Device and method for detecting performance efficiency of high-voltage electronic fan

Abstract

The invention discloses a performance efficiency detection device of a high-voltage electronic fan and a detection method thereof. The performance efficiency detection device comprises a wind tunnel test device, a detected fan, a control driving assembly and a detection element. The wind tunnel test device simulates a complex airflow environment through an auxiliary fan, a wind tunnel bin, a nozzle air volume detection plate and an air valve. The control driving assembly achieves flexible control over rotation of a fan motor through a low-voltage power source, a high-voltage power source, a motor driver and an intelligent terminal. The detection element comprises a differential pressure sensor, a static pressure sensor, a total pressure sensor, a power meter and a rotating speed sensor and is used for synchronously detecting multiple parameters and transmitting data to an intelligent terminal. The device can accurately simulate actual airflow resistance, multi-parameter synchronous detection is achieved, and the accuracy and reliability of a detection result are effectively improved. An air flow environment can be simulated by highly fitting an actual working scene, and a reliable basis is provided for fan performance evaluation; omnibearing and accurate multi-parameter synchronous detection is realized, and the limitation of the prior art is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical performance testing, and in particular to a performance efficiency detection device and a detection method for a high-voltage electronic fan. Background Art

[0002] In the field of thermal management systems for new energy commercial vehicles today, the performance efficiency of high-voltage electronic fans plays a vital role in ensuring the stable operation of the vehicle. In particular, as new energy heavy trucks develop towards the use of hydrogen energy, their internal heat dissipation needs are becoming increasingly severe. Using high-voltage electronic fans to reduce the space volume of the cooling system and improve performance efficiency at the same time has become an urgent need. Therefore, accurately detecting the performance efficiency of high-voltage electronic fans has become a key link in optimizing the design of the cooling system and improving the overall performance of thermal management of new energy commercial vehicles.

[0003] At present, the air volume hood direct measurement method is a common means for detecting the exhaust efficiency of electronic fans. This method covers the air volume hood on the fan outlet, uses the built-in anemometer to directly measure the air velocity, and calculates the air volume in combination with the outlet area. However, this method has many obvious shortcomings. In an actual cooling system, the airflow needs to overcome a variety of airflow resistances such as radiator grilles and pipe bends, and the air volume hood direct measurement method cannot simulate the airflow resistance conditions in these actual working conditions, resulting in a large deviation between the test results and the performance of the electronic fan in the actual working environment, and it is difficult to accurately reflect the exhaust efficiency of the fan in actual applications. In addition, the air volume hood direct measurement method can only obtain a single air volume parameter, and cannot simultaneously detect other key parameters such as static pressure, dynamic pressure, and motor power, which makes the evaluation of fan efficiency lack of comprehensiveness and accuracy, and it is difficult to meet the needs of modern cooling systems for accurate evaluation of fan performance.

[0004] Moreover, the traditional wind tunnel testing method has poor adaptability, is not optimized for the high speed and low flow characteristics of high-voltage electronic fans, and lacks dynamic control.

[0005] In summary, the existing electronic fan exhaust efficiency detection methods have serious defects in simulating real working conditions and comprehensively detecting key parameters. There is an urgent need for a high-voltage electronic fan exhaust efficiency detection device that can effectively simulate actual airflow resistance and realize multi-parameter synchronous detection to improve the accuracy and reliability of the detection results. Summary of the invention

[0006] In view of the deficiencies in the background technology, the present invention provides a performance efficiency detection device and a detection method for a high-voltage electronic fan.

[0007] The technical solution adopted by the present invention is: a performance efficiency detection device for a high-voltage electronic fan, comprising a wind tunnel test device, a fan to be tested, a control drive component and a detection element;

[0008] The wind tunnel test device comprises an auxiliary fan, a wind tunnel chamber, an air valve and a nozzle air volume detection plate. One end of the wind tunnel chamber is connected to the air outlet pipe of the auxiliary fan, and the fan to be tested is fixedly installed on the other end. The auxiliary fan provides airflow for the wind tunnel chamber. The nozzle air volume detection plate is located in the wind tunnel chamber, and a plurality of nozzles are arranged on the nozzle air volume detection plate.

