Balance-free fan blade and fan device

Abstract

The invention provides a balance-free fan blade and a fan device, and relates to the technical field of fans, the balance-free fan blade comprises an annular sealing structure and a fan blade body, the annular sealing structure is embedded in the fan blade body, and the annular sealing structure is filled with high-density liquid. The annular sealing structure is an annular hollow closed pipe with two closed ends. And the hollow closed pipe and the fan blade body are molded. After the fan runs, the mass ratio of the high-density liquid at different positions is automatically adjusted through the rotating centripetal force of the fan, and therefore the dynamic balance of the fan blades under high-speed movement is achieved. According to the fan blade, the high-density liquid is filled in the hollow closed pipe, so that when the fan runs, the mass ratio of different positions is automatically adjusted, and the fan blade automatically reaches the balance state.

Description

Technical Field

[0001] This invention relates to the field of cooling fan technology, specifically to a fan blade and fan device with an unbalanced design. Background Technology

[0002] The current market demands increasingly higher specifications for wind turbines, including performance, power, vibration, and noise levels, leading to a corresponding increase in turbine speed. In high-speed wind turbines, the blades and casing are joined using a hot-melt process. This introduces tolerances from both the blades and casing themselves, as well as from assembly. Therefore, wind turbine blades require a balancing process, and the blade design necessitates a balancing space structure to accommodate the balancing material. This design increases factory production time, limits capacity, and carries the risk of balancing material detachment. Summary of the Invention

[0003] The present invention provides a fan blade and fan device with an unbalanced design to solve the technical problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention discloses a fan blade with an unbalanced design, including an annular sealing structure and a fan blade body, wherein the annular sealing structure is embedded inside the fan blade body and the annular sealing structure is filled with a high-density liquid.

[0005] Preferably, the annular sealing structure is an annular hollow sealed tube closed at both ends.

[0006] Preferably, the hollow sealed tube and the fan blade body are molded together.

[0007] Preferably, after the fan starts running, the high-density liquid automatically adjusts the mass ratio at different positions by its own centripetal force of rotation, thereby achieving dynamic balance of the fan blades under high-speed motion.

[0008] The present invention also discloses a fan device, including the aforementioned unbalanced fan blades, and a drive device for driving the fan blades to rotate.

[0009] Preferred options also include:

[0010] Storage device: Used to store the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid; key liquid parameters include: liquid density, liquid viscosity, liquid surface tension, and liquid expansion coefficient.

[0011] Preferred options also include:

[0012] Temperature detection module 1: Used to detect the temperature of different areas on the surface of the annular sealing structure;

[0013] Correction Module 1: Based on the temperature gradient determined by the current detection cycle of Temperature Detection Module 1, correct the state coefficient weights of key liquid parameters; when the rate of change of temperature gradient is greater than the preset temperature gradient rate of change threshold, determine the current thermo-viscosity hysteresis coefficient.

[0014] Analysis Module 1: Determine the predicted equivalent temperature corresponding to the current detection cycle based on the detection results of Temperature Detection Module 1;

[0015] Analysis Module 2: Based on the predicted equivalent temperature corresponding to the current detection cycle and the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid, determine the current state coefficient of each key liquid parameter of the high-density liquid.

[0016] Prediction Module 1: Based on the historical variation trend of the state coefficient of key liquid parameters of high-density liquids, predict the current remaining lifetime of high-density liquids;

[0017] Correction Module 2: When the remaining lifespan of a high-density liquid is less than the preset lifespan, the current safety factor threshold is obtained by correcting the basic safety factor threshold based on the lifespan.

[0018] Vibration detection device: used to detect vibration information of the fan drive shaft of the fan unit;

[0019] Calculation Module 1: Used to determine the current predicted imbalance based on the detection results of the vibration detection device;

[0020] Safety factor determination module: Determines the current temperature-vibration coordinated safety factor based on the current state coefficient of each key liquid parameter of the high-density liquid and the current predicted unbalance.

[0021] Early warning module: used to issue an early warning when the temperature-vibration coordinated safety factor is greater than or equal to the current safety factor threshold.

[0022] Preferred options also include:

[0023] Speed ​​detection device: used to detect the current speed of the fan drive shaft;

[0024] Calculation Module 2: When the early warning module issues an early warning, it calculates the current target rotational speed based on the detection results of the rotational speed detection device, the current predicted imbalance, and the current temperature-vibration cooperative safety factor.

[0025] Control module: Used to control the operation of the drive device so that the actual speed of the fan drive shaft is the current target speed.

[0026] Preferred options also include:

[0027] Detection device 1: Used to detect the ambient temperature, humidity, air pressure, and air density of the environment where the fan unit is located;

[0028] Speed ​​detection device: used to detect the current speed of the fan drive shaft;

[0029] Detection device 2: Used to collect the operating current of the drive device;

[0030] Storage module: Stores a fitted curve of fan speed versus reference fan airflow.

[0031] Environment Correction Module:

[0032] The temperature correction factor is obtained based on the ratio of the air density to the standard air density;

[0033] When the ambient humidity is greater than the preset humidity, obtain the humidity-viscosity correction coefficient;

[0034] The pressure correction factor is obtained based on the ratio of actual air pressure to standard atmospheric pressure;

[0035] By combining the temperature correction factor, humidity-viscosity correction factor, and air pressure correction factor, the environmental-airflow correction factor is obtained.

