Input the calculated K value into the processing unit (such as a microprocessor) of the testing device via the keyboard, Bluetooth, or data cable. The processing unit stores the K value in non-volatile memory and automatically multiplies the sensor's raw signal or calculated raw airflow value by K in all subsequent measurements to obtain and display the corrected final airflow value. Simultaneously, the system can automatically record the calibration date and K value, forming a calibration log.
[0044] Please see Figure 2 This paper demonstrates a rapid on-site calibration system according to an embodiment of the present invention. The system mainly includes: a portable standard airflow calibration component 201, which internally contains a fan 202, a rectifier section 203, and a high-precision standard flow meter 204; an airflow testing device 205 to be calibrated (shown as an airflow hood), which includes a measuring probe (air collection hood) 206 and a processing and display integrated unit 207; and a data interaction unit 208, here using a data cable as an example, connecting the calibration component 201 and the testing device 205, used to transmit the Q measured by the standard flow meter 204. 标The data is transmitted to the processing unit of the test device. It is understood that the data interaction unit 208 can also be implemented wirelessly, such as based on Bluetooth, Wi-Fi, or a proprietary wireless protocol, to further simplify on-site connection operations. The test device 205 will transmit the Q measured by itself... 测 With the received Q 标 The calibration coefficient K is obtained and applied through comparative calculations.
[0045] Please see Figure 3 This further illustrates an example structure of a specific portable standard airflow calibration device. It includes: a housing 301; a variable frequency fan 302 for providing power; an airflow stabilization chamber and a flow straightener 303 for shaping turbulent flow into a uniform and stable airflow; one or more standard flow nozzles 304 as precisely calibrated core throttling elements; a high-precision differential pressure sensor 305 and a temperature and pressure sensor 306 for measuring the pressure difference and gas properties before and after the nozzles, with an internal processor (not shown) calculating the accurate standard volumetric flow rate Q according to relevant standards (such as ISO 5167). 标 The touch display screen 307 is used to display standard flow values, setting parameters, and control start and stop.
[0046] In a preferred embodiment, to obtain a wider calibration range and improve linearity, the calibration method supports multi-point calibration. For example... Figure 4 As shown, the portable calibration device is controlled to output stable airflow at multiple fan speed levels (e.g., low, medium, and high). At each speed level i, the corresponding standard value Q is recorded. 标i and measured value Q 测i Calculate the calibration coefficient Ki = Q at this point. 标 i / Q 测i Ultimately, a set of calibration coefficients {K1, K2, K3} covering the measurement range can be obtained. The processing unit of the testing device can select the corresponding K value for correction based on the interval in which the current measurement value is located. Furthermore, these discrete points can be fitted to obtain a continuous calibration curve K = f(Q). 测 This enables precise correction across the entire measurement range.
[0047] In another embodiment, to eliminate the influence of environmental changes (especially air density) on airflow measurement, an environmental parameter compensation step is added to the method. During calibration measurement, the ambient temperature t is simultaneously measured using sensors built into the calibration piece or testing device. meas (Unit: °C) and atmospheric pressure P meas (Unit: kPa)
[0048] Before calculating the calibration coefficient K, first set the standard air volume value Q. 标 and the on-site measured value Q 测 All are converted to the same standard operating condition (for example, the standard operating condition is defined as: temperature T).std = 293.15K (corresponding to 20℃), absolute pressure is P std =101.325 kPa). Note during conversion: all temperature parameters must be in absolute temperature (Kelvin, K). If the ambient temperature is in Celsius, t... meas (°C), then the corresponding absolute temperature T meas =t meas +273.15(K).
[0049] The conversion formula is based on the ideal gas law, specifically:
[0050] Q 标,std =Q 标 ×(T std / T meas )×(P meas / P std )
[0051] Q 测,std =Q 测 ×(T std / T meas )×(P meas / P std )
[0052] In the formula:
[0053] Q 标,std and Q 测,std The standard air volume value converted to standard operating conditions and the on-site measured value must be in units of Q. 标 Q 测 Consistent (e.g., m) 3 / h).