[0009] The control drive component includes a low-voltage power supply, a high-voltage power supply, a motor driver and an intelligent terminal. The low-voltage power supply or the high-voltage power supply is connected to the fan under test to provide power for the fan under test. The intelligent terminal is connected to the fan under test through the motor driver, and the intelligent terminal is used to control the rotation of the motor of the fan under test.

[0010] The detection elements are all connected to the intelligent terminal and transmit the measured data to the intelligent terminal. The detection elements include a pressure difference sensor for detecting the air pressure difference in the space on both sides of the nozzle air volume detection plate, a static pressure sensor for detecting static pressure, a total pressure sensor for detecting total pressure, a power meter for detecting the motor power of the fan under test, and a speed sensor for detecting the fan under test.

[0011] Furthermore, the air valve is arranged on the air outlet pipe of the auxiliary fan.

[0012] Furthermore, flow stabilizing nets are provided in the wind tunnel chambers on both sides of the nozzle air volume detection plate.

[0013] Furthermore, nozzle mounting holes for mounting nozzles are arranged in a "nine-square grid" form on the nozzle air volume detection plate.

[0014] Furthermore, the intelligent terminal has a built-in data analysis module, which can generate a static pressure-flow curve, a power-flow curve, an efficiency-flow curve and a data table of the tested fan according to the data transmitted by the detection element, and compare and analyze them with preset performance indicators.

[0015] Furthermore, the power meter is connected in series between the high-voltage power supply and the motor driver to monitor the input power of the fan under test in real time and synchronize the data to the smart terminal.

[0016] Furthermore, a sealing flange is provided at the interface between the wind tunnel chamber and the auxiliary fan and the fan under test, and a rubber gasket is embedded inside the flange to ensure air tightness.

[0017] The present application also provides a method for testing the exhaust efficiency of a high-voltage electronic fan, comprising the following steps:

[0018] Step S1, parameter initialization:

[0019] Install the fan to be tested at the end of the wind tunnel chamber, connect the high / low voltage power supply and detection elements, and set the target speed, air valve opening and initial value of auxiliary fan speed on the intelligent terminal;

[0020] Step S2: working condition simulation and data collection:

[0021] Start the auxiliary fan and the fan under test, and simulate the static pressure environment under different system resistances by adjusting the air valve opening and the auxiliary fan speed;

[0022] The pressure difference, static pressure and total pressure values ​​on both sides of the nozzle air volume detection plate are collected in real time through the pressure difference sensor, static pressure sensor and total pressure sensor;

[0023] Synchronously record the motor power detected by the power meter and the speed data fed back by the speed sensor;

[0024] Step S3: Dynamic characteristics analysis:

[0025] The intelligent terminal calculates the actual air volume (Q) and dynamic pressure (P d) based on the collected data, where:

[0026]

[0027] (k is the nozzle flow coefficient, ΔP is the differential pressure sensor reading, and A is the total nozzle area);

[0028] P d = 0.5*ρ*V2 (ρ is air density, V is air velocity), generating static pressure-flow curve, power-efficiency curve and total pressure-speed curve;

[0029] The air flow velocity V is determined by the following formula:

[0030]

[0031] Step S4: Performance verification and optimization:

[0032] Compare the measured curve with the preset performance indicators to determine the fan's exhaust efficiency, maximum static pressure bearing capacity and energy efficiency level;

[0033] If the result does not meet the standard, adjust the motor drive parameters or fan structure and repeat steps S1-S3.

[0034] Furthermore, in step S2, by adjusting the opening and closing combination of the nine nozzles, refined graded control of the air volume is achieved, and the change in air volume at each level does not exceed 4-8% of the total air volume.

[0035] Further, in step S3, the intelligent terminal calculates the fan efficiency (η) by the following formula:

[0036]

[0037] (Q is the air volume, Ps is the detection value of the static pressure sensor, and Pinput is the input power detected by the power meter).

[0038] The beneficial effects of the present invention are:

[0039] 1. In terms of simulating real working conditions, this device simulates the complex airflow environment in the actual cooling system through a wind tunnel test device. The auxiliary fan is connected to one end of the wind tunnel chamber, and the fan to be tested is installed at the other end. The auxiliary fan provides stable airflow for the wind tunnel chamber. The nozzle air volume detection plate is located in the wind tunnel chamber, and multiple nozzles are set on the wind tunnel chamber, which can accurately simulate the airflow resistance caused by radiator grilles, pipe bends, etc., so that the test environment is highly consistent with the actual working scene, greatly improving the accuracy of the test results, and providing a reliable basis for the performance evaluation of high-voltage electronic fans in real applications.