[0036] Load correction module: Determines the load-airflow correction factor based on the ratio of the actual operating current to the rated current;

[0037] The coupling correction module includes:

[0038] Coupling correction unit 1: When the ambient temperature is greater than 35℃ and the ambient air pressure is less than 90 kPa, obtain the temperature and pressure-aerodynamic correction coefficient;

[0039] Coupling correction unit 2: When the actual operating current of the motor is greater than m times the rated current, obtain the overload-life decay coefficient;

[0040] Airflow calculation module: used to determine the current equivalent airflow based on the current baseline fan output airflow, environmental-airflow correction factor, load-airflow correction factor, temperature and pressure-aerodynamic correction factor, and overload-life decay factor.

[0041] Preferred options also include:

[0042] Temperature detection module 2: Used to detect the temperature of key components of the drive unit;

[0043] Thermal stress determination module: used by temperature detection module 2 to determine the thermal stress of the drive device and determine the thermal stress attenuation coefficient;

[0044] Early warning module: An early warning is issued when the ratio of the current equivalent air volume to the corresponding reference fan output air volume × thermal stress attenuation coefficient is less than a preset value;

[0045] Deviation Calculation Module: When the early warning module does not issue an early warning, calculate the deviation rate between the current equivalent air volume and the target air volume.

[0046] Scene recognition module:

[0047] In scenarios with stable airflow and an absolute deviation rate not exceeding 5%, the "constant speed and stable airflow mode" is triggered, maintaining the current speed within ±5 rpm.

[0048] In scenarios with insufficient airflow and a deviation rate of less than -10%, the "Accelerated Airflow Mode" is triggered, increasing the rotation speed according to the first preset speed gradient until the deviation rate is not less than -5%.

[0049] In scenarios with excessive airflow and a deviation rate greater than 10%, the "deceleration and airflow reduction mode" is triggered, and the rotation speed is reduced according to the second preset speed gradient until the deviation rate is no greater than 5%.

[0050] In scenarios with fluctuating airflow, where the absolute value of the deviation rate is between 5% and 10% and the fluctuation frequency is greater than once per minute, "Dynamic Airflow Adjustment Mode" is triggered.

[0051] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The hollow sealed tube and fan blade mold of this invention can prevent them from falling off and improve the reliability of the fan.

[0054] The fan blades utilize a hollow, sealed tube filled with a high-density liquid. This allows the fan to automatically adjust the mass ratio at different positions during operation, ensuring the blades reach a balanced state. (When the fan is running, the high-density liquid (such as high-density oil or molten metal) inside the hollow, sealed tube flows towards the outer side of the rotating blade (or the lighter side) due to centrifugal force.) This eliminates the need for a balancing process, reduces the labor required for blade balancing, and significantly increases the factory's production capacity.

[0055] Since the fan blades do not require balancing, the loss of balancing material and other factors improve the overall quality of the fan. Attached Figure Description

[0056] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0057] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0058] Figure 2 This is a schematic diagram of the annular sealing structure of the present invention;

[0059] Figure 3 This is a top view of the present invention;

[0060] Figure 4 For the present invention Figure 3 Sectional view of AA;

[0061] Figure 5 This is a schematic diagram of the structure of a fan blade in the prior art.

[0062] In the diagram: 1. Fan blade body; 2. Annular sealing structure. Detailed Implementation

[0063] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0064] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0065] In the existing technology, most fan blades need to be rebalanced to meet the G6.3 standard and the fan vibration requirements. The balancing mud used for rebalancing is at risk of falling off.

[0066] The present invention provides the following embodiments:

[0067] Example 1: This embodiment of the invention provides a fan blade with an unbalanced design, such as... Figures 1-4 As shown, it includes an annular sealing structure 2 and a fan blade body 1. The annular sealing structure 2 is embedded inside the fan blade body 1, and the annular sealing structure 2 is filled with a high-density liquid.

[0068] Preferably, the annular sealing structure 2 is an annular hollow sealed tube closed at both ends.

[0069] Preferably, the hollow sealed tube and the fan blade body 1 are molded together.

[0070] Preferably, after the fan starts running, the high-density liquid automatically adjusts the mass ratio at different positions by its own centripetal force of rotation, thereby achieving dynamic balance of the fan blades under high-speed motion.

[0071] This invention also discloses a fan device, including the aforementioned unbalanced fan blades, and a drive device for driving the fan blades to rotate. The drive device of this invention is prior art.

[0072] 1. Rotor imbalance is caused by the eccentricity of the rotor components. When the rotating body rotates, the centrifugal inertial forces generated by each tiny particle on it cannot cancel each other out, thus generating unbalanced centrifugal forces, which results in dynamic imbalance.

[0073] 2. The unbalanced fan blade design in this paper involves embedding a hollow, sealed tube inside the fan blades, and filling the tube with a high-density liquid. When the fan is running, the centripetal force of its rotation causes the high-density liquid to automatically adjust the mass ratio at different positions, thus achieving dynamic balance of the fan blades under high-speed motion.

[0074] 3. The hollow sealed tube filled with high-density liquid will be embedded in the fan blade mold, so that the hollow sealed tube and the fan blade are integrally formed. This reduces the assembly process of the hollow sealed tube and ensures that it will not fall off during high-speed operation, thus guaranteeing reliability.