[0054] T std Standard absolute temperature, T std =293.15K
[0055] T meas Absolute temperature at the scene, T meas =t meas +273.15(K), where t meas The temperature (°C) is measured on-site.
[0056] P std Standard absolute pressure, P std =101.325 kPa.
[0057] P meas Absolute atmospheric pressure measured on-site, unit: kPa.
[0058] The calibration coefficient K is then calculated using the converted value:
[0059] K = Q 标,std / Q 测,std
[0060] Note: After the above conversion, Q 标,std and Q 测,std Under the same standard operating conditions, the calculated calibration coefficient K has eliminated the influence of gas density differences caused by temperature and pressure changes, and is suitable for measurement correction under different environmental conditions.
[0061] After this environmental parameter compensation step, the K value is calculated again, which can eliminate the influence of gas density changes caused by the temperature and pressure differences between the field and standard operating conditions (or calibration environment of the calibration component), thereby ensuring the accuracy and universality of the calibration coefficient.
[0062] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.
[0063] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.
[0064] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A rapid on-site calibration method for a high-performance ABS air outlet airflow testing device, characterized in that: Includes the following steps: S1: Prepare a portable standard airflow calibration kit that can provide a traceable standard airflow output; S2: Connect the measuring probe or measuring surface of the airflow testing device to be calibrated to the standard airflow output terminal of the portable standard airflow calibration component in a sealed manner; S3: Drive the portable standard airflow calibration device to generate a stable airflow, operate the airflow testing device to measure the airflow, and obtain the on-site measurement value Q. 测 ; S4: Obtain the standard airflow value Q corresponding to the portable standard airflow calibrator in the current state. 标 ; S5: Based on the standard air volume value Q 标 With the on-site measured value Q 测 The calibration coefficient K used to correct the air volume testing device is calculated. S6: Input and store the calibration coefficient K in the processing unit of the air volume testing device so that the device can automatically apply the calibration coefficient in subsequent measurements.
2. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 1, characterized in that: The portable standard airflow calibration device is a miniature adjustable wind tunnel, a standard fan unit, or a device integrating a standard flow nozzle.
3. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 2, characterized in that: In step S4, the standard air volume value Q 标 The flow rate is measured in real time by a high-precision flow meter integrated inside the portable standard airflow calibration device.
4. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 1, characterized in that: In steps S3 and S5, the corresponding on-site measurement value Q is obtained at multiple different airflow output levels of the portable standard airflow calibration device. 测i Compared with the standard air volume value Q 标i To calculate a set of calibration coefficients K i Or a calibration curve.
5. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 1 or 4, characterized in that: In step S3, n repeated measurements are performed to obtain n on-site measurement values Q. 测j And calculate its average value Q. 测avg In step S5, Q is used. 测avg Calculate the calibration coefficient K, where n≥3.
6. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 1, characterized in that: Step S6 further includes: generating a calibration record on the airflow testing device that includes the calibration date and the calibration coefficient K.
7. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 1, characterized in that: The method further includes an environmental parameter compensation step: while performing step S3, the ambient temperature T is measured. meas and / or atmospheric pressure P meas In step S5, the standard air volume value Q is... 标 With the on-site measured value Q 测 After uniformly converting to the same standard operating conditions, the calibration coefficient K is then calculated.
8. The on-site rapid calibration method for the high-performance ABS air outlet air volume testing device according to claim 1, 4 or 7, characterized in that: The air volume testing device is a portable air volume hood, a hot-wire anemometer, or a differential pressure anemometer.
9. A field rapid calibration system for performing the method of claim 1, characterized in that: include: Portable standard airflow calibration kit for providing a known and traceable standard airflow; A portable airflow testing device to be calibrated, comprising a processing unit and a measuring probe; The data interaction unit is used to transmit the standard airflow value Q between the portable standard airflow calibrator and the airflow testing device. 标 With the on-site measured value Q 测 ; The processing unit of the airflow testing device is configured to be based on the received Q 标 With Q 测 Calculate and store the calibration coefficient K for automatic correction in subsequent measurements.
10. The on-site rapid calibration system according to claim 9, characterized in that: The data interaction unit includes a wireless communication module for wirelessly transmitting data between the portable standard airflow calibration device and the airflow testing device.