[0040] 2. From the perspective of multi-parameter synchronous detection, the differential pressure sensor can accurately detect the air pressure difference in the space on both sides of the nozzle air volume detection plate. The static pressure sensor and total pressure sensor measure the static pressure and total pressure (dynamic pressure and static pressure) respectively. The power meter is used to detect the motor power of the fan under test. The speed sensor monitors the fan speed in real time. All detection components are connected to the smart terminal to transmit the measured data to the smart terminal synchronously. This multi-parameter synchronous detection method enables operators to fully understand the performance of the fan under different working conditions, providing rich and accurate data support for the comprehensive evaluation of the fan exhaust efficiency, overcoming the limitation of the existing method that can only obtain a single air volume parameter, and realizing a comprehensive and accurate evaluation of the fan efficiency.

[0041] 3. In terms of control and data processing, the control drive component plays a key role. The intelligent terminal is connected to the fan under test through the motor driver, which can flexibly control the rotation of the fan motor, making it convenient to study the exhaust efficiency of the fan at different speeds. At the same time, the intelligent terminal receives and processes the data transmitted by the detection component, and can quickly analyze the performance of the fan under various working conditions, which not only improves the detection efficiency, but also makes it easier for operators to adjust the detection plan in time according to the data results, optimize the detection process, and further improve the accuracy and reliability of the detection.

[0042] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the present invention.

[0044] Figure 2 This is the connection diagram for the control drive components.

[0045] Figure 3 It is a structural schematic diagram of the nozzle air volume detection plate.

[0046] Figure 4It is a static pressure-flow curve.

[0047] Figure 5 This is the power-flow curve.

[0048] Figure 6 This is the flow-efficiency curve. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] The invention provides a performance efficiency detection device and a detection method for a high-voltage electronic fan.

[0052] In this embodiment, refer to Figure 1-6 , the performance efficiency detection device of the high voltage electronic fan,

[0053] It includes a wind tunnel test device, a fan to be tested 1, a control drive component and a detection element;

[0054] The wind tunnel test device comprises an auxiliary fan 2, a wind tunnel chamber 4, an air valve 3 and a nozzle air volume detection plate 5. One end of the wind tunnel chamber 4 is connected to an air outlet pipe 6 of the auxiliary fan, and the other end is fixedly installed with a fan 1 to be tested. The auxiliary fan provides airflow for the wind tunnel chamber. The nozzle air volume detection plate is located in the wind tunnel chamber, and a plurality of nozzles 7 are arranged on the nozzle air volume detection plate.

[0055] The control drive component includes a low-voltage power supply, a high-voltage power supply, a motor driver and an intelligent terminal. The low-voltage power supply or the high-voltage power supply is connected to the fan under test to provide power for the fan under test. The intelligent terminal is connected to the fan under test through the motor driver, and the intelligent terminal is used to control the rotation of the motor of the fan under test.

[0056] The detection elements are all connected to the intelligent terminal and transmit the measured data to the intelligent terminal. The detection elements include a pressure difference sensor 12 for detecting the air pressure difference in the space on both sides of the nozzle air volume detection plate, a static pressure sensor 13 for detecting static pressure, a total pressure sensor 14 for detecting total pressure, a power meter 15 for detecting the motor power of the fan under test, and a speed sensor 16 for detecting the fan under test.

[0057] In the above technical solution, the wind tunnel test device simulates the actual airflow environment, the auxiliary fan provides airflow, the wind tunnel chamber works together with the nozzle air volume detection plate and multiple nozzles to accurately simulate the complex airflow resistance, greatly improving the fit between the test results and the actual working conditions. The control drive component realizes flexible power supply and speed control of the tested fan, the detection elements are diverse and comprehensive, and multiple parameters are synchronously detected and transmitted to the smart terminal, laying the foundation for the comprehensive and accurate evaluation of the fan exhaust efficiency, overcoming the shortcomings of existing detection technology in simulating working conditions and parameter detection, and effectively promoting the innovation of fan detection technology.