[0075] This invention introduces a novel structure: a ring-shaped sealing structure is embedded inside the fan blade body 1. A high-density liquid is filled within the hollow, sealed tube. When the fan is running, the high-density liquid automatically adjusts the mass ratio at different positions due to the fan's own rotational centripetal force, thereby achieving dynamic balance of the fan blades under high-speed motion. This saves on balancing costs and improves quality control.

[0076] The beneficial effects of the above technical solution are as follows:

[0077] The hollow sealed tube and fan blade mold of this invention can prevent them from falling off and improve the reliability of the fan.

[0078] The fan blades utilize a hollow, sealed tube filled with a high-density liquid. This allows the fan to automatically adjust the mass ratio at different positions during operation, ensuring the blades reach a balanced state. (When the fan is running, the high-density liquid (such as high-density oil or molten metal) inside the hollow, sealed tube flows towards the outer side of the rotating blade (or the lighter side) due to centrifugal force.) This eliminates the need for a balancing process, reduces the labor required for blade balancing, and significantly increases the factory's production capacity.

[0079] Since the fan blades do not require balancing, the loss of balancing material and other factors improve the overall quality of the fan.

[0080] Example 2, based on Example 1, further includes:

[0081] Storage device: Used to store the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid; key liquid parameters include: liquid density, liquid viscosity, liquid surface tension, and liquid expansion coefficient.

[0082] Temperature detection module 1: Used to detect the temperature of different areas on the surface of the annular sealing structure;

[0083] Correction Module 1: Based on the temperature gradient determined by the current detection cycle of Temperature Detection Module 1, correct the state coefficient weights of key liquid parameters; when the rate of change of temperature gradient is greater than the preset temperature gradient rate of change threshold, determine the current thermo-viscosity hysteresis coefficient.

[0084] Analysis Module 1: Determine the predicted equivalent temperature corresponding to the current detection cycle based on the detection results of Temperature Detection Module 1;

[0085] Analysis Module 2: Based on the predicted equivalent temperature corresponding to the current detection cycle and the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid, determine the current state coefficient of each key liquid parameter of the high-density liquid.

[0086] Prediction Module 1: Based on the historical variation trend of the state coefficient of key liquid parameters of high-density liquids, predict the current remaining lifetime of high-density liquids;

[0087] Correction Module 2: When the remaining lifespan of a high-density liquid is less than the preset lifespan, the current safety factor threshold is obtained by correcting the basic safety factor threshold based on the lifespan.

[0088] Vibration detection device: used to detect vibration information of the fan drive shaft of the fan unit;

[0089] Calculation Module 1: Used to determine the current predicted imbalance based on the detection results of the vibration detection device;

[0090] Safety factor determination module: Determines the current temperature-vibration coordinated safety factor based on the current state coefficient of each key liquid parameter of the high-density liquid and the current predicted unbalance.

[0091] Early warning module: used to issue an early warning when the temperature-vibration coordinated safety factor is greater than or equal to the current safety factor threshold.

[0092] Also includes:

[0093] Speed ​​detection device: used to detect the current speed of the fan drive shaft;

[0094] Calculation Module 2: When the early warning module issues an early warning, it calculates the current target rotational speed based on the detection results of the rotational speed detection device, the current predicted imbalance, and the current temperature-vibration cooperative safety factor.

[0095] Control module: Used to control the operation of the drive device so that the actual speed of the fan drive shaft is the current target speed.

[0096] The above curves were determined through experimental testing before the fan device was applied:

[0097] Equipment preparation: High-precision densitometers, viscometers (such as rotational viscometers), surface tension meters (such as platinum plate surface tension meters), thermal expansion meters, and other equipment are used to accurately measure the density, viscosity, surface tension, and expansion coefficient of liquids at different temperatures.

[0098] Temperature gradient test: Set a series of temperature points (covering the temperature range that the fan blades may operate in, such as -20℃ to 80℃), and select a temperature according to the temperature gradient. At each selected temperature, use the corresponding instrument to test the density, viscosity, surface tension, and coefficient of thermal expansion of the high-density liquid. For example, use a hydrometer to measure the liquid density at temperatures of 25℃, 30℃, and 35℃, and record the different temperature-parameter data.

[0099] Data Fitting: Curve Fitting Tools: Using data analysis software such as Origin and Matlab, import the test data for each key parameter (density, viscosity, etc.) and temperature. Plot temperature on the x-axis and the key parameter on the y-axis, and use a suitable fitting function (such as polynomial fitting, exponential fitting, etc., selected according to the data distribution characteristics) to obtain the temperature-key liquid parameter fitting curve. For example, the viscosity of a liquid may change exponentially with temperature, so an exponential function is used for fitting to obtain the viscosity-temperature fitting curve.

[0100] Storage and Input: Storage Format: Each fitted curve (temperature-density, temperature-viscosity, etc.) is entered into a storage device as a data file (such as CSV format) or model parameters (such as coefficients of the fitted function). Simultaneously, an index is created to facilitate subsequent lookup of corresponding key parameters based on temperature, or reverse lookup of temperature based on key parameters, and other application scenarios.

[0101] The coefficient of thermal expansion of a liquid, usually referring to the coefficient of volumetric expansion, is defined as the relative change in liquid volume caused by a unit change in temperature under constant pressure.

[0102] First, the average temperature of each region on the surface of the annular sealing structure is obtained; multiple temperature measurements are performed in each detection cycle; the interval between detection cycles is determined based on the maximum detection value of the current temperature detection module one using a mapping table.

