When the speed of stainless steel axial flow fan changes at + 20%, it is necessary to select and discuss the energy saving and environmental protection technology options of the fans, so as to standardize the technological route of the relevant control measures, speed up the progress of energy conservation and emission reduction, and promote the development of energy conservation and environmental protection work in a sustainable and healthy direction in China. At present, most of the noise control measures are based on passive noise reduction, that is, the air muffler is used at the inlet and outlet of the fan, and the sound insulation room is adopted in the surrounding body of the blower and the motor to reduce the propagation amplitude of the fan.
Efficiency can be approximated to see no change. Because the flow rate is very high, the composite tube and power are directly proportional to the primary and the three power of the revolution. Therefore, the variable speed method is used to reduce the power and reduce the power. Compared with the regulating valve, it has obvious power saving effect. At present, some industrial developed countries in the world are developing and applying new equipment for variable speed regulation.
46% of stainless steel is now available. Axial fan Changed to dual speed or variable speed drive. In recent years, variable speed drive has been used as the main way to save energy in China. The State Planning Commission and the economic and Trade Commission have listed variable speed transmission as one of the major energy saving measures in the country. According to data statistics, a fan with a low efficiency transmission can save 10% to 25% of electricity. Generally speaking, a highly efficient transmission can save electricity 25% to 40%.. The aerodynamic noise of a fan is a dipole source. Because the sound power of the dipole source is proportional to the 6 power of the flow velocity, it is proportional to the 2 times of the fan size. The variable speed regulating flow reduces the alternating force between the impeller outlet air flow and the worm tongue and the change of airflow density caused by the alternating force generated by the vortex shedding on the surface, thus greatly reducing the noise of the fan under the actual working condition. Compared with adjusting the valve to adjust the air volume, adjusting the speed and adjusting the air volume does not increase the resistance of the pipe network, nor does it increase the sound power of the noise source. Two, lowering the rotational speed not only reduces the power of the fan, but also reduces the sound power of the noise source.
Tags: Axial fan Exhaust fan Smoke exhausting fan