The development direction of centrifugal fans is large-capacity, high-pressure, compact structure, low energy consumption, low noise, high efficiency, good plasticity, strong exhaust purification ability; generally adopt skid-mounted without foundation, full-cover low-noise design, which greatly saves installation , Basic and commissioning costs; continuous development of new types of gas valves operating under variable operating conditions, greatly improving the life of the gas valves; in product design, the application of centrifugal fan thermodynamics, dynamics calculation software and its working process simulation software, etc., to improve calculations Accuracy, through the comprehensive simulation model to predict the performance parameters of the machine under actual operating conditions, in order to improve the success rate of new product development, and strengthen mechatronics.
Adopting computer automatic control and automatic display of various operating parameters to achieve optimized energy-saving operating status, optimized online operation, abnormal display of operating parameters, alarm and protection; product design attaches importance to industrial design and environmental protection, and the appearance of centrifugal fans is more in line with environmental protection requirements. . When testing the centrifugal fan, carefully read the product manual and check whether the wiring method is consistent with the wiring diagram; carefully check whether the working voltage of the power supply to the fan meets the requirements, whether the power supply is out of phase or in the same phase, and whether the capacity of the power distribution components is Meet the requirements. When testing a two-speed fan, start at low speed and check whether the direction of rotation is correct; when starting at high speed, wait until the fan is stationary before starting to prevent reverse rotation at high speed, causing switch tripping and motor damage.
Based on the improved engineering method of centrifugal fan aerodynamic design, using our self-made aerodynamic design software and design experience, including the selection of some experience coefficients, a good performance fan aerodynamic design chart is given, and then the CFD software is used to calculate the interior of the above fan 3D turbulent flow field to get the total pressure and efficiency at a given flow. This is a critical step because it enables the fan performance to be estimated during the design phase, which was not available in the past engineering design methods. If the estimated performance is not satisfactory, change the original empirical design parameters, restart the fan engineering design, get a new wind turbine aerodynamic diagram, and then perform the three-dimensional flow field calculation to obtain the new wind turbine's estimated performance. Go to the last step. Do a prototype test to verify the estimated performance. If you are not satisfied, re-engineer the new wind turbine, calculate the estimated performance, and then perform a prototype test until you get the predicted and measured performance of the engineered wind turbine. The design of a similar and satisfactory prototype is considered complete. The entire design process is called the modern design method of centrifugal fans.
The internal structure of the centrifugal fan is complicated, the flow in the design condition is less vortex and separation, and the flow efficiency is high. The general software and numerical methods are easy to estimate the fan performance. Numerical simulation is not easy to achieve the performance of the fan; In addition, due to the limitations of CFD software and calculation technology, the calculation of the flow field of the whole machine mentioned here can only realize the numerical simulation of the coupling of the impeller and the volute, and it cannot realize the whole machine in the true sense Calculation, that is, the three-dimensional flow field calculation of the impeller-volute-air inlet-connection pipe together. We have achieved a design method that can predict the performance of the fan in the design conditions, and named it the modern design method. Therefore, this period is called the modern design method stage, and it will be a perfection of the modern design method in the future.
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