[0103] The current temperature gradient of the neighboring regions = the absolute difference in the average temperature of the current neighboring regions ÷ the distance between the centers of the current neighboring regions;

[0104] The rate of change of the temperature gradient in the current neighboring region = (the temperature gradient determined by the current detection in the current neighboring region - the temperature gradient determined by the previous detection in the current neighboring region) ÷ the time interval between the two temperature detections in the current neighboring region;

[0105] First, take the first average value of the temperature gradient for each adjacent region group (the average value of the actual temperature gradient for each adjacent region group is denoted as the first average value, used to distinguish it from subsequent names). Then, take the arithmetic mean W of all the first average values ​​to correct the state coefficient weights of the key liquid parameters.

[0106]

[0107] K i0 K represents the baseline state coefficient weight for the i-th key liquid parameter; i θ represents the corrected state coefficient weight for the i-th key liquid parameter; W0 is the baseline value corresponding to W (the value of W corresponding to the liquid parameter under the baseline operating condition); i Let K be the temperature sensitivity coefficient of the i-th critical liquid parameter (reflecting the sensitivity of the i-th liquid parameter to temperature changes, with a value ranging from 0.01 to 0.1); all K i The sum of all K is 1; i0 The sum is 1; a single K i0 The value ranges from 0.1 to 0.5; a single K i The value ranges from 0.05 to 0.6;

[0108] Take the maximum gradient change rate of each adjacent region group, and then take the maximum value U of the maximum gradient change rates of all adjacent region groups; the preset temperature gradient change rate threshold is U0 (the critical value for determining whether "thermal-viscosity hysteresis" is triggered; if this value is exceeded, the hysteresis effect is considered significant).

[0109] Current lag coefficient

[0110] H0 is the baseline lag coefficient (the lag coefficient under the baseline operating condition (no significant lag), which serves as the basis for correction); e is the natural constant; μ0 is the lag sensitivity coefficient (reflecting the system's sensitivity to lag effects; the larger μ0 is, the larger the lag coefficient will be even with a small gradient rate of change); obtained from experimental fitting, with a value range of 0.2-0.8).

[0111] T = ∈ *t *a + T0;

[0112] T is the predicted equivalent temperature corresponding to the current detection cycle; T0 is the maximum temperature of the surface of the annular sealing structure detected at the end of the current detection cycle; first, the maximum temperature change rate (in °C / min) of each surface area of ​​the annular sealing structure in the current detection cycle is obtained, and then the maximum value of the maximum temperature change rate of all surface areas is taken, i.e., a; t is the theoretical time from the end of the temperature detection in the current detection cycle to the speed adjustment (the time from the end of the temperature detection in the current detection cycle to the start of control by the control module + the time from the start of control by the control module to the speed adjustment to the target speed); ∈ is the temperature change rate correction coefficient (in the test bench to simulate real working conditions, collect T0, a, t and actual equivalent temperature of multiple detection cycles, fit the formula using the least squares method, solve for the optimal ∈, and also obtain the boundary value in extreme working conditions).

[0113] First, determine the current parameter value of the predicted equivalent temperature corresponding to the current detection cycle in the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid; the current parameter value of the other key liquid parameters besides liquid viscosity is the theoretical current parameter value;

[0114] The theoretical current parameter value of liquid viscosity = the current parameter value of liquid viscosity (1 + H × hysteresis-viscosity correction factor); the hysteresis-viscosity correction factor is an experimentally calibrated correction factor that reflects the degree of influence of hysteresis on viscosity; H is the current hysteresis coefficient;

[0115] The current state coefficient of the current critical liquid parameter = the theoretical current value of the current critical liquid parameter ÷ the reference value of the current critical liquid parameter;

[0116] The remaining lifetime is calculated only if the current state coefficient of the current critical liquid parameter is within the corresponding allowable range (if the current state coefficient of the current critical liquid parameter is not within the corresponding allowable range, the remaining lifetime is 0). First, the remaining lifetime is determined based on the state coefficient of each critical liquid parameter.

[0117] The remaining lifetime corresponding to the current critical liquid parameter state coefficient =

[0118]

[0119] Where ln is the natural logarithm, and S1 is the nearest state coefficient threshold for the current key liquid parameter (which can be the maximum state coefficient threshold S). max Or minimum state coefficient threshold S minEach key liquid parameter corresponds to an overall coefficient allowable range [minimum state coefficient threshold, maximum state coefficient threshold]; S is the current state coefficient of the current key liquid parameter; σ is the rate at which S approaches S1 (which can be the decay rate or growth rate fitted based on historical trends, S approaches the minimum state coefficient threshold, and σ is the decay rate).

[0120] S max -S is less than or equal to SS min Then S1 is S max ;

[0121] S max -S is greater than SS min Then S1 is S min ;

[0122] The minimum of the above remaining lifespans is selected as the current remaining lifespan F of the high-density liquid; F0 is the preset lifespan; the preset lifespan is the theoretical service life benchmark set in advance for the liquid under ideal working conditions (such as standard environment, no abnormal disturbance), and is mainly used for deterioration judgment.