[0058] Among them, the nozzle is connected to the intelligent terminal, and the opening and closing of the nozzle is controlled by the intelligent terminal to realize the detection of different flow rates. The intelligent terminal realizes precise air flow control by controlling the auxiliary fan speed and the opening and closing degree of the air valve. A solenoid valve that can be connected to the intelligent terminal is set in the nozzle, and the solenoid valve is controlled to control the nozzle.

[0059] Among them, static pressure is the pressure of gas on the surface of an object parallel to the airflow, dynamic pressure is the pressure converted from the kinetic energy of the flowing gas, and total pressure is the sum of the two.

[0060] The smart terminal may be a computer, a mobile phone, etc., and the smart terminal and the motor driver may be connected using an adaptive interface card, such as Figure 3 shown.

[0061] Specifically, the air valve is arranged on the air outlet pipe of the auxiliary fan.

[0062] In this embodiment, an air valve is provided on the auxiliary fan outlet pipe, which can flexibly adjust the air flow and pressure entering the wind tunnel chamber. By changing the air valve opening, the air flow environment under different ventilation resistance conditions can be simulated, so that the detection device can simulate various actual working conditions more comprehensively and meticulously, and further improve the accuracy and adaptability of the detection of the exhaust efficiency of high-voltage electronic fans in different complex working scenarios.

[0063] Specifically, flow stabilizing nets 17 are provided in the wind tunnel chambers on both sides of the nozzle air volume detection plate.

[0064] In this embodiment, flow stabilization nets are arranged in the wind tunnel chambers on both sides of the nozzle air volume detection plate, which can effectively stabilize the airflow passing through the wind tunnel chamber, so that the airflow can still maintain a relatively uniform and stable state after passing through the nozzle air volume detection plate and the nozzle and other structures, reducing the interference of air flow fluctuations on the detection results, thereby improving the accuracy of the measurement data of the detection elements such as the pressure difference sensor, static pressure sensor and total pressure sensor, and further improving the reliability of the evaluation of the fan exhaust efficiency.

[0065] Specifically, the nozzle air volume detection plate is provided with nozzle mounting holes for mounting nozzles in the form of a "nine-square grid".

[0066] In this embodiment, multiple nozzles are arranged in a "nine-square grid" on the nozzle air volume detection plate, and the number of nozzles can be increased or decreased according to the actual test conditions, so as to achieve accurate distribution and regulation of airflow. This layout can form a more uniform and controllable airflow field in the wind tunnel chamber, which helps to more accurately simulate the complex distribution of airflow in the actual cooling system, enhance the detection device's simulation ability for different working conditions, and improve the accuracy and effectiveness of the detection results.

[0067] Specifically, the smart terminal has a built-in data analysis module, which can generate a static pressure-flow curve, a power-flow curve, an efficiency-flow curve and a data table of the tested fan according to the data transmitted by the detection element, and compare and analyze them with preset performance indicators.

[0068] In this embodiment, the intelligent terminal has a built-in data analysis module that can generate a variety of key curves and data tables based on the data transmitted by the detection element, and compare and analyze with the preset performance indicators. This function provides operators with intuitive and clear fan performance visualization results, which facilitates rapid evaluation of the fan's performance under different working conditions, accurately determines whether the fan meets the design requirements, greatly improves detection efficiency and scientific decision-making, and helps optimize fan design and production processes.

[0069] Specifically, the power meter is connected in series between the high-voltage power supply and the motor driver to monitor the input power of the fan under test in real time and synchronize the data to the smart terminal.

[0070] In this embodiment, the power meter is connected in series between the high-voltage power supply and the motor driver to monitor the input power of the fan under test in real time and synchronize it to the smart terminal. This ensures accurate measurement of the fan motor power, provides key parameters for comprehensive evaluation of the fan exhaust efficiency, enables operators to accurately understand the energy consumption of the fan under different working conditions, provides reliable data support for analyzing the fan energy efficiency, and helps optimize the fan energy saving.

[0071] Specifically, a sealing flange is provided at the interface between the wind tunnel chamber and the auxiliary fan and the fan under test, and a rubber gasket is embedded inside the flange to ensure air tightness.