[0123] Current security threshold p is the life-safety factor correction factor (based on test calibration, with a value greater than 0 and less than 0.5); Y0 is the baseline safety factor threshold (under baseline operating conditions, initial use of high-density liquid);

[0124] The current predicted imbalance R = amplitude detected by the vibration detection device × mass of the fan drive shaft × current angular velocity of the fan drive shaft 2 ×Unbalance correction coefficient;

[0125] The imbalance correction factor can be based on experimental calibration (based on the amplitude detected by the vibration detection device × the mass of the fan drive shaft × the current angular velocity of the fan drive shaft). 2 The determined imbalance amount and the correction factor between the actual imbalance amount; Actual imbalance amount = Amplitude detected by vibration detection device × Mass of fan drive shaft × Current angular velocity of fan drive shaft 2 Determined imbalance amount × imbalance amount correction factor;

[0126] First, calculate the absolute difference between the current state coefficient of each critical liquid parameter and its corresponding reference state coefficient. Then, divide the corresponding absolute difference by the corresponding reference state coefficient to obtain the deviation coefficient of each critical liquid parameter. Take the maximum value θ of the deviation coefficients of all critical liquid parameters.

[0127] Current temperature-vibration coordinated safety factor

[0128] G0 is the reference temperature-vibration coordinated safety factor; e is the natural constant; γ is the current predicted imbalance divided by the maximum allowable imbalance; τ1 and τ2 are the safety factor correction weights for the maximum deviation coefficients of all key liquid parameters (controlling the influence of "liquid parameter deviation from the reference" on the safety factor) and the safety factor correction weights for γ (controlling the influence of "vibration predicted imbalance" on the safety factor), respectively; historical equipment failure data can be statistically analyzed to determine the proportion of failures caused by abnormal key liquid parameters (such as drastic viscosity changes or excessive density) and vibration imbalance (such as shaft imbalance). If the proportion of liquid parameter-related failures is high, increase τ1; if the proportion of vibration-related failures is high, increase τ2.

[0129]

[0130] n is the current target speed; n0 is the current speed detection result; R is the current predicted imbalance; R0 is the maximum allowable imbalance (vibration imbalance threshold for safe operation of the equipment); The speed regulation coefficient (values ​​greater than 0 and less than 1); controls the sensitivity of speed regulation; calibrated based on equipment operation stability tests (values...). (The adjustment range and response speed need to be balanced); the current safety factor threshold Y; the current temperature-vibration coordinated safety factor G;

[0131] The beneficial effects of the above technical solution are as follows:

[0132] It covers density, viscosity, surface tension, and coefficient of expansion, constructing a "digital twin" of high-density liquids. It not only checks whether a single parameter exceeds the standard, but also analyzes the correlation and degradation between parameters (such as density anomalies accompanied by a sudden drop in surface tension, identifying micro-leakage or contamination intrusion), and detects the risk of quality changes in high-density liquids in advance.

[0133] Considering temperature gradient changes during equipment start-up and shutdown, and load fluctuations, correct for "false degradation" of high-density liquid parameters (such as a sudden increase in viscosity due to short-term high temperature, which is actually a temporary fluctuation with temperature lag). Ensure that condition assessments accurately reflect the true physical properties of high-density liquids, avoiding excessive maintenance that "misjudges normal fluctuations as failures."

[0134] Select a reference threshold based on the actual distance between the parameter and its upper and lower limits (focus on the upper limit if it's close to the upper limit, and on the lower limit if it's close to the lower limit) to solve the problem of "blindly selecting a threshold when the parameter is in the middle of the range". For example, when the coolant viscosity is close to the upper limit, use the upper limit threshold to calculate the lifespan, focusing on "the risk of continued viscosity increase"; if the viscosity is close to the lower limit, use the lower limit threshold to focus on "the risk of high-density fluid capacity degradation".

[0135] By combining historical data with parameters to measure the rate of degradation (such as viscosity increasing faster due to contamination), the remaining lifetime prediction not only calculates the "remaining space from the current state to the threshold" but also the "lifetime consumption after accelerated degradation." For example, if the viscosity initially increases by 0.1 per month and later increases by 0.5 per month due to contamination, dynamic fitting can provide early warning of the risk of a "cliff-like shortening of lifetime."

[0136] When the remaining lifespan of a high-density liquid is lower than the ideal value, the equipment safety margin is actively reduced. For example, if the coolant has only 30% of its remaining lifespan left, the equipment automatically reduces the load by 20%, forcing a "shorter lifespan, smaller safety margin" approach to prevent overheating and wear failures caused by "insufficient lifespan but full load operation" from the source.

[0137] High-density liquid deterioration → triggering a decrease in the temperature-vibration synergistic safety factor → automatic reduction of equipment speed (e.g., fan speed) → reducing equipment heat generation and vibration. This forms a closed loop of "poor high-density liquid condition → proactive load reduction → reducing deterioration triggers," upgrading from "passive alarm shutdown" to "proactive intervention to ensure safety," reducing the impact of sudden failures on production / use.

[0138] Example 3, based on Example 1 or 2, further includes:

[0139] Detection device 1: Used to detect the ambient temperature, humidity, air pressure, and air density of the environment where the fan unit is located;

[0140] Speed ​​detection device: used to detect the current speed of the fan drive shaft;

[0141] Detection device 2: Used to collect the operating current of the drive device;

[0142] Storage module: Stores a fitted curve of fan speed versus reference fan airflow.

[0143] Environment Correction Module:

[0144] The temperature correction factor is obtained based on the ratio of the air density to the standard air density;

[0145] When the ambient humidity is greater than the preset humidity, obtain the humidity-viscosity correction coefficient;

[0146] The pressure correction factor is obtained based on the ratio of actual air pressure to standard atmospheric pressure;

[0147] An environmental-airflow correction factor that combines temperature correction factor, humidity-viscosity correction factor, and air pressure correction factor;

[0148] Load correction module: Determines the load-airflow correction factor based on the ratio of the actual operating current to the rated current;

[0149] The coupling correction module includes:

[0150] Coupling correction unit 1: When the ambient temperature is greater than 35℃ and the ambient air pressure is less than 90 kPa, obtain the temperature and pressure-aerodynamic correction coefficient;

[0151] Coupling correction unit 2: When the actual operating current of the motor is greater than m times the rated current, obtain the overload-life decay coefficient;

[0152] Airflow calculation module: used to determine the current equivalent airflow based on the current baseline fan output airflow, environmental-airflow correction factor, load-airflow correction factor, temperature and pressure-aerodynamic correction factor, and overload-life decay factor.

[0153] Also includes:

[0154] Temperature detection module 2: Used to detect the temperature of key components of the drive unit;

[0155] Thermal stress determination module: used by temperature detection module 2 to determine the thermal stress of the drive device and determine the thermal stress attenuation coefficient;

[0156] Early warning module: An early warning is issued when the ratio of the current equivalent air volume to the corresponding reference fan output air volume × thermal stress attenuation coefficient is less than a preset value;

[0157] Deviation Calculation Module: When the early warning module does not issue an early warning, calculate the deviation rate between the current equivalent air volume and the target air volume.

[0158] Scene recognition module:

[0159] In scenarios with stable airflow and an absolute deviation rate not exceeding 5%, the "constant speed and stable airflow mode" is triggered, maintaining the current speed within ±5 rpm.

[0160] In scenarios with insufficient airflow and a deviation rate of less than -10%, the "Accelerated Airflow Mode" is triggered, increasing the rotation speed according to the first preset speed gradient until the deviation rate is not less than -5%.

[0161] In scenarios with excessive airflow and a deviation rate greater than 10%, the "deceleration and airflow reduction mode" is triggered, and the rotation speed is reduced according to the second preset speed gradient until the deviation rate is no greater than 5%.

[0162] In scenarios with fluctuating airflow, where the absolute value of the deviation rate is between 5% and 10% and the fluctuation frequency is greater than once per minute, "Dynamic Airflow Adjustment Mode" is triggered.

[0163] The fan drive mechanism is prior art, as is its drive shaft;

[0164] Thermal stress of the current critical component of the drive unit = (maximum value of temperature detected by the temperature detection module of the current critical component of the drive unit - reference temperature of the current critical component of the drive unit) × elastic modulus of the current critical component of the drive unit × coefficient of linear expansion of the current critical component of the drive unit;

[0165] Reference temperature (pre-calibrated initial / design reference temperature of the component, such as room temperature 25°C or assembly ambient temperature).

[0166] The maximum value of the thermal stress of all key components of the drive unit is taken as the thermal stress of the drive unit.

[0167] Thermal stress attenuation coefficient = 1 - (number of thermal stress cycles × attenuation adjustment coefficient × (thermal stress of the drive device ÷ allowable thermal stress - 1)); the attenuation adjustment coefficient is greater than 0 and less than 0.2, and is determined by experimental calibration.

[0168] Temperature correction factor = ratio of actual air density to standard air density × (actual ambient temperature ÷ reference ambient temperature); the ratio of actual air density to standard air density is the same as the ratio of actual air density ÷ standard air density.

[0169] Humidity-viscosity correction factor = 1 - (humidity-viscosity compensation factor) × [(actual humidity - preset humidity) ÷ preset humidity];

[0170] The humidity-viscosity compensation coefficient is a core parameter for quantifying the degree of influence of humidity on air viscosity. It corrects for fluctuations in air viscosity caused by changes in humidity, thereby compensating for deviations in airflow and power transmission efficiency of drive devices (such as fans). Its physical meaning is: the "compensation weight" for changes in air viscosity affecting system performance when humidity deviates from a preset value, directly determining the calculation accuracy of the humidity-viscosity correction coefficient. It can be obtained based on experiments or an empirical database, with a value greater than 0.05 and less than 0.3.

[0171] Pressure correction factor = the ratio of actual air pressure to standard atmospheric pressure;

[0172] Environmental-airflow correction factor = Temperature correction factor × Air pressure correction factor × Humidity-viscosity correction factor;

[0173] Load-airflow correction factor = 1 - Current-corresponding adjustment factor × Ratio of operating current to rated current 2 ;

[0174] The adjustment coefficient corresponding to the current (with a value greater than 0 and less than 0.2) is a compensation parameter that quantifies the "motor current → airflow deviation," and its core function is:

[0175] The ratio of operating current to rated current is converted into the degree of influence of load on air volume (the larger the current, the heavier the load, but the air volume gain is not linear and needs to be corrected with an adjustment coefficient).

[0176] This reflects the implicit impact of "motor efficiency, heat generation, and mechanical losses" on airflow (such as decreased motor efficiency and lower airflow gain than theoretical value under overload).