[0072] In this embodiment, a sealing flange is provided at the interface between the wind tunnel chamber and the auxiliary fan and the fan under test, and a rubber gasket is embedded inside the flange to effectively ensure the air tightness of the device, prevent air leakage, ensure the stability of the air flow environment in the wind tunnel chamber, maintain the accuracy of the simulated working conditions, avoid deviation of the test data due to air leakage, and thus improve the detection accuracy and reliability of the entire detection device.

[0073] The present application also provides a method for testing the exhaust efficiency of a high-voltage electronic fan, comprising the following steps:

[0074] Step S1, parameter initialization:

[0075] Install the fan to be tested at the end of the wind tunnel chamber, connect the high / low voltage power supply and detection elements, and set the target speed, air valve opening and initial value of auxiliary fan speed on the intelligent terminal;

[0076] Step S2: working condition simulation and data collection:

[0077] Start the auxiliary fan and the fan under test, and simulate the static pressure environment under different system resistances by adjusting the air valve opening and the auxiliary fan speed;

[0078] The pressure difference, static pressure and total pressure values ​​on both sides of the nozzle air volume detection plate are collected in real time through the pressure difference sensor, static pressure sensor and total pressure sensor;

[0079] Synchronously record the motor power detected by the power meter and the speed data fed back by the speed sensor;

[0080] Step S3: Dynamic characteristics analysis:

[0081] The intelligent terminal calculates the actual air volume (Q) and dynamic pressure (P d) based on the collected data, where:

[0082]

[0083] (k is the nozzle flow coefficient, ΔP is the differential pressure sensor reading, and A is the total nozzle area);

[0084] P d = 0.5*ρ*V2 (ρ is air density, V is air velocity), generating static pressure-flow curve, power-efficiency curve and total pressure-speed curve;

[0085] The air flow velocity V is determined by the following formula:

[0086]

[0087] Step S4: Performance verification and optimization:

[0088] Compare the measured curve with the preset performance indicators to determine the fan's exhaust efficiency, maximum static pressure bearing capacity and energy efficiency level;

[0089] If the result does not meet the standard, adjust the motor drive parameters or fan structure and repeat steps S1-S3.

[0090] In the above technical solution, a complete closed loop is formed from parameter initialization to working condition simulation, data collection, dynamic characteristics analysis, and performance verification and optimization. By following the steps, the exhaust efficiency of high-voltage electronic fans can be fully and accurately detected. By simulating the static pressure environment under different system resistances and collecting multi-parameter data, combined with intelligent terminal analysis and calculation, key performance curves are generated, fan performance is accurately evaluated, and a scientific basis is provided for fan performance optimization.

[0091] Specifically, in step S2, by adjusting the opening and closing combination of the nine nozzles, the refined graded control of the air volume is achieved, and the change of the air volume at each level does not exceed 4-8% of the total air volume.

[0092] In step S2, the opening and closing combination of the nine nozzles is adjusted to achieve refined graded control of the air volume, and the change in air volume at each level is small. The fan performance under different air volumes can be carefully tested to obtain richer and more accurate fan performance data, providing a powerful means for in-depth research on the operating characteristics of the fan under different working conditions, which helps to more accurately evaluate the fan exhaust efficiency and optimize the fan performance.

[0093] Specifically, in step S3, the intelligent terminal calculates the fan efficiency (η) by the following formula:

[0094]

[0095] (Q is the air volume, Ps is the detection value of the static pressure sensor, and Pinput is the input power detected by the power meter).

[0096] In step S3, the intelligent terminal calculates the fan efficiency through a specific formula. This formula combines air volume, static pressure and input power, comprehensively considers the energy conversion of the fan when it is working, can accurately reflect the actual working efficiency of the fan, and provide scientific quantitative indicators for fan performance evaluation, which is convenient for comparison with preset performance indicators, judges the fan energy efficiency level, and provides a clear direction for fan energy saving improvement.

[0097] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the concept of the present invention is not limited to this invention, and any modification using the concept of the present invention will be included in the scope of protection of this patent right.