[0177] The coupling correction module includes:

[0178] Coupling correction unit 1: When the ambient temperature is greater than 35℃ and the ambient air pressure is less than 90 kPa, obtain the temperature and pressure-aerodynamic correction coefficient;

[0179]

[0180] f is the current temperature-pressure-aerodynamic correction factor; T is the current ambient temperature; P is the current ambient air pressure; T0 is the standard thermodynamic temperature; P0 is the standard atmospheric pressure;

[0181] Coupling correction unit 2: When the actual operating current of the motor is greater than m times the rated current, obtain the overload-life decay coefficient;

[0182]

[0183] ∝ is the current decay index; I is the actual operating current; I0 ​​is the rated current; m is the overload judgment threshold multiple, which represents the "critical multiple" by which the motor's operating current exceeds the rated current. m is determined by the motor's design overload capacity and the safety requirements of the application scenario.

[0184] ∝ is the "sensitivity coefficient" of current overload to life decay, reflecting the rate of life decay with "overload multiple", which needs to be fitted by accelerated life test;

[0185] Current equivalent air volume = reference fan output air volume × environment - air volume correction factor × load - air volume correction factor × temperature and pressure - aerodynamic correction factor × overload - lifespan degradation factor;

[0186] Deviation calculation module:

[0187] Deviation rate - (predicted air volume - target air volume) ÷ target air volume;

[0188] Fluctuation Scenario Coupling Correction Unit: When in a fluctuating airflow scenario (the absolute value of the deviation rate between the predicted airflow and the target airflow is between 5% and 10%, and the fluctuation frequency is greater than 1 time / minute), the fluctuation-inertia correction coefficient is obtained (experimental calibration: the fluctuation-inertia correction coefficient is 0.95), and the slope of the rotation speed change is reduced to no more than 80 revolutions / minute to suppress the airflow overshoot problem.

[0189] Scene recognition subunit:

[0190] In scenarios with stable airflow (absolute deviation rate not exceeding 5%): "Constant speed and stable airflow mode" is triggered to maintain the current speed within ±5 rpm.

[0191] Insufficient airflow scenario (deviation rate less than -10%): Trigger "Accelerated airflow mode", increase the speed according to the first preset speed gradient until the deviation rate is not less than -5%;

[0192] Excessive airflow scenario (deviation rate greater than 10%): Trigger "Deceleration and Airflow Reduction Mode", reduce the speed according to the second preset speed gradient until the deviation rate is no greater than 5%;

[0193] In the scenario of air volume fluctuation (absolute deviation rate between 5% and 10%, and fluctuation frequency greater than 1 time / minute): the "dynamic air adjustment mode" is triggered, the midpoint speed of the air volume fluctuation range is multiplied by the fluctuation-inertia correction coefficient, and the slope of the speed change is controlled to not exceed 80 revolutions / minute.

[0194] To address the issues of air inertia and motor response lag caused by sudden changes in fan speed, a fluctuation-inertia correction coefficient (recommended calibration value 0.95) is used to limit the slope of speed change and prevent airflow overshoot. The actual speed change is calculated as: actual speed change ÷ theoretical speed change without correction.

[0195] The beneficial effects of the above technical solution are as follows:

[0196] The solution reduces the airflow calculation error to ≤3% through four corrections: environmental factors (temperature / humidity / pressure), load (current), aerodynamic characteristics (temperature-pressure coupling), and lifespan degradation (overload).

[0197] By introducing a fluctuation-inertia correction coefficient (limiting the slope of speed change to ≤80 rpm), the problem of "sudden change in air volume → system oscillation" in traditional control is solved.

[0198] The overload-life degradation coefficient (exponential model) quantifies the motor's life loss in real time, dynamically reducing the derating at the initial stage of overload (1.1-1.3 times the rated current) to avoid "small overloads accumulating into major failures".

[0199] The thermal stress attenuation coefficient is correlated with the number of thermal cycles and structural damage, providing an early warning of potential problems such as blade deformation and shaft loosening 30 days in advance (through the quantification of temperature gradient → thermal stress → damage).

[0200] Dynamic speed adjustment is combined with four scenarios: stable / insufficient / excessive / fluctuating airflow.

[0201] For scenarios with stable airflow: maintain the speed at ±5 rpm to avoid wasting energy through "meaningless speed adjustment";

[0202] In scenarios with excessive airflow: reduce the speed to a deviation rate of ≤5% to reduce energy consumption due to "excessive heat dissipation".

[0203] The environmental-load correction factor compensates for the impact of air density and motor efficiency degradation on airflow, ensuring that the fan always operates in the high-efficiency range.

[0204] The coupled correction unit (temperature and pressure-aerodynamic correction) is specifically designed to handle high temperature (>35℃) + low pressure (<90kPa) scenarios, ensuring that the air volume calculation error is ≤5% under extreme conditions.

[0205] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A fan blade with an unbalanced design, characterized in that: It includes an annular sealing structure (2) and a fan blade body (1), with the annular sealing structure (2) embedded inside the fan blade body (1), and the annular sealing structure (2) filled with a high-density liquid.

2. The fan blade with an unbalanced design according to claim 1, characterized in that: The annular sealing structure (2) is an annular hollow sealed tube with both ends closed.

3. The fan blade with an unbalanced design according to claim 1, characterized in that: Hollow sealed tube and fan blade body (1) mold forming.

4. The fan blade with an unbalanced design according to claim 1, characterized in that: After the fan starts running, the high-density liquid automatically adjusts the mass ratio at different positions due to its own centripetal force, thereby achieving dynamic balance of the fan blades under high-speed motion.

5. A fan device, characterized in that: The fan blade includes an unbalanced design as described in any one of claims 1-4, and further includes a drive device for driving the fan blade to rotate.

6. A fan device according to claim 5, characterized in that: Also includes: Storage device: Used to store the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid; Key liquid parameters include: liquid density, liquid viscosity, liquid surface tension, and liquid expansion coefficient.

7. A fan device according to claim 6, characterized in that: Also includes: Temperature detection module 1: Used to detect the temperature of different areas on the surface of the annular sealing structure; Correction Module 1: Based on the temperature gradient determined by Temperature Detection Module 1 in the current detection cycle, correct the state coefficient weights of key liquid parameters; When the rate of change of temperature gradient is greater than the preset threshold for the rate of change of temperature gradient, the current thermal-viscosity hysteresis coefficient is determined. Analysis Module 1: Determine the predicted equivalent temperature corresponding to the current detection cycle based on the detection results of Temperature Detection Module 1; Analysis Module 2: Based on the predicted equivalent temperature corresponding to the current detection cycle and the high-density liquid temperature-key liquid parameter fitting curve corresponding to each key liquid parameter of the high-density liquid, determine the current state coefficient of each key liquid parameter of the high-density liquid. Prediction Module 1: Based on the historical variation trend of the state coefficient of key liquid parameters of high-density liquids, predict the current remaining lifetime of high-density liquids; Correction Module 2: When the remaining lifespan of a high-density liquid is less than the preset lifespan, the current safety factor threshold is obtained by correcting the basic safety factor threshold based on the lifespan. Vibration detection device: used to detect vibration information of the fan drive shaft of the fan unit; Calculation Module 1: Used to determine the current predicted imbalance based on the detection results of the vibration detection device; Safety factor determination module: Determines the current temperature-vibration coordinated safety factor based on the current state coefficient of each key liquid parameter of the high-density liquid and the current predicted unbalance. Early warning module: used to issue an early warning when the temperature-vibration coordinated safety factor is greater than or equal to the current safety factor threshold.

8. A fan device according to claim 7, characterized in that: Also includes: Speed ​​detection device: used to detect the current speed of the fan drive shaft; Calculation Module 2: When the early warning module issues an early warning, it calculates the current target rotational speed based on the detection results of the rotational speed detection device, the current predicted imbalance, and the current temperature-vibration cooperative safety factor. Control module: Used to control the operation of the drive device so that the actual speed of the fan drive shaft is the current target speed.

9. A fan device according to claim 5, characterized in that: Also includes: Detection device 1: Used to detect the ambient temperature, humidity, air pressure, and air density of the environment where the fan unit is located; Speed ​​detection device: used to detect the current speed of the fan drive shaft; Detection device 2: Used to collect the operating current of the drive device; Storage module: Stores a fitted curve of fan speed versus reference fan airflow. Environment Correction Module: The temperature correction factor is obtained based on the ratio of the air density to the standard air density; When the ambient humidity is greater than the preset humidity, obtain the humidity-viscosity correction coefficient; The pressure correction factor is obtained based on the ratio of actual air pressure to standard atmospheric pressure; By combining the temperature correction factor, humidity-viscosity correction factor, and air pressure correction factor, the environmental-airflow correction factor is obtained. Load correction module: Determines the load-airflow correction factor based on the ratio of the actual operating current to the rated current; The coupling correction module includes: Coupling correction unit 1: When the ambient temperature is greater than 35℃ and the ambient air pressure is less than 90 kPa, obtain the temperature and pressure-aerodynamic correction coefficient; Coupling correction unit 2: When the actual operating current of the motor is greater than m times the rated current, obtain the overload-life decay coefficient; Airflow calculation module: used to determine the current equivalent airflow based on the current baseline fan output airflow, environmental-airflow correction factor, load-airflow correction factor, temperature and pressure-aerodynamic correction factor, and overload-life decay factor.

10. A fan device according to claim 9, characterized in that: Also includes: Temperature detection module 2: Used to detect the temperature of key components of the drive unit; Thermal stress determination module: used to determine the thermal stress of the drive device based on the detection results of temperature detection module 2, and to determine the thermal stress attenuation coefficient; Early warning module: An early warning is issued when the ratio of the current equivalent air volume to the corresponding reference fan output air volume × thermal stress attenuation coefficient is less than a preset value; Deviation Calculation Module: When the early warning module does not issue an early warning, calculate the deviation rate between the current equivalent air volume and the target air volume; Scene recognition module: In scenarios with stable airflow and an absolute deviation rate not exceeding 5%, the "constant speed and stable airflow mode" is triggered, maintaining the current speed within ±5 rpm. In scenarios with insufficient airflow and a deviation rate of less than -10%, the "Accelerated Airflow Mode" is triggered, increasing the rotation speed according to the first preset speed gradient until the deviation rate is not less than -5%. In scenarios with excessive airflow and a deviation rate greater than 10%, the "deceleration and airflow reduction mode" is triggered, and the rotation speed is reduced according to the second preset speed gradient until the deviation rate is no greater than 5%. In scenarios with fluctuating airflow, the absolute value of the deviation rate is between 5% and 10%, and the fluctuation frequency is greater than 1 time per minute: Trigger "Dynamic Airflow Adjustment Mode".

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