Claims

1. A performance efficiency detection device for a high-voltage electronic fan, characterized in that: It includes a wind tunnel test device, a fan to be tested, a control drive assembly and a detection element; The wind tunnel test device comprises an auxiliary fan, a wind tunnel chamber, an air valve and a nozzle air volume detection plate. One end of the wind tunnel chamber is connected to the air outlet pipe of the auxiliary fan, and the fan to be tested is fixedly installed on the other end. The auxiliary fan provides airflow for the wind tunnel chamber. The nozzle air volume detection plate is located in the wind tunnel chamber, and a plurality of nozzles are arranged on the nozzle air volume detection plate. The control drive component includes a low-voltage power supply, a high-voltage power supply, a motor driver and an intelligent terminal. The low-voltage power supply or the high-voltage power supply is connected to the fan under test to provide power for the fan under test. The intelligent terminal is connected to the fan under test through the motor driver, and the intelligent terminal is used to control the rotation of the motor of the fan under test. The detection elements are all connected to the intelligent terminal and transmit the measured data to the intelligent terminal. The detection elements include a pressure difference sensor for detecting the air pressure difference in the space on both sides of the nozzle air volume detection plate, a static pressure sensor for detecting static pressure, a total pressure sensor for detecting total pressure, a power meter for detecting the motor power of the fan under test, and a speed sensor for detecting the fan under test.

2. The performance efficiency detection device of a high-voltage electronic fan according to claim 1 is characterized in that: The air valve is arranged on the air outlet pipe of the auxiliary fan.

3. The performance efficiency detection device of a high-voltage electronic fan according to claim 1 is characterized in that: Flow stabilizing nets are arranged in the wind tunnel chambers on both sides of the nozzle air volume detection plate.

4. The performance efficiency detection device of a high-voltage electronic fan according to claim 1, characterized in that: The nozzle air volume detection plate is provided with nozzle mounting holes for mounting nozzles in the form of a "nine-square grid".

5. The performance efficiency detection device of a high-voltage electronic fan according to claim 1, characterized in that: The intelligent terminal has a built-in data analysis module, which can generate a static pressure-flow curve, a power-flow curve, an efficiency-flow curve and a data table of the tested fan according to the data transmitted by the detection element, and compare and analyze them with preset performance indicators.

6. The performance efficiency detection device of a high-voltage electronic fan according to claim 1, characterized in that: The power meter is connected in series between the high-voltage power supply and the motor driver to monitor the input power of the fan under test in real time and synchronize the data to the smart terminal.

7. The performance efficiency detection device of a high-voltage electronic fan according to claim 1, characterized in that: A sealing flange is provided at the interface between the wind tunnel chamber and the auxiliary fan and the fan under test, and a rubber gasket is embedded inside the flange to ensure air tightness.

8. A method for testing the exhaust efficiency of a high-voltage electronic fan based on the device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, parameter initialization: Install the fan to be tested at the end of the wind tunnel chamber, connect the high / low voltage power supply and detection elements, and set the target speed, air valve opening and initial value of auxiliary fan speed on the intelligent terminal; Step S2: working condition simulation and data collection: Start the auxiliary fan and the fan under test, and simulate the static pressure environment under different system resistances by adjusting the air valve opening and the auxiliary fan speed; The pressure difference, static pressure and total pressure values ​​on both sides of the nozzle air volume detection plate are collected in real time through the pressure difference sensor, static pressure sensor and total pressure sensor; Synchronously record the motor power detected by the power meter and the speed data fed back by the speed sensor; Step S3: Dynamic characteristics analysis: The intelligent terminal calculates the actual air volume (Q) and dynamic pressure (Pd) based on the collected data, where: (k is the nozzle flow coefficient, ΔP is the differential pressure sensor reading, and A is the total area of ​​the nozzle); Pd=0.5*ρ*V 2 (ρ is air density, V is air velocity), generate static pressure-flow curve 、 Power-efficiency curve and total pressure-speed curve; The air flow velocity V is determined by the following formula: Step S4: Performance verification and optimization: Compare the measured curve with the preset performance indicators to determine the fan's exhaust efficiency, maximum static pressure bearing capacity and energy efficiency level; If the result does not meet the standard, adjust the motor drive parameters or fan structure and repeat steps S1-S3.

9. The testing method according to claim 8, characterized in that: In step S2, by adjusting the opening and closing combination of the nine nozzles, the refined graded control of the air volume is achieved, and the change of the air volume at each level does not exceed 4-8% of the total air volume.

10. The testing method according to claim 8, characterized in that: In step S3, the intelligent terminal calculates the fan efficiency (η) by the following formula: (Q is the air volume, Ps is the detection value of the static pressure sensor, Pinpu t is the input power detected by the power meter).

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